CN219014677U - Low-temperature water source heat pump - Google Patents
Low-temperature water source heat pump Download PDFInfo
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- CN219014677U CN219014677U CN202223504611.9U CN202223504611U CN219014677U CN 219014677 U CN219014677 U CN 219014677U CN 202223504611 U CN202223504611 U CN 202223504611U CN 219014677 U CN219014677 U CN 219014677U
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Abstract
The utility model relates to the technical field of waste heat recovery, in particular to a low-temperature water source heat pump, which comprises: the device comprises a generator, a condenser, an absorber, an evaporative condenser, a compressor, a throttle valve and an evaporator; the shell side of the generator, the condenser, the absorber and the evaporative condenser form an absorption heat pump internal circulation; the tube side of the evaporative condenser, the throttle valve, the evaporator and the compressor form compression heat pump internal circulation; the tube side of the generator is connected with an external steam pipeline, the tube side of the evaporator is connected with an external heat source pipeline, the tube side of the absorber and the tube side of the condenser are connected in series, the absorber is connected with a hot water inlet, and the condenser is connected with a hot water outlet. The low-temperature water source heat pump can optimize heat pump parameters, reduce manufacturing cost and simultaneously reduce operation cost.
Description
Technical Field
The utility model relates to the technical field of waste heat recovery, in particular to a low-temperature water source heat pump.
Background
With the enhancement of the energy-saving concept, the heat recovery to the low-temperature waste heat is more and more emphasized. In the field of heat supply, waste heat recovery has been extended to low temperature heat sources such as groundwater, sewage, etc. The underground water and sewage in winter have lower temperature, and the temperature difference required to be lifted is large when the water comes from the heat supply network water with the temperature of about 50 ℃ relative to the backwater temperature below 10 ℃. In this case the conventional heat pump is not implemented and a specific heat pump is required. One way is to use a compression heat pump, and utilize a high compression ratio compressor and a proper working medium to raise the waste heat below 10 ℃ to above 50 ℃; in another mode, a large temperature rise type absorption heat pump is adopted in the occasion with a heat supply source, so that a large temperature rise effect is realized.
The compression heat pump has the defects of large temperature difference, low COP of the heat pump and high power consumption, and particularly for the projects with larger waste heat quantity, such as waste heat recovery of a sewage plant, the waste heat recovery quantity is at least more than 10MW, the power consumption can reach more than 3000kW, on one hand, the operation cost is very high, and on the other hand, the investment of electric capacity expansion is very high.
The disadvantage of using an absorption heat pump is the high investment. The single-stage absorption heat pump can not directly raise the heat below 10 ℃ to the water temperature of a heat supply network, and a two-stage structure is needed. The first stage recovers the waste heat at 10 ℃ to generate intermediate water at an intermediate temperature; and the second stage takes the intermediate water as waste heat and increases the heat to the temperature of the water in the heat supply network. Because the COP of the absorption heat pump is low, the heat quantity of intermediate water produced by the first stage is large, so that the capacity of the second stage absorption heat pump is greatly increased, and the overall cost is increased (if a double-effect machine is adopted, the COP is calculated according to 2.2, 1MW waste heat is recovered, the first stage produces 1.8MW intermediate water, and the second stage needs to adopt equipment with waste heat recovery quantity of 1.8MW, so that the investment is high).
The absorption heat pump has the advantages of low running cost, and the utilization of a heat supply high-temperature heat source to drive and heat the water in the heat supply network is equivalent to zero energy consumption and waste heat recovery. If the heat supply source adopts steam heating, the price of the steam is the price of external heat supply, the steam is used for driving the absorption heat pump, and the steam heat finally enters the heat supply network, so that the operation cost of waste heat recovery is extremely low compared with that of the original heat supply system. In contrast, if a compression heat pump is used, the electricity consumption is low, but the electricity price is high, and 1GJ heat corresponds to 277kWh of electricity, and even at a price of 0.5 yuan/kWh, the driving electricity amount corresponding to 1GJ is 138.5 yuan. The driving electric energy is finally converted into heat energy and sent to a heat supply network, and if sold according to the heat price of 30 yuan/GJ, the driving electric energy is equivalent to 108.5 yuan/GJ of loss. Therefore, the operation cost of the compression heat pump is high. On the premise of heat supply source (such as steam, fuel gas and the like for heat supply), the absorption heat pump should be preferentially used.
The compressor absorber series flow combining the advantages of the two is also provided, the compression heat pump is utilized to replace the first-stage absorption heat pump, at the moment, the lifting temperature difference of the compression heat pump is small, the COP is very high, more than 9 can be achieved, namely, 1MW waste heat is recovered, only 125kW of electric quantity is consumed, 1.125MW heat is generated, the waste heat recovery amount of the second-stage absorption heat pump is 1.125MW, the manufacturing cost is greatly reduced, and meanwhile, the total electric quantity is reduced, which is equivalent to the advantages of combining the two. However, in the series flow, the compression heat pump condenser and the absorption heat pump evaporator are required to be connected by using intermediate water, on one hand, two heat exchanges are required, the heat exchange temperature difference is increased, the operation parameters of the absorption heat pump are deteriorated, and the heat pump cost is increased; on the other hand, the medium water flow is large, the pipeline coarse pump consumption is large, and the investment and the operation cost are increased.
