CN111706897B - Thermoelectric double-drive heat pump system for storing waste heat of power plant in winter and summer by utilizing soil cross-season - Google Patents

Abstract

The invention discloses a thermoelectric double-drive heat pump system for storing the winter and summer waste heat of a power plant by soil in a cross-season manner, which comprises a steam turbine, a condenser, a steam type absorption heat pump, a heat exchanger, an electric compression heat pump, a hot water type absorption heat pump, a soil heat exchanger, a circulating water pump, a connecting pipeline and a valve, wherein the specific heat supply method comprises the following steps: the power plant constructs a series cascade heating process to recover the waste heat of the exhaust steam of the steam turbine in winter, and simultaneously drives a thermoelectric double-drive unit arranged in the heating station to extract the soil storage waste heat for supplying heat by using high-temperature heat supply network water and electric power, and stores the waste heat of the exhaust steam of the power plant recovered by low-temperature return water in the soil of the heating station in summer. The thermoelectric double-drive unit reduces the temperature of the return water of the heat supply network while storing and taking the waste heat of the exhaust steam. The system has the advantages that: the dual purposes of the heat supply network in winter and summer and the supply of the dead steam in winter and summer are realized, and the heat supply capacity of the power plant and the utilization rate of the heat supply network are improved; the thermoelectric double-drive unit stores and takes waste heat, reduces the return water temperature of a heat supply network and reduces the heat supply energy consumption of the system; the investment and the occupation area of the heat supplementing system are saved, and the economical efficiency of the system is improved.

Description

Thermoelectric double-drive heat pump system for storing waste heat of power plant in winter and summer by utilizing soil cross-season

Technical Field

The invention relates to the field of waste steam and waste heat utilization of power plants, in particular to a thermoelectric double-drive heat pump system for storing waste heat of power plants in winter and summer by utilizing soil in a seasonal mode.

Background

Coal-fired cogeneration is the main mode of central heating in China, has good heat supply economical efficiency and still occupies a leading position for a long time. However, with the continuous expansion of heat supply scale, the environmental protection pressure of coal-fired heat supply is large, and the promotion of clean coal-fired heat supply is urgent. The waste steam and the residual heat generated by the coal-fired power plant are large, clean and low in heat supply cost, and if the waste steam and the residual heat can be efficiently recycled, the method has great significance for building a clean urban heat supply system.

However, research in the present stage mainly focuses on efficient utilization of the waste heat of the power plant in winter. In the prior art, national patent No. 201810422739.X (named as a heating system coupling waste heat of a power plant with industrial waste heat) and national patent No. 201821213468.9 (named as a high-backpressure heat supply and power generation cogeneration system of a steam turbine) adopt an absorption heat pump technology and a high-backpressure technology respectively, and can recycle partial waste steam and waste heat of the power plant in winter, but the recovery rate is low. Compared with the winter, the steam turbine of the power plant operates under the pure condensing working condition in summer, the generated waste steam has larger heat quantity and higher grade, but the waste steam and the waste heat cannot be effectively utilized due to the difficulty in matching with hot users. On the other hand, although the existing mature 'large temperature difference' heat supply technology can improve the economical efficiency of the pipe network to a certain extent, the idle of the pipe network assets and the conveying capacity in summer becomes a technical bottleneck, and the economical efficiency of the centralized heat supply pipe network cannot be fundamentally improved. In summary, if the waste steam and the waste heat of the power plant can be recycled in summer and the use of a heat supply network is developed, the dual purposes of supplying the waste steam and the waste heat of the power plant in winter and summer and supplying the waste steam and the waste heat of the power plant in pipe network in winter and summer are realized, and the heat supply capacity and the economical efficiency of the system are greatly improved.

Under the large background of clean heat supply, the utilization of geothermal energy is an important development direction, but the problem of soil heat imbalance exists when the soil source heat pump system is applied to cold and hot unbalanced areas, and the long-term stable operation of the system is seriously restricted. National patent No. 201721755072.2 (entitled solar cross-season heat accumulating type soil source heat pump system) proposes to store solar energy to supplement heat to soil, thereby solving the problem of soil heat imbalance. Although solar energy is a clean energy source and has wide sources, the energy flow density is low, the energy flow density is intermittent, the influence of weather is large, and the heat extraction is unstable. In addition, the solar heat collector has large area and high cost, which causes poor system economy. The waste steam and the waste heat of the power plant are clean energy, and compared with solar energy, the source is stable, the waste heat is large and the quality is excellent, and the solar energy is an ideal heat supplementing heat source. The waste steam waste heat is supplied through the centralized heat supply network, so that the problems of dual purposes of a pipe network in winter and summer and dual supply of the waste heat of the power plant in winter and summer are solved, the deep utilization of the waste steam waste heat of the power plant is realized, and the heat supply capacity of a steam turbine is greatly improved; on the other hand, the occupied area of the concurrent heating system is greatly reduced, the investment of the concurrent heating system is saved, and the utilization rate and the overall economy of the cogeneration system are obviously improved.

Disclosure of Invention

The invention aims to provide a thermoelectric double-drive heat pump system for storing the winter and summer waste heat of a power plant by utilizing soil in different seasons, and solves the problems that a heat network is dual-purpose in winter and summer, the waste heat of the power plant is recycled in winter and summer, the temperature of return water of a primary network is reduced while the waste heat of the power plant is stored and obtained, and the like.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a thermoelectric double-drive heat pump system for storing the waste heat of power plants in winter and summer by using soil in different seasons, which comprises: the system comprises a steam turbine for extracting steam and exhaust steam, a condenser for recovering the waste heat of the exhaust steam, a steam type absorption heat pump for heating a primary network, a third heat exchanger for exchanging heat between the extracted steam and the primary network, an electric compression heat pump, a hot water type absorption heat pump, a first heat exchanger for exchanging heat between a primary heat network and a secondary heat network, a second heat exchanger for exchanging heat between heat network water and circulating water, and a soil heat exchanger for exchanging heat with soil;

the condenser comprises a condenser exhaust steam inlet, a condenser exhaust steam condensate outlet, a condenser heat supply network water inlet and a condenser heat supply network water outlet;

the steam type absorption heat pump comprises a steam type absorption heat pump generator inlet, a steam type absorption heat pump generator outlet, a steam type absorption heat pump evaporator inlet, a steam type absorption heat pump evaporator outlet, a steam type absorption heat pump absorber inlet and a steam type absorption heat pump condenser outlet;

the third heat exchanger comprises a third heat exchanger steam extraction inlet, a third heat exchanger steam extraction condensed water outlet, a third heat exchanger heat supply network water inlet and a third heat exchanger heat supply network water outlet;

the electric compression type heat pump comprises an electric compression type heat pump condenser inlet, an electric compression type heat pump condenser outlet, an electric compression type heat pump evaporator outlet and an electric compression type heat pump evaporator inlet; wherein, the export of electric compression heat pump evaporator and electric compression heat pump evaporator entry are each other general, and at summer heat supply network water and soil circulating water system's working process, electric compression heat pump evaporator export becomes the import of actual rivers, and electric compression heat pump evaporator entry then becomes the export of actual rivers.

