CN211120088U - Distributed heating system - Google Patents
Distributed heating system Download PDFInfo
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- CN211120088U CN211120088U CN201922235463.7U CN201922235463U CN211120088U CN 211120088 U CN211120088 U CN 211120088U CN 201922235463 U CN201922235463 U CN 201922235463U CN 211120088 U CN211120088 U CN 211120088U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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Abstract
The utility model discloses a distributed heating system, which utilizes a multi-stage countercurrent heat exchange system to utilize return water heat of a primary pipe network and reduce return water temperature of the primary pipe network or utilize return water heat of a secondary pipe network, wherein the multi-stage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporator, the condenser, the compressor and the throttling device are connected by pipelines to form a refrigerant circulation loop, an evaporator water outlet of an m-1 heat exchange unit is communicated with an evaporator water inlet of an m-1 heat exchange unit by a pipeline, a condenser water outlet of the m-1 heat exchange unit is communicated with a condenser water inlet of the m-1 heat exchange unit by a pipeline, wherein m is an arbitrary integer which is more than or equal to 2 and less than or equal to N, n is an integer of 2 or more.
Description
Technical Field
The utility model relates to a heat supply technical field, in particular to distributing type heating system.
Background
Along with the enlargement of the urban scale, the urban central heating area is continuously increased. In a traditional centralized heating system taking waste heat of a power plant as a heat source, steam extracted by a steam turbine and final-stage exhaust steam heat return water of a primary pipe network, heated hot water is conveyed to a heat exchange station through the primary pipe network and heats return water of a secondary pipe network through a primary heat exchanger, and the heated hot water of the secondary pipe network is supplied to a heat user for use. The return water temperature of the primary pipe network is higher, for example, about 50 ℃, so the return water of the primary pipe network still has certain utilization space. Secondly, the higher return water of the primary pipe network limits the full utilization of the waste heat of the steam turbine of the power plant. The secondary pipe network backwater also has a certain utilization scope. In addition, in the process of developing a heat energy recycling system, a device with high heat efficiency can bring good economic benefits.
SUMMERY OF THE UTILITY MODEL
To address at least one problem of the prior art, the present disclosure provides a distributed heating system.
According to one aspect of the disclosure, a distributed heat supply system comprises a multi-stage countercurrent heat exchange system, a primary pipe network and a secondary pipe network, wherein the evaporation side of the multi-stage countercurrent heat exchange system is connected in series with the primary pipe network, the condensation side of the multi-stage countercurrent heat exchange system is connected in series with the secondary pipe network, and the multi-stage countercurrent heat exchange system absorbs the heat of return water of the primary pipe network and heats the return water of the secondary pipe network;
the multistage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporators, the condensers, the compressors and the throttling devices are connected through pipelines to form a refrigerant circulation loop, an evaporator water outlet of an m-1 th heat exchange unit is communicated with an evaporator water inlet of an m-1 th heat exchange unit through a pipeline, a condenser water outlet of the m-1 th heat exchange unit is communicated with a condenser water inlet of the m-1 th heat exchange unit through a pipeline, m is any integer greater than or equal to 2 and less than or equal to N, and N is an integer greater than or equal to 2.
The beneficial effects of the embodiment are as follows: the multi-stage countercurrent heat exchange system absorbs the backwater heat of the primary pipe network and heats the backwater of the secondary pipe network, so that the utilization rate of the heat of the primary pipe network is improved; the return water temperature of a primary pipe network is reduced, and the waste heat of a power plant is fully utilized; the whole multi-stage countercurrent heat exchange system has higher heat efficiency.
In certain embodiments, the system further comprises a primary heat exchanger, wherein the primary heat exchanger is connected in series with the multi-stage countercurrent heat exchange system. The beneficial effects of the embodiment are as follows: the multi-stage countercurrent heat exchange system is suitable for the condition that a heat exchange station exists, absorbs the backwater heat of the primary pipe network and heats the backwater of the secondary pipe network, so that the utilization rate of the heat of the primary pipe network is improved; the return water temperature of the primary pipe network is reduced, and the waste heat of the power plant is fully utilized.
