CN111156733B - Biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system - Google Patents
Biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system Download PDFInfo
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- CN111156733B CN111156733B CN202010040638.3A CN202010040638A CN111156733B CN 111156733 B CN111156733 B CN 111156733B CN 202010040638 A CN202010040638 A CN 202010040638A CN 111156733 B CN111156733 B CN 111156733B
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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
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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
- F25B30/04—Heat pumps of the sorption type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system, and belongs to the technical field of waste heat recovery. The system comprises a two-stage absorption heat pump unit, a warming absorption heat pump unit, a compression heat pump unit, a first flue gas heat exchange unit, a second flue gas heat exchange unit and a third flue gas heat exchange unit; the second evaporator of the compression heat pump unit is coupled with the third condenser of the warming absorption heat pump unit to form a warming absorption-compression coupling heat pump module; the biomass flue gas sequentially passes through the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit, and the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit are respectively connected with the two-stage absorption heat pump unit, the second condenser of the warming absorption-compression coupling heat pump module and the warming absorption heat pump unit; the system can reduce the temperature of the flue gas from 145 ℃ to below 40 ℃, and the temperature of heating hot water is increased from 45 ℃ to above 70 ℃, so that gradient utilization of the waste heat of the flue gas is realized, and the problem of white feather of the flue gas is solved.
Description
Technical Field
The invention relates to the technical field of waste heat recovery, in particular to a biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system.
Background
In recent years, biomass boilers are gradually replacing coal-fired boilers by virtue of their characteristics of environmental protection, energy saving, and renewable biomass energy. However, the treatment level of the coal economizer and the air preheater at the tail part of the biomass boiler to the flue gas is limited, the moisture content of the flue gas after desulfurization is higher, the exhaust temperature is higher (50-55 ℃), if the flue gas is not treated, the flue gas can be rapidly condensed after being discharged into the atmosphere, the flue gas can exchange mass with the atmosphere, atomization can also occur to form water drops, white smoke can be generated in the daytime, the white smoke can further cause visual pollution to the periphery, chimney corrosion can be caused, a large amount of latent heat of vaporization can be taken away, and waste of heat can be caused.
The utilization of the waste heat of the flue gas is one of effective ways for improving the efficiency of the boiler. At present, the waste heat utilization by adopting the absorption heat pump technology has better energy-saving, environmental-friendly and economic benefits, and although the two-stage absorption heat pump has the advantages of stable operation, capability of absorbing high-grade heat energy as a driving heat source, heating hot water to more than 50 ℃ and the like, the exhaust gas temperature is higher. The heating heat pump uses low-grade heat energy as a heat source and can heat heating hot water to 60 ℃. With the increasing importance of energy conservation, emission reduction and environmental protection requirements of countries in the world, the single double-stage absorption heat pump and the single temperature-raising heat pump are not suitable for the following situations: the exhaust temperature of the flue gas is required to be lower (for example, lower than 45 ℃), and the temperature of the heating hot water is required to be higher (for example, higher than 65 ℃). Therefore, how to provide a waste heat recovery system which can not only fully utilize the waste heat of the flue gas, but also reduce the temperature of the discharged flue gas is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system which can realize the cascade utilization of flue gas energy recovery, reasonably and fully utilize a large amount of flue gas waste heat and fully exert the high efficiency of a waste heat recovery heat pump system.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system which comprises a two-stage absorption heat pump unit, a heating absorption heat pump unit, a compression heat pump unit, a first flue gas heat exchange unit, a second flue gas heat exchange unit and a third flue gas heat exchange unit, wherein the heating absorption heat pump unit is used for heating the biomass flue gas; the biomass flue gas sequentially passes through the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit; the double-stage absorption heat pump unit is positioned on one side of the first flue gas heat exchange unit, a first generator, a second generator and a first condenser which are sequentially connected are arranged at the upper end in the double-stage absorption heat pump unit, a first evaporator, a first absorber and a second absorber which are sequentially connected are arranged at the lower end in the double-stage absorption heat pump unit, the first generator is communicated with the first condenser, the second generator is communicated with the second absorber, and a first spray disc, a second spray disc, a third spray disc, a fourth spray disc and a fifth spray disc are respectively arranged in the second absorber, the first generator, the first absorber, the second generator and the first evaporator; a first heat exchanger is arranged on the outer side of the two-stage absorption heat pump unit, a second heat exchanger is arranged in the first absorber, a first solution pump is arranged below the second absorber, and a second solution pump is arranged below the first absorber; the compression heat pump unit is provided with a second evaporator, the warming absorption heat pump unit is provided with a third condenser which is coupled to form a warming absorption-compression coupling heat pump module, the warming absorption-compression coupling heat pump module further comprises a third evaporator, a third absorber, a third generator, a second condenser, a third condenser and a compressor which are all arranged in the warming absorption heat pump unit, the third evaporator is communicated with the third absorber, the third generator is communicated with the third condenser, a second evaporator is arranged in the third condenser, the top of the second condenser is connected with the second evaporator through the compressor, the bottom of the second condenser is connected with the second evaporator through a throttle valve, a third heat exchanger and a third solution pump connected with the third heat exchanger are arranged below the third generator, a refrigerant pump is arranged below the third condenser, and a sixth spray tray communicated with the third heat exchanger, a seventh spray tray communicated with the third spray pump and an eighth spray tray are respectively arranged in the third evaporator;
the temperature-rising absorption-compression coupling heat pump module is positioned on one side of the third flue gas heat exchange unit, and the two-stage absorption heat pump unit is positioned above the temperature-rising absorption-compression coupling heat pump module; the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit are respectively connected with the two-stage absorption heat pump unit, the second condenser and the temperature-rise absorption heat pump unit.