The hot water type absorption heat pump comprises a hot water type absorption heat pump absorber inlet, a hot water type absorption heat pump condenser outlet, a hot water type absorption heat pump evaporator inlet, a hot water type absorption heat pump generator inlet and a hot water type absorption heat pump generator outlet;

the first heat exchanger comprises a first heat exchanger secondary net water inlet, a first heat exchanger secondary net water outlet, a first heat exchanger primary net water inlet and a first heat exchanger primary net water outlet;

the second heat exchanger comprises a second heat exchanger circulating water side inlet, a second heat exchanger circulating water side outlet, a second heat exchanger heat supply network water outlet and a second heat exchanger heat supply network water inlet;

the soil heat exchanger comprises a soil heat exchanger inlet and a soil heat exchanger outlet;

under the working condition of heat supply in winter, for a steam system, extraction steam generated by the steam turbine is divided into two paths through a pipeline P1 and a pipeline P3: one path of extracted steam is communicated with an inlet of the steam type absorption heat pump generator through a pipeline P4, and an outlet of the steam type absorption heat pump generator returns to an original condensate system of the power plant through a pipeline P5; the other path of extracted steam is communicated with the extracted steam inlet of the third heat exchanger through a pipeline P6, and the extracted steam condensate outlet of the third heat exchanger returns to the original condensate system of the power plant through a pipeline P7; wherein the pipeline P3, the pipeline P4 and the pipeline P6 are respectively provided with a valve V1, a valve V3 and a valve V4; the exhaust steam generated by the steam turbine is communicated to the exhaust steam inlet of the condenser through a pipeline P8 and a pipeline P9, and the exhaust steam condensate outlet of the condenser returns to the original exhaust steam condensate system of the power plant through a pipeline P10;

for a heat network water system, a pipeline P11 for primary network backwater is communicated with a condenser heat network water inlet through a pipeline P12, a pipeline P13 and a pipeline P14, a condenser heat network water outlet is communicated with a steam type absorption heat pump absorber inlet through a pipeline P15, a pipeline P16, a pipeline P19, a pipeline P22 and a pipeline P23, a condenser outlet of the steam type absorption heat pump is communicated with a third heat exchanger heat network water inlet through a pipeline P24, a pipeline P26 and a pipeline P27, a third heat exchanger heat network water outlet is communicated with a pipeline P30 for primary network water supply through a pipeline P28, a pipeline P30 hot water pipeline P31 is communicated with an inlet of the absorption heat pump generator, an outlet of the hot water type absorption heat pump generator is communicated with a first heat exchanger primary network water inlet through a pipeline P32, and a first heat exchanger primary network water outlet is communicated with a second heat exchanger water inlet through a pipeline P33, the second heat exchanger heat supply network water outlet is connected to the pipeline P11 through a pipeline P34, and the pipeline P11 is provided with a second circulating water pump; the inlet of the steam-type absorption heat pump evaporator is communicated with the joint of the pipeline P19 and the pipeline P22 through a pipeline P20, and the outlet of the steam-type absorption heat pump evaporator is communicated with the joint of the pipeline P11 and the pipeline P12 through a pipeline P21;

a pipeline P35 for secondary network backwater is communicated with the inlet of the electric compression heat pump condenser through a pipeline P36, the outlet of the electric compression heat pump condenser is communicated with the inlet of the hot water type absorption heat pump absorber through a pipeline P37 and a pipeline P38, the outlet of the hot water type absorption heat pump condenser is communicated with the secondary network water inlet of the first heat exchanger through a pipeline P39, and the secondary network water outlet of the first heat exchanger is communicated with a pipeline P40 for secondary network water supply;

wherein the pipeline P11, the pipeline P13, the pipeline P16, the pipeline P20, the pipeline P21, the pipeline P23, the pipeline P24, the pipeline P27, the pipeline P28, the pipeline P30, the pipeline P31, the pipeline P34, the pipeline P35 and the pipeline P38 are respectively provided with a valve V5, a valve V6, a valve V7, a valve V10, a valve V11, a valve V12, a valve V13, a valve V15, a valve V16, a valve V18, a valve V19, a valve V20, a valve V21 and a valve V22;

for a soil circulating water system, the outlet of the soil heat exchanger is communicated with the circulating water side inlet of the second heat exchanger through a pipeline P41, a pipeline P42 and a pipeline P43, the circulating water side outlet of the second heat exchanger is communicated with the inlet of the hot water type absorption heat pump evaporator through a pipeline P44, the outlet of the hot water type absorption heat pump evaporator is communicated with the inlet of the electric compression type heat pump evaporator through a pipeline P45 and a pipeline P46, and the outlet of the electric compression type heat pump evaporator is communicated with the inlet of the soil heat exchanger through a pipeline P47, a pipeline P48 and a pipeline P49; wherein the pipeline P41, the pipeline P43, the pipeline P45, the pipeline P47, the pipeline P48 and the pipeline P49 are respectively provided with a valve V23, a valve V24, a valve V25, a valve V26, a valve V27 and a valve V28; a first circulating water pump for providing power for a circulating water system is arranged on the pipeline P49;

under the summer heat storage working condition, the system further comprises a pipeline P25, a pipeline P29, a pipeline P50, a pipeline P51, a pipeline P52, a pipeline P53, a pipeline P54 and a pipeline P55;

