CN109579038B - Natural gas flue gas dehumidification waste heat reutilization system - Google Patents

Natural gas flue gas dehumidification waste heat reutilization system Download PDF

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CN109579038B
CN109579038B CN201811421177.3A CN201811421177A CN109579038B CN 109579038 B CN109579038 B CN 109579038B CN 201811421177 A CN201811421177 A CN 201811421177A CN 109579038 B CN109579038 B CN 109579038B
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flue gas
dehumidification
water
stage evaporator
area
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CN109579038A (en
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王政伟
盛有志
许鑫
陈非凡
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Changzhou University
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Changzhou University
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • 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
    • 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)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geometry (AREA)
  • Drying Of Gases (AREA)

Abstract

The invention provides a natural gas flue gas dehumidification waste heat recycling system which comprises a finned tube heat exchanger, a rotary flue gas dehumidification device and a flue gas source heat pump. The flue gas is subjected to heat exchange and temperature reduction through the finned tube heat exchanger, the cooled wet flue gas is subjected to moisture absorption through the rotary flue gas dehumidification device, the water vapor content is reduced, the flue gas enters a second-stage evaporator of the heat pump again to exchange heat with a refrigerant and is further cooled and then discharged into the atmosphere, and the heated and humidified dehumidifying agent is used for preheating outdoor inlet air and is cooled to realize regeneration circulation; the heated and humidified outdoor inlet air enters the first-stage evaporator of the heat pump to exchange heat with the refrigerant, the heat emitted by the condenser is used for heating cold water, and the heated water enters the finned tube heat exchanger to exchange heat with the flue gas to further raise the temperature, so that the water is used for heating domestic water for users to use. The system can obviously improve the waste heat recovery rate of the natural gas flue gas, cold water is heated in a gradient manner, and the dehumidifying agent dries wet flue gas and converts the wet flue gas into dry flue gas, so that the investment and operation cost are reduced, the possibility of low-temperature corrosion is reduced, and the economic benefit is obvious.

Description

Natural gas flue gas dehumidification waste heat reutilization system
Technical Field
The invention relates to the technical field of flue gas waste heat recovery systems, in particular to a natural gas flue gas dehumidification waste heat recycling system, and belongs to the field of energy and power engineering systems.
Background
Natural gas is used as a high-quality and high-efficiency clean fuel, is widely popularized and applied in the civil and industrial fields, and has great practical significance for environmental protection. Natural gas boilers have become dominant in the heating field because of their high thermal efficiency. The natural gas belongs to fossil energy, has high heat value, is easy to clean and burn, but cannot be regenerated, the cumulative consumption of the natural gas in 2017 is 2373 billion cubic meters, and is increased by 15.3 percent compared with 2016, so that the energy utilization rate of the natural gas is improved, and the operation cost is reduced.
The flue gas of natural gas combustion contains a large amount of water vapor, the volume fraction ratio is up to more than 20%, and simultaneously, because the central temperature in the combustion process is high, NO in the flue gasXIn proportion ofHigh, so the exhaust gas temperature of the natural gas boiler is generally far higher than the dew point temperature of the water vapor to avoid NOxThe acidic solution dissolved in water causes low-temperature corrosion to the heat exchanger, and the flue gas with high exhaust temperature causes a great deal of sensible heat and latent heat loss; and because of the existence of vapor in the wet flue gas, the phenomenon of 'white smoke' can appear when the flue gas is discharged into the atmosphere, which leads to the occurrence of haze and is unfavorable for environmental protection.
In recent years, various forms of flue gas waste heat recovery systems have appeared, and absorption type or compression type flue gas source heat pumps are applied to flue gas latent heat recovery, for example, chinese patent No. CN 104132481 a discloses a flue gas source heat pump hot water system and a low-temperature flue gas waste heat recovery and utilization method, wherein flue gas enters a heat pipe type evaporator of the flue gas source heat pump hot water system, heat is transferred to a refrigerant through a heat pipe, and the refrigerant is sent to a shell-and-tube type condenser by a compressor to heat tap water. The flue gas source heat pump hot water system can directly and efficiently recover low-temperature flue gas waste heat, the waste heat recovery rate is improved, the exhaust gas temperature is greatly reduced, however, the low-temperature corrosion to the heat pipe type evaporator is serious when the water vapor in the flue gas is cooled and condensed, and the equipment investment and the operating cost are high.
