CN113464225A - System and method for wide load operation of power plant with two-stage steam ejector - Google Patents
System and method for wide load operation of power plant with two-stage steam ejector Download PDFInfo
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- CN113464225A CN113464225A CN202110758561.8A CN202110758561A CN113464225A CN 113464225 A CN113464225 A CN 113464225A CN 202110758561 A CN202110758561 A CN 202110758561A CN 113464225 A CN113464225 A CN 113464225A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a system and a method for wide-load operation of a power plant with two stages of steam ejectors, wherein the system is coupled with a steam supply and heating system under a conventional thermal power generating unit, and meets the requirements of industrial steam supply and heating steam by extracting steam from different steam extraction ports of the steam turbine unit, arranging a primary steam ejector power steam pipeline regulating valve, a primary steam ejector steam extraction pipeline regulating valve, a secondary steam ejector power steam pipeline regulating valve and a secondary steam ejector steam extraction pipeline regulating valve, and switching primary and secondary ejection steam sources when the wide-range load of the power plant is changed; meanwhile, the power steam source of the primary steam ejector is main steam, so that the adjustable range of industrial steam is larger; in addition, the two-stage steam ejector can utilize steam of different grades to a greater extent under the condition of ensuring the stability of a steam supply and heating system, so that the cascade utilization of energy is realized. Therefore, the system has a remarkable effect on energy conservation and emission reduction.
Description
Technical Field
The invention relates to a system and a method for wide-load operation of a power plant with two stages of steam ejectors, in particular to a combined system and an operation method of a conventional thermal power generating unit and a heat and steam supply system with two stages of steam ejectors.
Background
In recent years, with the acceleration of urbanization process in China, the demands for urban central heating and industrial steam supply are exponentially increased. More and more hot spot co-production units with large capacity and high parameters are put into operation. The waste heat of the unit in the power generation process is utilized to supply heat, and the energy utilization efficiency of the pure condensation thermal power plant can be improved, so that the loss of a cold source is reduced, and the cascade utilization of energy is realized. In the industrial field, along with the steam demand of the industry, the combined heat and steam supply of the thermal power generating unit has become a common solution, and when the thermal power generating plant generates excessive steam, the steam can be extracted for the use of industrial steam and heating heat load. In the combined heat and steam supply system of the thermal power generating unit, the steam ejector plays an important role, and the steam ejector can solve the problem that the steam parameters of industrial steam and heating diameter are different. According to the traditional method, a temperature and pressure reducing device is used, and after a steam ejector is used, a part of low-temperature low-pressure steam can be ejected by high-pressure high-temperature steam of a department, so that the temperature and the pressure of mixed steam are increased, the requirements of industry and heating are met, and the purpose of energy conservation is further achieved.
The single-stage steam ejector uses main steam of a power plant as power steam to eject hot-end steam, and an outlet of the single-stage steam ejector is used for industrial steam supply or steam supply; although the single-stage steam ejector can meet the steam requirements of a thermal power plant unit and a heat and steam supply system, the cascade utilization of energy cannot be well realized. In an industrial steam system, a temperature and pressure reducing valve is generally adopted in the traditional method, so that the waste of steam grade is large; meanwhile, the flexibility of cogeneration is not good enough, when the thermal power plant operates at low load, the performance of steam injection is deteriorated, and the injection coefficient is reduced, so that the normal operation of a heat supply and steam supply system is influenced.
Disclosure of Invention
The invention aims to solve the defects of the existing operation scheme and provides a combined heat and power generation system coupled with a heating steam supply system and an operation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a power plant wide-load operation system with two-stage steam ejectors comprises a steam generator 1, a first stage 2 of a steam turbine set, a second stage 3 of the steam turbine set, a third stage 4 of the steam turbine set, a fourth stage 5 of the steam turbine set, a fifth stage 6 of the steam turbine set, a sixth stage 7 of the steam turbine set, a heat regenerator 8, a deaerator 9, a water feed pump 10, a condenser 11 of a power plant, a condensate pump 12, a first-stage steam ejector injection steam extraction pipeline regulating valve 101, a second-stage steam ejector injection steam extraction bypass regulating valve 102, a second-stage steam ejector injection steam extraction pipeline regulating valve 103, a first-stage steam ejector injection steam extraction bypass regulating valve 104, a heating steam bypass regulating valve 105, an industrial steam extraction pipeline regulating valve 106, an industrial steam pressure reducing valve 107, a first-stage steam ejector power steam pipeline regulating valve 108, a second-stage steam ejector power steam pipeline regulating valve 109, a steam ejector power steam ejector bypass regulating valve 104, a steam ejector power supply bypass regulating valve, An industrial steam main pipe regulating valve 110, a heating steam regulating valve 111, a primary steam ejector 201, a secondary steam ejector 202, an industrial steam main pipe 203 and a heating heat exchanger 204;
