CN112361655A - Heat pump driven by gas engine - Google Patents
Heat pump driven by gas engine Download PDFInfo
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- CN112361655A CN112361655A CN202011174945.7A CN202011174945A CN112361655A CN 112361655 A CN112361655 A CN 112361655A CN 202011174945 A CN202011174945 A CN 202011174945A CN 112361655 A CN112361655 A CN 112361655A
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- heat exchanger
- refrigerant
- flue gas
- gas
- heat
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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
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a heat pump driven by a gas engine, which comprises the gas engine, a cylinder sleeve water heat exchanger, a cylinder sleeve water pump, a transmission device, a compressor, a first refrigerant heat exchanger, a second refrigerant heat exchanger, a first throttling device, a first flue gas heat exchanger and a second flue gas heat exchanger. The first flue gas heat exchanger and the second flue gas heat exchanger are arranged on a smoke exhaust flue of the gas engine, flue gas in the first flue gas heat exchanger heats cylinder sleeve water, and flue gas in the second flue gas heat exchanger heats refrigerant; the cylinder liner water is heated in the first flue gas heat exchanger and the cylinder liner of the gas engine respectively, is boosted by the cylinder liner water pump, and is discharged with heat through the cylinder liner water heat exchanger; the refrigerant side of the second flue gas heat exchanger is connected in parallel with the refrigerant side of the first refrigerant heat exchanger. The high-temperature waste heat of the flue gas is directly used for heat exchange, and the low-temperature waste heat is transferred to the refrigerant to improve the grade through the heat pump, so that the grading and high-efficiency utilization of the flue gas waste heat is realized.
Description
Technical Field
The invention relates to a heat pump, in particular to a heat pump driven by a gas engine.
Background
The heat pump driven by the gas engine has continuous progress, and is widely applied to the field of refrigeration and heating. Most of heat pump units driven by gas engines on the market are small multi-split air-conditioning units developed by companies such as Japan Mars, Sanyo and the like, are mostly used for family residences, small businesses or small office buildings, have limited use occasions, particularly fail to realize graded utilization of waste heat of engine smoke, and have obvious economic benefit and environmental protection benefit by adopting high-efficiency gas heat pumps to replace gas hot water boilers along with implementation of sustainable development strategy and continuous enhancement of energy-saving and environmental protection awareness.
Chinese patent CN101865501B discloses a semi-heat recovery type GHP gas engine driven air conditioner/heat pump unit, in which a refrigerant heat recovery heat exchanger is arranged in a refrigerant system, a cooling water heat recovery heat exchanger is arranged in the engine system, and a domestic hot water loop is connected in series with the refrigerant heat recovery heat exchanger and the cooling water heat recovery heat exchanger. The flue gas heat exchanger only has one flue gas heat exchanger, and the flue gas in the flue gas heat exchanger is radiated to cylinder liner water, and the exhaust gas temperature is high, and the recovered flue gas heat is less, and the condensation heat recovery to the flue gas is difficult to realize, causes the flue gas waste heat utilization insufficient.
Japanese patent JP2001248935A discloses a method for recovering engine waste heat in an engine heat pump, where heat from engine exhaust gas is absorbed by cylinder water in a flue gas heat exchanger and refrigerant in a second auxiliary heat exchanger. After the flue gas in the flue gas heat exchanger radiates heat to the cylinder liner water, the cylinder liner water radiates heat to the refrigerant in the first auxiliary heat exchanger arranged on the path of the indoor heat exchanger and the return compressor, and the second auxiliary heat exchanger is arranged on the path of the indoor heat exchanger and the return compressor. The flue gas heat recovery volume of this patent is big, but the flue gas heat energy all transmits the return circuit of breathing in of compressor, and this heat energy is all consumed the power compression by the compressor and just can realize flue gas heat utilization through heat pump technology, and the high temperature part in the flue gas heat can not directly utilize through the heat transfer.
