CN114576693B - Gas heat pump heating system - Google Patents
Gas heat pump heating system Download PDFInfo
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- CN114576693B CN114576693B CN202011373735.0A CN202011373735A CN114576693B CN 114576693 B CN114576693 B CN 114576693B CN 202011373735 A CN202011373735 A CN 202011373735A CN 114576693 B CN114576693 B CN 114576693B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 176
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 150
- 239000002918 waste heat Substances 0.000 claims abstract description 89
- 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 17
- 239000003546 flue gas Substances 0.000 claims description 17
- 239000000779 smoke Substances 0.000 claims description 16
- 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
- 239000002351 wastewater Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims 1
- 238000005338 heat storage Methods 0.000 description 19
- 238000010586 diagram Methods 0.000 description 14
- 238000012986 modification Methods 0.000 description 14
- 230000004048 modification Effects 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000009825 accumulation Methods 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
- 230000005855 radiation Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 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
- 238000012546 transfer Methods 0.000 description 1
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
Landscapes
- 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 used for being arranged in a heating pipe network to heat backwater and output water supply, and is characterized by comprising the following components: the system comprises a gas heat pump subsystem and a boiler subsystem which are arranged in parallel, wherein the water return is divided into a first branch which flows into the gas heat pump subsystem and a second branch which flows into a boiler system, the two subsystems are operated singly or jointly, each 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 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 is discharged in the condenser, the engine waste heat exchange unit absorbs waste heat of the gas engine to release heat, and the water of the first branch flows through the condenser and the engine waste heat exchange unit to absorb heat after heat exchange to raise the temperature.
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 its heat energy comes from the heat of combustion of fuel. At present, with the implementation of sustainable development strategy, the continuous enhancement of energy conservation and environmental protection consciousness and the promotion of the northern winter heating coal-to-gas policy, boiler heating can not meet the social needs.
The 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, heat radiation equipment, a constant-pressure water supplementing device, a connecting pipeline and the like, wherein the heat pump and the boiler are connected in series in the heating system. In actual operation, the heat medium is heated by the heat pump, then heated by the boiler, the heat pump bears the basic heat load, and the boiler bears the 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, wherein the device uses the boiler and an absorption heat pump unit in combination, hot water or steam generated by the boiler is used as a driving heat source of the absorption heat pump unit, and 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 sent 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 the northern winter cold season when the air temperature is low; in addition, the device is difficult to provide hot water with a temperature higher than 70 ℃ and has insufficient heating capacity.
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 used for being arranged in a heating pipe network to heat backwater and output water supply, and is characterized by comprising the following components: the gas heat pump subsystem and the boiler subsystem are arranged in parallel, water returning is divided into a first branch and a second branch, water in the first branch flows into the gas heat pump subsystem, water in the second branch flows into the boiler system, then the two branches flow into the boiler system and are converged to be output as water supply, the gas heat pump subsystem and the boiler subsystem singly run or jointly run, 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, the 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 waste heat of the gas engine to release heat, and the water in the first branch flows through the condenser and the engine waste heat exchange unit to absorb heat to heat and heat to heat.
In the gas heat pump heating system provided by the invention,it may also have the following features: wherein T is 3 At ambient temperature, T 4 、T 5 Respectively are the limit values of the ambient temperature, T 4 The value range is-30 ℃ to-5 ℃, T 5 The value range is-10 ℃ to-35 ℃ and when T is 3 ＜T 5 When the gas heat pump subsystem is not in operation, the boiler subsystem bears the heat supply load, when T 5 ≤T 3 ≤T 4 When the gas heat pump subsystem is in full load operation, the main heat supply load is borne, the boiler subsystem is borne as part of the heat supply load, when T 3 ＞T 4 When the gas heat pump subsystem runs at full load, the hot water boiler does not run.
In the gas heat pump heating system provided by the invention, the system can also have 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 system can also have the following characteristics: wherein, engine waste heat exchange unit includes: the system comprises a smoke heat exchanger, a steam generator, a cylinder liner water pipeline, an intercooler, a cylinder liner water pump and an engine waste heat exchanger, wherein the cylinder liner water pipeline is sequentially connected with the smoke heat exchanger, a cylinder liner of the gas engine, the engine waste heat exchanger, the intercooler and the smoke heat exchanger, so that a closed loop is formed, a flue of the gas engine is sequentially communicated with the steam generator and the smoke heat exchanger, high-temperature smoke generated by mixed combustion of fuel gas and air 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 smoke heat exchanger, cylinder liner water firstly flows through the smoke heat exchanger in the cylinder liner water pipeline to heat, then flows through the cylinder liner of the gas engine to continue to heat, and flows through the engine waste heat exchanger after being boosted by the cylinder liner water pump to exchange heat into water of a first branch, and flows through the intercooler to heat the smoke heat exchanger to complete a cycle.
