CN114233421B

CN114233421B - Thermoelectric cooperative system integrated with steam injector and operation method

Info

Publication number: CN114233421B
Application number: CN202111538140.0A
Authority: CN
Inventors: 刘荣堂; 李璐阳; 范佩佩; 王宇; 黄蕴哲; 刘明
Original assignee: Ningbo Institute of Innovation of Beihang University
Current assignee: Ningbo Institute of Innovation of Beihang University
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2023-04-28
Anticipated expiration: 2041-12-15
Also published as: CN114233421A

Abstract

A thermoelectric cooperative system integrating steam ejectors and an operation method thereof, wherein the system comprises a boiler, a steam turbine high-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 supply pump and a steam turbine high-pressure heater group which are sequentially communicated; the system also comprises various valves, high-low pressure steam ejectors, high-low temperature heat exchangers, electric heating pumps, high-low temperature heat storage tanks and the like. The high-low pressure steam ejector, the high-low temperature heat exchanger and the electric heating pump do not work in the power peak period, the low-temperature heat storage tank is used for recovering the exhaust waste heat of the steam turbine, and the high-temperature heat storage tank is used for supplying heat to the heat supply network; the high-low pressure steam ejector, the high-low temperature heat exchanger and the electric heating pump are all put into operation in the electric power low-valley period, the working steam of the steam ejector is flexibly and orderly selected according to the heat supply load of the heat supply network, and the high-temperature heat storage tank is used for storing redundant hot water for external heat supply in the electric power peak period. The peak regulation process realizes ordered utilization of energy steps, and has high energy utilization efficiency, large peak regulation depth and flexible parameter adjustment.

Description

Thermoelectric cooperative system integrated with steam injector 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 of an integrated steam ejector and an operation method.

Background

Because wind power and photovoltaic power generation have strong volatility and anti-peak shaving characteristics, the increase of the wind power and photovoltaic power generation duty ratio brings great challenges to peak shaving of a power grid. With the rapid development of clean energy in China, the problem of the new energy power generation is still serious, and phenomena such as wind abandoning, light abandoning and the like are common. At present, the thermal power generation capacity of China is excessive, the annual utilization hours of power generation equipment are low, and the continuous low-load operation or the deep peak regulation operation of the thermal power generating unit can become a normal state in the next years. Therefore, the improvement of the deep peak regulation capability of the thermal power generating unit is a key technology for effectively absorbing renewable energy sources to generate power. The conventional unit depth peak shaving technology at present has the following problems:

(1) The peak regulation modes such as an electric boiler, bypass main steam and cylinder cutting only reduce the power generation output of the unit in the low-peak period of electric power, and in order to improve the heat supply capacity, the unit extracts steam and supplies heat in the peak period of electric power so that the power generation output in the peak period is influenced. Conventional unit peak shaving technology faces practical problems of low energy utilization efficiency, small peak shaving depth and the like.

