CN114576693A - Gas heat pump heating system - Google Patents
Gas heat pump heating system Download PDFInfo
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- CN114576693A CN114576693A CN202011373735.0A CN202011373735A CN114576693A CN 114576693 A CN114576693 A CN 114576693A CN 202011373735 A CN202011373735 A CN 202011373735A CN 114576693 A CN114576693 A CN 114576693A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 187
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 162
- 239000002918 waste heat Substances 0.000 claims abstract description 93
- 239000003507 refrigerant Substances 0.000 claims abstract description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 29
- 239000003546 flue gas Substances 0.000 claims description 29
- 238000005338 heat storage Methods 0.000 claims description 18
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 12
- 238000012986 modification Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/02—Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters
-
- 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
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/32—Heat sources or energy sources involving multiple heat sources in combination or as alternative heat sources
-
- 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
- F25B2327/00—Refrigeration system using an engine for driving a compressor
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a gas heat pump heating system, which is arranged in a heating pipe network and used for outputting water supply after the temperature of return water is raised, and is characterized by comprising the following components: the gas heat pump system comprises a gas heat pump subsystem and a boiler subsystem which are arranged in parallel, backwater is divided into a first branch flowing into the gas heat pump subsystem and a second branch flowing into the boiler subsystem, and the two subsystems run singly or jointly, wherein the gas heat pump subsystem comprises at least one gas heat pump unit, each gas heat pump unit comprises a gas engine, an engine waste heat exchange unit, a compressor, a condenser and an evaporator, refrigerant in the evaporator absorbs heat from air or water source water, the gas engine drives the compressor to compress the refrigerant, the compressed refrigerant releases heat in the condenser, the engine waste heat exchange unit absorbs the waste heat of the gas engine to release heat, water flow of the first branch passes through the condenser and the engine waste heat exchange unit, and the heat is absorbed and the temperature is raised after heat exchange.
Description
Technical Field
The invention relates to a heat pump heating system, in particular to a gas heat pump heating system.
Background
Boiler heating is one of the main forms of central heating in the north, and the heat energy is from the heat of fuel combustion. At present, with the implementation of a sustainable development strategy, the continuous enhancement of energy conservation and environmental protection awareness and the promotion of a north winter coal-to-gas heating policy, boiler heat supply cannot meet the social needs.
Chinese patent publication No. CN1916507A discloses a heat pump and boiler combined heating system, which comprises a heat pump unit, a boiler, a circulating water pump, a low-level heat source, a heat dissipation device, a constant-pressure water replenishing device, a connecting pipeline, and the like, wherein the heat pump and the boiler are connected in series in the heating system. During actual operation, a heat medium is heated by the heat pump firstly and then by the boiler, the heat pump bears basic heat load, and the boiler bears peak heat load. However, this heating system has a limited heating efficiency in a low-temperature environment.
Chinese patent publication No. CN101551136A discloses a device for preparing hot water by using a boiler and an air heat source together, in which the boiler and an absorption heat pump unit are used in combination, the hot water or steam generated by the boiler is used as a driving heat source of the absorption heat pump unit, an air-cooled heat exchanger is used to directly or indirectly extract heat from air, and low-temperature hot water returned from tap water or a user terminal is sequentially fed into an absorber and a condenser of the absorption heat pump unit to prepare high-temperature hot water. However, this device has the following problems in application: the absorption heat pump has low efficiency and even is difficult to operate in cold seasons in the north in winter and in occasions with low air temperature; in addition, the device is difficult to provide hot water with the temperature higher than 70 ℃ and the heating capacity is insufficient.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas heat pump heating system.
