CN111878874A - Flue gas waste heat recovery heating system utilizing air source heat pump peak shaving - Google Patents
Flue gas waste heat recovery heating system utilizing air source heat pump peak shaving Download PDFInfo
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- CN111878874A CN111878874A CN202010840237.6A CN202010840237A CN111878874A CN 111878874 A CN111878874 A CN 111878874A CN 202010840237 A CN202010840237 A CN 202010840237A CN 111878874 A CN111878874 A CN 111878874A
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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
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of heat supply, in particular to a flue gas waste heat recovery heating system utilizing peak shaving of an air source heat pump. The heating system comprises a heat pump unit, a boiler, a flue gas heat recovery device and a water path component, wherein the boiler is connected with the flue gas heat recovery device, and the water path component is connected with the boiler and the heat pump unit; the heat pump unit comprises a first evaporator, a second evaporator, a compressor, a condenser and a throttle valve, wherein the compressor, the condenser and the throttle valve are sequentially connected in series; the first evaporator is connected with the flue gas heat recovery device and is used for exchanging heat with the flue gas recovered by the flue gas heat recovery device; the second evaporator is used for exchanging heat with air. The flue gas waste heat recovery heating system utilizing the peak shaving of the air source heat pump can effectively avoid the waste of energy.
Description
Technical Field
The invention relates to the technical field of heating, in particular to a flue gas waste heat recovery heating system utilizing peak shaving of an air source heat pump.
Background
The heating is to supply heat to the building and keep a certain indoor temperature, and is social service for solving the basic life requirement of the heating of residents in northern China in winter. At present, boilers are main equipment for heating residents in winter, and can be classified into coal-fired boilers and gas-fired boilers according to fuel used by the boilers, wherein the gas-fired boilers have become one of the main forms of heating heat sources in partial regions. In the initial and final cold periods, because the outdoor temperature is higher than that in the severe cold period, the load required by heating of residents is far less than the designed rated load of the boiler, and the operating efficiency of the boiler is low, so that energy waste is caused; in addition, the emission of a large amount of waste heat in the flue gas during the operation of the boiler also causes the waste of energy.
Disclosure of Invention
Therefore, the invention provides a flue gas waste heat recovery heating system utilizing peak shaving of an air source heat pump, which is used for solving the problems of low operation efficiency and energy waste of a boiler in the prior art.
The invention provides a flue gas waste heat recovery heating system utilizing peak shaving of an air source heat pump, which comprises a heat pump unit, a boiler, a flue gas heat recovery device and a water path component, wherein the boiler is connected with the flue gas heat recovery device, and the water path component is connected with the boiler and the heat pump unit;
the heat pump unit comprises a first evaporator, a second evaporator, a compressor, a condenser and a throttle valve, wherein the compressor, the condenser and the throttle valve are sequentially connected in series, the first evaporator and the second evaporator are connected in parallel, and the first evaporator and the second evaporator are both connected in series between the compressor and the throttle valve;
the first evaporator is connected with the flue gas heat recovery device and is used for exchanging heat with the flue gas recovered by the flue gas heat recovery device;
the second evaporator is used for exchanging heat with air.
Optionally, the heating system further comprises a first three-way valve and a second three-way valve;
the first evaporator, the second evaporator and the compressor are communicated through the first three-way valve;
the first evaporator, the second evaporator and the throttle valve are communicated through the second three-way valve.
Optionally, the flue gas heat recovery device comprises a heat and mass exchange tower, a spraying assembly, a collector and a circulating assembly;
the spraying assembly is positioned at the upper end of the heat and mass exchange tower, the collector is positioned at the lower end of the heat and mass exchange tower, and the circulating assembly is connected with the spraying assembly and the collector and is used for conveying the intermediate circulating water in the collector into the spraying assembly;
the circulating assembly is also connected with the first evaporator and is used for enabling the intermediate circulating water to exchange heat with the first evaporator;
the heat and mass exchange tower comprises a flue gas inlet communicated with the boiler, and the flue gas inlet is positioned between the spray assembly and the collector.
