Zero-carbon capacity increasing system of urban central heating pipe network

Abstract

The utility model provides a zero-carbon capacity increasing system for an urban centralized heat supply pipe network, which comprises a controller, a heat exchange initial station, a first network heat supply circulating pipeline, a second-stage station, a first and second network heat supply circulating pipeline, a heat taking system, a geothermal heat compensation system, a reclaimed water heat compensation system and a second and second network heat supply circulating pipeline, the first heat exchange station is used for achieving circulating heat exchange between high-temperature steam and the first-network heat supply circulating pipeline, the second-level station is used for achieving circulating heat exchange between the first-network heat supply circulating pipeline and the first second-network heat supply circulating pipeline, and the heat taking system can achieve circulating heat exchange between the second second-network heat supply circulating pipeline and the first-network heat supply circulating pipeline. The geothermal heat compensation system and the reclaimed water heat compensation system can heat return water of the first-network heat supply circulation pipeline. According to the system, a geothermal source and a sewage heat source are combined to achieve heating of first-network return water, and therefore the heat supply capacity of an old pipe network is improved under the condition that the heat supply load of an original coal-fired unit is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-energy complementary clean heating and zero-carbon heating, and specifically to a zero-carbon capacity expansion system for a city's centralized heating pipe network. Background Art

[0002] Currently, urban centralized heating faces problems such as "insufficient heating load of old coal-fired units", "difficulty in approving the construction of new coal-fired units", and insufficient heating capacity of old pipelines in urban areas.

[0003] To address the insufficient heating capacity of aging urban pipeline networks, a wide temperature difference heating technology is currently being adopted. This involves using absorption heat pumps to recover excess heat from primary return water, further reducing the return water temperature, widening the supply and return water temperature difference, and improving the heating capacity of the existing pipeline network. While lowering the primary return water temperature can reduce heat losses along the pipeline network to a certain extent, it still increases steam consumption at the initial heat exchange station, ultimately requiring an increase in the heating load of coal-fired units. This is unsuitable for coal-fired units in urban areas where the heating load is severely insufficient.

[0004] In order to solve the problem of insufficient heating load of old coal-fired units in urban areas, distributed clean heating technologies such as air source heat pumps, sewage source heat pumps, and ground source heat pumps are currently used. The above heating methods are mostly single heat sources, with poor heating stability and low waste heat utilization efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a zero-carbon capacity expansion system for urban centralized heating pipelines. The system can use large temperature difference technology to achieve auxiliary heating of the return water of the second network. At the same time, it uses geothermal sources and sewage heat sources to jointly achieve heating of the return water of the first network, thereby improving the heating capacity of the old pipeline network without increasing the heating load of the original coal-fired units.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a zero-carbon capacity expansion system for urban centralized heating pipelines, including a controller, a heat exchanger station, a first network heating circulation pipeline, a secondary station, a first and a second network heating circulation pipeline, a heat extraction system, a geothermal heat supplement system, a reclaimed water heat supplement system, and a second and a second network heating circulation pipeline. The heat exchanger station is used to realize the circulating heat exchange between high-temperature steam and the first network heating circulation pipeline, the secondary station is used to realize the circulating heat exchange between the first network heating circulation pipeline and the first and the second network heating circulation pipeline, the heat extraction system can realize the circulating heat exchange between the second and the second network heating circulation pipeline and the first network heating circulation pipeline, and the geothermal heat supplement system and the reclaimed water heat supplement system can both realize the heating of the return water of the first network heating circulation pipeline.

[0007] Preferably, the single-network heat supply circulation pipeline includes a single-network water supply pipeline and a single-network return water pipeline, the single-network water supply pipeline and the single-network return water pipeline realize the circulation connection between the heat exchange primary station and the secondary station, a first water pump is arranged on the single-network return water pipeline, the heat extraction system includes a three-channel heat exchange unit, the three-channel heat exchange unit includes a compressor, a condenser, and an evaporator, the compressor, condenser and evaporator are connected in a closed loop through a media pipeline, the heat absorption side of the evaporator is connected in a closed loop with the single-network return water pipeline through a first pipeline and a second pipeline, a first electric control valve is arranged on the single-network return water pipeline, and the first electric control valve is connected in a closed loop with the heat absorption side of the evaporator through a first pipeline and a second pipeline, and a first electric control valve is arranged on the single-network return water pipeline, and the first electric control valve is connected in a closed loop with the heat absorption side of the evaporator. The control valve is located between the connection between the first pipe and the second pipe and the first network return pipe; the second second network heating circulation pipeline includes a second second network water supply pipe and a second second network return pipe, and the heat release side of the condenser is connected with the second second network water supply pipe and the second second network return pipe. A first three-way electric control valve and a second three-way electric control valve are respectively connected in series on the second second network water supply pipe and the second second network return pipe. One port of the first three-way electric control valve is connected with the outlet end of the heat release side of the evaporator through a third pipe, and one port of the second three-way electric control valve is connected with the inlet end of the heat release side of the evaporator through a fourth pipe.