In certain embodiments, the evaporation side upstream of the multistage countercurrent heat exchange system is provided with a flow regulating device. The flow regulating device enables the return water of the primary pipe network to enter the evaporation side of the multi-stage countercurrent heat exchange system at a set flow.
In certain embodiments, water flowing from the evaporation side of the multi-stage counter-current heat exchange system is returned through a branch pipe upstream of the evaporation side of the multi-stage counter-current heat exchange system. The loop can adjust the water inlet temperature of the evaporation side of the multistage countercurrent heat exchange system.
In some embodiments, the primary piping network is provided with a flow regulating valve. The flow regulating valve is used for regulating the water flow of the primary pipe network.
According to another aspect of the present disclosure, a distributed heating system is provided, which includes a multi-stage countercurrent heat exchange system, a primary heat exchanger, a primary pipe network and a secondary pipe network;
returning water of the primary pipe network to enter an evaporation side of the multi-stage countercurrent heat exchange system;
the secondary pipe network backwater is divided into two paths, wherein one path enters the condensation side of the multistage countercurrent heat exchange system, the other path enters the primary heat exchanger, the two paths of backwater are heated and then converged, and a water supply temperature control valve is arranged at the converging position;
the multistage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporators, the condensers, the compressors and the throttling devices are connected through pipelines to form a refrigerant circulation loop, an evaporator water outlet of an m-1 th heat exchange unit is communicated with an evaporator water inlet of an m-1 th heat exchange unit through a pipeline, a condenser water outlet of the m-1 th heat exchange unit is communicated with a condenser water inlet of the m-1 th heat exchange unit through a pipeline, m is any integer greater than or equal to 2 and less than or equal to N, and N is an integer greater than or equal to 2.
The beneficial effects of the embodiment are as follows: the multi-stage countercurrent heat exchange system absorbs the backwater heat of the primary pipe network and heats the backwater of the secondary pipe network, so that the utilization rate of the heat of the primary pipe network is improved; the return water temperature of a primary pipe network is reduced, and the waste heat of a power plant is fully utilized; the water supply temperature control valve adjusts the flow distribution of the multistage countercurrent heat exchange system and the primary heat exchanger, and further adjusts the water supply temperature of the secondary heat supply network.
In certain embodiments, the evaporation side upstream of the multistage countercurrent heat exchange system is provided with a flow regulating device. The flow regulating device enables the return water of the primary pipe network to enter the evaporation side of the multi-stage countercurrent heat exchange system at a set flow.
In certain embodiments, water flowing from the evaporation side of the multi-stage counter-current heat exchange system is returned through a branch pipe upstream of the evaporation side of the multi-stage counter-current heat exchange system. The loop can adjust the water inlet temperature of the evaporation side of the multistage countercurrent heat exchange system.
In some embodiments, the primary piping network is provided with a flow regulating valve. The flow regulating valve is used for regulating the water flow of the primary pipe network.
According to another aspect of the present disclosure, a distributed heating system is provided, which includes a multi-stage countercurrent heat exchange system, a primary pipe network, a primary heat exchanger, and a secondary pipe network;
the evaporation side of the multi-stage countercurrent heat exchange system is connected with a second-stage pipe network in series, the return water of the second-stage pipe network flows into the evaporation side of the multi-stage countercurrent heat exchange system, and the multi-stage countercurrent heat exchange system absorbs the heat of the return water of the secondary pipe network and heats the water at the condensation side of the multi-stage countercurrent heat exchange system;
the multistage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporators, the condensers, the compressors and the throttling devices are connected through pipelines to form a refrigerant circulation loop, an evaporator water outlet of an m-1 th heat exchange unit is communicated with an evaporator water inlet of an m-1 th heat exchange unit through a pipeline, a condenser water outlet of the m-1 th heat exchange unit is communicated with a condenser water inlet of the m-1 th heat exchange unit through a pipeline, m is any integer greater than or equal to 2 and less than or equal to N, and N is an integer greater than or equal to 2.