the main steam outlet of the steam generator 1 is connected with the inlets of the first stage 2 and the second stage 3 of the steam turbine set in series, the exhaust outlet of the second stage 3 of the steam turbine set is connected with the reheat steam inlet of the steam generator 1, the reheat steam outlet of the steam generator 1 is connected with the inlets of the third stage 4 of the steam turbine set, the fourth stage 5 of the steam turbine set, the fifth stage 6 of the steam turbine set, the sixth stage 7 of the steam turbine set and other steam turbine stages in series, the outlet of the last stage of the steam turbine set is connected with the condenser 11 of the electric power plant, the condensate pump 12, four heat regenerators, the deaerator 9, the feed pump 10 and three heat regenerators in series, and the feed water outlet of the last heat regenerator 8 of the three heat regenerators is connected with the feed water inlet of the steam generator 1; the main steam outlet of the steam generator 1 is sequentially communicated with the power steam pipeline regulating valve 108 of the primary steam ejector and the power steam inlet pipeline of the primary steam ejector 201; the main steam outlet of the steam generator 1 is also communicated with an industrial steam extraction pipeline regulating valve 106, an industrial steam pressure reducing valve 107 and an industrial steam main pipe 203 in sequence; an injection steam inlet of the primary steam ejector 201 is directly communicated with a steam extraction port of the second stage 3 of the steam turbine set through an injection steam extraction pipeline regulating valve 101 of the primary steam ejector, and an injection steam inlet of the primary steam ejector 201 is also directly communicated with a steam extraction port of the first stage 2 of the steam turbine set through an injection steam extraction bypass regulating valve 104 of the primary steam ejector; the outlet of the primary steam ejector 201 is directly communicated with the industrial steam main pipe regulating valve 110 and the industrial steam main pipe 203; the outlet of the primary steam ejector 201 is also communicated with the power steam inlet pipeline of the secondary steam ejector power steam regulating valve 109 and the secondary steam ejector 202; an injection steam inlet of the second-stage steam ejector 202 is communicated with the extraction opening of the sixth stage 7 of the steam turbine set through the injection steam extraction pipeline regulating valve 103 of the second-stage steam ejector, and an injection steam inlet of the second-stage steam ejector 202 is communicated with the extraction opening of the fifth stage 6 of the steam turbine set through the injection steam extraction bypass regulating valve 102 of the second-stage steam ejector; the outlet steam of the secondary steam ejector 202 is communicated with the heating heat exchanger 204 through the heating steam adjusting valve 111; further, the steam extraction port of the fourth stage 5 of the steam turbine unit communicates with the heating heat exchanger 204 through the heating steam bypass adjustment valve 105 and the heating steam adjustment valve 111.
According to the power plant wide-load operation coupling heating and steam supply system with the two-stage steam ejector, when the load of a thermal power plant changes in a large range, the working states of each steam source and the steam ejector 201 and the second-stage steam ejector 202 are flexibly switched by setting the opening of each steam pipeline adjusting valve, on the premise that the coupled heating and steam supply system works normally, low-grade energy is utilized to a higher degree, the purpose of gradient utilization of energy is achieved, and the purposes of energy conservation and emission reduction are achieved.
The power steam of the primary steam ejector 201 comes from the main steam, so the adjustable range of the outlet steam pressure of the primary steam ejector 201 is 4-24MPa, and the adjustable range of the industrial steam is larger.
The injection steam source of the first-stage steam ejector 201 is adjustable, injection steam is injected through the first-stage steam ejector to inject the steam extraction pipeline regulating valve 101 and the first-stage steam ejector to inject the steam extraction bypass regulating valve 104 to switch, steam supply is met, meanwhile, low-grade steam sources are utilized by switching according to different loads of a power plant, and the purpose of energy conservation is achieved by utilizing the steam of different grades.
The secondary steam ejector 202 can adjust the ejection steam source, ejection steam is ejected through the secondary steam ejector to eject the steam extraction pipeline regulating valve 103 and the secondary steam ejector to eject the steam extraction bypass regulating valve 102 to switch, low-grade steam sources are utilized by switching according to different loads of a power plant while steam supply is met, and the purpose of energy conservation is achieved by utilizing steam of different grades.
The industrial steam main pipe 203 is directly obtained from a main steam pipeline of a main steam outlet of the steam generator 1 through the industrial steam extraction pipeline regulating valve 106 and the industrial steam pressure reducing valve 107, so that the pressure adjustable range of the industrial steam is wider.
The steam source for heating of the heating heat exchanger 204 can be switched between the steam extraction port of the fourth stage 5 of the steam turbine set and the outlet of the second-stage steam ejector 202, low-grade steam sources are utilized by switching according to different loads of a power plant, and the purpose of energy saving is achieved by utilizing steam of different grades.
