CN218237608U - Heat pump step heating system for recycling waste heat of circulating water of thermal power plant - Google Patents
Heat pump step heating system for recycling waste heat of circulating water of thermal power plant Download PDFInfo
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- CN218237608U CN218237608U CN202222631872.0U CN202222631872U CN218237608U CN 218237608 U CN218237608 U CN 218237608U CN 202222631872 U CN202222631872 U CN 202222631872U CN 218237608 U CN218237608 U CN 218237608U
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- 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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Abstract
The utility model relates to a heat pump step heating system for recycling the waste heat of circulating water in a thermal power plant, which comprises a heat exchanger, a multi-stage heat pump, a circulating water tank and a connecting pipe; the cold fluid inlet of the heat exchanger introduces desalted water through a connecting pipe, the cold fluid outlet of the heat exchanger is communicated with the heat medium inlet of the multistage heat pump, and the heat medium outlet of the multistage heat pump is communicated with the inlet of the circulating water tank to form a heat release circulating subsystem; an outlet of the circulating water tank is communicated with a hot fluid inlet of the heat exchanger, and a hot fluid outlet of the heat exchanger is communicated with a refrigerant inlet of the multistage heat pump to form a waste heat recovery subsystem; the circulating water tank can be communicated with high-temperature circulating water of the cooling tower so as to raise the water temperature of the desalted water subjected to heat release by the multistage heat pump, and a refrigerant outlet of the multistage heat pump outputs the high-temperature desalted water treated by the multistage heat pump. The heat pump step heating system exchanges heat for circulating water flowing through the system for multiple times through the arrangement of the multistage heat pumps, recovers low-grade waste heat in the circulating water, and improves the recycling efficiency of the circulating water waste heat.
Description
Technical Field
The utility model relates to a waste heat recovery technical field of power plant especially relates to a heat pump step heating system of thermal power plant's circulating water waste heat recovery.
Background
The power generation mode of the power plant comprises pure condensation power generation, cogeneration and the like. After steam generated by the boiler of the pure condensing power plant drives the steam turbine generator unit to generate electricity, most of heat contained in the discharged steam is taken away by cooling water, so that the heat efficiency is low, and the heat efficiency of the pure condensing power plant with the single-machine capacity of more than 200MW is only 35-40%. Although the cogeneration technology can improve the utilization efficiency of energy, a large amount of exhaust heat is still released to the atmosphere by the circulating cooling water, so that the energy is wasted.
However, in the prior art, as disclosed in patent document CN102220888A, "method and system for recovering waste heat of circulating water in thermal power plant", the solution also has the problem of low energy conversion efficiency by adopting a heating mode of a peak heater. Therefore, how to improve the recycling efficiency of the circulating water waste heat of the thermal power plant becomes a problem to be solved urgently in the prior art.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In view of the above-mentioned shortcoming and the not enough of prior art, the utility model provides a heat pump step heating system of thermal power plant's circulating water waste heat recovery, its technical problem that the recycle efficiency is low that has solved thermal power plant's circulating water waste heat.
(II) technical scheme
In order to achieve the above object, the utility model discloses a heat pump step heating system of thermal power plant's circulating water waste heat recovery includes: the heat exchanger, the multistage heat pump, the circulating water tank and the connecting pipe;
a cold fluid inlet of the heat exchanger introduces desalted water through the connecting pipe, a cold fluid outlet of the heat exchanger is communicated with a heat medium inlet of the multi-stage heat pump, and a heat medium outlet of the multi-stage heat pump is communicated with an inlet of the circulating water tank, so that a heat release circulating subsystem is formed;
an outlet of the circulating water tank is communicated with a hot fluid inlet of the heat exchanger, and a hot fluid outlet of the heat exchanger is communicated with a refrigerant inlet of the multistage heat pump to form a waste heat recovery subsystem;
the circulating water tank can be communicated with high-temperature circulating water of the cooling tower so as to raise the water temperature of the desalted water subjected to heat release by the multistage heat pump, and a refrigerant outlet of the multistage heat pump can output the high-temperature desalted water treated by the multistage heat pump.