(2) The existing thermoelectric cooperative system has the problems that the parameter adjustment is not flexible enough, the investment of the absorption heat pump is large, the temperature difference heat exchange process is more, 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 of an integrated steam injector and an operation method thereof, wherein a low-temperature heat storage tank is adopted to fully recover exhaust steam waste heat in a power peak period, a two-stage steam injector is adopted to step jet steam turbine exhaust steam to heat supply network water in a power valley period, and an electric heating pump is adopted to assist in heating, so that the purposes of deep and efficient peak regulation in the power valley period are realized, and meanwhile, the high-temperature heat storage tank is adopted to fully store hot water in the power valley period; according to the invention, working steam of the steam ejector can be flexibly and orderly selected according to the heating load of the local geothermal network in the electric power valley period, and parameters of the steam ejector, the electric heat pump, each heater and the heat storage tank can be efficiently and flexibly adjusted. The invention realizes the flexible and rapid switching of the working modes of the power station system in the peak-valley period, realizes the orderly utilization of energy steps in the peak regulation process, and has the advantages of high energy utilization efficiency, large peak regulation depth and flexible parameter adjustment.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the thermoelectric cooperative system integrating the steam injector comprises a main steam side of a boiler 101, a steam turbine high-pressure cylinder 102, a reheat steam side of the boiler 101, a steam turbine medium-pressure cylinder 103, a steam turbine low-pressure cylinder 104, a steam exhaust valve A207, a condenser 111 shell side, a condensate pump 110, a steam turbine low-pressure heater group 109, a deaerator 108, a feed pump 107 and a steam turbine high-pressure heater group 106 which are sequentially communicated; the method is characterized in that: the pressure of the high-pressure cylinder 102 and the pressure cylinder 103 in the steam turbine is gradually decreased, namely, a # 1- # 4-level 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 injector 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 injector 116 is respectively communicated with the injection steam inlet of the high-pressure steam injector 115 and the hot fluid side inlet of the low-temperature heat exchanger 120 through an injector valve C212 and an injector valve T213; the hot fluid side outlet of the cryogenic heat exchanger 120 is in communication with the deaerator 108; the hot fluid side outlet of the high temperature heat exchanger 117 communicates with the hot fluid side inlet of the low temperature heat exchanger 120; the exhaust pipeline of the low-pressure cylinder 104 of the steam turbine is divided into two paths, one path is communicated with the shell side inlet of the condenser 111 through an exhaust valve A207, and the other path is communicated with the injection steam inlet of the low-pressure steam injector 116 through an exhaust valve B209; the heat supply network water inlet pipeline 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 Wen Guanfa door 216 and the heat supply network water supply pipeline; 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 the low-temperature heat exchanger 120, a cold fluid side of the high-temperature heat exchanger 117, a switching valve C215 and a heat supply network water supply pipeline in sequence; the outlet of the side of the pipe of the condenser 111 is communicated with a high-temperature area of the low-temperature heat storage tank 112; the low temperature area of the high temperature heat storage tank 118 is communicated with the cold fluid side of the high temperature heat exchanger 117 through a high temperature water pump 119, a switching valve 219 and a condenser of an electric heating pump 121 in sequence; the high temperature area of the low temperature heat storage tank 112 is communicated with a heat supply network water inlet pipeline through a switching valve B221, an electric heating pump valve 217, an evaporator of the electric heating pump 121, a switching valve F220 and a low Wen Guanfa valve 208 in sequence; the system also comprises a generator 105 coaxially connected with the low-pressure cylinder 104 of the steam turbine, a heat pump electric switch 114 connected with a power line of the generator 105 through a circuit, and the heat pump electric switch 114 is connected with an electric heating pump 121 through a circuit.

The operation method of the thermoelectric cooperative system of the integrated steam injector comprises the following steps of: closing the first extraction valve 201, the second extraction valve 202, the third extraction valve 203, the fourth extraction valve 204, the fifth extraction valve 205, the third extraction valve 206, the second exhaust valve 209, the first injector valve 210 and the fourth injector valve 213, wherein the low-pressure steam injector 116 and the high-pressure steam injector 115 do not work; and the heat pump switch 114 is disconnected, and the switching valve B221, the switching valve C215, the switching valve T219 and the switching valve T220 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, and regulating a low-temperature water pump 113 to enable heat storage fluid in the low-temperature heat storage tank 112 to be pumped out of a low-temperature area, and simultaneously enabling partial water flow at the outlet of the pipe side of the condenser 111 to be stored in a high-temperature area in the low-temperature heat storage tank 112; the high-temperature water pump 119 is regulated to pump fluid in a pipeline where the high-temperature water pump 119 is positioned into a low-temperature region of the high-temperature heat storage tank 118, and heat storage fluid in the high-temperature region of the high-temperature heat storage tank 118 supplies heat to a heat supply network; adjusting the throughput of the low temperature tank valve 208 and the high temperature tank valve 216 so that the heat supply network water supply parameters and the heat storage fluid parameters stored in the high temperature region of the low temperature heat storage tank 112 maintain a set amount;