In the gas heat pump heating system provided by the invention, the system can also have the following characteristics: the intercooler is connected to a cylinder sleeve of the gas engine, and the residual heat of the gas engine is utilized to heat the cylinder sleeve water.
In the gas heat pump heating system provided by the invention, the system can also have 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 system can also have the following characteristics: wherein, condenser and waste heat exchanger connect in series or parallel.
In the gas heat pump heating system provided by the invention, the characteristics can be further provided, and the gas heat pump heating system further comprises: and the heat storage device is connected to a water supply pipeline after the gas heat pump unit and the hot water boiler are connected in parallel.
In the gas heat pump heating system provided by the invention, the characteristics can be further provided, and the gas heat pump heating system further comprises: and the solar heat collector is connected with the heat storage device.
Effects and effects 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 and auxiliary heat supply is performed, the heat supply capacity of the whole system is improved, and the system has higher heat efficiency and higher water outlet temperature than a device for preparing hot water by utilizing the boiler and the absorption heat pump together.
Further, the gas heat pump subsystem comprises a gas heat pump unit, the refrigerant in the 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 is discharged in the condenser, the engine waste heat exchange unit absorbs waste heat of the gas engine to release heat, and backwater entering the gas heat pump subsystem can absorb heat of the condenser and the engine waste heat exchange unit to output water supply, so that the fuel consumption is reduced by 50-62% compared with that of a single operation hot water boiler. The heating efficiency is remarkably improved.
Drawings
FIG. 1 is a schematic flow chart of a gas heat pump heating system according to a first embodiment of the invention;
FIG. 2 is a schematic diagram of a flow path for heating an engine waste heat exchange unit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a start-up sequence for a gas heat pump subsystem and a boiler subsystem in accordance with an embodiment of the present invention;
FIG. 4 is another schematic diagram of a start-up sequence for a gas heat pump subsystem and a boiler subsystem in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a second embodiment of the present invention;
FIG. 6 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a third embodiment of the present invention;
FIG. 7 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a fourth embodiment of the present invention;
fig. 8 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a fifth embodiment of the present invention.
Description of the drawings: 1. the heat pump 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 collecting pump.
Detailed Description
In order to make the technical means, creation characteristics, achievement purposes and effects achieved by the present invention easy to understand, the following embodiments are specifically described with reference to the accompanying drawings.
Example 1
The embodiment provides a gas heat pump heating system.
Fig. 1 is a schematic flow chart of a heat supply system of a gas heat pump according to an embodiment of the invention.
As shown in fig. 1, the gas heat pump heat supply system 1000 in this embodiment is disposed 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 water supply, where the system includes a water return pipeline, a gas heat pump subsystem 100, a boiler subsystem 200, a heat storage subsystem 300, and a water supply pipeline. The gas heat pump subsystem 100 comprises at least one gas heat pump unit 6 and the boiler subsystem 200 comprises at least one hot water boiler 8. In this embodiment the gas heat pump subsystem 100 comprises a gas heat pump unit 6.
The gas heat pump unit 6 is arranged in parallel with the hot water boiler 8. When the number of hot water boilers 8 is plural, the plural hot water boilers 8 are connected in parallel. The number of starts and individual outputs of the hot water boiler 8 are adjusted according to the outdoor ambient temperature. In this embodiment, only one gas heat pump unit 6 and one hot water boiler 8 will be described in detail.
The gas heat pump unit 6 includes 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 source water. The source water is one of seawater, sewage, wastewater and the like.
The engine waste heat exchange unit 3 is connected with the condenser 4 in series or in parallel and then is connected with a water return pipeline and a water supply pipeline. In this embodiment, the engine waste heat exchange 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 exchange 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. Wherein, the compressor 2 is any one of an open screw compressor, an open magnetic suspension centrifugal compressor and an open vortex compressor.
FIG. 2 is a schematic diagram of a flow path for heating an engine waste heat exchange unit according to a first embodiment of the present 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 backwater, 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 sequentially connected with the smoke heat exchanger 12, the cylinder liner of the gas engine 1, the engine waste heat exchanger 17, the intercooler 15 and the smoke heat exchanger 12, 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. The high-temperature flue gas generated after the mixed combustion of the fuel gas and the air in the fuel gas engine 1 flows through the steam generator 13 through the flue so as to heat the 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, distributing a portion of the flue gas waste heat to the cylinder liner water.