The beneficial effects of the embodiment are as follows: the multi-stage countercurrent heat exchange system further utilizes the return water heat of the secondary pipe network 500 to supply heat for users, and creates conditions for reducing the return water temperature of the primary pipe network.
Drawings
Fig. 1 is a schematic view of a distributed heating system according to embodiment 1 of the present disclosure.
Fig. 2 is a schematic diagram of a heat exchange unit of a multi-stage counter-current heat exchange system in an embodiment of the disclosure.
Fig. 3 is a schematic diagram of a multi-stage counter-current heat exchange system in an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a distributed heating system according to embodiment 2 of the present disclosure.
Fig. 5 is a schematic diagram of a distributed heating system according to embodiment 3 of the present disclosure.
Fig. 6 is a schematic diagram of a distributed heating system according to embodiment 4 of the present disclosure.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the distributed heating system includes a multi-stage countercurrent heat exchange system 100, a primary pipe network 300, and a secondary pipe network 500.
The multistage countercurrent heat exchange system 100 comprises N heat exchange units 1 connected by a pipe, where N is an integer greater than or equal to 2, for example, N is 2, 3, 4, or 5. Referring to fig. 2, the heat exchange unit 1 includes an evaporator 11, a condenser 12, at least one compressor 13, and at least one throttling device 14, wherein the evaporator 11, the condenser 12, the compressor 13, and the throttling device 14 are connected by pipes to form a refrigerant circulation loop. The evaporator 11 may be a shell-and-tube evaporator or a plate evaporator. The condenser 12 may be a shell-and-tube condenser or a plate condenser. The evaporator 11 has an evaporator water inlet 111 and an evaporator water outlet 112. The condenser 12 has a condenser water inlet 121 and a condenser water outlet 122.
The refrigerant circulating loop has refrigerant circulating, and the refrigerant may be selected from refrigerant known by those skilled in the art, such as R134a type refrigerant, R134a has no damage to ozone layer, and has good safety performance. Hot water enters the evaporator 11 from the evaporator water inlet 111 of the evaporator 11, and cooling water enters the condenser 12 from the condenser water inlet 121 of the condenser 12. When the compressor 13 is operated, the compressor 13 sucks the low-pressure gaseous refrigerant coming out of the evaporator 11, is compressed by the compressor 13, increases the temperature and pressure of the refrigerant, and is sent to the condenser 12. In the condenser 12, the high-temperature and high-pressure gaseous refrigerant transfers heat to water in the condenser 12 and heats the water, while the gaseous refrigerant condenses into a liquid refrigerant. The liquid refrigerant passes through the throttling device 14 to become a low-pressure liquid refrigerant, and is sent to the evaporator, wherein the throttling device 14 is a throttling valve. In the evaporator, the low-temperature and low-pressure liquid refrigerant absorbs heat of water in the evaporator 11, thereby completing a refrigeration cycle. The heat of the water on the evaporation side is exchanged to the water on the condensation side through a refrigeration cycle.
In the multi-stage countercurrent heat exchange system 100 provided in this embodiment, the evaporator water outlet 112 of the m-1 th heat exchange unit 1 is communicated with the evaporator water inlet 111 of the m-th heat exchange unit 1 through a pipeline, the condenser water outlet 122 of the m-1 th heat exchange unit 1 is communicated with the condenser water inlet 121 of the m-1 th heat exchange unit 1 through a pipeline, where m is any integer greater than or equal to 2 and less than or equal to N, taking N ═ 3 as an example for specific description, please refer to fig. 3, three heat exchange units 1 are named as a heat exchange unit 1a, a heat exchange unit 1b and a heat exchange unit 1c, the heat exchange unit 1a includes an evaporator 11a and a condenser 12a, the evaporator 11a includes an evaporator water inlet 111a and an evaporator water outlet 112a, the condenser 12a includes a condenser water inlet 121a and a condenser water outlet 122a, the heat exchange unit 1b includes an evaporator 11b and a condenser 12b, the evaporator 11b includes an evaporator water inlet 111b and an evaporator water outlet 112b, the condenser 12b includes a condenser water outlet 121b, the condenser water outlet 122b includes a and a condenser water outlet 122c, the evaporator water outlet 121b and the condenser water outlet 112c, the condenser water outlet 122c is communicated with the condenser water inlet 121c through a and the condenser water outlet 112c through a pipeline, and the condenser water inlet 121c, and the condenser water outlet 12c are not limited in a, and the layout is not limited to be communicated with the condenser water inlet 121c, and the evaporator water inlet 121c, and the condenser water outlet 12c, and the evaporator water inlet 121c in.