[0008] Furthermore, a third three-way electrically controlled valve is provided on the second pipeline, and a bypass pipeline is provided between the third three-way electrically controlled valve and the first pipeline.

[0009] Furthermore, the geothermal heat supplement system includes a solar collector, an inter-seasonal underground heat storage tank, and a geothermal source heat pump. The solar collector realizes circulating heat exchange with the inter-seasonal underground heat storage tank through a first circulation pipeline, and the inter-seasonal underground heat storage tank realizes circulating heat exchange with the geothermal source heat pump through a second circulation pipeline. The heat release side of the geothermal source heat pump is connected to the closed loop of the single-network return pipe through a ninth pipe and a tenth pipe. A second electrically controlled valve is arranged on the single-network return pipe, and the second electrically controlled valve is located between the ninth pipe, the tenth pipe and the connection point of the single-network return pipe.

[0010] Furthermore, the grey water heat replenishment system includes a grey water delivery pipeline, a water reservoir, a third circulation pipeline, and a sewage source heat pump. The grey water delivery pipeline can realize the delivery of grey water from the sewage treatment plant to the water reservoir. The third circulation pipeline realizes the circulating heat exchange between the water reservoir and the sewage source heat pump. The heat release side of the sewage source heat pump is connected to the closed loop of the single-network return pipe through the fourteenth pipe and the fifteenth pipe. A third electrically controlled valve is arranged on the single-network return pipe, and the third electrically controlled valve is located between the connection between the fourteenth pipe and the fifteenth pipe and the single-network return pipe.

[0011] Furthermore, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor and a fifth temperature sensor are respectively provided on the first pipeline, the ninth pipeline, the tenth pipeline, the fourteenth pipeline and the fifteenth pipeline.

[0012] The beneficial effects of the utility model are:

[0013] (1) Zero carbon increases heating capacity

[0014] The secondary station connected to the return water pipeline of the first network uses a high-efficiency three-channel heat exchanger unit based on the principle of large temperature difference technology, which can effectively solve the problem of insufficient heating load of old coal-fired units in urban areas and increase the heating area.

[0015] After taking heat from the secondary station, the return water of the first network is replenished with heat by the subsequent solar-geothermal heat replenishment subsystem and the reclaimed water waste heat replenishment subsystem, and the water temperature is raised to the original return water temperature, ensuring that the steam consumption of the first heat exchange station or the boiler heating load is not increased or reduced.

[0016] (2) Effectively solve the problem of poor stability of distributed clean energy single heat source heating system

[0017] The distributed clean energy single heat source heating system is changed from directly supplying heat to the user side to providing heat supplement to the city's centralized heating return network. The heat supplement source is changed from a single heat source to a heat source complementary form, making the heating on the user side more stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a system flow chart of the utility model;

[0020] In the figure: 1 heat exchange station, 11 first network water supply pipeline, 12 first network return pipeline, 2 second-level station, 21 first and second network water supply pipeline, 22 first and second network return pipeline, 31 second and second network water supply pipeline, 32 second and second network return pipeline, 41 compressor, 42 condenser, 43 evaporator, 44 medium pipeline, 51 solar collector, 52 cross-season underground heat storage tank, 53 geothermal source heat pump, 61 water storage tank, 62 sewage source heat pump, 101 first pipeline, 102 second pipeline, 103 third pipeline, 104 fourth pipeline, 105 fifth pipeline, 106 sixth pipeline, 107 seventh pipeline, 108 eighth pipeline, 109 The ninth pipeline, 110 the tenth pipeline, 111 the eleventh pipeline, 112 the twelfth pipeline, 113 the thirteenth pipeline, 114 the fourteenth pipeline, 115 the fifteenth pipeline, 116 the bypass pipeline, 201 the first three-way electrically controlled valve, 202 the second three-way electrically controlled valve, 203 the third three-way electrically controlled valve, 301 the first water pump, 302 the second water pump, 303 the third water pump, 304 the fourth water pump, 401 the first electrically controlled valve, 402 the second electrically controlled valve, 403 the third electrically controlled valve, 501 the first temperature sensor, 502 the second temperature sensor, 503 the third temperature sensor, 504 the fourth temperature sensor, 505 the fifth temperature sensor. DETAILED DESCRIPTION

