CN110847976A - Water-electricity cogeneration system for wide-load operation of power plant and operation method - Google Patents
Water-electricity cogeneration system for wide-load operation of power plant and operation method Download PDFInfo
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- CN110847976A CN110847976A CN201911108945.4A CN201911108945A CN110847976A CN 110847976 A CN110847976 A CN 110847976A CN 201911108945 A CN201911108945 A CN 201911108945A CN 110847976 A CN110847976 A CN 110847976A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- C02F1/043—Details
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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
- C02F1/08—Thin film evaporation
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The invention discloses a water-electricity cogeneration system and an operation method for wide-load operation of a power plant, wherein the system is arranged between a conventional thermal power generating unit and a seawater desalination coupled system, and can flexibly switch the steam source position of a seawater desalination system when the load of the power plant changes in a large range to ensure the normal operation of the seawater desalination system by arranging a primary steam ejector, a secondary steam ejector, a primary steam ejector power steam bypass regulating valve, a primary steam ejector power steam pipeline regulating valve, a primary steam ejector injection steam bypass regulating valve and a secondary steam ejector injection steam pipeline regulating valve device; in addition, the two-stage steam ejector realizes the cascade utilization of energy to a greater extent, and simultaneously can reduce the steam cost of the seawater desalination system, thereby reducing the water production cost. The system provides significant savings in both energy savings and economic benefits.
Description
Technical Field
The invention relates to a water and power cogeneration system for wide-load operation of a power plant, in particular to a combined system of a thermal power generating unit with two stages of steam ejectors and a low-temperature multi-effect distillation seawater desalination system and an operation method.
Background
As China is a big population country, natural resources are abundant, but the occupied amount of people is low, and fresh water resources are in short supply. Therefore, it is very important to find fresh water resources, the seawater desalination technology is an important way to generate fresh water, 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. The heat-engine unit is combined with a low-temperature multi-effect distillation seawater desalination technology to form a new method for water and electricity cogeneration, and the water and electricity cogeneration method enables steam to be pumped into a seawater desalination system to produce fresh water when a heat-engine plant generates excessive steam. In thermal power generating unit and low temperature multiple effect distillation sea water desalination coupled system, the steam jet ware has very important effect, and the steam jet ware has solved the unmatched problem of steam parameter between power plant's extraction of steam and the sea water desalination system, compares traditional pressure reducer that reduces the temperature, and the steam jet ware can draw partial low parameter steam, and then reaches energy-conserving purpose.
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. 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. And the flexibility of water and electricity 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, the economical efficiency is reduced, and the steam cost of a sea-fresh system is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a water-electricity cogeneration system and a water-electricity cogeneration method for wide-load operation of a power plant.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a hydropower cogeneration system for wide-load operation of a power plant is composed of a steam turbine unit 1, a generator 2, a primary steam ejector 3, a secondary steam ejector 4, a water spray desuperheater 5, a horizontal pipe falling film evaporator group 6, a seawater flash tank group 7, a seawater condenser 8, a seawater material pump 9, a fresh water tank (10), a primary steam ejector power steam bypass regulating valve 100, a primary steam ejector power steam pipeline regulating valve 101, a primary steam ejector ejection steam pipeline regulating valve 102, a primary steam ejector ejection steam pipeline regulating valve 103 and a secondary steam ejector ejection steam pipeline regulating valve 104;
the high-temperature high-pressure steam works in the steam turbine unit 1, and the thermoelectric energy is converted through the generator 2; an outlet of a steam exhaust pipeline of a pressure cylinder in the steam turbine unit 1 is communicated with a power steam pipeline of a primary steam ejector 3 through a primary steam ejector power steam regulating valve 101, and is communicated with a power steam pipeline of a secondary steam ejector 4 through a primary steam ejector power steam bypass regulating valve 100; the low-pressure cylinder steam exhaust pipeline of the steam turbine set 1 is communicated with an injection steam pipeline of the primary steam injector 3 through an injection steam pipeline regulating valve 102 of the primary steam injector, and is communicated with an outlet steam pipeline of the secondary steam injector 4 through an injection steam bypass regulating valve 103 of the primary steam injector; a power steam inlet of the secondary steam ejector 4 is communicated with a steam pipeline at the outlet of the primary steam ejector 3, and an injection steam pipeline of the secondary steam ejector 4 is communicated with an inlet of the seawater condenser 8 through an injection steam pipeline regulating valve 104 of the secondary steam ejector; an outlet steam pipeline of the secondary steam ejector 4 is communicated with an inlet of a water spray desuperheater 5, and an outlet of the water spray desuperheater 5 is communicated with an inlet of a first-effect evaporator steam pipeline of a transverse pipe falling film evaporator group 6; the seawater outlet of the first-effect evaporator is communicated with the inlet of a first-effect flash tank of the seawater flash tank group 7, secondary steam at the outlet of the first-effect flash tank is communicated with the steam inlet of a next-effect evaporator 10, and seawater at the outlet of the first-effect flash tank is communicated with the inlet of a next-effect flash tank 11; 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 8, the secondary steam outlet of the last flash tank is communicated with the steam inlet of the seawater condenser 8, the fresh water generated by each evaporator is gathered and then flows into the fresh water tank 10, the fresh water outlet of the seawater condenser 8 is communicated with the inlet of the fresh water tank 10, the inlet of the seawater material pump 9 is communicated with the seawater outlet of the seawater condenser 8, and the outlet of the seawater material pump 9 is communicated with the seawater inlet of each evaporator of the horizontal tube evaporator group 6.
