CN110917814A - Printing industry and other trades energy saving and emission reduction exhaust treatment system who discharges VOCs waste gas - Google Patents
Printing industry and other trades energy saving and emission reduction exhaust treatment system who discharges VOCs waste gas Download PDFInfo
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- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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- 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
- B01D53/002—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 by condensation
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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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
- 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
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The embodiment of the invention discloses an energy-saving emission-reduction waste gas treatment system for printing industry and other industries for discharging VOCs waste gas, which is based on a zero-emission framework and comprises the following components: the system comprises a VOCs waste gas pretreatment device, a rotating wheel adsorption or molecular sieve adsorption or activated carbon adsorption device, a desorption regeneration and high-concentration desorption gas treatment device and a circulation treatment device, wherein the VOCs waste gas pretreatment device comprises a filtering and purifying device and a heat exchanger, the rotating wheel adsorption or molecular sieve adsorption or activated carbon adsorption device comprises an adsorption area and a regeneration desorption area, the high-concentration desorption gas treatment device comprises a microwave heating device or an electric heating device and a catalytic combustion device or a condensation recovery device, the circulation treatment device is used for treating the purified gas and then sending the treated gas into the heat exchange device, further realizing system circulation after the energy of the purified gas is exchanged with the energy of the discharged gas, and conveying the purified gas back to a workshop. Greatly reducing the production and operation cost.
Description
Technical Field
The embodiment of the application relates to the technical field of waste gas treatment, in particular to an energy-saving and emission-reducing waste gas treatment system for the printing industry and other industries for discharging VOCs waste gas.
Background
Along with the acceleration of the urbanization process of China, the living standard of people is continuously improved, the environmental awareness of people is continuously enhanced, the requirements on the ecological environment are higher and higher, the pressure of traditional industrial environment protection upgrading is higher and higher, and the social responsibility of enterprises is stronger and higher.
A large number of various printing enterprises, no matter offset printing, copperplate printing, or screen printing equipment, can produce a large amount of VOCs waste gas with low concentration and large air volume in the production process, and the waste gas containing organic gas components is high in equipment cost required to be recovered due to low concentration.
The existing waste gas treatment mode has low energy utilization rate, can not realize circular treatment and needs improvement.
Disclosure of Invention
The embodiment of the invention provides an energy-saving emission-reducing waste gas treatment system for printing industry and other industries discharging VOCs waste gas, which is also suitable for air displacement type production systems and other industries of places generating low-concentration VOCs waste gas, and the system is based on the energy-saving emission-reducing and waste gas circulation treatment system of a zero emission framework, so that a brand-new thinking mode and a technical idea are provided, the backward thinking mode of 'after treatment' is completely abandoned in the mode of coping with the atmospheric environmental pollution to the traditional industrial production technology process and the industrial production technology process which is already or to be upgraded, the problem of maximally recycling the wasted energy in the industrial production and social activities generating the waste gas pollution is fundamentally solved, the original waste gas discharging the polluted environment is subjected to the circulation treatment to the maximum extent, and the invention of the energy-saving emission-reducing and waste gas circulation treatment system based on the zero emission framework can be considered, is the subversion of the existing air pollution prevention and control concept and is a revolution in the field of air pollution prevention and control.