The invention provides a gas heat pump heating system, which is arranged in a heating pipe network and used for outputting water supply after heating return water, and is characterized by comprising the following components: the system comprises a gas heat pump subsystem and a boiler subsystem, wherein the gas heat pump subsystem and the boiler subsystem are arranged in parallel, backwater is divided into a first branch and a second branch, water of the first branch flows into the gas heat pump subsystem, water of the second branch flows into the boiler subsystem, then the two branches of water are gathered and then output as supplied water, the gas heat pump subsystem and the boiler subsystem operate singly or jointly, the boiler subsystem comprises at least one hot water boiler, the gas heat pump subsystem comprises at least one gas heat pump unit, each gas heat pump unit comprises a gas engine, an engine waste heat exchange unit, a compressor, a condenser and an evaporator, the evaporator is one of an air-refrigerant heat exchanger or a water source water-refrigerant heat exchanger, refrigerant in the evaporator absorbs heat from air or water source water, and the gas engine drives the compressor to compress the refrigerant, the compressed refrigerant releases heat in the condenser, the engine waste heat exchange unit absorbs the waste heat of the gas engine to release heat, and the water of the first branch passes through the condenser and the engine waste heat exchange unit to absorb heat after heat exchange so as to heat up.
In the gas heat pump heating system provided by the invention, the gas heat pump heating system further has the following characteristics: wherein, T3Is ambient temperature, T4、T5Respectively, an ambient temperature limit value, T4The value range is-30 ℃ to-5 ℃, T5The value range is-10 ℃ to-35 ℃, when T is3＜T5When the system is in operation, the gas heat pump subsystem is not operated, and the boiler subsystem bears the heat supply load, and when T is reached5≤T3≤T4When the system is in full-load operation, the gas heat pump subsystem bears main heat supply load, the boiler subsystem bears partial heat supply load, and when T is reached3＞T4When the system is in operation, the gas heat pump subsystem is in full load operation, and the hot water boiler is not in operation.
In the gas heat pump heating system provided by the invention, the gas heat pump heating system further has the following characteristics: wherein the source water is one of seawater, sewage, wastewater and the like.
In the gas heat pump heating system provided by the invention, the gas heat pump heating system further has the following characteristics: wherein, engine waste heat transfer unit includes: the flue gas heat exchanger, the steam generator, a cylinder liner water pipeline, the intercooler, a cylinder liner water pump and the engine waste heat exchanger are sequentially connected with the flue gas heat exchanger, the cylinder liner of the gas engine, the engine waste heat exchanger, the intercooler and the flue gas heat exchanger, thereby forming a closed loop, the flue of the gas engine is communicated with the steam generator and the flue gas heat exchanger in turn, high-temperature flue gas generated by mixed combustion of gas and air in the gas engine flows through the steam generator to heat water in the steam generator to generate steam after passing through the flue, then flows through the flue gas heat exchanger, the cylinder liner water firstly flows through the flue gas heat exchanger in the cylinder liner water pipeline to be heated, then flows through the cylinder liner of the gas engine to be continuously heated, the water flows through the engine waste heat exchanger after being boosted by the cylinder liner water pump, heat is exchanged into the water of the first branch, and the water flows through the intercooler to the flue gas heat exchanger after being heated to complete a cycle.
In the gas heat pump heating system provided by the invention, the gas heat pump heating system further has the following characteristics: the intercooler is connected to a cylinder sleeve of the gas engine, and waste heat of the gas engine is used for heating cylinder sleeve water.
In the gas heat pump heating system provided by the invention, the gas heat pump heating system further has the following characteristics: wherein, the compressor is single-stage compression or multi-stage compression.
In the gas heat pump heating system provided by the invention, the gas heat pump heating system further has the following characteristics: wherein, the condenser and the waste heat exchanger are connected in series or in parallel.
In the gas heat pump heating system provided by the present invention, it may further have a feature that the gas heat pump heating system further includes: and the heat storage device is connected on a water supply pipeline after the gas-fired heat pump unit and the hot water boiler are connected in parallel.
In the gas heat pump heating system provided by the present invention, it may further have a feature that the gas heat pump heating system further includes: and the solar heat collector is connected with the heat storage device.
