CN209840253U - Heat pump system for power plant waste heat cold and hot coupling utilization - Google Patents
Heat pump system for power plant waste heat cold and hot coupling utilization Download PDFInfo
- Publication number
- CN209840253U CN209840253U CN201920706140.9U CN201920706140U CN209840253U CN 209840253 U CN209840253 U CN 209840253U CN 201920706140 U CN201920706140 U CN 201920706140U CN 209840253 U CN209840253 U CN 209840253U
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- pipeline
- cooling water
- water
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- circulating cooling
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- 230000008878 coupling Effects 0.000 title claims abstract description 9
- 238000010168 coupling process Methods 0.000 title claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 9
- 239000010908 plant waste Substances 0.000 title claims description 3
- 239000000498 cooling water Substances 0.000 claims abstract description 126
- 238000001816 cooling Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 128
- 238000000605 extraction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000007710 freezing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 18
- 239000002918 waste heat Substances 0.000 abstract description 18
- 238000005057 refrigeration Methods 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A heat pump system for cold-hot coupling utilization of waste heat of a power plant relates to a heat pump system. The current heat pump system can not realize the purposes of heat supply in heating seasons and refrigeration in summer. The heat pump system for utilizing the waste heat of the circulating cooling water is improved on the basis of the existing heat pump system, the circulating cooling water pipeline is connected with the high-temperature heat source side and the low-temperature heat source side of the heat pump at the same time, and the circulating cooling water can be used as a low-temperature heat source under the heating working condition of the heat pump or a high-temperature heat source under the refrigerating working condition of the heat pump, namely cooling water, through the switching of a valve. The circulating cooling water waste heat utilization heat pump system can supply heat in a heating season and refrigerate in summer, so that the cooling and heating coupling utilization of the circulating cooling water waste heat of the power plant is realized, the cost is saved, and the utilization efficiency of the system is improved. The utility model is used for heat pump system.
Description
Technical Field
The utility model relates to a heat pump system, concretely relates to heat pump system that power plant's waste heat cold and hot coupling utilized.
Background
With the increasing consumption of non-renewable energy sources such as fossil fuels, the global energy situation is more and more severe, energy conservation becomes a hot spot of people's attention, and energy conservation is generally recognized as the fifth most energy source in the world. Due to various reasons such as insufficient recognition and insufficient technical conditions, a lot of waste heat resources are wasted in the current industrial field, for example, heat energy released in various technological processes of steel mills, chemical plants and the like is insufficient for large-scale recycling because of too small amount of energy, or the energy quality is low due to low temperature and cannot meet the utilization requirement, so that the waste heat is wasted. Especially, the circulating cooling water waste heat of the power plant has the circulating efficiency of less than 40 percent, most of heat loss is discharged to the environment through the circulating cooling water, and the temperature of the circulating cooling water is only about 30 ℃, so that the circulating cooling water cannot be directly recycled. However, with the development of heat pump technology, especially the emergence of large-scale high-temperature water source heat pumps, the waste heat recovery of circulating cooling water of a power plant becomes possible. At present, the circulating cooling water waste heat utilization heat pump system of a power plant utilizes a heat pump to recover circulating cooling water waste heat for preheating circulating water of a heat supply network in a heating season, the system can only operate in the heating season, the system stops operating after the heating season is finished, and the utilization rate of the heat pump system cannot be fully exerted.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve is: the existing heat pump system can not realize the purposes of heat supply in a heating season and refrigeration in summer, and further provides a heat pump system for cold and heat coupling utilization of waste heat of a power plant.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