during the power valley period: closing the switching valve A214, closing the heat pump electric brake 114, and opening the switching valve B221, the switching valve C215, the switching valve D219 and the switching valve F220, namely the electric heat pump 121, the high-temperature heat exchanger 117 and the low-temperature heat exchanger 120; according to the water supply thermal load of the heat supply network, the steam extraction valve 205, the steam extraction valve 206, the steam extraction valve A201, the steam extraction valve B202, the steam extraction valve C203 or the steam extraction valve D204 are selectively opened; and opens the exhaust valve b 209, the injector valve a 210, and the injector valve d 213, i.e., the low pressure steam injector 116 and the high pressure steam injector 115 are operated; regulating the low-temperature water pump 113 to pump water flow at the outlet of the evaporator of the electric heat pump 121 and part of heat supply network water into a low-temperature area in the low-temperature heat storage tank 112, and discharging high-temperature heat storage fluid from a high-temperature area of the low-temperature heat storage tank 112; the high-temperature water pump 119 is adjusted to pump out the fluid in the low-temperature region of the high-temperature heat storage tank 118 and simultaneously 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 adjustment mode of the system is as follows in the power valley period: the working steam of the high-pressure steam injector 115 is flexibly selected according to the thermal load, namely, the thermal load is divided into 6 grades according to the change from the maximum to the minimum of the thermal load of the water supply of a heating network, and main steam (the steam extraction valve 205 is opened), reheat steam (the steam extraction valve 206 is opened), steam turbine #1 level steam extraction (the steam extraction valve A201 is opened), steam turbine #2 level steam extraction (the steam extraction valve B202 is opened), steam turbine #3 level steam extraction (the steam extraction valve C203 is opened) and steam turbine #4 level steam extraction (the steam extraction valve D204 is opened) are sequentially adopted and only as the working steam of the high-pressure steam injector 115; and within each thermal load level, the low pressure steam injector 116 outlet steam pressure and the high pressure steam injector 115 outlet steam pressure values are all stabilized at optimum values by adjusting injector valve A210, injector valve B211, injector valve C212 and injector valve D213; the condenser outlet water temperature of the electric heat pump 121 is maintained consistent with the cold fluid outlet temperature parameters of the cryogenic heat exchanger 120 by adjusting the high temperature tank valve 216, the switch valve block 219, the electric heat pump valve 217, the switch valve block 220, and the heat exchanger valve 218.

Compared with the prior art, the invention has the following advantages:

(1) The two-stage steam ejector is adopted in the electric power valley period to eject steam discharged by the steam turbine, so that the ordered utilization of energy steps is realized, and the problems of more heat exchange processes, large system investment and the like of the absorption heat pump are avoided.

(2) The working steam of the steam ejector can be flexibly selected according to the actual heat supply load in the electric power valley period, and the heat exchange process system

The loss is small.

(3) The waste heat of the steam turbine exhaust can be fully recovered in the power peak period, and the peak power output and the heat supply output are not influenced; the electric power valley period can realize high-efficiency and deep peak regulation through the steam ejector and the electric heat pump, 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 orderly utilization of energy steps in the peak regulation process, and has the advantages of high energy utilization efficiency, large peak regulation depth and flexible parameter adjustment.

Drawings

FIG. 1 is a schematic diagram of a thermoelectric co-system and method of operation of an integrated vapor injector of the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

