CN113336289A - Water-heat-electricity cogeneration system with wide-load operation of power plant and operation method - Google Patents
Water-heat-electricity cogeneration system with wide-load operation of power plant and operation method Download PDFInfo
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- CN113336289A CN113336289A CN202110730468.6A CN202110730468A CN113336289A CN 113336289 A CN113336289 A CN 113336289A CN 202110730468 A CN202110730468 A CN 202110730468A CN 113336289 A CN113336289 A CN 113336289A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- 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
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The invention discloses a hydro-thermal-power cogeneration system for wide-load operation of a power plant and an operation method thereof.
Description
Technical Field
The invention belongs to the technical field of hydrothermal and electric cogeneration and relates to a hydrothermal and electric cogeneration system and an operation method for wide-load operation of a power plant.
Background
With the development of society, fresh water resources become natural resources which are in short supply in our lives. 97% of the earth is seawater, and the production of fresh water by using seawater is widely concerned by human beings. The seawater desalination technology can effectively relieve the problem of shortage of human fresh water resources, and the low-temperature multi-effect distillation technology gradually becomes the mainstream technology of seawater desalination due to the advantages of low working temperature, long service life of equipment and the like. In coastal and coastal cities, a large amount of fresh water, heat load and industrial steam are consumed by the cities; the combined heat and steam supply system of the thermal power generating unit and the low-temperature multi-effect distillation seawater desalination technology become a new method for water-heat-power cogeneration, and the water-heat-power cogeneration method can extract steam when a thermal power plant generates excessive steam, and is used for producing fresh water in industrial steam, heat load of heating and a seawater desalination system. In a combined heat and steam supply system of a thermal power generating unit and a low-temperature multi-effect distillation seawater desalination coupling system, a steam ejector plays an extremely important role, and the steam ejector not only can solve the problem of mismatching of steam parameters between a power plant steam extraction system and a seawater desalination system, but also can solve the problem of different steam parameters between industrial steam and heating steam; compared with the traditional temperature and pressure reducing device, the steam ejector can inject partial low-parameter steam, so that the purpose of energy conservation is achieved.
The single-stage steam ejector is used for ejecting certain effect secondary steam of a low-temperature multi-effect distillation seawater desalination system by taking extracted steam of a power plant as power steam, and outlet steam is used as first effect heating steam of a seawater desalination system. Single stage steam injectors may also be used for heating or as industrial steam; although the single-stage steam ejector can realize steam parameter matching between the thermal power generating unit and the sea-fresh system, the single-stage steam ejector cannot well realize cascade utilization of energy. In an industrial steam system, a temperature-reducing and pressure-reducing valve is adopted more, so that the waste of steam grade is great; in addition, the flexibility of the water-heat-power cogeneration is not high enough, and when the thermal power generating unit operates at low load, the performance of the steam ejector is deteriorated under variable working conditions, so that the injection coefficient is reduced, the injection capacity is reduced, and the operation of the hydrothermal electric coupling system is directly influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a hydrothermal cogeneration system and a hydrothermal cogeneration method for wide-load operation of a power plant, wherein the hydrothermal cogeneration system and the hydrothermal cogeneration method can realize cascade utilization of steam.
In order to achieve the purpose, the hydro-thermal-power cogeneration system for wide-load operation of the power plant comprises a steam turbine high-pressure cylinder, a primary steam ejector, a third stage of a steam turbine unit, a fourth stage of the steam turbine unit, a sixth stage of the steam turbine unit, a power steam bypass regulating valve of the secondary steam ejector, a power steam bypass valve of the tertiary steam ejector, an industrial steam main pipe, a heating steam regulating valve, a heating heat exchanger, a power steam pipeline regulating valve of the tertiary steam ejector, a seawater condenser, a water spray desuperheater and a transverse pipe falling film evaporator group;
the outlet of the steam exhaust pipeline of the fourth stage of the steam turbine set is communicated with an injection steam inlet of the first-stage steam ejector and one end of a power steam bypass regulating valve of the second-stage steam ejector;
the outlet of the first-stage steam ejector is divided into two paths, wherein one path is communicated with the power steam pipeline of the second-stage steam ejector, and the other path is communicated with one end of a power steam bypass valve of the third-stage steam ejector and an industrial steam main pipe;
the outlet of the third stage steam exhaust pipeline of the steam turbine set is communicated with an industrial steam main pipe, the outlet of the sixth stage steam exhaust pipeline of the steam turbine set is communicated with an ejection steam inlet of a second-stage steam ejector, the outlet of the second-stage steam ejector is divided into two paths, one path of the two paths of, the outlet of the water spray desuperheater is communicated with the inlet of the horizontal tube falling film evaporator group.