The cylinder liner water firstly flows through the smoke heat exchanger 12 in the cylinder liner water pipeline 14 for heating, then flows through the cylinder liner of the gas engine 1 for continuously heating, 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 the cylinder liner water flows back to the smoke heat exchanger 12 after being heated by the intercooler 15 for completing a cycle. The intercooler 15 is connected to a cylinder liner of the gas engine 1, and heats cylinder liner water by using 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.
Backwater temperature T in backwater pipeline 1 The temperature is 40-50 ℃, the backwater is divided into two paths, one path of backwater flows into the gas heat pump unit 6, the other path of backwater flows into the hot water boiler 8, the gas heat pump unit 6 is firstly started, the backwater firstly flows into the condenser 4 for heating, and then flows into the engine waste heat exchange unit 3 for continuous heating. When the heat supply capacity of the gas heat pump unit 6 is insufficient, the hot water boiler 8 starts to supply heat, and backwater flows into the hot water boiler 8 to absorb heat and raise temperature. The two paths of heated water are converged and then output as water supply through a water supply pipeline. Wherein, the gas heat pump unit 6 runs continuously and bears main heat burdenThe hot water boiler 8 is used for supplying heat and supplementing heat, and can ensure the high-efficiency operation of the system.
Fig. 3 is a schematic diagram of a start-up sequence of a gas heat pump subsystem and a boiler subsystem in accordance with a first embodiment of the present invention. Fig. 4 is a schematic diagram of another start-up sequence for a gas heat pump subsystem and a boiler subsystem in accordance with an embodiment of the present invention.
In FIGS. 3 and 4, T 3 At ambient temperature, T 4 、T 5 Respectively are the limit values of the ambient temperature, T 4 The value range is-30 ℃ to-5 ℃, T 5 The value range is-10 ℃ to-35 ℃.
As shown in FIG. 3, when the ambient temperature T 3 Less than T 5 Heating capacity Q of gas heat pump unit 6 1 Far below the heating load Q 2 At this time, the gas heat pump unit 6 is not operated, and the hot water boiler 8 is charged with the heat load, and the heat load charged by the hot water boiler 8 is shown in a hatched portion in fig. 3.
As shown in FIG. 4, when the ambient temperature T 3 At T 5 And T is 4 In between, the heating capacity Q of the gas heat pump unit 6 1 Below the heating load Q 2 At this time, the gas heat pump unit 6 is fully opened and is charged with the main heating load, the hot water boiler 8 is charged with a part of the heating load, and the part of the heating load charged by the hot water boiler 8 is shown as a hatched part in fig. 4.
When the ambient temperature T 3 Greater than T 4 At this time, as shown in FIG. 4, the heating capacity Q of the gas heat pump unit 6 1 Above the heating load Q 2 At this time, the gas heat pump unit 6 is fully opened to bear the whole heat supply load, and the hot water boiler 8 does not operate.
As shown in fig. 1, the heat storage subsystem 300 is connected in parallel to the gas heat pump subsystem 100 and includes a heat storage device 10, a valve 11, a solar heat collector 18, a circulating water pump 19, and a heat collecting pump 20.
The heat storage device 10 is connected to the water return line through two parallel lines, the valve 11 is provided on one of the lines, and the circulating water pump 19 is provided on the other of the lines. The solar heat collector 18 is connected to the heat storage device 10 via a heat collecting pump 20.
The gas heat pump subsystem 100 and the boiler subsystem 200 may store heat and release heat together or separately, and the following description will describe the gas heat pump subsystem 100 alone as an example, and the others are similar.
During the low peak period of heat consumption, the heat storage device 10 operates in a heat storage mode, and the circulating water pump 19 is opened and the valve 11 is closed. The backwater firstly enters the gas heat pump cold and hot Shui Zi system 100, absorbs heat in the first heat exchanger 4 and the engine waste heat exchange unit 3 to raise 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 heat up, and finally flows into the heat storage device 10 to store heat.
During the heat utilization peak period, the heat storage device 10 operates in a heat supply mode, at the moment, the circulating water pump 19 is closed, the valve 11 is opened, hot water in the heat storage device 10 outputs heat for supplying, and the heat supply process of the heat storage device 10 is completed.
In this 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, and in a modification (modification one) of this embodiment, the heat storage subsystem may not include the solar heat collector, and other structures are identical to those of this embodiment; in a modification (modification two) of the present embodiment, the gas heat pump heating system may not include a heat storage subsystem, and other structures are identical to those of the present embodiment.
< example two >
The present embodiment provides a gas heat pump heat supply system, which is different from the gas heat pump heat supply 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 diagram of a connection flow of a condenser and an engine waste heat exchange unit in a second embodiment of the present invention.
