CN114233421A - Thermoelectric cooperative system integrated with steam ejector and operation method - Google Patents
Thermoelectric cooperative system integrated with steam ejector and operation method Download PDFInfo
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- CN114233421A CN114233421A CN202111538140.0A CN202111538140A CN114233421A CN 114233421 A CN114233421 A CN 114233421A CN 202111538140 A CN202111538140 A CN 202111538140A CN 114233421 A CN114233421 A CN 114233421A
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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
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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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- 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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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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
- F01K21/00—Steam engine plants not otherwise provided for
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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]
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Abstract
A thermoelectricity cooperative system of an integrated steam ejector and an operation method thereof are provided, wherein the system comprises a boiler, a steam turbine high-pressure and medium-low pressure cylinder, a steam exhaust valve A, a condenser, a condensate pump, a steam turbine low-pressure heater group, a deaerator, a water feed pump and a steam turbine high-pressure heater group which are sequentially communicated; the system also comprises various valves, a high-low pressure steam ejector, a high-low temperature heat exchanger, an electric heating pump, a high-low temperature heat storage tank and the like. The high-low pressure steam injector, the high-low temperature heat exchanger and the electric heat pump do not work at the power peak time, the low-temperature heat storage tank recovers the waste heat of the steam turbine exhaust, 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 heat exchanger and the electric heating pump all work in the electric power off-peak period, working steam of the steam ejector is flexibly and orderly selected according to heat supply load of a heat supply network, and a high-temperature heat storage tank is adopted to store excessive hot water for external heat supply in the electric power peak period. The peak regulation process realizes the ordered utilization of energy in a cascade mode, and has the advantages of high energy utilization efficiency, large peak regulation depth and flexible parameter regulation.
Description
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 integrated 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 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 key technology for effectively consuming renewable energy power generation is to improve the deep peak regulation capability of the thermal power generating unit. 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 of inflexible parameter adjustment, large investment of an absorption heat pump, more temperature difference heat exchange processes, inflexible heat source steam selection, no further treatment of heat pump driving steam 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 integrating a steam ejector and an operation method, wherein a low-temperature heat storage tank is adopted to fully recover waste steam waste heat in the peak period of electric power, 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 valley period of electric power, and an electric heat pump is adopted to assist in heating, so that the purposes of deep and efficient peak regulation in the valley period of electric power are achieved, and meanwhile, a high-temperature heat storage tank is adopted to fully store hot water in the valley period of electric power; the invention can flexibly and orderly select the working steam of the steam ejector 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 ejector, the electric heating 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 integrated 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 A207, 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; the method is characterized in that: a four-stage steam extraction pipeline with gradually reduced pressure of the high-pressure cylinder 102 and the steam turbine intermediate-pressure cylinder 103, namely a #1 to #4 stage steam extraction pipeline, a main steam pipeline and a reheating 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; the outlet of the high-pressure steam ejector 115 is respectively communicated with the hot fluid side inlet of the high-temperature heat exchanger 117 and the working steam inlet of the low-pressure steam ejector 116 through an ejector valve A210 and an ejector valve B211; the outlet of the low-pressure steam ejector 116 is respectively communicated with the injection steam inlet of the high-pressure steam ejector 115 and the hot fluid side inlet of the low-temperature heat exchanger 120 through an ejector valve C212 and an ejector valve D213; the hot fluid side outlet of the low-temperature heat exchanger 120 is communicated with the deaerator 108; the hot fluid side outlet of the high temperature heat exchanger 117 is communicated with the hot fluid side inlet of the low temperature heat exchanger 120; the steam exhaust pipeline of the steam turbine low-pressure cylinder 104 is divided into two paths, one path is communicated with the shell side inlet of the condenser 111 through a steam exhaust valve A207, and the other path is communicated with the injection steam inlet of the low-pressure steam ejector 116 through a steam exhaust valve B209; the water inlet pipeline of the heat supply network is divided into two paths, and one path is sequentially communicated with the pipe side of the condenser 111, the switching valve A214, the high-temperature water pump 119, the high-temperature heat storage tank 118, the high-temperature tank valve 216 and the water supply pipeline of the heat supply network; the other path is communicated with a low-temperature tank valve 208, a low-temperature water pump 113, a low-temperature heat storage tank 112, a switching valve B221, a heat exchanger valve 218, a cold fluid side of a low-temperature heat exchanger 120, a cold fluid side of a high-temperature heat exchanger 117, a switching valve C215 and a heat supply network water supply pipeline in sequence; the pipe side outlet of the condenser 111 is communicated with the high-temperature area of the low-temperature heat storage tank 112; the low-temperature region of the high-temperature heat storage tank 118 is communicated with the cold fluid side of the high-temperature heat exchanger 117 sequentially through a high-temperature water pump 119, a switching valve keeper 219 and a condenser of an electric heat pump 121; the high-temperature area of the low-temperature heat storage tank 112 is communicated with a heat supply network water inlet pipeline sequentially through a switching valve B221, an electric heating pump valve 217, an evaporator of an electric heating pump 121, a switching valve V220 and a low-temperature tank valve 208; the system also comprises a generator 105 coaxially connected with the turbine low pressure 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 a circuit.