Optionally, the circulation assembly comprises a first circulation pipe, a second circulation pipe, and a circulation pump;
one end of the first circulating pipe is connected with the collector, and the other end of the first circulating pipe is connected with the first evaporator;
one end of the second circulating pipe is connected with the first evaporator, and the other end of the second circulating pipe is connected with the spraying assembly;
the circulation pump is connected to the first circulation pipe or the second circulation pipe.
Optionally, the flue gas heat recovery device further comprises a filler layer, the filler layer is arranged in the heat and mass exchange tower, and the filler layer is located between the spray assembly and the flue gas inlet.
Optionally, the flue gas heat recovery device further comprises a dosing device and a demister, the dosing device is connected with the collector, and the dosing device is used for adding a medicament for neutralizing the pH value of the intermediate circulating water into the collector;
the demister is connected with the heat and mass exchange tower, the heat and mass exchange tower comprises a flue gas outlet, and the demister is located between the flue gas outlet and the spray assembly.
Optionally, the second evaporator is an air-cooled heat exchanger.
Optionally, the waterway assembly includes a first water supply pipe, a first water return pipe, a second water supply pipe, a second water return pipe, a heat supply network water supply pipe and a heat supply network water return pipe;
one end of the first water supply pipe is communicated with the heat supply network water supply pipe, the other end of the first water supply pipe is connected with the condenser, one end of the first water return pipe is connected with the condenser, and the other end of the first water return pipe is connected with the heat supply network water return pipe;
one end of the second water supply pipe is communicated with the heat supply network water supply pipe, the other end of the second water supply pipe is connected with the boiler, one end of the second water return pipe is connected with the boiler, and the other end of the second water return pipe is connected with the heat supply network water return pipe.
Optionally, the waterway assembly further includes a four-way valve, and the first return pipe and the second supply pipe are cross-connected by the four-way valve.
Optionally, the waterway assembly further includes a check valve, and the check valve is disposed in each of the pipes of the first water supply pipe and the second water return pipe.
The invention relates to a flue gas waste heat recovery heating system utilizing peak shaving of an air source heat pump, wherein a heat pump unit comprises a first evaporator and a second evaporator, and the first evaporator is connected with a flue gas heat recovery device and is used for exchanging heat with flue gas recovered by the flue gas heat recovery device; the second evaporator is used for exchanging heat with air. In the initial and final cold periods, the second evaporator is used for exchanging heat with air, and the heat pump unit can provide heat for fluid in the water channel assembly by using the temperature of the air, so that energy waste caused by low-load operation of a boiler is avoided; when the temperature that utilizes the air can not satisfy the heat supply demand, use the boiler to provide the heat to the fluid in the water route subassembly, and when using the boiler heat supply, use first evaporimeter with the flue gas heat exchange that the flue gas heat reclamation device was retrieved to heat in the flue gas that utilizes the boiler to discharge, thereby effectively avoid the waste of the energy.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a flue gas waste heat recovery heating system utilizing peak shaving of an air source heat pump according to the present invention;
description of reference numerals:
1-a boiler;
21-a first evaporator; 22-a second evaporator; 23-a compressor; 24-a condenser; 25-a throttle valve; 26-a first three-way valve; 27-a second three-way valve;
31-a heat and mass exchange column; 311-flue gas inlet; 312-a flue gas outlet; 32-a spray assembly; 33-a collector; 341-first circulation pipe; 342-a second circulation pipe; 343-a circulation pump; 35-a filler layer; 36-a dosing device; 37-a demister;
41-a first water supply pipe; 42-a first water return pipe; 43-a second water supply pipe; 44-a second water return pipe; 45-heat net water supply pipe; 46-heat supply network return pipe; 47-four-way valve; 48-check valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, an embodiment of the present invention provides a flue gas waste heat recovery heating system using peak shaving of an air source heat pump, including a heat pump unit, a boiler 1, a flue gas heat recovery device, and a water path component, where the boiler 1 is connected to the flue gas heat recovery device, and the water path component is connected to the boiler 1 and the heat pump unit.