[0021] The following will be combined with specific embodiments and appendix Figure 1 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only some preferred embodiments of the present invention, not all embodiments. Those skilled in the art may make similar modifications without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] The utility model provides a zero-carbon capacity expansion system for urban centralized heating pipe networks (such as Figure 1As shown), it includes a controller, a heat exchange station 1, a network heating circulation pipeline, a secondary station 2, a first and a second network heating circulation pipeline, a heat extraction system, a geothermal heat supplement system, a reclaimed water heat supplement system, and a second and a second network heating circulation pipeline. The controller is a PLC controller. The main function of the heat exchange station 1 is to provide thermal energy. The secondary station 2 is used to realize heat transfer between the primary network and the secondary network. The heat exchange station 1 is used to realize the circulating heat exchange between high-temperature steam and the network heating circulation pipeline. The secondary station 2 is used to realize the circulating heat exchange between the network heating circulation pipeline and the first and second network heating circulation pipeline. The first and second network heating circulation pipeline is used to supply heat to the user side. The first and second network heating circulation pipeline includes a first and a second network water supply pipeline 21 and a first and a second network return water pipeline 22. The heat extraction system can realize the second The circulating heat exchange between the second network heating circulation pipeline and the first network heating circulation pipeline is also used to supply heat to the user side. The geothermal heating system and the reclaimed water heating system can both realize the heating of the return water of the first network heating circulation pipeline. The heat extraction system uses the large temperature difference principle to use the waste heat of the return water in the first network heating circulation pipeline as a heat source to continue to extract heat energy. The extracted heat energy is directly used for heating on the user side, thereby increasing the heating load of the first network heating circulation pipeline. The geothermal heating system and the reclaimed water heating system heat the return water in the first network heating circulation pipeline after large temperature difference heat extraction, ensuring that the steam consumption of the first heat exchange station or the boiler heating load is not increased or reduced. At the same time, the heat source is jointly heated by the geothermal heating system and the reclaimed water heating system, and the heating on the user side is more stable and efficient.