the heat pump system comprises a steam turbine 1, a condenser 2, a water cooling tower 3, a heat pump 4, a heat supply network heater 5, a heat exchanger 6, an air cooling heat exchanger 7, a plurality of pipelines and a plurality of valves, wherein a steam exhaust port of the steam turbine 1 is connected with a steam inlet of the condenser 2, a water outlet of the condenser 2 is connected with a water inlet of the water cooling tower 3 through a first circulating cooling water pipeline 9, an inlet on the low-temperature heat source side of the heat pump 4 is connected to the first circulating cooling water pipeline 9 through a second circulating cooling water pipeline 10, an outlet on the low-temperature heat source side of the heat pump 4 is connected to a forebay water inlet of the water cooling tower 3 through a third circulating cooling water pipeline 11, and a forebay water outlet of the water cooling tower 3 is connected with a water inlet of the condenser; the water outlet of the heat exchanger 6 is connected with the inlet on the high-temperature heat source side of the heat pump 4 through a heat supply network circulating water return pipeline 13, the outlet on the high-temperature heat source side of the heat pump 4 is connected with the water inlet of the heat supply network heater 5 through a heat supply network circulating water pipeline 14, and the water outlet of the heat supply network heater 5 is connected with the water inlet of the heat exchanger 6 through a heat supply network circulating water supply pipeline; a water inlet of a fifth circulating cooling water pipeline 15 is connected with an outlet on the high-temperature heat source side of the heat pump 4, a water outlet of the fifth circulating cooling water pipeline 15 is connected with a second circulating cooling water pipeline 10, a water inlet of a sixth circulating cooling water pipeline 16 is connected with a third circulating cooling water pipeline 11, a water outlet of the sixth circulating cooling water pipeline 16 is connected with an inlet on the high-temperature heat source side of the heat pump 4, a water inlet of a seventh circulating cooling water pipeline 8 is connected with a fourth circulating cooling water pipeline 12, and a water outlet of the seventh circulating cooling water pipeline 8 is connected with the third circulating cooling water pipeline 11; a water outlet of the air-cooled heat exchanger 7 is connected with an inlet on the low-temperature heat source side of the heat pump 4 through a chilled water return pipeline 17, and an outlet on the low-temperature heat source side of the heat pump 4 is connected with a water inlet of the air-cooled heat exchanger 7 through a chilled water supply pipeline 18; a first valve 19 is installed on the second circulating cooling water pipeline 10, the first valve 19 is positioned on a pipeline between the connection point of the fifth circulating cooling water pipeline 15 and the second circulating cooling water pipeline 10 and the inlet on the low-temperature heat source side of the heat pump 4, a second valve 20 and a ninth valve 27 are respectively installed on the third circulating cooling water pipeline 11, the second valve 20 is positioned on a pipeline between the connection point of the sixth circulating cooling water pipeline 16 and the third circulating cooling water pipeline 11 and the outlet on the low-temperature heat source side of the heat pump 4, the ninth valve 27 is positioned on a pipeline between the connection point of the seventh circulating cooling water pipeline 8 and the third circulating cooling water pipeline 11 and the front pool water inlet of the cooling tower 3, a third valve 21 is installed on the heat network circulating water pipeline 14, a fourth valve 22 is installed on the heat network circulating water return pipeline 13, a fifth valve 23 is installed on the fifth circulating cooling water pipeline 15, a sixth valve 24 is installed on the sixth circulating cooling water pipeline 16, a seventh valve 25 is installed on the chilled water return pipeline 17, an eighth valve 26 is installed on the chilled water supply pipeline 18, and a tenth valve 28 is installed on the seventh circulating cooling water pipeline 8.
Further, a circulating cooling water pump is installed on the fourth circulating cooling water pipeline 12, the circulating cooling water pump is located on a pipeline between a connection point of the seventh circulating cooling water pipeline 8 and the fourth circulating cooling water pipeline 12 and a water outlet of a front pool of the cooling tower 3, a heat supply network circulating water pump is installed on the heat supply network circulating water return pipeline 13, and a freezing water pump is installed on the freezing water return pipeline 17.
Further, the steam extraction port of the steam turbine 1 is connected with the steam inlet port of the heat supply network heater 5 through a steam extraction pipeline, and an eleventh valve 29 is installed on the steam extraction pipeline.
The utility model has the advantages that:
the utility model discloses a to the transformation of circulating water waste heat utilization heat pump system on current heat pump system's basis, link to each other with the high temperature heat source side and the low temperature heat source side of heat pump simultaneously with the circulating water pipeline, through the switching of valve, the circulating water both can regard as the low temperature heat source of heat pump heating operating mode, also can regard as the high temperature heat source of heat pump refrigeration operating mode to be the cooling water promptly. Therefore, the circulating water waste heat utilization heat pump system can supply heat in a heating season and refrigerate in summer, and realizes cold-hot coupling utilization of circulating water waste heat of a power plant, so that the cost is saved, the utilization efficiency of the system is improved, and the utilization rate is improved by 30%.