The heat pump unit comprises a first evaporator 21, a second evaporator 22, a compressor 23, a condenser 24 and a throttle valve 25, wherein the compressor 23, the condenser 24 and the throttle valve 25 are sequentially connected in series, the first evaporator 21 and the second evaporator 22 are connected in parallel, and the first evaporator 21 and the second evaporator 22 are both connected in series between the compressor 23 and the throttle valve 25; the first evaporator 21 is connected with the flue gas heat recovery device and is used for exchanging heat with the flue gas recovered by the flue gas heat recovery device; the second evaporator 22 is used for heat exchange with air.
Specifically, the heat pump unit is a high-efficiency energy-saving device which fully utilizes low-grade heat energy, and can effectively utilize the low-grade heat energy which is difficult to apply to achieve the purpose of energy conservation. The heat pump unit is internally provided with a circulating working medium, and the waterway assembly is internally provided with water.
The first evaporator 21 is a place where the flue gas heat recovered by the flue gas heat recovery device exchanges heat with a circulating working medium in the heat pump unit. The flue gas is transferred to the circulating working medium, and the low-temperature low-pressure liquid circulating working medium is converted into a low-temperature low-pressure gaseous circulating working medium.
The second evaporator 22 absorbs heat from the environment for the circulating working medium, and converts the low-temperature low-pressure liquid circulating working medium into a low-temperature low-pressure gaseous circulating working medium.
The compressor 23 is a device for compressing the circulating working medium. The compressor 23 compresses the low-temperature low-pressure gaseous circulating working medium into a high-temperature high-pressure gaseous state.
The condenser 24 is a device for exchanging heat between the circulating working medium and water in the waterway assembly. The circulating working medium in the condenser 24 is changed from a high-temperature high-pressure gas state to a high-temperature high-pressure liquid state and releases heat, and the released heat is transferred to water.
The throttle 25 is a device that uses local contraction to create a static pressure differential. After passing through the throttle valve 25, the pressure of the circulating working medium changes, and the circulating working medium is changed from a high-temperature high-pressure liquid state to a low-temperature low-pressure liquid state, so that the circulating working medium enters the first evaporator 21 and/or the second evaporator 22 to form a complete cycle.
The boiler 1 is an energy conversion device, and is suitable for heating, and usually uses natural gas or coal as fuel, and the fuel is combusted to generate a large amount of heat and flue gas, and the flue gas also has high heat. Boiler 1 is connected with the flue gas heat reclamation device, and the flue gas heat reclamation device is arranged in retrieving the heat in the flue gas to avoid the waste of the energy.
According to the flue gas waste heat recovery heating system utilizing the peak shaving of the air source heat pump, the second evaporator 22 is used for heat exchange with air in the initial and final cold periods, the heat pump unit can utilize the temperature of the air to provide heat for fluid in the water channel assembly, and energy waste caused by low-load operation of the boiler 1 is avoided; when the temperature that utilizes the air can not satisfy the heat supply demand, use boiler 1 to provide the heat to the fluid in the water route subassembly, and when using boiler 1 heat supply, use the flue gas heat exchange of first evaporimeter 21 and flue gas heat reclamation device recovery to heat in the flue gas that utilizes boiler 1 to discharge, thereby effectively avoid the waste of the energy.
As shown in fig. 1, in an embodiment, the flue gas waste heat recovery heating system using air source heat pump peak shaving further includes a first three-way valve 26 and a second three-way valve 27; the first evaporator 21, the second evaporator 22, and the compressor 23 are communicated by a first three-way valve 26; the first evaporator 21, the second evaporator 22, and the throttle valve 25 are communicated by a second three-way valve 27.
The first three-way valve 26 and the second three-way valve 27 are arranged, so that the first evaporator 21 and the second evaporator 22 can be selected according to the use requirement of the peak shaving flue gas waste heat recovery heating system using the air source heat pump. For example, in the initial and final cold period, the second evaporator 22 is communicated with the compressor 23 and the throttle valve 25, only the second evaporator 22 is used for exchanging heat with air, and the heat pump unit utilizes heat in the air. When the heat supply by utilizing the heat in the air can not meet the heat supply requirement, the boiler 1 is used for supplying heat, the first evaporator 21 is communicated with the compressor 23 and the throttle valve 25, and the first evaporator 21 exchanges heat with the flue gas recovered by the flue gas heat recovery device; or the first evaporator 21 and the second evaporator 22 are both communicated with the compressor 23 and the throttle valve 25, the first evaporator 21 exchanges heat with the flue gas recovered by the flue gas heat recovery device, the second evaporator 22 exchanges heat with air, and the water path component exchanges heat with the boiler 1 and the heat pump unit at the same time.