[0023] On the basis of the above embodiments, the heat extraction system utilizes the large temperature difference heat extraction principle to realize the specific implementation method of returning water in a network heat supply circulation pipeline to extract heat again: the network heat supply circulation pipeline includes a network water supply pipeline 11 and a network return water pipeline 12. The network water supply pipeline 11 and the network return water pipeline 12 realize the circulating connection between the heat exchange first station 1 and the secondary station 2. In actual application, high-temperature steam is transported to the heat exchange first station 1 through a pipeline. The condensed water generated after the high-temperature steam releases heat and condenses in the heat exchange first station 1 flows out of the heat exchange first station 1 through a pipeline. The circulation flow of high-temperature steam in the heat exchange first station 1 is utilized to realize the continuous supply of heat energy to the heat exchange first station 1. A first water pump 301 is provided on the channel 12. The heat extraction system includes a three-channel heat exchange unit, which includes a compressor 41, a condenser 42, and an evaporator 43. The compressor 41, the condenser 42, and the evaporator 43 are connected in a closed loop through a medium pipe 44. The heat transfer medium in the medium pipe 44 circulates between the condenser 42 and the evaporator 43 under the action of the compressor 41, thereby facilitating heat transfer according to demand. The heat absorption side of the evaporator 43 is connected in a closed loop with the return water pipe 12 of the network through the first pipe 101 and the second pipe 102, that is, the return water in the return water pipe 12 of the network is connected by the first water pump 301. After being transported, it enters the first pipe 101, flows out of the evaporator 43, and then flows into the first network return water pipe 12 through the second pipe 102. The first network return water releases heat in the evaporator 43. A first electrically controlled valve 401 is set on the first network return water pipe 12, and the first electrically controlled valve 401 is located between the first pipe 101 and the second pipe 102 and the first network return water pipe 12. When the heating system is working, the first electrically controlled valve 401 is in a closed state, so that the first network return water can smoothly enter the evaporator 43. When the heating system is not working, the first electrically controlled valve 401 is in an open state; the second second network heating circulation pipeline includes a second The second network water supply pipe 32, the second second network return pipe 31, the heat release side of the condenser 42 is connected with the second second network water supply pipe 32 and the second second network return pipe 31, and the condenser 42 is used to realize the heat absorption of the second second network heating circulation pipeline. A first three-way electric control valve 201 and a second three-way electric control valve 202 are respectively connected in series on the second second network water supply pipe 32 and the second second network return pipe 31. One port of the first three-way electric control valve 201 is connected with the outlet end of the heat release side of the evaporator 43 through the third pipe 103, and one port of the second three-way electric control valve 202 is connected with the inlet end of the heat release side of the evaporator 43 through the fourth pipe 104.In actual application, the controller is electrically connected to the first three-way electric control valve 201, the second electric control valve 202 and the compressor 41. The controller controls the operation of the first three-way electric control valve 201, the second electric control valve 202 and the compressor 41 according to actual needs. For example, when the return water temperature of the return water pipe 12 of the first network is higher than 50°C in the non-extreme cold period or the return water temperature of the return water pipe 12 of the first network is higher than 55°C in the extremely cold period, the compressor 41 does not start, the first three-way electric control valve 201 realizes the direct connection between the second second network return water pipe 32 and the third pipe 103, and the second three-way electric control valve 202 realizes the second second network return water pipe 32 and the third pipe 103. The water supply pipe 31 and the fourth pipe 104 are connected, so that the high-temperature water in the first network return pipe 12 can be directly heat-exchanged with the user-side return water through the evaporator 43; when the return water temperature of the first network return pipe 12 is lower than 50°C in the non-extreme cold period or the return water temperature of the first network return pipe is lower than 55°C in the extreme cold period, the compressor 41 is started, and the first three-way electric control valve 201 realizes the direct connection between the second second network return pipe 32 and the condenser 42, and the second three-way electric control valve 202 realizes the direct connection between the second second network water supply pipe 31 and the condenser 42, so that the user-side return water is heated and heated through the condenser 42. When the first pipe 101 and the second pipe 102 are used to circulate and provide a return water flow to the evaporator 43, in order to facilitate flow stability, a third three-way electric-controlled valve 203 is provided on the second pipe 102, and a bypass pipe 116 is provided between the third three-way electric-controlled valve 203 and the first pipe 101. During the operation of the heat extraction system, the third three-way electric-controlled valve 203 is always in an open state, thereby realizing the diversion of the first pipe 101.

[0024] On the basis of the above embodiment, the specific implementation of the geothermal heat supplement system is as follows: the geothermal heat supplement system includes a solar collector 51, an inter-seasonal underground heat storage tank 52, and a geothermal heat pump 53. The solar collector 51, the inter-seasonal underground heat storage tank 52, and the geothermal heat pump 53 are all known technical products in the art. The solar collector 51 realizes a circulating heat exchange with the inter-seasonal underground heat storage tank 52 through a first circulation pipeline. Specifically, the first circulation pipeline includes a fifth pipeline 105, a sixth pipeline 106, and a second water pump 302. The fifth pipeline 10 5 and the sixth pipeline 106 realize the closed-loop connection between the solar thermal collector 51 and the inter-seasonal underground heat storage tank 52. The second water pump 302 is arranged on the sixth pipeline 106. The second water pump 302 runs continuously all year round, so that the heat energy in the solar thermal collector 51 is continuously stored in the water source in the inter-seasonal underground heat storage tank 52. The inter-seasonal underground heat storage tank 52 realizes the circulating heat exchange with the geothermal source heat pump 53 through the second circulation pipeline. Specifically, the second circulation pipeline includes the seventh pipeline 107, the eighth pipeline 108 and the third water pump 303. The seventh pipeline 107 and the eighth pipeline 108 realize the closed-loop through-connection between the cross-season underground heat storage tank 52 and the geothermal heat pump 53. The third water pump 303 is arranged on the eighth pipeline 108. In the heating season, the continuous operation of the third water pump 303 enables the heat of the cross-season underground heat storage tank 52 to be continuously transported to the geothermal heat pump 53. The heat release side of the geothermal heat pump 53 is connected to the closed-loop through-connection of the first network return water pipeline 12 through the ninth pipeline 109 and the tenth pipeline 110. A second electric control valve 4 is arranged on the first network return water pipeline 12. 02, and the second electrically controlled valve 402 is located between the ninth and tenth pipes 109 and the connection with the primary return pipe. Return water from the primary return pipe 12 first enters the ninth pipe 109, then flows from the geothermal heat pump 53 into the tenth pipe 110, and then flows back into the primary return pipe 12. This utilizes the geothermal heat pump 53 to heat the return water in the primary return pipe 12, thus achieving the primary return water heat replenishment function. During operation of the geothermal heat pump 53, the second electrically controlled valve 402 is closed, and otherwise, it is open. The third water pump 303 and the geothermal heat pump 53 are only operated during the winter heating season.

