CN105317474A - Power plant system with additional steam turbine and variable frequency auxiliary machines and control method - Google Patents
Power plant system with additional steam turbine and variable frequency auxiliary machines and control method Download PDFInfo
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- CN105317474A CN105317474A CN201510539447.0A CN201510539447A CN105317474A CN 105317474 A CN105317474 A CN 105317474A CN 201510539447 A CN201510539447 A CN 201510539447A CN 105317474 A CN105317474 A CN 105317474A
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Abstract
The invention relates to a power plant system with an additional steam turbine and variable frequency auxiliary machines and a control method. Systems and control methods similar to the power plant system and the control method which greatly improve power generating efficiency are absent at present. The system comprises an auxiliary machine equipment cluster, and is characterized in that the system further comprises the additional steam turbine, a power generator, a transformer, an auxiliary machine busbar, a steam turbine speed adjusting device and a distributed control system (DCS); the steam turbine speed adjusting device is connected with the additional steam turbine; the transformer is connected with the auxiliary machine busbar; the auxiliary machine busbar is connected with the auxiliary machine equipment cluster. The control method includes the steps that the DCS generates a proper control instruction according to current load information of a thermal power generating unit and variable frequency voltage value required by the auxiliary machine equipment cluster; the control instruction acts on the inside of the steam turbine speed adjusting device; and 20-50HZ voltage is generated through the power generator and the transformer and directly transmitted to all auxiliary machine equipment in the auxiliary machine equipment cluster through the auxiliary machine busbar. According to the power plant system with the additional steam turbine and the variable frequency auxiliary machines and the control method, the structural design is reasonable, and power generating efficiency is greatly improved.
Description
Technical field
The present invention relates to a kind of power plant and add steam turbine band Frequency auxiliary system and controlling method, be mainly used in power plant, utilize auxiliary vapour to generate electricity for station service, and the existing multiple frequency conversion subsidiary engine operation of variable-frequency electric compacting can be produced.
Background technique
Present country requires to thermal power generation corporations the generating efficiency as far as possible improving unit, reaches certain energy-saving and emission-reduction requirement simultaneously, and the cycling and reutilization particularly reducing station-service Generation Rate working medium relevant with generator set will have very large prospect.
The system also having steam turbine energy recovery to utilize now, if publication date is on 01 25th, 2012, publication number is in the Chinese patent of CN102330579A, disclosing a kind of thermoelectricity plant reclaims main, waste condensation heat of auxiliary turbine combined heating system, this thermoelectricity plant reclaims main, waste condensation heat of auxiliary turbine combined heating system comprises sucking condensing turbine, main steam turbine extraction steam pipe, first water-cooled condenser, auxiliary steam turbine, second water-cooled condenser, water water-to-water heat exchanger, subcooler, vapor-water heat exchanger and absorption heat pump, heat supply network backwater is divided into two tunnels before or after entering water water-to-water heat exchanger, each absorption heat pump (XR1 is connected in series after one road heat supply network backwater is introduced into the adsorber of First absorption heat pump (XR1) ... n), the condenser of this n-th absorption heat pump is entered again after going out the adsorber of n-th absorption heat pump (XRn), then the condenser of series connection access each absorption heat pump, another road heat supply network backwater parallel connection enters the subcooler (9) of each absorption heat pump, after two road heat supply network backwater finally merge, directly or after heating again send, this system is only for reclaiming the condensation waste heat of Geng Duo thermoelectricity plant, do not possess with waste-heat power generation, and electric energy is used for the function of power plant's electricity consumption.
Also do not have a kind of reasonable in design at present, steam turbine band Frequency auxiliary system and controlling method are added by reliable performance, power plant that is energy-saving and cost-reducing, that significantly improve generating efficiency.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of reasonable in design, steam turbine band Frequency auxiliary system and controlling method are added by reliable performance, power plant that is energy-saving and cost-reducing, that significantly improve generating efficiency.
The present invention's adopted technological scheme that solves the problem is: this power plant adds steam turbine band Frequency auxiliary system and comprises subsidiary engine device cluster, its structural feature is: also comprise the additional steam turbine that the auxiliary vapour utilizing power plant's main steam turbine to produce carries out doing work, the generator generated electricity is carried out by additional steam turbine acting, voltage transition for being exported by generator becomes frequency to be the transformer of 20HZ ~ 50HZ, frequency for being exported by transformer is the subsidiary engine bus that the voltage of 20HZ ~ 50HZ directly flows to subsidiary engine device cluster, for regulating the steam turbine speed control device of additional steam turbine power and rotating speed, and the DCS control system of steam turbine speed control device is controlled according to the feedback information of subsidiary engine device cluster and steam turbine speed control device, described steam turbine speed control device is connected with additional steam turbine, described additional steam turbine is connected with generator, described generator is connected with transformer, described transformer is connected with subsidiary engine bus, described subsidiary engine bus is connected with subsidiary engine device cluster, and described subsidiary engine device cluster is all connected with DCS control system with steam turbine speed control device.