As shown in fig. 1, in one embodiment, the flue gas heat recovery device includes a heat and mass exchange tower 31, a spray assembly 32, a collector 33, and a circulation assembly.
The spray assembly 32 is positioned at the upper end of the heat and mass exchange tower 31, the collector 33 is positioned at the lower end of the heat and mass exchange tower 31, and the circulating assembly is connected with the spray assembly 32 and the collector 33 and is used for conveying the intermediate circulating water in the collector 33 into the spray assembly 32.
The circulation component is also connected with the first evaporator 21 and is used for enabling the intermediate circulating water to exchange heat with the first evaporator 21;
the heat and mass exchange column 31 comprises a flue gas inlet 311 communicating with the boiler 1, the flue gas inlet 311 being located between the spray assembly 32 and the collector 33.
Flue gas obtained by combustion of the boiler 1 enters the heat medium exchange tower 31 through the flue gas inlet 311, heat exchange is carried out between the flue gas and low-temperature medium circulating water sprayed by the spray assembly 32 in the upward movement process of the flue gas, the heat of the flue gas is absorbed, the temperature is raised to high-temperature medium circulating water, the high-temperature medium circulating water falls into the collector 33, the circulating assembly is connected with the first evaporator 21, the high-temperature medium circulating water in the collector 33 is transported to the spray assembly 32 in the process of the circulating assembly, the high-temperature medium circulating water exchanges heat with a circulating working medium in the first evaporator 21, the medium circulating water flows out of the first heat exchanger after the temperature is reduced to the low-temperature medium circulating water, and enters the spray assembly 32, and the medium. The flue gas heat recovery device can effectively recover heat in the flue gas.
As shown in fig. 1, in one embodiment, the circulation assembly includes a first circulation pipe 341, a second circulation pipe 342, and a circulation pump 343; one end of the first circulation pipe 341 is connected to the collector 33 and the other end is connected to the first evaporator 21; one end of the second circulation pipe 342 is connected to the first evaporator 21, and the other end is connected to the shower module 32; the circulation pump 343 is connected to the second circulation pipe 342.
The circulation pump 343 is used to flow the intermediate circulation water in the first circulation pipe 341, the second circulation pipe 342, and the first evaporator 21.
In another embodiment, the circulation pump 343 is connected to the first circulation pipe 341, and since the first circulation pipe 341 is located upstream of the first circulation pipe 341, the second circulation pipe 342, and the first evaporator 21, the circulation effect of the circulation pump 343 is not as good as that of the second circulation pipe 342.
As shown in fig. 1, in an embodiment, the flue gas heat recovery device further includes a packing layer 35, the packing layer 35 is disposed in the heat and mass exchange tower 31, and the packing layer 35 is located between the spray assembly 32 and the flue gas inlet 311.
The packing layer 35 is arranged in a net structure and used for increasing the contact area and the contact time of the flue gas and the intermediate circulating water, thereby improving the heat exchange efficiency of the flue gas and the intermediate circulating water.
As shown in fig. 1, in an embodiment, the flue gas heat recovery device further includes a dosing device 36 and a demister 37, the dosing device 36 is connected to the collector 33, and the dosing device 36 is used for adding a drug for neutralizing the ph of the intermediate circulating water into the collector 33.
The flue gas obtained by burning the fuel usually contains sulfides, nitrides and the like, the sulfides, the nitrides and the like in the flue gas can be absorbed in the heat exchange process of the intermediate circulating water and the flue gas, the intermediate circulating water falling into the collector 33 is acidic, the dosing device 36 is used for adding the medicament for neutralizing the pH value of the intermediate circulating water into the collector 33, so that the intermediate circulating water in the collector 33 is neutral, and the neutral intermediate circulating water is sprayed out of the spray assembly 32 through the circulating assembly to form circulation. The flue gas heat recovery device can eliminate sulfides, nitrides and the like in the flue gas, so that the flue gas meets the emission requirement, and the flue gas is more environment-friendly.