Chinese patent CN201610203393.5 discloses a gas-driven air source heat pump heat supply unit for central heating system, in which a flue gas waste heat recoverer is arranged on a flue gas pipeline of an internal combustion engine, a water outlet pipeline of the flue gas waste heat recoverer is connected with a water supply pipeline of the heating system, a flue gas secondary heat exchanger is used as a second evaporator of the heat pump, a refrigerant flows through a first evaporator first and then flows through the second evaporator to return to a compressor, and the flue gas pipeline is further connected with a defrosting device of the first evaporator. Japanese patent JP2001248935A has been improved to this patent, has realized the hierarchical waste heat recovery of flue gas, but heating hot water directly passes through flue gas waste heat recoverer, and heating hot water quality of water is not good easily causes the scale deposit of flue gas waste heat recoverer, flue gas waste heat recoverer efficiency greatly reduced. And the pressure of the heating hot water is high, the temperature is higher, the pressure is higher than the pressure bearing of a water connecting pipe of the engine cylinder sleeve, and the direct connection and the use can cause the clamp type rubber connecting piece of the water pipeline of the cylinder sleeve to fall off and pipe burst. The flue gas is low in temperature and high in humidity after being subjected to heat dissipation by the flue gas waste heat recoverer and the flue gas secondary heat exchanger, so that a frost layer covered on the surface of the air source evaporator is not melted enough, and even the frost layer is thickened and encrypted.
Therefore, a new gas engine driven heat pump with reasonable structural design, high heat energy recovery and utilization rate and safe and stable operation is needed to at least solve the problems existing in the prior art.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides the novel heat pump driven by the gas engine, which has reasonable structural design, high heat energy recovery utilization rate and safe and stable operation.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a heat pump driven by a gas engine, which comprises the gas engine, a cylinder sleeve water heat exchanger, a compressor, a first refrigerant heat exchanger, a second refrigerant heat exchanger, a first smoke heat exchanger and a second smoke heat exchanger, wherein the first smoke heat exchanger and the second smoke heat exchanger are arranged on a smoke exhaust flue of the gas engine, the first smoke heat exchanger is connected with the cylinder sleeve water heat exchanger through a pipeline, the compressor is connected with the gas engine through a transmission device, the second smoke heat exchanger is connected with the first refrigerant heat exchanger in parallel through a pipeline and then connected with the compressor through a pipeline, and the first refrigerant heat exchanger is also connected with the second refrigerant heat exchanger through a pipeline.
Optionally, the system further comprises an economizer which is arranged between the first refrigerant heat exchanger and the second refrigerant heat exchanger and is connected with the compressor through a pipeline.
Optionally, the method further comprises: the first throttling device is arranged between the economizer and the first refrigerant heat exchanger and used for throttling the refrigerant flowing out of the economizer; and the second throttling device is arranged between the economizer and the second refrigerant heat exchanger and used for throttling the refrigerant flowing into the economizer.
Optionally, the condensed refrigerant liquid in the second refrigerant heat exchanger is divided into two paths, the first path flows into the economizer, the second path is throttled by the second throttling device and then cools the rest of the refrigerant liquid in the first path to become refrigerant gas, and then flows back to the compressor, the refrigerant liquid flowing into the economizer in the first path is divided into two branches after being cooled, the refrigerant in the first branch flows into the first refrigerant heat exchanger after being throttled by the first throttling device, the refrigerant in the second branch is heated to be refrigerant gas by the second flue gas heat exchanger, and the refrigerant flowing out from the first branch and the refrigerant flowing out from the second branch are converged and then flows back to the compressor.
Optionally, the method further comprises: an oil separator for separating lubricating oil from refrigerant gas discharged from the compressor; and the four-way reversing valve is arranged on pipelines between the oil separator and the second refrigerant heat exchanger and between the second flue gas heat exchanger and the compressor.
Optionally, a third throttling device is further included, and is arranged on the refrigerant pipeline of the second flue gas heat exchanger.
Optionally, the system further comprises a cylinder liner water pump, and the cylinder liner water pump is used for boosting the cylinder liner water after the cylinder liner water is heated in the first flue gas heat exchanger and the cylinder liner of the gas engine respectively, so as to discharge heat through the cylinder liner water heat exchanger.
Optionally, a steam generator is arranged in the smoke exhaust flue between the gas engine and the first smoke heat exchanger, and water absorbs heat of high-temperature smoke in the steam generator to generate steam.
