CN112503764A - Heating system based on natural gas - Google Patents

Heating system based on natural gas Download PDF

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Publication number
CN112503764A
CN112503764A CN202011423651.3A CN202011423651A CN112503764A CN 112503764 A CN112503764 A CN 112503764A CN 202011423651 A CN202011423651 A CN 202011423651A CN 112503764 A CN112503764 A CN 112503764A
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China
Prior art keywords
internal combustion
combustion engine
pump unit
heat exchanger
flue gas
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Pending
Application number
CN202011423651.3A
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Chinese (zh)
Inventor
孟伟
范峻铭
王文想
杨光
刘建辉
刘有民
姜红星
乔亮
关旭
李璐伶
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Shenzhen Deep Combustion Gas Technology Research Institute
Shenzhen Gas Corp Ltd
Original Assignee
Shenzhen Deep Combustion Gas Technology Research Institute
Shenzhen Gas Corp Ltd
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Application filed by Shenzhen Deep Combustion Gas Technology Research Institute, Shenzhen Gas Corp Ltd filed Critical Shenzhen Deep Combustion Gas Technology Research Institute
Priority to CN202011423651.3A priority Critical patent/CN112503764A/en
Publication of CN112503764A publication Critical patent/CN112503764A/en
Priority to PCT/CN2021/122749 priority patent/WO2022121486A1/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • 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
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12—Hot water central heating systems using heat pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

本发明公开了一种基于天然气的制热系统，所述制热系统包括内燃机、发电机、余热回收器及空气源热泵机组，内燃机分别与余热回收器及发电机相连接；内燃机产生的烟气及缸套水传输至余热回收器；发电机与所述空气源热泵机组相连接，通过空气源热泵机组提供生活热水。本发明提供的制热系统采用天热气作为资源来制备电能为空气源热泵机组提供能量，通过空气源热泵机组提供生活热水，并且在空气源热泵机组内通过空气换热器吸收空气中的热量，从而减少空气源热泵机组所处能量，降低生活用水的生产成本。同时，通过余热回收器回收天热气燃烧所形成的的余热，从而提高了天然气的利用率。

Figure 202011423651

The invention discloses a heating system based on natural gas. The heating system comprises an internal combustion engine, a generator, a waste heat recovery device and an air source heat pump unit. The internal combustion engine is respectively connected with the waste heat recovery device and the generator; and the cylinder jacket water is transmitted to the waste heat recovery device; the generator is connected with the air source heat pump unit, and the domestic hot water is provided through the air source heat pump unit. The heating system provided by the invention uses natural hot air as a resource to prepare electric energy to provide energy for the air source heat pump unit, provide domestic hot water through the air source heat pump unit, and absorb the heat in the air through the air heat exchanger in the air source heat pump unit. , thereby reducing the energy of the air source heat pump unit and reducing the production cost of domestic water. At the same time, the waste heat formed by the combustion of natural hot gas is recovered through the waste heat recovery device, thereby improving the utilization rate of natural gas.