The operation method of the power plant wide-load operation system with the two-stage steam ejector comprises a power plant high-load operation mode, a power plant medium-load operation mode and a power plant low-load operation mode, and specifically comprises the following steps:
operating mode under high load of power plant: when the power plant operates under high load, namely above 75% load of a 350MW unit, the primary steam ejector 201 and the secondary steam ejector 202 are both in working states; the primary steam ejector 201 extracts main steam generated by the steam generator 1 and injects the extracted steam of the second stage 3 of the steam turbine set; at the moment, the power steam pipeline regulating valve 108 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction bypass regulating valve 104 of the primary steam ejector is closed, and a bypass pipeline is cut off; at the moment, the industrial steam extraction pipeline regulating valve 106 is closed, the pipeline connection with the steam generator 1 is cut off, the industrial steam main pipe regulating valve 110 is opened, the valve opening degree is regulated according to the steam consumption requirement, and the flow control of industrial steam supply is realized; the power steam pipeline regulating valve 109 of the secondary steam ejector is opened, the secondary steam ejector injects the steam extraction bypass regulating valve 102 to be closed, the connection with the steam extraction bypass of the fifth stage 6 of the steam turbine is cut off, the secondary steam ejector injects the steam extraction pipeline regulating valve 103 to be opened, the outlet steam of the primary steam ejector 201 is used as the power steam of the secondary steam ejector 202, the steam extraction pipeline injects the steam extraction of the sixth stage 7 of the steam turbine unit through the secondary steam ejector, the outlet steam is used as heating steam to enter the heating heat exchanger 204, the heating steam regulating valve 111 is opened at the moment, the heating steam bypass regulating valve 105 is closed, and the control of heating heat load is realized through the regulation of the heating steam regulating valve 111;
operating mode under load in the power plant: when the power plant operates under a medium load, namely 50-75% THA load of 350MW steam turbine units, steam parameters of steam extraction ports of the steam turbine units of the power plant are reduced under the condition, at the moment, outlet steam parameters of the steam extraction ports of the second stage 3 of the steam turbine units, which are injected by the first-stage steam injector 201 and mixed with the extracted steam, cannot meet the requirement of industrial steam, so that the regulating valve 101 of the injection steam extraction pipeline of the first-stage steam injector is closed, the regulating valve 104 of the injection steam extraction bypass of the first-stage steam injector is opened, the amount of the extracted steam is controlled by controlling the opening degree of the valve, and the requirement of the industrial steam is met; meanwhile, the outlet steam parameters of the second-stage steam ejector 202 for ejecting the mixed extracted steam of the sixth stage 7 of the steam turbine set cannot meet the heating requirement, so that the second-stage steam ejector ejection steam extraction pipeline regulating valve 103 is closed, the second-stage steam ejector for ejecting the extracted steam bypass regulating valve 102 is opened, the outlet steam of the second-stage steam ejector 202 can meet the heating requirement, and only the valve opening degree of the heating steam regulating valve 111 needs to be regulated;
operation mode under the low load of power plant: when the power plant operates under low load, namely below 50% load of a 350MW unit, the performance of the primary steam ejector 201 and the performance of the secondary steam ejector 202 under the working condition cannot be guaranteed, and the primary steam ejector 201 and the secondary steam ejector 202 are both in a closed state; at the moment, the power steam pipeline regulating valve 108 of the primary steam ejector is closed, the injection steam extraction pipeline regulating valve 101 of the primary steam ejector is closed, and the injection steam extraction bypass regulating valve 104 of the primary steam ejector is closed; at the moment, the power steam pipeline regulating valve 109 of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve 102 of the secondary steam ejector is closed, and the injection steam extraction pipeline regulating valve 103 of the secondary steam ejector is closed; for the industrial steam supply system, at this time, the industrial steam main pipe regulating valve 110 is closed, the industrial steam extraction pipeline regulating valve 106 is opened, and main steam generated by the steam generator 1 enters the industrial steam main pipe 203 after passing through the industrial steam pressure reducing valve 107, so that the stable operation of the industrial steam supply system is ensured; in the heating system, the heating steam bypass adjustment valve 105 is opened at this time, and the heating steam adjustment valve 111 is opened, so that the demand for steam in the heating system can be satisfied.
Compared with a conventional thermal power generating unit coupling steam supply and heat supply system, the cogeneration system with the two-stage steam ejector only needs to be additionally provided with the first-stage steam ejector, the second-stage steam ejector, the industrial steam main pipe, the heating heat exchanger and other steam pipeline regulating valves (101-plus 111) on the basis of the original thermal power generating unit, and the equipment is low in price, stable in performance, simple in structure and convenient to install, so that the cogeneration system with the two-stage steam ejector is expected to obtain remarkable energy-saving and economic benefits, and can achieve the following beneficial effects:
(1) the power steam source of the primary steam ejector is main steam, so that the adjustable range of industrial steam is wider.
(2) The injection steam source of the primary steam ejector is adjustable, and low-grade steam sources are utilized by switching according to different loads of a power plant while steam supply is met.
(3) The injection steam source of the secondary steam ejector is adjustable, so that the low-grade steam source can be utilized while the heating is ensured.
