CN114234264B - Thermoelectric cooperative system coupled with steam ejector and operation method - Google Patents

Thermoelectric cooperative system coupled with steam ejector and operation method Download PDF

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Publication number
CN114234264B
CN114234264B CN202111535117.6A CN202111535117A CN114234264B CN 114234264 B CN114234264 B CN 114234264B CN 202111535117 A CN202111535117 A CN 202111535117A CN 114234264 B CN114234264 B CN 114234264B
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valve
temperature
low
steam
pump
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CN114234264A (en
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刘荣堂
黄蕴哲
李璐阳
王宇
范佩佩
刘明
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Ningbo Institute of Innovation of Beihang University
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Ningbo Institute of Innovation of Beihang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1048—Counting of energy consumption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F24D2200/123—Compression type heat pumps
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Abstract

A thermoelectricity cooperative system coupled with a steam ejector and an operation method thereof are disclosed, wherein the system comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-low pressure cylinder, an exhaust valve A, a condenser, a condensate pump, a steam turbine low-pressure heater group, a deaerator, a feed pump and a steam turbine high-pressure heater group which are sequentially communicated; the system also comprises various valves, high-low pressure steam ejectors, absorption heat pumps, high-low temperature heaters, electric heat pumps, high-low temperature heat storage tanks and the like. The high-low pressure steam injector, the high-low temperature heater, the absorption heat pump and the electric heat pump do not work in the power peak period, the low-temperature heat storage tank recovers the exhaust waste heat of the steam turbine, and the high-temperature heat storage tank is used for supplying heat to a heat supply network; the high-low pressure steam ejector, the high-low temperature heater, the absorption heat pump and the electric heat pump all work in the electric power off-peak period, working steam of the steam ejector can be flexibly and orderly selected, and the high-temperature heat storage tank is adopted to store redundant hot water for external heat supply in the electric power peak period. The peak regulation process realizes the ordered utilization of energy in steps, and has large peak regulation depth and flexible parameter regulation.

Description

Thermoelectric cooperative system coupled with steam ejector and operation method
Technical Field
The invention relates to the technical field of thermoelectric cooperation, power station peak shaving and steam ejectors, in particular to a thermoelectric cooperation system coupled with a steam ejector and an operation method.
Background
Because wind power generation and photovoltaic power generation have strong volatility and anti-peak regulation characteristics, the increase of the wind power generation and photovoltaic power generation ratio brings huge challenges to power grid peak regulation. With the rapid development of clean energy in China, the problem of consumption of new energy power generation is still severe, and the phenomena of wind and light abandonment and the like are ubiquitous. At present, the thermal power capacity in China is excessive, the annual utilization hours of power generation equipment is low, and continuous low-load operation or deep peak regulation operation of a thermal power unit in the next years can become a normal state. Therefore, the improvement of the deep peak regulation capability of the thermal power generating unit is a key technology for effectively consuming renewable energy sources for power generation. The conventional unit depth peak regulation technology at present has the following problems:
(1) The peak regulation modes of the electric boiler, the bypass main steam, the cylinder cutting and the like only reduce the generating output of the unit in the power valley period, and in order to improve the heat supply capacity, the generating output in the peak period is influenced by the steam extraction and heat supply of the unit in the power peak period. The conventional unit peak regulation technology faces practical problems of low energy utilization efficiency, small peak regulation depth and the like.