Figure 202011423651

Description

Heating system based on natural gas
Technical Field
The invention relates to the technical field of natural gas, in particular to a heating system based on natural gas.
Background
With the increasing prominence of global warming, energy crisis and environmental pollution problems, energy-saving and environment-friendly technologies are urgently needed. Accelerating the efficient utilization of the developed clean energy at the end of a user is an important path for promoting the coordinated and stable development and constructing a clean, low-carbon, safe and efficient modern energy system.
The conventional boiler heating system generally uses traditional resources such as coal and the like as combustion resources to provide heating energy, or directly adopts an electric heating mode, wherein the boiler heating system adopting the traditional resources such as coal and the like has low heating efficiency and large pollution; the problem of large energy consumption of an electric heating boiler heating system is generally existed.
Disclosure of Invention
The invention aims to provide a heating system based on natural gas, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a heating system based on natural gas comprises an internal combustion engine, a generator, a waste heat recoverer and an air source heat pump unit, wherein the internal combustion engine is respectively connected with the waste heat recoverer and the generator; the flue gas generated by the internal combustion engine and the cylinder sleeve water are transmitted to the waste heat recoverer; the internal combustion engine provides energy for the generator to obtain electric energy generated by the generator; the generator is connected with the air source heat pump unit and provides domestic hot water through the air source heat pump unit.
The natural gas-based heating system comprises an air source heat pump unit, a heat exchanger, a heat pump unit and a heat exchanger, wherein the air source heat pump unit comprises a compressor, a hot water heat exchanger and an air heat exchanger; the compressor is connected with the generator, and the compressor, the hot water heat exchanger and the air heat exchanger are sequentially connected to form a heat exchange loop.
Heating system based on natural gas, wherein, air source heat pump unit still includes the choke valve, the choke valve is located hot water heat exchanger with between the air heat exchanger.
The heating system based on the natural gas is characterized in that the hot water heat exchanger is connected with the domestic water end, return water on the recovery side of the domestic water end flows into the hot water heat exchanger, and flows into the water outlet side of the domestic user end after being heated by the hot water heat exchanger.
The heating system based on the natural gas is characterized in that a first branch and a second branch are arranged between the internal combustion engine and the waste heat recoverer, high-temperature flue gas formed by the internal combustion engine flows into the waste heat recoverer through the first branch, and cylinder liner water of the internal combustion engine circulates between the internal combustion engine and the waste heat recoverer through the second branch.
The heating system based on natural gas is characterized in that a flue gas regulating valve is arranged on the first branch, so that the amount of flue gas flowing into the waste heat recoverer is regulated through the flue gas regulating valve.
The heating system based on the natural gas is characterized in that the flue gas regulating valve is connected with a third branch, and the internal combustion engine is connected with the third branch through the flue gas regulating valve so as to control the amount of flue gas flowing into the third branch through the flue gas regulating valve.
Has the advantages that: compared with the prior art, the invention provides a heating system which comprises an internal combustion engine, a generator, a waste heat recoverer and an air source heat pump unit, wherein the internal combustion engine is respectively connected with the waste heat recoverer and the generator; the flue gas generated by the internal combustion engine and the cylinder sleeve water are transmitted to the waste heat recoverer; the internal combustion engine provides energy for the generator to obtain electric energy generated by the generator; the generator is connected with the air source heat pump unit and provides domestic hot water through the air source heat pump unit. The heating system provided by the invention adopts the natural heat as a resource to prepare electric energy to provide energy for the air source heat pump unit, provides domestic hot water through the air source heat pump unit, and absorbs heat in the air through the air heat exchanger in the air source heat pump unit, so that the energy of the air source heat pump unit can be reduced, and the production cost of the domestic water can be reduced. Meanwhile, the waste heat formed by burning the natural gas is recovered through the waste heat recoverer, so that the utilization rate of the natural gas is improved.
Drawings
Fig. 1 is a schematic structural diagram of a natural gas-based heating system according to the present invention.
Detailed Description
The present invention provides a heating system based on natural gas, and in order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention will be further explained by the description of the embodiments with reference to the drawings.