Disclosure of Invention
The utility model aims to provide a low-temperature water source heat pump which can optimize heat pump parameters, reduce manufacturing cost and reduce operation cost.
The utility model provides a low-temperature water source heat pump, which comprises: the device comprises a generator, a condenser, an absorber, an evaporative condenser, a compressor, a throttle valve and an evaporator; the shell side of the generator, the condenser, the absorber and the evaporative condenser form an absorption heat pump internal circulation; the tube side of the evaporative condenser, the throttle valve, the evaporator and the compressor form compression heat pump internal circulation; the tube side of the generator is connected with an external steam pipeline, the tube side of the evaporator is connected with an external heat source pipeline, the tube side of the absorber and the tube side of the condenser are connected in series, the absorber is connected with a hot water inlet, and the condenser is connected with a hot water outlet.
Preferably, the internal circulation of the absorption heat pump is filled with lithium bromide aqueous solution.
Preferably, the compression heat pump internal circulation is filled with compression heat pump refrigerant.
Preferably, a steam inlet and a condensate outlet are arranged on the tube side of the generator.
Preferably, the tube side of the evaporator has a heat source water inlet and a heat source water outlet.
Preferably, the tube side of the absorber is provided with a hot water inlet.
Preferably, the tube side of the condenser is provided with a hot water outlet.
Preferably, the compressor is connected to an electric motor.
Preferably, the compressor is connected to a steam turbine.
Preferably, the compressor is connected to an electric motor, the electric motor is connected to an electric generator, and the electric generator is connected to a steam turbine.
The beneficial effects are that:
the technical scheme of the utility model combines the advantages of the absorption heat pump and the compression heat pump in low-temperature waste heat recovery, avoids the defects, reduces the manufacturing cost compared with the absorption heat pump, and reduces the operation cost compared with the compression heat pump; compared with a series flow of a compression heat pump and an absorption heat pump, the integrated design is realized, the intermediate heat exchange link is reduced, and the investment of internal circulation is reduced; the heat exchange temperature difference is reduced, the operation parameters are improved, and the investment of the absorption heat pump is reduced; the circulating pump is eliminated, and the running power consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a low-temperature water source heat pump according to a first embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a low-temperature water source heat pump according to a second embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a low-temperature water source heat pump according to a third embodiment of the present utility model;
reference numerals illustrate: 1: a generator; 2: a condenser; 3: an absorber; 4: an evaporative condenser; 5: a compressor; 6: a throttle valve; 7: an evaporator; 8: a steam inlet; 9: a condensate outlet; 10: a heat source water inlet; 11: a heat source water outlet; 12: a hot water inlet; 13: a hot water outlet; 14: a motor; 15: a steam turbine; 16: and (5) a generator.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
The present embodiment provides a low-temperature water source heat pump, including: a generator 1, a condenser 2, an absorber 3, an evaporative condenser 4, a compressor 5, a throttle valve 6 and an evaporator 7; the shell side of the generator 1, the condenser 2, the absorber 3 and the evaporative condenser 4 form an absorption heat pump internal circulation; the tube side of the evaporation condenser 4, the throttle valve 6, the evaporator 7 and the compressor 5 form the internal circulation of the compression heat pump; the tube side of the generator 1 is connected with an external steam pipeline, the tube side of the evaporator 7 is connected with an external heat source pipeline, the absorber 3 is connected with the tube side of the condenser 2 in series, the absorber 3 is connected with a hot water inlet 12, and the condenser 2 is connected with a hot water outlet 13.
In this embodiment, the internal circulation of the absorption heat pump is filled with an aqueous lithium bromide solution.
In this embodiment, the compression heat pump refrigerant is filled in the internal cycle of the compression heat pump.
In this embodiment, the tube side of the generator 1 is provided with a steam inlet 8 and a condensate outlet 9.
In the present embodiment, the tube side of the evaporator 7 has a heat source water inlet 10 and a heat source water outlet 11.
In this embodiment, the tube side of the absorber 3 has a hot water inlet 12.
In this embodiment, the tube side of the condenser 2 has a hot water outlet 13.
In this embodiment, the compressor 5 is connected to the motor 14.