(2) The existing thermoelectric cooperative system has the problems that the parameter adjustment is not flexible enough, the heat source steam selection is not flexible enough, the heat pump driving steam is not further processed, and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a thermoelectric cooperative system coupled with a steam ejector and an operation method thereof, wherein a low-temperature heat storage tank is adopted to fully recover waste steam waste heat in the power peak period, a two-stage steam ejector is adopted to inject steam exhaust of a steam turbine in a stepped mode to heat supply network water in the power valley period, and an electric heat pump is adopted to assist in heating, so that the purposes of deep and efficient peak regulation in the power valley period are achieved, and meanwhile, a high-temperature heat storage tank is adopted to fully store hot water in the power valley period; the invention can flexibly and orderly select the working steam of the steam injector according to the heat supply load of the local heat supply network in the power valley period, and can efficiently and flexibly adjust the parameters of the steam injector, the electric heating pump, the absorption heat pump, each heater and the heat storage tank. The invention realizes the flexible and rapid switching of the working modes of the power station system in the peak-valley period, realizes the ordered utilization of energy in the peak regulation process, and has high energy utilization efficiency, large peak regulation depth and flexible parameter regulation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermoelectricity cooperative system coupled with a steam ejector comprises a main steam side of a boiler 101, a high-pressure steam turbine cylinder 102, a reheated steam side of the boiler 101, a medium-pressure steam turbine cylinder 103, a low-pressure steam turbine cylinder 104, a steam exhaust valve 207, a shell side of a condenser 111, a condensate pump 110, a low-pressure steam turbine heater group 109, a deaerator 108, a feed water pump 107 and a high-pressure steam turbine heater group 106 which are sequentially communicated; four-stage steam extraction pipelines with gradually reduced pressures of the steam turbine high-pressure cylinder 102 and the steam turbine medium-pressure cylinder 103, namely a #1 th to a #4 th-stage steam extraction pipeline, a main steam pipeline and a reheat steam pipeline are respectively communicated with a working steam inlet of the high-pressure steam ejector 115 through a steam extraction valve A201, a steam extraction valve B202, a steam extraction valve C203, a steam extraction valve D204, a steam extraction valve E205 and a steam extraction valve F206; the outlet of the high-pressure steam ejector 115 is divided into two paths after passing through an ejector valve A210, and one path is communicated with the generator inlet of the absorption heat pump 122 through a generator valve 221; the other path of the hot water passes through a high-temperature heater valve 220 and then is sequentially communicated with a hot fluid side of the high-temperature heater 117, a hot fluid side of the low-temperature heater 120 and the deaerator 108; the outlet of the high-pressure steam ejector 115 is communicated with the working steam inlet of the low-pressure steam ejector 116 through an ejector valve B211; the outlet of the low-pressure steam ejector 116 is respectively communicated with the inlet of the injected fluid of the high-pressure steam ejector 115 and the inlet of the hot fluid side of the low-temperature heater 120 through an ejector valve C212 and an ejector valve D213; the steam exhaust pipeline of the steam turbine low-pressure cylinder 104 is divided into three paths, and the first path is communicated with the injected fluid inlet of the low-pressure steam injector 116 through an injector valve penta 209; the second path is communicated with the condensed water outlet pipeline of the condenser 111 through the evaporator valve 223 and the evaporator of the absorption heat pump 122 in sequence and then communicated with the inlet of the condensed water pump 110, and the third path is communicated with the shell side of the condenser 111 through the exhaust valve 207; the water inlet pipe of the heat supply network is divided into two paths, and one path is communicated with the pipe side of the condenser 111, the absorber valve 219, the absorber of the absorption heat pump 122, the condenser of the absorption heat pump 122, the cold fluid side of the high-temperature heater 117, the high-temperature valve 218 and the water supply pipeline of the heat supply network in sequence; the outlet of the condenser 111 on the pipe side is also sequentially communicated with the low-temperature valve 222, the cold fluid side of the low-temperature heater 120, the condenser of the electric heating pump 121, the electric heating pump valve A214, the high-temperature pump 119 and the low-temperature region of the high-temperature heat storage tank 118; the hot fluid side inlet of the low temperature heater 120 is communicated with the generator outlet of the absorption heat pump 122; the high-temperature area of the high-temperature heat storage tank 118 is communicated with a water supply pipeline of a heat supply network through a high-temperature heat storage valve A215; the condenser outlet of the electric heat pump 121 is communicated with the cold fluid side inlet of the high-temperature heater 117; the outlet on the tube side of the condenser 111 is respectively communicated with the inlet of an evaporator of the electric heat pump 121 and the pipelines between the high-temperature pump 119 and the electric heat pump valve A214 through an electric heat pump valve B216 and a high-temperature heat storage valve B217; the other path of the heat supply network water inlet pipeline is communicated with the low-temperature area of the low-temperature heat storage tank 112 through the low-temperature heat storage valve 208 and the low-temperature pump 113 in sequence; the outlet of the condenser 111 on the pipe side is communicated with the high-temperature area of the low-temperature heat storage tank 112; the evaporator outlet of the electric heat pump 121 is communicated with the low-temperature region of the low-temperature heat storage tank 112 through a low-temperature pump 113; the system also comprises a generator 105 coaxially connected with the low-pressure turbine cylinder 104, and a heat pump electric brake 114 connected with the power line of the generator 105 through a circuit, wherein the heat pump electric brake 114 is connected with an electric heat pump 121 through the circuit.