Optionally, the multistage heat pump comprises at least a first stage heat pump mechanism, a second stage heat pump mechanism, and a third stage heat pump mechanism;
a refrigerant inlet of the first-stage heat pump mechanism is communicated with a hot fluid outlet of the heat exchanger, a refrigerant inlet of the second-stage heat pump mechanism is communicated with a refrigerant outlet of the first-stage heat pump mechanism, a refrigerant inlet of the third-stage heat pump mechanism is communicated with a refrigerant outlet of the second-stage heat pump mechanism, and a refrigerant outlet of the third-stage heat pump mechanism is output to the outside;
the heat medium inlet of first order heat pump mechanism, second level heat pump mechanism, third level heat pump mechanism all with the cold fluid outlet of heat exchanger is linked together, the heat medium outlet of first order heat pump mechanism, second level heat pump mechanism, third level heat pump mechanism all with circulation tank's entry links to each other.
Optionally, the first stage heat pump mechanism, the second stage heat pump mechanism and the third stage heat pump mechanism each comprise an evaporator, a condenser, a waste heat recovery pipeline and a heat release circulation pipeline;
the condensers of the first-stage heat pump mechanism, the second-stage heat pump mechanism and the third-stage heat pump mechanism are sequentially communicated in series through the waste heat recovery pipeline, and a refrigerant inlet of the condenser of the first-stage heat pump mechanism is communicated with a hot fluid outlet of the heat exchanger through the waste heat recovery pipeline to form the waste heat recovery subsystem;
first order heat pump mechanism second level heat pump mechanism with third level heat pump mechanism the evaporimeter passes through heat release circulating line is in proper order parallel connection, the heat medium entry of evaporimeter passes through heat release circulating line all with the cold fluid outlet of heat exchanger is linked together, the heat medium export of evaporimeter all with circulation tank's entry is linked together in order to form heat release circulation subsystem.
Optionally, each of the first stage heat pump mechanism, the second stage heat pump mechanism and the third stage heat pump mechanism further includes a compressor and an expansion valve, and the evaporator, the compressor, the condenser and the expansion valve are sequentially and circularly communicated through a pipeline.
Optionally, the multistage heat pump is an electrically-driven heat pump, the electric power of the electrically-driven heat pump is 500kW to 600kW, and the heating capacity of the electrically-driven heat pump is 3.4MW to 3.8MW.
Optionally, a pressure pump is arranged before the cold fluid inlet of the heat exchanger and before the hot fluid inlet of the heat exchanger.
Optionally, the multistage heat pumps all use R134a as a refrigerant to flow inside the multistage heat pump, and demineralized water as a heated working medium flows through the multistage heat pump.
Optionally, a temperature sensor is arranged in the circulating water tank.
Optionally, the heat exchanger is a front-mounted heat exchanger.
(III) advantageous effects
The utility model provides a beneficial effect is: the utility model provides a heat pump step heating system of thermal power plant's circulating water waste heat recovery, this heat pump step heating system set up through multistage heat pump, heat exchanger and circulating water tank's cooperation, have formed exothermic circulation subsystem and waste heat recovery subsystem. The circulating water flowing through is subjected to heat exchange repeatedly by the heat release circulating subsystem and the waste heat recovery subsystem, and low-grade waste heat in the circulating water is recovered by multiple times of heat exchange, so that the recycling efficiency of the waste heat of the circulating water is improved, and the low-grade waste heat is efficiently converted into high-grade heat energy.
Drawings
Fig. 1 is a schematic view of the overall structure of the heat pump step heating system for recovering the waste heat of the circulating water of the thermal power plant of the present invention;
fig. 2 is the utility model discloses a heat pump step heating system's of thermal power plant's circulating water waste heat recovery's first order heat pump mechanism's internal connection relation sketch map.
[ description of reference ]
1: a heat exchanger; 11: a cold fluid inlet; 12: a cold fluid outlet; 13: a hot fluid inlet; 14: a hot fluid outlet;
2: a first stage heat pump mechanism;
3: a second stage heat pump mechanism;
4: a third stage heat pump mechanism;
5: a circulating water tank;
6: an evaporator; 61: a heating medium inlet; 62: a heating medium outlet;
7: a condenser; 71: a refrigerant inlet; 72: a refrigerant outlet;
8: a compressor;
9: an expansion valve.
