CN107956519B - Water spraying system for rear cylinder of low-pressure cylinder of steam turbine and adjusting method - Google Patents
Water spraying system for rear cylinder of low-pressure cylinder of steam turbine and adjusting method Download PDFInfo
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- CN107956519B CN107956519B CN201711203739.2A CN201711203739A CN107956519B CN 107956519 B CN107956519 B CN 107956519B CN 201711203739 A CN201711203739 A CN 201711203739A CN 107956519 B CN107956519 B CN 107956519B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 238000005507 spraying Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 51
- 239000007921 spray Substances 0.000 claims abstract description 51
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 3
- 239000007924 injection Substances 0.000 claims 3
- 238000001816 cooling Methods 0.000 abstract description 15
- 238000000889 atomisation Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 10
- 238000000605 extraction Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
-
- 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/12—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a water spraying system for a rear cylinder of a low-pressure cylinder of a steam turbine and an adjusting method. Most of the water spraying regulating valves of the existing low-pressure cylinder water spraying and cooling device of the steam turbine are fully opened and fully closed, and the atomization effect is poor. The rear cylinder water spraying system of the low-pressure cylinder of the steam turbine comprises a middle-pressure cylinder of the steam turbine, a low-pressure cylinder of the steam turbine and a rear cylinder water spraying device; the exhaust port of the middle pressure cylinder of the steam turbine is connected with the steam inlet of the low pressure cylinder of the steam turbine through a communicating pipe, and an LCV valve is arranged on the communicating pipe; the rear cylinder water spraying device comprises a low-pressure cylinder rear cylinder, a nozzle fixing ring, a water spraying ring, a nozzle, a first regulating valve and a second regulating valve; the nozzles are uniformly arranged on the nozzle fixing ring, the nozzles are connected with the water spraying ring through a water spraying connecting pipe, and a first regulating valve is arranged on the water spraying connecting pipe; the water spray ring is connected with a water spray main connecting pipe, and a second regulating valve is arranged on the water spray main connecting pipe. And the number of the operation nozzles and the water spraying flow rate are regulated according to the temperature monitoring system of the low-pressure cylinder of the steam turbine, so that the cooling of the low-pressure cylinder of the steam turbine is effectively realized.
Description
Technical Field
The invention relates to a water spraying and cooling system of a power plant, in particular to a water spraying system of a rear cylinder of a low-pressure cylinder of a steam turbine and an adjusting method.
Background
When the steam turbine works, the exhaust temperature in the low-pressure cylinder is strictly limited, the general temperature must be lower than 80 ℃, for example, when the temperature in the low-pressure cylinder is higher than 80 ℃, the temperature of the rear cylinder, the last-stage blade, the next-final-stage blade and the like can be raised, so that certain influence is caused on the safe operation of the unit, and water must be sprayed to the low-pressure cylinder to reduce the exhaust temperature of the low-pressure cylinder. Therefore, the low-pressure cylinder of the steam turbine is provided with a water spraying cooling device. The control mode of the water spray regulating valve of the existing low-pressure cylinder water spray cooling device of the steam turbine is generally full-open and full-closed, namely, the spray nozzle is fully closed or the spray nozzle is fully opened for spraying water; the disadvantage of this mode is that when the temperature gradually decreases, the water spraying flow rate needs to decrease, at this time, the water spraying pressure of the nozzle will be insufficient, and the atomization effect is poor, so that the operation of the steam turbine will be affected, and even accidents will occur in serious cases.
In the prior art: patent one: the Chinese patent with the application number 201710193938.3 discloses a steam turbine extraction condensing back system and an adjusting method thereof, the low-pressure cylinder can be realized without replacing a rotor, the technology can not only maximally increase the external heat supply quantity, but also realize the low-load power generation of a unit with high benefit. And patent II: the Chinese patent publication No. 2017106184159 discloses a low-pressure cylinder cooling steam device and an operation method, so that the cooling of the low-pressure cylinder of the steam turbine in the first patent can be well realized. In order to ensure that the temperature of the low pressure cylinder does not exceed the standard when the steam inlet of the low pressure cylinder is cut off, a cylinder water spraying system still needs to be put into operation. At this time, if water is sprayed at a small flow rate, atomization of the nozzle is often poor, and safety of the last-stage blade and the next-to-last-stage blade is affected, so that safe operation of the steam turbine is seriously affected.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a water spraying system of a rear cylinder of a low-pressure cylinder of a steam turbine, which has reasonable structural design and reliable performance and is used for cooling the low-pressure cylinder of the steam turbine, and an adjusting method.