The embodiment of the invention provides an energy-saving emission-reduction waste gas treatment system for printing industry and other industries for discharging VOCs waste gas, which comprises: the device comprises a VOCs waste gas pretreatment device, a runner adsorption or molecular sieve adsorption or activated carbon adsorption device, a desorption regeneration and high-concentration desorption gas treatment device and a circulation treatment device, wherein the VOCs waste gas pretreatment device is connected with the runner adsorption or molecular sieve adsorption or activated carbon adsorption device and comprises a filtering and purifying device and a heat exchanger, the heat exchanger is used for removing micro particles in waste gas discharged from a workshop and then sending the micro particles into the heat exchanger, the energy carried by the heat exchanger is exchanged and then sent to the runner adsorption or molecular sieve adsorption or activated carbon adsorption device, the runner adsorption or molecular sieve adsorption or activated carbon adsorption device comprises an adsorption area and a regeneration desorption area, the adsorption area is used for carrying out adsorption treatment on a waste gas collection device, and the regeneration desorption area is used for carrying out desorption regeneration treatment on the adsorption area after adsorption saturation and realizing treatment or recycling of desorbed high-concentration organic gas components, the adsorption zone is connected with a circulating treatment device, a desorption regeneration zone is connected with a high-concentration desorption gas treatment device, the high-concentration desorption gas treatment device comprises a microwave heating device or an electric heating device, a circulating hot air fan and a catalytic combustion device or a condensation recovery device, and is used for treating and recovering high-concentration organic gas after desorption regeneration and desorption of an adsorption rotating wheel adsorption or a molecular sieve, the circulating treatment device is connected with an exhaust fan and is used for treating purified gas and then delivering the purified gas into a heat exchange device, and then the energy exchange with the exhaust gas is carried out to realize system circulation, and the purified gas is delivered back to a workshop.
Optionally, zeolite or other adsorption materials with a good adsorption effect on organic gas are coated on an adsorption carrier of the rotating wheel adsorption or molecular sieve adsorption or activated carbon adsorption device, and organic molecules in the waste gas collection device are adsorbed by the coated zeolite or other adsorption materials with a good adsorption effect on organic gas.
Optionally, regeneration desorption district inserts and has had microwave heating device or electric heater unit, circulating hot air fan catalytic combustion device or condensation recovery unit, microwave heating device or electric heater unit are used for heating gas, and then accomplish the adsorption bed that adsorbs the saturation and obtain desorption regeneration, catalytic combustion device is used for burning the organic molecule of desorption and changes carbon dioxide and steam into, condensation recovery unit is used for retrieving the high concentration organic gas composition that the desorption produced.
Optionally, the catalytic combustion device may also be a regenerative combustion device or an inner flame flare device.
Optionally, the device further comprises a catalytic combustion auxiliary device, wherein the catalytic combustion auxiliary device is connected with the catalytic combustion device and used for providing auxiliary fuel for the catalytic combustion device.
Optionally, the adsorption device further comprises an air or nitrogen generation device for heating and desorbing the adsorption region or the adsorption bed after the adsorption saturation.
Optionally, the adsorption device further comprises an electric heating device or a microwave heating device and a circulation heating fan, and the electric heating device or the microwave heating device is used for heating air or nitrogen, and further heating and desorbing the adsorption area or the adsorption bed after adsorption saturation.
Optionally, the heat exchange device is specifically configured to heat the gas extracted by the exhaust fan, and send the heated gas to the air handling unit; or it is right the gas of air exhauster extraction cools down to send the gas after the cooling into air handling unit, air handling unit and workshop air supply system link to each other for carry out automatically regulated, make it satisfy indoor requirement to the temperature.
Optionally, the heat exchange device is specifically configured to send the gas purified by the connected filtering and purifying device to a rotating wheel adsorption device, a molecular sieve adsorption device, or an activated carbon adsorption device after performing heat exchange treatment to recover energy.
Optionally, when the adsorption device adopts a molecular sieve adsorption or activated carbon adsorption device, a double-bed or multi-bed system is designed and adopted according to the gas concentration and the production rule, the specific adsorption structure comprises a parallel adsorption structure, and when the requirement of the environmental area on the exhaust emission is greater than a preset standard value, a series adsorption structure is adopted.
Drawings
Fig. 1 is a structural block diagram of a "zero emission architecture" of a rotary wheel adsorption process of an energy-saving emission-reduction waste gas treatment system in the printing industry and other industries that discharge VOCs waste gas according to an embodiment of the present invention;
fig. 2 is a structural block diagram of a "zero emission framework" of a molecular sieve or activated carbon adsorption process of an energy-saving emission-reduction waste gas treatment system in the printing industry and other industries that discharge VOCs waste gas according to an embodiment of the present invention;
fig. 3 is a structural block diagram of a "zero emission framework" of adsorption in parallel by molecular sieves or activated carbon adsorption processes of an energy-saving and emission-reduction waste gas treatment system in the printing industry and other industries that discharge VOCs waste gas according to an embodiment of the present invention;
fig. 4 is a structural block diagram of a "zero emission framework" of adsorption in series by a molecular sieve or activated carbon adsorption process of an energy-saving emission-reduction waste gas treatment system in the printing industry and other industries that discharge VOCs waste gas according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention. It should be further noted that, for convenience of description, only some structures, not all structures, relating to the embodiments of the present invention are shown in the drawings.