Drawings
Fig. 1 is a schematic diagram of a heat pump system of the present invention;
FIG. 2 is a process flow chart of the heating working condition in the heating season of the utility model;
fig. 3 is the process flow chart of the cooling working condition in summer of the utility model.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings:
the first embodiment is as follows: as shown in fig. 1 to 3, the heat pump system according to the present embodiment includes a steam turbine 1, a condenser 2, a cooling tower 3, a heat pump 4, a heating network heater 5, a heat exchanger 6, an air-cooled heat exchanger 7, a plurality of pipelines, and a plurality of valves, wherein a steam exhaust port of the steam turbine 1 is connected to a steam inlet of the condenser 2, a water outlet of the condenser 2 is connected to a water supply port of the cooling tower 3 through a first circulating cooling water pipeline 9, an inlet on a low-temperature heat source side of the heat pump 4 is connected to the first circulating cooling water pipeline 9 through a second circulating cooling water pipeline 10, an outlet on the low-temperature heat source side of the heat pump 4 is connected to a forebay water inlet of the cooling tower 3 through a third circulating cooling water pipeline 11, and a forebay water outlet of the cooling tower 3 is connected to a water inlet of the;
the water outlet of the heat exchanger 6 is connected with the inlet on the high-temperature heat source side of the heat pump 4 through a heat supply network circulating water return pipeline 13, the outlet on the high-temperature heat source side of the heat pump 4 is connected with the water inlet of the heat supply network heater 5 through a heat supply network circulating water pipeline 14, and the water outlet of the heat supply network heater 5 is connected with the water inlet of the heat exchanger 6 through a heat supply network circulating water supply pipeline;
a water inlet of a fifth circulating cooling water pipeline 15 is connected with an outlet on the high-temperature heat source side of the heat pump 4, a water outlet of the fifth circulating cooling water pipeline 15 is connected with a second circulating cooling water pipeline 10, a water inlet of a sixth circulating cooling water pipeline 16 is connected with a third circulating cooling water pipeline 11, a water outlet of the sixth circulating cooling water pipeline 16 is connected with an inlet on the high-temperature heat source side of the heat pump 4, a water inlet of a seventh circulating cooling water pipeline 8 is connected with a fourth circulating cooling water pipeline 12, and a water outlet of the seventh circulating cooling water pipeline 8 is connected with the third circulating cooling water pipeline 11;
a water outlet of the air-cooled heat exchanger 7 is connected with an inlet on the low-temperature heat source side of the heat pump 4 through a chilled water return pipeline 17, and an outlet on the low-temperature heat source side of the heat pump 4 is connected with a water inlet of the air-cooled heat exchanger 7 through a chilled water supply pipeline 18;
a first valve 19 is installed on the second circulating cooling water pipeline 10, the first valve 19 is positioned on a pipeline between the connection point of the fifth circulating cooling water pipeline 15 and the second circulating cooling water pipeline 10 and the inlet on the low-temperature heat source side of the heat pump 4, a second valve 20 and a ninth valve 27 are respectively installed on the third circulating cooling water pipeline 11, the second valve 20 is positioned on a pipeline between the connection point of the sixth circulating cooling water pipeline 16 and the third circulating cooling water pipeline 11 and the outlet on the low-temperature heat source side of the heat pump 4, the ninth valve 27 is positioned on a pipeline between the connection point of the seventh circulating cooling water pipeline 8 and the third circulating cooling water pipeline 11 and the front pool water inlet of the cooling tower 3, a third valve 21 is installed on the heat network circulating water pipeline 14, a fourth valve 22 is installed on the heat network circulating water return pipeline 13, a fifth valve 23 is installed on the fifth circulating cooling water pipeline 15, a sixth valve 24 is installed on the sixth circulating cooling water pipeline 16, a seventh valve 25 is installed on the chilled water return pipeline 17, an eighth valve 26 is installed on the chilled water supply pipeline 18, and a tenth valve 28 is installed on the seventh circulating cooling water pipeline 8.
The utility model discloses a to the transformation of circulating water waste heat utilization heat pump system on current heat pump system's basis, save the cost.
The second embodiment is as follows: as shown in fig. 1 to 3, a circulating cooling water pump is installed in the fourth circulating cooling water pipe 12 according to the present embodiment, the circulating cooling water pump is located in a pipe between a connection point of the seventh circulating cooling water pipe 8 and the fourth circulating cooling water pipe 12 and a front pool water outlet of the cooling tower 3, a heat supply network circulating water pump is installed in the heat supply network circulating water return pipe 13, and a chilled water pump is installed in the chilled water return pipe 17.
Other components and connection modes are the same as those of the first embodiment.
The third concrete implementation mode: as shown in fig. 1 to 3, the steam extraction port of the steam turbine 1 according to the present embodiment is connected to the steam inlet port of the heat supply network heater 5 through a steam extraction pipeline, and an eleventh valve 29 is installed on the steam inlet pipeline. The heat in the turbine 1 can be partly used to heat the heat supply network circulating water.
Other components and connection modes are the same as those of the first embodiment.