The invention solves the problems by adopting the following technical scheme: a water spraying system of a rear cylinder of a low-pressure cylinder of a steam turbine comprises a middle-pressure cylinder of the steam turbine, the low-pressure cylinder of the steam turbine and a water spraying device of the rear cylinder; the device is characterized in that a steam outlet of the middle pressure cylinder of the steam turbine is connected with a steam inlet of the low pressure cylinder of the steam turbine through a communicating pipe, and an LCV valve is arranged on the communicating pipe; the rear cylinder water spraying device comprises a low-pressure cylinder rear cylinder, a nozzle fixing ring, a water spraying ring, a nozzle, a first regulating valve and a second regulating valve; the spray nozzles are uniformly arranged on the spray nozzle fixing ring, the spray nozzles are connected with the spray nozzle ring through a water spray connecting pipe, and a first regulating valve is arranged on the water spray connecting pipe; the water spray ring is connected with a water spray main connecting pipe, and a second regulating valve is arranged on the water spray main connecting pipe. The nozzles are uniformly distributed at the steam outlet of the last-stage moving blade of the low-pressure cylinder of the steam turbine for one circle, and the nozzles are deviated from the last-stage moving blade to uniformly spray water around the rear cylinder of the low-pressure cylinder.
Preferably, the nozzles according to the present invention are divided into N groups, each group of nozzles is connected to the spray ring through an independent spray connection pipe, and independent first regulating valves are installed on the spray connection pipes, and may be all or part of the spray connection pipes are respectively installed with independent first regulating valves.
Preferably, the nozzles are uniformly distributed at the steam outlet of the last-stage moving blade of the low-pressure cylinder of the steam turbine, and the nozzles are arranged in a circle.
Preferably, each water spraying connecting pipe is connected with a plurality of nozzles, the structural design of the nozzles is reasonable, and the water spraying range of the nozzles is wide.
Preferably, the nozzles are provided with 12, the nozzles are divided into 3 groups, the first group including 3 nozzles, the second group including 4 nozzles, and the third group including 5 nozzles.
Preferably, the number of the nozzles is 8, the nozzles are divided into 4 groups, each group comprises 2 nozzles, and the 2 nozzles in the same group are symmetrically distributed.
Preferably, the number of the nozzles is 16, the nozzles are divided into 8 groups, each group comprises 2 nozzles, and the 2 nozzles in the same group are symmetrically distributed.
The grouping mode of the nozzles can be determined according to the needs, and the application range is wide.
Preferably, the water inlet end of the water spraying main connecting pipe is connected with a power plant condensate system or a power plant demineralized water system. The plant condensate system and the plant demineralized water system provide a water source for the nozzle water spray.
Preferably, the first regulating valve and the second regulating valve each have a regulating function and a shut-off function.
Preferably, the heating system further comprises a heating steam extraction pipe and a steam pipeline, wherein one end of the heating steam extraction pipe is connected with the communicating pipe, the other end of the heating steam extraction pipe is connected to a heat user, and a heating valve is arranged on the heating steam extraction pipe; one end of the cooling steam pipeline is connected with the communicating pipe, the other end of the cooling steam pipeline is connected with the low-pressure cylinder of the steam turbine, and the cooling steam pipeline is sequentially provided with a regulating valve, a temperature and pressure reducing device and a stop valve. And the low-pressure cylinder cooling device is used for cutting off the steam inlet of the low-pressure cylinder and supplying heat.
A method for adjusting a water spraying system of a rear cylinder of a low-pressure cylinder of a steam turbine, which is characterized by comprising the following steps:
According to the temperature value T Measurement of displayed by the temperature monitoring system of the low-pressure cylinder of the steam turbine, when the displayed temperature value T Measurement of exceeds the safe temperature value T Safety device , the temperature of the low-pressure cylinder of the steam turbine is too high, and a cylinder water spraying device after operation is needed;
The first regulating valve and the second regulating valve are opened, and cooling water from a condensation water system of a power plant or a demineralized water system of the power plant is sprayed to the periphery of a rear cylinder of the low-pressure cylinder uniformly through a nozzle, so that the temperature of the low-pressure cylinder of the steam turbine is reduced;
At this time, the number of the opened first regulating valves is equal to and is satisfied;
In this process, the value of M is gradually decreased as the display temperature value T Measurement of gradually decreases.