for a water system with heat supply network water and soil circulating water, the pipeline P11 for primary network backwater is communicated with the water inlet of the condenser heat supply network through the pipeline P12, the pipeline P13 and the pipeline P14, the water outlet of the condenser heat supply network is communicated with the pipeline P50 through the pipeline P15, the pipeline P16, the pipeline P19, the pipeline P22, the pipeline P25, the pipeline P26, the pipeline P29 and the pipeline P30, and the pipeline P50 is divided into two paths: one path is communicated with the inlet of the electric compression heat pump condenser through the pipeline P51 and the pipeline P36, and the outlet of the electric compression heat pump condenser is communicated with the inlet of the soil heat exchanger through the pipeline P37, the pipeline P52 and the pipeline P49; the other path is communicated with the outlet of the electric compression type heat pump evaporator through a pipeline P53 and a pipeline P47, the inlet of the electric compression type heat pump evaporator is communicated with the pipeline P46 and a pipeline P54 in sequence, the pipeline P54 and the pipeline P41 are communicated with the pipeline P42 together, and the pipeline P42 is communicated with the pipeline P11 through the pipeline P55;

the pipeline P25, the pipeline P29, the pipeline P50, the pipeline P51, the pipeline P52, the pipeline P53, the pipeline P54 and the pipeline P55 are respectively provided with a valve V14, a valve V17, a valve V29, a valve V30, a valve V31, a valve V32, a valve V33 and a valve V34.

Furthermore, the pipeline P14 and the pipeline P15 are respectively communicated to the cooling tower through a pipeline P18 and a pipeline P17, the pipeline P17 and the pipeline P18 are respectively provided with a valve V8 and a valve V9, and the heat dissipation capacity of the cooling tower is controlled by adjusting the opening degrees of the valve V8 and the valve V9.

Furthermore, a pipeline P17 is communicated with the pipeline P9, the tail end of the pipeline P17 is communicated with the air cooling island, a valve V8 is arranged on the pipeline P17, and the heat dissipation capacity of the air cooling island is controlled by adjusting the opening degree of the valve V8.

Further, the steam turbine can be one group, two groups or multiple groups, and can be a wet cooling unit, an indirect air cooling unit or a direct air cooling unit.

Further, the soil heat exchanger adopts a multi-pipe series connection or parallel connection mode.

Furthermore, the soil heat exchanger is made of a U-shaped pipe or a spiral pipe.

Further, the device comprises a pipeline P56, a pipeline P57, a valve V35, a valve V36, a valve V37 and a valve V38; two ends of the pipeline P56 are respectively communicated with the pipeline P35 and the pipeline P38, two ends of the pipeline P57 are respectively communicated with the outlet 63 of the hot water type absorption heat pump evaporator and the pipeline P49, and a water outlet of the pipeline P57 is located between the valve V27 and the first circulating water pump;

the valve V35 is arranged on the pipeline P56, the valve V36 is arranged on the pipeline P36 and is positioned at the downstream of the water inlet of the pipeline P56, and the valve V37 is arranged on the pipeline P37 and is positioned at the upstream of the water outlet of the pipeline P56; the valve V38 is arranged on the pipeline P57.

Compared with the prior art, the invention has the beneficial technical effects that:

the novel combined heat and power generation exhaust steam waste heat utilization and the heat and power dual-drive soil source heat pump are organically combined, on the basis that all the exhaust steam waste heat in winter of the power plant is recovered, the summer exhaust steam waste heat of the power plant is stored for heat supply in a cross-season mode, and the heat supply capacity of the power plant is further improved.

The system simultaneously solves the technical bottleneck problems of recycling of the waste heat of the power plant in winter and summer and dual-purpose of the heat supply network in winter and summer, realizes deep utilization of the waste heat of the power plant in winter and summer and improves the utilization rate of the centralized heat supply network.

And thirdly, through improving the heat supply flow of the heating power station system, the temperature of the return water of the primary network is reduced while heat is stored and taken, on one hand, favorable conditions are created for the power plant to recover the waste steam and waste heat, on the other hand, the transmission and distribution capacity of the network is improved, and the energy consumption of the heating system is greatly reduced.

And because an additional heat compensation system is not needed, the investment of the heat compensation system is saved, the economical efficiency of the system is obviously improved, and the occupied area of the heat compensation system is greatly saved.

Fifthly, the waste heat of the exhaust steam of the power plant is used as a heat supplementing heat source of the soil, the source is sufficient and stable, the cleaning is realized, the heat supply cost is low, the heat storage grade is adjustable and controllable, and a new way is provided for solving the heat balance problem of the soil in winter and summer.

Sixth, in winter, the soil heat exchange circulating water is preheated and then enters the absorption heat pump, and the heating performance of the heat pump is improved.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

Fig. 1 is a flow chart of a thermoelectric double-drive heat pump system for storing the residual heat of a power plant in winter and summer by using soil in a cross-season manner according to an embodiment of the invention;

fig. 2 is a flowchart of a thermoelectric double-drive heat pump system for storing the residual heat of the power plant in winter and summer by using soil in different seasons according to a second embodiment of the present invention;

fig. 3 is a flowchart of a thermoelectric double-drive heat pump system for storing the residual heat of the power plant in winter and summer by using soil in a cross-season manner in the third embodiment of the present invention.

Description of reference numerals: 1. a steam turbine; 2. a condenser; 21. a dead steam inlet of the condenser; 22. an exhaust steam condensate outlet of the condenser; 23. a condenser heat supply network water inlet; 24. a condenser heat supply network water outlet; 3. a steam-type absorption heat pump; 31. an inlet of a steam-type absorption heat pump generator; 32. an outlet of a steam-type absorption heat pump generator; 33. an inlet of a steam type absorption heat pump evaporator; 34. an outlet of the evaporator of the steam-type absorption heat pump; 35. an inlet of a steam-type absorption heat pump absorber; 36. an outlet of a condenser of the steam type absorption heat pump; 4. a third heat exchanger; 41. a third heat exchanger extraction steam inlet; 42. a third heat exchanger steam extraction condensed water outlet; 43. a third heat exchanger heat supply network water inlet; 44. a third heat exchanger heat supply network water outlet; 5. an electrically-driven compression heat pump; 51. an inlet of an electric compression heat pump condenser; 52. an outlet of the condenser of the electric compression heat pump; 53. an outlet of the electric compression type heat pump evaporator; 54. an electrically-driven compression heat pump evaporator inlet; 6. a hot water type absorption heat pump; 61. an inlet of a hot water type absorption heat pump absorber; 62. the outlet of the condenser of the hot water type absorption heat pump; 63. an outlet of the hot water type absorption heat pump evaporator; 64. an inlet of a hot water type absorption heat pump evaporator; 65. an inlet of a hot water type absorption heat pump generator; 66. an outlet of a hot water type absorption heat pump generator; 7. a first heat exchanger; 71. a first heat exchanger secondary net water inlet; 72. a secondary net water outlet of the first heat exchanger; 73. a primary network water inlet of the first heat exchanger; 74. a primary net water outlet of the first heat exchanger; 8. a second heat exchanger; 81. a circulating water side inlet of the second heat exchanger; 82. a circulating water side outlet of the second heat exchanger; 83. a second heat exchanger heat supply network water outlet; 84. a second heat exchanger heat supply network water inlet; 9. a soil heat exchanger; 91. an inlet of a soil heat exchanger; 92. an outlet of the soil heat exchanger; 10. a first circulating water pump; 11. and a second circulating water pump.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