The outlet of the steam generator is communicated with the sixth stage of the steam turbine set through the high-pressure cylinder of the steam turbine, the third stage of the steam turbine set and the fourth stage of the steam turbine set.
The outlet of the first-stage steam ejector is divided into two paths, wherein one path is communicated with the power steam pipeline of the second-stage steam ejector through a power steam pipeline adjusting valve of the second-stage steam ejector, and the other path is communicated with one end of a power steam bypass valve of the third-stage steam ejector and an industrial steam main pipe through an industrial steam main pipe adjusting valve.
The outlet of the steam exhaust pipeline of the high-pressure cylinder of the steam turbine is communicated with the power steam pipeline of the primary steam ejector through the power steam pipeline adjusting valve of the primary steam ejector.
The outlet of the steam exhaust pipeline of the third stage of the steam turbine set is communicated with an industrial steam main pipe through an industrial steam extraction pipeline regulating valve.
The outlet of the steam exhaust pipeline of the sixth stage of the steam turbine set is communicated with the injection steam inlet of the secondary steam ejector through the injection steam extraction pipeline regulating valve of the secondary steam ejector.
The outlet of the water spray desuperheater is communicated with the inlet of the horizontal tube falling film evaporator group, the steam outlet of the horizontal tube falling film evaporator group is communicated with the steam inlet of the seawater condenser, the seawater outlet of the horizontal tube falling film evaporator group is communicated with the seawater flash tank group, the fresh water outlet of the horizontal tube falling film evaporator group is communicated with the inlet of the fresh water tank, the fresh water outlet of the seawater condenser is communicated with the inlet of the fresh water tank, the inlet of the seawater material pump is communicated with the seawater outlet of the seawater condenser, and the outlet of the seawater material pump is communicated with the seawater inlet of the horizontal tube falling film evaporator group.
The outlet of the water spray desuperheater is communicated with the steam pipeline inlet of the first-effect evaporator in the horizontal pipe falling film evaporator group; the seawater outlet of the first-effect evaporator is communicated with the inlet of a first-effect flash tank in the seawater flash tank group, the secondary steam outlet of the previous-effect flash tank is communicated with the steam inlet of the next-effect evaporator, and the seawater outlet of the previous-effect flash tank is communicated with the inlet of the next-effect flash tank; the secondary steam outlet of the former evaporator is communicated with the steam inlet of the latter evaporator, the secondary steam outlet of the former flash tank is communicated with the steam inlet of the latter evaporator, the secondary steam outlet of the last evaporator is communicated with the steam inlet of the seawater condenser, the secondary steam outlet of the last flash tank is communicated with the steam inlet of the seawater condenser, the fresh water outlet of each evaporator is communicated with the fresh water tank, the fresh water outlet of the seawater condenser is communicated with the inlet of the fresh water tank, the inlet of the seawater material pump is communicated with the seawater outlet of the seawater condenser, and the outlet of the seawater material pump is communicated with the seawater inlet of each evaporator in the falling film evaporator group.