Action and Effect of the invention
According to the gas heat pump heat supply system, the two subsystems are arranged in parallel, and the gas heat pump subsystem and the boiler subsystem operate singly or jointly, so that when the heat supply capacity of the gas heat pump unit is insufficient, the hot water boiler is started to supply heat in an auxiliary mode, the heat supply capacity of the whole system is improved, and the system is higher in heat efficiency and higher in outlet water temperature compared with a device for preparing hot water by using the boiler and the absorption heat pump together.
Furthermore, the gas heat pump subsystem comprises a gas heat pump unit, refrigerant in an evaporator of the gas heat pump unit absorbs heat from air or water source water, the gas engine drives the compressor to compress the refrigerant, the compressed refrigerant releases heat in the condenser, the engine waste heat exchange unit absorbs waste heat of the gas engine to release heat, return water entering the gas heat pump subsystem can absorb heat of the condenser and the engine waste heat exchange unit to output water supply, and gas consumption is reduced by 50% to 62% compared with a water heating boiler which is operated independently. The heat supply efficiency is obviously improved.
Drawings
FIG. 1 is a schematic flow chart of a gas heat pump heating system according to a first embodiment of the present invention;
FIG. 2 is a schematic flow chart of heating of the engine waste heat exchange unit in the first embodiment of the invention;
FIG. 3 is a schematic diagram of a start-up sequence of a gas heat pump subsystem and a boiler subsystem in a first embodiment of the present invention;
FIG. 4 is a schematic diagram of another start-up sequence of the gas heat pump subsystem and the boiler subsystem in the first embodiment of the present invention;
FIG. 5 is a schematic connection flow diagram of a condenser and an engine waste heat exchange unit according to a second embodiment of the present invention;
FIG. 6 is a schematic connection flow diagram of a condenser and an engine waste heat exchange unit in the third embodiment of the invention;
FIG. 7 is a schematic connection flow diagram of a condenser and an engine waste heat exchange unit according to a fourth embodiment of the invention;
fig. 8 is a schematic connection flow diagram of the condenser and the engine waste heat exchange unit in the fifth embodiment of the invention.
Description of the figure numbering: 1. the system comprises a gas engine, 2, a compressor, 3, an engine waste heat exchange unit, 3a, a first engine waste heat exchange unit, 3b, a second engine waste heat exchange unit, 4, a condenser, 4a, a first condenser, 4b, a second condenser, 5, an evaporator, 6, a gas heat pump unit, 8, a hot water boiler, 10, a heat storage device, 11, a valve, 12, a flue gas heat exchanger, 13, a steam generator, 14, a cylinder liner water pipeline, 15, an intercooler, 16, a cylinder liner water pump, 17, an engine waste heat exchanger, 18, a solar heat collector, 19, a circulating water pump, 20 and a heat collection pump.
Detailed Description
In order to make the technical means, creation features, achievement objects and effects of the invention easy to understand, the following embodiments are specifically described with reference to the accompanying drawings.
< example one >
The embodiment provides a gas heat pump heating system.
Fig. 1 is a schematic flow chart of a gas heat pump heating system according to a first embodiment of the present invention.
As shown in fig. 1, the gas heat pump heating system 1000 according to the present embodiment is provided in a heat supply pipe network, and is capable of heating and raising the temperature of return water of the heat supply pipe network to obtain high-temperature hot water, and outputting the high-temperature hot water as supply water, and includes a return water line, a gas heat pump subsystem 100, a boiler subsystem 200, a heat storage subsystem 300, and a water supply line. The gas heat pump subsystem 100 includes at least one gas heat pump unit 6, and the boiler subsystem 200 includes at least one hot water boiler 8. In the present embodiment, the gas heat pump subsystem 100 includes a gas heat pump unit 6.