The present solution will now be described in detail with reference to the system.
Fig. 1 is a block diagram of a "zero emission architecture" of a rotary wheel adsorption process of an energy-saving emission-reduction exhaust gas treatment system in the printing industry and other industries that discharge VOCs exhaust gas, as shown in fig. 1, the energy-saving emission-reduction exhaust gas treatment system includes a rotary wheel adsorption device 101, an exhaust fan 102, a heat exchange device 103, a workshop air supply system 104, an exhaust gas collection device 1050 and a filtration and purification device 1051, wherein the exhaust gas collection device 1050 is connected to the filtration and purification device 1051 for purification, and then is connected to the rotary wheel adsorption device 101 through the connected heat exchange device 103, the rotary wheel adsorption device 101 includes an adsorption region 1011 and a regeneration and desorption region 1012, the adsorption region 1011 is used for adsorption treatment of the exhaust gas collection device, the regeneration and desorption region 1012 is used for desorption and regeneration treatment of the adsorption region after adsorption saturation, and for treatment or recycling of high-concentration organic gas for realizing desorption and regeneration, the exhaust fan 102 is connected with the circulation processing device 112, the circulation processing device 112 is connected with the rotary wheel adsorption device 101 and used for extracting gas processed by the circulation processing device 112 and sending the gas into the heat exchange device 103, the heat exchange device 103 is connected with the air processing unit 111, the air processing unit 111 is connected with the workshop air supply system 104 and used for performing heat exchange on the gas extracted by the exhaust fan 102 and then processing the gas and sending the gas into the workshop air supply system 104, and the workshop air supply system 104 is used for conveying the gas back to a workshop. Regeneration desorption district 1012 one end is passed through circulation heating fan 108 and is inserted microwave heating device or electric heater unit 106, regeneration desorption district 1012 other end inserts catalytic combustion device 1071 or condensation recovery unit 1072, wherein, the selective catalytic combustion device 1071 that uses or the condensation recovery unit 1072 to different processing demands, also perhaps both can use simultaneously under the special circumstances, microwave heating device or electric heater unit 106 are used for heating gas, and then accomplish the adsorption bed that adsorbs the saturation and obtain desorption regeneration, catalytic combustion device 1071 is used for burning the organic molecule that blows off, make it discharge after changing into carbon dioxide and steam, condensation recovery unit 1072 is used for retrieving the high concentration organic gas composition that the desorption produced.
The adsorption carrier of the rotating wheel adsorption device is coated with zeolite (or other adsorption materials with good adsorption effect on organic gas), and organic molecules in the waste gas collection device are adsorbed through the coated zeolite (or other adsorption materials with good adsorption effect on organic gas).
In one embodiment, the catalytic combustion device 1071 may be a regenerative combustion device or an internal flame torch device, wherein the microwave heating device or the electric heating device 106 is connected to a circulation heating fan 108, and the circulation heating fan 108 blows off the regenerated desorption region 1012 to obtain organic molecules and sends the organic molecules to the catalytic combustion device 107 for combustion.
In one embodiment, the energy-saving and emission-reducing waste gas treatment system for printing industry and other industries discharging VOCs waste gas further comprises a nitrogen generation device 109, wherein the nitrogen generation device 109 is connected with the cyclic heating fan 108 and used for performing safe desorption and regeneration on the adsorption bed for adsorption saturation, and certainly, the adsorption bed is also heated, desorbed and regenerated by using cheap air. When the hot nitrogen regeneration process is adopted, gas distribution is required in the combustion process so as to ensure the safe and stable operation of the catalytic combustion device while the safe operation is ensured.