Therefore, the water vapor in the natural gas flue gas is removed by a physical adsorption method before being condensed and condensed, so that wet flue gas is converted into dry flue gas, the dry flue gas is used as a flue gas source heat pump heat source and exchanges heat with a refrigerant in an evaporator, the low-temperature corrosion of the flue gas source heat pump can be avoided, the safe operation is greatly improved, and the cost is reduced by adopting common materials.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a natural gas flue gas dehumidification waste heat recycling system.
The technical scheme adopted for solving the technical problems is as follows: a natural gas flue gas dehumidification waste heat recycling system comprises a finned tube heat exchanger communicated with a boiler flue gas outlet, a rotary flue gas dehumidification device and a flue gas source heat pump, wherein the rotary flue gas dehumidification device comprises a dragging motor, a dehumidification regenerator and a fan; an air inlet of the regeneration zone is connected to a fan, and an air outlet of the regeneration zone is connected to a flue gas source heat pump; the driving motor drives the dehumidifying regenerator to axially rotate, so that the rotation of the dehumidifying agent in the dehumidifying area and the regenerating area is realized.
Further, the flue gas source heat pump comprises a first-stage evaporator, a second-stage evaporator, a compressor, a condenser and a throttle valve, wherein an inlet of the first-stage evaporator is connected with an air outlet of a regeneration area through an air pipe, an outlet of the first-stage evaporator is connected to the second-stage evaporator, a flue gas outlet of a dehumidification area is connected to the second-stage evaporator through a flue, the second-stage evaporator is connected to the compressor, the compressor and the condenser are sequentially connected, an outlet of the condenser returns to the first-stage evaporator through a pipeline, and the throttle valve is further arranged on the pipeline between the condenser and the first-stage evaporator.
The first-stage evaporator, the second-stage evaporator, the condenser and the like are parts of the smoke source heat pump, and the refrigerant circulates among the parts of the smoke source heat pump. The inlet of the second-stage evaporator of the flue gas source heat pump is connected with the flue gas outlet of the dehumidification area through a flue, and the inlet of the first-stage evaporator of the flue gas source heat pump is connected with the outlet of the regeneration area through an air pipe. The dried flue gas enters a second-stage evaporator to exchange heat with a refrigerant for cooling, and the temperature is reduced to the ambient temperature and then discharged into the atmosphere; the hot air enters the first-stage evaporator to exchange heat with the refrigerant and reduce the temperature to the ambient temperature, the first-stage evaporator of the flue gas source heat pump and the second-stage evaporator of the flue gas source heat pump can be connected in series and can be connected in parallel, cold water enters from a water inlet of the condenser, heat discharged by the condenser heats the cold water, a water outlet of the condenser and a water inlet of the finned tube heat exchanger are connected with the water pump through a water pipe, and water flowing out of the condenser enters the finned tube heat exchanger to carry.
Furthermore, a flue gas inlet and a flue gas outlet of the finned tube heat exchanger are respectively positioned at the left end and the right end, and the flue gas inlet of the finned tube heat exchanger is connected with a flue gas input device; the water inlet of the finned tube heat exchanger is positioned at the lower end, the water outlet is positioned at the upper two ends, the water inlet of the finned tube heat exchanger is connected with the water outlet of the condenser through a water pipe, and a water pump is arranged on the water pipe; hot water at the water outlet of the finned tube heat exchanger enters a heat user pipe network. The water flows through the tube pass, the flue gas transversely passes through the finned tube bundle to heat the water, and the water and the flue gas exchange heat in a countercurrent mode integrally.
Furthermore, fins are additionally arranged on a tube bundle of the finned tube heat exchanger to enhance the heat exchange effect. Preferably the fins are evenly arranged.
