CN110906490A - Oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function - Google Patents

Oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function Download PDF

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CN110906490A
CN110906490A CN201911140604.5A CN201911140604A CN110906490A CN 110906490 A CN110906490 A CN 110906490A CN 201911140604 A CN201911140604 A CN 201911140604A CN 110906490 A CN110906490 A CN 110906490A
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air
module
oxygen
carbon dioxide
enriched
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CN110906490B (en
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祝铃钰
高静雨
陶坚
章渊昶
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/147—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with both heat and humidity transfer between supplied and exhausted air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/60—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by adding oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/70—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/76—Oxygen
    • 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]
    • Y02B30/56—Heat recovery units

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function comprises an air mixing module (I), a filtering and purifying module (II), an air compression module (III), an air heat exchange module (IV), a humidity adjusting module (V), an air exhaust module (VI), a flow dividing and pressurizing module (VII) and a membrane separation module (VIII); the air mixing module (I) is connected with the filtering and purifying module (II), the filtering and purifying module (II) is connected with the air compression module (III), the air compression module (III) and the air exhaust module (VI) are both connected with the air heat exchange module (IV), the air heat exchange module (IV) is respectively connected with the humidity adjusting module (V) and the shunting pressurization module, and the shunting pressurization module is connected with the membrane separation module. The invention can enrich oxygen and remove carbon dioxide from indoor air through membrane separation to stabilize the normal oxygen and carbon dioxide concentration in the indoor air, and can recover waste gas waste heat and reduce fresh air supply rate to reduce energy consumption.

Description

Oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function
Technical Field
The invention belongs to the field of environment and resources, and particularly relates to a fresh air system with a function of oxygen enrichment and carbon dioxide removal and with a function of waste heat recovery.
Background
In the era of the rapid development and the technological revolution, the living standard of people gradually rises, and closed public buildings such as shopping malls, office buildings, hotels, entertainment places and the like with dense personnel are constructed in large quantities, and the places have high crowd density and poor air circulation and cannot supplement fresh air in time. Along with the continuous reduction of the indoor oxygen content and the gradual rise of the carbon dioxide content, people can have symptoms of chest distress, dizziness, limb weakness and the like, and the harm of the environment to the human health is self evident.
In order to guarantee the requirements of people on the indoor air quality, fresh air systems are installed in more and more places. The fresh air system mainly utilizes modes such as high wind pressure, large-flow fan, mechanical strength and the like to convey outdoor fresh air to the indoor, and simultaneously carries out pretreatment operations such as filtration, sterilization, disinfection, preheating (precooling), humidity exchange and the like on the fresh air, and dirty air is discharged to the outdoor through an indoor exhaust fan to ensure the freshness of the air. Generally, in order to recover energy, outdoor fresh air and indoor dirty air pass through a high-performance heat converter to effectively recover partial energy in the dirty air, and then the energy is stored in an energy storage device and then is transmitted to the fresh air.
The existing common fresh air system directly discharges all indoor air outdoors during ventilation, the larger the fresh air supply quantity is, the higher the fresh air load is, and the larger the corresponding fresh air energy loss is.
The application number is CN201120172274 discloses a new fan of oxygen boosting, and the oxygen input that separates through outdoor oxygenerator is indoor, replaces indoor some contaminated air, though can reduce the new trend air feed volume, this new fan of oxygen boosting oxygen concentration is unregulated, and the too high oxygen of respiratory concentration can cause the intoxication oxygen, still can have the too high problem of carbon dioxide concentration simultaneously.
For the problems existing in the fresh air system, it is necessary to develop a low-energy-consumption fresh air system which can reduce the fresh air supply quantity and stabilize the indoor normal oxygen concentration and carbon dioxide concentration.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the oxygen-enriched carbon dioxide-removing fresh air system with the function of waste heat recovery, which can enrich oxygen and remove carbon dioxide from indoor air through membrane separation to stabilize the normal indoor oxygen and carbon dioxide concentrations, and can recover waste gas waste heat and reduce the fresh air supply rate to reduce energy consumption.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function comprises an air mixing module (I), a filtering and purifying module (II), an air compression module (III), an air heat exchange module (IV), a humidity adjusting module (V), an air exhaust module (VI), a flow dividing and pressurizing module (VII) and a membrane separation module (VIII); the air mixing module (I) is connected with the filtering and purifying module (II), the filtering and purifying module (II) is connected with the air compression module (III), the air compression module (III) and the air exhaust module (VI) are both connected with the air heat exchange module (IV), the air heat exchange module (IV) is respectively connected with the humidity adjusting module (V) and the shunting pressurization module (VII), and the shunting pressurization module (VII) is connected with the membrane separation module (VIII).