A hydropower cogeneration system of wide load operation of power plant, through setting up one-level steam ejector 3 and second grade steam ejector 4, when the load of power plant in a large scale changes, through changing the start-stop state of steam ejector, under the prerequisite of guaranteeing the normal work of seawater desalination system, the cascade utilization of the energy has been realized to a great extent.
The arrangement of the steam pipeline regulating valves 100 and 104 enables the position of a steam source to be flexibly switched, reduces the steam cost of the seawater desalination system, and further reduces the water production cost. The system provides significant savings in both energy savings and economic benefits.
The primary steam ejector power steam bypass regulating valve 100, the primary steam ejector power steam pipeline regulating valve 101 and the primary steam ejector injection steam pipeline regulating valve 102 are used for determining the working state of the primary steam ejector 3 by regulating the opening of the valves.
The function of the first-stage steam ejector injection steam bypass regulating valve 103 and the second-stage steam ejector injection steam pipeline regulating valve 104 is to determine the working state of the second-stage steam ejector 4 by regulating the opening of the valves.
The operation method of the water and electricity cogeneration system for wide-load operation of the power plant comprises an operation mode under high load of the power plant, an operation mode under medium load of the power plant and an operation mode under low load of the power plant, and specifically comprises the following steps:
operating mode under high load of power plant: when the steam discharged by a medium pressure cylinder of a steam turbine unit 1 of a power plant operates above 440kPa, a primary steam ejector 3 and a secondary steam ejector 4 are both in a working state; the primary steam ejector 3 extracts the exhaust steam of the intermediate pressure cylinder of the steam turbine set 1 and ejects the exhaust steam of the low pressure cylinder of the steam turbine set 1; at the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam pipeline regulating valve 102 of the primary steam ejector is opened, the power steam bypass regulating valve 100 of the primary steam ejector is closed, a bypass pipeline is cut off, and the injection steam bypass regulating valve 103 of the primary steam ejector is closed, and a low-pressure steam bypass pipeline is cut off; the secondary steam ejector ejects the steam pipeline regulating valve 104 to open; the primary steam ejector 3 extracts steam of a medium-pressure cylinder of the power plant to eject low-pressure cylinder of the power plant, the outlet steam of the primary steam ejector 3 is used as power steam of the secondary steam ejector 4 to eject steam at the inlet of a seawater condenser 8 in a seawater desalination system, and the outlet steam of the secondary steam ejector 4 passes through a water spray desuperheater 5 and then enters a first-effect evaporator of a transverse pipe falling film evaporator group 6 to be used as heating steam to produce water;
operating mode under load in the power plant: when the steam discharged by the intermediate pressure cylinder of the steam turbine set 1 of the power plant runs at 290 kPa-440 kPa, the high-efficiency work of the primary steam ejector 3 and the secondary steam ejector 4 cannot be ensured under the working condition, so that only the secondary steam ejector 4 is adopted for steam injection; at the moment, the primary steam ejector 3 stops working and enters an equipment shutdown state; the method comprises the following steps that a power steam pipeline regulating valve 101 of a primary steam ejector is closed, a power steam pipeline regulating valve 102 of the primary steam ejector is closed, a power steam bypass regulating valve 103 of the primary steam ejector is closed, all steam pipeline channels of a primary steam ejector 3 are cut off, a power steam bypass regulating valve 100 of the primary steam ejector is opened, a power steam pipeline regulating valve 104 of a secondary steam ejector is opened, steam extracted by a medium pressure cylinder of a power plant steam turbine unit 1 directly enters a power steam pipeline of a secondary steam ejector 4 through the power steam bypass regulating valve 100 of the primary steam ejector, steam at the inlet of a seawater condenser 8 in a seawater desalination system is ejected, and steam at the outlet of the secondary steam ejector 4 passes through a water spray attemperator 5 and then enters a first-effect evaporator of a horizontal tube evaporator group 6 to be used as;