An operation method of a hydrothermal power cogeneration system with wide-load operation of a power plant comprises the following steps:
when the steam exhaust of the intermediate pressure cylinder of the steam turbine set runs above 630kPa, the primary steam ejector, the secondary steam ejector and the tertiary steam ejector are all in working states, wherein the primary steam ejector extracts the steam exhaust of the high pressure cylinder of the steam turbine and injects the steam exhaust of the intermediate pressure cylinder of the fourth stage of the steam turbine set; at the moment, the regulating valve of the industrial steam extraction pipeline is closed, the power steam bypass valve of the three-stage steam ejector is closed, the regulating valve of the industrial steam main pipe is opened, the opening degree of the regulating valve of the industrial steam main pipe is adjusted according to the requirement of the steam consumption, and the flow control of the industrial steam supply is realized; the method comprises the steps that a secondary steam ejector power steam bypass regulating valve is closed, a secondary steam ejector power steam pipeline regulating valve is opened, a secondary steam ejector ejects an extraction steam pipeline regulating valve to be opened, steam output by a primary steam ejector serves as power steam of the secondary steam ejector, extraction steam of the sixth stage of a steam turbine unit is ejected through the secondary steam ejector, the steam output by the secondary steam ejector is divided into two paths, one path serves as power steam of a tertiary steam ejector, the other path serves as heating steam and enters a heating heat exchanger, the heating steam regulating valve is opened, the opening degree of the heating steam regulating valve is adjusted to realize control of heating heat load, the tertiary steam ejector power steam pipeline regulating valve is opened, and the water production amount of a seawater desalination system is controlled by adjusting the opening degree of the tertiary steam ejector power steam pipeline regulating valve; steam output by the secondary steam ejector is used as power steam of the tertiary steam ejector to eject steam at an inlet of the seawater condenser, and the steam output by the tertiary steam ejector enters a first-effect evaporator of the horizontal tube falling film evaporator group after passing through the water spray desuperheater to be used as heating steam to produce water;
operating mode under low load of power plant
When the steam exhaust of a medium pressure cylinder of the steam turbine set runs below 630kPa, an industrial steam main pipe regulating valve and a primary steam ejector power steam pipeline regulating valve are opened, and the steam extraction amount is controlled by regulating the opening of the primary steam ejector power steam pipeline regulating valve, so that the requirement of industrial steam is met; and opening a power steam pipeline regulating valve of the secondary steam ejector and an injection steam extraction pipeline regulating valve of the secondary steam ejector, utilizing the steam output by the secondary steam ejector to meet the heating load requirement by regulating the opening of the heating steam regulating valve, and simultaneously opening a power steam bypass valve of the tertiary steam ejector and a power steam bypass regulating valve of the secondary steam ejector to meet the steam demand of the seawater desalination system.
The invention has the following beneficial effects:
according to the wide-load operation hydro-thermal-power cogeneration system and the operation method of the power plant, when the system is operated specifically, the first-stage steam ejector, the second-stage steam ejector and the third-stage steam ejector are arranged, so that when the load of the power plant changes in a large range, the working state of each stage of steam ejector is changed, and on the premise of ensuring the normal work of a heat supply steam supply system and a low-temperature multi-effect distillation seawater desalination coupling system, low-grade energy is utilized to a greater extent, the cascade utilization of the energy is realized, the steam cost for industrial steam supply is reduced, the steam cost of the seawater desalination system is reduced, the water production cost is reduced, and the obvious energy-saving and economic benefits are achieved. Meanwhile, other energy is not required to be consumed during the operation of the steam ejector, the operation is stable, and the safety and the reliability of the equipment are high.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a steam generator, 2 is a high-pressure cylinder of a steam turbine, 3 is a third stage of the steam turbine, 4 is a fourth stage of the steam turbine, 5 is a sixth stage of the steam turbine, 6 is a water spray desuperheater, 7 is a horizontal pipe falling film evaporator group, 8 is a seawater flash tank group, 9 is a seawater condenser, 10 is a seawater material pump, 11 is a fresh water tank, 101 is an industrial steam extraction pipeline regulating valve, 102 is a second-stage steam ejector power steam bypass regulating valve, 103 is an industrial steam main pipe regulating valve, 104 is a second-stage steam ejector power steam pipeline regulating valve, 105 is a second-stage steam ejector injection steam extraction pipeline regulating valve, 106 is a heating steam regulating valve, 107 is a third-stage steam ejector power steam pipeline regulating valve, 108 is a third-stage steam ejector power steam bypass valve, 109 is a first-stage steam ejector power steam pipeline regulating valve, 201 is a first-stage steam ejector, 202 is a two-stage steam ejector, 203 is a three-stage steam ejector, 204 is an industrial header pipe, and 205 is a heating heat exchanger.