CN113464213B - Steam-driven water feed pump control method, module and system for thermal generator set - Google Patents
Steam-driven water feed pump control method, module and system for thermal generator set Download PDFInfo
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- CN113464213B CN113464213B CN202110836081.9A CN202110836081A CN113464213B CN 113464213 B CN113464213 B CN 113464213B CN 202110836081 A CN202110836081 A CN 202110836081A CN 113464213 B CN113464213 B CN 113464213B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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- F01D15/08—Adaptations for driving, or combinations with, pumps
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Abstract
A steam-driven water feed pump control method, a steam-driven water feed pump control module and a steam-driven water feed pump control system for a thermal generator set are disclosed, wherein the steam-driven water feed pump control method for the thermal generator set comprises the following steps: confirming the low-pressure state of the steam turbine of the low-pressure steam source of the steam turbine; if the low-pressure state of the steam turbine is confirmed to be a low-pressure sudden loss state, controlling the high-pressure steam source and the auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump; if the low-pressure state of the steam turbine is determined to be a low-pressure insufficient state, the high-pressure steam source and the low-pressure steam source of the steam turbine are controlled to supply steam to the steam-driven water-feeding pump, so that the steam-driven water-feeding pump maintains stable rotating speed. The steam-driven water-feeding pump is supplied with steam by adopting the high-pressure steam source, so that the steam-driven water-feeding pump can be kept to stably operate when the low-pressure steam source of the steam turbine is determined to be in a low-pressure sudden loss state; when the steam turbine has non-stop faults, auxiliary steam supply is carried out through the high-pressure steam source so as to compensate insufficient steam supply of the low-pressure steam source of the steam turbine. The invention effectively prevents the steam feed pump from generating insufficient water supply and reduces the phenomenon of abnormal shutdown of the steam turbine.
Description
Technical Field
The invention belongs to the field of power generating sets of thermal power plants, and particularly relates to a steam feed pump control method, a steam feed pump control module and a steam feed pump control system of a thermal power generating set.
Background
Along with the development of science and technology and electric power industry, the capacity of a single machine of a steam turbine generator unit is continuously expanded, correspondingly, the application of a steam feed pump is more and more common, and when a steam turbine of the steam turbine generator unit runs normally under high load, the steam feed pump mainly works by using low-pressure steam output by the fourth section of the steam turbine. The steam feed pump is used for supplying water to the boiler, and the boiler can generate steam to drive the steam turbine in the steam turbine generator unit to operate. However, under some abnormal working conditions, the steam turbine cannot normally operate, and further the steam turbine supplies steam to the steam-driven water supply pump insufficiently or directly does not supply steam, and further the water supply pump cannot supply enough water to the boiler, so that the economic efficiency of the unit is reduced or the unit is abnormally stopped.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control method of a steam-driven water feed pump of a thermal generator set, which solves the problem that the steam-driven water feed pump is easy to have insufficient steam supply when a steam turbine fails. The invention also provides a steam feed pump control module of the thermal generator set and a steam feed pump control system of the thermal generator set.
According to the embodiment of the first aspect of the invention, the steam-driven feed water pump control method for the thermal generator set comprises the following steps:
acquiring low-pressure information of a steam turbine;
confirming a steam turbine low-pressure state of a steam turbine low-pressure steam source according to the steam turbine low-pressure information, wherein the steam turbine low-pressure state comprises a low-pressure insufficient state and a low-pressure sudden-loss state, and the steam turbine low-pressure steam source is used for outputting steam turbine low-pressure steam to drive the steam-driven water-feeding pump to operate;
if the low-pressure state of the steam turbine is confirmed to be the low-pressure sudden loss state, controlling a high-pressure steam source and an auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed, wherein the high-pressure steam source is used for outputting high-pressure steam, and the auxiliary low-pressure steam source is used for outputting auxiliary low-pressure steam;
and if the low-pressure state of the steam turbine is confirmed to be the low-pressure insufficient state, controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed.
The steam-driven feed pump control method for the thermal generator set provided by the embodiment of the invention at least has the following technical effects: the steam-driven water supply pump is supplied with steam by adopting the high-pressure steam source, so that the running rotating speed of the steam-driven water supply pump can be timely maintained when the low-pressure steam source of the steam turbine is determined to be in a low-pressure sudden loss state, namely the condition of sudden loss occurs, the insufficient water supply is avoided, and the steam is supplied by combining the high-pressure steam source and the auxiliary low-pressure steam source, so that the steam-driven water supply pump can finally keep stable running; when the steam turbine has non-stop faults, a low-pressure insufficient state may occur, namely, the situation of insufficient steam supply to the steam-driven water-feeding pump occurs, and auxiliary steam supply can be performed through the high-pressure steam source to compensate the problem of insufficient steam supply of the low-pressure steam source of the steam turbine, so that the stable rotating speed of the steam-driven water-feeding pump is ensured. Compared with the traditional steam supply mode of a single-steam-turbine low-pressure steam source, the steam-driven water supply pump control method for the thermal power generating unit has better stability, can effectively prevent the steam-driven water supply pump from generating insufficient water supply, provides enough time and water supply basis for the steam turbine to be recovered to a normal operation state after the steam turbine is removed from a fault, and effectively reduces the phenomenon of abnormal shutdown of the steam turbine.
According to some embodiments of the invention, the controlling the high-pressure steam source and the auxiliary low-pressure steam source to supply steam to the steam-driven water feeding pump comprises the following steps:
the opening of a high-pressure steam regulating valve between the high-pressure steam source and the steam-driven water-feeding pump is adjusted in a step-by-step mode, so that the steam-driven water-feeding pump maintains stable rotating speed;
opening an auxiliary steam regulating valve between the auxiliary low-pressure steam source and the steam-driven water-feeding pump, and closing a steam-driven steam regulating valve between the steam-driven low-pressure steam source and the steam-driven water-feeding pump;
and reducing the opening degree of the high-pressure steam regulating valve, and increasing the opening degree of the auxiliary steam regulating valve until the steam feed water pump maintains stable rotating speed only by depending on the auxiliary low-pressure steam source.