Furthermore, a hygrometer is arranged in the dehumidification area. Preferably, the hygrometer is arranged at the end of the flue gas outlet of the dehumidification region, and the desiccant at the end of the dehumidification region is finally saturated, so that when the end saturation is detected, the utilization rate of the desiccant can be maximized.
Preferably, the desiccant is a dense porous structure.
Preferably, the flue gas source heat pump is a compression type flue gas source heat pump or an absorption type flue gas source heat pump.
The wet flue gas which flows out after being cooled by the finned tube heat exchanger is dried into dry flue gas in a solid desiccant in the rotary flue gas dehumidification device, and the dry flue gas enters a second-stage evaporator of a flue gas source heat pump to exchange heat with a refrigerant and be cooled and then is discharged into the atmosphere; the solid desiccant is transferred to a regeneration area to carry out heat and humidity exchange with outdoor inlet air, the outdoor inlet air is heated and humidified by the solid desiccant to form hot and humid air, the hot and humid air enters the first-stage evaporator of the flue gas source heat pump to exchange heat with a refrigerant, the solid desiccant is desorbed and regenerated, and heat released by the condenser and heat released by flue gas in the finned tube heat exchanger are used for heating cold water steps.
The inlet of the dehumidification area is connected with the outlet flue of the finned tube heat exchanger, and the inlet of the regeneration area is connected with a fan through an air pipe; in the dehumidification process, the flue gas flows out of an outlet on the left side of the finned tube heat exchanger and enters a dehumidification area of the rotary flue gas dehumidification device, a solid desiccant in the dehumidification area is in direct contact with the flue gas to cool and dehumidify the wet flue gas, the partial pressure of the steam on the surface of the solid desiccant is far smaller than the partial pressure of the steam of the wet flue gas, and the steam in the wet flue gas can be transferred into the solid desiccant under the action of the partial pressure difference. The rotary flue gas dehumidifying device is driven by the dragging motor to slowly rotate, and when the solid dehumidifying agent adsorbs water vapor in the dehumidifying area and reaches a saturated state, the solid dehumidifying agent enters the regenerating area for desorption and regeneration, wherein the regeneration process comprises the following steps: outdoor inlet air flows through the high-temperature and high-humidity solid dehumidifying agent through the air pipe under the action of the fan to perform heat and humidity exchange with the solid dehumidifying agent, the temperature of the solid dehumidifying agent is reduced, adsorbed water vapor is taken away by the outdoor inlet air under the action of concentration difference, the dehumidifying agent completes the regeneration process, the outdoor inlet air is preheated and humidified and then is sent to the first-stage evaporator of the flue gas source heat pump, and the solid dehumidifying agent is transferred back to the dehumidifying area to dry flue gas, so that the process is performed repeatedly; the solid desiccant adopts a porous structure, the dehumidification area is provided with a flue gas flow channel, the regeneration area is provided with an air flow channel, so that the wet flue gas and the solid desiccant, outdoor air inlet and the solid desiccant are fully contacted, the flow resistance is reduced, and the dehumidification and regeneration effects are improved; the moisture meter is arranged behind the dehumidification area and used for detecting the water vapor content in the dehumidified smoke and judging whether the dehumidification device achieves the expected effect.
The invention has the beneficial effects that:
1. the single rotary flue gas dehumidifying device is arranged, and the dual effects of cooling and dehumidifying as well as adsorption and dehumidifying are achieved on the flue gas. The solid desiccant in the rotary flue gas dehumidifying device is in direct contact with wet flue gas, so that the flue gas can be cooled and dehumidified, meanwhile, the solid desiccant can adsorb water vapor in the wet flue gas to change the wet flue gas into dry flue gas, and the dry flue gas enters the second-stage evaporator of the flue gas source heat pump to serve as a heat source of the flue gas source heat pump, so that the pressure of low-temperature corrosion on evaporating equipment materials is greatly reduced, and the operation cost is reduced.
2. The solid desiccant in the rotary flue gas dehumidification device dehumidifies wet flue gas, then the wet flue gas enters a regeneration area to heat and humidify outdoor air, and the heated and humidified hot air enters a first-stage evaporator of a flue gas source heat pump to provide a second heat source for the flue gas source heat pump. The solid dehumidifying agent can be cooled and regenerated, and can be recycled, and the operation and maintenance are convenient.