Compared with the prior art, the invention has the following advantages:
(1) the heat energy of the flue gas is utilized in a grading manner, the high-grade flue gas waste heat is directly radiated to the cylinder sleeve water through the first flue gas heat exchanger, and then is radiated to hot water or air through the cylinder sleeve water heat exchanger for direct waste heat utilization. The low-grade flue gas waste heat is radiated to the refrigerant through the second flue gas heat exchanger, and the refrigerant is used for radiating through the second refrigerant heat exchanger after being consumed by the compressor to compress and improve the grade.
(2) The heat transfer temperature difference between the flue gas in the first flue gas heat exchanger and the water in the cylinder sleeve is large, and the heat transfer temperature difference between the flue gas in the second flue gas heat exchanger and the refrigerant is large. The first flue gas heat exchanger and the second flue gas heat exchanger are small in heat exchange area, compact in structure and low in heat exchanger cost.
(3) In the prior art, hot water directly flows into the flue gas heat exchanger, and if the quality of the heating hot water is poor, the scale of the flue gas waste heat recoverer is easy to cause, and the efficiency of the flue gas waste heat recoverer is greatly reduced.
The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow diagram of one embodiment of a gas engine driven heat pump of the present invention;
FIG. 2 is a flow diagram of an embodiment of a gas engine driven heat pump of the present invention;
FIG. 3 is a three-flow diagram of one embodiment of a gas engine driven heat pump of the present invention;
FIG. 4 is a flow diagram of a fourth embodiment of a gas engine driven heat pump of the present invention;
FIG. 5 is a cylinder liner water heat exchange and steam generator embodiment of a gas engine driven heat pump of the present invention.
Description of the figure numbering: 1. the system comprises a gas engine, 2, a compressor, 3, a first refrigerant heat exchanger, 4, a second refrigerant heat exchanger, 5, a first throttling device, 6, a second throttling device, 7, an economizer, 8, a first flue gas heat exchanger, 10, a second flue gas heat exchanger, 13, a four-way reversing valve, 14, a cylinder sleeve water heat exchanger, 16, an oil separator, 18, a transmission device, 19, a first one-way valve, 20, a second one-way valve, 21, a third one-way valve, 22, a fourth one-way valve, 23, a drying filter, 27, an intercooler, 31, an economizer first valve, 34, hot water, 37, a fourth throttling device, 40, a compressor lubricating oil loop, 41, a cylinder sleeve water loop, 130, a first flue, 138, a cylinder sleeve water pump, 140 and a steam generator.
Detailed Description
In order to make the objects, embodiments and advantages of the embodiments of the present invention clearer, the following description of the present invention with reference to the accompanying drawings makes a more complete description of the present invention so that those skilled in the art can better understand the present invention and can implement the present invention, but the present invention is not limited to the illustrated embodiments.
It should be noted that the term "connected" as used herein includes both direct connection and indirect connection of two components through other components. The valve, the one-way valve, the four-way reversing valve and the like are necessary or unnecessary components.
Fig. 1 shows a first embodiment of a heat pump driven by a gas engine, which includes a gas engine 1, a compressor 2, a first refrigerant heat exchanger 3, a second refrigerant heat exchanger 4, a first throttling device 5, a second throttling device 6, an economizer 7, a first flue gas heat exchanger 8, a second flue gas heat exchanger 10, a four-way reversing valve 13, a cylinder liner water heat exchanger 14, an oil separator 16, a transmission device 18, a first check valve 19, a second check valve 20, a third check valve 21, a fourth check valve 22, a drying filter 23, an economizer first valve 31, hot water 34, a fourth throttling device 37, a compressor lubricating oil circuit 40, a cylinder liner water circuit 41, a first flue 130, and a cylinder liner water pump 138. The first flue gas heat exchanger 8 and the second flue gas heat exchanger 10 are arranged on a smoke exhaust flue of the gas engine 1, flue gas in the first flue gas heat exchanger 8 heats cylinder jacket water, and flue gas in the second flue gas heat exchanger 10 heats a refrigerant; the cylinder liner water is heated in the first flue gas heat exchanger 8 and the cylinder liner of the gas engine respectively, is boosted by the cylinder liner water pump, and is discharged through the cylinder liner water heat exchanger; the refrigerant side of the second flue gas heat exchanger 10 is connected in parallel with the refrigerant side of the first refrigerant heat exchanger 3. Wherein, the economizer 7 has the function of a heat exchanger for improving the heat exchange efficiency. Which absorbs heat by throttling evaporation of the refrigerant itself to subcool another portion of the refrigerant.