A demister 37 is connected to the heat and mass exchange tower 31, the heat and mass exchange tower 31 comprises a flue gas outlet 312, and the demister 37 is located between the flue gas outlet 312 and the spray assembly 32.
The demister 37 is used for removing moisture in the flue gas, so that the flue gas reaches the emission standard.
In one embodiment, the second evaporator 22 is an air-cooled heat exchanger. An air-cooled heat exchanger is a device that transfers part of the heat of air to a cold fluid.
In one embodiment, the waterway assembly includes a first water supply pipe 41, a first return pipe 42, a second water supply pipe 43, a second return pipe 44, a heat net water supply pipe 45, and a heat net water return pipe 46;
one end of the first water supply pipe 41 is communicated with the heat supply network water supply pipe 45, the other end is connected with the condenser 24, one end of the first water return pipe 42 is connected with the condenser 24, and the other end is connected with the heat supply network water return pipe 46;
one end of the second water supply pipe 43 is communicated with the heat supply network water supply pipe 45, the other end is connected with the boiler 1, one end of the second water return pipe 44 is connected with the boiler 1, and the other end is communicated with the heat supply network water return pipe 46.
The water in the water passage unit flows into the first water supply pipe 41, the condenser 24, and the first return pipe 42 through the heat supply network water supply pipe 45, and then flows out from the heat supply network return pipe 46, and the water is heated by the heat pump unit.
The water in the water path unit flows into the second water supply pipe 43, the boiler 1, and the second water return pipe 44 through the heat supply network water supply pipe 45, and flows out of the heat supply network water return pipe 46, and the water is heated by the boiler 1.
As shown in fig. 1, in an embodiment, the waterway assembly further includes a four-way valve 47, and the first return pipe 42 and the second supply pipe 43 are cross-connected by the four-way valve 47.
When the temperature of the water heated by the condenser 24 cannot be directly used for heating, the hot water in the first water return pipe 42 flows into the second water supply pipe 43, and the water is heated in the boiler 1 to reach the temperature required for heating.
As shown in fig. 1, in an embodiment, the waterway assembly further includes a check valve 48, and the check valves 48 are disposed in the pipes of the first water supply pipe 41 and the second water return pipe 44. The check valve 48 allows the water to flow in a set direction but not in the reverse direction, thereby achieving an effective heat exchange.
In one embodiment, the boiler 1 is a small boiler 1 using gas as fuel. Gas and air enter the boiler 1 from the inlet of the boiler 1 to be combusted, the generated flue gas enters the heat and mass exchange tower 31 through the flue gas outlet, the flue gas is subjected to full heat recovery and purification in the heat and mass exchange tower 31 and then demisted through the demister 37, and finally the flue gas is introduced into the flue gas outlet 312 to be discharged.
As shown in fig. 1, the working flow of the heat exchange system is as follows, and the boiler is described as a gas boiler:
at the time of low load demand in the initial and final cold periods: the liquid circulating working medium exchanges heat with air through the second evaporator 22 to absorb heat in the air for vaporization, and the gaseous circulating working medium is compressed by the compressor 23, enters the condenser 24 for condensation to release heat, and then returns to the second evaporator 22 for circulation. Meanwhile, the water in the waterway assembly enters the condenser 24 through the first water supply pipe 41 to absorb the heat released by the circulating working medium, the temperature is increased, and the heat is supplied to the user through the first water return pipe 42 and the heat supply network water return pipe 46.
When the load is required:
flue gas flow: the flue gas generated after combustion of the gas boiler 1 is introduced from the flue gas inlet 311 of the heat exchange tower 31, the flue gas is in direct countercurrent contact with the intermediate circulating water sprayed by the spraying component 32 in the packing layer 35, the flue gas is cooled and humidified in the ascending process to reach a saturated state, and the flue gas after cooling and humidification continuously flows upwards to pass through the demister 37 to remove water mist in the flue gas and then is discharged into the atmosphere through the flue gas outlet 312.