The N evaporators 11 constitute an evaporation side of the multistage countercurrent heat exchange system 100 of the present disclosure, and the N condensers 12 constitute a condensation side of the multistage countercurrent heat exchange system 100 of the present disclosure. On the evaporation side of the multistage countercurrent heat exchange system 100, water enters the evaporation side from the evaporator water inlet 111 of the 1 st heat exchange unit 1 of the multistage countercurrent heat exchange system 100 and flows out from the evaporator water outlet 112 of the Nth heat exchange unit 1; on the condensation side of the multistage countercurrent heat exchange system 100, water enters the condensation side from the condenser water inlet 121 of the nth heat exchange unit 1 of the multistage countercurrent heat exchange system 100 and flows out from the condenser water outlet 122 of the 1 st heat exchange unit 1. Continuing to take N as an example, when the multistage countercurrent heat exchange system of the present disclosure is applied, water on the evaporation side enters from the evaporator water inlet 111a, is cooled step by step while passing through the evaporator 11a, the evaporator 11b, and the evaporator 11c, and flows out from the evaporator water outlet 112c, water on the condensation side enters from the condenser water inlet 121c, and water on the condensation side flows through the condenser 12c, the condenser 12b, and the condenser 12a, is heated step by step while heating, and flows out from the condenser water outlet 122a, so that the water on the evaporation side flows in a direction opposite to the water on the condensation side, thereby forming the multistage countercurrent heat exchange system. In the embodiment shown in fig. 3, a three-stage heat exchange mode is adopted, each stage of heat exchange unit is provided with a refrigerant circulating system, the inlet and outlet water of the evaporation side has large temperature difference, and the evaporation side has lower outlet water temperature.
Because the multistage countercurrent heat exchange system 100 adopts a multistage countercurrent mode, the temperature of water on the evaporation side is gradually reduced by the 1 st, 2 … N-1 and N evaporators, and the temperature of water on the condensation side is gradually increased by the N, N-1 … 2 and 1 st condensers, each heat exchange unit 1 has high thermal efficiency, and the multistage countercurrent heat exchange system 100 has high thermal efficiency as a whole.
Referring to fig. 1, many heating islands in an urban area are not far away from the primary pipe network 300, and the distributed heating system shown in fig. 1 directly utilizes the return water heat of the primary pipe network 300. In the embodiment shown in fig. 1, the evaporation side of the multi-stage countercurrent heat exchange system 100 is connected in series to the primary pipe network 300, and the condensation side of the multi-stage countercurrent heat exchange system 100 is connected in series to the secondary pipe network 500.
The primary pipe network 300 is provided with a flow regulating device 600, and specifically, the flow regulating device 600 is disposed at the upstream of the multistage countercurrent heat exchange system 100. Usually, the return water temperature of the primary pipe network 300 is about 50 ℃, before entering the evaporation side of the multistage countercurrent heat exchange system 100, the return water of the primary pipe network 300 is properly cooled, specifically, the partial return water flowing out from the evaporation side of the multistage countercurrent heat exchange system 100 flows back to the upstream of the flow regulating device 600 through the branch pipe 900, and the return water of the branch pipe 900 is mixed with the return water of the primary pipe network 300 so as to regulate the inlet water temperature of the evaporation side of the multistage countercurrent heat exchange system 100. The primary pipe network 300 is further provided with a flow regulating valve 700 for regulating the flow of the primary pipe network 300.