The gas engine 1 and the compressor 2 are connected by a transmission 18. The gas engine 1 is a natural air suction or turbocharging type, and an air inlet filtering pipeline, a gas inlet pipeline, a smoke silencer and the like which are attached to the gas engine belong to the prior art and are not described again. The transmission 18 is in the form of one of a change speed gearbox, a pulley or a flywheel disc, connected at one end to the engine and at the other end to the compressor, to transmit the power of the gas engine 1 to the compressor 2. The rotating speed of the gas engine 1 is continuously adjustable, and the rotating speed of the gas engine 1 under different operating conditions is adjusted to adjust the rotating speed of the compressor 2, so that the gas engine 1 drives the compressor 2. The compressor 2, the first refrigerant heat exchanger 3, the second refrigerant heat exchanger 4, the first throttling device 5, the second throttling device 6, the economizer 7, the second flue gas heat exchanger 10, the four-way reversing valve 13, the cylinder liner water heat exchanger 14, the oil separator 16, the first check valve 19, the second check valve 20, the third check valve 21, the fourth check valve 22, the drying filter 23, the economizer first valve 31 and the compressor lubricating oil loop 40 form a vapor compression heat pump cycle with the economizer.
The compressor 2 is one of an open-type screw compressor, an open-type magnetic suspension centrifugal compressor and an open-type scroll compressor. The refrigerant in the compressor 2 is one of NH3, R718, HCFC22, HFC134a, HFC407C, HFC410a, HFC245fa, HFC507A, HFO1234yf and HFO1234 zf.
High-temperature flue gas generated after the mixed combustion of the fuel gas and the air in the gas engine 1 flows through the first flue gas heat exchanger 8 in the first flue 130, and a part of flue gas waste heat is dissipated into the cylinder liner water. The liner water flows through the first flue gas heat exchanger 8 in the liner water pipeline 41 to be heated, then flows through the liner of the gas engine 1 to be heated, is boosted by the liner water pump 138 installed on the gas engine 1, then flows through the liner water heat exchanger 14, and discharges heat to the external hot water 34 (the hot water with low temperature, for example, the hot water with 30 ℃ to higher temperature) for waste heat utilization. The first flue gas heat exchanger 8 is one of a plate-shell type heat exchanger, a plate-fin type heat exchanger and a fin-tube type heat exchanger.
In the heating mode, the refrigerant gas containing the lubricant oil discharged from the compressor 2 first passes through the oil separator 16, and the separated lubricant oil flows back to the compressor 2 through the compressor lubricant oil circuit 40. The refrigerant gas flowing out of the oil separator 16 continues to pass through the four-way reversing valve 13 to the second refrigerant heat exchanger 4, and heat in the refrigerant gas is condensed in the second refrigerant heat exchanger 4 and discharged to external water or air, so that heat energy utilization is realized. The refrigerant liquid condensed in the second refrigerant heat exchanger 4 passes through the second check valve 20, passes through the dry filter 23, and the economizer 7. In the economizer 7, a part of refrigerant liquid is throttled by the second throttling device 6 and then becomes low-temperature low-pressure gas-liquid two-phase refrigerant, and the low-temperature low-pressure gas-liquid two-phase refrigerant cools the rest refrigerant liquid in the economizer 7 and then becomes refrigerant gas, and flows back to the economizer port of the compressor 2 through the economizer first valve 31. The refrigerant liquid flowing out of the economizer 7 is throttled by the first throttling device 5 on one path and then becomes gas-liquid two-phase refrigerant, flows through the third one-way valve 21 to the first refrigerant heat exchanger 3, absorbs the heat energy of the outside air or water in the first refrigerant heat exchanger 3, and becomes gas refrigerant; the other path of the refrigerant liquid flowing out of the economizer 7 is throttled by a fourth throttling device 37 to become a gas-liquid two-phase refrigerant, the refrigerant flows through the second flue gas heat exchanger 10 to absorb the heat of the flue gas to become a gas refrigerant, and the gas refrigerant flowing out of the second flue gas heat exchanger 10 is converged with the gas refrigerant flowing out of the first refrigerant heat exchanger 3 and then flows back to a suction port of the compressor through a four-way reversing valve 13. The economizer first valve 31 is one of a check valve, a solenoid valve, or an electric ball valve. In the heating mode, the first check valve 19 and the fourth check valve 22 are closed.