Optionally, the first flue gas heat exchange unit comprises a first flue gas heat exchanger, the second flue gas heat exchange unit comprises a second flue gas heat exchanger, the third flue gas heat exchange unit comprises a third flue gas heat exchanger, and the first flue gas heat exchanger, the second flue gas heat exchanger and the third flue gas heat exchanger are sequentially communicated from top to bottom.
Optionally, the system also comprises a heating hot water channel C and a heating hot water channel D; the heating hot water passage C comprises a heating hot water inlet pipe, the third absorber, the first absorber, the second absorber, the first condenser and a heating hot water outlet pipe which are sequentially communicated; the heating hot water passage D comprises a heating hot water inlet pipe, a second condenser, a second flue gas heat exchanger and a heating hot water outlet pipe which are connected in sequence.
Optionally, the solution circulation loop E further includes a solution circulation loop E, the solution circulation loop E includes the first generator, the second absorber, the first heat exchanger, the first solution pump, the first spray tray and the second spray tray, a concentrated solution pipe orifice of the first generator and the first spray tray are respectively communicated with two concentrated solution pipe orifices of the first heat exchanger, the first solution pump and the second spray tray are respectively communicated with two dilute solution pipe orifices of the first heat exchanger, and the first solution pump is simultaneously communicated with the dilute solution pipe orifice of the second absorber.
Optionally, the system further comprises a solution circulation loop F, wherein the solution circulation loop F comprises the second generator, the first absorber, the second heat exchanger, the third spray tray, the second solution pump and the fourth spray tray, a concentrated solution pipe orifice of the second generator and the third spray tray are respectively communicated with two concentrated solution pipe orifices of the second heat exchanger, the second solution pump and the fourth spray tray are respectively communicated with two dilute solution pipe orifices of the second heat exchanger, and the second solution pump is simultaneously communicated with the dilute solution pipe orifice of the first absorber.
Optionally, the system further includes a solution circulation loop G, where the solution circulation loop G includes the third generator, the third absorber, the third heat exchanger, the third solution pump, the sixth spray tray and the seventh spray tray, dilute solution nozzles of the sixth spray tray and the third absorber are respectively communicated with two dilute solution nozzles of the third heat exchanger, a concentrated solution nozzle of the third generator and the third solution pump are respectively communicated with two concentrated solution nozzles of the third heat exchanger, and the third solution pump is simultaneously communicated with the seventh spray tray.
Optionally, the refrigeration system further comprises a refrigerant circulation loop H, the refrigerant circulation loop H includes the second evaporator, the compressor, the second condenser and the throttle valve, two ends of the compressor are respectively communicated with a refrigerant pipe orifice of the second evaporator and a refrigerant pipe orifice of the second condenser, and another refrigerant pipe orifice of the second condenser and another refrigerant pipe orifice of the second evaporator are respectively communicated with two ends of the throttle valve.
Optionally, the system further includes a refrigerant circulation circuit J, the refrigerant circulation circuit J includes the first generator, the second generator, the first condenser, the first evaporator, the first absorber, the second absorber, the first heat exchanger, the second heat exchanger, the first solution pump, the second spray tray, the fourth spray tray, and the fifth spray tray, the first generator is communicated with the first condenser, a refrigerant pipe orifice of the first condenser is communicated with the fifth spray tray, the first evaporator is communicated with the first absorber, the second solution pump and the fourth spray tray are respectively communicated with two dilute solution pipe orifices of the second heat exchanger, the second solution pump is simultaneously communicated with a dilute solution pipe orifice of the first absorber, the second generator is communicated with the second absorber, the first solution pump and the second spray tray are respectively communicated with two dilute solution pipe orifices of the first heat exchanger, and the first solution pump is simultaneously communicated with a dilute solution pipe orifice of the second absorber.
Optionally, the refrigerant circulation circuit K further includes a refrigerant circulation circuit K, the refrigerant circulation circuit K includes the third generator, the third condenser, the third evaporator, the third absorber, the third heat exchanger, the refrigerant pump, the sixth spray tray and the eighth spray tray, a refrigerant pipe orifice of the third condenser and the eighth spray tray are respectively communicated with two ends of the refrigerant pump, the third condenser is communicated with the third generator at the same time, a dilute solution pipe orifice of the third absorber and the sixth spray tray are respectively communicated with two dilute solution pipe orifices of the third heat exchanger, and the third absorber is communicated with the third evaporator at the same time.