Further, the air mixing module comprises a gas mixer and an exhaust silencer, an air inlet pipeline of the air mixing module is connected with an outdoor air pipeline, an oxygen-enriched air pipeline, a carbon dioxide-poor air pipeline and a backflow air pipeline, an outlet of the air mixing module is connected with an inlet of the filtering and purifying module, and the exhaust silencer is arranged at the outlet of the air mixing module.
Still further, the filtration purification module includes air cleaner and air purifier, and air cleaner's export and air purifier's access connection, air purifier's export links to each other with the import of air compression module. Dust and fiber in the air are primarily filtered through an air filter, and formaldehyde, PM2.5, sulfur dioxide and the like in the air are efficiently removed through an air purifier, so that the air is kept pure.
The air compression module comprises a high-pressure fan and a safety valve, an outlet of the air compression module is connected with an inlet of the air heat exchange module, and the safety valve is arranged at the outlet. And when the pressure exceeds a safety value, opening the safety valve to release the pressure.
The air heat exchange module comprises a high-efficiency heat exchanger and an exhaust silencer, a fresh air pipeline and an air pipeline to be processed are arranged in the high-efficiency heat exchanger, and the exhaust silencer is arranged at an outlet.
The humidity adjusting module is a humidifier, a fresh air pipeline outlet of the efficient heat exchanger is connected with an inlet of the humidifier, and an outlet of the humidifier is connected with the indoor space.
Preferably, two gas concentration detectors, a temperature detector and a humidity detector are arranged on a pipeline through which air enters the room, the gas concentration detectors detect the concentrations of oxygen and carbon dioxide respectively, and the oxygen and carbon dioxide concentration contents in the air are controlled to reach the standard by adjusting the air flow rates of the oxygen-enriched membrane removing component and the carbon dioxide removing membrane component in the shunting and pressurizing module; the temperature detector detects the air temperature, and the temperature reaches the standard by adjusting the flow of the return air; the humidity detector detects air humidity, and the air humidity reaches the standard by adjusting the working state of the humidifier.
The air exhaust module is an exhaust fan, an inlet of the air exhaust module is connected with the indoor space, an outlet of the air exhaust module is connected with the air heat exchange module, and a safety valve is arranged at the outlet. And when the pressure exceeds a safety value, opening the safety valve to release the pressure.
The flow dividing and pressurizing module comprises a flow divider, an oil-free air compressor, a safety valve, a compressor cooler and a flow control valve, wherein an outlet of an air pipeline to be processed of the high-efficiency heat exchanger is connected with an inlet of the flow divider, and an outlet of the flow divider is respectively connected with an air discharge port, an inlet of the oil-free air compressor and a return air pipeline after passing through a flow control valve; the outlet of the oil-free air compressor is connected with the inlet of the compressor cooler through a safety valve, and the outlet of the compressor cooler is connected with the inlet of the membrane separation module through a flow control valve.
The membrane separation module comprises an oxygen-enriched membrane module and a carbon dioxide removal membrane module, the oxygen-enriched membrane module is a rubber polymer hollow fiber membrane module and is provided with an oxygen-enriched air pipeline and an oxygen-deficient air pipeline, and the oxygen-enriched air pipeline is connected with an inlet of the air mixing module; the carbon dioxide removing membrane component is a polyethylene oxide film hollow fiber membrane component and is provided with a carbon dioxide poor air pipeline and a carbon dioxide rich air pipeline, and the carbon dioxide poor air pipeline is connected with an inlet of the air mixing module.
The oxygen-enriched air generated by the membrane separation module, the carbon dioxide-poor air, the fresh air and the return air are mixed to reach the standard concentration range of air and are circulated back to the room for people to breathe.
