CN219103110U - Large-temperature-difference heating system utilizing return water waste heat of town heat network - Google Patents
Large-temperature-difference heating system utilizing return water waste heat of town heat network Download PDFInfo
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- CN219103110U CN219103110U CN202223551041.9U CN202223551041U CN219103110U CN 219103110 U CN219103110 U CN 219103110U CN 202223551041 U CN202223551041 U CN 202223551041U CN 219103110 U CN219103110 U CN 219103110U
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Abstract
The utility model discloses a large-temperature-difference heat supply system utilizing return water waste heat of a town heat supply network, which comprises a heat supply source plant, a centralized heat supply primary heat supply network water supply pipe, a centralized heat supply primary heat supply network water return pipe, a waste heat recovery system, a heat user secondary heat supply network water return pipe and a heat user secondary heat supply network water supply pipe, wherein the heat user secondary heat supply network water return pipe and the heat user secondary heat supply network water supply pipe are in heat exchange connection with the centralized heat supply primary heat supply network water return pipe through the waste heat recovery system, and the centralized heat supply primary heat supply network water return pipe and the centralized heat supply primary heat supply network water supply pipe are connected with a heat supply source plant pipeline, so that the heat supply network return water waste heat recovery utilization rate is improved, and the heat supply capacity is increased.
Description
Technical Field
The utility model belongs to the technical field of central heating, and particularly relates to a large-temperature-difference heating system utilizing return water waste heat of a town heat network.
Background
In recent years, with the rapid development of urban areas, the urban scale is gradually enlarged, the centralized heating area and the heat load are also greatly increased, and the centralized heating network also faces the problem of insufficient heat supply capacity. The town central heating network generally at least comprises two-stage network, and the two-stage network exchanges heat through the heat exchange station. The primary pipe network is connected with a heat source plant, which is generally a thermal power plant or a small boiler room. Under the general condition, the water supply temperature of the primary pipe network of the urban central heating is 110-130 ℃, the return water temperature of the primary pipe network is 50-70 ℃, and the primary pipe network has the characteristics of large flow and low temperature. The heat supply network backwater belongs to low temperature waste heat, and the recovery difficulty is high.
With the trend of large-scale and complicated heating pipe networks, the problems of insufficient heat supply capacity of the tail end heat exchange station, insufficient heat supply of partial users, overheating of the near end, far-end supercooling and the like generally exist, and the maximum heat supply capacity of a heat source plant cannot reach the maximum heat supply output because the return water temperature of a power plant cannot be reduced, so that the problems of insufficient heat supply capacity of the tail end heat exchange station and the heat supply capacity of the heat source plant are urgently solved.
With the implementation of national 'carbon reaching peak, carbon neutralization' strategic targets, the recycling technology of low-grade waste heat is widely focused. The heat supply capacity of the heat source plant mainly depends on the water supply and return temperature of the primary heat supply network, the water return temperature of the heat supply network is reduced, the waste heat in the water is extracted, low-grade heat can be utilized, the heat supply capacity can be increased, and more economic benefits are brought to the heat source plant. How to increase the heat supply capacity of the final heat exchange station by recovering the backwater waste heat of the heat supply network becomes an actual technical problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a large-temperature-difference heating system utilizing the backwater waste heat of a town heat network.
The specific scheme is as follows:
the utility model provides a utilize large temperature difference heating system of town heat supply network return water waste heat, includes heat source factory, central heating one-level heat supply network delivery pipe, central heating one-level heat supply network return pipe, waste heat recovery system, heat user's second grade heat supply network return pipe and heat user's second grade heat supply network delivery pipe pass through waste heat recovery system with central heating one-level heat supply network return pipe heat exchange connection, central heating one-level heat supply network return pipe and central heating one-level heat supply network delivery pipe with heat source factory pipe piping connection.
The waste heat recovery system comprises a heat exchanger and a heat pump, the heat exchanger and the heat pump are connected in series through a pipeline, the heat user secondary heat supply network water return pipe is connected with the central heating primary heat supply network water return pipe through the heat exchanger in a heat exchange mode, and the heat user secondary heat supply network water supply pipe is connected with the central heating primary heat supply network water return pipe through the heat pump in a heat exchange mode.
The heat source plant is any one of a coal-fired power plant, a gas-fired power plant, a thermal power plant or a boiler room.
The heat exchangers are water-water heat exchangers, and the number of the heat exchangers is at least 1.
The heat pump is an electrically driven compression heat pump, and the number of the heat pumps is at least 1.
The utility model discloses a large-temperature-difference heat supply system utilizing the backwater waste heat of a town heat network, which is provided with a heat exchanger and a heat pump at the same time, carries out two-stage recovery on the heat of water in a first-stage heat network, can heat water in a second-stage heat network while reducing the recovery temperature, improves the recovery utilization rate of backwater waste heat of the heat network, increases the heat supply capacity,
compared with the prior art, the method has the following beneficial effects:
(1) The temperature gradient utilization is realized through the two-stage heat exchange of the heat exchanger and the heat pump, the heat exchange loss is reduced, and the heat exchange efficiency is improved;
(2) The return water temperature of the primary heat supply network can be reduced to the greatest extent, so that the heat supply output of a heat source plant is improved;
(3) The large-temperature-difference heat supply system can independently operate when the heat supply network fails, and peak shaving can be performed when the heat supply network capacity is insufficient, so that the heat supply capacity, the heat supply reliability and the flexibility of the final heat exchange station are improved.