As preferably, additional steam turbine of the present invention is the adjustable steam turbine of rotating speed.
As preferably, subsidiary engine bus of the present invention is variable ratio frequency changer subsidiary engine bus.
As preferably, subsidiary engine device cluster of the present invention is variable speed subsidiary engine device cluster.
The controlling method of steam turbine band Frequency auxiliary system is added by a kind of described power plant, its feature is: the step of this controlling method is as follows: DCS control system frequency conversion magnitude of voltage needed for fired power generating unit information on load at that time and subsidiary engine device cluster produces a suitable control command, this control command is acted in steam turbine speed control device, for controlling the auxiliary steam flow amount entered in additional steam turbine, make corresponding auxiliary vapour enter additional steam turbine to do work and the rotating speed producing 1200 revs/min ~ 3000 revs/min, then producing frequency by generator and transformer is the voltage of 20HZ ~ 50HZ, this voltage directly flows to each subsidiary engine equipment in subsidiary engine device cluster by subsidiary engine bus, each subsidiary engine equipment exerts oneself each working medium requirement maintaining unit accordingly, in above process, DCS control system constantly receives the state feedback information of each subsidiary engine equipment in steam turbine speed control device and subsidiary engine device cluster, and the workload demand of the feedback information obtained with fired power generating unit is at that time contrasted, continuous generation adjustment signal, and adjustment signal is directly acted on steam turbine speed control device, thus form a closed loop automatic control system completely.
As preferably, the present invention requires by after the computing of DCS control system according to the varying load condition of fired power generating unit, controls steam turbine speed control device, realizes the adjustment of additional steam turbine power and rotating speed.
As preferably, the auxiliary vapour that the present invention realizes utilizing power plant's main steam turbine to produce drives additional steam turbine acting, subsidiary engine equipment in the variable-frequency electric pressure Direct driver subsidiary engine device cluster produced, reach and realize without frequency variator the object that the frequency conversion of subsidiary engine equipment exerts oneself, subsidiary engine equipment high efficiency is run, the auxiliary vapour simultaneously finishing merit in additional steam turbine still for for heat utilization, to reduce station service power consumption rate, improve unit whole efficiency and realize reusing of energy source.
As preferably, suitable control command of the present invention refer to meet fired power generating unit normally run and subsidiary engine device cluster normally runs time control command.
The present invention compared with prior art, has the following advantages and effect:
1, can Efficient Cycle recycle the acting of original main frame after be pooled to high pressure-temperature vapour source in auxiliary vapour header, realize the generating of auxiliary vapour recycling for after station service, enter heating system again, fully again utilize the High Temperature High Pressure energy in auxiliary vapour, achieve the cascade utilization of the auxiliary vapour energy.
2, expense is low, significantly can save and often overlap the huge installation cost that configuration frequency variator bought by frequency conversion subsidiary engine, it also avoid the frequency conversion Installation and Debugging expense of later stage costliness and frequency conversion equipment maintenance cost etc. simultaneously.
3, structure is simple, design is unique, it is convenient to implement, the variable-frequency electric compacting being conducive to being produced by the present invention is now with multiple frequency conversion subsidiary engine to run, thus significantly reduce station service power consumption rate, simultaneously can the consumption of saving electric energy effectively and reasonably by subsidiary engine converting operation, and significantly improve the generating efficiency of unit.
4, because the present invention also can include DCS system overall-in-one control schema in, therefore DCS system associated control logic also can more effectively control effectively to dispatch to omnidistance unit load, and responsive electricity grid is to the load variations requirement of unit more fast.
Accompanying drawing explanation
Fig. 1 is the structural representation that in the embodiment of the present invention, steam turbine band Frequency auxiliary system adds in power plant.