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the problem that the traditional fresh air system can not efficiently recycle indoor air, the oxygen-rich membrane can usually enrich carbon dioxide while enriching oxygen, the carbon dioxide-removing membrane can reduce the concentration of carbon dioxide and the concentration of oxygen, the mixed air and the fresh air enter the air mixing system to be recycled into the room to reduce the air supply amount of the fresh air by carrying out oxygen enrichment and carbon dioxide removal on the indoor air and mixing the mixed air and the fresh air to reach the standard concentration range of the air, thereby reducing the energy consumption of the fresh air system.
The oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function is reasonable in design, can reduce fresh air supply quantity and stabilize indoor normal oxygen concentration and carbon dioxide concentration, controls air indexes such as oxygen concentration, carbon dioxide concentration and humidity of indoor air, improves indoor air quality, and meets the requirement of people for breathing high-quality air indoors.
Drawings
FIG. 1 is a schematic diagram of a fresh air system with waste heat recovery for oxygen enrichment and carbon dioxide removal. I, an air mixing module: 1-a gas mixer; 2-exhaust muffler; II, a filtering and purifying module: 3-an air filter; 4-an air purifier; III, air compression module: 5-high pressure fan; 6-safety valve; IV, air heat exchange module: 7-high efficiency heat exchanger; 8. 9-exhaust muffler; v, a humidity adjusting module: 10-a humidifier; VI, an air exhaust module: 11-an exhaust fan; 12-a safety valve; VII, a flow dividing and pressurizing module: 13-a flow divider; 14-oil-free air compressor; 15-safety valve; 16-a compressor cooler; 17-19-flow regulating valve; VIII membrane separation module: 20-an oxygen-enriched membrane module; 21-a carbon dioxide removal membrane module; a control loop: 22-temperature detector; 23. 24-a gas concentration detector; 25-humidity detector.
Detailed Description
Embodiments of the invention are described in detail below with reference to the following figures:
referring to fig. 1, an oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery comprises an air mixing module (I), a filtering and purifying module (II), an air compression module (III), an air heat exchange module (IV), a humidity adjusting module (V), an air exhaust module (VI), a flow dividing and pressurizing module (VII) and a membrane separation module (VIII); the air mixing module (I) is connected with the filtering and purifying module (II), the filtering and purifying module (II) is connected with the air compression module (III), the air compression module (III) and the air exhaust module (VI) are both connected with the air heat exchange module (IV), the air heat exchange module (IV) is respectively connected with the humidity adjusting module (V) and the shunting pressurization module (VII), and the shunting pressurization module (VII) is connected with the membrane separation module (VIII).
Further, the air mixing module comprises a gas mixer and an exhaust silencer, an air inlet pipeline of the air mixing module is connected with an outdoor air pipeline, an oxygen-enriched air pipeline, a carbon dioxide-poor air pipeline and a backflow air pipeline, an outlet of the air mixing module is connected with an inlet of the filtering and purifying module, and the exhaust silencer is arranged at the outlet of the air mixing module.
Still further, the filtration purification module includes air cleaner and air purifier, and air cleaner's export and air purifier's access connection, air purifier's export links to each other with the import of air compression module. Dust and fiber in the air are primarily filtered through an air filter, and formaldehyde, PM2.5, sulfur dioxide and the like in the air are efficiently removed through an air purifier, so that the air is kept pure.
The air compression module comprises a high-pressure fan and a safety valve, an outlet of the air compression module is connected with an inlet of the air heat exchange module, and the safety valve is arranged at the outlet. And when the pressure exceeds a safety value, opening the safety valve to release the pressure.
The air heat exchange module comprises a high-efficiency heat exchanger and an exhaust silencer, a fresh air pipeline and an air pipeline to be processed are arranged in the high-efficiency heat exchanger, and the exhaust silencer is arranged at an outlet.
The humidity adjusting module is a humidifier, a fresh air pipeline outlet of the efficient heat exchanger is connected with an inlet of the humidifier, and an outlet of the humidifier is connected with the indoor space.