operation mode under the low load of power plant: when the steam discharged by the intermediate pressure cylinder of the steam turbine set 1 of the power plant runs below 290kPa, the performance of the primary steam ejector 3 and the performance of the secondary steam ejector 4 can not be ensured under the working condition, and the primary steam ejector 3 and the secondary steam ejector 4 are both in an equipment closing state; at the moment, the power steam bypass valve 100 of the primary steam ejector is closed, the power steam pipeline regulating valve 101 of the primary steam ejector is closed, the injection steam pipeline regulating valve 102 of the primary steam ejector is closed, and the injection steam bypass regulating valve 103 of the primary steam ejector is opened; the two-stage steam ejector ejects the steam pipeline regulating valve 104 to be closed, the low-pressure extracted steam of the power plant steam turbine unit 1 is directly used for heating steam of the seawater desalination system, and enters the first-effect evaporator of the transverse pipe falling film evaporator group 6 to work to generate fresh water after passing through the water spray desuperheater 5.
Compared with the conventional thermal power generating unit coupled seawater desalination system, the water and electricity cogeneration system with the two-stage steam ejector only needs to add the two-stage steam ejector and other steam pipeline regulating valves (100-104) on the basis of the original thermal power coupled seawater desalination system, and the devices have simple structure, low price and stable performance, so the water and electricity 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 system can flexibly switch the position of the steam source when the load of the power plant changes in a large range, realize the cascade utilization of energy to a greater extent on the premise of ensuring the fresh water yield of the seawater desalination system, and reduce the steam cost of the seawater desalination system.
(2) The used primary steam ejector and the secondary steam ejector do not need to consume other energy, the work is stable, and the safety and the reliability of the equipment are high.
(3) The sea water desalination process adopts the existing mature low-temperature multi-effect distillation technology, the water production ratio is high, the stability is good, and the design and production technology are mature.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The specific implementation mode is as follows:
as shown in fig. 1, the cogeneration system with two-stage steam ejectors of the invention is composed of a steam turbine unit 1, a generator 2, a primary steam ejector 3, a secondary steam ejector 4, a water spray desuperheater 5, a horizontal pipe falling film evaporator group 6, a seawater flash tank group 7, a seawater condenser 8, a material pump 9, a primary steam ejector power steam bypass regulating valve 100, a primary steam ejector power steam pipeline regulating valve 101, a primary steam ejector steam pipeline regulating valve 102, a primary steam ejector steam pipeline regulating valve 103, and a secondary steam ejector steam pipeline regulating valve 104;
the high-temperature high-pressure steam works in the steam turbine unit 1, and the thermoelectric energy is converted through the generator 2; an outlet of a steam exhaust pipeline of a pressure cylinder in the steam turbine unit 1 is communicated with a power steam pipeline of a primary steam ejector 3 through a primary steam ejector power steam regulating valve 101, and is communicated with a power steam pipeline of a secondary steam ejector 4 through a primary steam ejector power steam bypass regulating valve 100; the low-pressure cylinder steam exhaust pipeline of the steam turbine set 1 is communicated with the injection steam pipeline of the primary steam injector through an injection steam pipeline regulating valve 102 of the primary steam injector 3, and is communicated with the outlet steam pipeline of the secondary steam injector 4 through an injection steam bypass regulating valve 103 of the primary steam injector; a power steam inlet of the secondary steam ejector 4 is communicated with a steam pipeline at the outlet of the primary steam ejector 3, and an injection steam pipeline of the secondary steam ejector _4 is communicated with an inlet of the seawater condenser 8 through an injection steam pipeline regulating valve 104 of the secondary steam ejector; an outlet steam pipeline of the secondary steam ejector 4 is communicated with an inlet of a water spray desuperheater 5, and an outlet of the water spray desuperheater 5 is communicated with an inlet of a first-effect evaporator steam pipeline of a transverse pipe falling film evaporator group 6; the seawater outlet of the first-effect evaporator is communicated with the inlet of a first-effect flash tank of the seawater flash tank group 7, secondary steam at the outlet of the first-effect flash tank is communicated with the steam inlet of a next-effect evaporator 10, and seawater at the outlet of the first-effect flash tank is communicated with the inlet of a next-effect flash tank 11; 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 8, the secondary steam outlet of the last flash tank is communicated with the steam inlet of the seawater condenser 8, the fresh water generated by each evaporator is gathered and then flows into the fresh water tank 10, the fresh water outlet of the seawater condenser 8 is communicated with the inlet of the fresh water tank 10, the inlet of the seawater material pump 9 is communicated with the seawater outlet of the seawater condenser 8, and the outlet of the seawater material pump 9 is communicated with the seawater inlet of each evaporator of the horizontal tube evaporator group 6.