In figure: 1, additional steam turbine; 2, generator; 3, transformer; 4, subsidiary engine bus; 5, subsidiary engine device cluster; 6, DCS control system; 7, steam turbine speed control device.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1, power plant in the present embodiment adds steam turbine band Frequency auxiliary system and comprises subsidiary engine device cluster 5, the auxiliary vapour utilizing power plant's main steam turbine to produce carries out the additional steam turbine 1 done work, the generator 2 generated electricity is carried out by additional steam turbine 1 acting, voltage transition for being exported by generator 2 becomes frequency to be the transformer 3 of 20HZ ~ 50HZ, frequency for being exported by transformer 3 is the subsidiary engine bus 4 that the voltage of 20HZ ~ 50HZ directly flows to subsidiary engine device cluster 5, for regulating the steam turbine speed control device 7 of additional steam turbine 1 power and rotating speed, and the DCS control system 6 of steam turbine speed control device 7 is controlled according to the feedback information of subsidiary engine device cluster 5 and steam turbine speed control device 7.
Steam turbine speed control device 7 in the present embodiment is connected with additional steam turbine 1, additional steam turbine 1 is connected with generator 2, generator 2 is connected with transformer 3, transformer 3 is connected with subsidiary engine bus 4, subsidiary engine bus 4 is connected with subsidiary engine device cluster 5, and subsidiary engine device cluster 5 is all connected with DCS control system 6 with steam turbine speed control device 7.
Under normal circumstances, the additional steam turbine 1 in the present embodiment is the adjustable steam turbine of rotating speed, and subsidiary engine bus 4 is variable ratio frequency changer subsidiary engine bus, and subsidiary engine device cluster 5 is variable speed subsidiary engine device cluster.
In the present embodiment power plant to add the step of the controlling method of steam turbine band Frequency auxiliary system as follows: DCS control system 6 frequency conversion magnitude of voltage needed for fired power generating unit information on load at that time and subsidiary engine device cluster 5 produces a suitable control command, this control command is acted in steam turbine speed control device 7, for controlling the auxiliary steam flow amount entered in additional steam turbine 1, make corresponding auxiliary vapour enter additional steam turbine 1 to do work and the rotating speed producing 1200 revs/min ~ 3000 revs/min, then produce by generator 2 and transformer 3 voltage that frequency is 20HZ ~ 50HZ, this voltage directly flows to each subsidiary engine equipment in subsidiary engine device cluster 5 by subsidiary engine bus 4, each subsidiary engine equipment exerts oneself each working medium requirement maintaining unit accordingly, in above process, DCS control system 6 constantly receives the state feedback information of each subsidiary engine equipment in steam turbine speed control device 7 and subsidiary engine device cluster 5, and the workload demand of the feedback information obtained with fired power generating unit is at that time contrasted, continuous generation adjustment signal, and adjustment signal is directly acted on steam turbine speed control device 7, thus form a closed loop automatic control system completely.
The present embodiment requires by after DCS control system 6 computing according to the varying load condition of fired power generating unit, controls steam turbine speed control device 7, realizes the adjustment of additional steam turbine 1 power and rotating speed.
The auxiliary vapour that the present embodiment realizes utilizing power plant's main steam turbine to produce drives additional steam turbine 1 to do work, subsidiary engine equipment in the variable-frequency electric pressure Direct driver subsidiary engine device cluster 5 produced, reach and realize without frequency variator the object that the frequency conversion of subsidiary engine equipment exerts oneself, subsidiary engine equipment high efficiency is run, the auxiliary vapour simultaneously finishing merit in additional steam turbine 1 still for for heat utilization, to reduce station service power consumption rate, improve unit whole efficiency and realize reusing of energy source.
Control command suitable in the present embodiment refer to meet fired power generating unit normally run and subsidiary engine device cluster 5 normally runs time control command, this is common practise to those skilled in the art.
Containing the control logic to steam turbine speed control device 7 in the present embodiment DCS control system 6, the varying load condition according to fired power generating unit requires by after the computing of DCS control logic, controls steam turbine speed control device 7, realizes the power to additional steam turbine 1 and rotational speed regulation.Produce by generator 2 and transformer 3 the frequency conversion voltage that frequency is 20HZ to 50HZ after the rotating speed of acting generation 1200 revs/min to 3000 revs/min after auxiliary vapour enters additional steam turbine 1, relevant frequency conversion voltage is directly supplied to subsidiary engine device cluster 5 by subsidiary engine bus 4 and powers, and makes relevant device meet the normal economical operation demand of unit.