(4) The stability of industrial steam and heating steam is guaranteed to one-level steam ejector and second grade steam ejector, and low-grade steam source is utilized to the at utmost simultaneously, more can adapt to the wide load change of power plant.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The specific implementation mode is as follows:
as shown in figure 1, the system for wide-load operation of a power plant with two-stage steam ejectors comprises a steam generator 1, a first stage 2 of a steam turbine set, a second stage 3 of the steam turbine set, a third stage 4 of the steam turbine set, a fourth stage 5 of the steam turbine set, a fifth stage 6 of the steam turbine set, a sixth stage 7 of the steam turbine set, a heat regenerator 8, a deaerator 9, a water feed pump 10, a condenser 11 of the power plant, a condensate pump 12, a first-stage steam ejector jet extraction pipeline regulating valve 101, a second-stage steam ejector jet extraction bypass regulating valve 102, a second-stage steam ejector jet extraction pipeline regulating valve 103, a first-stage steam ejector jet extraction bypass regulating valve 104, a heating steam bypass regulating valve 105, an industrial steam extraction pipeline regulating valve 106, an industrial steam pressure reducing valve 107, a first-stage steam ejector power steam pipeline regulating valve 108, a second-stage steam ejector power steam pipeline regulating valve 109, a second-stage steam ejector jet extraction bypass regulating valve 104, a heating steam ejector bypass regulating valve 105, a steam ejector power steam ejector bypass regulating valve 107, a steam ejector power steam ejector, An industrial steam main pipe regulating valve 110, a heating steam regulating valve 111, a primary steam ejector 201, a secondary steam ejector 202, an industrial steam main pipe 203 and a heating heat exchanger 204;
the main steam outlet of the steam generator 1 is connected with the inlets of the first stage 2 and the second stage 3 of the steam turbine set in series, the exhaust outlet of the second stage 3 of the steam turbine set is connected with the reheat steam inlet of the steam generator 1, the reheat steam outlet of the steam generator 1 is connected with the inlets of the third stage 4 of the steam turbine set, the fourth stage 5 of the steam turbine set, the fifth stage 6 of the steam turbine set, the sixth stage 7 of the steam turbine set and other steam turbine stages in series, the outlet of the last stage of the steam turbine set is connected with the condenser 11 of the electric power plant, the condensate pump 12, four heat regenerators, the deaerator 9, the feed pump 10 and three heat regenerators in series, and the feed water outlet of the last heat regenerator 8 of the three heat regenerators is connected with the feed water inlet of the steam generator 1; the main steam outlet of the steam generator 1 is communicated with the power steam pipeline regulating valve 108 of the primary steam ejector and the power steam inlet pipeline of the primary steam ejector 201; the main steam outlet of the steam generator 1 communicates with the industrial steam extraction line regulating valve 106 and the industrial steam pressure reducing valve 107 and with the industrial steam header 203. The injection steam inlet of the first-stage steam ejector 201 is directly communicated with the steam extraction port of the second stage 3 of the steam turbine set through the injection steam extraction pipeline regulating valve 101 of the first-stage steam ejector, and the injection steam inlet of the first-stage steam ejector 201 is also directly communicated with the steam extraction port of the first stage 2 of the steam turbine set through the injection steam extraction bypass regulating valve 104 of the first-stage steam ejector; the outlet of the first-level steam ejector 201 is directly communicated with the industrial steam main pipe regulating valve 110 and the industrial steam main pipe 203; the outlet of the primary steam ejector 201 is also communicated with the power steam inlet pipeline of the secondary steam ejector power steam regulating valve 109 and the secondary steam ejector 202; an injection steam inlet of the secondary steam ejector 202 is communicated with the extraction opening of the sixth stage 7 of the steam turbine set through an injection steam extraction pipeline regulating valve 103 of the secondary steam ejector, and simultaneously, an injection steam inlet of the secondary steam ejector 202 is communicated with the extraction opening of the fifth stage 6 of the steam turbine set through an injection steam extraction bypass regulating valve 102 of the secondary steam ejector; the outlet steam of the secondary steam ejector 202 is communicated with the heating heat exchanger 204 through the heating steam regulating valve 111; further, the steam extraction port of the fourth stage 5 of the steam turbine group is connected to the heating heat exchanger 204 through the heating steam bypass adjustment valve 105 and the heating steam adjustment valve 111.