Compared with the prior art, the invention has the following technical effects:
according to the biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system, the two-stage absorption heat pump unit absorbs part of heat of the first flue gas heat exchange unit and the third flue gas heat exchanger, heating hot water flowing out of a water pipeline of the second condenser absorbs heat of the second flue gas heat exchanger, and the heating absorption heat pump unit absorbs residual heat of the third flue gas heat exchanger, so that flue gas waste heat energy gradient utilization can be realized; meanwhile, through reasonable pipeline arrangement, the waste heat in the biomass flue gas can be recycled, sensible heat and vaporization latent heat in the flue gas are absorbed, so that the whole recovery of the flue gas waste heat is realized, the flue gas waste heat is absorbed to the maximum extent, the temperature of the flue gas can be reduced to below 40 ℃ from 145 ℃, heating hot water is increased to above 70 ℃ from 45 ℃, the gradient utilization of the flue gas waste heat is realized, the problem of white feather of the flue gas is solved, the waste heat of the biomass flue gas can be absorbed to the maximum extent, and the practicability is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to the present invention;
wherein the reference numerals are: a first generator-1; a second generator-2; a first condenser-3; a first evaporator-4; a first absorber-5; a second absorber-6; a first heat exchanger-7; a second heat exchanger-8; a first solution pump-9; a second solution pump-10; a first spray pan-11; a second spray pan-12; a third spray tray-13; a fourth spray pan-14; a fifth spray tray-15; a second evaporator-16; a compressor-17; a second condenser-18; a throttle valve-19; a third generator-20; a third condenser-21; a third evaporator-22; a third absorber-23; a third heat exchanger-24; a third solution pump-25; a refrigerant pump-26; a sixth spray tray-27; a seventh spray disk-28; an eighth spray tray-29; a first flue gas heat exchanger-30; a second flue gas heat exchanger-31; a third flue gas heat exchanger-32.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The first embodiment is as follows:
as shown in fig. 1, the embodiment provides a biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system, which includes a two-stage absorption heat pump unit, a warming absorption heat pump unit, a compression heat pump unit, a first flue gas heat exchange unit, a second flue gas heat exchange unit, and a third flue gas heat exchange unit; the biomass flue gas can sequentially pass through the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit, the double-stage absorption heat pump unit is preferably arranged on the right side of the first flue gas heat exchange unit, the second evaporator 16 of the compression heat pump unit is coupled with the third condenser 21 of the warming absorption heat pump unit to form a warming absorption-compression coupling heat pump module, the warming absorption-compression coupling heat pump module is positioned on the right side of the third flue gas heat exchange unit, and the double-stage absorption heat pump unit is arranged above the warming absorption-compression coupling heat pump module. The double-stage absorption heat pump unit comprises a first generator 1, a second generator 2, a first condenser 3, a first evaporator 4, a first absorber 5, a second absorber 6, a first heat exchanger 7, a second heat exchanger 8, a first solution pump 9, a second solution pump 10, a first spray disc 11, a second spray disc 12, a third spray disc 13, a fourth spray disc 14, a fifth spray disc 15, a plurality of water pipeline connecting pipes and a plurality of refrigerant connecting pipes; the heating absorption-compression coupled heat pump module comprises a second evaporator 16, a compressor 17, a second condenser 18, a throttle valve 19, a third generator 20, a third condenser 21, a third evaporator 22, a third absorber 23, a third heat exchanger 24, a third solution pump 25, a refrigerant pump 26, a sixth spray disc 27, a seventh spray disc 28, an eighth spray disc 29, a plurality of water pipeline connecting pipes and a plurality of refrigerant connecting pipes; the first flue gas heat exchange unit mainly comprises a first flue gas heat exchanger 30 and a water pipeline connecting pipe, the second flue gas heat exchange unit mainly comprises a second flue gas heat exchanger 31 and a water pipeline connecting pipe, and the third flue gas heat exchange unit mainly comprises a third flue gas heat exchanger 32 and a water pipeline.
In this embodiment, as shown in fig. 1, the specific positions of each device in the dual-stage absorption heat pump unit are as follows: the upper end of the interior of the double-stage absorption heat pump unit is preferably provided with a first generator 1, a second generator 2 and a first condenser 3 from left to right in sequence, the lower end of the interior of the double-stage absorption heat pump unit is preferably provided with a first evaporator 4, a first absorber 5 and a second absorber 6 from left to right in sequence, the top of the first generator 1 is communicated with the top of the first condenser 3, the rightmost part of the second generator 2 is communicated with the top of the second absorber 6, the upper right part of the first evaporator 4 is communicated with the upper left part of the first absorber 5, a first spray disc 11 is positioned on the upper side of the interior of the second absorber 6, a second spray disc 12 is positioned on the upper side of the interior of the first generator 1, a third spray disc 13 is positioned on the upper side of the interior of the first absorber 5, a fourth spray disc 14 is positioned on the upper side of the interior of the second generator 2, a fifth spray disc 15 is positioned on the upper side of the interior of the first evaporator 4, a first heat exchanger 7 is positioned on the left side of the exterior of the absorption heat pump unit, a second heat exchanger 8 is positioned on the lower side of the interior of the first absorber 5, a first solution pump 9 is positioned below the second absorber 6, and a second absorber 5 is positioned below the second absorber 5.