According to some embodiments of the invention, the step-adjusting the opening of the high-pressure steam regulating valve between the high-pressure steam source and the steam feed water pump comprises the following steps:
acquiring the generator set load of the generator set before the low-pressure state of the steam turbine is confirmed to be the low-pressure sudden loss state;
determining the sudden loss initial opening of the high-pressure steam regulating valve according to the generator set load and preset load opening configuration information, wherein the load opening configuration information comprises different sudden loss initial openings corresponding to different generator set loads;
And step-adjusting the opening degree of the high-pressure steam adjusting valve to the initial sudden-loss opening degree.
According to some embodiments of the invention, the constraint formula of the load opening configuration information is:
Y＝0.038X+10.8，
and Y is the sudden loss initial opening, and X is the load of the generator set.
According to some embodiments of the invention, the basis for confirming that the turbine low pressure state is the low pressure insufficient state is:
the actual opening of the low-pressure regulating valve at the inlet of the steam feed pump is larger than or equal to a preset under-pressure threshold value.
According to some embodiments of the invention, the controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump comprises the following steps:
and opening a high-pressure steam regulating valve between the high-pressure steam source and the steam feed pump, and dynamically regulating the opening of the high-pressure steam regulating valve according to the running rotating speed of the steam feed pump, so that the running rotating speed of the steam feed pump is kept stable under the driving of the low-pressure steam source and the high-pressure steam source of the steam turbine.
According to some embodiments of the present invention, the low pressure state of the steam turbine further includes a low pressure normal state, and if the low pressure state of the steam turbine is determined as the low pressure normal state, the method for controlling the steam-driven feed water pump of the thermal generator set further includes:
If the load of a generator set of the generator set exceeds a preset first low-pressure steam threshold value, controlling a low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump;
if the load of the generator set is lower than a preset second low-pressure steam threshold value, controlling the auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump;
wherein the first low pressure steam threshold is greater than the second low pressure steam threshold.
According to some embodiments of the invention, the first low pressure steam threshold is set at forty percent of the rated load of the genset and the second low pressure steam threshold is set at thirty-five percent of the rated load of the genset.
According to a second aspect of the invention, the steam feed pump control module of the thermal generator set comprises:
the low-pressure state confirmation unit is used for confirming the low-pressure state of the steam turbine of the low-pressure steam source of the steam turbine, and the low-pressure state of the steam turbine comprises a low-pressure insufficient state and a low-pressure sudden loss state;
the rotating speed control unit is used for controlling the low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source of the steam turbine to drive the steam-driven water feeding pump to operate after the low-pressure sudden loss state is confirmed;
the low-pressure state of the steam turbine is confirmed to be the low-pressure sudden loss state, and a high-pressure steam source and an auxiliary low-pressure steam source are controlled to supply steam to the steam-driven water-feeding pump, so that the steam-driven water-feeding pump maintains stable rotating speed; and confirming that the low-pressure state of the steam turbine is the low-pressure insufficient state, and controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed.
The steam feed pump control module of the thermal generator set according to the embodiment of the invention at least has the following technical effects: the rotating speed control unit controls the high-pressure steam source to supply steam to the steam-driven water-feeding pump, can timely keep the running rotating speed of the steam-driven water-feeding pump when the low-pressure state confirmation unit confirms that the low-pressure steam source of the steam turbine is in a low-pressure sudden loss state, namely when the situation of sudden loss occurs, so as to avoid insufficient water supply, and finally can keep the steam-driven water-feeding pump running stably through the combined steam supply of the high-pressure steam source and the auxiliary low-pressure steam source; when the steam turbine has a non-stop fault, a low-pressure insufficient state may occur, namely, the situation that steam supply to the steam-driven water-feeding pump is insufficient occurs, and steam supply can be assisted through the high-pressure steam source so as to compensate the problem of insufficient steam supply of the low-pressure steam source of the steam turbine and ensure the stable rotating speed of the steam-driven water-feeding pump. The steam feed pump control module of the thermal power generating unit can effectively prevent the steam feed pump from generating insufficient water supply, provide enough time and water supply basis for the steam turbine to get rid of faults and recover to a normal operation state, and effectively reduce the phenomenon of abnormal shutdown of the steam turbine.
According to the steam-operated feed water pump control system of the thermal generator set in the embodiment of the third aspect of the invention, the system comprises:
The low-pressure steam source of the steam turbine is used for connecting the steam feed pump through a pipe system so as to drive the steam feed pump to operate;
the high-pressure steam source is connected with the steam-driven feed water pump through a pipe system and is used for driving the steam-driven feed water pump to operate;
the auxiliary low-pressure steam source is connected with the steam-driven feed water pump through a pipe system and used for driving the steam-driven feed water pump to operate;
the control valve group is used for adjusting the output states of the low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source of the steam turbine;
the control device connected with the control valve group is internally provided with the steam feed pump control module of the thermal generator set according to claim 9.
The steam feed pump control system of the thermal generator set according to the embodiment of the invention at least has the following technical effects: the steam-driven water supply pump is supplied with steam by adopting the high-pressure steam source, so that the running rotating speed of the steam-driven water supply pump can be timely maintained when the low-pressure steam source of the steam turbine is determined to be in a low-pressure sudden loss state, namely the condition of sudden loss occurs, the insufficient water supply is avoided, and the steam is supplied by combining the high-pressure steam source and the auxiliary low-pressure steam source, so that the steam-driven water supply pump can finally keep stable running; when the steam turbine has non-stop faults, a low-pressure insufficient state may occur, namely, the situation of insufficient steam supply to the steam-driven water-feeding pump occurs, and auxiliary steam supply can be performed through the high-pressure steam source to compensate the problem of insufficient steam supply of the low-pressure steam source of the steam turbine, so that the stable rotating speed of the steam-driven water-feeding pump is ensured. Compared with the traditional system for supplying steam by using a single-steam-turbine low-pressure steam source, the steam-driven water supply pump control system of the thermal power generator set has better stability, can effectively prevent the steam-driven water supply pump from generating insufficient water supply, provides enough time and water supply basis for the steam turbine to be recovered to a normal operation state after the steam turbine is removed from a fault, and effectively reduces the phenomenon of abnormal shutdown of the steam turbine.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a steam system for implementing a method for controlling a steam-operated feed water pump of a thermal generator set according to an embodiment of the invention;
FIG. 2 is another steam system for implementing a thermal generator set steam feed water pump control method according to an embodiment of the invention;
FIG. 3 is a flow chart of a steam feed pump control method of a thermal generator set according to an embodiment of the invention;
FIG. 4 is a graph of a step-up regulation function for a high pressure steam regulator valve in accordance with an embodiment of the present invention.