On the primary pipe network side, the return water of the primary pipe network 300 is mixed with the return water of the branch pipe 900, and then enters the evaporation side of the multistage countercurrent heat exchange system 100 through the flow regulating device 600 at a set flow rate and temperature, and flows out after being cooled. On the secondary pipe network side, the secondary heat supply network 500 backwater enters the condensation side of the multistage countercurrent heat exchange system 100, and flows out after being heated up to be supplied to a heat user for use.
In the embodiment, the multi-stage countercurrent heat exchange system 100 absorbs the return water heat of the primary pipe network 300, heats the hot water of the secondary pipe network 500, and recovers a large amount of return water heat of the primary pipe network 300 by using a small amount of electric energy of the compressor, so that the return water heat of the primary pipe network 300 can be further utilized; and secondly, the return water temperature of the primary pipe network 300 can be reduced (for example, the return water temperature of the primary pipe network 300 can be reduced from 50 ℃ to 25 ℃), and the waste heat of a steam turbine of a power plant can be fully utilized.
Example 2
Referring to fig. 4, for the existing heat exchange station, the distributed heat supply system includes a multi-stage countercurrent heat exchange system 100, a primary pipe network 300, a primary heat exchanger 400, and a secondary pipe network 500. Wherein, the multistage countercurrent heat exchange system 100 refers to the multistage countercurrent heat exchange system 100 of example 1. The multistage countercurrent heat exchange system 100 is connected in series with the primary heat exchanger 400 of the heat exchange station, i.e., the primary pipe network 300 supplies water to enter the primary heat exchanger 400, flows into the evaporation side of the multistage countercurrent heat exchange system 100 after being cooled, and flows out from the evaporation side of the multistage countercurrent heat exchange system 100 after being cooled again; the return water of the secondary pipe network 500 enters the condensation side of the multistage countercurrent flow heat exchange system 100, flows into the primary heat exchanger 400 after being heated up, and flows out of the primary heat exchanger 400 after being heated up again.
The primary pipe network 300 is provided with a flow regulating device 600, and specifically, the flow regulating device 600 is disposed at the upstream of the multistage countercurrent heat exchange system 100. Part of the backwater flowing out of the evaporation side of the multi-stage countercurrent heat exchange system 100 flows back to the upstream of the flow regulating device 600 through the branch pipe 900, and is used for regulating the inflow water temperature of the evaporation side of the multi-stage countercurrent heat exchange system 100. The primary pipe network 300 is further provided with a flow regulating valve 700 for regulating the flow of the primary pipe network 300.
On the primary pipe network side, the water supplied to the primary pipe network 300 enters the primary heat exchanger 400, flows out of the primary heat exchanger 400 after being cooled, is mixed with the reflux of the branch pipe 900, and then passes through the flow regulating device 600, so that the return water of the primary pipe network 300 enters the evaporation side of the multistage countercurrent heat exchange system 100 at a set flow rate and temperature, and flows out after being cooled. On the secondary pipe network side, the return water of the secondary pipe network 500 enters the condensation side of the multistage countercurrent heat exchange system 100, enters the primary heat exchanger 400 after being heated, and is supplied to a hot user as the secondary pipe network 500 after being heated again.
In the embodiment, the multi-stage countercurrent heat exchange system 100 absorbs the return water heat of the primary pipe network 300, heats the hot water of the secondary pipe network 500, and recovers a large amount of return water heat energy of the primary pipe network 300 by using a small amount of electric energy of the compressor, so that the return water heat of the primary pipe network 300 can be further utilized, and the return water temperature of the primary pipe network 300 can be reduced.
Example 3
Referring to fig. 5, the distributed heating system includes a multi-stage countercurrent heat exchange system 100, a primary pipe network 300, a primary heat exchanger 400, and a secondary pipe network 500. Wherein, the multistage countercurrent heat exchange system 100 refers to the multistage countercurrent heat exchange system 100 of example 1.