In this embodiment, as shown in fig. 1, the specific positions of each device in the temperature-raising absorption-compression coupled heat pump module are as follows: the third evaporator 22 is located at the upper left portion inside the temperature-raising absorption heat pump unit, the third absorber 23 is located at the upper right portion inside the temperature-raising absorption heat pump unit, the third generator 20 is located at the lower left portion inside the temperature-raising absorption heat pump unit, the third condenser 21 is located at the lower right portion inside the temperature-raising absorption heat pump unit, the upper right portion of the third evaporator 22 is communicated with the upper left portion of the third absorber 23, the upper right portion of the third generator 20 is communicated with the upper left portion of the third condenser 21, the second evaporator 16 is located at the middle position inside the third condenser 21, the compressor 17 is located at the upper right portion outside the third condenser 21 of the temperature-raising absorption heat pump unit, the second condenser 18 is located at the lower right side of the compressor 17, the throttle valve 19 is located at the lower left portion of the second condenser 18 and at the lower right portion outside the third condenser 21 of the temperature-raising absorption heat pump unit, the third heat exchanger 24 is located below the third generator 20, the third solution pump 25 is located at the third heat exchanger 24, the refrigerant pump 26 is located below the third condenser 21, the sixth spray plate 27 is located at the upper side inside the third spray plate 20, the upper side of the seventh spray plate 28 is located at the upper side of the third spray plate 22, and the upper side of the third spray plate 22.
In this embodiment, as shown in fig. 1, the system further includes a high-temperature heat source water circulation loop a mainly composed of the first generator 1, the second generator 2, the first flue gas heat exchanger 30 and a water connection pipe, and a low-temperature heat source water circulation loop B mainly composed of the first evaporator 4, the third generator 20, the third evaporator 22, the third flue gas heat exchanger 32 and a water connection pipe. Wherein, the connection mode of each part of the high-temperature heat source water circulation loop A is as follows: a water pipeline at the upper right end of the first flue gas heat exchanger 30 is connected with a water pipeline at the lower left end of the first generator 1, a water pipeline at the upper right end of the first generator 1 is connected with a water pipeline at the upper left end of the second generator 2, and a water pipeline at the lower left end of the second generator 2 is connected with a water pipeline at the lower right end of the first flue gas heat exchanger 30; the connection mode of each part of the low-temperature heat source water circulation loop B is as follows: the water line at the right lower end of the third flue gas heat exchanger 32 is connected to the water line at the left lower end of the third generator 20, the water line at the left upper end of the third generator 20 is connected to the water line at the left upper end of the first evaporator 4, the water line at the left lower end of the first evaporator 4 is connected to the water line at the left upper end of the third evaporator 22, and the water line at the left lower end of the third evaporator 22 is connected to the water line at the right upper end of the third flue gas heat exchanger 32.
In this embodiment, as shown in fig. 1, the system further includes a heating hot water passage C mainly composed of the first condenser 3, the first absorber 5, the second absorber 6, the third absorber 23 and the water connecting pipeline, and a heating hot water passage D mainly composed of the second condenser 18, the second flue gas heat exchanger 31 and the water connecting pipeline. Wherein, the connection mode of each part of the heating hot water passage C is as follows: a heating hot water inlet pipe flowing into the system is connected with a water pipeline at the right lower end of a third absorber 23 through a point a, a water pipeline at the left upper end of the third absorber 23 is connected with a water pipeline at the lower right end of a first absorber 5, a water pipeline at the right lower end of the first absorber 5 is connected with a water pipeline at the left lower end of a second absorber 6, a water pipeline at the right upper end of the second absorber 6 is connected with a water pipeline at the right lower end of a first condenser 3, and a water pipeline at the right upper end of the first condenser 3 is connected with a heating hot water outlet pipe of the system through a point b; the connection mode of each part of the heating hot water passage D is as follows: a heating hot water inlet pipe flowing into the system is connected with a water pipeline at the right lower end of the second condenser 18 through a point a, a water pipeline at the upper end of the second condenser 18 is connected with a water pipeline at the right lower end of the second flue gas heat exchanger 31, and a water pipeline at the right upper end of the second flue gas heat exchanger 31 is connected with a heating hot water outlet pipe of the system through a point b.
In this embodiment, as shown in fig. 1, the system further includes a solution circulation loop E mainly composed of the first generator 1, the second absorber 6, the first heat exchanger 7, the first solution pump 9, the first spray pan 11, the second spray pan 12 and the solution connection pipeline, a solution circulation loop F mainly composed of the second generator 2, the first absorber 5, the second heat exchanger 8, the third spray pan 13, the second solution pump 10, the fourth spray pan 14 and the solution connection pipeline, and a solution circulation loop G mainly composed of the third generator 20, the third absorber 23, the third heat exchanger 24, the third solution pump 25, the sixth spray pan 27, the seventh spray pan 28 and the solution connection pipeline. Wherein, solution circulation circuit E each part connected mode does: a concentrated solution pipe orifice at the left lower end of the first generator 1 is connected with a concentrated solution pipe orifice at the right upper end of the first heat exchanger 7, a concentrated solution pipe orifice at the left lower end of the first heat exchanger 7 is connected with the right end of the first spray disc 11, a dilute solution pipe orifice at the lower end of the second absorber 6 is connected with the upper end of the first solution pump 9, the left end of the first solution pump 9 is connected with a dilute solution pipe orifice at the lower end of the first heat exchanger 7, and a dilute solution pipe orifice at the upper end of the first heat exchanger 7 is connected with the left end of the second spray disc 12; the connection mode of each part of the solution circulation loop F is as follows: a concentrated solution pipe orifice at the lower left end of the second generator 2 is connected with a concentrated solution pipe orifice at the upper left end of the second heat exchanger 8, a concentrated solution pipe orifice at the lower right end of the second heat exchanger 8 is connected with the left end of the third spray tray 13, a dilute solution pipe orifice at the lower end of the first absorber 5 is connected with the upper end of a second solution pump 10, the left end of the second solution pump 10 is connected with a dilute solution pipe orifice at the lower left end of the second heat exchanger 8, and a dilute solution pipe orifice at the upper right end of the second heat exchanger 8 is connected with the left end of a fourth spray tray 14; the connection mode of each part of the solution circulation loop G is as follows: the dilute solution pipe orifice at the right lower end of the third absorber 23 is connected with the dilute solution pipe orifice at the lower right end of the third heat exchanger 24, the dilute solution pipe orifice at the upper left end of the third heat exchanger 24 is connected with the right end of the sixth spray tray 27, the concentrated solution pipe orifice at the lower end of the third generator 20 is connected with the concentrated solution pipe orifice at the left end of the third heat exchanger 24, the concentrated solution pipe orifice at the right end of the third heat exchanger 24 is connected with the left end of the third solution pump 22, and the right end of the third solution pump 22 is connected with the right end of the seventh spray tray 28.