The operation method of the thermoelectricity cooperative system coupled with the steam ejector comprises the following steps: closing an extraction valve A201, an extraction valve B202, an extraction valve C203, an extraction valve D204, an extraction valve E205, an extraction valve F206, an evaporator valve 223, a low-temperature valve 222, an absorber valve 219, an electric heat pump valve B216, an electric heat pump valve A214, a high-temperature valve 218 and an ejector valve E209, and disconnecting a heat pump electric brake 114, namely, a low-pressure steam ejector 116, a high-pressure steam ejector 115, an electric heat pump 121, a high-temperature heater 117 and a low-temperature heater 120 are all not operated; opening a high-temperature heat storage valve B217, adjusting the low-temperature pump 113 to enable heat storage fluid in the low-temperature heat storage tank 112 to be pumped out from a low-temperature area, and simultaneously storing partial water flow at an outlet part at the pipe side of the condenser 111 into a high-temperature area in the low-temperature heat storage tank 112; adjusting the high-temperature pump 119 to pump the fluid in the pipeline where the high-temperature pump 119 is located into the low-temperature region of the high-temperature heat storage tank 118, and simultaneously supplying heat to a heat supply network by the heat storage fluid in the high-temperature region of the high-temperature heat storage tank 118; adjusting the flow rate of the high-temperature heat storage valve A215 and the low-temperature heat storage valve 208 to ensure that the set flow rate of the water supply parameter of the heat supply network and the heat storage fluid parameter stored in the high-temperature area of the low-temperature heat storage tank 112 is maintained;
electric power low ebb period: closing the high-temperature heat storage valve B217, closing the heat pump electric brake 114, and opening the evaporator valve 223, the low-temperature valve 222, the absorber valve 219, the electric heat pump valve B216, the electric heat pump valve A214, the high-temperature valve 218 and the ejector valve E209; according to the size of the heat load of the water supply of the heat supply network, a steam extraction valve A201, a steam extraction valve B202, a steam extraction valve C203, a steam extraction valve D204, a steam extraction valve E205 or a steam extraction valve Z206 is selected to be opened, namely, the low-pressure steam ejector 116, the high-pressure steam ejector 115, the electric heat pump 121, the high-temperature heater 117 and the low-temperature heater 120 are all put into operation; regulating the water flow at the outlet of the evaporator of the electric heating pump 121 and part of the heat supply network water supply by the low-temperature pump 113 to be pumped into the low-temperature area in the low-temperature heat storage tank 112, and simultaneously discharging high-temperature heat storage fluid from the high-temperature area of the low-temperature heat storage tank 112; the high temperature pump 119 is adjusted to pump out the fluid in the low temperature region of the high temperature heat storage tank 118 and store the fluid in the outlet of the cold fluid side of the high temperature heater 117 in the high temperature region of the high temperature heat storage tank 118.
In the electric power low-ebb period, the working steam of the high-pressure steam ejector 115 can be flexibly selected according to the heat load, that is, the heat load is divided into 6 grades according to the change of the heat load of the heat supply network from maximum to minimum, and main steam (an extraction valve penta 205 is opened), reheat steam (an extraction valve hexan 206 is opened), steam extraction of the #1 stage of the steam turbine (an extraction valve A201 is opened), steam extraction of the #2 stage of the steam turbine (an extraction valve B202 is opened), steam extraction of the #3 stage of the steam turbine (an extraction valve C203 is opened), and steam extraction of the #4 stage of the steam turbine (an extraction valve D204 is opened) are respectively and sequentially adopted as the working steam of the high-pressure steam ejector 115; in each heat load level, the steam pressure at the outlet of the low-pressure steam ejector 116 and the steam pressure at the outlet of the high-pressure steam ejector 115 are stabilized at optimal values by adjusting the ejector valve pentane 209, the ejector valve A210, the ejector valve B211, the ejector valve C212 and the ejector valve D213; the temperature of the condenser outlet water of the electric heat pump 121 is kept consistent with the temperature parameter of the cold fluid outlet of the low-temperature heater 120 by adjusting the electric heat pump valve A214, the high-temperature heat storage valve A215, the electric heat pump valve B216, the absorber valve 219, the generator valve 221 and the high-temperature heater valve 220.