Fig. 2 shows a second embodiment of a gas engine driven heat pump according to the present invention, fig. 2 differing from fig. 1 by the absence of the economizer 7, the first economizer valve 31 and the corresponding piping. In the heating mode, after the refrigerant liquid condensed by the second refrigerant heat exchanger 4 passes through the second check valve 20 and flows through the drying filter 23, one path of refrigerant is throttled by the first throttling device 5 to become gas-liquid two-phase refrigerant, flows through the third check valve 21 to the first refrigerant heat exchanger 3, and absorbs the heat energy of the outside air or water in the first refrigerant heat exchanger 3 to become gas refrigerant; the other path of refrigerant liquid is throttled by the fourth throttling device 37 to become a gas-liquid two-phase refrigerant, and flows through the second flue gas heat exchanger 10 to absorb the heat of the flue gas to become a gas refrigerant. The gas refrigerant flowing out of the second flue gas heat exchanger 10 and the gas refrigerant flowing out of the first refrigerant heat exchanger 3 are converged and then flow back to the suction port of the compressor through the four-way reversing valve 13. The rest of fig. 2 is the same as fig. 1.
Fig. 3 shows a third embodiment of the heat pump driven by the gas engine according to the present invention, which includes the gas engine 1, the compressor 2, the first refrigerant heat exchanger 3, the second refrigerant heat exchanger 4, the first throttling device 5, the second throttling device 6, the economizer 7, the first flue gas heat exchanger 8, the second flue gas heat exchanger 10, the cylinder liner water heat exchanger 14, the oil separator 16, the transmission device 18, the economizer first valve 31, the hot water 34, the fourth throttling device 37, the compressor lubricating oil circuit 40, the cylinder liner water circuit 41, the first flue 130, and the cylinder liner water pump 138.
The gas engine 1 and the compressor 2 are connected by a transmission 18. The gas engine 1 is a natural air suction or turbocharging type, and an air inlet filtering pipeline, a gas inlet pipeline, a smoke silencer and the like which are attached to the gas engine belong to the prior art and are not described again. The transmission 18 is in the form of one of a change speed gearbox, a pulley or a flywheel disc, connected at one end to the engine and at the other end to the compressor, to transmit the power of the gas engine 1 to the compressor 2. The rotating speed of the gas engine 1 is continuously adjustable, and the rotating speed of the gas engine 1 under different operating conditions is adjusted to adjust the rotating speed of the compressor 2, so that the gas engine 1 drives the compressor 2. The compressor 2, the first refrigerant heat exchanger 3, the second refrigerant heat exchanger 4, the first throttling device 5, the second throttling device 6, the economizer 7, the second flue gas heat exchanger 10, the cylinder liner water heat exchanger 14, the oil separator 16, the economizer first valve 31 and the compressor lubricating oil loop 40 form a vapor compression heat pump cycle with the economizer. The compressor 2 is one of an open-type screw compressor, an open-type magnetic suspension centrifugal compressor and an open-type scroll compressor. The refrigerant in the compressor 2 is one of NH3, R718, HCFC22, HFC134a, HFC407C, HFC410a, HFC245fa, HFC507A, HFO1234yf and HFO1234 zf.
High-temperature flue gas generated after the mixed combustion of the fuel gas and the air in the gas engine 1 flows through the first flue gas heat exchanger 8 in the first flue 130, and a part of flue gas waste heat is dissipated into the cylinder liner water. The cylinder liner water flows through the first flue gas heat exchanger 8 in the cylinder liner water pipeline 41 to be heated, then flows through the cylinder liner of the gas engine 1 to be heated continuously, is boosted by a cylinder liner water pump 138 arranged on the gas engine 1 and then flows through the cylinder liner water heat exchanger 14, heat is discharged to the external hot water 34, and waste heat utilization is carried out. The first flue gas heat exchanger 8 is one of a plate-shell type heat exchanger, a plate-fin type heat exchanger and a fin-tube type heat exchanger.