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the cogeneration system with three-stage steam ejector according to the present invention includes a steam generator 1, a high-pressure steam turbine cylinder 2, a third stage 3 of a steam turbine unit, a fourth stage 4 of the steam turbine unit, a sixth stage 5 of the steam turbine unit, an industrial steam extraction line regulating valve 101, a second-stage steam ejector power steam bypass regulating valve 102, an industrial steam main line regulating valve 103, a second-stage steam ejector power steam line regulating valve 104, a second-stage steam ejector steam extraction line regulating valve 105, a heating steam regulating valve 106, a third-stage steam ejector power steam line regulating valve 107, a third-stage steam ejector power steam bypass valve 108, a first-stage steam ejector 201, a second-stage steam ejector 202, a third-stage steam ejector 203, an industrial steam main line 204, a heating heat exchanger 205, a water spray desuperheater 6, a horizontal tube falling film evaporator group 7, a seawater flash tank group 8, and a steam ejector, A seawater condenser 9, a seawater material pump 10 and a fresh water tank 11;
the outlet of the steam generator 1 is communicated with the sixth stage 5 of the steam turbine set through the high pressure cylinder 2 of the steam turbine, the third stage 3 of the steam turbine set and the fourth stage 4 of the steam turbine set;
an outlet of a steam exhaust pipeline of the high-pressure steam turbine cylinder 2 is communicated with a power steam pipeline of a first-stage steam ejector 201 through a first-stage steam ejector power steam pipeline regulating valve 109, and an outlet of a steam exhaust pipeline of a fourth stage 4 of the steam turbine set is communicated with an injection steam inlet of the first-stage steam ejector 201 and one end of a second-stage steam ejector power steam bypass regulating valve 102;
the outlet of the first-stage steam ejector 201 is divided into two paths, wherein one path is communicated with the power steam pipeline of the second-stage steam ejector 202 through a second-stage steam ejector power steam pipeline regulating valve 104, and the other path is communicated with one end of a third-stage steam ejector power steam bypass valve 108 and an industrial steam main pipe 204 through an industrial steam main pipe regulating valve 103;
the outlet of the steam exhaust pipeline of the third stage 3 of the steam turbine set is communicated with an industrial steam main pipe 204 through an industrial steam extraction pipeline regulating valve 101, the outlet of the steam exhaust pipeline of the sixth stage 5 of the steam turbine set is communicated with the injection steam inlet of a second-stage steam ejector 202 through a second-stage steam ejector injection steam extraction pipeline regulating valve 105, the outlet of the second-stage steam ejector 202 is divided into two paths, one path is communicated with the heat release side of a heating heat exchanger 205 through a heating steam regulating valve 106, the other end of the other path of the second-stage steam ejector power steam bypass regulating valve 102 is communicated with one end of a third-stage steam ejector power steam pipeline regulating valve 107 through a pipeline and a pipe, the other end of the third-stage steam ejector power steam pipeline regulating valve 107 and the other end of the third-stage steam ejector power steam valve 108 are communicated with the power steam pipeline of a third-stage steam ejector 203, and the injection steam inlet of the third-stage steam ejector 203 is communicated with the inlet of a seawater condenser 9, the outlet of the tertiary steam ejector 203 is communicated with the inlet of the water spray desuperheater 6.
An outlet of the water spray desuperheater 6 is communicated with a steam pipeline inlet of a first-effect evaporator in the horizontal pipe falling film evaporator group 7; the seawater outlet of the first-effect evaporator is communicated with the inlet of a first-effect flash tank in the seawater flash tank group 8, the secondary steam outlet of the previous-effect flash tank is communicated with the steam inlet of the next-effect evaporator, and the seawater outlet of the previous-effect flash tank is communicated with the inlet of the next-effect flash tank; the secondary steam outlet of the former evaporator is communicated with the steam inlet of the latter evaporator, the secondary steam outlet of the flash tank of the former evaporator is communicated with the steam inlet of the latter evaporator, the secondary steam outlet of the last evaporator is communicated with the steam inlet of the seawater condenser 9, the secondary steam outlet of the last flash tank is communicated with the steam inlet of the seawater condenser 9, the fresh water outlet of each evaporator is communicated with the fresh water tank 11, the fresh water outlet of the seawater condenser 9 is communicated with the inlet of the fresh water tank 11, the inlet of the seawater material pump 10 is communicated with the seawater outlet of the seawater condenser 9, and the outlet of the seawater material pump 10 is communicated with the seawater inlet of each evaporator in the transverse pipe falling film evaporator group 7.