Preferably, two gas concentration detectors, a temperature detector and a humidity detector are arranged on a pipeline through which air enters the room, the gas concentration detectors detect the concentrations of oxygen and carbon dioxide respectively, and the oxygen and carbon dioxide concentration contents in the air are controlled to reach the standard by adjusting the air flow rates of the oxygen-enriched membrane removing component and the carbon dioxide removing membrane component in the shunting and pressurizing module; the temperature detector detects the air temperature, and the temperature reaches the standard by adjusting the flow of the return air; the humidity detector detects air humidity, and the air humidity reaches the standard by adjusting the working state of the humidifier.
The air exhaust module is an exhaust fan, an inlet of the air exhaust module is connected with the indoor space, an outlet of the air exhaust module is connected with the air heat exchange module, and a safety valve is arranged at the outlet. And when the pressure exceeds a safety value, opening the safety valve to release the pressure.
The flow dividing and pressurizing module comprises a flow divider, an oil-free air compressor, a safety valve, a compressor cooler and a flow control valve, wherein an outlet of an air pipeline to be processed of the high-efficiency heat exchanger is connected with an inlet of the flow divider, and an outlet of the flow divider is respectively connected with an air discharge port, an inlet of the oil-free air compressor and a return air pipeline after passing through a flow control valve; the outlet of the oil-free air compressor is connected with the inlet of the compressor cooler through a safety valve, and the outlet of the compressor cooler is connected with the inlet of the membrane separation module through a flow control valve.
The membrane separation module comprises an oxygen-enriched membrane module and a carbon dioxide removal membrane module, the oxygen-enriched membrane module is a rubber polymer hollow fiber membrane module and is provided with an oxygen-enriched air pipeline and an oxygen-deficient air pipeline, and the oxygen-enriched air pipeline is connected with an inlet of the air mixing module; the carbon dioxide removing membrane component is a polyethylene oxide film hollow fiber membrane component and is provided with a carbon dioxide poor air pipeline and a carbon dioxide rich air pipeline, and the carbon dioxide poor air pipeline is connected with an inlet of the air mixing module.
The oxygen-enriched air generated by the membrane separation module, the carbon dioxide-poor air, the fresh air and the return air are mixed to reach the standard concentration range of air and are circulated back to the room for people to breathe.
The working principle of the invention is as follows: and a high-pressure fan of the air compression module (III) is started to increase the pressure of gas in the system, so that the effect of air induction is achieved. Fresh air entering from the outside enters the gas mixer through an air inlet pipeline of the air mixing module (I), is fully mixed with oxygen-enriched air, lean carbon dioxide air and backflow air, enters the filtering and purifying module (II), is subjected to primary dust filtration through an air filter, and is subjected to removal of harmful gases such as formaldehyde, sulfur dioxide and the like and PM2.5 through an air purifier. The filtered and purified air enters the air compression module (III), and enters the air heat exchange module (IV) after being pressurized, so that the air exchanges heat with the indoor discharged air to be treated, and the effects of recovering waste heat and preheating/precooling fresh air are achieved. And the air after heat exchange is sent to a humidity adjusting module (V). Air with proper humidity is sent into the room for people to breathe. The indoor temperature is controlled by the central air conditioner. The air exhaust module (VI) extracts indoor air to be processed and sends the air to the air heat exchange module (IV) to exchange heat with fresh air. The heat exchange air enters a flow dividing and pressurizing module (VII), after pressurization, the flow divider divides the air into two flows, one flow is sent to the oil-free air compressor for pressurization, the other flow is divided into two flows, one flow is used as return air and sent back to the air mixing module, and the other flow is used as exhaust air and discharged to the outside. The pressurized air is also divided into two streams, one stream enters the oxygen-enriched membrane module of the membrane separation module (VIII), and the other stream enters the carbon dioxide removal membrane module of the membrane separation module. After being processed by the membrane separation module, the air to be processed is divided into oxygen-enriched air, oxygen-poor air, carbon dioxide-enriched air and carbon dioxide-poor air, the oxygen-poor air and the carbon dioxide-enriched air are directly discharged to the outdoor, and the oxygen-enriched air and the carbon dioxide-poor air enter the air mixing module to be mixed with fresh air, so that the gas circulation of the system is completed.