3. The full heat utilization of the flue gas waste heat is realized, and most sensible heat recovered by the finned tube heat exchanger is used for heating domestic water for people to use in life. After the solid desiccant dries the flue gas, the solid desiccant rotates to a regeneration area to perform heat and humidity exchange with outdoor air, sensible heat and condensation latent heat are transferred to the outdoor air, the outdoor air enters the first-stage evaporator of the flue gas source heat pump to exchange heat with a refrigerant and cool, recovery of water vapor latent heat is achieved, and finally the dehumidified flue gas is used as a heat source of the flue gas source heat pump. The water inlet of the finned tube heat exchanger is connected with the water outlet of the condenser, and the heat emitted by the condenser and the finned tube heat exchanger is used for heating domestic water in a stepped manner, so that the secondary temperature rise of the water is realized. The temperature of the flue gas is reduced to the ambient temperature in the first-stage evaporator and then discharged into the atmosphere, and finally the recycling of the waste heat of the flue gas is realized. The system also effectively eliminates the phenomenon of 'white smoke' in smoke discharge, plays a role in 'white smoke removal' of smoke and reduces the inducement of haze.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic structural diagram of the preferred embodiment of the present invention.
FIG. 2 is a schematic structural diagram of a rotary flue gas dehumidifier according to an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a rotary flue gas dehumidifier according to an embodiment of the present invention.
In the figure: 1. the system comprises a finned tube heat exchanger, 11, fins, 2, a rotary flue gas dehumidification device, 21, a dragging motor, 22, a fan, 23, a dehumidification regenerator, 24, a dehumidifying agent, 25, a dehumidification area, 26, a regeneration area, 27, a shell, 3, a flue gas source heat pump, 31, a first-stage evaporator, 32, a second-stage evaporator, 33, a compressor, 34, a condenser, 35, a throttle valve, 4, a water pipe, 5, a water pump, 6, a flue, 7 and an air pipe.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
As shown in fig. 1, the natural gas flue gas dehumidification waste heat recycling system of the invention comprises a finned tube heat exchanger 1, a rotary flue gas dehumidification device 2 and a flue gas source heat pump 3. The rotary flue gas dehumidifier 2 comprises a driving motor 21, a fan 22, a cylindrical dehumidifying regenerator 23 and a dehumidifying agent 24. The flue gas source heat pump 3 includes a first-stage evaporator 31, a second-stage evaporator 32, a compressor 33, a condenser 34, and a throttle valve 35. Wherein, the tube bundle of the finned tube heat exchanger 1 is additionally provided with uniform fins 11; the flue gas inlet and outlet of the finned tube heat exchanger 1 are respectively positioned at the left end and the right end, the water inlet and outlet of the water are respectively positioned at the lower end and the upper end, and the water inlet of the finned tube heat exchanger 1 and the water outlet of the condenser 34 are connected with the water pump 5 through the water pipe 4.
As shown in fig. 2 and fig. 3, the dehumidifying regenerator 23 of the rotary flue gas dehumidifying apparatus 2 is a cylindrical structure, the dehumidifying regenerator 23 is divided into two parts, namely a dehumidifying area 25 and a regenerating area 26, the dehumidifying area 25 and the regenerating area 26 are surrounded by a cylindrical shell 27, solid dehumidifying agents 24 with compact porous structures are filled in the dehumidifying area 25 and the regenerating area 26, the dehumidifying area 25 has a flue gas flow passage, and the regenerating area 26 has an air flow passage, so that the wet flue gas can be fully contacted with the solid dehumidifying agents and outdoor intake air can be fully contacted with the solid dehumidifying agents, thereby improving dehumidifying and regenerating effects. The flue gas outlet flue 6 of the finned tube heat exchanger 1 is connected with the inlet of the dehumidification area 25 of the rotary flue gas dehumidification device 2. The rotary flue gas dehumidifying device 2 rotates slowly under the action of the dragging motor 21. The inlet of the regeneration zone 26 of the rotary flue gas dehumidification device 2 is connected with the fan 22 through the air pipe 7.