In order to realize the cascade utilization of energy sources, the temperatures of a heat source and a heated fluid are reasonably matched in the heat exchange process, and therefore, the invention adopts the technical scheme that the two-stage steam ejector cascade injection steam turbine discharges steam to obtain steam with two different parameters of medium pressure and low pressure, and heat energy with different grades is orderly utilized in the heat exchange process. As shown in fig. 1, the thermoelectric cooperative system integrated with a steam injector of the present invention comprises a main steam side of a boiler 101, a high pressure cylinder 102 of a turbine, a reheat steam side of the boiler 101, a middle pressure cylinder 103 of the turbine, a low pressure cylinder 104 of the turbine, a valve cover 207 of a steam exhaust, a shell side of a condenser 111, a condensate pump 110, a low pressure heater group 109 of the turbine, a deaerator 108, a feed pump 107 and a high pressure heater group 106 of the turbine, which are sequentially communicated; the pressure of the high-pressure cylinder 102 and the pressure cylinder 103 in the steam turbine is gradually decreased, namely, a # 1- # 4-level steam extraction pipeline, a main steam pipeline and a reheat steam pipeline are respectively communicated with the working steam inlet of the high-pressure steam injector 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 a heat supply source during system operation; 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 injector 116 is respectively communicated with the injection steam inlet of the high-pressure steam injector 115 and the hot fluid side inlet of the low-temperature heat exchanger 120 through an injector valve C212 and an injector valve T213; the outlet of the hot fluid side of the cryogenic heat exchanger 120 is communicated with the deaerator 108, and the communication mode enables the drainage of the cryogenic heat exchanger 120 to be recovered in the deaerator 108, so that the energy efficiency of the whole system can be improved; the outlet of the hot fluid side of the high-temperature heat exchanger 117 is communicated with the inlet of the hot fluid side of the low-temperature heat exchanger 120, so that the drain water of the high-temperature heat exchanger 117 is further utilized in the low-temperature heat exchanger 120; the exhaust pipeline of the low-pressure cylinder 104 of the steam turbine is divided into two paths, one path is communicated with the shell side inlet of the condenser 111 through an exhaust valve A207, and the other path is communicated with the injection steam inlet of the low-pressure steam injector 116 through an exhaust valve B209; the heat supply network water inlet pipeline 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 Wen Guanfa door 216 and the heat supply network water supply pipeline; 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 the low-temperature heat exchanger 120, a cold fluid side of the high-temperature heat exchanger 117, a switching valve C215 and a heat supply network water supply pipeline in sequence; the outlet of the side of the pipe of the condenser 111 is communicated with a high-temperature area of the low-temperature heat storage tank 112; the low temperature area of the high temperature heat storage tank 118 is communicated with the cold fluid side of the high temperature heat exchanger 117 through a high temperature water pump 119, a switching valve 219 and a condenser of an electric heating pump 121 in sequence; the high temperature area of the low temperature heat storage tank 112 is communicated with a heat supply network water inlet pipeline through a switching valve B221, an electric heating pump valve 217, an evaporator of the electric heating pump 121, a switching valve F220 and a low Wen Guanfa valve 208 in sequence; the system further comprises a generator 105 coaxially connected with the turbine low pressure cylinder 104, a heat pump electric brake 114 electrically connected with the generator 105 through a circuit power line, and the heat pump electric brake 114 electrically connected with an electric heat pump 121 through a circuit.

As shown in fig. 1, the operation method of the thermoelectric cooperative system integrated with the steam injector of the present invention is that during the peak period of electric power: closing the first extraction valve 201, the second extraction valve 202, the third extraction valve 203, the fourth extraction valve 204, the fifth extraction valve 205, the third extraction valve 206, the second exhaust valve 209, the first injector valve 210 and the fourth injector valve 213, wherein the low-pressure steam injector 116 and the high-pressure steam injector 115 do not work; and the heat pump switch 114 is disconnected, and the switching valve B221, the switching valve C215, the switching valve T219 and the switching valve T220 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, and regulating a low-temperature water pump 113 to enable heat storage fluid in the low-temperature heat storage tank 112 to be pumped out of a low-temperature area, and simultaneously enabling partial water flow at the outlet of the pipe side of the condenser 111 to be stored in a high-temperature area in the low-temperature heat storage tank 112; the high-temperature water pump 119 is regulated to pump fluid in a pipeline where the high-temperature water pump 119 is positioned into a low-temperature region of the high-temperature heat storage tank 118, and heat storage fluid in the high-temperature region of the high-temperature heat storage tank 118 supplies heat to a heat supply network; the throughput of low temperature tank valve 208 and high temperature tank valve 216 is adjusted such that the heat supply network water supply parameters and the thermal storage fluid parameters stored in the high temperature region of low temperature thermal storage tank 112 are maintained at set amounts. When the technical scheme is adopted in the power peak period, the cogeneration unit operates in a pure condensing working condition, and under the condition of guaranteeing rated heat supply output, 100% rated power generation output can be realized at the same time, and the peak regulation upper limit of the thermoelectric unit is widened.