The gas heat pump unit 6 is connected in parallel with the hot water boiler 8. When the number of the hot water boilers 8 is plural, the plural hot water boilers 8 are connected in parallel. The number of starts of the hot water boiler 8 and the output of the individual boiler are adjusted according to the outdoor ambient temperature. In the present embodiment, only one gas-heat pump unit 6 and one hot water boiler 8 are taken as an example for detailed description.
The gas heat pump unit 6 comprises a gas engine 1, a compressor 2, an engine waste heat exchange unit 3, a condenser 4 and an evaporator 5.
The evaporator 5 is an air-refrigerant heat exchanger or a source water-refrigerant heat exchanger. The refrigerant in the evaporator 5 absorbs heat from the air or water supply. The source water is one of seawater, sewage, wastewater and the like.
The engine waste heat exchange unit 3 and the condenser 4 are connected in series or in parallel and then connected to a water return pipeline and a water supply pipeline. In this embodiment, the engine waste heat exchanging unit 3 is connected in series with the condenser 4 (as shown in fig. 1), and the return water flowing to the gas heat pump unit 6 in the return water pipeline flows through the condenser 4, then flows through the engine waste heat exchanging unit 3, and finally flows into the water supply pipeline.
The gas engine 1 can drive the compressor 2 to compress the refrigerant, and the compressed refrigerant releases heat in the condenser 4, so that the return water is heated. The compressor 2 is any one of an open-type screw compressor, an open-type magnetic suspension centrifugal compressor and an open-type scroll compressor.
FIG. 2 is a schematic flow chart of heating of the engine waste heat exchange unit in the first embodiment of the invention;
as shown in fig. 2, the engine waste heat exchanging unit 3 is configured to exchange heat by using waste heat of the gas engine 1, so as to heat return water, and includes a flue gas heat exchanger 12, a steam generator 13, a cylinder liner water pipeline 14, an intercooler 15, a cylinder liner water pump 16, and an engine waste heat exchanger 17.
The cylinder liner water pipeline 14 is connected with the flue gas heat exchanger 12, the cylinder liner of the gas engine 1, the engine waste heat exchanger 17, the intercooler 15 and the flue gas heat exchanger 12 in sequence, so that a closed loop is formed.
The flue of the gas engine 1 is in turn in communication with a steam generator 13 and a flue gas heat exchanger 12. High-temperature flue gas generated after mixed combustion of fuel gas and air in the gas engine 1 firstly flows through the steam generator 13 through the flue so as to heat water in the steam generator to generate steam, and the steam can be used for disinfection, drying, process heating and the like. The remaining flue gas then flows through the flue gas heat exchanger 12, dissipating a portion of the flue gas waste heat into the cylinder liner water.
The cylinder liner water firstly flows through the flue gas heat exchanger 12 in the cylinder liner water pipeline 14 to be heated, then flows through the cylinder liner of the gas engine 1 to be continuously heated, then flows through the engine waste heat exchanger 17 after being boosted by the cylinder liner water pump 16, and exchanges heat at the engine waste heat exchanger 17, so that the return water is heated, and then flows through the intercooler 15 to be heated and flows back to the flue gas heat exchanger 12 to finish a cycle. The intercooler 15 is connected to the cylinder liner of the gas engine 1, and heats the cylinder liner water by using the waste heat of the gas engine 1. The flue gas heat exchanger 12 is one of a plate-shell type heat exchanger, a plate-fin type heat exchanger, and a fin-tube type heat exchanger.
Return water temperature T in return water pipeline1The temperature of the water is 40-50 ℃, the return water is divided into two paths, one path of return water flows into the gas heat pump unit 6, the other path of return water enters the hot water boiler 8, the gas heat pump unit 6 is started preferentially, the return water enters the condenser 4 to be heated firstly, and then flows into the engine waste heat exchange unit 3 to be heated continuously. When the heat supply capacity of the gas heat pump unit 6 is insufficient, the hot water boiler 8 starts to supply heat, and the return water flows into the hot water boiler 8 to absorb heat and raise the temperature. The two paths of heated water are gathered and then output as water supply through a water supply pipeline. Wherein, the gas heat pump unit 6 runs continuously and bears main heat load, and the hot water boiler 8 is used for supplying heat and supplementing heat, thereby ensuring the high-efficiency operation of the system.