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 steam discharged by the intermediate pressure cylinder of the steam turbine unit 1 of the power plant operates above 440kPa, both the primary steam injector 3 and the secondary steam injector 4 are in working states. The primary steam ejector 3 extracts the exhaust steam of the intermediate pressure cylinder of the steam turbine set 1 and ejects the exhaust steam of the low pressure cylinder of the steam turbine set 1; at the moment, the power steam pipeline regulating valve 101 of the primary steam ejector is opened, the injection steam pipeline regulating valve 102 of the primary steam ejector is opened, the power steam bypass regulating valve 100 of the primary steam ejector is closed, a bypass pipeline is cut off, and the injection steam bypass regulating valve 103 of the primary steam ejector is closed, and a low-pressure steam bypass pipeline is cut off; the secondary steam ejector induces the steam line regulator valve 104 to open. The primary steam ejector 3 extracts steam with higher parameters of the power plant to eject steam with lower parameters of the power plant, the outlet steam of the primary steam ejector 3 is used as power steam of the secondary steam ejector 4 to eject steam at the inlet of a seawater condenser 8 in a seawater desalination system, and the outlet steam of the secondary steam ejector 4 passes through a water spray desuperheater 5 and then enters a first-effect evaporator of a transverse pipe falling film evaporator group 6 to be used as heating steam to produce water;
operating mode under load in the power plant: when the exhaust steam of the intermediate pressure cylinder of the steam turbine set 1 of the power plant runs at 290 kPa-440 kPa, the high-efficiency work of the first-stage steam ejector 3 and the second-stage steam ejector 4 cannot be ensured under the working condition, so that only the second-stage steam ejector 4 is adopted for steam ejection. At the moment, the primary steam ejector 3 stops working and enters an equipment shutdown state; the method comprises the following steps that a power steam pipeline regulating valve 101 of a primary steam ejector is closed, a power steam pipeline regulating valve 102 of the primary steam ejector is closed, a power steam bypass regulating valve 103 of the primary steam ejector is closed, all steam pipeline channels of a primary steam ejector 3 are cut off, a power steam bypass regulating valve 100 of the primary steam ejector is opened, a power steam pipeline regulating valve 104 of a secondary steam ejector is opened, steam extracted by a medium pressure cylinder of a power plant steam turbine unit 1 directly enters a power steam pipeline of a secondary steam ejector 4 through the power steam bypass regulating valve 100 of the primary steam ejector, steam at the inlet of a seawater condenser 8 in a seawater desalination system is ejected, and steam at the outlet of the secondary steam ejector 4 passes through a water spray attemperator 5 and then enters a first-effect evaporator of a horizontal tube evaporator group 6 to be used as;
operation mode under the low load of power plant: when the steam discharged by the intermediate pressure cylinder of the steam turbine unit 1 of the power plant runs below 290kPa, the performance of the primary steam ejector 3 and the performance of the secondary steam ejector 4 cannot be ensured under the working condition, and the primary steam ejector 3 and the secondary steam ejector 4 are both in an equipment closing state. At the moment, the power steam bypass valve 100 of the primary steam ejector is closed, the power steam pipeline regulating valve 101 of the primary steam ejector is closed, the injection steam pipeline regulating valve 102 of the primary steam ejector is closed, and the injection steam bypass regulating valve 103 of the primary steam ejector is opened; the two-stage steam ejector ejects the steam pipeline regulating valve 104 to be closed, the low-pressure extracted steam of the power plant steam turbine unit 1 is directly used for heating steam of the seawater desalination system, and enters the first-effect evaporator of the transverse pipe falling film evaporator group 6 to work to generate fresh water after passing through the water spray desuperheater 5.