Principle of operation
As shown in fig. 2, in the heating condition in the heating season, the fifth valve 23, the sixth valve 24, the seventh valve 25, the eighth valve 26 and the tenth valve 28 are closed, the refrigeration circulating water system in which the air-cooled heat exchanger 7 at the cold user is located is stopped, the exhaust steam discharged from the steam turbine 1 enters the condenser 2, the heat of the exhaust steam is taken away by the circulating cooling water, a part of the heated circulating cooling water enters the cooling tower to discharge heat to the environment, the other part of the heated circulating cooling water enters the heat pump from the inlet of the warm water at the low-temperature side of the heat pump, is discharged from the outlet of the low-temperature heat source side of the heat pump, enters the front pool of the cooling tower through the third circulating cooling water pipe 11, enters the condenser through the fourth circulating cooling water pipe 12, the circulating water of the heat network, which flows back from the heat exchanger 6 at the heat user, enters the heat pump from the inlet of the high-temperature heat source side of the heat pump 4, and is, the circulating cooling water from the condenser 2 is used as a low-temperature heat source of the heat pump 4 in the process, the heat of the circulating cooling water is transferred to the circulating water of the heat supply network after being upgraded by the heat pump 4, the circulating water of the heat supply network is heated by the heat supply network heater and then is sent to a heat exchanger 6 of a heat user, and heat is provided for the heat user to supply heat, so that the circulation is repeated.
As shown in fig. 3, in the cooling operation in summer, the first valve 19, the second valve 20, the third valve 21, the fourth valve 22, the ninth valve 27 and the eleventh valve 29 are closed, the heat supply network circulating water system where the heat exchanger 6 at the heat consumer is located is stopped, exhaust gas exhausted from the steam turbine 1 enters the condenser 2, the heat of the exhaust gas is taken away by the circulating cooling water, the heated circulating cooling water enters the water cooling tower to discharge heat to the environment, another part of the circulating cooling water enters the heat pump from the inlet on the high-temperature heat source side of the heat pump 4 through the seventh circulating cooling water pipeline 8 and the third circulating cooling water pipeline 11, then is discharged from the outlet on the high-temperature heat source side of the heat pump 4, then flows through the fifth circulating cooling water pipeline 15 and the second circulating cooling water pipeline 10 to be collected with the circulating cooling water discharged from the condenser 2, enters the water cooling tower to discharge heat to the environment, and return water returned from the air-cooled heat exchanger 7 at the heat consumer is discharged from the heat pump 4 through the low-temperature condenser 17 An inlet on the heat source side enters the heat pump, is discharged from an outlet on the low-temperature heat source side of the heat pump, and enters the air-cooled heat exchanger 7 through a chilled water supply pipeline 18, in the process, a part of circulating cooling water which comes out from a front pool of the water cooling tower 3 is taken as a high-temperature heat source of the heat pump 4, and the heat of the chilled water return water is taken away, so that the temperature of the chilled water is reduced for refrigeration.
The utility model discloses link to each other circulating cooling water pipeline with the high temperature heat source side and the low temperature heat source side of heat pump simultaneously, through the switching of valve, circulating cooling water both can regard as the low temperature heat source of heat pump heating operating mode, also can regard as the high temperature heat source of heat pump refrigeration operating mode cooling water promptly. Therefore, the circulating cooling water waste heat utilization heat pump system can supply heat in a heating season and refrigerate in summer, the cooling and heating coupling utilization of the circulating cooling water waste heat of the power plant is realized, the cost is saved, and the utilization efficiency of the system is improved.