The primary pipe network 300 is provided with a flow regulating device 600, and specifically, the flow regulating device 600 is disposed at the upstream of the multistage countercurrent heat exchange system 100. Part of the backwater flowing out of the evaporation side of the multi-stage countercurrent heat exchange system 100 flows back to the upstream of the flow regulating device 600 through the branch pipe 900, and is used for regulating the inflow water temperature of the evaporation side of the multi-stage countercurrent heat exchange system 100. The primary pipe network 300 is further provided with a flow regulating valve 700, and the flow regulating valve 700 is installed at the downstream of the multistage countercurrent heat exchange system 100 and used for regulating the flow of the primary pipe network 300.
The condensing side of the multi-stage countercurrent heat exchange system 100 and the first-stage heat exchanger 400 adopt a parallel heating mode. On the primary pipe network side, the primary pipe network 300 supplies water to enter the primary heat exchanger 400, flows out after cooling, is mixed with the backflow of the branch pipe 900, and then passes through the flow regulating device 600, so that the return water of the primary pipe network 300 enters the evaporation side of the multistage countercurrent heat exchange system 100 at a set flow rate and temperature, and flows out of the evaporation side after cooling again. On the secondary pipe network side, the secondary pipe network 500 backwater is divided into two paths, wherein one path enters the primary heat exchanger 400, the other path enters the condensation side of the multistage countercurrent heat exchange system 100, then the two paths of hot water are heated and merged, and a water supply temperature control valve 800 is arranged at the merging position.
In the embodiment, the multi-stage countercurrent heat exchange system 100 absorbs the return water heat of the primary pipe network 300 and heats the hot water of the secondary pipe network 500, the return water heat of the primary pipe network 300 is utilized, and the return water temperature of the primary pipe network 300 is reduced. The water supply temperature control valve 800 distributes the flow rates of the multi-stage countercurrent heat exchange system 100 and the primary heat exchanger 400, and adjusts the water supply temperature of the secondary pipe network 500.
Example 4
Referring to fig. 6, the present embodiment provides a distributed heating system, which includes a multi-stage countercurrent heat exchange system 100, a primary pipe network 300, a primary heat exchanger 400, and a secondary pipe network 500. Wherein, the multistage countercurrent heat exchange system 100 refers to the multistage countercurrent heat exchange system 100 of example 1.
The evaporation side of the multi-stage countercurrent heat exchange system 100 is connected in series to the secondary pipe network 500. On the primary pipe network side, the primary pipe network 300 supplies water to enter the primary heat exchanger 400, and flows out of the primary heat exchanger 400 after being cooled. On the secondary pipe network side, the return water of the secondary pipe network 500 enters the evaporation side of the multistage countercurrent heat exchange system 100, enters the primary heat exchanger 400 after being cooled, and flows out of the primary heat exchanger 400 after being heated.
The high-temperature water supply of the primary pipe network 300 heats the secondary pipe network 500 through the primary heat exchanger 400, and the heated hot water of the secondary pipe network 500 is supplied to a hot user for use. The return water temperature of the secondary pipe network 500 is usually 40-45 ℃, in this embodiment, the multi-stage counter-flow heat exchange system 100 is used to absorb the heat of the return water of the secondary pipe network 500 again, the refrigeration cycle loop is used to absorb the heat of the return water of the secondary pipe network 500 and heat the hot water at the condensation side of the multi-stage counter-flow heat exchange system 100, and the hot water flowing out from the condensation side of the multi-stage counter-flow heat exchange system 100 can be supplied to other hot users for. In this embodiment, the multi-stage countercurrent heat exchange system 100 further utilizes the heat of the return water of the secondary pipe network 500. The return water temperature of the secondary pipe network 500 is reduced, so that conditions are created for reducing the return water temperature of the primary pipe network 300.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (10)
1. A distributed heating system is characterized by comprising a multi-stage countercurrent heat exchange system, a primary pipe network and a secondary pipe network, wherein the evaporation side of the multi-stage countercurrent heat exchange system is connected in series with the primary pipe network, the condensation side of the multi-stage countercurrent heat exchange system is connected in series with the secondary pipe network, and the multi-stage countercurrent heat exchange system absorbs the heat of return water of the primary pipe network and heats the return water of the secondary pipe network;
the multistage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporators, the condensers, the compressors and the throttling devices are connected through pipelines to form a refrigerant circulation loop, the evaporator water outlet of the (m-1) th heat exchange unit is communicated with the evaporator water inlet of the (m-1) th heat exchange unit through a pipeline, the condenser water outlet of the (m-1) th heat exchange unit is communicated with the condenser water inlet of the (m-1) th heat exchange unit through a pipeline, m is any integer greater than or equal to 2 and less than or equal to N, and N is an integer greater than or equal to 2.