Fig. 3 is a schematic diagram of the start-up sequence of the gas heat pump subsystem and the boiler subsystem in the first embodiment of the present invention. Fig. 4 is a schematic diagram of another startup sequence of the gas heat pump subsystem and the boiler subsystem in the first embodiment of the present invention.
In FIGS. 3 and 4, T3Is ambient temperature, T4、T5Respectively, an ambient temperature limit value, T4The value range is-30 ℃ to-5 ℃, T5The value range is-10 ℃ to-35 ℃.
As shown in fig. 3, when the ambient temperature T is reached3Less than T5In time, the heating capacity Q of the gas heat pump unit 61Far below the heating load Q2At this time, the gas heat pump unit 6 is not operated, and the hot water boiler 8 takes a heat supply load, and the heat supply load of the hot water boiler 8 is shown by a shaded portion in fig. 3.
As shown in fig. 4, when the ambient temperature T is reached3At T5And T4In the meantime, the heating capacity Q of the gas heat pump unit 61Lower than the heating load Q2At this time, the gas heat pump unit 6 is fully opened to bear the main heat supply load, the hot water boiler 8 bears part of the heat supply load, and the part of the heat supply load borne by the hot water boiler 8 is shown by the shaded part in fig. 4.
When the ambient temperature T3Greater than T4In the meantime, as shown in FIG. 4, the heating capacity Q of the gas heat pump unit 61Higher than heating load Q2Herein, thisWhen the gas heat pump unit 6 is fully opened, all heat supply loads are borne, and the hot water boiler 8 does not operate.
As shown in fig. 1, the heat storage subsystem 300 connected in parallel to the gas heat pump subsystem 100 includes a heat storage device 10, a valve 11, a solar heat collector 18, a circulating water pump 19, and a heat collection pump 20.
The heat storage device 10 is connected to the return line by two parallel lines, a valve 11 is provided on one of the lines, and a circulating water pump 19 is provided on the other line. The solar heat collector 18 is connected to the heat storage device 10 via a heat collection pump 20.
The gas heat pump sub-system 100 and the boiler sub-system 200 may store heat and release heat together or separately, and the following description will take the gas heat pump sub-system 100 as an example to store heat and release heat separately, and the others are similar to the above.
During the hot peak, the thermal storage device 10 operates in the thermal storage mode, in which the circulating water pump 19 is turned on and the valve 11 is closed. The return water firstly enters the gas heat pump cold and hot water subsystem 100, absorbs heat in the first heat exchanger 4 and the engine waste heat exchange unit 3 to raise the temperature, and then flows into the heat storage device 10 to store heat. In addition, under the working condition of sunny days, the backwater absorbs heat in the solar heat collector 18 to raise the temperature, and finally flows into the heat storage device 10 to store heat.
During the peak period of heat consumption, the heat storage device 10 operates in a heat supply mode, at this time, the circulating water pump 19 is closed, the valve 11 is opened, and hot water in the heat storage device 10 is output for heat supply, so that the heat supply process of the heat storage device 10 is completed.
In the present embodiment, the gas heat pump heating system 1000 includes the heat storage subsystem 300, and the heat storage subsystem 300 includes the solar heat collector 18, in the modification (modification one) of the present embodiment, the heat storage subsystem may not include the solar heat collector, and other structures are completely the same as the present embodiment; in a modification (modification two) of the present embodiment, the gas heat pump heating system may not include a heat storage subsystem, and the other configurations are completely the same as those of the present embodiment.