Preferably, the opening number M of the first regulating valve is determined according to the magnitude of the temperature difference Δt= (T Measurement of -T Safety device ).
The quantity of the first regulating valves is determined to be opened according to the difference of the display temperature values T Measurement of , the working efficiency is high, the water spraying and cooling effects are good, and the water resource utilization rate is high.
Compared with the prior art, the invention has the following advantages and positive effects: (1) The invention has reasonable design, simple structure and reliable performance, and can adjust the water spraying flow of the rear cylinder according to the temperature monitoring system of the low-pressure cylinder of the steam turbine, thereby effectively realizing the cooling of the low-pressure cylinder of the steam turbine; (2) The invention also realizes that the rear cylinder water spraying device can still ensure that the nozzle has higher atomization effect when spraying water with small flow, and improves the operation safety of the steam turbine.
Drawings
FIG. 1 is a schematic diagram of a low pressure cylinder rear cylinder water spray system and an adjusting method of a steam turbine in an embodiment of the invention.
FIG. 2 is a schematic cross-sectional view of a rear cylinder water jet apparatus in an embodiment of the present invention.
FIG. 3 is a schematic diagram of a heating system for cutting off steam admission of a low pressure cylinder by a rear cylinder water spray system of the low pressure cylinder in an embodiment of the invention.
Fig. 4, 5 and 6 are schematic cross-sectional views of the rear cylinder water spray device uniformly arranging nozzles in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1, a rear cylinder water spray system of a low pressure cylinder of a steam turbine, comprising: a turbine intermediate pressure cylinder 1, a turbine low pressure cylinder 2 and a rear cylinder water spraying device 3; the exhaust port of the middle pressure cylinder 1 of the steam turbine is connected with the steam inlet of the low pressure cylinder 2 of the steam turbine through a communicating pipe 4, and an LCV valve 41 is arranged on the communicating pipe 4.
Referring to fig. 2, the rear cylinder water spray device 3 includes: a low pressure cylinder rear cylinder 31, a nozzle fixing ring 32, a water spraying ring 33, a nozzle 34, a first regulating valve 35 and a second regulating valve 37; the nozzles 34 are uniformly arranged on the nozzle fixing ring 32, and the nozzles 34 uniformly spray water around the rear cylinder 31 of the low-pressure cylinder; the nozzle 34 is connected with the spray ring 33 through a spray connection pipe 36, and a first regulating valve 35 is arranged on the spray connection pipe 36; the spray ring 33 is connected with a spray water total connecting pipe 38, and a second regulating valve 37 is arranged on the spray water total connecting pipe 38; the water inlet end of the water spray main connecting pipe 38 is connected with a power plant condensate system or a power plant demineralized water system.
In this embodiment, the nozzles 34 are uniformly distributed at the steam outlet of the last-stage moving blade of the low-pressure cylinder 2 of the steam turbine, the nozzles 34 are provided with a plurality of nozzles 34, the nozzles 34 are arranged in a circle, and the nozzles 34 are uniformly sprayed with water toward the periphery of the rear cylinder 31 of the low-pressure cylinder away from the last-stage moving blade.
In the present embodiment, the nozzles 34 are divided into N groups, each group of nozzles 34 is connected to the spray ring 33 through an independent spray connection pipe 36, and an independent first regulating valve 35 is installed on the spray connection pipe 36, and the independent first regulating valves 35 may be installed on all or part of the spray connection pipes 36, respectively.
In the present embodiment, both the first regulating valve 35 and the second regulating valve 37 have functions of regulation and shutoff.
In this embodiment, each of the water spraying connection pipes is connected to a plurality of nozzles 34, and the nozzles 34 have reasonable structural design, and the water spraying range of the nozzles 34 is wide.