The operation method of the hydrothermal power cogeneration system with wide-load operation of the power plant comprises the following steps of:
operating mode of power plant under high load
When the steam discharged by the middle pressure cylinder of the steam turbine set runs above 630kPa (60% THA load), the primary steam ejector 201, the secondary steam ejector 202 and the tertiary steam ejector 203 are all in working states; the first-stage steam ejector 201 extracts the exhaust steam of the high-pressure cylinder 2 of the steam turbine and ejects the exhaust steam of the intermediate-pressure cylinder of the fourth stage 4 of the steam turbine unit; at the moment, the industrial steam extraction pipeline regulating valve 101 is closed, the three-stage steam ejector power steam bypass valve 108 is closed, the industrial steam main pipe regulating valve 103 is opened, the opening degree of the industrial steam main pipe regulating valve 103 is adjusted according to the requirement of steam consumption, and the flow control of industrial steam supply is realized; the power steam bypass regulating valve 102 of the secondary steam ejector is closed, the power steam pipeline regulating valve 104 of the secondary steam ejector is opened, the injection steam extraction pipeline regulating valve 105 of the secondary steam ejector is opened, the steam output by the primary steam ejector 201 is used as the power steam of the secondary steam ejector 202, the steam output by the secondary steam ejector 202 is divided into two paths by the steam extraction of the sixth stage 5 of the injection steam turbine set of the secondary steam ejector 202, one path of the steam is taken as power steam of the three-stage steam ejector 203, the other path of the steam is taken as heating steam to enter a heating heat exchanger 205, the heating steam control valve 106 is opened to adjust the opening degree of the heating steam control valve 106, to control the heating heat load, the three stage steam ejector power steam line regulator valve 107 is opened, the opening degree of the three-stage steam ejector power steam pipeline regulating valve 107 is regulated to control the water production amount of the seawater desalination system. Steam output by the secondary steam ejector 202 is used as power steam of the tertiary steam ejector 203 to eject steam at an inlet of the seawater condenser 9, and the steam output by the tertiary steam ejector 203 passes through the water spray desuperheater 6 and then enters the first-effect evaporator of the horizontal pipe falling film evaporator group 7 to be used as heating steam to produce water;
operating mode under low load of power plant
When the steam exhaust of the intermediate pressure cylinder of the steam turbine set runs below 630kPa (60% THA load), because the steam parameters at the positions of the steam extraction ports of the power plant are low, the industrial steam main pipe regulating valve 103 is opened at the moment, the first-stage steam ejector 201 cannot meet the requirements of industrial steam, the first-stage steam ejector power steam pipeline regulating valve 109 needs to be opened, and the steam extraction amount is controlled by regulating the opening degree of the first-stage steam ejector power steam pipeline regulating valve 109, so that the requirements of the industrial steam are met; the power steam pipeline regulating valve 104 of the secondary steam ejector is opened, the injection steam extraction pipeline regulating valve 105 of the secondary steam ejector is opened, and for heating heat load, the steam output by the secondary steam ejector 202 can still meet the heating heat load requirement due to the fact that the required steam temperature is relatively low (about 120 ℃), so that the opening degree of the heating steam regulating valve 106 is only required to be regulated; for the power steam of the seawater desalination system, the steam bypass valve 108 of the three-stage steam ejector is opened, and the steam bypass regulating valve 102 of the two-stage steam ejector is opened, so that the steam demand of the seawater desalination system can be met.