The working principle of the embodiment is as follows: the high pressure positive blower of air compression module starts, increases the pressure of gaseous in the system, plays the effect of induced air. Fresh air entering from the outside enters the gas mixer through an air inlet pipeline of the air mixing module, is fully mixed with oxygen-enriched air, poor carbon dioxide air and backflow air, enters the filtering and purifying module, is primarily filtered for dust through an air filter, and is then subjected to air purifier to remove harmful gases such as formaldehyde, sulfur dioxide and the like and PM 2.5. The filtered and purified air enters the air compression module, and enters the air heat exchange module after being pressurized to exchange heat with the indoor discharged air to be treated, so that the effects of recovering waste heat and preheating/precooling fresh air are achieved. And sending the air after heat exchange into a humidity adjusting module. Air with proper humidity is sent into the room for people to breathe. The indoor temperature is controlled by the central air conditioner. The air exhaust module extracts indoor air to be processed and sends the air to the air heat exchange module to exchange heat with fresh air. The air enters a flow dividing and pressurizing module after heat exchange, the flow divider divides the air into two flows after pressurization, one flow is sent to an oil-free air compressor for pressurization, the other flow is divided into two flows, one flow is used as return air and sent back to the air mixing module, and the other flow is used as exhaust air and discharged outdoors. The pressurized air is also divided into two streams, one stream enters the oxygen-enriched membrane component of the membrane separation module, and the other stream enters the carbon dioxide removal membrane component of the membrane separation module. After being processed by the membrane separation module, the air to be processed is divided into oxygen-enriched air, oxygen-poor air, carbon dioxide-enriched air and carbon dioxide-poor air, the oxygen-poor air and the carbon dioxide-enriched air are directly discharged to the outdoor, and the oxygen-enriched air and the carbon dioxide-poor air enter the air mixing module to be mixed with fresh air, so that the gas circulation of the system is completed.
Example 1:
in this example, the season is summer, the outdoor average temperature is 35 ℃, the indoor central air-conditioning temperature is set to 25 ℃, and the total oxygen consumption of indoor people is 100Nm3/h。
Starting a high-pressure fan of the air compression module (III), pressurizing air, sucking outdoor fresh air into the air mixing module (I) by utilizing pressure difference, wherein the fresh air intake is about 5000Nm3H, temperature 35 ℃. Completely mixing with oxygen-enriched air, carbon dioxide-depleted air and return air generated by the membrane separation module (VIII), and cooling the mixed air to 31.1 deg.C at 22881.9Nm3The oxygen content and the carbon dioxide content were about 20.1% and 0.4%, respectively. The mixed air enters a filtering and purifying module (II) to remove solid particles such as dust, PM2.5 and the like and impurities such as sulfur dioxide, formaldehyde and the like. The filtered and purified air passes through the air compression module (III) and the air heat exchange module (IV) in sequence, the temperature is about 26 ℃ after heat exchange, and the filtered and purified air is delivered into the room for people to breathe after passing through the humidity adjusting module (V). The indoor temperature is controlled by the central air conditioner to be about 25 ℃.
The air exhaust module (VI) extracts air to be treated from the room, wherein the oxygen content is about 19.7 percent, the carbon dioxide content is about 1 percent, the temperature is 25 ℃, the air is sent into the air heat exchange module (IV) to recycle cold energy, and the temperature is about 30 ℃ after reheating. The air to be treated after reheating enters a flow dividing and pressurizing module (VII), the air is divided into two parts through an air flow divider, the air to be treated is sent to an oil-free air compressor to be pressurized, the temperature of the air is reduced to about 30 ℃ through a compressor cooler, and the air to be treated is divided into two parts, namely an oxygen-enriched membrane component and a carbon dioxide-removing membrane component. The split ratio is oxygen removal: removing carbon dioxide: untreated ═ 0.07: 0.35: 0.58, 75% of the untreated air is taken out and returned to the air mixing module (I) as return air, and the rest is discharged to the outside as exhaust gas. The membrane separation module (VIII) takes a certain pressure difference as a driving force to separate the dirty air, gases with high permeability coefficients such as water vapor, carbon dioxide and oxygen permeate the gas separation membrane quickly and are enriched in a permeable phase of the gas separation membrane, and most gases with low permeability coefficients such as nitrogen do not permeate the gas separation membrane and are enriched in a permeable phase of the gas separation membrane. The oxygen concentration of the oxygen-enriched air obtained by the oxygen-enriched membrane module is about 65.5 percent, the carbon dioxide concentration is about 4.8 percent, and the oxygen concentration of the carbon dioxide-depleted air obtained by the carbon dioxide removal membrane module is about 18.5 percent, and the carbon dioxide concentration is about 0.001 percent. The oxygen-enriched air and the carbon dioxide-depleted air enter an air mixing module (I), and the oxygen-depleted air and the carbon dioxide-enriched air are discharged outdoors.