In this embodiment, the adjustment method of the rear cylinder water spray system of the low pressure cylinder of the steam turbine is as follows:
According to the temperature value T Measurement of displayed by the temperature monitoring system of the low-pressure cylinder 2 of the steam turbine, when the displayed temperature value T Measurement of exceeds the safe temperature value T Safety device , the temperature of the low-pressure cylinder 2 of the steam turbine is too high, and the cylinder water spraying device 3 is required to be put into operation;
at this time, the first regulating valve 35 and the second regulating valve 37 are opened, and the cooling water from the condensate system of the power plant or the demineralized water system of the power plant is sprayed uniformly to the periphery of the rear cylinder 31 of the low pressure cylinder through the nozzle 34, so that the temperature of the low pressure cylinder 2 of the steam turbine is reduced;
at this time, the number of opening first regulating valves 35 is equal to, and satisfied;
in this process, the value of M is gradually reduced as the display temperature value gradually decreases.
In the adjusting method of the present embodiment, the opening number M of the first adjusting valve 35 is determined according to the magnitude of the temperature difference Δt= (T Measurement of -T Safety device ).
FIG. 3 is a schematic illustration of a heating system for a low pressure cylinder rear cylinder water spray system for removing low pressure cylinder steam admission in the present embodiment; at this time, the LCV valve 41 is fully closed, the heating valve 71 is opened, the exhaust steam of the steam turbine intermediate pressure cylinder 1 is not directly fed into the steam turbine low pressure cylinder 2, but the heating steam extraction pipe 7 is used for supplying heat to the external heat user 5; at this time, the regulating valve 61 and the stop valve 63 are opened, the small-flow steam still maintains a certain superheat degree after being subjected to temperature and pressure reduction by the temperature and pressure reduction device 62, and then enters the low-pressure cylinder 2 of the steam turbine to cool the low-pressure cylinder, and the regulating valve 61, the temperature and pressure reduction device 62 and the stop valve 63 are sequentially arranged on the cooling steam pipeline 6; at this time, the rear cylinder water spraying device 3 is put into operation, the first regulating valve 35 and the second regulating valve 37 are opened, and the water for reducing the temperature from the condensation water system of the power plant or the demineralized water system of the power plant is sprayed uniformly to the periphery of the rear cylinder 31 of the low pressure cylinder through the nozzle 34, so that the temperature of the low pressure cylinder 2 of the steam turbine is reduced; at this time, the first regulating valve 35 is opened, wherein; in this process, the value of M is gradually decreased as the display temperature value T Measurement of gradually decreases.
Referring to fig. 4 and 5, a water spraying system for a low pressure cylinder rear cylinder of a steam turbine is provided with nozzles 34 uniformly arranged in the present embodiment, wherein the nozzles 34 are uniformly mounted on a nozzle fixing ring 32, and the nozzles 34 uniformly spray water around the low pressure cylinder rear cylinder 31; the number of the nozzles 34 is equal, and each water spraying connection pipe 36 is connected with two nozzles 34, that is, the nozzles 34 are divided into groups, and the connected two nozzles 34 are symmetrically distributed on the nozzle fixing ring 32; when water spray adjustment is performed, the number of the first adjusting valves 35 opened each time is equal to and satisfied; the index M of the number of the first regulating valves 35 is valued each time, and is determined according to the magnitude of a temperature difference DeltaT= (T Measurement of -T Safety device ); the number of the first regulating valves 35 can ensure that the nozzles 34 in operation are uniformly distributed on the steam outlet of the last-stage moving blade of the low-pressure cylinder 2 of the steam turbine for one circle. While fig. 4 is a schematic view of the rear cylinder water spray device 3 in operation when M is equal to 3, fig. 5 is a schematic view of the rear cylinder water spray device 3 in operation when M is equal to 2.