Compared with the prior art, the invention has the following advantages:
(1) And in the electric power low-ebb period, a two-stage steam ejector is adopted to eject steam of a steam turbine, so that the energy gradient ordered utilization is realized.
(2) The working steam of the steam ejector can be flexibly selected according to the actual heat supply load during the electric power valley period, and the heat exchange process system
Figure BDA0003412895300000051
The loss is small.
(3) The exhaust waste heat of the steam turbine can be fully recovered in the power peak period, and the peak power output and the heat supply output are not influenced; the high-efficiency and deep peak regulation can be realized through the steam ejector and the electric heat pump in the electric power low-ebb period, and the heat supply load is ensured.
(4) The invention realizes the flexible and rapid switching of the working modes of the power station system in the peak-valley period, realizes the ordered utilization of energy in the peak regulation process, and has high energy utilization efficiency, large peak regulation depth and flexible parameter regulation.
Drawings
FIG. 1 is a schematic diagram of a steam ejector coupled thermal electric synergistic system and method of operation according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order to realize the gradient utilization of energy, the temperature of a heat source and the temperature of heated fluid should be reasonably matched in the heat exchange process, therefore, the invention adopts the technical scheme that a two-stage steam ejector is used for ejecting steam of a steam turbine in a gradient way to obtain steam with two different parameters of medium and low pressure, and the heat energy with different grades is utilized in order in the heat exchange process. As shown in FIG. 1, the invention relates to a steam ejector-coupled heat and power cooperative system, which comprises a main steam side of a boiler 101, a high-pressure steam turbine cylinder 102, a reheat steam side of the boiler 101, a medium-pressure steam turbine cylinder 103, a low-pressure steam turbine cylinder 104, a steam exhaust valve 207, a shell side of a condenser 111, a condensate pump 110, a low-pressure steam turbine heater group 109, a deaerator 108, a feed water pump 107 and a high-pressure steam turbine heater group 106 which are communicated in sequence; four-stage steam extraction pipelines with gradually reduced pressures of the steam turbine high-pressure cylinder 102 and the steam turbine medium-pressure cylinder 103, namely a #1 th to a #4 th-stage steam extraction pipeline, a main steam pipeline and a reheat steam pipeline are respectively communicated with a working steam inlet of the high-pressure steam ejector 115 through a steam extraction valve A201, a steam extraction valve B202, a steam extraction valve C203, a steam extraction valve D204, a steam extraction valve E205 and a steam extraction valve C206, so that conditions are provided for flexible and reasonable selection of heat supply sources during system operation; the outlet of the high-pressure steam ejector 115 is divided into two paths after passing through an ejector valve A210, and one path is communicated with the generator inlet of the absorption heat pump 122 through a generator valve 221; the other path of the water passes through the high-temperature heater valve 220 and then is sequentially communicated with the hot fluid side of the high-temperature heater 117, the hot fluid side of the low-temperature heater 120 and the deaerator 108, and the communication mode enables the drained water of the low-temperature heat exchanger 120 to be recycled in the deaerator 108, so that the overall energy efficiency of the system can be improved; the outlet of the high-pressure steam ejector 115 is communicated with the working steam inlet of the low-pressure steam ejector 116 through an ejector valve B211; the outlet of the low-pressure steam ejector 116 is respectively communicated with the inlet of the injected fluid of the high-pressure steam ejector 115 and the inlet of the hot fluid side of the low-temperature heater 120 through an ejector valve C212 and an ejector valve D213; the steam exhaust pipeline of the steam turbine low-pressure cylinder 104 is divided into three paths, and the first path is communicated with the injected fluid inlet of the low-pressure steam injector 116 through an injector valve penta 209; the second path is communicated with the condensed water outlet pipeline of the condenser 111 through the evaporator valve 223 and the evaporator of the absorption heat pump 122 in sequence and then communicated with the inlet of the condensed water pump 110, and the third path is communicated