The operation method of the steam ejector integrated thermoelectric cooperative system 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 exhaust valve B209, an ejector valve A210 and an ejector valve D213, namely the low-pressure steam ejector 116 and the high-pressure steam ejector 115 do not work; the heat pump electric brake 114 is switched off, and the switching valve B221, the switching valve C215, the switching valve D219 and the switching valve V220 are closed, namely the electric heat pump 121, the high-temperature heat exchanger 117 and the low-temperature heat exchanger 120 do not work; opening a switching valve A214, adjusting a low-temperature water pump 113 to pump out heat storage fluid in the low-temperature heat storage tank 112 from a low-temperature area, and simultaneously storing partial water flow at the pipe side outlet part of the condenser 111 into a high-temperature area in the low-temperature heat storage tank 112; adjusting the high-temperature water pump 119 to pump the fluid in the pipeline where the high-temperature water 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 low-temperature tank valve 208 and the high-temperature tank valve 216 to maintain the set quantity 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;
in the electric power low ebb period: closing the switching valve A214, closing the heat pump electric brake 114, opening the switching valve B221, the switching valve C215, the switching valve D219 and the switching valve E220, namely the electric heat pump 121, the high-temperature heat exchanger 117 and the low-temperature heat exchanger 120 work; according to the size of the heat load of the water supply of the heat supply network, selectively opening an extraction valve penta 205, an extraction valve Hei 206, an extraction valve A201, an extraction valve B202, an extraction valve C203 or an extraction valve D204; and opening the steam exhaust valve B209, the ejector valve A210 and the ejector valve D213, namely the low-pressure steam ejector 116 and the high-pressure steam ejector 115 work; regulating the low-temperature water pump 113 to pump the water flow at the outlet of the evaporator of the electric heat pump 121 and part of the heat supply network water 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; and adjusting a high-temperature water pump 119 to pump out the fluid in the low-temperature region of the high-temperature heat storage tank 118 and store the fluid at the outlet of the cold fluid side of the high-temperature heat exchanger 117 in the high-temperature region of the high-temperature heat storage tank 118.
The parameter adjusting mode in the electric power low ebb period is as follows: working steam of the high-pressure steam ejector 115 is flexibly selected according to heat load, namely, according to the change of the heat load of the heat supply network from maximum to minimum, the heat load is divided into 6 grades, 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 thermal load level, the pressure values of the steam at the outlet of the low-pressure steam ejector 116 and the steam at the outlet of the high-pressure steam ejector 115 are stabilized at optimal values by adjusting an ejector valve A210, an ejector valve B211, an ejector valve C212 and an ejector valve D213; the temperature of the condenser outlet water of the electric heating pump 121 is kept consistent with the temperature parameter of the cold fluid outlet of the low-temperature heat exchanger 120 by adjusting the high-temperature tank valve 216, the switching valve keeper 219, the electric heating pump valve 217, the switching valve keeper 220 and the heat exchanger valve 218.
Compared with the prior art, the invention has the following advantages:
(1) in the electric power off-peak period, the two-stage steam ejector is adopted to inject the steam turbine to exhaust steam, so that the cascade ordered utilization of energy is realized, and the problems of multiple heat exchange processes, large system investment and the like of an absorption heat pump are avoided.
(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
The loss is small.