Circulating intermediate circulating water: the condensation medium circulating water in the collector 33 exchanges heat with the circulating working medium through the first evaporator 21 under the action of the circulating pump 343, the temperature is reduced, the condensation medium circulating water is sprayed out of the spraying assembly 32 and is fully contacted with the flue gas in the packing layer 35 for heat exchange, and then the medium circulating water falls into the collector 33 and is added with chemicals by the chemical adding device 36 for neutralization, so that the circulation is completed.
Circulating a working medium: after the circulating working medium is throttled by the throttle valve 25, one part of the circulating working medium enters the second evaporator 22 to evaporate and absorb heat in air, the other part of the circulating working medium enters the first evaporator 21 to exchange heat with the neutralized intermediate circulating water, the circulating working medium is mixed after heat exchange and enters the compressor 23 to be compressed, and then the circulating working medium enters the condenser 24 to be condensed and release heat, so that circulation is completed.
A hot water flow: the water flows into the first water supply pipe 41, the condenser 24, and the first return pipe 42 through the heat supply network water supply pipe 45, and flows out from the heat supply network return pipe 46, and the water is heated by the condenser 24. The water flows into the second water supply pipe 43, the boiler 1, and the second water return pipe 44 through the heat supply network water supply pipe 45, and flows out of the heat supply network water return pipe 46, and the water is heated by the boiler 1.
When heating is carried out under high load, the gas boiler 1 is used for heating, and meanwhile, the heat of the flue gas is recovered and purified. Adopt air source heat pump set to heat when first cold period heat supply load is lower, reduce boiler 1 operating efficiency when avoiding the load lower. The flue gas waste heat recovery heating system using the air source heat pump for peak shaving has the advantages of low pollutant discharge of the gas boiler 1 and high heat supply efficiency of the boiler 1.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The flue gas waste heat recovery heating system utilizing the peak shaving of the air source heat pump is characterized by comprising a heat pump unit, a boiler (1), a flue gas heat recovery device and a water path component, wherein the boiler (1) is connected with the flue gas heat recovery device, and the water path component is connected with the boiler (1) and the heat pump unit;
the heat pump unit comprises a first evaporator (21), a second evaporator (22), a compressor (23), a condenser (24) and a throttle valve (25), wherein the compressor (23), the condenser (24) and the throttle valve (25) are sequentially connected in series, the first evaporator (21) and the second evaporator (22) are connected in parallel, and the first evaporator (21) and the second evaporator (22) are both connected in series between the compressor (23) and the throttle valve (25);
the first evaporator (21) is connected with the flue gas heat recovery device and is used for exchanging heat with the flue gas recovered by the flue gas heat recovery device;
the second evaporator (22) is used for exchanging heat with air.
2. The peak-shaving flue gas waste heat recovery heating system using an air source heat pump according to claim 1, further comprising a first three-way valve (26) and a second three-way valve (27);
the first evaporator (21), the second evaporator (22) and the compressor (23) are communicated through the first three-way valve (26);
the first evaporator (21), the second evaporator (22) and the throttle valve (25) are communicated through the second three-way valve (27).
3. The system for heating by using the smoke waste heat recovery of the air source heat pump peak shaving according to claim 1, wherein the smoke waste heat recovery device comprises a heat and mass exchange tower (31), a spraying assembly (32), a collector (33) and a circulating assembly;
the spray assembly (32) is positioned at the upper end of the heat and mass exchange tower (31), the collector (33) is positioned at the lower end of the heat and mass exchange tower (31), and the circulating assembly is connected with the spray assembly (32) and the collector (33) and is used for conveying medium circulating water in the collector (33) into the spray assembly (32);
the circulation component is also connected with the first evaporator (21) and is used for enabling the intermediate circulating water to exchange heat with the first evaporator (21);
the heat and mass exchange column (31) comprises a flue gas inlet (311) communicating with the boiler (1), the flue gas inlet (311) being located between the spray assembly (32) and the collector (33).