Example one

As shown in fig. 1, the embodiment discloses a thermoelectric double-drive heat pump system for storing the winter and summer waste heat of a power plant by using soil in a cross-season manner, which includes a steam turbine 1 for providing steam extraction and exhaust steam, a condenser 2 for recovering the exhaust steam waste heat, a steam type absorption heat pump 3 for heating a primary network, a third heat exchanger 4 for exchanging heat between the steam extraction and the primary network, an electric compression heat pump 5, a hot water type absorption heat pump 6, a first heat exchanger 7 for exchanging heat between a primary heat network and a secondary heat network, a second heat exchanger 8 for exchanging heat between water in the heat network and circulating water, and a soil heat exchanger 9 for exchanging heat with the soil.

In this embodiment, for a system with a higher heat supply parameter (such as a radiator) in the secondary grid, the steam turbine 1 includes at least one steam turbine set, and the steam turbine set is a wet cooling set or an indirect air cooling set. The third heat exchanger 4 is a steam-water type heat exchanger, and the first heat exchanger 7 and the second heat exchanger 8 are water-water type heat exchangers.

The condenser 2 comprises a condenser exhaust steam inlet 21, a condenser exhaust steam condensate outlet 22, a condenser heat supply network water inlet 23 and a condenser heat supply network water outlet 24. The steam type absorption heat pump 3 comprises a steam type absorption heat pump generator inlet 31, a steam type absorption heat pump generator outlet 32, a steam type absorption heat pump evaporator inlet 33, a steam type absorption heat pump evaporator outlet 34, a steam type absorption heat pump absorber inlet 35 and a steam type absorption heat pump condenser outlet 36. The third heat exchanger 4 comprises a third heat exchanger extraction steam inlet 41, a third heat exchanger extraction condensation water outlet 42, a third heat exchanger heat supply network water inlet 43 and a third heat exchanger heat supply network water outlet 44. The electric compression heat pump 5 includes an electric compression heat pump condenser inlet 51, an electric compression heat pump condenser outlet 52, an electric compression heat pump evaporator outlet 53, and an electric compression heat pump evaporator inlet 54. The hot water type absorption heat pump 6 includes a hot water type absorption heat pump absorber inlet 61, a hot water type absorption heat pump condenser outlet 62, a hot water type absorption heat pump evaporator outlet 63, a hot water type absorption heat pump evaporator inlet 64, a hot water type absorption heat pump generator inlet 65, and a hot water type absorption heat pump generator outlet 66. The first heat exchanger 7 comprises a first heat exchanger secondary net water inlet 71, a first heat exchanger secondary net water outlet 72, a first heat exchanger primary net water inlet 73 and a first heat exchanger primary net water outlet 74. The second heat exchanger 8 comprises a second heat exchanger circulating water side inlet 81, a second heat exchanger circulating water side outlet 82, a second heat exchanger heat network water outlet 83, and a second heat exchanger heat network water inlet 84. The soil heat exchanger 9 comprises a soil heat exchanger inlet 91, a soil heat exchanger outlet 92. The soil heat exchanger 9 adopts the form of multitube series connection or parallel connection, and the soil heat exchanger 9 adopts the preparation of U-shaped pipe or spiral pipe, and in this embodiment, the soil heat exchanger 9 adopts the preparation of U-shaped pipe.

(1) Under the working condition of heat supply in winter, for a steam system, a part of steam extracted by a medium pressure cylinder of the steam turbine 1 enters a low pressure cylinder through a pipeline P2, a part of steam extracted by the medium pressure cylinder enters a pipeline P3, and the extracted steam enters a pipeline P3 and then is divided into two paths: one path of extracted steam is communicated with the inlet 31 of the steam type absorption heat pump generator through a pipeline P4, and the outlet 32 of the steam type absorption heat pump generator returns to the original condensed water system of the power plant through a pipeline P5; the other path of extracted steam is communicated with a third heat exchanger extracted steam inlet 41 through a pipeline P6, and a third heat exchanger extracted steam condensate outlet 42 returns to the original condensate system of the power plant through a pipeline P7. Wherein the pipeline P2, the pipeline P3, the pipeline P4 and the pipeline P6 are respectively provided with a valve V2, a valve V1, a valve V3 and a valve V4. The exhaust steam generated by the steam turbine 1 is communicated to the exhaust steam inlet 21 of the condenser through a pipeline P8 and a pipeline P9, and the exhaust steam condensate outlet 22 of the condenser returns to the original exhaust steam condensate system of the power plant through a pipeline P10.

For a heat network water system, a pipeline P11 for primary network backwater flows into a condenser heat network water inlet 23 through a pipeline P12, a pipeline P13 and a pipeline P14, a condenser heat network water outlet 24 is communicated with a steam type absorption heat pump absorber inlet 35 through a pipeline P15, a pipeline P16, a pipeline P19, a pipeline P22 and a pipeline P23, a steam type absorption heat pump condenser outlet 36 is communicated with a third heat exchanger heat network water inlet 43 through a pipeline P24, a pipeline P26 and a pipeline P27, a third heat exchanger heat network water outlet 44 is communicated with a pipeline P30 for primary network water supply through a pipeline P28, a pipeline P30 is communicated with a hot water type absorption heat pump generator inlet 65 through a pipeline P31, a hot water type absorption heat pump generator outlet 66 is communicated with a first heat exchanger primary network water inlet 73 through a pipeline P32, a first heat exchanger network water outlet 74 is communicated with a second heat exchanger water inlet 84 through a pipeline P33, a second heat network water outlet is connected to a pipeline P34, the pipe P11 is provided with a second circulating water pump 11; the inlet 33 of the steam type absorption heat pump evaporator is communicated with the joint of the pipeline P19 and the pipeline P22 through a pipeline P20, and the outlet 34 of the steam type absorption heat pump evaporator is communicated with the joint of the pipeline P11 and the pipeline P12 through a pipeline P21.