In one embodiment, the energy-saving emission-reducing waste gas treatment system for printing industry and other industries discharging VOCs waste gas further comprises a catalytic combustion auxiliary device, wherein the catalytic combustion auxiliary device is connected with the catalytic combustion device and used for providing auxiliary fuel for the catalytic combustion device, and when the VOCs waste gas has low organic gas components and the concentration of the organic gas generated after being blown off by hot air is not high enough to be combusted in a self-sustaining manner, the auxiliary fuel (oil, gas and electricity) needs to be supplemented for combustion.
In one embodiment, for the waste gas which is lower than the ambient temperature and contains certain energy (cold energy) in summer (the production system is accompanied with an air conditioning process), the energy recycling process adopts a heat exchange device for regenerative heat exchange, so that the circulated gas and the gas which is extracted and needs to be purified are subjected to heat exchange, and the waste of energy discharge is reduced to the maximum extent. And meanwhile, corresponding water chilling units or/and air conditioning units or/and heat pump air conditioning units are configured to supplement energy (reduce temperature) for the recycled gas, so that the recycled gas meets the temperature requirement of the recycled gas and then is connected to an air treatment unit. Traditional printing industry VOCs exhaust treatment device handles after collecting the VOCs waste gas that the screen printing workshop produced, discharges after handling up to standard. In this scheme, can handle to high concentration VOCs waste gas, then select direct freezing recovery and exhaust gas circulation processing technology, specifically do:
low-temperature (about 26 ℃) high-concentration VOCs waste gas generated in an air conditioner production workshop is subjected to heat exchange with treated circulated high-temperature gas through a heat exchange device (a recooling device) to recover energy (cold quantity) in air conditioner cold air discharged from the workshop, and when the temperature of the air conditioner in the workshop cannot be reached, the temperature of the circulated return air is adjusted to about 26 ℃ through a cold quantity exchanger, so that waste of the cold quantity is reduced to the maximum extent;
VOCs waste gas after cold recovery directly enters a refrigeration recovery device, organic components are refrigerated and liquefied according to the characteristics of different VOCs waste gas, the organic components are converted into liquid from gas, the liquid waste gas enters a liquid storage tank and then returns to a production workshop for use, or the liquid waste gas is sold to a professional recovery company as heterocyclic organic gas components, so that the production cost is reduced;
a small amount of non-condensable gas (or non-condensable gas) exists in the waste gas after the organic gas components are recovered, the waste gas enters a waste gas circulating treatment device for further purification, a biological purification system or an ultraviolet light catalytic purification system or other purification processes can be selected as the process of the waste gas circulating treatment device, the gas after further purification returns to a production workshop through returning cold air, and the circulation is repeated.
In one embodiment, a cyclic treatment process is selected for low concentrations of non-recoverable VOCs off-gas. The method specifically comprises the following steps:
low-temperature (about 26 ℃) low-concentration VOCs waste gas generated in an air conditioner production workshop is subjected to heat exchange with treated circulated high-temperature gas through a heat exchange device (a recooling device) to recover energy (cold quantity) in air conditioner cold air discharged from the workshop, and when the temperature of the air conditioner in the workshop cannot be reached, the temperature of the circulated return air is adjusted to about 26 ℃ through a cold quantity exchanger, so that waste of the cold quantity is reduced to the maximum extent;
the VOCs waste gas with low concentration and without recovery value after cold recovery directly enters a waste gas circulation treatment device for further purification, the waste gas circulation treatment device can select a biological purification system or an ultraviolet light catalytic purification system or other purification processes, the gas after further purification returns to a production workshop through returning cold air, and the circulation is repeated.
The cold energy exchanger provides cold energy, can select the cooling water set, and the cooling water set provides required cold energy for the cold energy exchanger through freezing the storage water tank, and the cooling water set carries out the heat exchange through the cooling tower, realizes normal stable operation.
