CN110805886A - Hot water waste heat recovery system using absorption heat pump and method for recovering hot water waste heat - Google Patents
Hot water waste heat recovery system using absorption heat pump and method for recovering hot water waste heat Download PDFInfo
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- CN110805886A CN110805886A CN201911108537.9A CN201911108537A CN110805886A CN 110805886 A CN110805886 A CN 110805886A CN 201911108537 A CN201911108537 A CN 201911108537A CN 110805886 A CN110805886 A CN 110805886A
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- temperature
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- hot water
- heat pump
- waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/08—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
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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
Abstract
A hot water waste heat recovery system utilizing an absorption heat pump comprises a first-type absorption heat pump, a water pump and an expansion machine. A first evaporator waste heat path inlet of the first absorption heat pump is communicated with an exhaust port of the expander, and a first evaporator waste heat path outlet of the first absorption heat pump is communicated with a water inlet of the water pump; an inlet of an absorber heat exchange path of the first absorption heat pump is communicated with a water outlet of the water pump, and an outlet of a condenser heat exchange path of the first absorption heat pump is communicated with an air inlet of the expander; the first-class absorption heat pump is used for recovering the waste heat of the hot water flowing in from the waste heat path inlet of the second evaporator and discharging the hot water after heat exchange from the waste heat path outlet of the second evaporator. The invention also discloses a method for recovering the waste heat of the hot water by using the absorption heat pump, which can recover the waste heat of the medium-pressure medium-temperature hot water, improve the energy utilization rate and reduce the energy consumption.
Description
Technical Field
The invention relates to a waste heat recovery technology.
Background
At present, a plurality of waste heat recovery devices for high-temperature steam exist in the market, but for medium-pressure and medium-temperature (about 0.1MPa and 70 ℃) hot water, an efficient and low-cost energy recovery scheme is always lacked.
Disclosure of Invention
The invention aims to provide a hot water waste heat recovery system utilizing an absorption heat pump, which can recover the waste heat of medium-pressure medium-temperature hot water, improve the energy utilization rate and reduce the energy consumption.
The invention adopts the following technical scheme:
according to one aspect of the invention, a hot water waste heat recovery system using an absorption heat pump is provided, which comprises a first absorption heat pump, a water pump and an expander. The first-class absorption heat pump comprises a first evaporator waste heat path inlet, a first evaporator waste heat path outlet, a second evaporator waste heat path inlet, a second evaporator waste heat path outlet, an absorber heat exchange path inlet and a condenser heat exchange path outlet; a first evaporator waste heat path inlet of the first absorption heat pump is communicated with an exhaust port of the expander, and a first evaporator waste heat path outlet of the first absorption heat pump is communicated with a water inlet of the water pump; an inlet of an absorber heat exchange path of the first absorption heat pump is communicated with a water outlet of the water pump, and an outlet of a condenser heat exchange path of the first absorption heat pump is communicated with an air inlet of the expander; the first-class absorption heat pump is used for recovering the waste heat of the hot water flowing in from the waste heat path inlet of the second evaporator and discharging the hot water after heat exchange from the waste heat path outlet of the second evaporator.
According to another aspect of the invention, a method for recovering hot water waste heat by using an absorption heat pump is provided, which comprises the following steps:
the medium-pressure high-temperature driving steam enters a first-class absorption heat pump to heat a generator of the first-class absorption heat pump;
the medium-pressure medium-temperature hot water with waste heat to be recovered and low-pressure medium-temperature steam discharged by an expansion machine enter an evaporator of a first type of absorption heat pump for heat exchange, the low-pressure medium-temperature steam is changed into low-pressure low-temperature hot water after heat exchange and enters a water pump, and the medium-pressure medium-temperature hot water is changed into medium-pressure low-temperature hot water after heat exchange and is discharged from the first type of absorption heat pump;
inputting high-pressure low-temperature hot water output by a water pump into a first absorption heat pump, and sequentially heating the high-pressure low-temperature hot water by an absorber and a condenser of the first absorption heat pump to obtain high-pressure high-temperature steam;
and inputting the high-temperature and high-pressure steam into the expander to drive the expander to do work.
The invention has at least the following advantages:
in the embodiment of the invention, the first type of absorption heat pump can recover the energy of the gas exhausted after the expander works, and produce high-temperature and high-pressure steam suitable for the air sucked by the expander to drive the expander to work so as to drive a load or generate electricity, thereby playing a role of transmitting the energy from the low-grade pump to the high-grade heat pump. In the process, the waste heat of the medium-pressure and medium-temperature hot water is recycled by the first-type absorption heat pump, so that the consumption of the first-type absorption heat pump on a driving heat source is reduced, and the energy utilization rate is improved.