A pipeline P35 for secondary network backwater is communicated with an electric compression heat pump condenser inlet 51 through a pipeline P36, an electric compression heat pump condenser outlet 52 is communicated with a hot water type absorption heat pump absorber inlet 61 through a pipeline P37 and a pipeline P38, a hot water type absorption heat pump condenser outlet 62 is communicated with a first heat exchanger secondary network water inlet 71 through a pipeline P39, and a first heat exchanger secondary network water outlet 72 is communicated with a pipeline P40 for secondary network water supply.

The pipeline P11, the pipeline P13, the pipeline P16, the pipeline P20, the pipeline P21, the pipeline P23, the pipeline P24, the pipeline P27, the pipeline P28, the pipeline P30, the pipeline P31, the pipeline P34, the pipeline P35 and the pipeline P38 are respectively provided with a valve V5, a valve V6, a valve V7, a valve V10, a valve V11, a valve V12, a valve V13, a valve V15, a valve V16, a valve V18, a valve V19, a valve V20, a valve V21 and a valve V22.

The working process of the winter heat supply network water system is as follows: the primary network backwater flows into a power plant through a pipeline P11, the cooling backwater generated at the outlet 34 of the steam type absorption heat pump evaporator in the power plant flows together to a pipeline P12 through a pipeline P21 and the primary network backwater in a pipeline P11, a valve V6 is opened, the cooling backwater flows into a condenser heat network water inlet 23 through a pipeline P13 and a pipeline P14, a valve V7 is opened, the cooling backwater flows into a pipeline P19 through a pipeline P15 and a pipeline P16, and the tail end of the pipeline P19 is divided into two paths: one path flows into the inlet 33 of the evaporator of the steam type absorption heat pump along a pipeline P20 by opening a valve V10, and after heat exchange, the valve V11 is opened and returns to the power plant along a pipeline P21; and the other path of the heat exchange water flows into an inlet 35 of a steam type absorption heat pump absorber by opening a valve V12 through a pipeline P22 and a pipeline P23, the valve V13 is opened after heat exchange, the heat exchange water flows out of an outlet 36 of the steam type absorption heat pump condenser to a pipeline P24, a valve V15 is opened, the heat exchange water continuously enters a heat supply network water inlet 43 of a third heat exchanger along a pipeline P26 and a pipeline P27, the valve V16 is opened after heat exchange, and the heat exchange water flows into a heat station along a pipeline P28 and a pipeline P30.

In the thermal station, a valve V18 and a valve V19 are opened, the hot water type absorption heat pump generator enters an inlet 65 of a hot water type absorption heat pump generator along a pipeline P31, then enters a primary network water inlet 73 of a first heat exchanger through a pipeline P32, enters a heat network water inlet 84 of a second heat exchanger through a pipeline P33 after heat exchange, and flows into a pipeline P11 through opening a valve V20, a valve V5 and a second circulating water pump 11 after heat exchange and temperature reduction through a pipeline P34. And after secondary network backwater flows into the thermal power station through a backwater pipeline P35, a valve V21 is opened, the secondary network backwater flows into an inlet 51 of an electric compression type heat pump condenser through a pipeline P36, the valve V22 is opened after heat exchange, the secondary network backwater flows into an inlet 61 of a hot water type absorption heat pump absorber through a pipeline P37 and a pipeline P38, then the secondary network backwater flows into a secondary network water inlet 71 of a first heat exchanger through a pipeline P39, the secondary network backwater is continuously heated to form secondary network water, and the secondary network water is supplied.

For the soil circulating water system, the soil heat exchanger outlet 92 is communicated with the second heat exchanger circulating water side inlet 81 through a pipeline P41, a pipeline P42 and a pipeline P43, the second heat exchanger circulating water side outlet 82 is communicated with the hot water type absorption heat pump evaporator inlet 64 through a pipeline P44, the hot water type absorption heat pump evaporator outlet 63 is communicated with the electric compression type heat pump evaporator inlet 54 through a pipeline P45 and a pipeline P46, and the electric compression type heat pump evaporator outlet 53 is communicated with the soil heat exchanger inlet 91 through a pipeline P47, a pipeline P48 and a pipeline P49; wherein the pipeline P41, the pipeline P43, the pipeline P45, the pipeline P47, the pipeline P48 and the pipeline P49 are respectively provided with a valve V23, a valve V24, a valve V25, a valve V26, a valve V27 and a valve V28; the pipeline P49 is provided with a first circulating water pump 10 for supplying power to a circulating water system.

The working process of the winter soil circulating water system is as follows:

circulating water flows out from an outlet 92 of the soil heat exchanger after exchanging heat in the soil heat exchanger 9, a valve V23 and a valve V24 flow into a circulating water side inlet 81 of the second heat exchanger through a pipeline P41, a pipeline P42 and a pipeline P43, flow into an inlet 64 of a hot water type absorption heat pump evaporator through a pipeline P44 after temperature rise, open a valve V25 after exchanging heat, so that the circulating water flows into an inlet 54 of an electric compression type heat pump evaporator through a pipeline P45 and a pipeline P46, open a valve V26, a valve V27, a valve V28 and a first circulating water pump 10 after heat exchange is finished, and return to the soil heat exchanger 9 along a pipeline P47, a pipeline P48 and a pipeline P49.

In general, the function of the motor-driven compression heat pump 5 is to extract heat from the soil for heating the secondary network. The circulating water is subjected to heat exchange in the soil heat exchanger 9, enters the second heat exchanger 8 for preheating, enters the hot water type absorption heat pump 6 and the electric compression heat pump 5 in sequence after the temperature is increased for heat release, and returns to the soil heat exchanger 9 through the first circulating water pump 10 after the heat release is finished.

(2) Under the summer heat storage working condition, the system further comprises a pipeline P25, a pipeline P29, a pipeline P50, a pipeline P51, a pipeline P52, a pipeline P53, a pipeline P54 and a pipeline P55.