Drawings
Fig. 1 is a schematic view of the structure of the present utility model.
The system comprises a heat source plant 101, a central heating primary heat supply network water supply pipe 102, a central heating primary heat supply network water return pipe 103, a 104-waste heat recovery system, a 105-heat exchanger, a 106-heat pump, a 107-heat user secondary heat supply network water return pipe and a 108-heat user secondary heat supply network water supply pipe.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. It will be apparent to those skilled in the art that the described embodiments are only a part, but not all, of the implementations of the utility model, and that all other embodiments, based on which those skilled in the art will come to lie within the scope of the utility model without making any inventive effort.
As shown in fig. 1, the large-temperature-difference heat supply system utilizing urban heat supply network backwater waste heat comprises a heat source plant 101, a central heating primary heat supply network water supply pipe 102, a central heating primary heat supply network backwater pipe 103, a waste heat recovery system 104, a heat user secondary heat supply network backwater pipe 107 and a heat user secondary heat supply network water supply pipe 108, wherein the heat user secondary heat supply network backwater pipe 107 and the heat user secondary heat supply network water supply pipe 108 are in heat exchange connection with the central heating primary heat supply network backwater pipe 103 through the waste heat recovery system 104, and the central heating primary heat supply network backwater pipe 103 and the central heating primary heat supply network water supply pipe 102 are in pipeline connection with the heat source plant 101.
The waste heat recovery system 104 comprises a heat exchanger 105 and a heat pump 106, and two sides of the waste heat recovery system 104 are respectively connected with a central heating primary heat supply network water return pipe 103, a heat user secondary heat supply network water return pipe 107 and a heat user secondary heat supply network water supply pipe 108 in a pipeline manner.
The heat exchanger 105 and the heat pump 106 in the waste heat recovery system 104 are connected in series, the heat medium inlet of the heat exchanger 105 is connected with the primary heat supply network water return pipe 103, the heat medium outlet is connected with the waste heat source inlet of the heat pump 106, and the waste heat source outlet of the heat pump 106 is connected back to the primary heat supply network water return pipe 103 to complete heat exchange circulation for primary heat supply network water return.
The refrigerant medium inlet of the heat exchanger 105 is connected with a heat user secondary heat supply network water return pipe 107, the refrigerant medium outlet is connected with a heat pump 106 heating hot water inlet, and the heating hot water outlet is connected with a heat user secondary heat supply network water supply pipe 108 to complete heat exchange circulation for secondary heat supply network water supply and return.
In this embodiment, the heat source plant 101 is any one of a coal-fired power plant, a gas-fired power plant, a thermal power plant, or a boiler room. The heat source plant 101 realizes central heat supply to towns through a central heat supply primary heat supply network water supply pipe 102 and a central heat supply primary heat supply network return pipe 103, primary heat supply network return water is used as a heat medium and is connected into the heat exchanger 105 through a pipeline, and the heat of the primary heat supply network return water is utilized to heat the secondary heat supply network return water for the first time. The primary heat exchange is carried out, the secondary heat supply network backwater is connected into the heat pump 106 and is used as a waste heat source, the secondary heat supply network backwater is connected into the heat pump 106 and is used as heated hot water, and the heat pump 106 is driven by electric power to further recover the heat of the primary heat supply network backwater and is used for carrying out secondary heating on the secondary heat supply network backwater, so that the secondary heat supply network backwater reaches the temperature required by heat supply and is connected into a secondary heat supply network water supply pipeline.
The temperature of the primary heat supply network backwater is reduced after twice heat exchange, and the primary heat supply network backwater pipe 103 is connected back to the central heat supply primary heat supply network, so that the recovery and utilization of the primary heat supply network backwater waste heat are completed, and meanwhile, the heat supply capacity is increased, and the purpose of energy conservation is achieved.
The heat exchanger 105 is a water-water heat exchanger, which may be in the form of a shell-and-tube heat exchanger or a plate heat exchanger, preferably a plate heat exchanger in the present embodiment, the number of heat exchangers being at least one.
The heat pump 106 is an electrically driven compression heat pump, and the number of the heat pumps is at least one.
The heat exchanger 105 and the heat pump 106 are arranged in series to form the waste heat recovery system 104 together, one end of the waste heat recovery system 104 is connected with the primary heat supply network water return pipe 103 for central heating, the other end of the waste heat recovery system 104 is connected with the secondary heat supply network water return pipe 107 for heat users and the secondary heat supply pipe 108 for heat users, and the waste heat recovery system recovers heat of the heat return of the heat supply network in two stages.