Drawings
Fig. 1 shows a schematic diagram of a hot water waste heat recovery system using an absorption heat pump according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Please refer to fig. 1. A hot water waste heat recovery system using an absorption heat pump according to an embodiment of the present invention includes a first-type absorption heat pump 1, a water pump 2, and an expander 3.
The first-class absorption heat pump 1 comprises a first evaporator waste heat path inlet 1A, a first evaporator waste heat path outlet 1B, a second evaporator waste heat path inlet 1C, a second evaporator waste heat path outlet 1D, an absorber heat exchange path inlet 1E, a condenser heat exchange path outlet 1F, a driving heat source inlet 1G and a driving heat source outlet 1H.
A first evaporator waste heat path inlet 1A of the first absorption heat pump 1 is communicated with an exhaust port of the expander 3, and a first evaporator waste heat path outlet 1B of the first absorption heat pump is communicated with a water inlet of the water pump 2; an absorber heat exchange path inlet 1E of the first absorption heat pump 1 is communicated with a water outlet of the water pump 2, and a condenser heat exchange path outlet 1F of the first absorption heat pump is communicated with an air inlet of the expander 3; the driving heat source inlet 1G of the first-class absorption heat pump 1 is used for receiving an externally input driving heat source, and the driving heat source after heat exchange in the first-class absorption heat pump 1 is discharged from the driving heat source outlet 1H. The first-type absorption heat pump 1 can recover the waste heat of the hot water flowing in from the waste heat path inlet 1C of the second evaporator, and discharge the hot water after heat exchange from the waste heat path outlet 1D of the second evaporator.
In this embodiment, the first evaporator waste heat path inlet 1A, the first evaporator waste heat path outlet 1B, the second evaporator waste heat path inlet 1C, and the second evaporator waste heat path outlet 1D of the first-type absorption heat pump 1 are all communicated with the same evaporator in the first-type absorption heat pump 1.
Optionally, the expander is a screw expander or a steam turbine.
The method for recovering the waste heat of the hot water by using the absorption heat pump according to the embodiment of the invention comprises the following steps:
the medium-pressure high-temperature driving steam as a driving heat source enters the first-class absorption heat pump 1 to heat a generator of the first-class absorption heat pump;
the medium-pressure medium-temperature hot water with waste heat to be recovered and the low-pressure medium-temperature steam discharged by the expander 3 respectively enter an evaporator of the first absorption heat pump 1 for heat exchange, the low-pressure medium-temperature steam becomes low-pressure low-temperature hot water after heat exchange and enters the water pump 2, and the medium-pressure medium-temperature hot water becomes medium-pressure low-temperature hot water after heat exchange and is discharged from the first absorption heat pump 1;
the high-pressure low-temperature hot water output by the water pump 2 is input into the first type absorption heat pump 1, and is heated by the absorber and the condenser of the first type absorption heat pump 1 in sequence to obtain high-pressure high-temperature steam;
high-temperature and high-pressure steam is input into the expander 3 to drive the expander to do work.
In this embodiment, the temperature of the medium pressure high temperature driving steam is higher than that of the high temperature high pressure steam. The temperature of the low-pressure medium-temperature steam (namely the exhaust temperature of the expander) is equal to the temperature of the medium-pressure medium-temperature hot water for recovering the waste heat, and the pressure of the low-pressure medium-temperature steam (namely the exhaust pressure of the expander) is the saturation pressure at the temperature of the low-pressure medium-temperature steam. The temperature of the high-temperature high-pressure steam (i.e., the intake air temperature of the expander) is a saturation temperature at the pressure of the high-temperature high-pressure steam (i.e., the intake air pressure of the expander). The pressure before the pump of the water pump is the exhaust pressure of the expander, and the pressure after the pump is the suction pressure of the expander.
The principles and operation of the present invention are described below with reference to a specific application implementation. In this application example, 0.27MPa is high pressure, 0.10MPa is medium pressure, and 0.03MPa is low pressure; the temperature is high at 130 ℃, medium at 70 ℃ and low at 40 ℃. The pressure of the medium-pressure high-temperature driving steam is 0.1MPa, and the temperature is 400 ℃; the pressure of the medium-pressure medium-temperature hot water to be recovered with the waste heat is 0.1MPa, and the temperature is 70 ℃; the pressure of the low-pressure medium-temperature steam is 0.03MPa, and the temperature is 70 ℃; the pressure of the low-pressure low-temperature hot water is 0.03MPa, and the temperature is 40 ℃; the pressure of the high-pressure low-temperature hot water is 0.27MPa, and the temperature is 40 ℃; the pressure of the high-pressure high-temperature steam is 0.27MPa, and the temperature is 130 ℃. The expander adopts a double-screw expander.