For a water system with heat supply network water and soil circulating water, the pipeline P11 for primary network backwater is communicated with the condenser heat supply network water inlet 23 through a pipeline P12, a pipeline P13 and a pipeline P14, the condenser heat supply network water outlet 24 is communicated with the pipeline P50 through a pipeline P15, a pipeline P16, a pipeline P19, a pipeline P22, a pipeline P25, a pipeline P26, a pipeline P29 and a pipeline P30, and the pipeline P50 is divided into two parts: one path is communicated with an inlet 51 of the electric compression heat pump condenser through the pipeline P51 and the pipeline P36, and an outlet 52 of the electric compression heat pump condenser is communicated with an inlet 91 of the soil heat exchanger through a pipeline P37, a pipeline P52 and a pipeline P49; the other path is communicated with an outlet 53 of the electric compression type heat pump evaporator through a pipeline P53 and a pipeline P47, an inlet 54 of the electric compression type heat pump evaporator is sequentially communicated with a pipeline P46 and a pipeline P54, the pipeline P54 and the pipeline P41 are communicated with a pipeline P42 together, and the pipeline P42 is communicated with a pipeline P11 through a pipeline P55.

The pipeline P25, the pipeline P29, the pipeline P50, the pipeline P51, the pipeline P52, the pipeline P53, the pipeline P54 and the pipeline P55 are respectively provided with a valve V14, a valve V17, a valve V29, a valve V30, a valve V31, a valve V32, a valve V33 and a valve V34.

Working process of the summer steam system: the exhaust steam generated by the steam turbine 1 is communicated to the exhaust steam inlet 21 of the condenser through a pipeline P8 and a pipeline P9, and the exhaust steam condensate outlet 22 of the condenser returns to the original condensate system of the power plant through a pipeline P10.

Working process of the summer heat supply network water and soil circulating water system: the low-temperature heat supply network backwater enters a power plant through a pipeline P11 for primary network backwater, after flowing into a pipeline P12 in the power plant, a valve V6 is opened, the low-temperature heat supply network backwater continuously flows into a condenser heat supply network water inlet 23 through a pipeline P13 and a pipeline P14, a valve V7 is opened after heat exchange, the low-temperature heat supply network backwater flows into a heat supply network pipeline P19 along a pipeline P15 and a pipeline P16, a valve V14 and a valve V17 are opened, and the low-temperature heat supply network backwater flows into a thermal power station along a pipeline P22, a pipeline P25, a pipeline P26. In the heating station, a valve V18 and a valve V29 are opened, and the heat supply network water is divided into two paths after flowing through a pipeline P50: one path of the heat exchange water flows into an inlet 51 of the electric compression heat pump condenser through a valve V30 and a pipeline P51 and a pipeline P36, the valve V31, the valve V28 and the first circulating water pump 10 are opened after heat exchange, the heat exchange water flows into the soil heat exchanger 9 through a pipeline P37, a pipeline P52 and a pipeline P49, the valve V23 is opened after heat exchange, and the heat exchange water flows out along a pipeline P41; and the other path of the heat exchange water enters an outlet 53 of the electric compression type heat pump evaporator along a pipeline P53 and a pipeline P47 by opening a valve V32 and a valve V26, and opens the valve V33 after heat exchange, so that the heat supply network water flows out of the evaporator to a pipeline P46 and a pipeline P54. The pipeline P54 is merged with the heat supply network water in the pipeline P41 and flows into the pipeline P42, and after the valve V34, the valve V5 and the second circulating water pump 11 are opened, the water flows into the heat supply network pipeline P11 through the pipeline P55.

In general, the function of the electric compression heat pump 5 is to store the waste heat of the exhaust steam in summer in the soil. The return water of the heat supply network is heated by the condenser 2 and flows into the heating station along with the heat supply network, and the heating station is divided into two paths: one path flows into an inlet 51 of the condenser of the electric compression heat pump, is heated, and then flows into the soil heat exchanger 9 for heat exchange; the other path flows into an outlet 53 of the electric compression type heat pump evaporator to be cooled, and the two paths are finally converged and return to the power plant through a heat supply network.

It will be understood by those skilled in the art that the motor-driven compression type heat pump evaporator outlet 53 and the motor-driven compression type heat pump evaporator inlet 54 are common to each other, and that in the operation of the heat supply network water and soil circulating water system in summer, the motor-driven compression type heat pump evaporator outlet 53 becomes an inlet of the actual water flow, and the motor-driven compression type heat pump evaporator inlet 54 becomes an outlet of the actual water flow.

In this embodiment, the pipeline P14 and the pipeline P15 are respectively communicated to the cooling tower through a pipeline P18 and a pipeline P17, the pipeline P17 and the pipeline P18 are respectively provided with a valve V8 and a valve V9, and the heat dissipation capacity of the cooling tower is controlled by adjusting the opening degrees of the valve V8 and the valve V9.

Example two

The present embodiment is directed to a heating system in which the steam turbine 1 is a direct air cooling unit.

As shown in FIG. 2, the difference between the present embodiment and the first embodiment is that the connection form of the steam exhaust cold end is different: in the embodiment, a waste steam pipeline P17 is arranged on a waste steam inlet pipe of the condenser 2 to introduce the heat of the air cooling island, a control valve V8 is arranged on the waste steam pipeline P17, and the opening of the valve V8 is adjusted to adjust the heat dissipation capacity of the air cooling island. Specifically, a pipeline P17 is connected to the pipeline P9, the end of the pipeline P17 is connected to the air cooling island, and a valve V8 is provided on the pipeline P17. The rest of the structure of this embodiment is identical to that of the first embodiment, and will not be described herein again.

EXAMPLE III

This embodiment is directed to a system with lower heating parameters for the secondary network in winter (e.g. floor radiant heating).