In this embodiment, as shown in fig. 1, the system further includes a refrigerant circulation circuit H mainly composed of the second evaporator 16, the compressor 17, the second condenser 18, the throttle valve 19, and the refrigerant connection line, a refrigerant circulation circuit J mainly composed of the first generator 1, the second generator 2, the first condenser 3, the first evaporator 4, the first absorber 5, the second absorber 6, the first heat exchanger 7, the second heat exchanger 8, the first solution pump 9, the second solution pump 10, the second spray pan 12, the fourth spray pan 14, the fifth spray pan 15, and the refrigerant connection line, and a refrigerant circulation circuit K mainly composed of the third generator 20, the third condenser 21, the third evaporator 22, the third absorber 23, the third heat exchanger 24, the refrigerant pump 26, the sixth spray pan 27, the eighth spray pan 29, and the refrigerant connection line. Wherein, the connection mode of each part of the refrigerant circulation loop H is as follows: a refrigerant pipe orifice at the right upper end of the second evaporator 16 is connected with the left end of a compressor 17, the right end of the compressor 17 is connected with a refrigerant pipe orifice at the left upper end of a second condenser 18, a refrigerant pipe orifice at the lower end of the second condenser 18 is connected with the right end of a throttle valve 19, and the left end of the throttle valve 19 is connected with a refrigerant pipe orifice at the right lower end of the second evaporator 16; the refrigerant circulation circuit J has the following connection modes: the top of a first generator 1 is communicated with the top of a first condenser 3, a refrigerant pipe orifice at the lower left end of the first condenser 3 is connected with the upper end of a fifth spray disc 15, the upper right part of a first evaporator 4 is communicated with the upper left part of a first absorber 5, a dilute solution pipe orifice at the lower end of the first absorber 5 is connected with the upper end of a second solution pump 10, the left end of the second solution pump 10 is connected with a dilute solution pipe orifice at the lower left end of a second heat exchanger 8, a dilute solution pipe orifice at the upper right end of the second heat exchanger 8 is connected with the left end of a fourth spray disc 14, the rightmost part of a second generator 2 is communicated with the top of a second absorber 6, a dilute solution pipe orifice at the lower end of the second absorber 6 is connected with the upper end of a first solution pump 9, the left end of the first solution pump 9 is connected with a dilute solution pipe orifice at the lower end of the first heat exchanger 7, and a dilute solution pipe orifice at the upper end of the first heat exchanger 7 is connected with the left end of a second spray disc 12; the refrigerant circulation circuit K is connected in the following mode: the upper right part of the third generator 20 is communicated with the upper left part of the third condenser 21, a refrigerant pipe orifice at the lower end of the third condenser 21 is connected with the upper end of a refrigerant pump 26, the left end of the refrigerant pump 26 is connected with the right end of an eighth spray disc 29, the upper right part of the third evaporator 22 is communicated with the upper left part of a third absorber 23, a dilute solution pipe orifice at the lower right end of the third absorber 23 is connected with a dilute solution pipe orifice at the lower right end of a third heat exchanger 24, and a dilute solution pipe orifice at the upper left end of the third heat exchanger 24 is connected with the right end of a sixth spray disc 27.
The embodiment combines on the basis of the work flow of 6 parts of the two-stage absorption heat pump unit, the warming absorption heat pump unit, the compression heat pump unit, the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit, and improves the pipeline connection mode to realize the system: the residual heat of the flue gas is utilized in a gradient manner, namely, the double-stage absorption heat pump unit absorbs part of heat of the first flue gas heat exchanger 30 and the third flue gas heat exchanger; the heating hot water flowing out of the second condenser water pipeline absorbs the heat of the second flue gas heat exchanger; the temperature rising absorption heat pump unit absorbs the residual heat of the third flue gas heat exchanger 32; heating hot water is reasonably distributed to each heat exchanger, the temperature is raised to high temperature for external use, and the parallel structure of the heating hot water channel is a connection flow obtained according to the heat exchange quantity and the temperature matching of each heat exchanger. The following is a description of the specific working principle of the embodiment:
the biomass flue gas firstly exchanges heat with heat source water through the first flue gas heat exchanger 30, the generated high-temperature heat source water flows into the double-stage absorption heat pump unit, the biomass flue gas after the first heat exchange flows to the second flue gas heat exchanger 31 to exchange heat with heating hot water to generate heating hot water with the temperature of more than 70 ℃, the biomass flue gas after the second heat exchange flows to the third flue gas heat exchanger 32 to exchange heat with the heat source water, the generated low-temperature heat source water flows into the heating absorption-compression coupling heat pump module, and the temperature of the biomass flue gas after the third heat exchange can be reduced to be lower than 40 ℃.