(3) The exhaust waste heat of the steam turbine can be fully recovered in the power peak period, and the power output and the heat supply output in the peak 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 integrated 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 steam ejector integrated heat and power cooperative system of the present invention comprises a main steam side of a boiler 101, a high pressure turbine cylinder 102, a reheated steam side of the boiler 101, a medium pressure turbine cylinder 103, a low pressure turbine cylinder 104, a steam exhaust valve nail 207, a shell side of a condenser 111, a condensate pump 110, a low pressure turbine heater group 109, a deaerator 108, a feed water pump 107 and a high pressure turbine heater group 106, which are sequentially connected; the four-stage steam extraction pipelines with gradually reduced pressures of the high-pressure cylinder 102 and the steam turbine intermediate pressure cylinder 103, namely a #1 to a #4 stage steam extraction pipeline, a main steam pipeline and a reheating 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 flexibly and reasonably selecting a heat supply source when the system operates; the outlet of the high-pressure steam ejector 115 is respectively communicated with the hot fluid side inlet of the high-temperature heat exchanger 117 and the working steam inlet of the low-pressure steam ejector 116 through an ejector valve A210 and an ejector valve B211; the outlet of the low-pressure steam ejector 116 is respectively communicated with the injection steam inlet of the high-pressure steam ejector 115 and the hot fluid side inlet of the low-temperature heat exchanger 120 through an ejector valve C212 and an ejector valve D213; the outlet of the hot fluid side of the low-temperature heat exchanger 120 is communicated with the deaerator 108, and the communication mode enables the drainage of the low-temperature heat exchanger 120 to be recovered in the deaerator 108, so that the overall energy efficiency of the system can be improved; a hot fluid side outlet of the high-temperature heat exchanger 117 is communicated with a hot fluid side inlet of the low-temperature heat exchanger 120, so that the hydrophobic property of the high-temperature heat exchanger 117 can be further utilized in the low-temperature heat exchanger 120; the steam exhaust pipeline of the steam turbine low-pressure cylinder 104 is divided into two paths, one path is communicated with the shell side inlet of the condenser 111 through a steam exhaust valve A207, and the other path is communicated with the injection steam inlet of the low-pressure steam ejector 116 through a steam exhaust valve B209; the water inlet pipeline of the heat supply network is divided into two paths, and one path is sequentially communicated with the pipe side of the condenser 111, the switching valve A214, the high-temperature water pump 119, the high-temperature heat storage tank 118, the high-temperature tank valve 216 and the water supply pipeline of the heat supply network; the other path is communicated with a low-temperature tank valve 208, a low-temperature water pump 113, a low-temperature heat storage tank 112, a switching valve B221, a heat exchanger valve 218, a cold fluid side of a low-temperature heat exchanger 120, a cold fluid side of a high-temperature heat exchanger 117, a switching valve C215 and a heat supply network water supply pipeline in sequence; the pipe side outlet of the condenser 111 is communicated with the high-temperature area of the low-temperature heat storage tank 112; the low-temperature region of the high-temperature heat storage tank 118 is communicated with the cold fluid side of the high-temperature heat exchanger 117 sequentially through a high-temperature water pump 119, a switching valve keeper 219 and a condenser of an electric heat pump 121; the high-temperature area of the low-temperature heat storage tank 112 is communicated with a heat supply network water inlet pipeline sequentially through a switching valve B221, an electric heating pump valve 217, an evaporator of an electric heating pump 121, a switching valve V220 and a low-temperature tank valve 208; the system also comprises a generator 105 coaxially connected with the turbine low pressure cylinder 104, a heat pump electric brake 114 connected with the power line of the generator 105 through a circuit, and the heat pump electric brake 114 passes through the circuit and an electric heat pump 121.
As shown in fig. 1, the present invention is a method of operating a steam ejector integrated cogeneration system, during peak power periods: 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 exhaust valve B209, an ejector valve A210 and an ejector valve D213, namely the low-pressure steam ejector 116 and the high-pressure steam ejector 115 do not work; the heat pump electric brake 114 is switched off, and the switching valve B221, the switching valve C215, the switching valve D219 and the switching valve V220 are closed, namely the electric heat pump 121, the high-temperature heat exchanger 117 and the low-temperature heat exchanger 120 do not work; opening a switching valve A214, adjusting a low-temperature water pump 113 to pump out heat storage fluid in the low-temperature heat storage tank 112 from a low-temperature area, and simultaneously storing partial water flow at the pipe side outlet part of the condenser 111 into a high-temperature area in the low-temperature heat storage tank 112; adjusting the high-temperature water pump 119 to pump the fluid in the pipeline where the high-temperature water 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; the flow rates of the low temperature tank valve 208 and the high temperature tank valve 216 are adjusted so that the set values of the heat supply network water supply parameter and the heat storage fluid parameter stored in the high temperature region of the low temperature heat storage tank 112 are maintained. When the technical scheme is adopted in the power peak period, the cogeneration unit operates in the pure condensation working condition, and can realize 100 percent rated power generation output under the condition of ensuring the rated heat supply output, thereby widening the peak regulation upper limit of the cogeneration unit.