Referring to fig. 6, another water spraying system for a low pressure cylinder rear cylinder of a steam turbine with nozzles 34 uniformly arranged in this embodiment is shown, in which the nozzles 34 are uniformly mounted on a nozzle fixing ring 32, and the nozzles 34 uniformly spray water around the circumference of the low pressure cylinder rear cylinder 31; the number of nozzles 34 is equal to N, where N is equal to 12; the nozzles 34 are divided into three groups, each group being connected to the spray ring 33 by a separate spray connection pipe 36, and a separate first regulating valve 35 being mounted on each separate spray connection pipe 36. In fig. 6, the number of nozzles 34 in each group is 3, 4, and 5, respectively.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (5)
1. A method for adjusting a rear cylinder water spraying system of a low-pressure cylinder of a steam turbine comprises the steps of a middle pressure cylinder (1) of the steam turbine, a low-pressure cylinder (2) of the steam turbine and a rear cylinder water spraying device (3); the device is characterized in that a steam outlet of the middle pressure cylinder (1) of the steam turbine is connected with a steam inlet of the low pressure cylinder (2) of the steam turbine through a communicating pipe (4), and an LCV valve (41) is arranged on the communicating pipe (4); the rear cylinder water spraying device (3) comprises a low-pressure cylinder rear cylinder (31), a nozzle fixing ring (32), a water spraying ring (33), a nozzle (34), a first regulating valve (35) and a second regulating valve (37); the plurality of nozzles (34) are arranged, the nozzles (34) are uniformly arranged on the nozzle fixing ring (32), the nozzles (34) are connected with the water spraying ring (33) through water spraying connecting pipes (36), and the water spraying connecting pipes (36) are provided with first regulating valves (35); the water spraying ring (33) is connected with a water spraying main connecting pipe (38), and a second regulating valve (37) is arranged on the water spraying main connecting pipe (38); the nozzles (34) are divided into N groups, each group of nozzles (34) is connected with a water spraying ring (33) through an independent water spraying connecting pipe (36), and an independent first regulating valve (35) is arranged on the water spraying connecting pipe (36); the nozzles (34) are uniformly distributed at steam outlets of last-stage moving blades of the low-pressure cylinder (2) of the steam turbine, and the nozzles (34) are arrayed into a circle;
the adjusting method comprises the following steps:
According to the temperature value T Measurement of displayed by the temperature monitoring system of the low-pressure cylinder (2) of the steam turbine, when the displayed temperature value T Measurement of exceeds the safe temperature value T Safety device , the temperature of the low-pressure cylinder (2) of the steam turbine is too high, and the cylinder water spraying device (3) is put into operation;
The first regulating valve (35) and the second regulating valve (37) are opened, and cooling water from a condensation water system of a power plant or a demineralized water system of the power plant is sprayed to the periphery of the rear cylinder (31) of the low-pressure cylinder uniformly through the nozzle (34), so that the temperature of the low-pressure cylinder (2) of the steam turbine is reduced;
at the moment, the number of the first regulating valves (35) is equal to M, and M is less than or equal to N;
in the process, the value of M is gradually reduced along with the gradual reduction of the display temperature value T Measurement of ;
The opening number M of the first regulating valve (35) takes a value which is determined according to the magnitude of a temperature difference DeltaT= (T Measurement of -T Safety device ).
2. The method for regulating a rear cylinder water spray system of a low pressure cylinder of a steam turbine according to claim 1, wherein the water inlet end of the water spray main connecting pipe (38) is connected with a condensate system of a power plant or a demineralized water system of the power plant.
3. The method for adjusting a low pressure cylinder-rear cylinder water injection system of a steam turbine according to claim 1, wherein 12 nozzles (34) are provided, the nozzles (34) are divided into 3 groups, the first group includes 3 nozzles (34), the second group includes 4 nozzles (34), and the third group includes 5 nozzles (34).
4. The method for adjusting a water injection system of a rear cylinder of a low pressure cylinder of a steam turbine according to claim 1, wherein 8 nozzles (34) are provided, the nozzles (34) are divided into 4 groups, each group comprises 2 nozzles (34), and the 2 nozzles (34) in the same group are symmetrically distributed.
5. The method for adjusting a water injection system of a rear cylinder of a low pressure cylinder of a steam turbine according to claim 1, wherein 16 nozzles (34) are provided, the nozzles (34) are divided into 8 groups, each group comprises 2 nozzles (34), and the 2 nozzles (34) in the same group are symmetrically distributed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711203739.2A CN107956519B (en) | 2017-11-27 | 2017-11-27 | Water spraying system for rear cylinder of low-pressure cylinder of steam turbine and adjusting method |
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| CN201711203739.2A CN107956519B (en) | 2017-11-27 | 2017-11-27 | Water spraying system for rear cylinder of low-pressure cylinder of steam turbine and adjusting method |
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| CN107956519B true CN107956519B (en) | 2024-04-19 |
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| CN112503960A (en) * | 2020-11-09 | 2021-03-16 | 华能巢湖发电有限责任公司 | Steam-water recovery and low-pressure cylinder water spraying system for condenser |
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