Please refer to fig. 1. The low-pressure medium-temperature steam discharged by the expansion machine 3 enters a first evaporator waste heat path inlet 1A of the first-class absorption heat pump 1, is cooled into low-pressure low-temperature hot water by refrigerant steam of the evaporator, and is discharged through a first evaporator waste heat path outlet 1B of the first-class absorption heat pump 1. The low-pressure low-temperature hot water is pressurized into high-pressure low-temperature hot water by the water pump 2, then flows into the inlet 1E of the absorber heat exchange path of the first absorption heat pump 1, and is preheated by the absorber. And medium-pressure medium-temperature hot water to be subjected to waste heat recovery is introduced into a second evaporator waste heat path inlet 1C of the first absorption heat pump 1, and is discharged through a second evaporator waste heat path outlet 1D of the first absorption heat pump 1 after heat is recovered. The medium-pressure high-temperature driving steam enters a driving heat source inlet 1G of the first-type absorption heat pump 1 to provide heat for the first-type absorption heat pump 1, and is discharged from a driving heat source outlet 1H of the first-type absorption heat pump 1 after releasing heat. After high-pressure low-temperature hot water is introduced into the first-type absorption heat pump 1, the high-pressure low-temperature hot water is heated by an absorber and a condenser of the first-type absorption heat pump 1 in sequence to obtain high-pressure high-temperature steam, the high-pressure high-temperature steam is discharged from a condenser heat exchange path outlet 1F of the first-type absorption heat pump 1 and enters the expansion machine 3 to drive the expansion machine 3 to do work, a load is driven or a generator is driven to generate electricity, the gas discharged from the expansion machine 3 becomes low-pressure medium-temperature steam, and the low-pressure medium-temperature steam is introduced into the first.
In other embodiments, the medium pressure moderate temperature hot water may have a temperature in excess of 70 ℃. When the intake pressure of the expander 3 is 0.9MPa, the expander 3 preferably employs a multistage steam turbine.
The temperature of the medium-pressure high-temperature driving steam used as a driving heat source is generally 200-400 ℃, the higher the temperature is, the less the consumption is, and the optimal temperature needs to be selected in consideration of the requirements of working conditions and cost.
In the embodiment of the invention, the first type of absorption heat pump can recover the energy of the gas exhausted after the expander works, and produce high-temperature and high-pressure steam suitable for the air sucked by the expander to drive the expander to work so as to drive a load or generate electricity, thereby playing a role of transmitting the energy from the low-grade pump to the high-grade heat pump. In the process, the waste heat of the medium-pressure and medium-temperature hot water is recycled by the first-type absorption heat pump, so that the consumption of the first-type absorption heat pump on a driving heat source is reduced, and the energy utilization rate is improved.
Claims (7)
1. A hot water waste heat recovery system utilizing an absorption heat pump is characterized by comprising a first-type absorption heat pump, a water pump and an expansion machine;
the first-class absorption heat pump comprises a first evaporator waste heat path inlet, a first evaporator waste heat path outlet, a second evaporator waste heat path inlet, a second evaporator waste heat path outlet, an absorber heat exchange path inlet and a condenser heat exchange path outlet;
a first evaporator waste heat path inlet of the first absorption heat pump is communicated with an exhaust port of the expander, and a first evaporator waste heat path outlet of the first absorption heat pump is communicated with a water inlet of the water pump; an absorber heat exchange path inlet of the first absorption heat pump is communicated with a water outlet of the water pump, and a condenser heat exchange path outlet of the first absorption heat pump is communicated with an air inlet of the expander;
the first-type absorption heat pump is used for recovering the waste heat of the hot water flowing from the waste heat path inlet of the second evaporator and discharging the hot water after heat exchange from the waste heat path outlet of the second evaporator.
2. A hot water waste heat recovery system using an absorption heat pump according to claim 1, wherein the expander is a screw expander or a steam turbine.
3. The method for recovering the waste heat of the hot water by using the absorption heat pump is characterized by comprising the following steps of:
the medium-pressure high-temperature driving steam enters a first-type absorption heat pump to heat a generator of the first-type absorption heat pump;
the medium-pressure medium-temperature hot water with waste heat to be recovered and the low-pressure medium-temperature steam discharged by the expansion machine enter an evaporator of the first type of absorption heat pump for heat exchange, the low-pressure medium-temperature steam is changed into low-pressure low-temperature hot water after heat exchange and enters a water pump, and the medium-pressure medium-temperature hot water is changed into medium-pressure low-temperature hot water after heat exchange and is discharged from the first type of absorption heat pump;
the high-pressure low-temperature hot water output by the water pump is input into the first absorption heat pump, and is heated by the absorber and the condenser of the first absorption heat pump in sequence to obtain high-pressure high-temperature steam;
and the high-temperature and high-pressure steam is input into the expansion machine to drive the expansion machine to do work.