The gas heat pump subsystem in this embodiment includes two gas heat pump units, and correspondingly includes, as shown in fig. 5, 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.
Backwater (T) 1 ) Sequentially through a first condenserThe heater 4a, the first engine residual heat exchanging unit 3a, the second condenser 4b, and the second engine residual heat exchanging unit 3b heat and then output hot water (T 2 )。
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 a 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 1 ) Flows through the condenser and the engine waste heat exchange unit of the first gas heat pump unit in sequence, the condenser and the engine waste heat exchange unit of the second gas heat pump unit, … …, and the condenser and the engine waste heat exchange unit of the last gas heat pump unit are heated and then output hot water (T 2 )。
The starting number and the single output of the gas heat pump unit are adjusted according to the outdoor environment temperature.
Example III
The present embodiment provides a gas heat pump heat supply system, which differs from the gas heat pump heat supply system of the second embodiment only in that: the two condensers and the two engine waste heat exchange units are connected in series in different manners. Other structures are the same as the embodiment.
Fig. 6 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a third embodiment of the present invention.
As shown in fig. 6, the gas heat pump subsystem in the present embodiment includes: the first condenser 4a, the second condenser 4b, the first engine waste heat exchange unit 3a and the second engine waste heat exchange unit 3b. At a temperature T 1 The water flows through the first condenser 4a, the second condenser 4b, the first engine waste heat exchange unit 3a and the second engine waste heat exchange unit 3b in sequence to be heated, and then the output temperature is T 2 Is a water source.
In this embodiment, the gas heat pump subsystem includes two gas heat pump units, and in a modification (modification four) of this embodiment,the gas heat pump subsystem comprises more than two gas heat pump units, and the connection mode between a plurality of condensing pipes and a plurality of engine waste heat exchange units is the same as that of the embodiment, namely, the temperature is T 1 After the water sequentially flows through the condensers, the water sequentially flows through the waste heat exchange units of the engines to be heated, and the output temperature is T 2 Is a water source.
Example IV
The present embodiment provides a gas heat pump heat supply system, which differs from the gas heat pump heat supply system of the second embodiment only in that: the connection modes between the two condensers and the two engine waste heat exchange units are different. Other structures are the same as the embodiment.
Fig. 7 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a fourth embodiment of the present invention.
As shown in fig. 7, the gas heat pump subsystem in the present embodiment includes: the first condenser 4a, the second condenser 4b, the first engine waste heat exchange unit 3a and the second engine waste heat exchange unit 3b. At a temperature T 1 One water part sequentially flows through the first condenser 4a and the first engine waste heat exchange unit 3a for heating, the other water part sequentially flows through the second condenser 4b and the second engine waste heat exchange unit 3b for heating, and the output temperature after the two water parts are converged is T 2 Is a water source.
In this embodiment, the gas heat pump subsystem includes two gas heat pump units, and in a modification (modification five) of this embodiment, 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 of this embodiment, that is, the temperature is T 1 The water content of the water heater is divided into 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 is T after the paths are converged 2 Is a water source.
< example five >
The present embodiment provides a gas heat pump heat supply system, and the difference between the gas heat pump heat supply system and the gas heat pump heat supply system of the second embodiment is that: the connection modes of the two condensers and the two engine waste heat exchange units are different. Other structures are the same as the embodiment.
Fig. 8 is a schematic diagram of a connection flow of a condenser and an engine waste heat exchange unit in a fifth embodiment of the present invention.
As shown in fig. 8, the gas heat pump subsystem in the present embodiment includes: the first condenser 4a, the second condenser 4b, the first engine waste heat exchange unit 3a and the second engine waste heat exchange unit 3b. Two condensers and two engine waste heat exchange units are connected in parallel one by one, namely, the temperature is T 1 The water in (a) is divided into four paths, the first path flows through the first condenser 4a for heating, the second path flows through the second condenser 4b for heating, the third path flows through the first engine waste heat exchange unit 3a for heating, the fourth path flows through the second engine waste heat exchange unit 3b for heating, and the output temperature after the four paths are converged is T 2 Is a water source.
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 more than two gas heat pump units, and a connection manner between a plurality of condensation pipes and a 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 examples
According to the gas heat pump heat supply system related to the first embodiment, because the gas heat pump heat supply system comprises the gas heat pump subsystem and the boiler subsystem, the two subsystems are arranged in parallel, and the gas heat pump subsystem and the boiler subsystem operate singly or jointly, when the heat supply capacity of the gas heat pump unit is insufficient, the hot water boiler is started and auxiliary heat supply is performed, the heat supply capacity of the whole system is improved, and the system has higher heat efficiency and higher water outlet temperature than a device for preparing hot water by utilizing the boiler and the absorption heat pump together.