The embodiment provides a heating system based on natural gas, as shown in fig. 1, the heating system includes an internal combustion engine 100, a generator 300, a waste heat recoverer 200 and an air source heat pump unit; the internal combustion engine 100 is connected with the generator 300, the internal combustion engine 100 is connected with the waste heat recoverer 200, and the generator 300 is connected with the air source heat pump unit. The internal combustion engine 100 provides energy for the generator 300 by burning natural gas, and forms high-temperature flue gas and high-temperature cylinder liner water; the high-temperature cylinder liner water is transmitted to a waste heat recoverer 200, and is cooled by the waste heat recoverer 200 and then returns to the internal combustion engine 100, so that the cylinder liner water is recycled; high-temperature flue gas generated by the internal combustion engine 100 is transmitted to the waste heat recoverer 200, the waste heat recoverer 200 absorbs heat in the high-temperature flue gas and then removes the high-temperature flue gas, the waste heat recoverer 200 absorbs heat carried by high-temperature cylinder sleeve water and the high-temperature flue gas, and water medium flowing into the waste heat recoverer is converted into high-temperature steam through the absorbed heat so as to provide the high-temperature steam for industry. The generator 300 provides electric energy for the air source heat pump unit, and the air source heat pump unit provides domestic hot water based on the electric energy; therefore, part of energy generated by the hot combustion of the natural gas is converted into electric energy to be used for preparing domestic hot water by the air source heat pump unit, and the other part of the energy forms heat energy through high-temperature flue gas and high-temperature cylinder sleeve water and is absorbed by the waste heat recoverer 200 to be used for preparing industrial high-temperature water vapor, so that the synchronous supply of the high-temperature water vapor and the domestic hot water for the industry is realized, and meanwhile, the utilization rate of the natural gas is also improved.
In one implementation of this embodiment, the internal combustion engine 100 may use methane, syngas, biogas, coal gas, and the like, in addition to natural gas. The natural gas provided in this embodiment is only an example, and other gases that can be used as the gas source of the internal combustion engine 100 can be used as the natural gas in this embodiment. Of course, in practical applications, the internal combustion engine 100 may be determined according to the air supply of the internal combustion engine 100, or the air supply may be determined according to the air supply suitable for the internal combustion engine 100, and so on.
In one implementation manner of this embodiment, the heating system may include a circuit board, the generator 300 is connected to the circuit board, the circuit board is connected to the air source heat pump unit and the user side, and the electric energy is transmitted to the air source heat pump unit and the user side through the circuit board. The circuit integrated board provides electric energy for the air source heat pump unit according to the power consumption requirement of the air source heat pump unit, and when the electric energy generated by the generator 300 is larger than the electric energy required by the air source heat pump unit, the surplus electric energy can be supplied to a user side, so that the waste of the surplus electric energy is avoided, and the utilization rate of the electric energy can be improved. In an implementation manner of this embodiment, the user side may be a user side power grid bus, and the circuit integration board is connected to the user side power grid bus to transmit the electric energy to the power grid.
In one implementation manner of this embodiment, the air source heat pump unit is connected to an external power source, so that the external power source and the circuit integrated board serve as two energy supply ends of the air source heat pump unit, and the energy supply end adopted by the air source heat pump unit is determined based on the cost of the electric energy provided by the two energy supply ends, wherein the energy supply end adopted by the air source heat pump unit is a low-cost energy supply end of the electric energy provided by the two energy supply ends, so that the energy supply end adopted by the air source heat pump unit is determined based on the cost of the electric energy, the refrigeration cost can be reduced, and the flexibility and the economic competitiveness of the system are increased. In one embodiment, since the cost of the electric power provided by the circuit board is higher than the cost of the electric power provided by the external power source when the electricity price is in the valley period, the external power source can be used as the power supply terminal, and the cost of the electric power provided by the circuit board is lower than the cost of the electric power provided by the external power source when the electricity price is in the peak period, the circuit board can be used as the power supply terminal. Further, in practical applications, when the external power source is used as the power supply terminal, the internal combustion engine 100 may be controlled to stop operating.
In one implementation mode, the air source heat pump unit comprises a compressor 401, a hot water heat exchanger 402 and an air heat exchanger 403, the compressor 401 is connected with a circuit integration board, and the compressor 401, the hot water heat exchanger 402 and the air heat exchanger 403 form a loop. The compressor 401 is connected with an external power supply and a circuit board to provide electric energy for the compressor 401 through the external power supply and the circuit board; the compressor 401 is connected with the hot water heat exchanger 402, the transmission medium compressed by the compressor 401 is transmitted to the hot water heat exchanger 402, heat exchange is carried out between the transmission medium and cooling water flowing into the hot water heat exchanger 402 in the hot water heat exchanger 402, and domestic hot water after heat exchange flows out of the hot water heat exchanger 402; the transmission medium passing through the hot water heat exchanger 402 exchanges heat with the air flowing into the air heat exchanger 403 by being transmitted to the air heat exchanger 403 to absorb heat in the air; the transport medium flowing through the air heat exchanger 403 flows back to the compressor 401 to form a circulation of the transport medium along the compressor 401, the hot water heat exchanger 402 and the air heat exchanger 403 forming a loop.