As shown in fig. 3, the difference between the present embodiment and the first embodiment is that, because the heating parameters of the secondary network in winter are relatively low, the thermoelectric dual-drive unit only retains the hot water type absorption heat pump 6 module, and does not use the electric compression type heat pump 5 module, and the specific connection manner is as follows: a pipeline P56, a pipeline P57, a valve V35, a valve V36, a valve V37 and a valve V38 are additionally arranged; two ends of the pipeline P56 are respectively communicated with the pipeline P35 and the pipeline P38, two ends of the pipeline P57 are respectively communicated with the outlet 63 of the hot water type absorption heat pump evaporator and the pipeline P49, and a water outlet of the pipeline P57 is positioned between the valve V27 and the first circulating water pump 10. A valve V35 is arranged on the pipeline P56, a valve V36 is arranged on the pipeline P36 and is positioned at the downstream of the water inlet of the pipeline P56, and a valve V37 is arranged on the pipeline P37 and is positioned at the upstream of the water outlet of the pipeline P56; a valve V38 is provided on the pipe P57. The rest of the structure is identical to the first embodiment.

Under the working condition of winter heat supply: the steam system is not changed, the connection of the primary net side of the heat supply network water system is not changed, and the secondary net side is changed as follows: the secondary net backwater flows to the inlet 61 of the hot water type absorption heat pump absorber through a pipeline P35, a pipeline P56 and a pipeline P38.

The soil circulating water system and the pipeline connection mode are changed as follows: circulating water directly flows from the outlet 63 of the hot water type absorption heat pump evaporator to the inlet 91 of the soil heat exchanger through a pipeline P57 and a pipeline P49.

The operation mode of the system under the summer heat storage working condition is completely the same as that of the first embodiment.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (7)

1. The utility model provides an utilize soil to stride season and hold thermoelectricity double-drive heat pump system of getting electric power plant winter and summer waste heat which characterized in that: the system comprises a steam turbine (1) for providing extraction steam and exhaust steam, a condenser (2) for recovering the waste heat of the exhaust steam, a steam type absorption heat pump (3) for heating a primary network, a third heat exchanger (4) for heat exchange between the extraction steam and the primary network, an electric compression heat pump (5), a hot water type absorption heat pump (6), a first heat exchanger (7) for heat exchange of a secondary heat network, a second heat exchanger (8) for heat exchange between heat network water and circulating water, and a soil heat exchanger (9) for heat exchange with soil;

the condenser (2) comprises a condenser exhaust steam inlet (21), a condenser exhaust steam condensate outlet (22), a condenser heat supply network water inlet (23) and a condenser heat supply network water outlet (24);

the steam type absorption heat pump (3) comprises a steam type absorption heat pump generator inlet (31), a steam type absorption heat pump generator outlet (32), a steam type absorption heat pump evaporator inlet (33), a steam type absorption heat pump evaporator outlet (34), a steam type absorption heat pump absorber inlet (35) and a steam type absorption heat pump condenser outlet (36);

the third heat exchanger (4) comprises a third heat exchanger steam extraction inlet (41), a third heat exchanger steam extraction condensed water outlet (42), a third heat exchanger heat supply network water inlet (43) and a third heat exchanger heat supply network water outlet (44);

the electric compression type heat pump (5) comprises an electric compression type heat pump condenser inlet (51), an electric compression type heat pump condenser outlet (52), an electric compression type heat pump evaporator outlet (53) and an electric compression type heat pump evaporator inlet (54);

the hot water type absorption heat pump (6) comprises a hot water type absorption heat pump absorber inlet (61), a hot water type absorption heat pump condenser outlet (62), a hot water type absorption heat pump evaporator outlet (63), a hot water type absorption heat pump evaporator inlet (64), a hot water type absorption heat pump generator inlet (65) and a hot water type absorption heat pump generator outlet (66);

the first heat exchanger (7) comprises a first heat exchanger secondary net water inlet (71), a first heat exchanger secondary net water outlet (72), a first heat exchanger primary net water inlet (73) and a first heat exchanger primary net water outlet (74);

the second heat exchanger (8) comprises a second heat exchanger circulating water side inlet (81), a second heat exchanger circulating water side outlet (82), a second heat exchanger heat supply network water outlet (83) and a second heat exchanger heat supply network water inlet (84);

the soil heat exchanger (9) comprises a soil heat exchanger inlet (91) and a soil heat exchanger outlet (92);

under the working condition of heat supply in winter, for a steam system, extraction steam generated by the steam turbine (1) is divided into two paths through a pipeline P1 and a pipeline P3: one path of extracted steam is communicated with an inlet (31) of the steam type absorption heat pump generator through a pipeline P4, and an outlet (32) of the steam type absorption heat pump generator returns to an original condensate system of the power plant through a pipeline P5; the other path of extracted steam is communicated with the extracted steam inlet (41) of the third heat exchanger through a pipeline P6, and the extracted steam condensate outlet (42) of the third heat exchanger returns to the original condensate system of the power plant through a pipeline P7; wherein the pipeline P3, the pipeline P4 and the pipeline P6 are respectively provided with a valve V1, a valve V3 and a valve V4; the exhaust steam generated by the steam turbine (1) is communicated to the exhaust steam inlet (21) of the condenser through a pipeline P8 and a pipeline P9, and the exhaust steam condensate outlet (22) of the condenser returns to the original exhaust steam condensate system of the power plant through a pipeline P10;

for a heat network water system, a pipeline P11 for primary network backwater is communicated with the condenser heat network water inlet (23) through a pipeline P12, a pipeline P13 and a pipeline P14, the condenser heat network water outlet (24) is communicated with the steam-type absorption heat pump absorber inlet (35) through a pipeline P15, a pipeline P16, a pipeline P19, a pipeline P22 and a pipeline P23, the steam-type absorption heat pump condenser outlet (36) is communicated with the third heat exchanger heat network water inlet (43) through a pipeline P24, a pipeline P26 and a pipeline P27, the third heat exchanger heat network water outlet (44) is communicated with a pipeline P30 for primary network water supply through a pipeline P28, the pipeline P30 is communicated with the hot water-type absorption heat pump generator inlet (65) through a pipeline P31, the hot water-type heat pump generator outlet (66) is communicated with the first absorption heat exchanger primary network water inlet (73) through a pipeline P32, the first heat exchanger primary grid water outlet (74) is communicated with the second heat exchanger grid water inlet (84) through a pipeline P33, the second heat exchanger grid water outlet (83) is connected to the pipeline P11 through a pipeline P34, and the pipeline P11 is provided with a second circulating water pump (11); the inlet (33) of the steam-type absorption heat pump evaporator is communicated with the joint of the pipeline P19 and the pipeline P22 through a pipeline P20, and the outlet (34) of the steam-type absorption heat pump evaporator is communicated with the joint of the pipeline P11 and the pipeline P12 through a pipeline P21;