Reference numerals:
steam turbine steam regulating valve 100, low pressure regulating valve 200, auxiliary steam regulating valve 300, high pressure steam regulating valve 400.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are merely provided to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the essential numbers, and greater than, less than, etc. are understood as including the essential numbers. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
In order to better describe the steam-driven feed water pump control method of the thermal generator set according to the first aspect of the invention, a steam system for executing the steam-driven feed water pump control method of the thermal generator set according to the embodiment of the invention is provided.
Referring to fig. 1 and 2, a steam turbine low-pressure steam source (i.e., a four-stage steam extraction pipeline of a steam turbine) is connected to a steam turbine steam regulating valve 100, then connected to a low-pressure regulating valve 200 through the steam turbine steam regulating valve 100, and finally enters a steam-driven water-feeding pump through the low-pressure regulating valve 200, so that the steam turbine low-pressure steam (i.e., the four-stage steam, which is output from a steam turbine intermediate pressure cylinder) output through the four-stage steam extraction pipeline drives the steam-driven water-feeding pump to operate.
The high-pressure steam output by the high-pressure steam source is the cold-stage steam output by the reheater, and when the steam turbine has an operation fault and the steam pressure in the intermediate pressure cylinder is insufficient, the reheater still has enough high-pressure steam. In some embodiments of the present invention, referring to FIG. 1, a high pressure steam source is connected to the inlet of the low pressure regulator valve 200 through a high pressure steam regulator valve 400 and output by the low pressure regulator valve 200 to the steam feed pump. In some embodiments of the present invention, referring to FIG. 2, because the steam-powered feedwater pump has a high pressure input and a low pressure input, the high pressure steam source is now directly input into the high pressure input of the startup feedwater pump through the high pressure steam regulator valve 400.
The supplementary low pressure steam source of supplementary low pressure steam source output is more, can use the reheater to export supplementary low pressure steam after through supplementary steam header, also can directly use outside supplementary low pressure steam, for example: the auxiliary steam boiler used when the steam turbine is started is used for directly generating low-pressure auxiliary steam, auxiliary steam provided by other generator sets can be used, and the like, as long as stable auxiliary low-pressure steam can be provided. The auxiliary low pressure steam output from the auxiliary low pressure steam source passes through the auxiliary steam adjustment valve 300.
In addition, the steam turbine steam regulating valve 100, the low pressure regulating valve 200, and the auxiliary steam regulating valve 300 all adopt electric valves with adjustable opening (or intermediate stop) to realize automatic regulation. The high pressure steam regulating valve 400 adopts a quick-opening pneumatic gate valve to realize step-type regulation, and a pneumatic control part of the quick-opening pneumatic gate valve is controlled by an electromagnetic valve to realize automatic regulation.
The thermal power generation system and the application scenario described in the embodiment of the present invention are for more clearly illustrating the technical solution of the embodiment of the present invention, and do not limit the technical solution provided in the embodiment of the present invention, and it can be known by those skilled in the art that the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems along with the evolution of the thermal power generation system technology and the occurrence of new application scenarios.
A method for controlling a steam-operated feed water pump of a thermal generator set according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 4.
Acquiring low-pressure information of a steam turbine;
confirming the low-pressure state of the steam turbine of the low-pressure steam source of the steam turbine according to the low-pressure information of the steam turbine, wherein the low-pressure state of the steam turbine comprises a low-pressure insufficient state and a low-pressure sudden loss state, and the low-pressure steam source of the steam turbine is used for outputting low-pressure steam of the steam turbine to drive a steam-driven water feeding pump to operate;
If the low-pressure state of the steam turbine is confirmed to be a low-pressure sudden-loss state, controlling a high-pressure steam source and an auxiliary low-pressure steam source to supply steam to a steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed, wherein the high-pressure steam source is used for outputting high-pressure steam, and the auxiliary low-pressure steam source is used for outputting auxiliary low-pressure steam;
if the low-pressure state of the steam turbine is determined to be a low-pressure insufficient state, the high-pressure steam source and the low-pressure steam source of the steam turbine are controlled to supply steam to the steam-driven feed water pump, so that the steam-driven feed water pump maintains stable rotating speed.
Referring to fig. 1 to 3, when a steam turbine fails, a low-pressure state of the steam turbine of a low-pressure steam source of the steam turbine needs to be confirmed, some failures may cause four steam extractions output by a medium-pressure cylinder of the steam turbine to disappear directly, and after such failure conditions occur, the low-pressure state of the steam turbine may be determined as a low-pressure sudden-loss state; some faults can cause four-extraction steam at the output end of a steam turbine intermediate pressure cylinder to be reduced but not directly disappear, the four-extraction steam cannot supply stable operation of a steam feed water pump, and at the moment, the low-pressure state of the steam turbine can be determined to be a low-pressure insufficient state. It should be noted that, for the confirmation of the low pressure insufficient state and the low pressure sudden loss state, the confirmation is mainly performed through the steam turbine low pressure information, the steam turbine low pressure information may be obtained by directly using a fault signal from a controller of a steam turbine, a generator, or the like, or may be obtained by further determining the collected pressures of the steam turbine low pressure steam source, the auxiliary low pressure steam source, and the high pressure steam source.