In the heating mode, the refrigerant gas containing the lubricant oil discharged from the compressor 2 first passes through the oil separator 16, and the separated lubricant oil flows back to the compressor 2 through the compressor lubricant oil circuit 40. The refrigerant gas flowing out of the oil separator 16 continues to pass through the second refrigerant heat exchanger 4, and heat in the refrigerant gas is condensed in the second refrigerant heat exchanger 4 and discharged to external water or air, so that heat energy utilization is realized. The refrigerant liquid condensed in the second refrigerant heat exchanger 4 flows through the economizer 7. In the economizer 7, a part of refrigerant liquid is throttled by the second throttling device 6 and then becomes low-temperature low-pressure gas-liquid two-phase refrigerant, and the low-temperature low-pressure gas-liquid two-phase refrigerant cools the rest refrigerant liquid in the economizer 7 and then becomes refrigerant gas, and flows back to the economizer port of the compressor 2 through the economizer first valve 31. The refrigerant liquid flowing out of the economizer 7 is throttled by a first throttling device 5 and then changed into gas-liquid two-phase refrigerant, flows to a first refrigerant heat exchanger 3, absorbs heat energy of outside air or water in the first refrigerant heat exchanger 3 and is changed into gas refrigerant; the other path of the refrigerant liquid flowing out of the economizer 7 becomes gas-liquid two-phase refrigerant after being throttled by the fourth throttling device 37, flows through the second flue gas heat exchanger 10, and absorbs the heat of the flue gas to become gas refrigerant. The gas refrigerant flowing out of the second flue gas heat exchanger 10 and the gas refrigerant flowing out of the first refrigerant heat exchanger 3 are converged and then flow back to the air suction port of the compressor. The economizer first valve 31 is one of a check valve, a solenoid valve, or an electric ball valve.
In the heating mode, the flue gas flowing out of the first flue gas heat exchanger 8 flows through the second flue gas heat exchanger 10 again, and the heat of the flue gas continuously dissipates to the refrigerant flowing out of the economizer 7 in the second flue gas heat exchanger 10. The second flue gas heat exchanger 10 is one of a plate-shell type heat exchanger, a plate-fin type heat exchanger, and a fin-tube type heat exchanger. The refrigerant is heated in the second flue gas heat exchanger 10 and then flows back to the suction port of the compressor 2.
Fig. 4 is a fourth embodiment of a gas engine driven heat pump of the present invention, fig. 4 differing from fig. 3 in the absence of the economizer 7, the first economizer valve 31 and the corresponding piping. In a heating mode, the refrigerant liquid condensed by the second refrigerant heat exchanger 4 is throttled by the first throttling device 5 and then becomes a gas-liquid two-phase refrigerant, the gas-liquid two-phase refrigerant flows to the first refrigerant heat exchanger 3, and the heat energy of outside air or water is absorbed in the first refrigerant heat exchanger 3 and becomes a gas refrigerant; the other path of refrigerant liquid is throttled by the fourth throttling device 37 to become a gas-liquid two-phase refrigerant, and flows through the second flue gas heat exchanger 10 to absorb the heat of the flue gas to become a gas refrigerant. The gas refrigerant flowing out of the second flue gas heat exchanger 10 and the gas refrigerant flowing out of the first refrigerant heat exchanger 3 are converged and then flow back to the air suction port of the compressor. The rest of fig. 4 is the same as fig. 3.