[0025] On the basis of the above embodiments, the specific implementation method of the grey water heat replenishment system is as follows: the grey water heat replenishment system includes a grey water delivery pipeline, a water reservoir 61, a third circulation pipeline, and a sewage source heat pump 62. The grey water delivery pipeline can realize the delivery of grey water from the sewage treatment plant to the water reservoir 61. Specifically, the grey water delivery pipeline includes an eleventh pipeline 111 and a fourth water pump 304. The fourth water pump 304 is arranged on the eleventh pipeline 111. In the winter heating season, the controller turns on the fourth water pump 304 to realize the delivery of treated grey water discharged from the sewage treatment plant to the water reservoir 61. The third circulation pipeline realizes the circulating heat exchange between the water reservoir 61 and the sewage source heat pump 62. Specifically, the third circulation pipeline includes a twelfth pipeline 112, a thirteenth pipeline 113, and a fifth water pump 305. The twelfth pipeline 112 and the thirteenth pipeline 113 realize the closed-loop connection between the water reservoir 61 and the sewage source heat pump 62. The fifth water pump 305 is arranged on the thirteenth pipeline 113. After the controller turns on the fifth water pump 305 , the recycled water in the water reservoir 61 is continuously circulated between the water reservoir 61 and the sewage source heat pump 62, and the sewage source heat pump 62 absorbs the heat of the recycled water during operation. The heat release side of the sewage source heat pump 62 is connected to the closed loop of the first network return pipe 12 through the fourteenth pipe 114 and the fifteenth pipe 115. A third electrically controlled valve 403 is provided on the first network return pipe 12, and the third electrically controlled valve 403 is located between the fourteenth pipe 114 and the fifteenth pipe 115. At the connection between pipe 115 and the primary return pipe 12, the return water from the primary return pipe 12 first enters the fourteenth pipe 114 before flowing from the sewage-source heat pump 62 into the fifteenth pipe 115. It then flows back into the primary return pipe 12, thereby utilizing the sewage-source heat pump 62 to heat the return water in the primary return pipe 12, thus achieving the primary return water heat replenishment function. During operation of the sewage-source heat pump 62, the third electrically controlled valve 403 is closed; otherwise, it is open. The fourth and fifth water pumps 304, 305, and the sewage-source heat pump 62 operate only during the winter heating season.

[0026] Furthermore, a first temperature sensor 501, a second temperature sensor 502, a third temperature sensor 503, a fourth temperature sensor 504 and a fifth temperature sensor 505 are respectively provided on the first pipeline 101, the ninth pipeline 109, the tenth pipeline 110, the fourteenth pipeline 114 and the fifteenth pipeline 115. The first temperature sensor 501, the second temperature sensor 502, the third temperature sensor 503, the fourth temperature sensor 504 and the fifth temperature sensor 505 are all electrically connected to the controller. During operation, the above-mentioned temperature sensors transmit monitoring data to the controller in real time, thereby facilitating the controller to regulate the operation of the corresponding system according to the monitored temperature values.