As shown in fig. 1, the operation method of the steam ejector integrated heat and power cooperative system of the present invention comprises the following steps in the electric power valley period: closing the switching valve A214, closing the heat pump electric brake 114, opening the switching valve B221, the switching valve C215, the switching valve D219 and the switching valve E220, namely the electric heat pump 121, the high-temperature heat exchanger 117 and the low-temperature heat exchanger 120 work; according to the size of the heat load of the water supply of the heat supply network, selectively opening an extraction valve penta 205, an extraction valve Hei 206, an extraction valve A201, an extraction valve B202, an extraction valve C203 or an extraction valve D204; and opening the steam exhaust valve B209, the ejector valve A210 and the ejector valve D213, namely the low-pressure steam ejector 116 and the high-pressure steam ejector 115 work; regulating the low-temperature water pump 113 to pump the water flow at the outlet of the evaporator of the electric heat pump 121 and part of the heat supply network water 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; and adjusting a high-temperature water pump 119 to pump out the fluid in the low-temperature region of the high-temperature heat storage tank 118 and store the fluid at the outlet of the cold fluid side of the high-temperature heat exchanger 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 production in the valley period through the heat storage device, and simultaneously, the electric power in the valley period is further consumed through the electric heat pump, so that 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, the invention relates to an operation method of a steam ejector integrated heat and power cooperative system, which comprises the following parameter regulation modes in the power valley period: the working steam of the high-pressure steam ejector 115 is flexibly selected according to the heat load, namely, the heat load is divided into 6 grades according to the change from the maximum to the minimum of the heat load of the heat supply network, and the working steam is respectively and sequentially adopted and only adopts the main steam (the steam extraction valve is opened) and then the main steam is adopted (the steam extraction valve is opened) againThe hot steam (the steam extraction valve is opened to obtain 206), the steam turbine # 1 stage steam extraction (the steam extraction valve is opened to obtain 201), the steam turbine # 2 stage steam extraction (the steam extraction valve is opened to obtain 202), the steam turbine # 3 stage steam extraction (the steam extraction valve is opened to obtain 203), and the steam turbine # 4 stage steam extraction (the steam extraction valve is opened to obtain 204) are used as the working steam of the high-pressure steam ejector 115; in each thermal load level, the pressure values of the steam at the outlet of the low-pressure steam ejector 116 and the steam at the outlet of the high-pressure steam ejector 115 are stabilized at optimal values by adjusting an ejector valve A210, an ejector valve B211, an ejector valve C212 and an ejector valve D213; the temperature of the condenser outlet water of the electric heating pump 121 is kept consistent with the temperature parameter of the cold fluid outlet of the low-temperature heat exchanger 120 by adjusting the high-temperature tank valve 216, the switching valve keeper 219, the electric heating pump valve 217, the switching valve keeper 220 and the heat exchanger valve 218. 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
And (4) loss.