In one embodiment, for the waste gas of VOCs with a certain recovery value in medium and low concentration, a process of absorbing, regenerating, freezing, recovering and recycling the waste gas of VOCs is selected, and the process specifically comprises the following steps:
low-temperature (about 26 ℃) low-concentration VOCs waste gas generated in an air conditioner production workshop is subjected to heat exchange with treated circulated high-temperature gas through a heat exchange device (a recooling device) to recover energy (cold quantity) in air conditioner cold air discharged from the workshop, and when the temperature of the air conditioner in the workshop cannot be reached, the temperature of the circulated return air is adjusted to about 26 ℃ through a cold quantity exchanger, so that waste of the cold quantity is reduced to the maximum extent;
VOCs waste gas after cold recovery directly enters an adsorption concentration device, when a first group of adsorption tanks of the adsorption concentration device are saturated in adsorption, the waste gas enters a second group of adsorption tanks, the first group of adsorption tanks begin to be heated and regenerated, hot air heats and blows off organic gas components in the adsorption tanks saturated in adsorption, the organic gas components enter a refrigeration recovery device, in the refrigeration recovery device, the organic components are refrigerated and liquefied according to the characteristics of different VOCs waste gas, the gas state is converted into a liquid state, the liquid waste gas enters a liquid storage tank and then returns to a production workshop for use, or the liquid waste gas components are sold to a professional recovery company as heterocyclic organic gas components, and the production cost is reduced;
and a small amount of organic gas components are contained in the gas adsorbed by the adsorption tank, and then the gas enters a waste gas circulation treatment device for further purification, wherein the process of the waste gas circulation treatment device can select a biological purification system, also can select an ultraviolet light catalytic purification system or other purification processes, and the gas after further purification returns to a production workshop through returning cold air and is circulated and reciprocated.
In an embodiment, fig. 2 is a block diagram of a "zero emission framework" of a molecular sieve or activated carbon adsorption process of an energy-saving emission-reduction waste gas treatment system in the printing industry and other industries that discharge VOCs waste gas according to an embodiment of the present invention; as shown in fig. 3, when the adsorption zone 1011 uses activated carbon for adsorption, a multi-bed structure is adopted, wherein at least two adsorption devices (adsorption device a and adsorption device B) and the circulation heating fan 108 are included, and the adsorption, regeneration and standby states are switched at regular time according to the technical parameters of the adsorption process and the change characteristics of the gas concentration, so as to ensure the stability of the system operation.
In an embodiment, fig. 3 is a structural block diagram of a "zero emission architecture" of a molecular sieve or activated carbon adsorption process of an energy-saving and emission-reduction exhaust gas treatment system in the printing industry and other industries that emit VOCs exhaust gas according to an embodiment of the present invention, where in this embodiment, as shown in fig. 3, a specific adsorption structure includes a parallel adsorption structure, a molecular sieve adsorption device a (1011), a molecular sieve adsorption device B (1012), a molecular sieve adsorption device C (1013), and a molecular sieve adsorption device D (1014) are arranged in parallel, and when an environmental area has a low requirement for exhaust gas emission, the middle structure mode is used, so that a system can operate quickly and efficiently.
In an embodiment, fig. 4 is a structural block diagram of a "zero emission architecture" of a molecular sieve or activated carbon adsorption process of an energy-saving emission-reduction exhaust gas treatment system in the printing industry and other industries that emit VOCs exhaust gas, according to an embodiment of the present invention, as shown in fig. 4, a specific adsorption structure includes a serial adsorption structure, a molecular sieve adsorption device a (1011), a molecular sieve adsorption device B (1012), a molecular sieve adsorption device C (1013), and a molecular sieve adsorption device D (1014) are arranged in series, and when an environmental area has a high requirement on exhaust gas emission, the middle structure mode is used, so that efficient and effective exhaust gas treatment can be achieved. Specifically, the standard value may be adopted when the requirement of the environmental area on the exhaust emission is greater than a preset standard value, and the preset standard value may be set according to industry rules, production rules, legal regulations and the like.
In one embodiment, the "zero emission architecture" of the energy saving and emission reduction exhaust gas treatment system for the printing industry and other industries that emit VOCs exhaust gas further comprises: and the detection control unit is used for detecting and controlling the components and the concentration of the gas to be detected, and the gas to be detected comprises the waste gas in the closed-loop circulating device.