Claims (9)
1. A hydro-thermal power cogeneration system for wide-load operation of a power plant is characterized by comprising a turbine high-pressure cylinder (2), a primary steam ejector 201, a third stage (3) of a turbine unit, a fourth stage (4) of the turbine unit, a sixth stage (5) of the turbine unit, a secondary steam ejector power steam bypass regulating valve (102), a secondary steam ejector (202), a tertiary steam ejector power steam bypass valve (108), an industrial steam main pipe (204), a heating steam regulating valve (106), a heating heat exchanger (205), a tertiary steam ejector power steam pipeline regulating valve (107), a tertiary steam ejector (203), a seawater condenser (9), a water spray desuperheater (6) and a transverse pipe falling film evaporator group (7);
an outlet of an exhaust pipeline of the high-pressure cylinder (2) of the steam turbine is communicated with a power steam pipeline of the first-stage steam ejector (201), and an outlet of an exhaust pipeline of the fourth stage (4) of the steam turbine unit is communicated with an injection steam inlet of the first-stage steam ejector (201) and one end of a power steam bypass regulating valve (102) of the second-stage steam ejector;
the outlet of the first-stage steam ejector (201) is divided into two paths, wherein one path is communicated with the power steam pipeline of the second-stage steam ejector (202), and the other path is communicated with one end of the power steam bypass valve (108) of the third-stage steam ejector and the industrial steam main pipe (204);
an outlet of an exhaust pipeline of a third stage (3) of the steam turbine set is communicated with an industrial steam main pipe (204), an outlet of an exhaust pipeline of a sixth stage (5) of the steam turbine set is communicated with an injection steam inlet of a second-stage steam ejector (202), an outlet of the second-stage steam ejector (202) is divided into two paths, one path of the two paths is communicated with a heat release side of a heating heat exchanger (205) through a heating steam adjusting valve (106), the other end of a second-stage steam ejector power steam bypass adjusting valve (102) is communicated with one end of a third-stage steam ejector power steam pipeline adjusting valve (107) after being connected in parallel through a pipeline, the other end of the third-stage steam ejector power steam pipeline adjusting valve (107) and the other end of a third-stage steam ejector power steam bypass valve (108) are both communicated with a power steam pipeline of a third-stage steam ejector (203), and the injection steam inlet of the third-stage steam ejector (203) is communicated with an inlet of a seawater condenser (9), the outlet of the three-level steam ejector (203) is communicated with the inlet of the water spray desuperheater (6), and the outlet of the water spray desuperheater (6) is communicated with the inlet of the horizontal pipe falling film evaporator group (7).
2. The cogeneration system for wide load operation of power plants according to claim 1, characterized in that the outlet of the steam generator (1) is connected to the sixth stage (5) of the steam turbine through the high pressure cylinder (2) of the steam turbine, the third stage (3) of the steam turbine and the fourth stage (4) of the steam turbine.
3. The cogeneration system for water, heat and power with wide-load operation of power plant according to claim 1, characterized in that the outlet of the primary steam ejector (201) is divided into two paths, wherein one path is communicated with the power steam pipeline of the secondary steam ejector (202) through the power steam pipeline adjusting valve (104) of the secondary steam ejector, and the other path is communicated with one end of the power steam bypass valve (108) of the tertiary steam ejector and the industrial steam main pipe (204) through the industrial steam main pipe adjusting valve (103).
4. The power plant wide load operation hydrothermal power cogeneration system according to claim 1, characterized in that the steam exhaust line outlet of the steam turbine high pressure cylinder (2) is communicated with the power steam line of the primary steam ejector (201) through the primary steam ejector power steam line regulating valve (109).
5. The power plant wide load operation hydrothermal power cogeneration system according to claim 1, wherein an outlet of a steam exhaust pipeline of the third stage (3) of the steam turbine unit is communicated with an industrial steam main pipe (204) through an industrial steam extraction pipeline regulating valve (101).
6. The power plant wide-load operation hydrothermal cogeneration system according to claim 1, wherein an outlet of a steam exhaust pipeline of the sixth stage (5) of the steam turbine unit is communicated with an injection steam inlet of the secondary steam injector (202) through a secondary steam injector injection steam extraction pipeline regulating valve (105).
7. The power plant wide-load operation hydrothermal cogeneration system according to claim 1, further comprising a fresh water tank (11), a seawater flash tank set (8) and a seawater material pump (10); the steam outlet of the horizontal tube falling film evaporator group (7) is communicated with the steam inlet of a seawater condenser (9), the seawater outlet of the horizontal tube falling film evaporator group (7) is communicated with a seawater flash evaporation tank group (8), the fresh water outlet of the horizontal tube falling film evaporator group (7) is communicated with the inlet of a fresh water tank (11), the fresh water outlet of the seawater condenser (9) is communicated with the inlet of the fresh water tank (11), the inlet of a seawater material pump (10) is communicated with the seawater outlet of the seawater condenser (9), and the outlet of the seawater material pump (10) is communicated with the seawater inlet of the horizontal tube falling film evaporator group (7).