The cogeneration system with two stages of steam ejectors of the present invention can be operated in the following modes:
operating mode under high load of power plant: when the power plant operates under high load, namely above 75% load of a 350MW unit, the primary steam ejector 201 and the secondary steam ejector 202 are both in working states; the primary steam ejector 201 extracts main steam generated by the steam generator 1 and injects the extracted steam of the second stage 3 of the steam turbine set; at the moment, the power steam pipeline regulating valve 108 of the primary steam ejector is opened, the injection steam extraction pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam extraction bypass regulating valve 104 of the primary steam ejector is closed, and a bypass pipeline is cut off; at the moment, the industrial steam extraction pipeline regulating valve 106 is closed, the pipeline connection with the steam generator 1 is cut off, the industrial steam main pipe regulating valve 110 is opened, the valve opening degree is regulated according to the steam consumption requirement, and the flow control of industrial steam supply is realized; the power steam pipeline regulating valve 109 of the secondary steam ejector is opened, the secondary steam ejector injects the steam extraction bypass regulating valve 102 to be closed, the connection with the steam extraction bypass of the fifth stage 6 of the steam turbine is cut off, the secondary steam ejector injects the steam extraction pipeline regulating valve 103 to be opened, the outlet steam of the primary steam ejector 201 is used as the power steam of the secondary steam ejector 202, the steam extraction pipeline injects the steam extraction of the sixth stage 7 of the steam turbine unit through the secondary steam ejector, the outlet steam is used as heating steam to enter the heating heat exchanger 204, the heating steam regulating valve 111 is opened at the moment, the heating steam bypass regulating valve 105 is closed, and the control of heating heat load is realized through the regulation of the heating steam regulating valve 111;
operating mode under load in the power plant: when the power plant operates under a medium load, namely 50-75% THA load of 350MW steam turbine units, steam parameters of steam extraction ports of the steam turbine units of the power plant are reduced under the condition, at the moment, outlet steam parameters of the steam extraction ports of the second stage 3 of the steam turbine units, which are injected by the first-stage steam injector 201 and mixed with the extracted steam, cannot meet the requirement of industrial steam, so that the regulating valve 101 of the injection steam extraction pipeline of the first-stage steam injector is closed, the regulating valve 104 of the injection steam extraction bypass of the first-stage steam injector is opened, the amount of the extracted steam is controlled by controlling the opening degree of the valve, and the requirement of the industrial steam is met; meanwhile, the outlet steam parameters of the second-stage steam ejector 202 for ejecting the mixed extracted steam of the sixth stage 7 of the steam turbine set cannot meet the heating requirement, so that the second-stage steam ejector ejection steam extraction pipeline regulating valve 103 is closed, the second-stage steam ejector for ejecting the extracted steam bypass regulating valve 102 is opened, the outlet steam of the second-stage steam ejector 202 can meet the heating requirement, and only the valve opening degree of the heating steam regulating valve 111 needs to be regulated;
operation mode under the low load of power plant: when the power plant operates under low load, namely below 50% load of a 350MW unit, the performance of the primary steam ejector 201 and the performance of the secondary steam ejector 202 under the working condition cannot be guaranteed, and the primary steam ejector 201 and the secondary steam ejector 202 are both in a closed state; at the moment, the power steam pipeline regulating valve 108 of the primary steam ejector is closed, the injection steam extraction pipeline regulating valve 101 of the primary steam ejector is closed, and the injection steam extraction bypass regulating valve 104 of the primary steam ejector is closed; at the moment, the power steam pipeline regulating valve 109 of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve 102 of the secondary steam ejector is closed, and the injection steam extraction pipeline regulating valve 103 of the secondary steam ejector is closed; for the industrial steam supply system, at this time, the industrial steam main pipe regulating valve 110 is closed, the industrial steam extraction pipeline regulating valve 106 is opened, and main steam generated by the steam generator 1 enters the industrial steam main pipe 203 after passing through the industrial steam pressure reducing valve 107, so that the stable operation of the industrial steam supply system is ensured; in the heating system, the heating steam bypass adjustment valve 105 is opened at this time, and the heating steam adjustment valve 111 is opened, so that the demand for steam in the heating system can be satisfied.