The flue gas source heat pump 3 can be a compression type flue gas source heat pump, an absorption type flue gas source heat pump or other types of flue gas source heat pumps, and the compression type flue gas source heat pump is selected in the embodiment. An inlet of a second-stage evaporator 32 of the flue gas source heat pump 3 is connected with a flue gas outlet of the dehumidification region 25 through a flue 6, an outlet of the second-stage evaporator 32 of the flue gas source heat pump 3 is a flue gas outlet, an inlet of a first-stage evaporator 31 of the flue gas source heat pump 3 is connected with an air outlet of the regeneration region 26 through an air pipe 7, the first-stage evaporator 31 of the flue gas source heat pump 3 and the second-stage evaporator 32 of the flue gas source heat pump 3 can be connected in series or in parallel, and the embodiment selects a series connection mode.
The natural gas flue gas dehumidification waste heat reuse system that this embodiment provided at during operation, the work flow as follows:
1) the flue gas temperature discharged from the tail of a boiler or an industrial furnace is about 120 ℃, the flue gas firstly enters a finned tube heat exchanger 1 to exchange heat with water, the flue gas enters from a flue gas inlet on the left side of the finned tube heat exchanger 1 to exchange heat with the water flowing in from the right lower end of the finned tube heat exchanger 1, the water and the flue gas are subjected to countercurrent heat exchange, the flue gas flows out from an outlet on the right side of the finned tube heat exchanger 1 after the water-flue gas heat exchange is completed, most sensible heat of the flue gas is absorbed by the water, the heated water flows out from an outlet on the upper left portion of the finned tube heat exchanger 1 to supply heat to.
2) The wet flue gas flowing out from the right outlet of the finned tube heat exchanger 1 flows into the dehumidification area 25 of the rotary flue gas dehumidification device 2 from the flue 6 to be in direct contact with the solid desiccant 24, the flue gas is cooled and dehumidified firstly, and because the partial pressure of the water vapor in the solid desiccant 24 is far smaller than the partial pressure of the water vapor in the wet flue gas, the water vapor in the flue gas can be transferred to the surface of the solid desiccant 24 under the pushing of concentration difference, the heat and mass exchange is completed, the drying and cooling of the wet flue gas are realized, and the moisture content of the wet flue gas is greatly reduced, so that the dehumidification process is completed. A hygrometer (not shown) is arranged behind the dehumidification area 25 to detect the water vapor content in the dehumidified flue gas and see whether the rotary flue gas dehumidification device 2 achieves the expected effect. And then, the dry flue gas flowing out of the outlet of the dehumidification area 25 flows into the second-stage evaporator 32 of the flue gas source heat pump 3 through the flue 6, and is continuously subjected to heat exchange with the refrigerant for cooling, and the dry flue gas is discharged into the atmosphere through the flue gas outlet when the temperature is reduced to be close to the ambient temperature.
3) Meanwhile, in the dehumidification process, when the solid desiccant 24 adsorbs water vapor in the dehumidification area 25 to reach a saturated state, the rotary flue gas dehumidification device 2 enters the regeneration area 26 to be desorbed and regenerated under the driving of the dragging motor 21, outdoor inlet air flows through the high-temperature and high-humidity solid desiccant 24 through the air pipe 7 under the action of the fan 22 to perform heat and humidity exchange with the solid desiccant, the temperature of the solid desiccant 24 is reduced, the adsorbed water vapor is taken away by the outdoor inlet air under the action of concentration difference, the solid desiccant 24 completes the regeneration process, and then the solid desiccant 25 is transferred back to the dehumidification area 25 to dry the flue gas and perform the process repeatedly.