After the low-pressure state of the steam turbine is confirmed to be a low-pressure sudden-loss state, because the low-pressure steam source of the steam turbine disappears at the moment, the high-pressure steam source and the auxiliary low-pressure steam source are required to be used for steam supply, the high-pressure steam source can maintain the stable rotating speed of the steam-driven water-feeding pump in the initial period of disappearance of the low-pressure steam source of the steam turbine, and then the steam-driven water-feeding pump can stably operate under the driving of the auxiliary low-pressure steam source in a mode of gradually throwing the auxiliary low-pressure steam source and slowly withdrawing the high-pressure steam source. Here, since the high-pressure steam source is used for stability of the low-pressure steam source control, if it is possible to stably drive only the low-pressure steam source, it is possible to drive only the low-pressure steam source.
When the low-pressure state of the steam turbine is determined to be the low-pressure insufficient state, the low-pressure steam output by the low-pressure steam source of the steam turbine is insufficient to drive the steam-driven water-feeding pump to normally work, at the moment, the high-pressure steam regulating valve 400 is opened to supplement part of high-pressure steam to be driven together with the low-pressure steam of the steam turbine, the specific opening degree of the high-pressure steam regulating valve 400, namely the steam quantity output by the high-pressure steam source, needs to be determined according to the specific rotating speed state of the steam-driven water-feeding pump, and the purpose is to maintain the rotating speed of the steam-driven water-feeding pump to be stable through the supplement of the high-pressure steam.
According to the steam-driven water-feeding pump control method of the thermal power generating set, the steam is supplied to the steam-driven water-feeding pump by the high-pressure steam source, the running rotating speed of the steam-driven water-feeding pump can be timely maintained when the low-pressure steam source of the steam turbine is confirmed to be in a low-pressure sudden loss state, namely, the situation of sudden loss occurs, the water supply is not sufficient, and the steam is supplied by combining the high-pressure steam source and the auxiliary low-pressure steam source, so that the steam-driven water-feeding pump can finally keep stable running; when the steam turbine has a non-stop fault, a low-pressure insufficient state possibly occurs, namely, the situation that steam supply to the steam-driven water-feeding pump is insufficient occurs, and steam supply can be assisted through a high-pressure steam source so as to compensate the problem that the steam supply of the low-pressure steam source of the steam turbine is insufficient, and the stable rotating speed of the steam-driven water-feeding pump is ensured. Compared with the traditional steam supply mode of a single-steam-turbine low-pressure steam source, the steam-turbine low-pressure steam supply control method for the thermal generator set has better stability, can effectively prevent the steam-turbine low-pressure steam source from generating insufficient water supply, provides enough time and water supply basis for the steam turbine to recover to a normal running state after removing faults, and effectively reduces the phenomenon of abnormal shutdown of the steam turbine.
In some embodiments of the invention, controlling the high pressure steam source and the auxiliary low pressure steam source to supply steam to the steam-driven water-feeding pump comprises the following steps:
the opening degree of a high-pressure steam regulating valve 400 between a high-pressure steam source and a steam feed water pump is adjusted in a step-by-step mode, so that the steam feed water pump maintains stable rotating speed;
opening an auxiliary steam regulating valve 300 between an auxiliary low-pressure steam source and a steam-driven water feeding pump, and closing a steam-driven steam regulating valve 100 between the steam-driven low-pressure steam source and the steam-driven water feeding pump;
the opening degree of the high-pressure steam regulating valve 400 is reduced, and the opening degree of the auxiliary steam regulating valve 300 is increased until the steam-driven water-feeding pump only depends on the auxiliary low-pressure steam source to maintain the stable rotating speed.
When the low-pressure state of the steam turbine is determined to be a low-pressure sudden-loss state, the four-pumping steam suddenly disappears at the moment, and further the rotation speed of the steam-driven feed-water pump may drop rapidly, and at the moment, the opening degree of the high-pressure steam regulating valve 400 needs to be rapidly regulated to a sufficient size so as to provide sufficient high-pressure steam to maintain the rotation speed of the steam-driven feed-water pump. Meanwhile, the auxiliary steam regulating valve 300 starts to be opened, so that the auxiliary low-pressure steam is gradually put into the driving work of the steam feed pump, and the high-pressure steam regulating valve 400 is gradually closed in the process of gradually increasing the opening degree of the auxiliary steam regulating valve 300 until the steam feed pump can be maintained to stably operate only by using the low-pressure auxiliary steam. It should be noted that the steam turbine steam control valve 100 is closed when the auxiliary steam control valve 300 is opened after the four-extraction steam suddenly disappears.
In some embodiments of the present invention, the step-adjusting the opening of the high-pressure steam regulating valve 400 between the high-pressure steam source and the steam feed water pump comprises the following steps:
acquiring the generator set load of a generator set before the low-pressure state of the steam turbine is confirmed to be a low-pressure sudden loss state;
determining the initial sudden loss opening of the high-pressure steam regulating valve 400 according to the load of the generator set and preset load opening configuration information, wherein the load opening configuration information comprises different initial sudden loss openings corresponding to different generator set loads;
the opening degree of the high pressure steam regulating valve 400 is stepwise regulated to the quench initial opening degree.
The step-type adjustment of the high-pressure steam adjusting valve 400 is not a fixed value, the actual load of the generator set needs to be considered for the specific opening, if the load of the generator set is large and the opening of the high-pressure steam adjusting valve 400 is not enough, the steam supply to the steam-driven water-feeding pump is insufficient, and further the rotating speed of the steam-driven water-feeding pump is not enough, so that the steam-driven water-feeding pump cannot provide enough water to a steam turbine, and the steam turbine is stopped; if the load of the generator set is small and the opening of the high-pressure steam regulating valve 400 is hooked up, the steam supply to the steam feed pump is excessive, the rotating speed of the steam feed pump is too high, the water quantity supplied to the steam turbine by the steam feed pump is too large, and meanwhile, the water feed pump can be started to run at a speed exceeding the rated rotating speed to damage the steam feed pump.