Claims (7)
1. The utility model provides a system of power plant wide load operation with two-stage steam ejector which characterized in that: the steam turbine comprises a steam generator (1), a first stage (2) of a steam turbine unit, a second stage (3) of the steam turbine unit, a third stage (4) of the steam turbine unit, a fourth stage (5) of the steam turbine unit, a fifth stage (6) of the steam turbine unit, a sixth stage (7) of the steam turbine unit, a heat regenerator (8), a deaerator (9), a water feed pump (10), a condenser (11) of a power plant, a condensate pump (12), a first-stage steam ejector injection steam extraction pipeline regulating valve (101), a second-stage steam ejector injection steam extraction bypass regulating valve (102), a second-stage steam ejector injection steam extraction pipeline regulating valve (103), a first-stage steam ejector injection steam extraction bypass regulating valve (104), a heating steam extraction bypass regulating valve (105), an industrial steam extraction pipeline regulating valve (106), an industrial steam reducing valve (107), a first-stage steam ejector power steam pipeline regulating valve (108), a second-stage steam ejector power steam pipeline regulating valve (109), The system comprises an industrial steam main pipe regulating valve (110), a heating steam regulating valve (111), a primary steam ejector (201), a secondary steam ejector (202), an industrial steam main pipe (203) and a heating heat exchanger (204);
the main steam outlet of the steam generator (1) is connected with the inlets of a first stage (2) of the steam turbine set and a second stage (3) of the steam turbine set in series, the exhaust outlet of the second stage (3) of the steam turbine set is connected with the reheated steam inlet of the steam generator (1), the reheated steam outlet of the steam generator (1) is connected with the inlets of a third stage (4) of the steam turbine set, a fourth stage (5) of the steam turbine set, a fifth stage (6) of the steam turbine set, a sixth stage (7) of the steam turbine set and other steam turbine stages in series, the outlet of the last stage of the steam turbine set is connected with a condenser (11) of a power plant, a condensate pump (12), four regenerators, a deaerator (9), a water feed pump (10) and three regenerators in series, and the water feed outlet of the last regenerator (8) of the three regenerators is connected with the water feed inlet of the steam generator (1); the main steam outlet of the steam generator (1) is also communicated with a power steam pipeline regulating valve (108) of the primary steam ejector and a power steam inlet pipeline of the primary steam ejector (201) in sequence; the main steam outlet of the steam generator (1) is also communicated with an industrial steam extraction pipeline regulating valve (106), an industrial steam pressure reducing valve (107) and an industrial steam main pipe (203) in sequence; an injection steam inlet of the primary steam ejector (201) is directly communicated with a steam extraction port of the second stage (3) of the steam turbine set through an injection steam extraction pipeline regulating valve (101) of the primary steam ejector, and the injection steam inlet of the primary steam ejector (201) is also directly communicated with a steam extraction port of the first stage (2) of the steam turbine set through an injection steam extraction bypass regulating valve (104) of the primary steam ejector; the outlet of the primary steam ejector (201) is directly communicated with an industrial steam main pipe regulating valve (110) and an industrial steam main pipe (203); the outlet of the primary steam ejector (201) is also communicated with a power steam regulating valve (109) of a secondary steam ejector and a power steam inlet pipeline of a secondary steam ejector (202); an injection steam inlet of the secondary steam ejector (202) is communicated with an air extraction opening of the sixth stage (7) of the steam turbine set through an injection steam extraction pipeline regulating valve (103) of the secondary steam ejector, and simultaneously, an injection steam inlet of the secondary steam ejector (202) is communicated with an air extraction opening of the fifth stage (6) of the steam turbine set through an injection steam extraction bypass regulating valve (102) of the secondary steam ejector; the outlet steam of the secondary steam ejector (202) is communicated with a heating heat exchanger (204) through a heating steam regulating valve (111); in addition, the steam extraction port of the fourth stage (5) of the steam turbine set is communicated with a heating heat exchanger (204) through a heating steam bypass adjusting valve (105) and a heating steam adjusting valve (111).
2. A system for wide load operation of a power plant with two stage steam ejector as claimed in claim 1, wherein: the power steam of the primary steam ejector (201) comes from the main steam, so the adjustable range of the outlet steam pressure of the primary steam ejector (201) is 4-24MPa, and the adjustable range of the industrial steam is larger.
3. A system for wide load operation of a power plant with two stage steam ejector as claimed in claim 1, wherein: the injection steam source of the first-level steam ejector (201) is adjustable, the injection steam is injected through the first-level steam ejector to inject the steam extraction pipeline regulating valve (101) and the first-level steam ejector to inject the steam extraction bypass regulating valve (104) to switch, the steam supply is met, meanwhile, the low-grade steam source is utilized by switching according to different loads of a power plant, and the purpose of energy conservation is achieved by utilizing the steam with different grades.
4. A system for wide load operation of a power plant with two stage steam ejector as claimed in claim 1, wherein: the injection steam source of the secondary steam ejector (202) is adjustable, the injection steam is injected through the secondary steam ejector to inject the steam extraction pipeline regulating valve (103) and the secondary steam ejector to inject the steam extraction bypass regulating valve (102) to switch, the steam supply is met, meanwhile, the low-grade steam source is utilized by switching according to different loads of a power plant, and the purpose of energy conservation is achieved by utilizing the steam with different grades.
5. A system for wide load operation of a power plant with two stage steam ejector as claimed in claim 1, wherein: the industrial steam main pipe (203) is directly obtained from a main steam pipeline of a main steam outlet of the steam generator (1) through an industrial steam extraction pipeline regulating valve (106) and an industrial steam pressure reducing valve (107), so that the pressure adjustable range of the industrial steam is wider.
6. A system for wide load operation of a power plant with two stage steam ejector as claimed in claim 1, wherein: the steam source for heating of the heating heat exchanger (204) is switched between the steam exhaust of the fourth stage (5) of the steam turbine set and the outlet of the second-stage steam ejector (202), the low-grade steam source is utilized by switching according to different loads of a power plant, and the purpose of energy conservation is achieved by utilizing the steam of different grades.