In summary, the low-temperature water source heat pump provided in this embodiment is driven by the combination of steam and electric power, and is composed of a generator 1, a condenser 2, an absorber 3, an evaporation condenser 4, a compressor 5, a throttle valve 6, an evaporator 7 and necessary accessories. The shell side of the generator 1, the condenser 2, the absorber 3 and the evaporation condenser 4 form the internal circulation of the absorption heat pump, other equipment required by the absorption heat pump is not shown, and the lithium bromide aqueous solution is filled in the absorption heat pump; the tube side of the evaporative condenser 4, the throttle valve 6, the evaporator 7 and the compressor 5 form an internal circulation of the compression heat pump, and other components required by the compression heat pump are not shown, and the compression heat pump refrigerant is filled in the internal circulation. The tube side of the generator 1 is connected with an external steam pipeline, the tube side of the evaporator 7 is connected with an external heat source pipeline, the tube side of the absorber 3 and the tube side of the condenser 2 are connected in series, the absorber 3 is connected with a hot water inlet 12, and the condenser 2 is connected with a hot water outlet 13. The compressor 5 electrically drives the motor 14
Driving.
The embodiment avoids the defects by combining the advantages of the absorption heat pump and the compression heat pump in low-temperature waste heat recovery, reduces the manufacturing cost compared with the absorption heat pump, and reduces the operation cost compared with the compression heat pump; compared with a series flow of a compression heat pump and an absorption heat pump, the integrated design is realized, the intermediate heat exchange link is reduced, and the investment of internal circulation is reduced; the heat exchange temperature difference is reduced, the operation parameters are improved, and the investment of the absorption heat pump is reduced; the circulating pump is eliminated, and the running power consumption is reduced.
Example two
The present embodiment includes the technical content disclosed in the first embodiment, and the technical content that is the same as that of the first embodiment is not repeated.
In this embodiment, the compressor 5 is connected to a steam turbine 15.
When the low-temperature water source heat pump provided in the first embodiment is higher in steam pressure, the heat pump generator 1 is directly driven to have waste, the absorption heat pump can generate the same effect under lower pressure, and if the steam pressure is too high, a temperature and pressure reducer is also required to be installed to reduce the steam pressure and then enter the generator 1. In this case, the external power input is canceled, and the high-pressure steam drive is entirely adopted.
The compressor 5 in the equipment is driven by a motor 14 to be changed into a steam turbine 15, steam firstly enters the steam turbine 15 to drive the steam turbine 15 to rotate, and the steam turbine 15 drives the compressor 5 to rotate; the depressurized steam enters the generator 1 to be driven. The other flow is the same as in the first embodiment.
Example III
The present embodiment includes technical contents disclosed in the first to second embodiments, and the technical contents of the present embodiment that are the same as those of the first to second embodiments are not repeated.
In this embodiment, the compressor 5 is connected to the motor 14, the motor 14 is connected to the generator 16, and the generator 16 is connected to the steam turbine 15.
The present embodiment is applied to a high pressure steam environment as in the second embodiment. The high-pressure steam firstly enters the steam turbine 15 to drive the generator 16 to rotate, the generated electric energy drives the motor 14, and the motor 14 drives the compressor 5 to rotate. The other flow is the same as in the first embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A low temperature water source heat pump, comprising: the device comprises a generator, a condenser, an absorber, an evaporative condenser, a compressor, a throttle valve and an evaporator; the shell side of the generator, the condenser, the absorber and the evaporative condenser form an absorption heat pump internal circulation; the tube side of the evaporative condenser, the throttle valve, the evaporator and the compressor form compression heat pump internal circulation; the tube side of the generator is connected with an external steam pipeline, the tube side of the evaporator is connected with an external heat source pipeline, the tube side of the absorber and the tube side of the condenser are connected in series, the absorber is connected with a hot water inlet, and the condenser is connected with a hot water outlet.
2. The low temperature water source heat pump of claim 1, wherein the absorption heat pump internal circuit is filled with an aqueous lithium bromide solution.
3. The low temperature water source heat pump of claim 1, wherein the compression heat pump internal circuit is filled with compression heat pump refrigerant.
4. The low temperature water source heat pump of claim 1, wherein a tube side of the generator is provided with a steam inlet and a condensate outlet.
5. The low temperature water source heat pump of claim 1, wherein the tube side of the evaporator has a heat source water inlet and a heat source water outlet.
6. The low temperature water source heat pump of claim 1 wherein the absorber tube side has a hot water inlet.
7. The low temperature water source heat pump of claim 1 wherein the condenser tube side has a hot water outlet.
8. The low temperature water source heat pump of claim 1 wherein the compressor is connected to an electric motor.
9. The low temperature water source heat pump of claim 1, wherein the compressor is coupled to a steam turbine.
10. The low temperature water source heat pump of claim 1, wherein the compressor is connected to an electric motor, the electric motor is connected to a generator, and the generator is connected to a steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223504611.9U CN219014677U (en) | 2022-12-27 | 2022-12-27 | Low-temperature water source heat pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223504611.9U CN219014677U (en) | 2022-12-27 | 2022-12-27 | Low-temperature water source heat pump |
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| Publication Number | Publication Date |
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| CN219014677U true CN219014677U (en) | 2023-05-12 |
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| CN202223504611.9U Active CN219014677U (en) | 2022-12-27 | 2022-12-27 | Low-temperature water source heat pump |
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- 2022-12-27 CN CN202223504611.9U patent/CN219014677U/en active Active
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