Detailed Description
For a better understanding of the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, the utility model provides a heat pump step heating system for recovering the waste heat of the circulating water of the thermal power plant, which comprises a heat exchanger 1, a multi-stage heat pump, a circulating water tank 5 and a connecting pipe; the cold fluid inlet 11 of the heat exchanger 1 introduces desalted water through a connecting pipe, the cold fluid outlet 12 of the heat exchanger 1 is communicated with the heat medium inlet 61 of the multi-stage heat pump, and the heat medium outlet 62 of the multi-stage heat pump is communicated with the inlet of the circulating water tank 5 to form a heat release circulating subsystem; the outlet of the circulating water tank 5 is communicated with a hot fluid inlet 13 of the heat exchanger 1, and a hot fluid outlet 14 of the heat exchanger 1 is communicated with a refrigerant inlet 71 of the multi-stage heat pump to form a waste heat recovery subsystem; the circulating water tank 5 can be communicated with high-temperature circulating water of the cooling tower to increase the water temperature of the desalted water subjected to heat release by the multistage heat pump, and the refrigerant outlet 72 of the multistage heat pump can output the high-temperature desalted water subjected to heat treatment by the multistage heat pump.
In this embodiment, the utility model discloses a multistage heat pump's setting, the circulating water of convection process multistage heat pump carries out multistage low-grade waste heat recovery, replaces the part in the thermal power plant low with the steam extraction, promotes the circulating water through the multistage waste heat recovery of circulating water and becomes high-grade hot water supply and use for the heating station, realizes the heating of big difference in temperature. In the heat pump cascade heat supply system for recycling the waste heat of the circulating water of the thermal power plant, a heat medium inlet 61 of a multi-stage heat pump is communicated with a cold fluid outlet 12 of a heat exchanger 1, a heat medium outlet 62 of the multi-stage heat pump is communicated with an inlet of a circulating water tank 5, a heat release circulating subsystem is formed in the heat pump cascade heat supply system, hot water at 30 ℃ flows into the cold fluid outlet 12 of the heat exchanger 1 in the heat release circulating subsystem, then the hot water enters the multi-stage heat pump for heat release, the temperature of the heat released heat is changed into hot water at 20 ℃ and is output to the circulating water tank 5, and the heat release process is finished; a refrigerant inlet 71 of the multi-stage heat pump is communicated with a hot fluid outlet 14 of the heat exchanger 1, an outlet of the circulating water tank 5 is communicated with a hot fluid inlet 13 of the heat exchanger 1, a waste heat recovery subsystem is formed in the heat pump step heating system, circulating water which is subjected to heat release by the heat release circulating subsystem in the waste heat recovery subsystem is mixed with circulating water in front of a cooling tower in the circulating water tank 5, the circulating water is enabled to be not lower than 35 ℃ before entering the heat exchanger 1, heat absorption is carried out after entering the heat exchanger 1 to obtain circulating water at 30 ℃, the circulating water is communicated with the multi-stage heat pump through the refrigerant inlet 71 of the multi-stage heat pump and is heated through step-by-step heat exchange of the multi-stage heat pump, and high-grade hot water is output to be supplied to a heating station for use. According to the heat pump cascade heating system, the latent heat in the thermal power plant is collected through the heat release circulation subsystem formed by the multistage heat pump and the heat exchanger 1, the collected heat is utilized by the waste heat recovery subsystem formed by the multistage heat pump, low-grade waste heat is changed into high-grade heat to be supplied to the heating station, the energy utilization efficiency of the thermal power plant is improved by utilizing the temperature difference, and the waste of the low-grade heat is avoided.
In a preferred embodiment, the multistage heat pump comprises at least a first stage heat pump mechanism 2, a second stage heat pump mechanism 3 and a third stage heat pump mechanism 4; a refrigerant inlet 71 of the first-stage heat pump mechanism 2 is communicated with a hot fluid outlet 14 of the heat exchanger 1, a refrigerant inlet 71 of the second-stage heat pump mechanism 3 is communicated with a refrigerant outlet 72 of the first-stage heat pump mechanism 2, a refrigerant inlet 71 of the third-stage heat pump mechanism 4 is communicated with a refrigerant outlet 72 of the second-stage heat pump mechanism, and a refrigerant outlet 72 of the third-stage heat pump mechanism 4 is output to the outside; the heat medium inlets 61 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 are all communicated with the cold fluid outlet 12 of the heat exchanger 1, and the heat medium outlets 62 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 are all connected with the inlet of the circulating water tank 5.
