CN210772443U - Device for recovering flue gas waste heat of power plant to drive absorption heat pump to supply heat - Google Patents
Device for recovering flue gas waste heat of power plant to drive absorption heat pump to supply heat Download PDFInfo
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- CN210772443U CN210772443U CN201921407869.2U CN201921407869U CN210772443U CN 210772443 U CN210772443 U CN 210772443U CN 201921407869 U CN201921407869 U CN 201921407869U CN 210772443 U CN210772443 U CN 210772443U
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Abstract
The utility model provides a retrieve device that power plant's flue gas waste heat drove absorption heat pump heat supply, including absorption heat pump unit and packed tower unit, wherein, absorption heat pump unit is used for retrieving the middle temperature flue gas waste heat, and provides the heat source to external heating equipment; the packed tower unit is used for recovering the waste heat of the low-temperature flue gas; the utility model discloses according to the characteristics that preceding stage temperature of flue gas condensation process is high, back stage temperature is low, combine together direct heat transfer and indirect heat transfer, utilize the higher grade heat energy of flue gas as the high temperature heat source of absorption heat pump unit to utilize the lower grade heat energy of packed tower unit recovery flue gas, realize flue gas waste heat's step recycle.
Description
Technical Field
The utility model belongs to the technical field of flue gas waste heat recovery and specifically relates to a retrieve device of power plant's flue gas waste heat drive absorption heat pump heat supply.
Background
At present, natural gas and coal are mainly used as energy sources in the power generation industry, flue gas generated by combustion of the natural gas and the coal contains a large amount of moisture and exists in the form of water vapor, and the water vapor contains a large amount of latent heat of vaporization, so that the recovery of the latent heat in the flue gas generated by combustion of the natural gas and the coal has important significance in energy conservation.
The existing waste heat recovery device mostly adopts the dividing wall type heat exchange, namely, the heat exchange recovery of sensible heat and latent heat is carried out in the dividing wall type heat exchanger, but in the recovery process, the problems of incomplete recovery and low recovery efficiency of the latent heat in the flue gas exist.
The direct heat exchange equipment comprises a spray tower and a packed tower, and because the temperature of the flue gas entering the waste heat recovery device is higher, if the direct heat exchange is carried out by adopting condensate water with lower temperature, the irreversible loss is larger, and the medium-grade heat is wasted.
Disclosure of Invention
An object of the utility model is to provide a retrieve device of power plant's flue gas waste heat drive absorption heat pump heat supply has solved the weak point that current flue gas waste heat recovery exists.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a retrieve device that power plant's flue gas waste heat drove absorption heat pump heat supply, including absorption heat pump unit and packed tower unit, wherein, absorption heat pump unit is used for retrieving the middle temperature flue gas waste heat, and provides the heat source to external heating equipment; and the packed tower unit is used for recovering the waste heat of the low-temperature flue gas.
Preferably, the absorption heat pump unit is provided with a high-temperature heat source inlet, a low-temperature flue gas outlet, a low-temperature heat source inlet, a circulating water outlet, a heat supply circulating water inlet and a heat supply circulating water outlet;
be provided with flue gas entry, circulating water export and circulating water entry on the packed tower unit, wherein:
a high-temperature heat source inlet of the absorption heat pump unit is connected with a medium-temperature flue gas exhaust port of the power plant; the low-temperature flue gas outlet is connected with a flue gas inlet of the packed tower unit;
a low-temperature heat source inlet of the absorption heat pump unit is connected with a circulating water outlet of the packed tower unit;
a circulating water outlet on the absorption heat pump unit is connected with a circulating water inlet on the packed tower unit;
and a heat supply circulating water inlet and a heat supply circulating water outlet on the absorption heat pump unit are connected with external heat supply equipment.
Preferably, the absorption heat pump unit comprises a generator, a condenser, an absorber and an evaporator, wherein:
the generator is provided with a high-temperature heat source inlet which is connected with a medium-temperature flue gas exhaust port of the power plant;
a refrigerant outlet arranged on the generator is connected with a refrigerant inlet arranged on the condenser;
a refrigerant outlet arranged on the condenser is connected with a refrigerant inlet arranged on the evaporator through a throttle valve;
a refrigerant outlet arranged on the evaporator is connected with a refrigerant inlet arranged on the absorber;
a dilute solution outlet arranged on the absorber is connected with a dilute solution inlet arranged on the generator through a circulating pump;
a concentrated solution outlet arranged on the generator is connected with a concentrated solution inlet arranged on the absorber;
a heat supply circulating water outlet arranged on the absorber is connected with a heat supply circulating water inlet arranged on the condenser, and the heat supply circulating water outlet arranged on the condenser is connected with a water supply inlet of external heat supply equipment;
a circulating water inlet arranged on the evaporator is connected with a circulating water outlet of the packed tower unit, and a circulating water outlet arranged on the evaporator is connected with a circulating water inlet arranged on the packed tower unit;
the absorber is provided with a heat supply circulating water inlet which is connected with a return water outlet of external heat supply equipment.