Example 2:
in this example, the season is winter, the outdoor average temperature is 5 ℃, the indoor central air-conditioning temperature is set to 25 ℃, and the total oxygen consumption of the indoor population is 250Nm3/h。
Starting a high-pressure fan of the air compression module (III), pressurizing air, sucking outdoor fresh air into the air mixing module (I) by utilizing pressure difference, wherein the fresh air intake is about 5000Nm3H, temperature 5 ℃. Is completely mixed with the oxygen-enriched air, the carbon dioxide-depleted air and the return air generated by the membrane separation module (VIII), the temperature of the mixed air is raised to 8.6 ℃, and the flow rate is 22642Nm3The oxygen content and the carbon dioxide content were about 20.6% and 0.5%, respectively. The mixed air enters a filtering and purifying module (II) to remove solid particles such as dust, PM2.5 and the like and impurities such as sulfur dioxide, formaldehyde and the like. The filtered and purified air passes through the air compression module (III) and the air heat exchange module (IV) in sequence, the temperature is about 23 ℃ after heat exchange, and the filtered and purified air is delivered into the room for people to breathe after passing through the humidity adjusting module (V). The indoor temperature is controlled by the central air conditioner to be about 25 ℃.
The air exhaust module (VI) extracts air to be treated from the room, wherein the oxygen content is about 19.5 percent, the carbon dioxide content is about 1.6 percent, the temperature is 25 ℃, the air is sent into the air heat exchange module (IV) to recover heat, and the temperature is about 10.6 ℃ after heat exchange. The air to be treated after heat exchange enters a flow dividing and pressurizing module (VII), is divided into two parts through an air flow divider, the air to be treated is sent to an oil-free air compressor for pressurization, is cooled to about 10 ℃ through a compressor cooler, is divided into two parts, and is respectively subjected to oxygen enrichment membrane component removal and carbon dioxide membrane component removal. The split ratio is oxygen removal: removing carbon dioxide: untreated — 0.18: 0.65: 0.17, 70% of the untreated air is taken out and returned to the air mixing module (I) as return air, and the rest is discharged to the outside as exhaust air. The membrane separation module (VIII) takes a certain pressure difference as a driving force to separate the dirty air, gases with high permeability coefficients such as water vapor, carbon dioxide and oxygen permeate the gas separation membrane quickly and are enriched in a permeable phase of the gas separation membrane, and most gases with low permeability coefficients such as nitrogen do not permeate the gas separation membrane and are enriched in a permeable phase of the gas separation membrane. The oxygen concentration of the oxygen-enriched air obtained by the oxygen-enriched membrane module is about 63.2 percent, the carbon dioxide concentration is about 8.4 percent, the oxygen concentration of the carbon dioxide-depleted air obtained by the carbon dioxide removal membrane module is about 18.4 percent, and the carbon dioxide concentration is about 0.001 percent. The oxygen-enriched air and the carbon dioxide-depleted air enter an air mixing module (I), and the oxygen-depleted air and the carbon dioxide-enriched air are discharged outdoors.
The invention solves the problem that the traditional fresh air system can not efficiently recycle the indoor air, the air mixing system can reduce the air supply amount of the fresh air by carrying out oxygen enrichment and carbon dioxide removal on the indoor air, the mixed air and the fresh air enter the air mixing system together to be circulated back to the indoor, and the heat exchange system realizes the heat/cold energy recovery of the indoor exhaust air, is used for preheating/cooling the fresh air and reduces the energy consumption of the fresh air system.
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.