4. The method of recovering the residual heat of hot water using an absorption heat pump according to claim 3, wherein the temperature of the medium-pressure high-temperature driving steam is higher than the temperature of the high-temperature high-pressure steam.
5. The method of recovering waste heat of hot water using an absorption heat pump according to claim 3, wherein the temperature of the low pressure mid-temperature steam is equal to the temperature of the mid-pressure mid-temperature hot water from which the waste heat is to be recovered, and the pressure of the low pressure mid-temperature steam is a saturation pressure at the temperature of the low pressure mid-temperature steam.
6. The method of recovering the residual heat of hot water using an absorption heat pump according to claim 3, wherein the temperature of the high temperature and high pressure steam is a saturation temperature at a pressure of the high temperature and high pressure steam.
7. The method of recovering the waste heat of hot water using an absorption heat pump according to claim 3, wherein the pressure of the medium-pressure high-temperature driving steam is 0.1MPa, and the temperature is 400 ℃; the pressure of the medium-pressure medium-temperature hot water is 0.1MPa, and the temperature is 70 ℃; the pressure of the low-pressure medium-temperature steam is 0.03MPa, and the temperature is 70 ℃; the pressure of the low-pressure low-temperature hot water is 0.03MPa, and the temperature is 40 ℃; the pressure of the high-pressure low-temperature hot water is 0.27MPa, and the temperature is 40 ℃; the pressure of the high-pressure high-temperature steam is 0.27MPa, and the temperature is 130 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108537.9A CN110805886A (en) | 2019-11-13 | 2019-11-13 | Hot water waste heat recovery system using absorption heat pump and method for recovering hot water waste heat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911108537.9A CN110805886A (en) | 2019-11-13 | 2019-11-13 | Hot water waste heat recovery system using absorption heat pump and method for recovering hot water waste heat |
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| CN110805886A true CN110805886A (en) | 2020-02-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1766461A (en) * | 2004-10-13 | 2006-05-03 | 株式会社荏原制作所 | Absorption type heat pump |
| CN2929596Y (en) * | 2006-07-17 | 2007-08-01 | 祝建军 | Absorptive heat pump system for recovering waste heat from power plant, printing and dyeing, oil field and pharmaceutical industries |
| CN102828789A (en) * | 2011-06-14 | 2012-12-19 | 同方节能工程技术有限公司 | Low-voltage heating equipment of power plant |
| CN103090357A (en) * | 2011-10-31 | 2013-05-08 | 杭州三花研究院有限公司 | System utilizing absorption heat pump to recover exhaust steam waste heat of power station and heat boiler supply water |
| CN104373166A (en) * | 2014-10-22 | 2015-02-25 | 烟台荏原空调设备有限公司 | Dual-working-medium circulation power generation system having heat dissipating and recycling functions |
| CN105805983A (en) * | 2016-04-20 | 2016-07-27 | 侴乔力 | Boiler compression heat pump and absorption heat pump under step driving of power generator |
-
2019
- 2019-11-13 CN CN201911108537.9A patent/CN110805886A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1766461A (en) * | 2004-10-13 | 2006-05-03 | 株式会社荏原制作所 | Absorption type heat pump |
| CN2929596Y (en) * | 2006-07-17 | 2007-08-01 | 祝建军 | Absorptive heat pump system for recovering waste heat from power plant, printing and dyeing, oil field and pharmaceutical industries |
| CN102828789A (en) * | 2011-06-14 | 2012-12-19 | 同方节能工程技术有限公司 | Low-voltage heating equipment of power plant |
| CN103090357A (en) * | 2011-10-31 | 2013-05-08 | 杭州三花研究院有限公司 | System utilizing absorption heat pump to recover exhaust steam waste heat of power station and heat boiler supply water |
| CN104373166A (en) * | 2014-10-22 | 2015-02-25 | 烟台荏原空调设备有限公司 | Dual-working-medium circulation power generation system having heat dissipating and recycling functions |
| CN105805983A (en) * | 2016-04-20 | 2016-07-27 | 侴乔力 | Boiler compression heat pump and absorption heat pump under step driving of power generator |
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Application publication date: 20200218 |
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| RJ01 | Rejection of invention patent application after publication |