Therefore, the initial opening of the high-pressure steam control valve 400 needs to be adapted to the load of the generator set. Here, load opening degree configuration information is constructed in which initial opening degrees corresponding to the high-pressure steam regulating valve 400 in a plurality of load cases are stored and recorded as a sudden-loss initial opening degree. Before the high-pressure steam regulating valve 400 needs to be opened, the load of the generator set is determined, and then the high-pressure steam regulating valve 400 is regulated in a step mode according to the corresponding sudden-loss initial opening degree in the load opening degree configuration information.
In some embodiments of the present invention, the constraint formula of the load opening configuration information is:
Y＝0.038X+10.8，
in the formula, Y is the initial opening degree of sudden loss, and X is the load of the generator set.
The initial opening degree corresponding to the high-pressure steam regulating valve 400 under any generator set load can be calculated by utilizing the constraint formula, and the stable operation of the steam feed water pump can be ensured.
Further, in some embodiments of the present invention, referring to fig. 4, the abscissa in fig. 4 is the genset load immediately before the genset confirms the low pressure quench condition and the ordinate is the quench initiation opening that regulates the high pressure steam regulator valve. Because the steam-driven water-feeding pump does not only need to maintain the steam supply of the generator set, and peripheral systems of the generator set also need to use the supplied water for steam supply, when the load of the generator set is too small, the opening degree of the high-pressure steam regulating valve 400 is maintained at a fixed position, and after the fixed position is exceeded, the initial opening degree of the high-pressure steam regulating valve 400 is calculated by using the constraint formula.
In some embodiments of the present invention, the basis for confirming that the low pressure state of the steam turbine is the low pressure insufficient state is:
the actual opening of the low-pressure regulating valve 200 at the inlet of the steam feed pump is larger than or equal to the preset under-pressure threshold value.
In the case where the low-pressure steam is supplied sufficiently during the normal operation of the steam turbine, the opening degree of the low-pressure control valve 200 is not excessively opened although it is adjusted according to the operation load of the steam feed pump. When the supplied low-pressure steam is gradually reduced, at this time, in order to ensure the normal operation of the steam feed pump, the opening degree of the low-pressure regulating valve 200 is regulated to be larger, and when the opening degree of the low-pressure regulating valve 200 is regulated to exceed an under-pressure threshold value and the steam feed pump cannot be supplied to normally operate, an external steam source is required to be used for supplementing steam to ensure the normal operation of the steam feed pump, that is, the low-pressure state of the steam turbine is confirmed to be a low-pressure insufficient state, and the high-pressure steam source is required to be used for supplementing steam. In some embodiments of the present invention, the under-pressure threshold is set at 85% of the maximum opening of the low-pressure regulating valve 200, and when the opening of the low-pressure regulating valve 200 exceeds 85%, the low-pressure insufficient state can be determined.
In some embodiments of the invention, controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump comprises the following steps:
And opening the high-pressure steam regulating valve 400 between the high-pressure steam source and the steam feed water pump, and dynamically regulating the opening of the high-pressure steam regulating valve 400 according to the running rotating speed of the steam feed water pump, so that the running rotating speed of the steam feed water pump is kept stable under the driving of the low-pressure steam source and the high-pressure steam source of the steam turbine.
When the low-pressure state of the steam turbine is determined to be the low-pressure insufficient state, the low-pressure steam output by the low-pressure steam source of the steam turbine is insufficient to drive the steam-driven water feeding pump to normally work, at the moment, the high-pressure steam regulating valve 400 is opened to supplement part of high-pressure steam to be driven together with the low-pressure steam of the steam turbine, and the specific opening degree of the high-pressure steam regulating valve 400 is regulated according to the running rotating speed of the steam-driven water feeding pump, so that the aim of utilizing the high-pressure steam to assist the low-pressure steam of the steam turbine to control the rotating speed of the steam-driven water feeding pump to be stable is fulfilled. Specifically, the smaller the output amount of the low-pressure steam of the steam turbine is, the more the output amount of the high-pressure steam is, and the effect of controlling the rotating speed of the steam feed water pump by using the high-pressure steam is basically achieved.
In some embodiments of the present invention, the low pressure state of the steam turbine further includes a low pressure normal state, and if the low pressure state of the steam turbine is determined as the low pressure normal state, the method for controlling the steam-driven feed water pump of the thermal generator set further includes:
If the load of a generator set of the generator set exceeds a preset first low-pressure steam threshold value, controlling a low-pressure steam source of a steam turbine to supply steam to a steam-driven water-feeding pump;
if the load of the generator set is lower than a preset second low-pressure steam threshold value, controlling an auxiliary low-pressure steam source to supply steam to a steam-driven water-feeding pump;
wherein the first low pressure steam threshold is greater than the second low pressure steam threshold.
When the steam turbine normally operates, four-extraction steam is used for steam supply, but when the load of the generator set is low, the four-extraction steam may not be enough to drive the steam-driven water supply pump to stably operate, and for the situation, auxiliary low-pressure steam is used for auxiliary driving. Specifically, when the load of the generator set exceeds a first low-pressure steam threshold value, the operation load of the steam turbine is enough, and four steam pumps generated by a steam turbine intermediate pressure cylinder are enough to drive a water accumulation pump to normally operate; when the load of the generator set is lower than the second low-pressure steam threshold value, the operation load of the steam turbine is low, four-extraction steam generated by a steam turbine intermediate pressure cylinder is not enough to drive a starting water accumulation pump to normally operate, and at the moment, auxiliary steam is switched to be used for steam supply. It should be noted that, when switching the low-pressure steam source, the steam turbine steam regulating valve 100 and the auxiliary steam regulating valve 300 do not change abruptly, but change the opening degree slowly until the switching is completed, so as to ensure that the steam pressure is more stable during the switching process. It should be noted that, in some embodiments of the present invention, in order to ensure the stable rotation speed of the steam-driven feed-water pump during the automatic switching process of the steam-driven steam regulating valve 100 and the auxiliary steam regulating valve 300, the regulation rate of the valve of the low-pressure regulating valve 200 is adapted to the rotation speed variation rate of the steam-driven feed-water pump, that is, the regulation rate of the valve of the low-pressure regulating valve 200 is faster as the rotation speed variation is larger, so that the rotation speed and the feed-water flow of the steam-driven feed-water pump can be quickly responded and the carefree and stable state can be ensured. In addition, the first low-pressure steam threshold value is greater than the second low-pressure steam threshold value, and a certain difference value exists between the first low-pressure steam threshold value and the second low-pressure steam threshold value, so that the steam turbine steam regulating valve 100 and the auxiliary steam regulating valve 300 are not switched too frequently.