Claims (5)
1. The utility model provides a water and electricity cogeneration system of power plant wide load operation which characterized in that: the system is composed of a steam turbine set (1), a generator (2), a primary steam ejector (3), a secondary steam ejector (4), a water spray desuperheater (5), a horizontal pipe falling film evaporator set (6), a seawater flash evaporation tank set (7), a seawater condenser (8), a seawater material pump (9), a fresh water tank (10), a primary steam ejector power steam bypass regulating valve (100), a primary steam ejector power steam pipeline regulating valve (101), a primary steam ejector injection steam pipeline regulating valve (102), a primary steam ejector injection steam bypass regulating valve (103) and a secondary steam ejector injection steam pipeline regulating valve (104);
the high-temperature high-pressure steam does work in the steam turbine set (1), and the thermoelectric energy is converted through the generator (2); an outlet of a steam exhaust pipeline of a pressure cylinder in the steam turbine set (1) is communicated with a power steam pipeline of a primary steam ejector (3) through a power steam regulating valve (101) of the primary steam ejector, and is communicated with a power steam pipeline of a secondary steam ejector (4) through a power steam bypass regulating valve (100) of the primary steam ejector; the low-pressure cylinder steam exhaust pipeline of the steam turbine set (1) is communicated with an injection steam pipeline of the primary steam injector (3) through a primary steam injector injection steam pipeline regulating valve (102), and is communicated with an outlet steam pipeline of the secondary steam injector (4) through a primary steam injector injection steam bypass regulating valve (103); a power steam inlet of the secondary steam ejector (4) is communicated with a steam pipeline at the outlet of the primary steam ejector (3), and an injection steam pipeline of the secondary steam ejector (4) is communicated with an inlet of the seawater condenser (8) through an injection steam pipeline regulating valve (104) of the secondary steam ejector; an outlet steam pipeline of the secondary steam ejector (4) is communicated with an inlet of a water spray desuperheater (5), and an outlet of the water spray desuperheater (5) is communicated with an inlet of a steam pipeline of a first-effect evaporator of the horizontal pipe falling film evaporator group (6); the seawater outlet of the first-effect evaporator is communicated with the inlet of a first-effect flash tank of the seawater flash tank group (7), secondary steam at the outlet of the first-effect flash tank is communicated with the steam inlet of the next-effect evaporator, and seawater at the outlet of the first-effect flash tank is communicated with the inlet of the next-effect flash tank; the secondary steam outlet of the previous evaporator is communicated with the steam inlet of the next evaporator, the secondary steam outlet of the flash tank of the previous evaporator is communicated with the steam inlet of the next evaporator, the secondary steam outlet of the last evaporator is communicated with the steam inlet of the seawater condenser (8), the secondary steam outlet of the last flash tank is communicated with the steam inlet of the seawater condenser (8), the fresh water generated by each evaporator is gathered and then flows into the fresh water tank (10), the fresh water outlet of the seawater condenser (8) is communicated with the inlet of the fresh water tank (10), the inlet of the seawater material pump (9) is communicated with the seawater outlet of the seawater condenser (8), and the outlet of the seawater material pump (9) is communicated with the seawater inlet of each evaporator of the horizontal tube evaporator group (6).
2. The cogeneration system of claim 1, wherein said cogeneration system is characterized by: by arranging the primary steam ejector (3) and the secondary steam ejector (4), when the load of a power plant changes in a large range, the cascade utilization of energy is realized to a greater extent on the premise of ensuring the normal work of a seawater desalination system by changing the starting and stopping states of the steam ejectors.
3. The cogeneration system of claim 1, wherein said cogeneration system is characterized by: the primary steam ejector power steam bypass adjusting valve (100), the primary steam ejector power steam pipeline adjusting valve (101) and the primary steam ejector injection steam pipeline adjusting valve (102) are used for determining the working state of the primary steam ejector (3) by adjusting the opening of the valves.
4. The cogeneration system of claim 1, wherein said cogeneration system is characterized by: the primary steam ejector injection steam bypass regulating valve (103) and the secondary steam ejector injection steam pipeline regulating valve (104) are used for determining the working state of the secondary steam ejector (4) by regulating the opening of the valves.