Two-stage absorption heat pump unit operation mode:
high-temperature heat source water generated by heat exchange of the first flue gas heat exchanger 30 enters the two-stage absorption heat pump unit as a high-temperature driving heat source, the high-temperature heat source water flows into the first generator 1, the high-temperature heat source water exchanges heat with the dilute solution to be cooled, the high-temperature heat source water subjected to primary cooling flows into the second generator 2 to exchange heat with the dilute solution to be cooled, the high-temperature heat source water subjected to secondary cooling flows back to the first flue gas heat exchanger 30 to exchange heat and be heated, and a high-temperature heat source water circulation loop A is formed. The low-temperature driving heat source of the double-stage absorption heat pump unit is low-temperature heat source water cooled by a third generator 20 in the heating absorption-compression coupling heat pump module, the low-temperature heat source water flows into the first evaporator 4 to exchange heat with the refrigerant for cooling, and the cooled low-temperature heat source water flows into a third evaporator 22 in the heating absorption-compression coupling heat pump module to form a part of a low-temperature heat source water circulation loop B.
The dilute solution in the first generator 1 is changed into a concentrated solution after exchanging heat with high-temperature heat source water, the concentrated solution is cooled by the first heat exchanger 7 and flows to the first spray disc 11 for spraying, the concentrated solution is sprayed in the second absorber 6 and mixed with gaseous refrigerant to release heat and change into a dilute solution, the dilute solution in the second absorber 6 flows to the first heat exchanger 7 through the first solution pump 9 to be heated, the dilute solution is sprayed by the second spray disc 13 after being heated and enters the first generator 1 to exchange heat with the high-temperature heat source and change into a dilute solution, and a solution circulation loop E in the two-stage absorption heat pump unit is formed. The dilute solution in the second generator 2 exchanges heat with the high-temperature heat source water after the primary temperature reduction to become a concentrated solution, the concentrated solution is cooled by the second heat exchanger 8 and flows to the third spray disc 13 for spraying, the concentrated solution is sprayed in the first absorber 5 to be mixed with the gaseous refrigerant to release heat to become the dilute solution, the dilute solution in the first absorber 5 flows to the second heat exchanger 8 through the second solution pump 10 to be heated, the dilute solution is sprayed by the fourth spray disc 14 after being heated to enter the second generator 2 to exchange heat with the high-temperature heat source after the primary temperature reduction to become the dilute solution, and a solution circulation loop F in the two-stage absorption heat pump unit is formed.
The concentrated solution exchanges heat with high-temperature heat source water in the first generator 1 to be changed into dilute solution, meanwhile, gaseous refrigerant can be generated, the gaseous refrigerant enters the first condenser 3 to be condensed and emit heat to be changed into liquid refrigerant, the liquid refrigerant is sprayed into the first evaporator 4 through the fifth spraying disc 15, the liquid refrigerant exchanges heat with a low-temperature heat source to be changed into gaseous refrigerant, the gaseous refrigerant and the concentrated solution sprayed out by the third spraying disc 13 are mixed to emit heat to be changed into dilute solution, the dilute solution in the first absorber 5 flows to the second heat exchanger 8 through the second solution pump 10 to be heated, the dilute solution is sprayed into the second generator 2 through the fourth spraying disc 14 after being heated to exchange heat with the high-temperature heat source after being cooled once to be changed into dilute solution, meanwhile, gaseous refrigerant is generated, the gaseous refrigerant enters the second absorber 6 to be mixed with the concentrated solution sprayed out by the first spraying disc 11 to emit heat to be changed into dilute solution, the dilute solution in the second absorber 6 flows to the first heat exchanger 7 through the first solution pump 9 to be heated, the dilute solution enters the first generator 1 through the second spraying disc 13 after being heated, the dilute solution is sprayed into the first generator 1 to be changed into the high-temperature heat source to be changed into dilute solution, and the gaseous refrigerant to be changed into a gaseous refrigerant circulation loop, and the gaseous refrigerant J, and the gaseous refrigerant again are generated.
The heating hot water of the two-stage absorption heat pump unit is from the first heating hot water heated by the third absorber 23 in the heating absorption-compression coupling heat pump module, the first heating hot water flows into the first absorber 5 to absorb the heat released by mixing the gaseous refrigerant and the concentrated solution, becomes the second heating hot water, flows into the second absorber 6 to absorb the heat released by mixing the gaseous refrigerant and the concentrated solution, becomes the third heating hot water, and flows out of the system through the point b to form a part of the heating hot water passage C.