In some embodiments of the present invention, the first low pressure steam threshold is set at forty percent of the rated load of the genset and the second low pressure steam threshold is set at thirty-five percent of the rated load of the genset. The first low-pressure steam threshold value and the second low-pressure steam threshold value are set according to actual engineering conditions, and after the first low-pressure steam threshold value and the second low-pressure steam threshold value are set, stable operation of the steam turbine can be effectively guaranteed, and meanwhile, the steam turbine can have extremely high economical efficiency. In addition, it should be noted that the setting of the two threshold values can meet the requirements in most scenes, and is beneficial to industrial popularization.
The steam-driven feed water pump control system of the thermal generator set comprises a low-pressure state confirmation unit and a rotating speed control unit.
The low-pressure state confirmation unit is used for confirming the low-pressure state of the steam turbine of the low-pressure steam source of the steam turbine, and the low-pressure state of the steam turbine comprises a low-pressure insufficient state and a low-pressure sudden loss state;
the rotating speed control unit is used for controlling the low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source of the steam turbine to drive the steam-driven water-feeding pump to operate after the low-pressure sudden loss state is confirmed;
the method comprises the following steps of confirming that the low-pressure state of the steam turbine is a low-pressure sudden-loss state, and controlling a high-pressure steam source and an auxiliary low-pressure steam source to supply steam to a steam-driven feed water pump so as to enable the steam-driven feed water pump to maintain stable rotating speed; and controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven feed water pump so as to maintain the stable rotating speed of the steam-driven feed water pump.
Referring to fig. 1 to 3, when a steam turbine has a fault, a low pressure state of the steam turbine of the low pressure steam source is first confirmed by a low pressure state confirmation unit. Some faults can cause four steam extractions output by a steam turbine medium pressure cylinder to directly disappear, and after the fault condition appears, the low pressure state of the steam turbine can be determined as a low pressure sudden loss state; some faults can cause four-extraction steam at the output end of a steam turbine intermediate pressure cylinder to be reduced but not directly disappear, the four-extraction steam cannot supply stable operation of a steam feed water pump, and at the moment, the low-pressure state of the steam turbine can be determined to be a low-pressure insufficient state. It should be noted that, for the confirmation of the low pressure insufficient state and the low pressure sudden loss state, the confirmation is mainly performed through the steam turbine low pressure information, the steam turbine low pressure information may be obtained by directly using a fault signal from a controller of a steam turbine, a generator, or the like, or may be obtained by further determining the collected pressures of the steam turbine low pressure steam source, the auxiliary low pressure steam source, and the high pressure steam source.
After the low-pressure state of the steam turbine is confirmed to be a low-pressure sudden-loss state, because the low-pressure steam source of the steam turbine disappears at the moment, the high-pressure steam source and the auxiliary low-pressure steam source need to be controlled by the rotating speed control unit to supply steam, the high-pressure steam source can maintain the rotating speed of the steam-driven water-feeding pump to be stable in the initial period of time when the low-pressure steam source of the steam turbine disappears, and then the steam-driven water-feeding pump can stably operate under the driving of the auxiliary low-pressure steam source in a mode of gradually throwing the auxiliary low-pressure steam source and slowly withdrawing the high-pressure steam source.
When the low-pressure state of the steam turbine is determined to be a low-pressure insufficient state, the low-pressure steam of the steam turbine output by the low-pressure steam source of the steam turbine is insufficient to drive the normal operation of the steam-driven water-feeding pump, at this time, the rotating speed control unit can open the high-pressure steam regulating valve 400 to supplement part of the high-pressure steam to be driven together with the low-pressure steam of the steam turbine, the specific opening degree of the high-pressure steam regulating valve 400, namely the steam quantity output by the high-pressure steam source, needs to be determined according to the specific rotating speed state of the steam-driven water-feeding pump, and the aim is to maintain the rotating speed of the steam-driven water-feeding pump stable through the supplement of the high-pressure steam.
According to the steam-driven water supply pump control module of the thermal power generating unit, the rotating speed control unit supplies steam to the steam-driven water supply pump by controlling the high-pressure steam source, the running rotating speed of the steam-driven water supply pump can be timely maintained when the low-pressure state confirmation unit confirms that the low-pressure steam source of the steam turbine is in a low-pressure sudden loss state, namely the situation of sudden loss occurs, the water supply deficiency is avoided, and the steam is supplied by combining the high-pressure steam source and the auxiliary low-pressure steam source, so that the steam-driven water supply pump can finally be kept in stable running; when the steam turbine has a non-stop fault, a low-pressure insufficient state may occur, namely, the situation that steam supply to the steam-driven water-feeding pump is insufficient occurs, and steam supply can be assisted through the high-pressure steam source so as to compensate the problem of insufficient steam supply of the low-pressure steam source of the steam turbine and ensure the stable rotating speed of the steam-driven water-feeding pump. The steam feed pump control module of the thermal power generating unit can effectively prevent the steam feed pump from generating insufficient water supply, provide enough time and water supply basis for the steam turbine to get rid of faults and recover to a normal operation state, and effectively reduce the phenomenon of abnormal shutdown of the steam turbine.
In some embodiments of the present invention, the low pressure state of the steam turbine further includes a low pressure normal state, and if the low pressure state of the steam turbine is determined as the low pressure normal state, the rotation speed control unit is configured to control switching between the low pressure steam of the steam turbine and the auxiliary low pressure steam according to a first low pressure steam threshold and a second low pressure steam threshold, where it is determined that a load of the generator set exceeds the first low pressure steam threshold, the low pressure steam source of the steam turbine is controlled to supply steam to the steam-driven water-feeding pump, it is determined that the load of the generator set is lower than the second low pressure steam threshold, and the auxiliary low pressure steam source is controlled to supply steam to the steam-driven water-feeding pump, where the first low pressure steam threshold is greater than the second low pressure steam threshold.