7. A method of operating a power plant wide load operation system with a two stage steam ejector as claimed in any one of claims 1 to 6, wherein: the method comprises a power plant high-load operation mode, a power plant medium-load operation mode and a power plant low-load operation mode, and specifically comprises the following steps:
operating mode under high load of power plant: when the power plant operates under high load, namely above 75% load of a 350MW unit, the primary steam ejector (201) and the secondary steam ejector (202) are both in a working state; the primary steam ejector (201) extracts main steam generated by the steam generator (1) and ejects the extracted steam of the second stage (3) of the steam turbine set; at the moment, a power steam pipeline regulating valve (108) of the primary steam ejector is opened, an injection steam extraction pipeline regulating valve (101) of the primary steam ejector is opened, an injection steam extraction bypass regulating valve (104) of the primary steam ejector is closed, and a bypass pipeline is cut off; at the moment, the industrial steam extraction pipeline regulating valve (106) is closed, the pipeline connection with the steam generator (1) is cut off, the industrial steam main pipe regulating valve (110) is opened, the opening of the valve is regulated according to the steam consumption requirement, and the flow control of industrial steam supply is realized; the method comprises the following steps that a power steam pipeline regulating valve (109) of a secondary steam ejector is opened, a secondary steam ejector injects an extraction steam bypass regulating valve (102) to be closed, the connection with an extraction steam bypass of a fifth stage (6) of a steam turbine is cut off, the secondary steam ejector injects an extraction steam pipeline regulating valve (103) to be opened, outlet steam of a primary steam ejector (201) serves as power steam of a secondary steam ejector (202), extraction steam of a sixth stage (7) of the steam turbine unit is injected through the secondary steam ejector, the outlet steam serves as heating steam to enter a heating heat exchanger (204), a heating steam regulating valve (111) is opened at the moment, a heating steam bypass regulating valve (105) is closed, and heating heat load is controlled through regulation of the heating steam regulating valve (111);
operating mode under load in the power plant: when the power plant operates under a medium load, namely 50-75% THA load of 350MW units, steam parameters of steam extraction ports of the steam turbine units of the power plant are reduced under the condition, at the moment, outlet steam parameters of a first-stage steam ejector (201) for ejecting steam of a second stage (3) of the steam turbine units are mixed cannot meet industrial steam requirements, so that an ejection steam extraction pipeline adjusting valve (101) of the first-stage steam ejector is closed, an ejection steam extraction bypass adjusting valve (104) of the first-stage steam ejector is opened, the amount of extracted steam is controlled by controlling the opening degree of a valve, and the industrial steam requirements are met; meanwhile, outlet steam parameters of the second-stage steam ejector (202) after ejection mixing of the sixth stage (7) of the steam turbine set cannot meet heating requirements, so that the second-stage steam ejector ejection steam extraction pipeline regulating valve (103) is closed, the second-stage steam ejector ejection steam extraction bypass regulating valve (102) is opened, the outlet steam of the second-stage steam ejector (202) can meet the heating steam requirements, and only the valve opening degree of the heating steam regulating valve (111) needs to be adjusted;
operation mode under the low load of power plant: when the power plant operates under low load, namely below 50% load of a 350MW unit, the performance of the primary steam ejector (201) and the performance of the secondary steam ejector (202) under the working condition cannot be guaranteed, and the primary steam ejector (201) and the secondary steam ejector (202) are both in a closed state; at the moment, the power steam pipeline regulating valve (108) of the primary steam ejector is closed, the injection steam extraction pipeline regulating valve (101) of the primary steam ejector is closed, and the injection steam extraction bypass regulating valve (104) of the primary steam ejector is closed; at the moment, the power steam pipeline regulating valve (109) of the secondary steam ejector is closed, the injection steam extraction bypass regulating valve (102) of the secondary steam ejector is closed, and the injection steam extraction pipeline regulating valve (103) of the secondary steam ejector is closed; for an industrial steam supply system, the industrial steam main pipe regulating valve (110) is closed, the industrial steam extraction pipeline regulating valve (106) is opened, main steam generated by the steam generator (1) enters the industrial steam main pipe (203) after passing through the industrial steam pressure reducing valve (107), and the stable operation of the industrial steam supply system is ensured; in the heating system, the heating steam bypass adjusting valve (105) is opened at the moment, and the heating steam adjusting valve (111) is opened, so that the steam demand of the heating system can be met.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837757A (en) * | 2022-05-27 | 2022-08-02 | 华能国际电力股份有限公司 | Thermal power plant high-pressure feed water bypass frequency modulation system with steam ejector and working method |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650022A (en) * | 2009-08-21 | 2010-02-17 | 上海电力学院 | Steam turbine interstage back-heating heater cross-class connecting system |