As shown in fig. 1, the operation method of the thermoelectric cooperative system integrated with the steam injector of the present invention is that during the low-power period: closing the switching valve A214, closing the heat pump electric brake 114, and opening the switching valve B221, the switching valve C215, the switching valve D219 and the switching valve F220, namely the electric heat pump 121, the high-temperature heat exchanger 117 and the low-temperature heat exchanger 120; according to the water supply thermal load of the heat supply network, the steam extraction valve 205, the steam extraction valve 206, the steam extraction valve A201, the steam extraction valve B202, the steam extraction valve C203 or the steam extraction valve D204 are selectively opened; and opens the exhaust valve b 209, the injector valve a 210, and the injector valve d 213, i.e., the low pressure steam injector 116 and the high pressure steam injector 115 are operated; regulating the low-temperature water pump 113 to pump water flow at the outlet of the evaporator of the electric heat pump 121 and part of heat supply network water into a low-temperature area in the low-temperature heat storage tank 112, and discharging high-temperature heat storage fluid from a high-temperature area of the low-temperature heat storage tank 112; the high-temperature water pump 119 is adjusted to pump out the fluid in the low-temperature region of the high-temperature heat storage tank 118 and simultaneously 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 electricity low valley period, the cogeneration unit operates under the minimum condensing condition, heat required in the peak period is transferred to the low valley period for production through the heat storage device under the condition of guaranteeing rated heat supply output, meanwhile, the electricity pump further consumes low valley electricity, 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 operation method of the thermoelectric cooperative system of the integrated steam injector comprises the following steps: the working steam of the high-pressure steam injector 115 is flexibly selected according to the thermal load, namely, the thermal load is divided into 6 grades according to the change from the maximum to the minimum of the thermal load of the water supply of a heating network, and main steam (the steam extraction valve 205 is opened), reheat steam (the steam extraction valve 206 is opened), steam turbine #1 level steam extraction (the steam extraction valve A201 is opened), steam turbine #2 level steam extraction (the steam extraction valve B202 is opened), steam turbine #3 level steam extraction (the steam extraction valve C203 is opened) and steam turbine #4 level steam extraction (the steam extraction valve D204 is opened) are sequentially adopted and only as the working steam of the high-pressure steam injector 115; and within each thermal load level, the low pressure steam injector 116 outlet steam pressure and the high pressure steam injector 115 outlet steam pressure values are all stabilized at optimum values by adjusting injector valve A210, injector valve B211, injector valve C212 and injector valve D213; by adjusting the high-temperature tank valve 216, the switching valve block 219, the electric heating pump valve 217, the switching valve block 220 and the heat exchanger valve 218, the outlet water temperature of the condenser of the electric heating pump 121 and the cold fluid of the low-temperature heat exchanger 120 are enabledThe outlet temperature parameters remained consistent. By the operation scheme, the flexible and reasonable matching of the heat supply source and the heat supply load in the electricity valley period is realized, and the heat transfer process is effectively reduced

Loss. />

Claims

1. The thermoelectric cooperative system comprises a main steam side of a boiler (101), a high-pressure cylinder (102) of a steam turbine, a reheat steam side of the boiler (101), a middle-pressure cylinder (103) of the steam turbine, a low-pressure cylinder (104) of the steam turbine, a steam discharge valve A (207), a shell side of a condenser (111), a condensate pump (110), a low-pressure heater group (109) of the steam turbine, a deaerator (108), a feed pump (107) and a high-pressure heater group (106) of the steam turbine, which are sequentially communicated; the method is characterized in that: the pressure of the high-pressure cylinder (102) of the steam turbine and the pressure of the medium-pressure cylinder (103) of the steam turbine are gradually decreased, namely, a fourth-level steam extraction pipeline #1 to #4, a main steam pipeline and a reheat steam pipeline are respectively communicated with a working steam inlet of the high-pressure steam injector (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 C (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 injector (116) is respectively communicated with the injection steam inlet of the high-pressure steam injector (115) and the hot fluid side inlet of the low-temperature heat exchanger (120) through an injector valve C (212) and an injector valve T (213); 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 exhaust pipeline of the low-pressure cylinder (104) of the steam turbine is divided into two paths, one path is communicated with the shell side inlet of the condenser (111) through an exhaust valve A (207), and the other path is communicated with the injection steam inlet of the low-pressure steam injector (116) through an exhaust valve B (209); the heat supply network water inlet pipeline is divided into two paths, and one path is sequentially 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; 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 the low-temperature heat exchanger (120), a cold fluid side of the high-temperature heat exchanger (117), a switching valve C (215) and a heat supply network water supply pipeline in sequence; the outlet at the tube side of the condenser (111) is communicated with a high-temperature area of the low-temperature heat storage tank (112); the low-temperature area of the high-temperature heat storage tank (118) is communicated with the cold fluid side of the high-temperature heat exchanger (117) through a high-temperature water pump (119), a switching valve block (219) and a condenser of the electric heating pump (121) in sequence; 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 heating pump valve (217), an evaporator of an electric heating pump (121), a switching valve F (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, a heat pump electric switch (114) connected with a power transmission line of the generator (105) through a circuit, and the heat pump electric switch (114) is connected with an electric heating pump (121) through a circuit.