Claims (3)
1. A thermoelectricity cooperative system integrated with a steam ejector comprises a main steam side of a boiler (101), a high-pressure steam cylinder (102) of a steam turbine, a reheated 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 A (207), a shell side of a condenser (111), a condensate pump (110), a low-pressure steam turbine heater group (109), a deaerator (108), a water feed pump (107) and a high-pressure steam turbine heater group (106) which are communicated in sequence; the method is characterized in that: a four-stage steam extraction pipeline with gradually reduced pressure of a high-pressure cylinder (102) and a medium-pressure cylinder (103) of the steam turbine, namely a #1 to #4 stage steam extraction pipeline, a main steam pipeline and a reheat 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 Hei (206); the outlet of the high-pressure steam ejector (115) is respectively communicated with the hot fluid side inlet of the high-temperature heat exchanger (117) and the working steam inlet of the low-pressure steam ejector (116) through an ejector valve A (210) and an ejector valve B (211); the outlet of the low-pressure steam ejector (116) is respectively communicated with an injection steam inlet of the high-pressure steam ejector (115) and a hot fluid side inlet of the low-temperature heat exchanger (120) through an ejector valve C (212) and an ejector valve D (213); the hot fluid side outlet of the low-temperature heat exchanger (120) is communicated with a deaerator (108); the hot fluid side outlet of the high temperature heat exchanger (117) is communicated with the hot fluid side inlet of the low temperature heat exchanger (120); the steam exhaust pipeline of the steam turbine low-pressure cylinder (104) is divided into two paths, one path is communicated with the shell side inlet of the condenser (111) through a steam exhaust valve A (207), and the other path is communicated with the injection steam inlet of the low-pressure steam ejector (116) through a steam exhaust valve B (209); the heat supply network water inlet pipeline is divided into two paths, and one path of the heat supply network water inlet pipeline is communicated with the pipe side of the condenser (111), the switching valve A (214), the high-temperature water pump (119), the high-temperature heat storage tank (118), the high-temperature tank valve (216) and the heat supply network water supply pipeline in sequence; the other path is communicated with a low-temperature tank valve (208), a low-temperature water pump (113), a low-temperature heat storage tank (112), a switching valve B (221), a heat exchanger valve (218), a cold fluid side of a low-temperature heat exchanger (120), a cold fluid side of a high-temperature heat exchanger (117), a switching valve C (215) and a heat supply network water supply pipeline 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); a low-temperature area of the high-temperature heat storage tank (118) is communicated with a cold fluid side of the high-temperature heat exchanger (117) sequentially through a high-temperature water pump (119), a switching valve gate (219) and a condenser of an electric heat pump (121); the high-temperature area of the low-temperature heat storage tank (112) is communicated with a heat supply network water inlet pipeline sequentially through a switching valve B (221), an electric heat pump valve (217), an evaporator of an electric heat pump (121), a switching valve E (220) and a low-temperature tank valve (208); 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. A method of operating a steam ejector integrated cogeneration system, as defined in claim 1, wherein: 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 Z (206), an exhaust valve B (209), an ejector valve A (210) and an ejector valve D (213), namely a low-pressure steam ejector (116) and a high-pressure steam ejector (115) do not work; and the heat pump electric brake (114) is disconnected, the switching valve B (221), the switching valve C (215), the switching valve D (219) and the switching valve E (220) are closed, namely the electric heat pump (121), the high-temperature heat exchanger (117) and the low-temperature heat exchanger (120) do not work; opening a switching valve A (214), adjusting a low-temperature water pump (113) to pump out heat storage fluid in the low-temperature heat storage tank (112) from a low-temperature area, and simultaneously storing partial water flow at the pipe side outlet part of a condenser (111) into a high-temperature area in the low-temperature heat storage tank (112); adjusting a high-temperature water pump (119) to pump fluid in a pipeline where the high-temperature water pump (119) is located into a low-temperature area of a high-temperature heat storage tank (118), and simultaneously 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 low-temperature tank valve (208) and a high-temperature tank valve (216) 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 switching valve A (214), closing a heat pump electric brake (114), opening a switching valve B (221), a switching valve C (215), a switching valve D (219) and a switching valve E (220), namely an electric heat pump (121), a high-temperature heat exchanger (117) and a low-temperature heat exchanger (120) work; according to the size of the heat load of the water supply of the heat supply network, selectively opening a steam extraction valve penta (205), a steam extraction valve Hei (206), a steam extraction valve A (201), a steam extraction valve B (202), a steam extraction valve C (203) or a steam extraction valve D (204); opening a steam exhaust valve B (209), an ejector valve A (210) and an ejector valve D (213), namely, the low-pressure steam ejector (116) and the high-pressure steam ejector (115) work; regulating a low-temperature water pump (113) to pump the water flow at the outlet of an evaporator of an electric heating pump (121) and part of the water supplied by 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 water pump (119), pumping out the fluid in the low-temperature area of the high-temperature heat storage tank (118), and storing the fluid at the outlet of the cold fluid side of the high-temperature heat exchanger (117) in the high-temperature area of the high-temperature heat storage tank (118).
3. The method of claim 2, wherein the method further comprises the step of: 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 an ejector valve A (210), an ejector valve B (211), an ejector valve C (212) and an ejector valve D (213); the temperature of the outlet water of the condenser of the electric heating pump (121) is kept consistent with the temperature parameter of the outlet of the cold fluid of the low-temperature heat exchanger (120) by adjusting a high-temperature tank valve (216), a switching valve gate valve (219), an electric heating pump valve (217), a switching valve gate (220) and a heat exchanger valve (218).
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