| DE102010062623A1 (en) * | 2010-12-08 | 2012-06-14 | Siemens Aktiengesellschaft | Method for retrofitting a fossil-fired power plant with Heizdampfentnahme |
| EP2957731A1 (en) * | 2014-06-18 | 2015-12-23 | Alstom Technology Ltd | Method for increasing the power of a combined-cycle power plant, and combined-cycle power plant for conducting said method |
| KR101612227B1 (en) * | 2015-06-01 | 2016-04-14 | 김봉호 | Generation system using waste pressurte and waste heat, generation method thereof |
| CN205477782U (en) * | 2016-03-16 | 2016-08-17 | 华北电力大学 | Utilize ejector to adjust power generation system of little steam turbine of air supply drive water -feeding pump |
| CN108361086A (en) * | 2018-02-08 | 2018-08-03 | 西安交通大学 | A kind of energy saving thermoelectricity decoupled system and operation method |
| CN207864015U (en) * | 2018-01-18 | 2018-09-14 | 西安西热节能技术有限公司 | A kind of wide load industry steam supply coupled system of realization Large Steam Turbine Sets |
| CN109812866A (en) * | 2018-11-04 | 2019-05-28 | 大唐(北京)能源管理有限公司 | A kind of two-stage series exhaust steam residual heat recycling heating system |
| CN110145376A (en) * | 2018-10-07 | 2019-08-20 | 联合瑞升（北京）科技有限公司 | A kind of boiler and steam turbine decoupled system based on increasing steam turbine |
| CN110344899A (en) * | 2019-07-17 | 2019-10-18 | 河北冀研能源科学技术研究院有限公司 | The system and method for high pressure industry steam supply ability is mentioned under a kind of power plant underload |
| CN110847976A (en) * | 2019-11-13 | 2020-02-28 | 西安交通大学 | Water-electricity cogeneration system for wide-load operation of power plant and operation method |
| CN210801355U (en) * | 2019-11-05 | 2020-06-19 | 清华大学 | Thermoelectric decoupling system based on multistage injection type gas distribution and heat pump exhaust steam recovery |
| CN111608741A (en) * | 2020-05-29 | 2020-09-01 | 中国科学院上海高等研究院 | ORC system for recycling waste heat of generator |
| CN112050274A (en) * | 2020-08-26 | 2020-12-08 | 普瑞森能源科技（北京）股份有限公司 | Cascade energy utilization heating system under low-load working condition and control method thereof |
-
2021
- 2021-07-05 CN CN202110758561.8A patent/CN113464225B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650022A (en) * | 2009-08-21 | 2010-02-17 | 上海电力学院 | Steam turbine interstage back-heating heater cross-class connecting system |
| DE102010062623A1 (en) * | 2010-12-08 | 2012-06-14 | Siemens Aktiengesellschaft | Method for retrofitting a fossil-fired power plant with Heizdampfentnahme |
| EP2957731A1 (en) * | 2014-06-18 | 2015-12-23 | Alstom Technology Ltd | Method for increasing the power of a combined-cycle power plant, and combined-cycle power plant for conducting said method |
| KR101612227B1 (en) * | 2015-06-01 | 2016-04-14 | 김봉호 | Generation system using waste pressurte and waste heat, generation method thereof |
| CN205477782U (en) * | 2016-03-16 | 2016-08-17 | 华北电力大学 | Utilize ejector to adjust power generation system of little steam turbine of air supply drive water -feeding pump |
| CN207864015U (en) * | 2018-01-18 | 2018-09-14 | 西安西热节能技术有限公司 | A kind of wide load industry steam supply coupled system of realization Large Steam Turbine Sets |
| CN108361086A (en) * | 2018-02-08 | 2018-08-03 | 西安交通大学 | A kind of energy saving thermoelectricity decoupled system and operation method |
| CN110145376A (en) * | 2018-10-07 | 2019-08-20 | 联合瑞升（北京）科技有限公司 | A kind of boiler and steam turbine decoupled system based on increasing steam turbine |
| CN109812866A (en) * | 2018-11-04 | 2019-05-28 | 大唐(北京)能源管理有限公司 | A kind of two-stage series exhaust steam residual heat recycling heating system |
| CN110344899A (en) * | 2019-07-17 | 2019-10-18 | 河北冀研能源科学技术研究院有限公司 | The system and method for high pressure industry steam supply ability is mentioned under a kind of power plant underload |
| CN210801355U (en) * | 2019-11-05 | 2020-06-19 | 清华大学 | Thermoelectric decoupling system based on multistage injection type gas distribution and heat pump exhaust steam recovery |
| CN110847976A (en) * | 2019-11-13 | 2020-02-28 | 西安交通大学 | Water-electricity cogeneration system for wide-load operation of power plant and operation method |
| CN111608741A (en) * | 2020-05-29 | 2020-09-01 | 中国科学院上海高等研究院 | ORC system for recycling waste heat of generator |
| CN112050274A (en) * | 2020-08-26 | 2020-12-08 | 普瑞森能源科技（北京）股份有限公司 | Cascade energy utilization heating system under low-load working condition and control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837757A (en) * | 2022-05-27 | 2022-08-02 | 华能国际电力股份有限公司 | Thermal power plant high-pressure feed water bypass frequency modulation system with steam ejector and working method |
| CN114837757B (en) * | 2022-05-27 | 2023-05-05 | 华能国际电力股份有限公司 | High-water-adding bypass frequency modulation system of thermal power plant provided with steam ejector and working method |
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