< example two >
The present embodiment provides a gas heat pump heating system, which is different from the gas heat pump heating system 1000 in the first embodiment in that the gas heat pump subsystem includes a plurality of gas heat pump units.
Fig. 5 is a schematic connection flow diagram of the condenser and the engine waste heat exchange unit in the second embodiment of the invention.
The gas heat pump subsystem in this embodiment includes two gas heat pump units, and correspondingly, as shown in fig. 5, includes a first condenser 4a, a second condenser 4b, a first engine waste heat exchange unit 3a, and a second engine waste heat exchange unit 3 b.
Return water (T)1) The waste heat passes through the first condenser 4a, the first engine waste heat exchange unit 3a, the second condenser 4b and the second engine waste heat exchange unit 3b in sequence to be heated, and then hot water (T) is output2)。
The other structures in this embodiment are the same as those in the first embodiment.
In this embodiment, the gas heat pump subsystem includes two gas heat pump units, and in the modification (modification three) of this embodiment, the gas heat pump subsystem includes two or more gas heat pump units, and the connection manner between the plurality of condensation pipes and the plurality of engine waste heat exchange units is the same as that of this embodiment, that is, the return water (T;) is1) Sequentially flows through a condenser and an engine waste heat exchange unit of the first gas heat pump unit, a condenser and an engine waste heat exchange unit of the second gas heat pump unit, … …, and a condenser and an engine waste heat exchange unit of the last gas heat pump unit, and then is heated to output hot water (T)2)。
The starting number and the output of the gas heat pump units are adjusted according to the outdoor environment temperature.
< example three >
This embodiment provides a gas heat pump heating system, and the difference between this gas heat pump heating system and the gas heat pump heating system of embodiment two lies in only: the two condensers and the two engine waste heat exchange units are different in series connection mode. The other structure is the same as the embodiment.
Fig. 6 is a schematic connection flow diagram of the condenser and the engine waste heat exchange unit in the third embodiment of the invention.
As shown in fig. 6, the gas heat pump sub-system in the present embodiment includes: the system comprises a first condenser 4a, a second condenser 4b, a first engine waste heat exchange unit 3a and a second engine waste heat exchange unit 3 b. Temperature of T1The water flows through a first condenser 4a, a second condenser 4b, a first engine waste heat exchange unit 3a and a second engine waste heat exchange unit 3b in sequence for heating, and then the output temperature is T2The water of (2).
In this embodiment, the gas heat pump subsystem includes two gas heat pump units, and in the modification (modification four) of this embodiment, the gas heat pump subsystem includes two or more gas heat pump units, and the connection manner between the plurality of condensation pipes and the plurality of engine waste heat exchange units is the same as that of this embodiment, that is, the temperature is T1After flowing through each condenser in sequence, the water flows through each engine waste heat exchange unit in sequence for heating, and then the output temperature is T2The water of (2).
< example four >
This embodiment provides a gas heat pump heating system, and the difference between this gas heat pump heating system and the gas heat pump heating system of embodiment two lies in only: the two condensers and the two engine waste heat exchange units are connected in different modes. The other structure is the same as the embodiment.
Fig. 7 is a schematic connection flow diagram of a condenser and an engine waste heat exchange unit in the fourth embodiment of the invention.
As shown in fig. 7, the gas heat pump sub-system in the present embodiment includes: the system comprises a first condenser 4a, a second condenser 4b, a first engine waste heat exchange unit 3a and a second engine waste heat exchange unit 3 b. Temperature of T1The water is divided into two paths, one path of water flows through a first condenser 4a and a first engine waste heat exchange unit 3a for heating, the other path of water flows through a second condenser 4b and a second engine waste heat exchange unit 3b for heating, and the two paths of water are converged to output the temperature of T2The water of (2).