The heat exchanger 105 is used as a first-stage waste heat recovery device, the first-stage heat supply network backwater is firstly connected into the heat exchanger 105 to exchange heat with the second-stage heat supply network backwater, and the second-stage heat supply network backwater is heated in the heat exchanger 105 for the first time and then connected to the heat pump 106.
The heat pump 106 is an electrically driven compression heat pump, and is used as a second-stage waste heat recovery device, the return water of the primary heat supply network is connected to the heat pump 106 as a waste heat source after heat exchange and temperature reduction, the primary heat supply network water is cooled and released again in the heat pump 106, and then is connected back to the primary heat supply network return water pipe through a pipeline, so that circulation is completed. And after the second-level heat supply network water enters the heat pump, absorbing heat released by the first-level heat supply network water to heat for the second time, and after the heat supply parameters are reached, connecting the second-level heat supply network water supply pipeline to the heat user to complete the heat supply cycle.
The large-temperature-difference heat supply system utilizing the return water waste heat of the town heat network is provided with the heat exchanger 105 and the heat pump 106, the heat of the primary heat network water is recovered in two stages, the recovery temperature is reduced, the secondary heat network water can be heated, the recovery utilization rate of the return water waste heat of the heat network is improved, and the heat supply capacity is increased.
The large-temperature-difference heating system utilizing the backwater waste heat of the town heat network can supply heat independently on the side of a heat user, can be connected with the original secondary heating system of the heat user in parallel to be mutually standby, and can perform heat load peak regulation and increase the heat supply capacity when the heat supply capacity is insufficient in severe cold weather.
The utility model discloses a large-temperature-difference heat supply system utilizing return water waste heat of a town heat network, which is provided with a heat exchanger and a heat pump at the same time, and is used for carrying out two-stage recovery on the water heat of a primary heat network, so that the recovery temperature is reduced, and meanwhile, the water of a secondary heat network can be heated, the recovery utilization rate of the return water waste heat of the heat network is improved, and the heat supply capacity is increased, and compared with the prior art, the system has the following beneficial effects:
(1) The temperature gradient utilization is realized through the two-stage heat exchange of the heat exchanger and the heat pump, the heat exchange loss is reduced, and the heat exchange efficiency is improved;
(2) The return water temperature of the primary heat supply network can be reduced to the greatest extent, so that the heat supply output of a heat source plant is improved;
(3) The large-temperature-difference heat supply system can independently operate when the heat supply network fails, and peak shaving can be performed when the heat supply network capacity is insufficient, so that the heat supply capacity, the heat supply reliability and the flexibility of the final heat exchange station are improved.
The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (5)
1. A large-temperature-difference heating system utilizing return water waste heat of a town heat network is characterized in that: including heat source factory (101), central heating one-level heat supply network delivery pipe (102), central heating one-level heat supply network wet return (103), waste heat recovery system (104), heat consumer second grade heat supply network wet return (107) and heat consumer second grade heat supply network delivery pipe (108) pass through waste heat recovery system (104) with central heating one-level heat supply network wet return (103) heat exchange connection, central heating one-level heat supply network wet return (103) and central heating one-level heat supply network delivery pipe (102) with heat source factory (101) pipe connection.
2. The large temperature difference heating system utilizing return water waste heat of town heat network as claimed in claim 1, wherein: the waste heat recovery system (104) comprises a heat exchanger (105) and a heat pump (106), the heat exchanger (105) and the heat pump (106) are arranged in series through pipelines, a heat user secondary heat supply network return pipe (107) is in heat exchange connection with the central heating primary heat supply network return pipe (103) through the heat exchanger (105), and a heat user secondary heat supply network water supply pipe (108) is in heat exchange connection with the central heating primary heat supply network return pipe (103) through the heat pump (106).
3. The large temperature difference heating system utilizing return water waste heat of town heat network as claimed in claim 1, wherein: the heat source plant (101) is any one of a coal-fired power plant, a gas-fired power plant, a thermal power plant or a boiler room.
4. The large temperature difference heating system utilizing return water waste heat of town heat network as claimed in claim 2, wherein: the heat exchangers (105) are water-water heat exchangers, and the number of the heat exchangers (105) is at least 1.
5. The large temperature difference heating system utilizing return water waste heat of town heat network as claimed in claim 2, wherein: the heat pump (106) is an electrically driven compression heat pump, and the number of the heat pumps (106) is at least 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223551041.9U CN219103110U (en) | 2022-12-30 | 2022-12-30 | Large-temperature-difference heating system utilizing return water waste heat of town heat network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223551041.9U CN219103110U (en) | 2022-12-30 | 2022-12-30 | Large-temperature-difference heating system utilizing return water waste heat of town heat network |
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| CN219103110U true CN219103110U (en) | 2023-05-30 |
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| CN202223551041.9U Active CN219103110U (en) | 2022-12-30 | 2022-12-30 | Large-temperature-difference heating system utilizing return water waste heat of town heat network |
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