Claims (3)
1. A heat pump system for power plant waste heat cold-hot coupling utilization comprises a steam turbine (1), a condenser (2), a water cooling tower (3) and a heat pump (4), the system comprises a heat supply network heater (5), a heat exchanger (6), an air cooling heat exchanger (7), a plurality of pipelines and a plurality of valves, wherein a steam outlet of a steam turbine (1) is connected with a steam inlet of a condenser (2), a water outlet of the condenser (2) is connected with a water feeding port of a cooling tower (3) through a first circulating cooling water pipeline (9), an inlet on the low-temperature heat source side of a heat pump (4) is connected to the first circulating cooling water pipeline (9) through a second circulating cooling water pipeline (10), an outlet on the low-temperature heat source side of the heat pump (4) is connected to a forebay water inlet of the cooling tower (3) through a third circulating cooling water pipeline (11), and a water outlet of the cooling tower (3) is connected with a water inlet of the condenser (2) through a fourth circulating cooling water pipeline (12);
the water outlet of the heat exchanger (6) is connected with the inlet on the high-temperature heat source side of the heat pump (4) through a heat supply network circulating water return pipeline (13), the outlet on the high-temperature heat source side of the heat pump (4) is connected with the water inlet of the heat supply network heater (5) through a heat supply network circulating water pipeline (14), and the water outlet of the heat supply network heater (5) is connected with the water inlet of the heat exchanger (6) through a heat supply network circulating water supply pipeline;
the method is characterized in that: a water inlet of a fifth circulating cooling water pipeline (15) is connected with an outlet on the high-temperature heat source side of the heat pump (4), a water outlet of the fifth circulating cooling water pipeline (15) is connected to a second circulating cooling water pipeline (10), a water inlet of a sixth circulating cooling water pipeline (16) is connected to a third circulating cooling water pipeline (11), a water outlet of the sixth circulating cooling water pipeline (16) is connected with an inlet on the high-temperature heat source side of the heat pump (4), a water inlet of a seventh circulating cooling water pipeline (8) is connected to a fourth circulating cooling water pipeline (12), and a water outlet of the seventh circulating cooling water pipeline (8) is connected to the third circulating cooling water pipeline (11);
a water outlet of the air-cooled heat exchanger (7) is connected with an inlet on the low-temperature heat source side of the heat pump (4) through a chilled water return pipeline (17), and an outlet on the low-temperature heat source side of the heat pump (4) is connected with a water inlet of the air-cooled heat exchanger (7) through a chilled water supply pipeline (18);
a first valve (19) is arranged on the second circulating cooling water pipeline (10), the first valve (19) is positioned on a pipeline between the connection point of the fifth circulating cooling water pipeline (15) and the second circulating cooling water pipeline (10) and the inlet on the low-temperature heat source side of the heat pump (4), a second valve (20) and a ninth valve (27) are respectively arranged on the third circulating cooling water pipeline (11), the second valve (20) is positioned on a pipeline between the connection point of the sixth circulating cooling water pipeline (16) and the third circulating cooling water pipeline (11) and the outlet on the low-temperature heat source side of the heat pump (4), the ninth valve (27) is positioned on a pipeline between the connection point of the seventh circulating cooling water pipeline (8) and the third circulating cooling water pipeline (11) and the front pool water inlet of the water cooling tower (3), and a third valve (21) is arranged on the heat network circulating water pipeline (14), fourth valve (22) are installed to heat supply network circulating water return water pipeline (13), install fifth valve (23) on fifth recirculated cooling water pipeline (15), install sixth valve (24) on sixth recirculated cooling water pipeline (16), install seventh valve (25) on refrigerated water return water pipeline (17), install eighth valve (26) on refrigerated water supply pipe (18), install tenth valve (28) on seventh recirculated cooling water pipeline (8).
2. The heat pump system of claim 1, wherein: and a circulating cooling water pump is arranged on the fourth circulating cooling water pipeline (12), the circulating cooling water pump is positioned on a pipeline between the connection point of the seventh circulating cooling water pipeline (8) and the fourth circulating cooling water pipeline (12) and the water outlet of the front pool of the water cooling tower (3), a heat supply network circulating water pump is arranged on a heat supply network circulating water return pipeline (13), and a freezing water pump is arranged on a freezing water return pipeline (17).
3. The heat pump system of claim 1, wherein: and the steam extraction port of the steam turbine (1) is connected with the steam inlet of the heat supply network heater (5) through a steam extraction pipeline, and an eleventh valve (29) is installed on the steam extraction pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920706140.9U CN209840253U (en) | 2019-05-16 | 2019-05-16 | Heat pump system for power plant waste heat cold and hot coupling utilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920706140.9U CN209840253U (en) | 2019-05-16 | 2019-05-16 | Heat pump system for power plant waste heat cold and hot coupling utilization |
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| Publication Number | Publication Date |
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| CN209840253U true CN209840253U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920706140.9U Expired - Fee Related CN209840253U (en) | 2019-05-16 | 2019-05-16 | Heat pump system for power plant waste heat cold and hot coupling utilization |
Country Status (1)
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| CN (1) | CN209840253U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046238A (en) * | 2022-08-16 | 2022-09-13 | 石家庄诚峰热电有限公司 | Cold and hot dual supply system |
-
2019
- 2019-05-16 CN CN201920706140.9U patent/CN209840253U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046238A (en) * | 2022-08-16 | 2022-09-13 | 石家庄诚峰热电有限公司 | Cold and hot dual supply system |
| CN115046238B (en) * | 2022-08-16 | 2022-11-04 | 石家庄诚峰热电有限公司 | Cold and hot dual-supply system |
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Granted publication date: 20191224 |