In the heat release circulation subsystem formed by the heat pump step heating system, hot water at 30 ℃ flows into a cold fluid outlet 12 of a heat exchanger 1, then enters a first-stage heat pump mechanism 2, a second-stage heat pump mechanism 3 and a third-stage heat pump mechanism 4 in parallel to release heat, the hot water with the temperature of 20 ℃ after heat release is output to a circulation water tank 5 together, and the heat release process is finished; in the waste heat recovery subsystem formed by the heat pump step heating system, circulating water after heat release of the heat release circulating subsystem is mixed with circulating water in front of a cooling tower in a circulating water tank 5, so that the circulating water is not lower than 35 ℃ before entering a heat exchanger 1, and after entering the heat exchanger 1, heat absorption is changed into circulating water at 30 ℃, the circulating water sequentially enters a first-stage heat pump mechanism 2, a second-stage heat pump mechanism 3 and a third-stage heat pump mechanism 4, and after being heated step by the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4, a refrigerant outlet 72 of the third-stage heat pump mechanism 4 outputs high-grade hot water to be supplied to a heating station for use.
Referring to fig. 1, the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3, and the third-stage heat pump mechanism 4 each include an evaporator 6, a condenser 7, a waste heat recovery pipe, and a heat release circulation pipe; the condensers 7 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 are sequentially communicated in series through waste heat recovery pipelines, and the condenser 7 of the first-stage heat pump mechanism is communicated with a hot fluid outlet 14 of the heat exchanger 1 to form a waste heat recovery subsystem; the evaporators 6 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 are connected in parallel through a heat release circulating pipeline, a heat medium inlet 61 of the evaporator 6 is communicated with a cold fluid outlet 12 of the heat exchanger 1 through the heat release circulating pipeline, and a heat medium outlet 62 of the evaporator 6 is communicated with an inlet of the circulating water tank 5 to form a heat release circulating subsystem.
In the embodiment, in the waste heat recovery subsystem, the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the condenser 7 of the third-stage heat pump mechanism 4 are sequentially communicated in series, circulating water as a working medium heated in the heat pump mechanisms sequentially flows through the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4, the circulating water is subjected to heat exchange in the heat exchanger 1 to 30 ℃, then enters the condenser 7 of the first-stage heat pump mechanism 2 to be heated to 45 ℃, then enters the condenser 7 of the second-stage heat pump mechanism 3 to be heated to 55 ℃, and finally enters the condenser 7 of the third-stage heat pump mechanism 4 to be heated to 65 ℃ for output, and the circulating water is supplied to a heating station for use. And in the heat release circulation subsystem, the evaporators 6 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 are connected in parallel through a heat release circulation pipeline, the 20 ℃ demineralized water introduced from the outside through a connecting pipe is heated to 30 ℃ in the heat exchanger 1 and then enters the evaporators 6 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 which are connected in parallel, and the demineralized water at 20 ℃ is output to the circulation water tank 5 after heat exchange through the evaporators 6 of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4. This heat-releasing circulation subsystem is used for heating the circulating water through this multistage heat pump among the waste heat recovery system through the heat recovery of demineralized water in multistage heat pump mechanism to realize the low-grade heat energy's of circulating water recycle repeatedly, improve this heat pump step heating system's energy utilization and rate, avoid the energy waste in the circulating water.
Referring to fig. 2, each of the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3, and the third-stage heat pump mechanism 4 further includes a compressor 8 and an expansion valve 9, and the evaporator 6, the compressor 8, the condenser 7, and the expansion valve 9 are sequentially and cyclically communicated through pipes. The multistage heat pump adopts R134a as a refrigerant to flow in the multistage heat pump, and the demineralized water as a heated working medium flows through the multistage heat pump.