In one embodiment, the "zero emission architecture" of the energy saving and emission reduction exhaust gas treatment system for the printing industry and other industries that emit VOCs exhaust gas further comprises: the system control unit comprises at least one of a field control device, a remote control device, an application App or a cloud platform device. The system control unit is used for controlling the whole printing industry and other industries for discharging VOCs waste gas, energy-saving and emission-reduction waste gas treatment systems, and all units and nodes.
The zero emission framework of the energy-saving emission-reduction waste gas treatment system for the printing industry and other industries for discharging VOCs waste gas comprises a closed circulation structure formed by the whole air displacement type system (an air displacement type production device and an air displacement type production space), an energy treatment and recycling system contained in the waste gas and a waste gas circulation treatment system. The closed cycle structure formed by the air replacement system comprises an inlet and outlet pipeline, an air inlet, an air outlet and an emergency safe discharge (pressure relief) valve which are connected between an inlet and an outlet of the production system equipment; the energy processing and recycling system is provided with an energy (heat or cold) processing, recycling and utilizing device, can effectively process the energy without recycling value, and can recycle and utilize the energy discharged to the environment along with the waste gas; the waste gas circulating treatment system carries out ultimate purification on waste gas which pollutes the environment by adopting a recycling and purifying technology with optimized configuration, so as to meet the quality requirement of the recycled gas; the purified gas meeting the requirement of the circulating gas is sent back to the initial end of the whole system again, so that the final aim of zero emission of waste gas is realized.
The scheme realizes the following three major elements:
and (3) circulating treatment: the gas must be circularly treated, and can not be exchanged with the external gas phase environment, and the waste gas comes from the system, is purified and then returns to the system, and the process is repeated in cycles and is circularly reciprocated. Without circular processing, a 'zero emission architecture' cannot be realized;
limiting purification: the optimization of the gas purification technology and system configuration is required, and the most accurate process route and system collocation are selected aiming at different objects, so that the treatment effect is optimal, the operation cost is reasonable, and the cost performance is highest. The basic requirement of zero emission architecture cannot be met if the limit purification cannot be achieved;
gas balance: the total volume of the gas in the whole treatment process is not increased or reduced, the redundant gas is removed by adopting a corresponding technology, the consumed gas is supplemented by adopting a corresponding technology, what is lacked, what is supplemented, what is generated and what is eliminated. The gas balance cannot be realized, and finally, a zero emission framework cannot be really achieved.
The invention relates to an energy-saving emission-reducing and waste gas treatment 'zero-emission framework', which creatively provides a brand-new air displacement type system zero-emission treatment framework for discharging a large amount of waste gas pollutants and energy. The environmental benefit, the social benefit and the economic benefit complement each other.
It should be noted that, in the embodiment of the energy-saving emission-reduction exhaust gas treatment system in the printing industry and other industries that discharge VOCs exhaust gas, the units and modules included in the embodiment are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the embodiment of the invention.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, adaptations, and substitutions are possible, without departing from the scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention have been described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and many other equivalent embodiments may be included without departing from the concept of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.
Claims (10)
1. Printing industry and other trades energy saving and emission reduction exhaust treatment system that discharge VOCs waste gas, its characterized in that, the system includes: the device comprises a VOCs waste gas pretreatment device, a runner adsorption or molecular sieve adsorption or activated carbon adsorption device, a desorption regeneration and high-concentration desorption gas treatment device and a circulation treatment device, wherein the VOCs waste gas pretreatment device is connected with the runner adsorption or molecular sieve adsorption or activated carbon adsorption device and comprises a filtering and purifying device and a heat exchanger, the heat exchanger is used for removing micro particles in waste gas discharged from a workshop and then sending the micro particles into the heat exchanger, the energy carried by the heat exchanger is exchanged and then sent to the runner adsorption or molecular sieve adsorption or activated carbon adsorption device, the runner adsorption or molecular sieve adsorption or activated carbon adsorption device comprises an adsorption area and a regeneration desorption area, the adsorption area is used for carrying out adsorption treatment on a waste gas collection device, and the regeneration desorption area is used for carrying out desorption regeneration treatment on the adsorption area after adsorption saturation and realizing treatment or recycling of desorbed high-concentration organic gas components, the adsorption zone is connected with a circulating treatment device, a desorption regeneration zone is connected with a high-concentration desorption gas treatment device, the high-concentration desorption gas treatment device comprises a microwave heating device or an electric heating device, a circulating hot air fan and a catalytic combustion device or a condensation recovery device, and is used for treating and recovering high-concentration organic gas after desorption regeneration and desorption of an adsorption rotating wheel adsorption or a molecular sieve, the circulating treatment device is connected with an exhaust fan and is used for treating purified gas and then delivering the purified gas into a heat exchange device, and then the energy exchange with the exhaust gas is carried out to realize system circulation, and the purified gas is delivered back to a workshop.