with the shell side of the condenser 111 through the exhaust valve 207; the water inlet of the heat supply network is divided into two paths, and one path is communicated with the pipe side of the condenser 111, the absorber valve 219, the absorber of the absorption heat pump 122, the condenser of the absorption heat pump 122, the cold fluid side of the high-temperature heater 117, the high-temperature valve 218 and the water supply pipeline of the heat supply network in sequence; the outlet of the condenser 111 on the pipe side is also sequentially communicated with a low-temperature valve 222, the cold fluid side of the low-temperature heater 120, the condenser of the electric heating pump 121, an electric heating pump valve A214, a high-temperature pump 119 and the low-temperature region of the high-temperature heat storage tank 118; the hot fluid side inlet of the low temperature heater 120 is communicated with the generator outlet of the absorption heat pump 122; the high-temperature area of the high-temperature heat storage tank 118 is communicated with a water supply pipeline of a heat supply network through a high-temperature heat storage valve A215; the outlet of the condenser of the electric heat pump 121 is communicated with the inlet of the cold fluid side of the high-temperature heater 117; the outlet of the condenser 111 on the tube side is respectively communicated with the inlet of the evaporator of the electric heat pump 121 and the pipeline between the high-temperature pump 119 and the electric heat pump valve A214 through an electric heat pump valve B216 and a high-temperature heat storage valve B217; the other path of the heat supply network water inlet pipe is communicated with the low-temperature area of the low-temperature heat storage tank 112 through the low-temperature heat storage valve 208 and the low-temperature pump 113 in sequence; the outlet of the condenser 111 on the pipe side is communicated with the high-temperature area of the low-temperature heat storage tank 112; the evaporator outlet of the electric heat pump 121 is communicated with the low-temperature region of the low-temperature heat storage tank 112 through a low-temperature pump 113; the system also comprises a generator 105 coaxially connected with the low-pressure turbine cylinder 104, and a heat pump electric brake 114 connected with the power line of the generator 105 through a circuit, wherein the heat pump electric brake 114 is connected with an electric heat pump 121 through the circuit.
As shown in fig. 1, the operation method of the cogeneration coordination system coupled with the steam ejector of the present invention, the power peak period: closing an extraction valve A201, an extraction valve B202, an extraction valve C203, an extraction valve D204, an extraction valve E205, an extraction valve F206, an evaporator valve 223, a low-temperature valve 222, an absorber valve 219, an electric heat pump valve B216, an electric heat pump valve A214, a high-temperature valve 218 and an ejector valve E209, and disconnecting a heat pump electric brake 114, namely, a low-pressure steam ejector 116, a high-pressure steam ejector 115, an electric heat pump 121, a high-temperature heater 117 and a low-temperature heater 120 are all not operated; opening a high-temperature heat storage valve B217, adjusting the low-temperature pump 113 to enable heat storage fluid in the low-temperature heat storage tank 112 to be pumped out from a low-temperature area, and simultaneously storing water flow at an outlet part on the pipe side of the condenser 111 into a high-temperature area in the low-temperature heat storage tank 112; adjusting a high-temperature pump 119 to pump fluid in a pipeline where the high-temperature pump 119 is located into a low-temperature region of the high-temperature heat storage tank 118, and meanwhile, supplying heat to a heat supply network by heat storage fluid in a high-temperature region of the high-temperature heat storage tank 118; the flow rates of the high-temperature heat storage valve A215 and the low-temperature heat storage valve 208 are adjusted, so that the set flow rate of the heat supply network water supply parameter and the heat storage fluid parameter stored in the high-temperature area of the low-temperature heat storage tank 112 is maintained. When the technical scheme is adopted in the power peak period, the cogeneration unit operates in the pure condensation working condition, 100% rated power generation output can be realized under the condition of ensuring the rated heat supply output, and the generated energy is unchanged when the heat is increased, so that the thermoelectric decoupling is realized, and the peak regulation upper limit of the thermoelectric unit is widened.