8. The hydrothermal cogeneration system with wide-load operation of power plants according to claim 8, characterized in that the outlet of the water spray desuperheater (6) is communicated with the inlet of the steam pipeline of the first-effect evaporator in the horizontal tube falling film evaporator group (7); the seawater outlet of the first-effect evaporator is communicated with the inlet of a first-effect flash tank in a seawater flash tank group (8), the secondary steam outlet of the previous-effect flash tank is communicated with the steam inlet of the next-effect evaporator, and the seawater outlet of the previous-effect flash tank is communicated with the inlet of the next-effect flash tank; the secondary steam outlet of the former evaporator is communicated with the steam inlet of the latter evaporator, the secondary steam outlet of the flash tank of the former evaporator is communicated with the steam inlet of the latter evaporator, the secondary steam outlet of the last evaporator is communicated with the steam inlet of the seawater condenser (9), the secondary steam outlet of the last flash tank is communicated with the steam inlet of the seawater condenser (9), the fresh water outlet of each evaporator is communicated with the fresh water tank (11), the fresh water outlet of the seawater condenser (9) is communicated with the inlet of the fresh water tank (11), the inlet of the seawater material pump (10) is communicated with the seawater outlet of the seawater condenser (9), and the outlet of the seawater material pump (10) is communicated with the seawater inlet of each evaporator in the horizontal tube evaporator group (7).
9. An operation method of a hydrothermal power cogeneration system with wide-load operation of a power plant is characterized by comprising the following steps of:
when the steam exhaust of the intermediate pressure cylinder of the steam turbine set runs above 630kPa, the primary steam ejector (201), the secondary steam ejector (202) and the tertiary steam ejector (203) are all in working states, wherein the primary steam ejector (201) extracts the steam exhaust of the high pressure cylinder (2) of the steam turbine and injects the steam exhaust of the intermediate pressure cylinder of the fourth stage 4 of the steam turbine set; at the moment, the regulating valve (101) of the industrial steam extraction pipeline is closed, the power steam bypass valve (108) of the three-stage steam ejector is closed, the regulating valve (103) of the industrial main steam pipe is opened, and the opening degree of the regulating valve (103) of the industrial main steam pipe is regulated according to the requirement of the steam consumption, so that the flow control of industrial steam supply is realized; the method comprises the steps that a secondary steam ejector power steam bypass adjusting valve (102) is closed, a secondary steam ejector power steam pipeline adjusting valve (104) is opened, a secondary steam ejector jet steam extraction pipeline adjusting valve (105) is opened, steam output by a primary steam ejector (201) serves as power steam of a secondary steam ejector (202), steam is extracted through a sixth stage (5) of a jet steam turbine set of the secondary steam ejector (202), the steam output by the secondary steam ejector (202) is divided into two paths, one path serves as the power steam of a tertiary steam ejector (203), the other path serves as heating steam and enters a heating heat exchanger (205), a heating steam adjusting valve (106) is opened, the opening degree of the heating steam adjusting valve (106) is adjusted, so that heating heat load control is achieved, a tertiary steam ejector power steam pipeline adjusting valve (107) is opened, and the opening degree of the tertiary steam ejector power steam pipeline adjusting valve (107) is adjusted, to control the water production amount of the seawater desalination system; steam output by the secondary steam ejector (202) is used as power steam of the tertiary steam ejector (203) to eject steam at an inlet of the seawater condenser (9), and the steam output by the tertiary steam ejector (203) passes through the water spray desuperheater (6) and then enters a first-effect evaporator of the transverse pipe falling film evaporator group (7) to be used as heating steam to produce water;
operating mode under low load of power plant
When the steam exhaust of a medium pressure cylinder of the steam turbine set runs below 630kPa, an industrial steam main pipe regulating valve (103) and a primary steam ejector power steam pipeline regulating valve (109) are opened, and the steam extraction amount is controlled by regulating the opening degree of the primary steam ejector power steam pipeline regulating valve (109), so that the requirement of industrial steam is met; the method comprises the steps of opening a secondary steam ejector power steam pipeline regulating valve (104) and a secondary steam ejector injection steam extraction pipeline regulating valve (105), utilizing steam output by a secondary steam ejector (202) to meet heating load requirements by regulating the opening degree of a heating steam regulating valve (106), and opening a three-level steam ejector power steam bypass valve (108) and a secondary steam ejector power steam bypass regulating valve (102) to meet steam requirements of a seawater desalination system.
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