The operation mode of the heating absorption-compression coupling heat pump module is as follows:
low-temperature heat source water generated by heat exchange of the third flue gas heat exchanger 32 is used as a low-temperature driving heat source and enters the heating absorption-compression coupling heat pump module, the low-temperature heat source water flows into the third generator 20 to exchange heat with the dilute solution for cooling, flows to the first evaporator 4 of the double-stage absorption heat pump unit for cooling again after cooling, flows into the third evaporator 22 for heat exchange and cooling after cooling twice, and flows back to the third flue gas heat exchanger 32 after cooling for three times, so that a low-temperature heat source water circulation loop B is formed.
The dilute solution in the third generator 20 exchanges heat with the low-temperature heat source water and then becomes a concentrated solution, the concentrated solution is heated by the third heat exchanger 24 and flows to the seventh spray tray 28 by the third solution pump 25 for spraying, the concentrated solution is sprayed in the third absorber 23 and mixed with the gaseous refrigerant to release heat and become the dilute solution, the dilute solution in the third absorber 23 is cooled by the third heat exchanger 24 and flows to the sixth spray tray 27 for spraying, and the dilute solution is sprayed in the third generator 20 and exchanges heat with the low-temperature heat source water and then becomes the concentrated solution, so that a solution circulation loop G is formed.
The liquid refrigerant in the second evaporator 16 absorbs the heat released by the third condenser 21 and turns into a gaseous refrigerant, the gaseous refrigerant is boosted by the compressor 17 and flows to the second condenser 18, the gaseous refrigerant exchanges heat with the heating hot water and is condensed into a liquid refrigerant, and the liquid refrigerant flows back to the second evaporator 16 through the throttle valve 19 to form a refrigerant circulation loop H.
The concentrated solution exchanges heat with low-temperature heat source water in the third generator 20 to become a dilute solution, and simultaneously generates a gaseous refrigerant, the gaseous refrigerant enters the third condenser 21 to be condensed and emit heat to become a liquid refrigerant, the liquid refrigerant flows to the eighth spray tray 29 through the refrigerant pump 26 to be sprayed, the liquid refrigerant is sprayed in the third evaporator 22 to exchange heat with the cooled low-temperature heat source to become the gaseous refrigerant, the gaseous refrigerant flows to the third absorber 23 to be mixed with the concentrated solution sprayed by the seventh spray tray 28 to emit heat to become a dilute solution, the dilute solution in the third absorber 23 flows to the sixth spray tray 27 through the third heat exchanger 24 to be cooled, the dilute solution is sprayed in the third generator 20 to exchange heat with the low-temperature heat source to become a dilute solution, and simultaneously generates the gaseous refrigerant to form a refrigerant circulation loop K.
One part of the heating hot water flowing into the system flows into the third absorber 23 through the point a to be heated, the heating hot water absorbs heat released by mixing of the gaseous refrigerant and the concentrated solution sprayed by the seventh spray disc 28, and flows to the two-stage absorption heat pump unit to be heated continuously after being heated to form the other part of the heating hot water passage C; the other part of the heating hot water flows into the second condenser 18 through the point a, the heating hot water absorbs heat released by condensation of the gaseous refrigerant in the second condenser 18, the heating hot water flows to the second flue gas heat exchanger 31 to absorb heat of the biomass flue gas after being heated, and the heating hot water flows out of the system through the point b after being heated again to form a heating hot water passage D.
The system can reduce the temperature of the flue gas from 145 ℃ to below 40 ℃, and the temperature of the heating hot water is increased from 45 ℃ to above 70 ℃, so that the gradient utilization of the flue gas waste heat is realized, the problem of white feather of the flue gas is solved, and the system can absorb the biomass flue gas waste heat to the maximum extent.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. The utility model provides a biomass flue gas waste heat total heat recovery type absorbs-compression coupling heat pump system which characterized in that: the system comprises a two-stage absorption heat pump unit, a warming absorption heat pump unit, a compression heat pump unit, a first flue gas heat exchange unit, a second flue gas heat exchange unit and a third flue gas heat exchange unit; the biomass flue gas sequentially passes through the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit; the double-stage absorption heat pump unit is positioned on one side of the first flue gas heat exchange unit, a first generator, a second generator and a first condenser which are sequentially connected are arranged at the upper end in the double-stage absorption heat pump unit, a first evaporator, a first absorber and a second absorber which are sequentially connected are arranged at the lower end in the double-stage absorption heat pump unit, the first generator is communicated with the first condenser, the second generator is communicated with the second absorber, and a first spray disc, a second spray disc, a third spray disc, a fourth spray disc and a fifth spray disc are respectively arranged in the second absorber, the first generator, the first absorber, the second generator and the first evaporator; a first heat exchanger is arranged on the outer side of the two-stage absorption heat pump unit, a second heat exchanger is arranged in the first absorber, a first solution pump is arranged below the second absorber, and a second solution pump is arranged below the first absorber; the compression heat pump unit is provided with a second evaporator, a third condenser of the warming absorption heat pump unit is coupled with the second evaporator of the compression heat pump unit to form a warming absorption-compression coupling heat pump module, the warming absorption-compression coupling heat pump module further comprises a third evaporator, a third absorber, a third generator, a second condenser and a compressor, the third evaporator is communicated with the third absorber, the third generator is communicated with the third condenser, a second evaporator is arranged in the third condenser, the top of the second condenser is connected with the second evaporator through the compressor, the bottom of the second condenser is connected with the second evaporator through a throttle valve, a third heat exchanger and a third solution pump connected with the third heat exchanger are arranged below the third generator, a refrigerant pump is arranged below the third condenser, and a sixth spray tray communicated with the third heat exchanger, a third spray tray communicated with the third solution pump and an eighth spray tray are respectively arranged in the third evaporator, the third absorber and the third evaporator;