a pipeline P35 for secondary network backwater is communicated with the electric compression heat pump condenser inlet (51) through a pipeline P36, the electric compression heat pump condenser outlet (52) is communicated with the hot water type absorption heat pump absorber inlet (61) through a pipeline P37 and a pipeline P38, the hot water type absorption heat pump condenser outlet (62) is communicated with the first heat exchanger secondary network water inlet (71) through a pipeline P39, and the first heat exchanger secondary network water outlet (72) is communicated with a pipeline P40 for secondary network water supply;

wherein the pipeline P11, the pipeline P13, the pipeline P16, the pipeline P20, the pipeline P21, the pipeline P23, the pipeline P24, the pipeline P27, the pipeline P28, the pipeline P30, the pipeline P31, the pipeline P34, the pipeline P35 and the pipeline P38 are respectively provided with a valve V5, a valve V6, a valve V7, a valve V10, a valve V11, a valve V12, a valve V13, a valve V15, a valve V16, a valve V18, a valve V19, a valve V20, a valve V21 and a valve V22;

for a soil circulating water system, the soil heat exchanger outlet (92) is communicated with the second heat exchanger circulating water side inlet (81) through a pipeline P41, a pipeline P42 and a pipeline P43, the second heat exchanger circulating water side outlet (82) is communicated with the hot water type absorption heat pump evaporator inlet (64) through a pipeline P44, the hot water type absorption heat pump evaporator outlet (63) is communicated with the electric compression type heat pump evaporator inlet (54) through a pipeline P45 and a pipeline P46, and the electric compression type heat pump evaporator outlet (53) is communicated with the soil heat exchanger inlet (91) through a pipeline P47, a pipeline P48 and a pipeline P49; wherein the pipeline P41, the pipeline P43, the pipeline P45, the pipeline P47, the pipeline P48 and the pipeline P49 are respectively provided with a valve V23, a valve V24, a valve V25, a valve V26, a valve V27 and a valve V28; a first circulating water pump (10) for providing power for a circulating water system is arranged on the pipeline P49;

under the summer heat storage working condition, the system further comprises a pipeline P25, a pipeline P29, a pipeline P50, a pipeline P51, a pipeline P52, a pipeline P53, a pipeline P54 and a pipeline P55;

for a heat supply network water and soil circulating water system, the pipeline P11 for primary network backwater is communicated with the condenser heat supply network water inlet (23) through the pipeline P12, the pipeline P13 and the pipeline P14, the condenser heat supply network water outlet (24) is communicated with the pipeline P50 through the pipeline P15, the pipeline P16, the pipeline P19, the pipeline P22, the pipeline P25, the pipeline P26, the pipeline P29 and the pipeline P30, and the pipeline P50 is divided into two paths: one path is communicated with the inlet (51) of the electric compression heat pump condenser through the pipeline P51 and the pipeline P36, and the outlet (52) of the electric compression heat pump condenser is communicated with the inlet (91) of the soil heat exchanger through the pipeline P37, the pipeline P52 and the pipeline P49; the other path is communicated with the outlet (53) of the electric compression type heat pump evaporator through the pipeline P53 and a pipeline P47, the inlet (54) of the electric compression type heat pump evaporator is communicated with the pipeline P46 and a pipeline P54 in sequence, the pipeline P54 and the pipeline P41 are communicated with the pipeline P42 together, and the pipeline P42 is communicated with the pipeline P11 through the pipeline P55;

the pipeline P25, the pipeline P29, the pipeline P50, the pipeline P51, the pipeline P52, the pipeline P53, the pipeline P54 and the pipeline P55 are respectively provided with a valve V14, a valve V17, a valve V29, a valve V30, a valve V31, a valve V32, a valve V33 and a valve V34.

2. The thermoelectric double-drive heat pump system utilizing the soil to store the residual heat of the power plant in winter and summer in different seasons according to claim 1, characterized in that: the pipeline P14 and the pipeline P15 are respectively communicated to the cooling tower through a pipeline P18 and a pipeline P17, the pipeline P17 and the pipeline P18 are respectively provided with a valve V8 and a valve V9, and the heat dissipation capacity of the cooling tower is controlled by adjusting the opening degrees of the valve V8 and the valve V9.

3. The thermoelectric double-drive heat pump system utilizing the soil to store the residual heat of the power plant in winter and summer in different seasons according to claim 1, characterized in that: the pipeline P9 is communicated with a pipeline P17, the tail end of the pipeline P17 is communicated with the air cooling island, the pipeline P17 is provided with a valve V8, and the heat dissipation capacity of the air cooling island is controlled by adjusting the opening degree of the valve V8.

4. The thermoelectric double-drive heat pump system utilizing the soil to store the residual heat of the power plant in winter and summer in different seasons according to claim 1, characterized in that: the steam turbine (1) can be one group, two groups or multiple groups, and can be a wet cooling unit, an indirect air cooling unit or a direct air cooling unit.

5. The thermoelectric double-drive heat pump system utilizing the soil to store the residual heat of the power plant in winter and summer in different seasons according to claim 1, characterized in that: the soil heat exchanger (9) adopts a multi-pipe series connection or parallel connection mode.

6. The thermoelectric double-drive heat pump system utilizing the soil to store the residual heat of the power plant in winter and summer in different seasons according to claim 5, characterized in that: the soil heat exchanger (9) is made of a U-shaped pipe or a spiral pipe.

7. The thermoelectric double-drive heat pump system utilizing the residual heat of the soil cross-season power storage plant in winter and summer according to any one of claims 1 to 6, characterized in that: comprises a pipeline P56, a pipeline P57, a valve V35, a valve V36, a valve V37 and a valve V38; two ends of the pipeline P56 are respectively communicated with the pipeline P35 and the pipeline P38, two ends of the pipeline P57 are respectively communicated with the outlet 63 of the hot water type absorption heat pump evaporator and the pipeline P49, and a water outlet of the pipeline P57 is positioned between the valve V27 and the first circulating water pump (10);

the valve V35 is arranged on the pipeline P56, the valve V36 is arranged on the pipeline P36 and is positioned at the downstream of the water inlet of the pipeline P56, and the valve V37 is arranged on the pipeline P37 and is positioned at the upstream of the water outlet of the pipeline P56; the valve V38 is arranged on the pipeline P57.

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