As shown in fig. 1, the operation method of the cogeneration cooperative system coupled with the steam ejector of the present invention, during the power valley period: closing the high-temperature heat storage valve B217, closing the heat pump electric brake 114, and opening the evaporator valve 223, the low-temperature valve 222, the absorber valve 219, the electric heat pump valve B216, the electric heat pump valve A214, the high-temperature valve 218 and the ejector valve E209; according to the size of the heat load of the water supply of the heat supply network, a steam extraction valve A201, a steam extraction valve B202, a steam extraction valve C203, a steam extraction valve D204, a steam extraction valve E205 or a steam extraction valve Z206 is selected to be opened, namely, the low-pressure steam ejector 116, the high-pressure steam ejector 115, the electric heat pump 121, the high-temperature heater 117 and the low-temperature heater 120 are all put into operation; adjusting a low-temperature pump 113 to pump the water flow at the outlet of the evaporator of the electric heating pump 121 and part of the supply water of the heat supply network into a low-temperature area in the low-temperature heat storage tank 112, and simultaneously discharging high-temperature heat storage fluid from a high-temperature area in the low-temperature heat storage tank 112; the high temperature pump 119 is adjusted to pump out the fluid in the low temperature region of the high temperature heat storage tank 118 and store the fluid in the outlet of the cold fluid side of the high temperature heater 117 in the high temperature region of the high temperature heat storage tank 118. When the technical scheme is adopted in the power valley period, the cogeneration unit operates in the minimum condensing working condition, under the condition of ensuring the rated heat supply output, the heat required in the peak period is transferred to the valley period for production through the heat storage device, simultaneously, the valley power is further consumed through the electric heat pump, the power generation output of the system is further reduced, the peak regulation lower limit of the thermoelectric unit is widened, and the deep peak regulation of the thermoelectric unit is realized.
As shown in fig. 1, in the operation method of the cogeneration coordination system of the coupled steam ejector according to the present invention, during the power off-peak period, the working steam of the high pressure steam ejector 115 can be flexibly selected according to the thermal load, that is, according to the change of the thermal load of the heat supply network from the maximum to the minimum, the thermal load is divided into 6 grades, and the working steam of the high pressure steam ejector 115 is respectively and sequentially adopted and only adopts the main steam (open steam extraction valve pent 205), the reheat steam (open steam extraction valve hex 206), the steam extraction of the #1 stage of the steam turbine (open steam extraction valve first 201), the steam extraction of the #2 stage of the steam turbine (open steam extraction valve second 202), the steam extraction of the #3 stage of the steam turbine (open steam extraction valve third 203), and the steam extraction of the #4 stage of the steam turbine (open steam extraction valve mitt 204); in each heat load level, the steam pressure at the outlet of the low-pressure steam ejector 116 and the steam pressure at the outlet of the high-pressure steam ejector 115 are stabilized at optimal values by adjusting the ejector valve penta 209, the ejector valve A210, the ejector valve B211, the ejector valve C212 and the ejector valve D213; the temperature of the condenser outlet water of the electric heat pump 121 is kept consistent with the temperature parameter of the cold fluid outlet of the low-temperature heater 120 by adjusting the electric heat pump valve A214, the high-temperature heat storage valve A215, the electric heat pump valve B216, the absorber valve 219, the generator valve 221 and the high-temperature heater valve 220. By the operation scheme, the flexible and reasonable matching of the heat supply heat source and the heat supply load in the power valley period is realized, and the heat transfer in the heat transfer process is effectively reduced
Figure BDA0003412895300000091
And (4) loss.