In addition, it should be noted that, the specific embodiment described in this specification, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this specification is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (8)
1. steam turbine band Frequency auxiliary system adds in a power plant, comprise subsidiary engine device cluster (5), it is characterized in that: also comprise the additional steam turbine (1) that the auxiliary vapour utilizing power plant's main steam turbine to produce carries out doing work, the generator (2) generated electricity is carried out by additional steam turbine (1) acting, voltage transition for being exported by generator (2) becomes frequency to be the transformer (3) of 20HZ ~ 50HZ, frequency for being exported by transformer (3) is the subsidiary engine bus (4) that the voltage of 20HZ ~ 50HZ directly flows to subsidiary engine device cluster (5), for regulating the steam turbine speed control device (7) of additional steam turbine (1) power and rotating speed, and the DCS control system (6) of steam turbine speed control device (7) is controlled according to the feedback information of subsidiary engine device cluster (5) and steam turbine speed control device (7), described steam turbine speed control device (7) is connected with additional steam turbine (1), described additional steam turbine (1) is connected with generator (2), described generator (2) is connected with transformer (3), described transformer (3) is connected with subsidiary engine bus (4), described subsidiary engine bus (4) is connected with subsidiary engine device cluster (5), and described subsidiary engine device cluster (5) is all connected with DCS control system (6) with steam turbine speed control device (7).
2. steam turbine band Frequency auxiliary system adds in power plant according to claim 1, it is characterized in that: described additional steam turbine (1) is the adjustable steam turbine of rotating speed.
3. steam turbine band Frequency auxiliary system adds in power plant according to claim 1, it is characterized in that: described subsidiary engine bus (4) is variable ratio frequency changer subsidiary engine bus.
4. steam turbine band Frequency auxiliary system adds in power plant according to claim 1, it is characterized in that: described subsidiary engine device cluster (5) is variable speed subsidiary engine device cluster.
5. the controlling method of steam turbine band Frequency auxiliary system is added by the power plant as described in a claim as arbitrary in claim 1-4, it is characterized in that: the step of this controlling method is as follows: DCS control system (6) frequency conversion magnitude of voltage needed for fired power generating unit information on load at that time and subsidiary engine device cluster (5) produces a suitable control command, this control command is acted in steam turbine speed control device (7), for controlling the auxiliary steam flow amount entered in additional steam turbine (1), make corresponding auxiliary vapour enter additional steam turbine (1) to do work and the rotating speed producing 1200 revs/min ~ 3000 revs/min, then producing frequency by generator (2) and transformer (3) is the voltage of 20HZ ~ 50HZ, this voltage directly flows to each subsidiary engine equipment in subsidiary engine device cluster (5) by subsidiary engine bus (4), each subsidiary engine equipment exerts oneself each working medium requirement maintaining unit accordingly, in above process, DCS control system (6) constantly receives the state feedback information of each subsidiary engine equipment in steam turbine speed control device (7) and subsidiary engine device cluster (5), and the workload demand of the feedback information obtained with fired power generating unit is at that time contrasted, continuous generation adjustment signal, and adjustment signal is directly acted on steam turbine speed control device (7), thus form a closed loop automatic control system completely.
6. steam turbine band Frequency subsidiary engine controlling method is added by power plant according to claim 5, it is characterized in that: the varying load condition according to fired power generating unit requires by after DCS control system (6) computing, control steam turbine speed control device (7), realize the adjustment of additional steam turbine (1) power and rotating speed.
7. steam turbine band Frequency subsidiary engine controlling method is added by power plant according to claim 5, it is characterized in that: the auxiliary vapour realizing utilizing power plant's main steam turbine to produce drives additional steam turbine (1) acting, subsidiary engine equipment in variable-frequency electric pressure Direct driver subsidiary engine device cluster (5) produced, reach and realize without frequency variator the object that the frequency conversion of subsidiary engine equipment exerts oneself, subsidiary engine equipment high efficiency is run, the auxiliary vapour simultaneously finishing merit in additional steam turbine (1) still for for heat utilization, to reduce station service power consumption rate, improve unit whole efficiency and realize reusing of energy source.
8. steam turbine band Frequency subsidiary engine controlling method is added by power plant according to claim 5, it is characterized in that: described suitable control command refer to meet fired power generating unit normally run and subsidiary engine device cluster (5) normally runs time control command.
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| CN106285918A (en) * | 2016-10-13 | 2017-01-04 | 福州大学 | Bi-motor turbocharging power generation device and control method thereof |
| CN106849091A (en) * | 2017-03-24 | 2017-06-13 | 上海申能电力科技有限公司 | It is a kind of to realize novel system, method and application that electric energy conversion switches with motor |
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| CN106849091A (en) * | 2017-03-24 | 2017-06-13 | 上海申能电力科技有限公司 | It is a kind of to realize novel system, method and application that electric energy conversion switches with motor |
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| CN105317474B (en) | 2017-06-06 |
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