[0027] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

[0028] The above description, in conjunction with the accompanying drawings, details the preferred embodiments and examples of the present invention. However, the present invention is not limited to the above embodiments and examples. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the concept of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A zero-carbon capacity expansion system for a city centralized heating network, comprising a controller, a heat exchanger station, a primary heating circulation pipeline, a secondary station, and first and second heating circulation pipelines. The heat exchanger station is used to realize cyclic heat exchange between high-temperature steam and the primary heating circulation pipeline, and the secondary station is used to realize cyclic heat exchange between the primary heating circulation pipeline and the first and second heating circulation pipelines. The system is characterized by: The zero-carbon capacity expansion system also includes a heat extraction system, a geothermal heat supplement system, a reclaimed water heat supplement system, and a second-network heating circulation pipeline. The heat extraction system can realize the circulating heat exchange between the second-network heating circulation pipeline and the first-network heating circulation pipeline. The geothermal heat supplement system and the reclaimed water heat supplement system can both realize the heating of the return water of the first-network heating circulation pipeline.

2. The zero-carbon capacity expansion system for urban centralized heating pipe networks according to claim 1 is characterized in that: The single-network heat supply circulation pipeline includes a single-network water supply pipeline and a single-network return water pipeline. The single-network water supply pipeline and the single-network return water pipeline realize the circulation connection between the first heat exchange station and the second heat exchange station. A first water pump is provided on the single-network return water pipeline. The heat extraction system includes a three-channel heat exchange unit. The three-channel heat exchange unit includes a compressor, a condenser, and an evaporator. The compressor, condenser, and evaporator are connected in a closed loop through a media pipeline. The heat absorption side of the evaporator is connected in a closed loop with the single-network return water pipeline through a first pipeline and a second pipeline. A first electric control valve is provided on the single-network return water pipeline, and the first electric control valve Located between the connection between the first pipe and the second pipe and the first network return pipe; the second second network heating circulation pipeline includes a second second network water supply pipe and a second second network return pipe, and the heat release side of the condenser is connected with the second second network water supply pipe and the second second network return pipe. A first three-way electric control valve and a second three-way electric control valve are respectively connected in series on the second second network water supply pipe and the second second network return pipe. One port of the first three-way electric control valve is connected with the outlet end of the heat release side of the evaporator through a third pipe, and one port of the second three-way electric control valve is connected with the inlet end of the heat release side of the evaporator through a fourth pipe.

3. According to the zero-carbon capacity expansion system for urban centralized heating pipe networks of claim 2, a third three-way electrically controlled valve is provided on the second pipe, and a bypass pipe is provided between the third three-way electrically controlled valve and the first pipe.

4. A zero-carbon capacity expansion system for a city centralized heating network according to claim 2, wherein the geothermal heat supplement system includes a solar collector, an inter-seasonal underground heat storage tank, and a geothermal heat pump. The solar collector realizes circulating heat exchange with the inter-seasonal underground heat storage tank through a first circulation pipeline, and the inter-seasonal underground heat storage tank realizes circulating heat exchange with the geothermal heat pump through a second circulation pipeline. The heat release side of the geothermal heat pump is connected to the closed loop of the return water pipe of the network through a ninth pipeline and a tenth pipeline. A second electrically controlled valve is provided on the return water pipe of the network, and the second electrically controlled valve is located between the connection between the ninth pipeline and the tenth pipeline and the return water pipe of the network.

5. A zero-carbon capacity expansion system for a city centralized heating network according to claim 4, wherein the reclaimed water heat replenishment system includes a reclaimed water transmission pipeline, a water reservoir, a third circulation pipeline, and a sewage source heat pump. The reclaimed water transmission pipeline can realize the transportation of reclaimed water from the sewage treatment plant to the water reservoir. The third circulation pipeline realizes cyclic heat exchange between the water reservoir and the sewage source heat pump. The heat release side of the sewage source heat pump is connected to the closed loop of the return water pipe of the first network through the fourteenth pipe and the fifteenth pipe. A third electrically controlled valve is arranged on the return water pipe of the first network, and the third electrically controlled valve is located between the connection between the fourteenth pipe and the fifteenth pipe and the return water pipe of the first network.

6. According to the zero-carbon capacity expansion system for urban centralized heating pipe networks of claim 5, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, and a fifth temperature sensor are respectively provided on the first pipe, the ninth pipe, the tenth pipe, the fourteenth pipe, and the fifteenth pipe.

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