Claims (3)

1. A thermoelectricity cooperative system coupled with a steam ejector comprises a main steam side of a boiler (101), a high-pressure steam cylinder (102) of a steam turbine, a reheating steam side of the boiler (101), a medium-pressure steam cylinder (103) of the steam turbine, a low-pressure steam cylinder (104) of the steam turbine, a steam exhaust valve (207), a shell side of a condenser (111), a condensate pump (110), a low-pressure steam turbine heater group (109), a deaerator (108), a feed pump (107) and a high-pressure steam turbine heater group (106) which are communicated in sequence; the method is characterized in that: four-stage steam extraction pipelines with gradually decreased pressure of a steam turbine high-pressure cylinder (102) and a steam turbine intermediate-pressure cylinder (103), namely #1 to # 4-stage steam extraction pipelines, a main steam pipeline and a reheating steam pipeline are respectively communicated with a working steam inlet of a high-pressure steam ejector (115) through a steam extraction valve A (201), a steam extraction valve B (202), a steam extraction valve C (203), a steam extraction valve D (204), a steam extraction valve E (205) and a steam extraction valve F (206); the outlet of the high-pressure steam ejector (115) is divided into two paths after passing through an ejector valve A (210), and one path is communicated with the generator inlet of the absorption heat pump (122) through a generator valve (221); the other path of the high-temperature heat exchange fluid passes through a high-temperature heater valve (220) and is sequentially communicated with a heat fluid side of a high-temperature heater (117), a heat fluid side of a low-temperature heater (120) and a deaerator (108); the outlet of the high-pressure steam ejector (115) is communicated with the working steam inlet of the low-pressure steam ejector (116) through an ejector valve B (211); the outlet of the low-pressure steam ejector (116) is respectively communicated with the injected fluid inlet of the high-pressure steam ejector (115) and the hot fluid side inlet of the low-temperature heater (120) through an ejector valve C (212) and an ejector valve D (213); the steam exhaust pipeline of the steam turbine low-pressure cylinder (104) is divided into three paths, and the first path is communicated with an injected fluid inlet of the low-pressure steam injector (116) through an injector valve penta (209); the second path is communicated with the condensed water outlet pipeline of the condenser (111) through an evaporator valve (223) and an evaporator of the absorption heat pump (122) in sequence and then communicated with the inlet of the condensed water pump (110), and the third path is communicated with the shell side of the condenser (111) through a steam exhaust valve (207); the water inlet pipe of the heat supply network is divided into two paths, and one path is communicated with the pipe side of the condenser (111), the absorber valve (219), the absorber of the absorption heat pump (122), the condenser of the absorption heat pump (122), the cold fluid side of the high-temperature heater (117), the high-temperature valve (218) and the water supply pipeline of the heat supply network in sequence; the outlet of the condenser (111) on the pipe side is also sequentially communicated with a low-temperature valve (222), the cold fluid side of a low-temperature heater (120), the condenser of an electric heating pump (121), an electric heating pump valve A (214), a high-temperature pump (119) and the low-temperature region of a high-temperature heat storage tank (118); a hot fluid side inlet of the low-temperature heater (120) is communicated with a generator outlet of the absorption heat pump (122); a high-temperature area of the high-temperature heat storage tank (118) is communicated with a water supply pipeline of a heat supply network through a high-temperature heat storage valve A (215); the outlet of the condenser of the electric heat pump (121) is communicated with the cold fluid side inlet of the high-temperature heater (117); the outlet of the condenser (111) on the tube side is also respectively communicated with the inlet of an evaporator of the electric heat pump (121) and the pipeline between the high-temperature pump (119) and the electric heat pump valve A (214) through an electric heat pump valve B (216) and a high-temperature heat storage valve B (217); the other path of the heat supply network water inlet pipe is communicated with a low-temperature area of the low-temperature heat storage tank (112) through a low-temperature heat storage valve (208) and a low-temperature pump (113) in sequence; the pipe side outlet of the condenser (111) is communicated with a high-temperature area of the low-temperature heat storage tank (112); an evaporator outlet of the electric heating pump (121) is communicated with a low-temperature area of the low-temperature heat storage tank (112) through a low-temperature pump (113); the system also comprises a generator (105) coaxially connected with the low-pressure cylinder (104) of the steam turbine, and a heat pump electric brake (114) connected with the power line of the generator (105) through a circuit, wherein the heat pump electric brake (114) is connected with the electric heat pump (121) through the circuit.