Claims (10)

1. The oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function is characterized by comprising an air mixing module (I), a filtering and purifying module (II), an air compression module (III), an air heat exchange module (IV), a humidity adjusting module (V), an air exhaust module (VI), a flow dividing and pressurizing module (VII) and a membrane separation module (VIII); the air mixing module (I) is connected with the filtering and purifying module (II), the filtering and purifying module (II) is connected with the air compression module (III), the air compression module (III) and the air exhaust module (VI) are both connected with the air heat exchange module (IV), the air heat exchange module (IV) is respectively connected with the humidity adjusting module (V) and the shunting pressurization module (VII), and the shunting pressurization module (VII) is connected with the membrane separation module (VIII).
2. The oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function as claimed in claim 1, wherein the air mixing module comprises a gas mixer and an exhaust silencer, an air inlet pipeline of the air mixing module is connected with an outdoor air, an oxygen-enriched air pipeline, a carbon dioxide-poor air pipeline and a backflow air pipeline, an outlet of the air mixing module is connected with an inlet of the filtering and purifying module, and the exhaust silencer is arranged at the outlet of the air mixing module.
3. An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function as claimed in claim 1 or 2, wherein the filtering and purifying module comprises an air filter and an air purifier, the outlet of the air filter is connected with the inlet of the air purifier, and the outlet of the air purifier is connected with the inlet of the air compressing module.
4. An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery as claimed in claim 1 or 2, wherein the air pressure module comprises a high pressure fan and a safety valve, the outlet of the air pressure module is connected with the inlet of the air heat exchange module, and the outlet is provided with the safety valve.
5. An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery as claimed in claim 1 or 2, wherein the air heat exchange module comprises a high-efficiency heat exchanger and an exhaust silencer, a fresh air pipeline and an air pipeline to be treated are arranged in the high-efficiency heat exchanger, and the exhaust silencer is arranged at an outlet.
6. An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery as claimed in claim 1 or 2, wherein the humidity adjusting module is a humidifier, the outlet of the fresh air pipeline of the high-efficiency heat exchanger is connected with the inlet of the humidifier, and the outlet of the humidifier is connected with the indoor.
7. An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery as claimed in claim 6, wherein two gas concentration detectors, a temperature detector and a humidity detector are arranged on the pipeline of the air inlet chamber, the gas concentration detectors detect the concentrations of oxygen and carbon dioxide respectively, and the oxygen and carbon dioxide concentration contents in the air are controlled to reach the standard by adjusting the air flow rates of the oxygen-enriched membrane removing module and the carbon dioxide removing module in the split-flow pressurizing module; the temperature detector detects the air temperature, and the temperature reaches the standard by adjusting the flow of the return air; the humidity detector detects air humidity, and the air humidity reaches the standard by adjusting the working state of the humidifier.
8. An oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery as claimed in claim 1 or 2, wherein the exhaust module is an exhaust fan, the inlet of the exhaust module is connected with the indoor, the outlet of the exhaust module is connected with the air heat exchange module, and the outlet is provided with a safety valve. And when the pressure exceeds a safety value, opening the safety valve to release the pressure.
9. The oxygen-enriched carbon dioxide-removing fresh air system with waste heat recovery function as claimed in claim 1 or 2, wherein the flow dividing and pressurizing module comprises a flow divider, an oil-free air compressor, a safety valve, a compressor cooler and a flow control valve, an outlet of the air pipeline to be treated of the high-efficiency heat exchanger is connected with an inlet of the flow divider, and an outlet of the flow divider is respectively connected with an air discharge port, an inlet of the oil-free air compressor and a return air pipeline after passing through the flow control valve; the outlet of the oil-free air compressor is connected with the inlet of the compressor cooler through a safety valve, and the outlet of the compressor cooler is connected with the inlet of the membrane separation module through a flow control valve.
10. The oxygen-enriched carbon dioxide removal fresh air system with waste heat recovery function as claimed in claim 1 or 2, wherein the membrane separation module comprises an oxygen-enriched membrane module and a carbon dioxide removal membrane module, the oxygen-enriched membrane module is a rubbery polymer hollow fiber membrane module and is provided with an oxygen-enriched air pipeline and an oxygen-depleted air pipeline, and the oxygen-enriched air pipeline is connected with an inlet of the air mixing module; the carbon dioxide removing membrane component is a polyethylene oxide film hollow fiber membrane component and is provided with a carbon dioxide poor air pipeline and a carbon dioxide rich air pipeline, and the carbon dioxide poor air pipeline is connected with an inlet of the air mixing module.
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