Preferably, the packed tower unit comprises a packed tower body, the packed tower body comprises an outer shell, and the upper part of an inner cavity of the outer shell is provided with packing; the outer side wall of the outer shell is provided with a circulating water inlet, a circulating water outlet and a flue gas inlet, wherein the circulating water inlet is arranged above the filler, and the flue gas inlet is arranged below the filler; the circulating water outlet is arranged below the flue gas inlet; the top of shell body is provided with the exhanst gas outlet.
Preferably, a liquid distributor is further arranged in the inner cavity of the outer shell, is arranged above the filler and is communicated with the circulating water inlet.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a retrieve device of power plant's flue gas waste heat drive absorption heat pump heat supply, according to the characteristics that the preceding stage temperature of flue gas condensation process is high, the later stage temperature is low, combine direct heat transfer and indirect heat transfer, utilize the higher grade heat energy of flue gas as the high temperature heat source of absorption heat pump unit, and utilize the lower grade heat energy of flue gas of packed tower unit recovery, realize the step recycle of flue gas waste heat; meanwhile, the absorption heat pump unit is used for recovering the waste heat of the low-grade flue gas, and the grade of the waste heat of the flue gas is improved, so that external heat supply is realized.
Furthermore, the flue gas is used as a high-temperature heat source of the absorption heat pump unit and a low-temperature heat source of the absorption heat pump unit, and the high-temperature heat source does not need to be found additionally, so that the system is simplified.
Furthermore, the liquid distributor can enable the spraying circulating water to be uniformly distributed.
Drawings
Fig. 1 is a schematic view of the structure of the device according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a device for recovering flue gas waste heat of a power plant to drive an absorption heat pump to supply heat, which comprises an absorption heat pump unit and a packed tower unit, wherein the absorption heat pump unit is used for recovering the medium-temperature flue gas waste heat; and the packed tower unit is used for recovering the waste heat of the low-temperature flue gas.
The absorption heat pump unit is provided with a high-temperature heat source inlet, a low-temperature flue gas outlet, a low-temperature heat source inlet, a circulating water outlet, a heat supply circulating water inlet and a heat supply circulating water outlet;
the packed tower unit is provided with a low-temperature flue gas inlet, a circulating water outlet and a circulating water inlet, wherein a high-temperature heat source inlet of the absorption heat pump unit is connected with a medium-temperature flue gas exhaust port of the power plant; the low-temperature flue gas outlet is connected with a low-temperature flue gas inlet of the packed tower unit; a circulating water inlet of the absorption heat pump unit is connected with a circulating water outlet of the packed tower unit; and a circulating water outlet on the absorption heat pump unit is connected with a circulating water inlet on the packed tower unit.
The absorption heat pump unit is also connected with an external heating device.
The absorption heat pump unit comprises a generator 3, a condenser 13, an absorber 14 and an evaporator 15, wherein the generator 3 is provided with a high-temperature heat source inlet which is connected with a medium-temperature flue gas exhaust port of a power plant; a refrigerant outlet arranged on the generator 3 is connected with a refrigerant inlet arranged on the condenser 13; the refrigerant outlet of the condenser 13 is connected with the refrigerant inlet of the evaporator 15 through a throttle valve 17; a refrigerant outlet provided on the evaporator 15 is connected to a refrigerant inlet provided on the absorber 14; a dilute solution outlet arranged on the absorber 14 is connected with a dilute solution inlet arranged on the generator 3 through a circulating pump 16; a concentrated solution outlet arranged on the generator 3 is connected with a concentrated solution inlet arranged on the absorber 14; a heat supply circulating water outlet arranged on the absorber 14 is connected with a heat supply circulating water inlet arranged on the condenser 13, and the heat supply circulating water outlet arranged on the condenser 13 is connected with a water supply inlet of external heat supply equipment; a circulating water inlet arranged on the evaporator 15 is connected with a circulating water outlet of the packed tower unit; a circulating water outlet arranged on the evaporator 15 is connected with a circulating water inlet arranged on the packed tower unit; the absorber 14 is provided with a heat supply circulating water inlet which is connected with a return water outlet of external heat supply equipment.