Further, the gas heat pump subsystem comprises a gas heat pump unit, the refrigerant in the 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 is discharged in the condenser, the engine waste heat exchange unit absorbs waste heat of the gas engine to release heat, and backwater entering the gas heat pump subsystem can absorb heat of the condenser and the engine waste heat exchange unit to output water supply, so that the fuel consumption is reduced by 50-62% compared with that of a single operation hot water boiler. The heating efficiency is remarkably improved.
Further, since the engine waste heat exchanging unit includes: after high-temperature flue gas after combustion in the gas engine passes through a flue, the high-temperature flue gas firstly 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 liner water firstly flows through the flue gas heat exchanger in the cylinder liner water pipeline to heat, then flows through the cylinder liner of the gas engine to heat continuously, and flows through the engine waste heat exchanger after being boosted by the cylinder liner water pump to transfer heat to backwater, so that the engine waste heat exchange unit can fully utilize waste heat of the gas engine to provide heat.
Further, because the heat accumulator is connected to the water supply pipeline after the gas heat pump unit and the hot water boiler are connected in parallel, the heat accumulator is started to store heat and circulate in the low-peak period of heat consumption, and the heat accumulator participates in heat supply when the heat supply peak demand 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. In addition, 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 are possible in light of the teachings of the invention, which variations and modifications are within the scope of the 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 heating network, carry out the output water supply after rising the temperature to the return water, its characterized in that includes:
the gas heat pump subsystem and the boiler subsystem are arranged in parallel, the water return 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, then the two branches of water are converged and then are output as the water supply,
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, the refrigerant in the evaporator absorbs heat from the air or the 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,
the water of the first branch flows through the condenser and the engine waste heat exchange unit to absorb heat for heating after heat exchange,
the engine waste heat exchange unit includes: a flue gas heat exchanger, a cylinder sleeve water pipeline, an intercooler, a cylinder sleeve water pump and an engine waste heat exchanger,
the cylinder sleeve water pipeline is sequentially connected with the smoke heat exchanger, the cylinder sleeve of the gas engine, the engine waste heat exchanger, the intercooler and the smoke heat exchanger, thereby forming a closed loop,
and cylinder liner water firstly flows through the smoke heat exchanger to heat in the cylinder liner water pipeline, then flows through the cylinder liner of the gas engine to heat continuously, and flows through the engine waste heat exchanger after being boosted by the cylinder liner water pump to exchange heat to water of the first branch, and then flows through the intercooler to heat and then flows to the smoke heat exchanger to complete a cycle.
2. A gas heat pump heating system according to claim 1, characterized in that:
wherein T is 3 At ambient temperature, T 4 、T 5 Respectively are the limit values of the ambient temperature, T 4 The value range is-30 ℃ to-5 ℃, T 5 The value range is-10 ℃ to-35 ℃,
when T is 3 ＜T 5 When the gas heat pump subsystem is not in operation, the boiler subsystem bears the heat supply load,
when T is 5 ≤T 3 ≤T 4 When the gas heat pump subsystem runs at full load and bears the main heat supply load, the boiler subsystem bears part of the heat supply load,
when T is 3 ＞T 4 And when the gas heat pump subsystem runs at full load, the hot water boiler does not run.
3. A gas heat pump heating system according to claim 1, characterized in that:
wherein the source water is one of seawater, sewage and wastewater.
4. A gas heat pump heating system according to claim 1, characterized in that:
wherein, engine waste heat exchange unit still includes: the steam generator is arranged to generate a steam,
the flue of the gas engine is sequentially communicated with the steam generator and the flue gas heat exchanger, and after the high-temperature flue gas generated by mixed combustion of gas and air in the gas engine passes through the flue, the high-temperature flue gas firstly flows through the steam generator so as to heat water in the steam generator to generate steam, and then flows through the flue gas heat exchanger.
5. A gas heat pump heating system according to claim 1, characterized in that:
the intercooler is connected to the cylinder sleeve of the gas engine, and the residual heat of the gas engine is utilized to heat the cylinder sleeve water.
6. A gas heat pump heating system according to claim 1, characterized in that:
wherein the compressor is single-stage compression or multi-stage compression.
7. A gas heat pump heating system according to claim 1, characterized in that:
wherein the condenser and the waste heat exchanger are connected in series or in parallel.
8. A gas heat pump heating system as recited in 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. A gas heat pump heating system in accordance with claim 8, further comprising:
and the solar heat collector is connected with the heat accumulator.
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| CN114576693A (en) | 2022-06-03 |
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