The air source heat pump unit further comprises a throttle valve 404, the throttle valve 404 is located between the hot water heat exchanger 402 and the air heat exchanger 403, and the transmission medium flowing out of the hot water heat exchanger 402 is depressurized through the throttle valve 404, so that the transmission medium flowing into the air heat exchanger 403 through the throttle valve 404 can exchange heat with the air flowing into the air heat exchanger 403. In addition, the hot water heat exchanger 402 is connected with a domestic water end, return water on the recovery side of the domestic water end flows into the hot water heat exchanger 402, and flows into the water outlet side of a domestic user end after being heated by the hot water heat exchanger 402; the return water exchanges heat with the transmission medium flowing into the hot water heat exchanger 402 through the hot water heat exchanger 402, absorbs heat in the transmission medium to raise the temperature, and the raised temperature flows into the water outlet side of the domestic user side to provide domestic hot water for the domestic water end.
In a specific implementation manner, a low-temperature low-pressure transmission medium flows into the compressor 401, the compressor 401 compresses the low-temperature low-pressure transmission medium to a high-temperature high-pressure transmission medium, and transmits the high-temperature high-pressure transmission medium to the hot water heat exchanger 402, and the high-temperature high-pressure transmission medium exchanges heat with return water flowing into the hot water heat exchanger 402 in the hot water heat exchanger 402, so that the temperature of the return water is raised to 30-40 ℃ to provide domestic hot water for a domestic water end; the high temperature and high pressure transmission medium is converted to a low temperature and high pressure transmission medium by the hot water heat exchanger 402; the low-temperature high-pressure transmission medium is converted into a low-temperature low-pressure transmission medium through a throttle valve 404; the low-temperature and low-pressure transmission medium exchanges heat with air flowing into the air heat exchanger 403 in the air heat exchanger 403, absorbs heat in the air, and then transmits the heat to the compressor 401.
In an implementation manner of this embodiment, a first branch and a second branch are disposed between the internal combustion engine 100 and the waste heat recovery device 200, high-temperature flue gas formed by the internal combustion engine 100 flows into the waste heat recovery device 200 through the first branch, cylinder liner water of the internal combustion engine 100 circulates between the internal combustion engine 100 and the waste heat recovery device 200 through the second branch, the second branch is a circulation branch, a cylinder liner water circulation branch is formed between the internal combustion engine 100 and the waste heat recovery device 200, high-temperature cylinder liner water formed by burning of the internal combustion engine 100 flows into the waste heat recovery device 200 through the second branch, exchanges heat with an aqueous medium flowing into the waste heat recovery device 200 to reduce temperature, and the cylinder liner water with reduced temperature flows back to the internal combustion engine 100 through the second branch to cool the internal combustion. The internal combustion engine 100 forms high-temperature flue gas in the process of burning hot gas, the high-temperature flue gas flows into the waste heat recoverer 200 through the first branch, and exchanges heat with the aqueous medium flowing into the waste heat recoverer 200 to reduce the temperature, and the flue gas with the reduced temperature is discharged through the waste heat recoverer 200. Therefore, the heat in the high-temperature flue gas and the high-temperature cylinder sleeve water can be synchronously recovered through the waste heat recoverer 200, and the energy utilization rate is improved.
In a specific implementation mode, the power generation efficiency of the internal combustion engine 100 is more than 30%, the temperature of generated high-temperature flue gas is between 400 and 550 ℃, and the temperature of generated high-temperature cylinder liner water is between 70 and 85 ℃; the water medium flowing into the waste heat recoverer 200 exchanges heat with high-temperature cylinder liner water generated by the internal combustion engine 100, the high-temperature cylinder liner water is reduced by about 15 ℃, and the reduced cylinder liner water can be sent back to the internal combustion engine 100 group again to be used for cooling the unit; the heated water medium can further exchange heat with high-temperature flue gas generated by the internal combustion engine 100 to generate industrial high-temperature steam.
Based on this, in one implementation manner of this embodiment, the waste heat recoverer 200 may include a first heat exchanger and a second heat exchanger, the first heat exchanger is connected to the second heat exchanger, the first heat exchanger and the jacket cylinder of the internal combustion engine 100 form a heat exchange loop, the first heat exchanger is connected to the flue gas outlet of the internal combustion engine 100, the aqueous medium flowing into the first heat exchanger flows into the second heat exchanger after passing through the first heat exchanger, and the high-temperature water vapor flows out of the second heat exchanger. It can be understood that the aqueous medium exchanges heat with the high-temperature cylinder jacket water flowing into the first heat exchanger to raise the temperature, and the aqueous medium after the temperature rise flows into the second heat exchanger and exchanges heat with the high-temperature flue gas flowing into the second heat exchanger to be converted into high-temperature water vapor.