In this embodiment, the evaporators 6 are each provided with a refrigerant inlet and a gas outlet, the condensers 7 are each provided with a gas inlet and a refrigerant outlet, the refrigerant inlet of the evaporator 6 is communicated with the outlet of the expansion valve 9, the gas outlet of the evaporator 6 is communicated with the inlet of the compressor 8, the outlet of the compressor 8 is communicated with the gas inlet of the condenser 7, and the refrigerant outlet of the condenser 7 is communicated with the inlet of the expansion valve 9, so as to form a heat exchange cycle. The refrigerant absorbs heat in the evaporator 6 and is converted into gas, the gas enters the compressor 8 through the gas outlet of the evaporator 6, the gas is pressed into the condenser 7 by the compressor 8, the gas is liquefied in the condenser 7 and is subjected to heat exchange (namely heat release) through the condenser 7, the heat is taken away by circulating water flowing through and is used for heating the circulating water flowing through, the liquid refrigerant is subjected to pressure reduction through the throttling action of the expansion valve 9, the low-pressure liquid refrigerant is gasified in the evaporator 6 and is subjected to heat exchange (namely heat absorption) through the evaporator 6, and the absorbed heat comes from the heat of the circulating water flowing through, so that the repeated absorption and utilization of the heat energy in the circulating water are realized, the low-grade waste heat in the circulating water is recovered, the loss of the heat energy in the circulating water is avoided, and the comprehensive energy efficiency ratio in the heat pump cascade heat supply system is effectively improved.
As shown in figure 1, the multistage heat pumps are all electric drive heat pumps, the electric power of the electric drive heat pumps is 500kW-600kW, and the heating capacity of the electric drive heat pumps is 3.4MW-3.8MW.
In one embodiment, the flow rate of the introduced 20 ℃ demineralized water is 200t/h, the pressure is 0.1Mpa, the 20 ℃ demineralized water is heated to 60-65 ℃, the rated back pressure of the unit is 4.9kpa, the circulating water temperature in the circulating water tank 5 is designed according to 35 ℃ in winter, the first-stage heat pump mechanism 2, the second-stage heat pump mechanism 3 and the third-stage heat pump mechanism 4 are all electric-driven heat pumps, the electric power of each heat pump is 500-600kW, the heating capacity of each heat pump is 3.66MW (3.4-3.8 MW), the heating capacity of the heat pump cascade heating system is 10467kW, the power consumption is 1760kW, and the comprehensive energy efficiency ratio is 5.95. In summer, the back pressure is increased along with the temperature increase, and the comprehensive energy efficiency ratio of the heat pump cascade heating system designed according to the embodiment is higher.
In a preferred embodiment, a pressure pump is provided before the cold fluid inlet 11 of the heat exchanger 1 and before the hot fluid inlet 13 of the heat exchanger 1. A temperature sensor is provided in the circulation water tank 5. The heat exchanger 1 in the system is a front-mounted heat exchanger.
In this embodiment, a temperature sensor in the circulation tank 5 is provided to measure the temperature of the circulating water before it enters the heat exchanger 1 to ensure that the circulating water meets the design water temperature requirement. The specific structure of the front heat exchanger refers to CN200920216963.X, and the front heat exchanger has the advantages of compact structure, convenience in installation, lower cost and higher heat transfer efficiency.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that modifications, alterations, substitutions and variations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. A heat pump cascade heating system for recycling circulating water waste heat of a thermal power plant is characterized by comprising a heat exchanger, a multi-stage heat pump, a circulating water tank and a connecting pipe;
the cold fluid inlet of the heat exchanger introduces desalted water through the connecting pipe, the cold fluid outlet of the heat exchanger is communicated with the hot medium inlet of the multistage heat pump, and the hot medium outlet of the multistage heat pump is communicated with the inlet of the circulating water tank to form a heat release circulating subsystem;
an outlet of the circulating water tank is communicated with a hot fluid inlet of the heat exchanger, and a hot fluid outlet of the heat exchanger is communicated with a refrigerant inlet of the multistage heat pump to form a waste heat recovery subsystem;
the circulating water tank can be communicated with high-temperature circulating water of the cooling tower so as to raise the water temperature of the desalted water subjected to heat release by the multistage heat pump, and a refrigerant outlet of the multistage heat pump can output the high-temperature desalted water treated by the multistage heat pump.