When the steam engine is in normal operation, four-extraction steam is used for steam supply, but when the load of the generator set is low, the four-extraction steam may not be enough to drive the steam feed pump to stably operate, and auxiliary low-pressure steam is used for employer drive. Specifically, when the load of the generator set exceeds a first low-pressure steam threshold value, the operation load of the steam turbine is enough, and four steam pumps generated by a steam turbine intermediate pressure cylinder are enough to drive a water accumulation pump to normally operate; when the load of the generator set is lower than the second low-pressure steam threshold value, the operation load of the steam turbine is low, four-extraction steam generated by a steam turbine intermediate pressure cylinder is not enough to drive a water accumulation pump to normally operate, and at the moment, auxiliary steam is switched to be used for steam supply.
According to the steam-operated feed water pump control system of the thermal generator set in the embodiment of the third aspect of the invention, the system comprises: the system comprises a steam engine low-pressure steam source, a high-pressure steam source, an auxiliary low-pressure steam source, a control valve group and a control device.
The steam machine low-pressure steam source is used for connecting the steam feed pump through a pipe system so as to drive the steam feed pump to operate;
the high-pressure steam source is connected with the steam-driven water-feeding pump through a pipe system and is used for driving the steam-driven water-feeding pump to operate;
the auxiliary low-pressure steam source is connected with the steam-driven water feeding pump through a pipe system and used for driving the steam-driven water feeding pump to operate;
the control valve group is used for adjusting the output states of the low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source of the steam turbine;
the control device connected with the control valve group is internally provided with the steam feed pump control module of the thermal generator set according to claim 9.
Referring to fig. 1 to 3, when a steam turbine has a fault, a control device is first required to confirm a low-pressure state of the steam turbine of a low-pressure steam source of the steam turbine, and some faults can cause four steam extractions output by a medium-pressure cylinder of the steam turbine to directly disappear; some faults can cause four-extraction steam at the output end of a steam turbine intermediate pressure cylinder to be reduced but not directly disappear, the four-extraction steam cannot supply stable operation of a steam feed water pump, and at the moment, the low-pressure state of the steam turbine can be determined to be a low-pressure insufficient state.
The control valve group comprises a steam turbine steam regulating valve 100, an auxiliary steam regulating valve 300, a high-pressure steam regulating valve 400 and a low-pressure regulating valve 200, wherein the low-pressure regulating valve 200 is already in a fully opened state when the steam turbine works normally. The steam turbine steam regulating valve 100, the auxiliary steam regulating valve 300 and the high-pressure steam regulating valve 400 can respectively control the steam amount input into the steam-driven feed water pump by the steam turbine low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source.
After confirming that the low-pressure state of the steam turbine is a low-pressure sudden loss state, a low-pressure insufficient state or a low-pressure normal state, the control device can complete the input of steam by adjusting the opening degree of the corresponding steam turbine steam regulating valve 100, the auxiliary steam regulating valve 300 or the high-pressure steam regulating valve 400 so as to ensure that the steam source of the steam-driven water-feeding pump is sufficient, thereby maintaining the stable operation.
According to the steam-driven water supply pump control system of the thermal power generating unit, the steam is supplied to the steam-driven water supply pump by adopting the high-pressure steam source, the running rotating speed of the steam-driven water supply pump can be timely maintained when the low-pressure steam source of the steam turbine is determined to be in a low-pressure sudden loss state, namely the situation of sudden loss occurs, the water supply is not sufficient, and the steam is supplied by combining the high-pressure steam source and the auxiliary low-pressure steam source, so that the steam-driven water supply pump can finally keep stable running; when the steam turbine has a non-stop fault, a low-pressure insufficient state possibly occurs, namely, the situation that steam supply to the steam-driven water-feeding pump is insufficient occurs, and steam supply can be assisted through a high-pressure steam source so as to compensate the problem that the steam supply of the low-pressure steam source of the steam turbine is insufficient, and the stable rotating speed of the steam-driven water-feeding pump is ensured. Compared with a traditional system for supplying steam by a single-steam-turbine low-pressure steam source, the steam-driven water supply pump control system of the thermal power generating unit has better stability, can effectively prevent the steam-driven water supply pump from generating insufficient water supply, provides enough time and water supply basis for the steam turbine to get rid of faults and recover to a normal running state, and effectively reduces the phenomenon of abnormal shutdown of the steam turbine.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A steam-driven feed pump control method for a thermal generator set is characterized by comprising the following steps:
acquiring low-pressure information of a steam turbine;
Confirming a steam turbine low-pressure state of a steam turbine low-pressure steam source according to the steam turbine low-pressure information, wherein the steam turbine low-pressure state comprises a low-pressure insufficient state and a low-pressure sudden-loss state, and the steam turbine low-pressure steam source is used for outputting steam turbine low-pressure steam to drive the steam-driven water-feeding pump to operate; the low-pressure state of the steam turbine also comprises a low-pressure normal state;
if the low-pressure state of the steam turbine is confirmed to be the low-pressure sudden loss state, controlling a high-pressure steam source and an auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed, wherein the high-pressure steam source is used for outputting high-pressure steam, and the auxiliary low-pressure steam source is used for outputting auxiliary low-pressure steam;
if the low-pressure state of the steam turbine is confirmed to be the low-pressure insufficient state, controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed;
if the low-pressure state of the steam engine is confirmed to be the low-pressure normal state, the control method of the steam-driven feed water pump of the thermal generator set further comprises the following steps:
if the load of a generator set of the generator set exceeds a preset first low-pressure steam threshold value, controlling a low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump;
If the load of the generator set is lower than a preset second low-pressure steam threshold value, controlling the auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump;
wherein the first low pressure steam threshold is greater than the second low pressure steam threshold.