5. The method of operating a cogeneration system for wide load operation of a power plant of any one of claims 1 to 4, 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 steam discharged by a medium pressure cylinder of a steam turbine set (1) of a power plant operates above 440kPa, both the primary steam ejector (3) and the secondary steam ejector (4) are in working states; the primary steam ejector (3) extracts the medium pressure cylinder exhaust steam of the steam turbine set (1) and ejects the low pressure cylinder exhaust steam of the steam turbine set (1); at the moment, a power steam pipeline regulating valve (101) of the primary steam ejector is opened, a jet steam pipeline regulating valve (102) of the primary steam ejector is opened, a power steam bypass regulating valve (100) of the primary steam ejector is closed, a bypass pipeline is cut off, a jet steam bypass regulating valve (103) of the primary steam ejector is closed, and a low-pressure steam bypass pipeline is cut off; the secondary steam ejector ejects a steam pipeline regulating valve (104) to open; the method comprises the following steps that pressure cylinder steam in a steam extraction turbine set of a primary steam ejector (3) ejects low-pressure cylinder steam of the steam extraction turbine set, outlet steam of the primary steam ejector (3) is used as power steam of a secondary steam ejector (4) to eject inlet steam of a seawater condenser (8) in a seawater desalination system, and outlet steam of the secondary steam ejector (4) enters a first-effect evaporator of a transverse pipe falling film evaporator group (6) to be used as heating steam to produce water after passing through a water spraying desuperheater (5);
operating mode under load in the power plant: when the exhaust steam of the intermediate pressure cylinder of the steam turbine set (1) of the power plant runs at 290 kPa-440 kPa, the high-efficiency work of the primary steam ejector (3) and the secondary steam ejector (4) cannot be ensured under the working condition, so that only the secondary steam ejector (4) is adopted for steam ejection; at the moment, the primary steam ejector (3) stops working and enters an equipment shutdown state; the method comprises the steps that a power steam pipeline regulating valve (101) of a primary steam ejector is closed, a power steam pipeline regulating valve (102) of the primary steam ejector is closed, a power steam bypass regulating valve (103) of the primary steam ejector is closed, all steam pipeline channels of a primary steam ejector (3) are cut off, the power steam bypass regulating valve (100) of the primary steam ejector is opened, a power steam pipeline regulating valve (104) of a secondary steam ejector is opened, steam extracted by a medium pressure cylinder of a steam turbine set (1) directly enters a power steam pipeline of the secondary steam ejector (4) through the power steam bypass regulating valve (100) of the primary steam ejector, steam at the inlet of a seawater condenser (8) in a seawater desalination system is ejected, and steam at the outlet of the secondary steam ejector (4) passes through a water spray desuperheater (5), the first-effect evaporator entering a horizontal tube falling film evaporator group (6) is used as heating steam to produce water;
operation mode under the low load of power plant: when the steam discharged by a medium pressure cylinder of a steam turbine set (1) of a power plant runs below 290kPa, the performance of the primary steam ejector (3) and the performance of the secondary steam ejector (4) cannot be ensured under the working condition, and the primary steam ejector (3) and the secondary steam ejector (4) are both in an equipment closing state; at the moment, the power steam bypass valve (100) of the primary steam ejector is closed, the power steam pipeline regulating valve (101) of the primary steam ejector is closed, the injection steam pipeline regulating valve (102) of the primary steam ejector is closed, and the injection steam bypass regulating valve (103) of the primary steam ejector is opened; the two-stage steam ejector is used for ejecting a steam pipeline regulating valve (104) to be closed, low-pressure extraction steam of the steam turbine set (1) is directly used for heating steam of a seawater desalination system, and enters a first-effect evaporator of the transverse pipe falling film evaporator set (6) to work to generate fresh water after passing through the water spray desuperheater (5).
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| CN201911108945.4A CN110847976B (en) | 2019-11-13 | 2019-11-13 | Water-electricity cogeneration system for wide-load operation of power plant and operation method |
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| CN201911108945.4A CN110847976B (en) | 2019-11-13 | 2019-11-13 | Water-electricity cogeneration system for wide-load operation of power plant and operation method |
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| CN110847976B CN110847976B (en) | 2020-10-27 |
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Cited By (3)
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| CN113464225A (en) * | 2021-07-05 | 2021-10-01 | 西安交通大学 | System and method for wide load operation of power plant with two-stage steam ejector |
| CN114856739A (en) * | 2022-05-24 | 2022-08-05 | 华能国际电力股份有限公司 | Hydrothermal electricity cogeneration system based on low-temperature multi-effect evaporation technology |
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