4) When the solid desiccant 24 completes regeneration, outdoor inlet air is also heated and humidified to form hot and humid air, and the hot and humid air flows into the first-stage evaporator 31 of the flue gas source heat pump 3 from the outlet of the regeneration area 26 through the air pipe 7 to exchange heat with the refrigerant and reduce the temperature to the ambient temperature. The hot and humid air and the dry flue gas are used as double heat sources of the flue gas source heat pump 3, and the two evaporators in the embodiment are arranged in series, so that the gradient utilization of the heat of the air and the flue gas can be realized. Cold water enters from a water inlet of the condenser 34, heat generated by the condenser 34 heats the cold water, and the heated water flows out from a water outlet of the condenser 34, enters the finned tube heat exchanger 1 through the water pipe 4 under the action of the water pump 5, and exchanges heat with flue gas to finish secondary temperature rise of the water. The steps 1) to 4) finish the total heat recovery process of the flue gas waste heat.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims (7)

1. The utility model provides a natural gas flue gas dehumidification waste heat system of recycling which characterized in that: comprises a finned tube heat exchanger (1), a rotary flue gas dehumidifier (2) and a flue gas source heat pump (3); the rotary flue gas dehumidification device (2) comprises a dragging motor (21), a dehumidification regenerator (23) and a fan (22), wherein a dehumidification area (25) and a regeneration area (26) are arranged in the dehumidification regenerator (23), and a dehumidifying agent (24) is filled in the dehumidification area (25) and the regeneration area (26); a flue gas outlet of the finned tube heat exchanger (1) is connected to a flue gas inlet of the dehumidification area (25), and a flue gas outlet of the dehumidification area (25) is connected to the flue gas source heat pump (3); the air inlet of the regeneration zone (26) is connected to a fan (22), and the air outlet of the regeneration zone (26) is connected to a flue gas source heat pump (3); the driving motor (21) drives the dehumidifying regenerator (23) to axially rotate, and the rotation of the dehumidifying agent (24) in the dehumidifying area (25) and the regenerating area (26) is realized.
2. The natural gas flue gas dehumidification waste heat reuse system of claim 1, characterized in that: the flue gas source heat pump (3) comprises a first-stage evaporator (31), a second-stage evaporator (32), a compressor (33), a condenser (34) and a throttle valve (35), wherein an inlet of the first-stage evaporator (31) is communicated with an air outlet of a regeneration area (26) through an air pipe (7), an outlet of the first-stage evaporator (31) is connected to the second-stage evaporator (32), a flue gas outlet of a dehumidification area (25) is connected to the second-stage evaporator (32) through a flue (6), the second-stage evaporator (32) is connected to the compressor (33), the compressor (33) and the condenser (34) are sequentially connected, an outlet of the condenser (34) returns to the first-stage evaporator (31) through a pipeline, and the throttle valve (35) is further arranged on the pipeline between the condenser (34) and the first-stage evaporator (31).
3. The natural gas flue gas dehumidification waste heat reuse system of claim 2, characterized in that: the flue gas inlet and the flue gas outlet of the finned tube heat exchanger (1) are respectively positioned at the left end and the right end, and the flue gas inlet of the finned tube heat exchanger (1) is connected with the flue gas outlet of a natural gas burning boiler or an industrial furnace; the water inlet of the finned tube heat exchanger (1) is positioned at the lower right end, the water outlet is positioned at the upper left end, the water inlet of the finned tube heat exchanger (1) is connected with the water outlet of the condenser (34) through a water pipe (4), and a water pump (5) is arranged on the water pipe (4).
4. The natural gas flue gas dehumidification waste heat reuse system of claim 1, characterized in that: fins (11) are additionally arranged on the tube bundle of the finned tube heat exchanger (1).
5. The natural gas flue gas dehumidification waste heat reuse system of claim 1, characterized in that: a hygrometer is arranged in the dehumidification area (25).
6. The natural gas flue gas dehumidification waste heat reuse system of claim 1, characterized in that: the desiccant (24) is a dense porous structure.
7. The natural gas flue gas dehumidification waste heat reuse system of claim 1, characterized in that: the smoke source heat pump (3) is a compression type smoke source heat pump or an absorption type smoke source heat pump.
CN201811421177.3A 2018-11-27 2018-11-27 Natural gas flue gas dehumidification waste heat reutilization system Active CN109579038B (en)

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