FIG. 5 is a cylinder liner water heat exchange and steam generator embodiment of a gas engine driven heat pump of the present invention. The engine 1 is a turbocharged engine with an intercooler 27. The flue gas discharged by the gas engine 1 is radiated to the cylinder liner water in the first flue gas heat exchanger 8. In the cylinder liner water pipeline 41, the cylinder liner water absorbs the residual heat of the flue gas in the first flue gas heat exchanger 8 to raise the temperature, then the temperature of the cylinder liner flowing through the gas engine 1 is continuously raised, the pressure of the cylinder liner water flowing through the cylinder liner water heat exchanger 14 is raised by the cylinder liner water pump 138 installed on the gas engine 1, and the heat is discharged to the external hot water or air to utilize the residual heat. The cylinder liner water flowing out of the cylinder liner water heat exchanger 14 flows through the intercooler to be heated and then flows to the first flue gas heat exchanger 8 to complete a cycle. The high-temperature flue gas discharged from the gas engine 1 flows into the steam generator 140 to exchange heat with water, and steam is generated. The first flue gas heat exchanger 8 is one of a plate-shell type heat exchanger, a plate-fin type heat exchanger and a fin-tube type heat exchanger. The liner water heat exchanger 14 is one or a combination of a water-water or water-air heat exchanger. The cylinder liner water heat exchanger 14 is one of a plate heat exchanger, a shell-and-tube heat exchanger, a plate fin heat exchanger, and a fin tube heat exchanger. The steam generator 140 is one of a plate-shell heat exchanger, a plate-fin heat exchanger, and a fin-tube heat exchanger.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "back", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing the present invention, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation. The terms "mounted," "disposed," "connected," and "means" are to be construed broadly and therefore should not be construed to limit the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A gas engine driven heat pump characterized by: the heat pump comprises a gas engine, a cylinder sleeve water heat exchanger, a compressor, a first refrigerant heat exchanger, a second refrigerant heat exchanger, a first smoke heat exchanger and a second smoke heat exchanger, wherein the first smoke heat exchanger and the second smoke heat exchanger are arranged on a smoke exhaust flue of the gas engine, the first smoke heat exchanger is connected with the cylinder sleeve water heat exchanger through a pipeline, the compressor is connected with the gas engine through a transmission device, the second smoke heat exchanger is connected with the first refrigerant heat exchanger through a pipeline in parallel, and then is connected with the compressor through a pipeline, and the first refrigerant heat exchanger is further connected with the second refrigerant heat exchanger through a pipeline.
2. A gas engine driven heat pump according to claim 1, further comprising a third throttling means provided on the refrigerant line of the second flue gas heat exchanger.
3. A gas engine driven heat pump as set forth in claim 1, further comprising an economizer disposed between the first refrigerant heat exchanger and the second refrigerant heat exchanger and connected to the compressor by a pipe.
4. A gas engine driven heat pump as set forth in claim 3, further comprising:
the first throttling device is arranged between the economizer and the first refrigerant heat exchanger and used for throttling the refrigerant flowing out of the economizer;
and the second throttling device is arranged between the economizer and the second refrigerant heat exchanger and used for throttling the refrigerant flowing into the economizer.
5. The gas engine driven heat pump according to claim 4, wherein the condensed refrigerant liquid in the second refrigerant heat exchanger is divided into two paths, the first path flows into the economizer, the second path is throttled by the second throttling device and cools the rest of the refrigerant liquid in the first path to become refrigerant gas, and then flows back to the compressor, the refrigerant liquid flowing into the economizer in the first path is cooled and then divided into two branches, the refrigerant in the first branch flows into the first refrigerant heat exchanger after being throttled by the first throttling device, the refrigerant in the second branch is heated to be refrigerant gas by the second flue gas heat exchanger, and the refrigerant flowing out from the first branch and the refrigerant flowing out from the second branch are converged and then flow back to the compressor.
6. A gas engine driven heat pump as set forth in claim 1, further comprising:
an oil separator for separating lubricating oil from refrigerant gas discharged from the compressor;
and the four-way reversing valve is arranged on pipelines between the oil separator and the second refrigerant heat exchanger and between the second flue gas heat exchanger and the compressor.
7. The gas engine driven heat pump of claim 1, further comprising a liner water pump for boosting liner water after the liner water is heated in the first flue gas heat exchanger and the liner of the gas engine, respectively, to discharge heat through the liner water heat exchanger.
8. A gas engine driven heat pump according to claim 1, wherein the flue gas duct between the gas engine and the first flue gas heat exchanger is provided with a steam generator in which water absorbs heat from the high temperature flue gas to produce steam.
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| CN202011174945.7A CN112361655A (en) | 2020-10-28 | 2020-10-28 | Heat pump driven by gas engine |
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| CN202011174945.7A CN112361655A (en) | 2020-10-28 | 2020-10-28 | Heat pump driven by gas engine |
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Application publication date: 20210212 |