4. The system of claim 3, wherein the circulation module comprises a first circulation pipe (341), a second circulation pipe (342), and a circulation pump (343);
one end of the first circulation pipe (341) is connected to the collector (33), and the other end is connected to the first evaporator (21);
one end of the second circulating pipe (342) is connected with the first evaporator (21), and the other end is connected with the spraying component (32);
the circulation pump (343) is connected to the first circulation pipe (341) or the second circulation pipe (342).
5. The system according to claim 3, wherein the flue gas heat recovery device further comprises a filler layer (35), the filler layer (35) is disposed in the heat and mass exchange tower (31), and the filler layer (35) is located between the spray assembly (32) and the flue gas inlet (311).
6. The peak-shaving flue gas waste heat recovery heating system according to claim 3, further comprising a chemical adding device (36) and a demister (37), wherein the chemical adding device (36) is connected with the collector (33), and the chemical adding device (36) is used for adding a chemical neutralizing the pH value of the intermediate circulating water into the collector (33);
the demister (37) is connected with the heat and mass exchange tower (31), the heat and mass exchange tower (31) comprises a flue gas outlet (312), and the demister (37) is positioned between the flue gas outlet (312) and the spraying assembly (32).
7. The peak-load smoke waste heat recovery heating system according to any one of claims 1 to 6, wherein said second evaporator (22) is an air-cooled heat exchanger.
8. The system as claimed in claim 1, wherein the water path assembly comprises a first water supply pipe (41), a first water return pipe (42), a second water supply pipe (43), a second water return pipe (44), a heat supply network water supply pipe (45) and a heat supply network water return pipe (46);
one end of the first water supply pipe (41) is communicated with the heat supply network water supply pipe (45), the other end of the first water supply pipe is connected with the condenser (24), one end of the first water return pipe (42) is connected with the condenser (24), and the other end of the first water return pipe is connected with the heat supply network water return pipe (46);
one end of the second water supply pipe (43) is communicated with the heat supply network water supply pipe (45), the other end of the second water supply pipe is connected with the boiler (1), one end of the second water return pipe is connected with the boiler (1), and the other end of the second water return pipe is connected with the heat supply network water return pipe (46).
9. The system as claimed in claim 8, wherein the waterway assembly further comprises a four-way valve (47), and the first water return pipe (42) and the second water supply pipe (43) are cross-connected via the four-way valve (47).
10. The system as claimed in claim 8, wherein the waterway assembly further comprises a check valve (48), and the check valve (48) is disposed in each of the first water supply pipe (41) and the second water return pipe (44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010840237.6A CN111878874A (en) | 2020-08-18 | 2020-08-18 | Flue gas waste heat recovery heating system utilizing air source heat pump peak shaving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010840237.6A CN111878874A (en) | 2020-08-18 | 2020-08-18 | Flue gas waste heat recovery heating system utilizing air source heat pump peak shaving |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110873354A (en) * | 2019-12-23 | 2020-03-10 | 北京市热力集团有限责任公司 | One-machine multi-effect heat pump system for peak regulation heat supply plant and heat pump control method |
| WO2022056990A1 (en) * | 2020-09-18 | 2022-03-24 | 西安热工研究院有限公司 | Combined highly-efficient compression heat pump energy storage and peak regulation system and method for use with thermal power plant |
| CN114576678A (en) * | 2020-11-30 | 2022-06-03 | 上海本家空调***有限公司 | Combined boiler heating system |
-
2020
- 2020-08-18 CN CN202010840237.6A patent/CN111878874A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110873354A (en) * | 2019-12-23 | 2020-03-10 | 北京市热力集团有限责任公司 | One-machine multi-effect heat pump system for peak regulation heat supply plant and heat pump control method |
| WO2022056990A1 (en) * | 2020-09-18 | 2022-03-24 | 西安热工研究院有限公司 | Combined highly-efficient compression heat pump energy storage and peak regulation system and method for use with thermal power plant |
| CN114576678A (en) * | 2020-11-30 | 2022-06-03 | 上海本家空调***有限公司 | Combined boiler heating system |
| CN114576678B (en) * | 2020-11-30 | 2024-03-05 | 上海本家空调***有限公司 | Combined boiler heating system |
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