In this embodiment, the gas heat pump subsystem includes two gas heat pump units, which is a variant of this embodimentIn the fifth embodiment (modification example), the gas heat pump subsystem includes more than two gas heat pump units, and the connection manner between the plurality of condensation pipes and the plurality of engine waste heat exchange units is the same as that in the present embodiment, that is, the temperature is T1The water is in multiple paths, each path sequentially flows through a condenser of a gas heat pump unit and an engine waste heat exchange unit for heating, and the output temperature of each path after convergence is T2The water of (2).
< example five >
This embodiment provides a gas heat pump heating system, and the difference between this gas heat pump heating system and the gas heat pump heating system of embodiment two is only: the two condensers and the two engine waste heat exchange units are connected in different modes. The other structure is the same as the embodiment.
Fig. 8 is a schematic connection flow diagram of the condenser and the engine waste heat exchange unit in the fifth embodiment of the invention.
As shown in fig. 8, the gas heat pump sub-system in the present embodiment includes: the system comprises a first condenser 4a, a second condenser 4b, a first engine waste heat exchange unit 3a and a second engine waste heat exchange unit 3 b. Two condensers and two engine waste heat exchange units are connected in parallel one by one, namely, the temperature is T1The water is divided into four paths, the first path flows through a first condenser 4a for heating, the second path flows through a second condenser 4b for heating, the third path flows through a first engine waste heat exchange unit 3a for heating, the fourth path flows through a second engine waste heat exchange unit 3b for heating, and the output temperature is T after the four paths are converged2The water of (2).
In this embodiment, the gas heat pump subsystem includes two gas heat pump units, and in a modification (modification six) of this embodiment, the gas heat pump subsystem includes two or more gas heat pump units, and the connection mode between the plurality of condensation pipes and the plurality of engine waste heat exchange units is the same as that in this embodiment, that is, each condenser and each engine waste heat exchange unit are connected in parallel one by one.
Effects and effects of the embodiments
According to the gas heat pump heating system related to the first embodiment, the gas heat pump subsystem and the boiler subsystem are arranged in parallel, and the gas heat pump subsystem and the boiler subsystem operate singly or jointly, so that when the gas heat pump unit is insufficient in heating capacity, the hot water boiler is started to perform auxiliary heating, the heating capacity of the whole system is improved, and compared with a device for preparing hot water by using a boiler and an absorption heat pump together, the system is higher in heat efficiency and higher in outlet water temperature.
Furthermore, the gas heat pump subsystem comprises a gas heat pump unit, refrigerant in an evaporator of the gas heat pump unit absorbs heat from air or water source water, the gas engine drives the compressor to compress the refrigerant, the compressed refrigerant releases heat in the condenser, the engine waste heat exchange unit absorbs waste heat of the gas engine to release heat, return water entering the gas heat pump subsystem can absorb heat of the condenser and the engine waste heat exchange unit to output water supply, and gas consumption is reduced by 50% to 62% compared with a water heating boiler which is operated independently. The heat supply efficiency is obviously improved.
Further, because engine waste heat exchange unit includes: the high-temperature flue gas after combustion in the gas engine passes through the flue and then flows through the steam generator to heat water in the steam generator to generate steam, then flows through the flue gas heat exchanger, the cylinder sleeve water flows through the flue gas heat exchanger in the cylinder sleeve water pipeline to heat, then flows through the cylinder sleeve of the gas engine to continue heating, and after being boosted by the cylinder sleeve water pump, the cylinder sleeve water flows through the engine waste heat exchanger to transfer heat to return water, so that the engine waste heat exchange unit can fully utilize the waste heat of the gas engine to provide heat.