2. A distributed heating system according to claim 1, further comprising a primary heat exchanger connected in series with the multi-stage counter-current heat exchange system.
3. A distributed heating system according to claim 1 or 2, wherein a flow regulating device is provided upstream of the evaporation side of the multistage countercurrent heat exchange system to regulate the amount of water entering the evaporation side.
4. A distributed heat supply system according to claim 1 or 2, wherein water flowing from the evaporation side of the multi-stage counter-current heat exchange system is returned through a branch pipe upstream of the evaporation side of the multi-stage counter-current heat exchange system.
5. A distributed heating system according to claim 1 or 2, wherein said primary pipe network is provided with flow regulating valves.
6. A distributed heating system is characterized by comprising a multi-stage countercurrent heat exchange system, a primary heat exchanger, a primary pipe network and a secondary pipe network;
returning water of the primary pipe network to enter an evaporation side of the multi-stage countercurrent heat exchange system;
the secondary pipe network backwater is divided into two paths, wherein one path enters the condensation side of the multistage countercurrent heat exchange system, the other path enters the primary heat exchanger, the two paths of backwater are heated and then converged, and a water supply temperature control valve is arranged at the converging position;
the multistage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporators, the condensers, the compressors and the throttling devices are connected through pipelines to form a refrigerant circulation loop, the evaporator water outlet of the (m-1) th heat exchange unit is communicated with the evaporator water inlet of the (m-1) th heat exchange unit through a pipeline, the condenser water outlet of the (m-1) th heat exchange unit is communicated with the condenser water inlet of the (m-1) th heat exchange unit through a pipeline, m is any integer greater than or equal to 2 and less than or equal to N, and N is an integer greater than or equal to 2.
7. The distributed heating system according to claim 6, wherein a flow regulating device is provided upstream of the evaporation side of the multistage countercurrent heat exchange system to regulate the temperature of water entering the evaporation side.
8. A distributed heat supply system according to claim 6 or 7, wherein water flowing from the evaporation side of the multi-stage counter-current heat exchange system is returned through a branch pipe upstream of the evaporation side of the multi-stage counter-current heat exchange system.
9. A distributed heating system according to claim 6 or 7, wherein said primary pipe network is provided with flow regulating valves.
10. A distributed heat supply system is characterized by comprising a multi-stage countercurrent heat exchange system, a primary pipe network, a primary heat exchanger and a secondary pipe network;
the evaporation side of the multi-stage countercurrent heat exchange system is connected in series with a secondary pipe network, secondary pipe network return water flows into the evaporation side of the multi-stage countercurrent heat exchange system, and the multi-stage countercurrent heat exchange system absorbs the heat of the secondary pipe network return water and heats water on the condensation side of the multi-stage countercurrent heat exchange system;
the multistage countercurrent heat exchange system comprises N heat exchange units connected by pipelines, each heat exchange unit comprises an evaporator, a condenser, at least one compressor and at least one throttling device, the evaporators, the condensers, the compressors and the throttling devices are connected through pipelines to form a refrigerant circulation loop, the evaporator water outlet of the (m-1) th heat exchange unit is communicated with the evaporator water inlet of the (m-1) th heat exchange unit through a pipeline, the condenser water outlet of the (m-1) th heat exchange unit is communicated with the condenser water inlet of the (m-1) th heat exchange unit through a pipeline, m is any integer greater than or equal to 2 and less than or equal to N, and N is an integer greater than or equal to 2.
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| CN201922235463.7U CN211120088U (en) | 2019-12-13 | 2019-12-13 | Distributed heating system |
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| CN201922235463.7U CN211120088U (en) | 2019-12-13 | 2019-12-13 | Distributed heating system |
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