The packed tower unit comprises a packed tower body, the packed tower body comprises an outer shell 1, the upper part of the inner cavity of the outer shell 1 is provided with a liquid distributor 9 and a packing 8, and the liquid distributor 9 is arranged above the packing 8.
The outer side wall of the outer shell 1 is provided with a circulating water inlet 2, a circulating water outlet 4 and a flue gas inlet 7, wherein the circulating water inlet 2 is communicated with a liquid distributor 9, and the flue gas inlet 7 is arranged below a filler 8; the circulating water outlet 4 is arranged below the flue gas inlet 7.
The top of the outer shell 1 is provided with a flue gas outlet 11.
The outer shell 1 is also provided with a manhole 10, and the manhole 10 is arranged above the liquid distributor 9.
Wherein, the smoke outlet of the generator 3 is connected with the smoke inlet 7 of the packed tower unit, the circulating water outlet 4 of the packed tower unit is connected with the circulating water inlet of the evaporator 15, and the circulating water outlet of the evaporator 15 is connected with the circulating water inlet 2 of the packed tower unit.
The utility model discloses a theory of operation:
the flue gas firstly enters a generator 3 for primary heat exchange and is used as a high-temperature heat source of an absorption heat pump to heat the dilute solution; then enters the outer shell of the packed tower body from the lower part, and carries out secondary heat exchange with circulating water entering the outer shell of the packed tower body, so as to recover the waste heat of low-temperature flue gas; circulating water after absorbing heat enters from a circulating water inlet on the evaporator 15 as a low-temperature heat source of the absorption heat pump, so that the grade of low-temperature flue gas is improved, and heat is supplied to the outside through the circulating water.
The working medium in the absorption heat pump unit comprises a refrigerant and an absorbent solution for absorbing and desorbing the refrigerant, and the refrigerant and the absorbent solution form a working medium pair; the medium-temperature flue gas is used for heating a solution with certain concentration, which is conveyed from the absorber 14 by the circulating pump 16, in the generator 3, and most of low-boiling-point refrigerant in the solution is evaporated; refrigerant steam enters the condenser 13 to heat the heat supply circulating water to a heat supply temperature, and meanwhile, the refrigerant is condensed into refrigerant liquid by a cooling medium and is reduced in pressure to an evaporation pressure through the throttle valve 17; the refrigerant enters the evaporator 15 through throttling, absorbs the heat of the circulating water from the packed tower to be activated into refrigerant steam under the evaporating pressure, and meanwhile, the circulating water from the packed tower is cooled and then is sent back to the packed tower; the concentrated solution remained in the generator 3 in the generation process is reduced to evaporation pressure through a throttle valve 17, enters an absorber 14, is mixed with low-pressure refrigerant steam from an evaporator 15, absorbs the low-pressure refrigerant steam and recovers to the original concentration; the absorption process is a heat release process, and heating circulating water is supplied with heat; the solution with the concentration restored in the absorber 14 is pressurized by the circulation pump 16 and then sent to the generator 3 to continue circulation.
The utility model has the advantages of it is following:
1. the utility model provides a retrieve device and system of power plant's flue gas waste heat drive absorption heat pump heat supply according to the characteristics that preceding stage temperature of flue gas condensation process is high, back stage temperature is low, combines together direct heat transfer and indirect heat transfer, utilizes the higher grade heat energy of flue gas as the high temperature heat source of absorption heat pump to utilize the lower grade heat energy of flue gas of packed tower recovery, realize the step recycle of flue gas waste heat.
2. The utility model provides a retrieve device and system of power plant's flue gas waste heat drive absorption heat pump heat supply, the flue gas both had been regarded as the high temperature heat source of absorption heat pump, also regarded as the low temperature heat source of absorption heat pump, need not look for the high temperature heat source in addition, has simplified the system.
3. The utility model provides a retrieve device and system of power plant's flue gas waste heat drive absorption heat pump heat supply utilizes the absorption heat pump to retrieve low-grade flue gas waste heat, promotes flue gas waste heat grade to realize external heat supply.