2. The method of claim 1, wherein the method further comprises the step of: during the peak period of electric power: closing an extraction valve A (201), an extraction valve B (202), an extraction valve C (203), an extraction valve D (204), an extraction valve E (205), an extraction valve I (206), an evaporator valve (223), a low-temperature valve (222), an absorber valve (219), an electric heat pump valve B (216), an electric heat pump valve A (214), a high-temperature valve (218) and an ejector valve E (209), and disconnecting a heat pump electric brake (114), namely a low-pressure steam ejector (116), a high-pressure steam ejector (115), an electric heat pump (121), a high-temperature heater (117) and a low-temperature heater (120) from working; opening a high-temperature heat storage valve B (217), adjusting a low-temperature pump (113) to enable heat storage fluid in the low-temperature heat storage tank (112) to be pumped out from a low-temperature area, and simultaneously storing water flow at an outlet part on the pipe side of a condenser (111) into a high-temperature area in the low-temperature heat storage tank (112); adjusting a high-temperature pump (119) to pump fluid in a pipeline where the high-temperature pump (119) is located into a low-temperature area of a high-temperature heat storage tank (118), and meanwhile, supplying heat to a heat supply network by heat storage fluid in a high-temperature area of the high-temperature heat storage tank (118); adjusting the flow rate of a high-temperature heat storage valve A (215) and a low-temperature heat storage valve (208) to ensure that the set amount of the water supply parameters of the heat supply network and the heat storage fluid parameters stored in the high-temperature area of the low-temperature heat storage tank (112) is maintained;
electric power low ebb period: closing a high-temperature heat storage valve B (217), closing a heat pump electric brake (114), and opening an evaporator valve (223), a low-temperature valve (222), an absorber valve (219), an electric heat pump valve B (216), an electric heat pump valve A (214), a high-temperature valve (218) and an ejector valve E (209); according to the size of the water supply heat load of the heat supply network, an extraction valve A (201), an extraction valve B (202), an extraction valve C (203), an extraction valve D (204), an extraction valve E (205) or an extraction valve I (206) is selected to be opened, namely a low-pressure steam ejector (116), a high-pressure steam ejector (115), an electric heating pump (121), a high-temperature heater (117) and a low-temperature heater (120) are all put into operation; regulating a low-temperature pump (113) to pump the water flow at the outlet of an evaporator of an electric heating pump (121) and part of the water supply of a heat supply network into a low-temperature area in the low-temperature heat storage tank (112), and simultaneously discharging high-temperature heat storage fluid from a high-temperature area of the low-temperature heat storage tank (112); and adjusting a high-temperature pump (119), pumping out the low-temperature region fluid of the high-temperature heat storage tank (118), and storing the fluid at the outlet of the cold fluid side of the high-temperature heater (117) into the high-temperature region of the high-temperature heat storage tank (118).
3. The method of claim 2, wherein the method further comprises: in the electric power low-ebb period, working steam of a high-pressure steam ejector (115) is flexibly selected according to heat load, namely, according to the change of the heat load of a heat supply network from maximum to minimum, the heat load is divided into 6 grades, and main steam, namely an extraction valve penta (205), reheat steam, namely an extraction valve hexa (206), steam extraction of the #1 stage of a steam turbine, namely an extraction valve A (201), steam extraction of the #2 stage of the steam turbine, namely an extraction valve B (202), steam extraction of the #3 stage of the steam turbine, namely an extraction valve C (203), and steam extraction of the #4 stage of the steam turbine, namely an extraction valve D (204) are respectively and sequentially adopted and are used as the working steam of the high-pressure steam ejector (115);
and in each heat load level, the outlet steam pressure of the low-pressure steam ejector (116) and the outlet steam pressure of the high-pressure steam ejector (115) are stabilized at optimal values by adjusting the ejector valve penta (209), the ejector valve A (210), the ejector valve B (211), the ejector valve C (212) and the ejector valve D (213); the temperature of the outlet water of the condenser of the electric heating pump (121) is consistent with the temperature parameter of the outlet cold fluid of the low-temperature heater (120) by adjusting the electric heating pump valve A (214), the high-temperature heat storage valve A (215), the electric heating pump valve B (216), the absorber valve (219), the generator valve (221) and the high-temperature heater valve (220).
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