2. The energy-saving emission-reducing exhaust gas treatment system for printing industry and other industries discharging Volatile Organic Compounds (VOCs) exhaust gas as claimed in claim 1, wherein the adsorption carrier of the rotating wheel adsorption or molecular sieve adsorption or activated carbon adsorption device is coated with zeolite or other adsorption material with good adsorption effect on organic gas, and organic molecules in the exhaust gas collection device are adsorbed by the coated zeolite or other adsorption material with good adsorption effect on organic gas.
3. The energy-saving emission-reducing waste gas treatment system for the printing industry and other industries discharging VOCs waste gas according to claim 1, wherein a microwave heating device or an electric heating device, a circulating hot air fan catalytic combustion device or a condensation recovery device are connected to the regeneration desorption region, the microwave heating device or the electric heating device is used for heating gas, so that desorption and regeneration of the adsorption bed saturated in adsorption are completed, the catalytic combustion device is used for burning desorbed organic molecules to convert the desorbed organic molecules into carbon dioxide and water vapor, and the condensation recovery device is used for recovering high-concentration organic gas components generated by desorption.
4. The energy saving and emission reduction exhaust gas treatment system for printing industry and other industries discharging VOCs exhaust gas of claim 3, wherein the catalytic combustion device can also be a regenerative combustion device or an inner flame flare device.
5. The energy saving and emission reduction exhaust treatment system for the printing industry and other industries that emit VOCs exhaust according to claim 3, further comprising a catalytic combustion auxiliary device, wherein said catalytic combustion auxiliary device is connected with said catalytic combustion device for providing auxiliary fuel for said catalytic combustion device.
6. The energy-saving emission-reducing exhaust gas treatment system for printing industry and other industries discharging VOCs exhaust gas according to claim 3, further comprising an air or nitrogen generating device for heating and desorbing the adsorption region or the adsorption bed after the adsorption saturation.
7. The energy-saving emission-reducing waste gas treatment system for the printing industry and other industries discharging VOCs waste gas according to claim 3, further comprising an electric heating or microwave heating device and a circulation heating fan, wherein the electric heating or microwave heating device and the circulation heating fan are used for heating air or nitrogen, and further heating and desorbing the adsorption area or the adsorption bed after adsorption saturation.
8. The energy-saving and emission-reducing waste gas treatment system for the printing industry and other industries that discharge VOCs waste gas according to claim 1, wherein the heat exchange device is specifically used for heating the gas extracted by the exhaust fan and sending the heated gas to an air handling unit; or it is right the gas of air exhauster extraction cools down to send the gas after the cooling into air handling unit, air handling unit and workshop air supply system link to each other for carry out automatically regulated, make it satisfy indoor requirement to the temperature.
9. The energy-saving and emission-reducing waste gas treatment system for the printing industry and other industries discharging VOCs waste gas according to claim 1, wherein the heat exchange device is specifically used for carrying out heat exchange treatment on the gas purified by the connected filtering and purifying device to recover energy, and then sending the gas into a rotating wheel adsorption device, a molecular sieve adsorption device or an active carbon adsorption device.
10. The system according to any one of claims 1 to 8, wherein when the adsorption device is a molecular sieve adsorption or activated carbon adsorption device, a double-bed or multi-bed system is designed according to the gas concentration and production rule, and the specific adsorption structure comprises a parallel adsorption structure, and when the requirement of the environmental area on the exhaust emission is greater than a preset standard value, a series adsorption structure is adopted.
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