Claims (4)
1. A device for driving an absorption heat pump to supply heat by recovering flue gas waste heat of a power plant is characterized by comprising an absorption heat pump unit and a packed tower unit, wherein the absorption heat pump unit is used for recovering medium-temperature flue gas waste heat and providing a heat source for external heat supply equipment; the packed tower unit is used for recovering the waste heat of the low-temperature flue gas;
the absorption heat pump unit is provided with a high-temperature heat source inlet, a low-temperature flue gas outlet, a low-temperature heat source inlet, a circulating water outlet, a heat supply circulating water inlet and a heat supply circulating water outlet;
be provided with flue gas entry, circulating water export and circulating water entry on the packed tower unit, wherein:
a high-temperature heat source inlet of the absorption heat pump unit is connected with a medium-temperature flue gas exhaust port of the power plant; the low-temperature flue gas outlet is connected with a flue gas inlet of the packed tower unit;
a low-temperature heat source inlet of the absorption heat pump unit is connected with a circulating water outlet of the packed tower unit;
a circulating water outlet on the absorption heat pump unit is connected with a circulating water inlet on the packed tower unit;
and a heat supply circulating water inlet and a heat supply circulating water outlet on the absorption heat pump unit are connected with external heat supply equipment.
2. The device for recovering the residual heat of the flue gas of the power plant to drive the absorption heat pump to supply heat according to the claim 1, wherein the absorption heat pump unit comprises a generator (3), a condenser (13), an absorber (14) and an evaporator (15), wherein:
a high-temperature heat source inlet is arranged on the generator (3), and the high-temperature heat source inlet is connected with a medium-temperature flue gas exhaust port of a power plant;
a refrigerant outlet arranged on the generator (3) is connected with a refrigerant inlet arranged on the condenser (13);
a refrigerant outlet arranged on the condenser (13) is connected with a refrigerant inlet arranged on the evaporator (15) through a throttle valve (17);
a refrigerant outlet arranged on the evaporator (15) is connected with a refrigerant inlet arranged on the absorber (14);
a dilute solution outlet arranged on the absorber (14) is connected with a dilute solution inlet arranged on the generator (3) through a circulating pump (16);
a concentrated solution outlet arranged on the generator (3) is connected with a concentrated solution inlet arranged on the absorber (14);
a heat supply circulating water outlet arranged on the absorber (14) is connected with a heat supply circulating water inlet arranged on the condenser (13), and the heat supply circulating water outlet arranged on the condenser (13) is connected with a water supply inlet of external heat supply equipment;
a circulating water inlet arranged on the evaporator (15) is connected with a circulating water outlet of the packed tower unit, and a circulating water outlet arranged on the evaporator (15) is connected with a circulating water inlet arranged on the packed tower unit;
the absorber (14) is provided with a heat supply circulating water inlet which is connected with a return water outlet of external heat supply equipment.
3. The device for recovering the flue gas waste heat of the power plant to drive the absorption heat pump to supply heat according to the claim 1, characterized in that the packed tower unit comprises a packed tower body, the packed tower body comprises an outer shell (1), and a filler (8) is arranged at the upper part of the inner cavity of the outer shell (1); the outer side wall of the outer shell (1) is provided with a circulating water inlet (2), a circulating water outlet (4) and a flue gas inlet (7), wherein the circulating water inlet (2) is arranged above the filler (8), and the flue gas inlet (7) is arranged below the filler (8); the circulating water outlet (4) is arranged below the flue gas inlet (7); the top of the outer shell (1) is provided with a smoke outlet (11).
4. The device for recovering the flue gas waste heat of the power plant to drive the absorption heat pump to supply heat according to claim 3, wherein a liquid distributor (9) is further arranged in the inner cavity of the outer shell (1), and the liquid distributor (9) is arranged above the filler (8) and is communicated with the circulating water inlet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921407869.2U CN210772443U (en) | 2019-08-27 | 2019-08-27 | Device for recovering flue gas waste heat of power plant to drive absorption heat pump to supply heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921407869.2U CN210772443U (en) | 2019-08-27 | 2019-08-27 | Device for recovering flue gas waste heat of power plant to drive absorption heat pump to supply heat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210772443U true CN210772443U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921407869.2U Active CN210772443U (en) | 2019-08-27 | 2019-08-27 | Device for recovering flue gas waste heat of power plant to drive absorption heat pump to supply heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210772443U (en) |
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2019
- 2019-08-27 CN CN201921407869.2U patent/CN210772443U/en active Active
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