the temperature-rising absorption-compression coupling heat pump module is positioned on one side of the third flue gas heat exchange unit, and the two-stage absorption heat pump unit is positioned above the temperature-rising absorption-compression coupling heat pump module; the first flue gas heat exchange unit, the second flue gas heat exchange unit and the third flue gas heat exchange unit are respectively connected with the two-stage absorption heat pump unit, the second condenser and the warming absorption heat pump unit; the first flue gas heat exchange unit comprises a first flue gas heat exchanger, the second flue gas heat exchange unit comprises a second flue gas heat exchanger, the third flue gas heat exchange unit comprises a third flue gas heat exchanger, and the first flue gas heat exchanger, the second flue gas heat exchanger and the third flue gas heat exchanger are sequentially communicated from top to bottom; the first generator, the second generator and the first flue gas heat exchanger are sequentially communicated end to form a high-temperature heat source water circulation loop A, the third flue gas heat exchanger, the third generator, the first evaporator and the third evaporator are sequentially communicated end to form a low-temperature heat source water circulation loop B, the heating hot water inlet pipe, the third absorber, the first absorber, the second absorber, the first condenser and the heating hot water outlet pipe are sequentially communicated to form a heating hot water passage C, and the heating hot water inlet pipe, the second condenser, the second flue gas heat exchanger and the heating hot water outlet pipe are sequentially connected to form a heating hot water passage D.
2. The biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to claim 1, characterized in that: the solution circulating loop E comprises the first generator, the second absorber, the first heat exchanger, the first solution pump, the first spraying disc and the second spraying disc, a concentrated solution pipe orifice of the first generator and the first spraying disc are respectively communicated with two concentrated solution pipe orifices of the first heat exchanger, the first solution pump and the second spraying disc are respectively communicated with two dilute solution pipe orifices of the first heat exchanger, and the first solution pump is simultaneously communicated with a dilute solution pipe orifice of the second absorber.
3. The biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to claim 1, characterized in that: the solution circulation loop F comprises the second generator, the first absorber, the second heat exchanger, the third spray disc, the second solution pump and the fourth spray disc, a concentrated solution pipe orifice of the second generator and the third spray disc are respectively communicated with two concentrated solution pipe orifices of the second heat exchanger, the second solution pump and the fourth spray disc are respectively communicated with two dilute solution pipe orifices of the second heat exchanger, and the second solution pump is simultaneously communicated with the dilute solution pipe orifice of the first absorber.
4. The biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to claim 1, characterized in that: the third generator, the third absorber, the third heat exchanger, the third solution pump, the sixth spray tray and the seventh spray tray are arranged in the solution circulation loop G, dilute solution nozzles of the sixth spray tray and the third absorber are respectively communicated with two dilute solution nozzles of the third heat exchanger, a concentrated solution nozzle of the third generator and the third solution pump are respectively communicated with two concentrated solution nozzles of the third heat exchanger, and the third solution pump is simultaneously communicated with the seventh spray tray.
5. The biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to claim 1, characterized in that: the refrigerant circulation loop H comprises the second evaporator, the compressor, the second condenser and the throttle valve, two ends of the compressor are respectively communicated with a refrigerant pipe orifice of the second evaporator and a refrigerant pipe orifice of the second condenser, and the other refrigerant pipe orifice of the second condenser and the other refrigerant pipe orifice of the second evaporator are respectively communicated with two ends of the throttle valve.
6. The biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to claim 1, characterized in that: the refrigerant circulation loop J comprises the first generator, the second generator, the first condenser, the first evaporator, the first absorber, the second absorber, the first heat exchanger, the second heat exchanger, the first solution pump, the second spray tray, the fourth spray tray and the fifth spray tray, wherein the first generator is communicated with the first condenser, a refrigerant pipe orifice of the first condenser is communicated with the fifth spray tray, the first evaporator is communicated with the first absorber, the second solution pump and the fourth spray tray are respectively communicated with two dilute solution pipe orifices of the second heat exchanger, the second solution pump is simultaneously communicated with a dilute solution pipe orifice of the first absorber, the second generator is communicated with the second absorber, the first solution pump and the second spray tray are respectively communicated with two dilute solution pipe orifices of the first heat exchanger, and the first solution pump is simultaneously communicated with the dilute solution absorber of the second heat exchanger.
7. The biomass flue gas waste heat total heat recovery type absorption-compression coupling heat pump system according to claim 1, characterized in that: still include refrigerant circulation circuit K, refrigerant circulation circuit K includes the third generator the third condenser the third evaporator the third absorber the third heat exchanger the refrigerant pump sixth spray dish and eighth spray dish, the refrigerant mouth of pipe of third condenser with the eighth spray dish respectively with the both ends intercommunication of refrigerant pump, the third condenser simultaneously with the third generator intercommunication, the dilute solution mouth of pipe of third absorber with the sixth spray dish respectively with two dilute solution mouths of pipe intercommunication of third heat exchanger, the third absorber simultaneously with the third evaporator intercommunication.
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