2. A method of operating a thermoelectric co-system integrated with a steam injector as set forth in claim 1, wherein: power peak time: closing the steam extraction valve A (201), the steam extraction valve B (202), the steam extraction valve C (203), the steam extraction valve D (204), the steam extraction valve F (205), the steam extraction valve F (206), the steam extraction valve B (209), the injector valve A (210) and the injector valve D (213), namely, the low-pressure steam injector (116) and the high-pressure steam injector (115) do not work; and the heat pump switch (114) is disconnected, the switching valve B (221), the switching valve C (215), the switching valve T (219) and the switching valve F (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), and regulating a low-temperature water pump (113) to enable heat storage fluid in the low-temperature heat storage tank (112) to be pumped out of a low-temperature area, and simultaneously enabling partial water flow at the outlet of the pipe side of the condenser (111) to be stored in a high-temperature area in the low-temperature heat storage tank (112); the high-temperature water pump (119) is regulated to pump fluid in a pipeline where the high-temperature water pump (119) is located into a low-temperature area of the high-temperature heat storage tank (118), and heat storage fluid in the high-temperature area of the high-temperature heat storage tank (118) supplies heat to a heat supply network; adjusting the flow rates of the low-temperature tank valve (208) and the high-temperature tank valve (216) so that 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) maintain a set quantity;

power valley period: closing a switching valve A (214), closing a heat pump electric switch (114), and opening a switching valve B (221), a switching valve C (215), a switching valve D (219) and a switching valve F (220), namely, the electric heat pump (121), the high-temperature heat exchanger (117) and the low-temperature heat exchanger (120) all work; according to the water supply thermal load of the heat supply network, a steam extraction valve (205), a steam extraction valve (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) are selectively opened; and opening the exhaust valve B (209), the ejector valve A (210) and the 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 water flow at the outlet of an evaporator of the electric heat pump (121) and part of heat supply network water into a low-temperature area in the low-temperature heat storage tank (112), and discharging high-temperature heat storage fluid from the high-temperature area of the low-temperature heat storage tank (112); and a high-temperature water pump (119) is regulated, fluid in a low-temperature region of the high-temperature heat storage tank (118) is pumped out, and fluid at a cold fluid side outlet of the high-temperature heat exchanger (117) is stored in a high-temperature region of the high-temperature heat storage tank (118).

3. A method of operating a thermoelectric co-system integrated with a steam injector as set forth in claim 2 wherein: the working steam of the high-pressure steam ejector (115) is flexibly selected according to the thermal load in the electric valley period, namely the thermal load is divided into 6 grades according to the maximum-to-minimum change of the thermal load of the water supply of the thermal network, and main steam, namely an open steam extraction valve (205), reheat steam, namely an open steam extraction valve (206), steam turbine #1 steam extraction, namely an open steam extraction valve A (201), steam turbine #2 steam extraction, namely an open steam extraction valve B (202), steam turbine #3 steam extraction, namely an open steam extraction valve C (203) and steam turbine #4 steam extraction, namely an open steam extraction valve butyl (204) are sequentially adopted and used as the working steam of the high-pressure steam ejector (115); and within each thermal load level, stabilizing the low pressure steam injector (116) outlet steam pressure, the high pressure steam injector (115) outlet steam pressure values at optimum values by adjusting injector valve A (210), injector valve B (211), injector valve C (212) and injector valve D (213); the outlet water temperature of the condenser of the electric heat pump (121) is kept consistent with the cold fluid outlet temperature parameter of the cryogenic heat exchanger (120) by adjusting the height Wen Guanfa valve (216), the switching valve block (219), the electric heat pump valve (217), the switching valve block (220) and the heat exchanger valve (218).