2. The method for controlling the steam-driven water-feeding pump of the thermal generator set according to claim 1, wherein the step of controlling the high-pressure steam source and the auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump comprises the following steps:
the opening of a high-pressure steam regulating valve between the high-pressure steam source and the steam-driven water-feeding pump is adjusted in a step-by-step mode, so that the steam-driven water-feeding pump maintains stable rotating speed;
opening an auxiliary steam regulating valve between the auxiliary low-pressure steam source and the steam-driven water-feeding pump, and closing a steam-driven steam regulating valve between the steam-driven low-pressure steam source and the steam-driven water-feeding pump;
and reducing the opening degree of the high-pressure steam regulating valve, and increasing the opening degree of the auxiliary steam regulating valve until the steam feed water pump maintains stable rotating speed only by depending on the auxiliary low-pressure steam source.
3. The thermal generator set steam-driven feed water pump control method according to claim 2, wherein the step-adjusting the opening degree of a high-pressure steam regulating valve between the high-pressure steam source and the steam-driven feed water pump comprises the following steps:
Acquiring the generator set load of the generator set before the low-pressure state of the steam turbine is confirmed to be the low-pressure sudden loss state;
determining the sudden loss initial opening of the high-pressure steam regulating valve according to the generator set load and preset load opening configuration information, wherein the load opening configuration information comprises different sudden loss initial openings corresponding to different generator set loads;
and step-adjusting the opening degree of the high-pressure steam adjusting valve to the initial sudden-loss opening degree.
4. The thermal generator set steam-driven feed water pump control method according to claim 3, wherein the constraint formula of the load opening configuration information is as follows:
Y＝0.038X+10.8，
and Y is the sudden loss initial opening, and X is the load of the generator set.
5. The steam-driven feed water pump control method of the thermal generator set according to claim 1, wherein the basis for confirming that the low-pressure state of the steam turbine is the low-pressure insufficient state is as follows:
the actual opening of the low-pressure regulating valve at the inlet of the steam feed pump is larger than or equal to a preset under-pressure threshold value.
6. The steam-driven feed water pump control method of the thermal generator set according to claim 1, wherein the step of controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven feed water pump comprises the following steps:
And opening a high-pressure steam regulating valve between the high-pressure steam source and the steam feed pump, and dynamically regulating the opening of the high-pressure steam regulating valve according to the running rotating speed of the steam feed pump, so that the running rotating speed of the steam feed pump is kept stable under the driving of the low-pressure steam source and the high-pressure steam source of the steam turbine.
7. The method of claim 1, wherein the first low pressure steam threshold is set at forty percent of a rated load of the genset and the second low pressure steam threshold is set at thirty-five percent of the rated load of the genset.
8. The utility model provides a thermal generator set steam feed pump control system module which characterized in that includes:
the low-pressure state confirmation unit is used for confirming the low-pressure state of the steam turbine of the low-pressure steam source of the steam turbine, and the low-pressure state of the steam turbine comprises a low-pressure insufficient state and a low-pressure sudden loss state; the low-pressure state of the steam turbine also comprises a low-pressure normal state;
the rotating speed control unit is used for controlling the low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source of the steam turbine to drive the steam-driven water-feeding pump to operate after the low-pressure state of the steam turbine is confirmed;
The method comprises the following steps of confirming that the low-pressure state of the steam turbine is the low-pressure sudden loss state, and controlling a high-pressure steam source and an auxiliary low-pressure steam source to supply steam to a steam feed pump so as to enable the steam feed pump to maintain stable rotating speed; confirming that the low-pressure state of the steam turbine is the low-pressure insufficient state, and controlling the high-pressure steam source and the low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump so as to enable the steam-driven water-feeding pump to maintain stable rotating speed;
if the low-pressure state of the steam turbine is determined to be the low-pressure normal state, the rotating speed control unit is further used for:
if the load of a generator set of the generator set exceeds a preset first low-pressure steam threshold value, controlling a low-pressure steam source of the steam turbine to supply steam to the steam-driven water-feeding pump;
if the load of the generator set is lower than a preset second low-pressure steam threshold value, controlling the auxiliary low-pressure steam source to supply steam to the steam-driven water-feeding pump;
wherein the first low pressure steam threshold is greater than the second low pressure steam threshold.
9. The utility model provides a thermal generator set steam feed water pump control system which characterized in that includes:
the low-pressure steam source of the steam turbine is used for connecting the steam feed pump through a pipe system so as to drive the steam feed pump to operate;
The high-pressure steam source is connected with the steam-driven feed water pump through a pipe system and is used for driving the steam-driven feed water pump to operate;
the auxiliary low-pressure steam source is connected with the steam-driven feed water pump through a pipe system and used for driving the steam-driven feed water pump to operate;
the control valve group is used for adjusting the output states of the low-pressure steam source, the high-pressure steam source and the auxiliary low-pressure steam source of the steam turbine;
the control device connected with the control valve group is internally provided with the steam feed pump control module of the thermal generator set according to claim 8.
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| CN102563612A (en) * | 2012-01-30 | 2012-07-11 | 浙江省电力设计院 | Method for directly starting steam-driven feed water pump of large-sized thermal power plant |
| CN203285493U (en) * | 2013-05-30 | 2013-11-13 | 浙江汽轮成套技术开发有限公司 | Steam turbine multi-steam source automatic switching control system |
| CN107178779B (en) * | 2017-04-28 | 2018-10-26 | 申能股份有限公司 | The control method of Variable Speed Feedwater Pumps variable-speed operation |
| CN109296408B (en) * | 2018-09-18 | 2019-08-06 | 国电南京电力试验研究有限公司 | One kind giving mercury vapour turbine vapour source method for handover control |
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| CN110986024A (en) * | 2019-11-04 | 2020-04-10 | 中国能源建设集团华东电力试验研究院有限公司 | 660MW supercritical unit water supply system steam source switching control device and control method |
| CN211399756U (en) * | 2019-11-04 | 2020-09-01 | 中国能源建设集团华东电力试验研究院有限公司 | Steam source switching control device of water supply system of 660MW supercritical unit |
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