In one implementation manner of this embodiment, a flue gas adjusting valve 201 is disposed on the first branch, so as to adjust the amount of flue gas flowing into the waste heat recoverer 200 through the flue gas adjusting valve 201. The flue gas regulating valve 201 is connected with a third branch, and the internal combustion engine 100 is connected with the third branch through the flue gas regulating valve 201 so as to control the amount of flue gas flowing into the third branch through the flue gas regulating valve 201. Thus, the high-temperature flue gas discharged by the internal combustion engine 100 is divided into the first branch and the third branch by the flue gas regulating valve 201, and the generated heat can be controlled by controlling the flue gas amount of the first branch and the third branch. For example, when the heat load required by the domestic water end is low, the flue gas amount of the first branch can be adjusted by the opening degree of the flue gas adjusting valve 201 to provide the required heat for the high-temperature water vapor; on the contrary, when the heat load required by the domestic water end is high, the flue gas amount of the first branch can be reduced through the opening degree of the flue gas adjusting valve 201 so as to provide the required heat for the high-temperature steam.
In summary, the present embodiment provides a heating system, which includes an internal combustion engine, a generator, a waste heat recovery device, and an air source heat pump unit, where the internal combustion engine is connected to the waste heat recovery device and the generator respectively; the flue gas generated by the internal combustion engine and the cylinder sleeve water are transmitted to the waste heat recoverer; the internal combustion engine provides energy for the generator to obtain electric energy generated by the generator; the generator is connected with the air source heat pump unit and provides domestic hot water through the air source heat pump unit. The heating system provided by the invention adopts the natural heat as a resource to prepare electric energy to provide energy for the air source heat pump unit, provides domestic hot water through the air source heat pump unit, and absorbs heat in the air through the air heat exchanger in the air source heat pump unit, so that the energy of the air source heat pump unit can be reduced, and the production cost of the domestic water can be reduced. Meanwhile, the waste heat formed by burning the natural gas is recovered through the waste heat recoverer, so that the utilization rate of the natural gas is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. A heating system based on natural gas is characterized by comprising an internal combustion engine, a generator, a waste heat recoverer and an air source heat pump unit, wherein the internal combustion engine is respectively connected with the waste heat recoverer and the generator; the flue gas generated by the internal combustion engine and the cylinder sleeve water are transmitted to the waste heat recoverer; the internal combustion engine provides energy for the generator to obtain electric energy generated by the generator; the generator is connected with the air source heat pump unit and provides domestic hot water through the air source heat pump unit.
2. The natural gas based heating system according to claim 1, wherein the air source heat pump unit comprises a compressor, a hot water heat exchanger, and an air heat exchanger; the compressor is connected with the generator, and the compressor, the hot water heat exchanger and the air heat exchanger are sequentially connected to form a heat exchange loop.
3. The natural gas based heating system of claim 2, wherein the air-source heat pump unit further comprises a throttle valve positioned between the hot water heat exchanger and the air heat exchanger.
4. The natural gas-based heating system according to claim 2, wherein the hot water heat exchanger is connected to a domestic water end, and return water on a recovery side of the domestic water end flows into the hot water heat exchanger, and flows into a water outlet side of a domestic user end after being heated by the hot water heat exchanger.
5. The natural gas-based heating system according to claim 1, wherein a first branch and a second branch are provided between the internal combustion engine and the waste heat recovery device, high-temperature flue gas generated by the internal combustion engine flows into the waste heat recovery device through the first branch, and cylinder jacket water of the internal combustion engine circulates between the internal combustion engine and the waste heat recovery device through the second branch.
6. The natural gas based heating system according to claim 5, wherein a flue gas adjusting valve is provided on the first branch to adjust an amount of flue gas flowing into the waste heat recoverer through the flue gas adjusting valve.
7. The natural gas based heating system according to claim 6, wherein the flue gas regulating valve is connected to the third branch, and the internal combustion engine is connected to the third branch through the flue gas regulating valve, so as to control the amount of flue gas flowing into the third branch through the flue gas regulating valve.
CN202011423651.3A 2020-12-08 2020-12-08 Heating system based on natural gas Pending CN112503764A (en)

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CN202011423651.3A CN112503764A (en) 2020-12-08 2020-12-08 Heating system based on natural gas
PCT/CN2021/122749 WO2022121486A1 (en) 2020-12-08 2021-10-09 Heating system employing natural gas

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