2. The heat pump cascade heat supply system for recovering waste heat of circulating water in a thermal power plant as recited in claim 1, wherein the multistage heat pump comprises at least a first stage heat pump mechanism, a second stage heat pump mechanism and a third stage heat pump mechanism;
a refrigerant inlet of the first-stage heat pump mechanism is communicated with a hot fluid outlet of the heat exchanger, a refrigerant inlet of the second-stage heat pump mechanism is communicated with a refrigerant outlet of the first-stage heat pump mechanism, a refrigerant inlet of the third-stage heat pump mechanism is communicated with a refrigerant outlet of the second-stage heat pump mechanism, and a refrigerant outlet of the third-stage heat pump mechanism is output to the outside;
the heat medium inlet of first order heat pump mechanism, second level heat pump mechanism, third level heat pump mechanism all with the cold fluid outlet of heat exchanger is linked together, the heat medium outlet of first order heat pump mechanism, second level heat pump mechanism, third level heat pump mechanism all with circulation tank's entry links to each other.
3. The heat pump step heating system for recovering the waste heat of the circulating water of the thermal power plant according to claim 2, wherein the first-stage heat pump mechanism, the second-stage heat pump mechanism and the third-stage heat pump mechanism each comprise an evaporator, a condenser, a waste heat recovery pipeline and a heat release circulating pipeline;
the condensers of the first-stage heat pump mechanism, the second-stage heat pump mechanism and the third-stage heat pump mechanism are sequentially communicated in series through the waste heat recovery pipeline, and a refrigerant inlet of the condenser of the first-stage heat pump mechanism is communicated with a hot fluid outlet of the heat exchanger through the waste heat recovery pipeline to form the waste heat recovery subsystem;
first order heat pump mechanism second level heat pump mechanism with third level heat pump mechanism the evaporimeter passes through heat release circulating line is in proper order parallel connection, the heat medium entry of evaporimeter passes through heat release circulating line all with the cold fluid outlet of heat exchanger is linked together, the heat medium export of evaporimeter all with circulation tank's entry is linked together in order to form heat release circulation subsystem.
4. A heat pump step heating system for recovering waste heat of circulating water in a thermal power plant according to claim 3, wherein the first stage heat pump mechanism, the second stage heat pump mechanism and the third stage heat pump mechanism each further comprise a compressor and an expansion valve, and the evaporator, the compressor, the condenser and the expansion valve are sequentially and circularly communicated through a pipeline.
5. The heat pump cascade heating system for recycling waste heat of circulating water in a thermal power plant as recited in any one of claims 1 to 4, wherein the multistage heat pumps are all electrically driven heat pumps, the electric power of the electrically driven heat pumps is 500kW to 600kW, and the heating capacity of the electrically driven heat pumps is 3.4MW to 3.8MW.
6. The heat pump cascade heating system for recovering the waste heat of the circulating water of the thermal power plant according to any one of claims 1 to 4, wherein a pressure pump is arranged in front of a cold fluid inlet of the heat exchanger and in front of a hot fluid inlet of the heat exchanger.
7. The heat pump cascade heating system for recovering the waste heat of the circulating water of the thermal power plant as recited in any one of claims 1 to 4, wherein the multistage heat pumps all use R134a as a refrigerant to flow inside the multistage heat pumps, and demineralized water as a heated working medium flows through the multistage heat pumps.
8. The heat pump cascade heating system for recovering the waste heat of the circulating water of the thermal power plant according to any one of claims 1 to 4, wherein a temperature sensor is arranged in the circulating water tank.
9. The heat pump cascade heating system for recovering the waste heat of the circulating water of the thermal power plant according to any one of claims 1 to 4, wherein the heat exchanger is a front-mounted heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222631872.0U CN218237608U (en) | 2022-10-08 | 2022-10-08 | Heat pump step heating system for recycling waste heat of circulating water of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222631872.0U CN218237608U (en) | 2022-10-08 | 2022-10-08 | Heat pump step heating system for recycling waste heat of circulating water of thermal power plant |
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| CN218237608U true CN218237608U (en) | 2023-01-06 |
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