Further, because the heat accumulator is connected to a water supply pipeline after the gas heat pump unit and the hot water boiler are connected in parallel, the heat accumulation circulation of the heat accumulator is started during the heat consumption peak period, and the heat accumulator participates in heat supply when the demand of the heat supply peak is insufficient. The solar heat collector is connected with the heat accumulator, so that heat accumulation can be assisted.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention. 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, all of which fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a gas heat pump heating system for set up in the heat supply pipe network, output after heating up the return water and supply water, its characterized in that includes:
the gas heat pump subsystem and the boiler subsystem are arranged in parallel, the backwater is divided into a first branch and a second branch, the water of the first branch flows into the gas heat pump subsystem, the water of the second branch flows into the boiler subsystem, and then the two branches of water are converged and output as the supplied water,
the gas heat pump subsystem and the boiler subsystem are operated singly or together,
wherein the boiler subsystem comprises at least one hot water boiler,
the gas heat pump subsystem comprises at least one gas heat pump unit, each gas heat pump unit comprises a gas engine, an engine waste heat exchange unit, a compressor, a condenser and an evaporator,
the evaporator is one of an air-refrigerant heat exchanger or a water source water-refrigerant heat exchanger, refrigerant in the evaporator absorbs heat from air or water source water, the gas engine drives the compressor to compress the refrigerant, the compressed refrigerant releases heat in the condenser,
the engine waste heat exchange unit absorbs the waste heat of the gas engine to release heat,
and water of the first branch passes through the condenser and the engine waste heat exchange unit, and absorbs heat to raise the temperature after heat exchange.
2. The gas heat pump heating system according to claim 1, wherein:
wherein, T3Is ambient temperature, T4、T5Respectively, an ambient temperature limit value, T4The value range is-30 ℃ to-5 ℃, T5The value range is-10 ℃ to-35 ℃,
when T is3＜T5When the gas heat pump subsystem does not operate, the boiler subsystem bears the heat supply load,
when T is5≤T3≤T4When the system is in full-load operation, the gas heat pump subsystem bears main heat supply load, the boiler subsystem bears partial heat supply load,
when T is3＞T4And when the system is in operation, the gas heat pump subsystem is in full load operation, and the hot water boiler is not in operation.
3. The gas heat pump heating system according to claim 1, wherein:
wherein the source water is one of seawater, sewage, wastewater and the like.
4. The gas heat pump heating system according to claim 1, wherein:
wherein, engine waste heat transfer unit includes: a flue gas heat exchanger, a steam generator, a cylinder liner water pipeline, an intercooler, a cylinder liner water pump and an engine waste heat exchanger,
the cylinder sleeve water pipeline is sequentially connected with the flue gas heat exchanger, the cylinder sleeve of the gas engine, the engine waste heat exchanger, the intercooler and the flue gas heat exchanger to form a closed loop,
the flue of the gas engine is sequentially communicated with the steam generator and the flue gas heat exchanger, high-temperature flue gas generated by mixed combustion of gas and air in the gas engine flows through the flue, then flows through the steam generator to heat water in the steam generator to generate steam, and then flows through the flue gas heat exchanger,
the cylinder liner water firstly flows through the smoke heat exchanger in the cylinder liner water pipeline to be heated, then flows through the cylinder liner of the gas engine to be continuously heated, is boosted by the cylinder liner water pump and then flows through the engine waste heat exchanger to exchange heat to the water of the first branch, then flows through the intercooler to be heated and then flows to the smoke heat exchanger to complete a cycle.
5. The gas heat pump heating system according to claim 4, wherein:
the intercooler is connected to the cylinder sleeve of the gas engine, and the waste heat of the gas engine is used for heating the cylinder sleeve water.
6. The gas heat pump heating system according to claim 1, wherein:
wherein, the compressor is single-stage compression or multi-stage compression.
7. The gas heat pump heating system according to claim 1, wherein:
wherein the condenser and the waste heat exchanger are connected in series or in parallel.
8. The gas heat pump heating system according to claim 1, further comprising:
and the heat accumulator is connected to a water supply pipeline after the gas heat pump unit and the hot water boiler are connected in parallel.
9. The gas heat pump heating system according to claim 1, further comprising:
and the solar heat collector is connected with the heat storage device.
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