CN111790244A - Organic gas treatment system and method - Google Patents
Organic gas treatment system and method Download PDFInfo
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- CN111790244A CN111790244A CN202010518822.4A CN202010518822A CN111790244A CN 111790244 A CN111790244 A CN 111790244A CN 202010518822 A CN202010518822 A CN 202010518822A CN 111790244 A CN111790244 A CN 111790244A
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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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- 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
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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
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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Abstract
The embodiment of the invention relates to a system and a method for processing organic gas, comprising the following steps: the device comprises a control system, a pretreatment unit, a main body working unit and an exhaust unit, wherein the pretreatment unit, the main body working unit and the exhaust unit are connected with the control system; the pretreatment unit is used for cooling, dehumidifying and dedusting the received organic gas; the pretreatment unit is connected with the main body working unit and used for introducing the organic gas subjected to cooling, dehumidifying and dedusting into the main body working unit for purification, and the main body working unit is connected with the exhaust unit and used for discharging the purified organic gas. Therefore, the detection, monitoring, control and recording of each main device of the pure dry processing system and the pure dry processing method applicable to the organic gas with dust, low concentration, large air volume and temperature and humidity can be realized through personnel control or autonomous work. The applicability range and the working efficiency of the device are improved, and the production requirements of different treatment capacities of the organic gas innocent treatment can be met through parameter design and intelligent control.
Description
Technical Field
The embodiment of the invention relates to the field of organic gas treatment, in particular to a system and a method for treating organic gas.
Background
In the storage, ventilation and processing processes of industries such as oil refining, petrochemical industry, automobile manufacturing and coating, automobile maintenance, electronic product manufacturing, shoe manufacturing, artificial board manufacturing, wood furniture, printing and the like, medium and high temperature organic gases with low concentration, large air volume and high humidity (up to 80%) are discharged to the outside, various Volatile Organic Compounds (VOCs) with complex components, such as sugar, nicotine, benzene series, alcohols, ketones, alkanes, acids, lipids and the like, contained in the gases can be emitted into the atmosphere along with exhaust gas to pollute the environment, and the organic gases are discharged after reaching the standard according to the emission standard of malodorous pollutants.
At present, low-efficiency technologies such as low-temperature plasma, photocatalysis, photo-oxidation and the like are applied even to more than 80%, the pollution treatment effect is poor, and the existing VOCs pollution treatment facilities have the problems of simplicity and low efficiency. For example, organic gas is treated by a dust remover, low-temperature plasma and cross-type chemical pool-washing peculiar smell treatment equipment, but the wet treatment device has large investment and the annual operation and maintenance cost, spare part cost, water cost and electricity cost reach more than 160 ten thousand yuan; high-concentration wastewater is discharged by alkaline washing, so that the treatment load and cost of the sewage treatment station are increased; the alkali washing treatment increases the moisture content in the waste gas, the investment of dehumidification and demisting equipment needs to be increased, the water consumption of the white removal equipment is about 4000 tons/month, the equipment effect is greatly influenced by seasons, the occupied area is large, the weight is large, and the layout and the safety of the house structure are influenced. In view of the complex components of the waste gas containing VOCs, various treatment technologies and great difference in applicability, the requirements of innovation technology selection and system matching need to be further improved in order to reach the latest emission standard, and a pure dry treatment system and a pure dry treatment method suitable for organic gas with dust content, low concentration, large air volume and temperature and humidity are urgently needed from the requirements of resource utilization, reduction and harmlessness of organic gas treatment.
The invention discloses a paint spraying air treatment system and a paint spraying air treatment method, which comprises a paint spraying chamber, an air inlet treatment device and an air exhaust treatment device, wherein air exhausted from the paint spraying chamber is separated into clean air and high-concentration VOCs mixed gas after being treated by an oil and paint mist removing device, a first rotating wheel dehumidifying device, a first air cooler and a VOCs rotating wheel, and the clean air is returned to the air inlet treatment device from an outlet of the VOCs rotating wheel through a return channel. The patent application number 201910855377.8 discloses an organic waste gas treatment process combining runner concentration and thermal storage oxidation, high-temperature gas cooled after heat exchange is discharged from an exhaust funnel, one strand of purified gas heated after heat exchange is merged with the other strand of purified gas discharged by a regulating valve connected to a shunt pipeline and enters zeolite concentration runner concentration equipment for treatment to form desorption gas, an RTO (regenerative thermal oxidizer) fan pumps the desorption gas to a valve group and sends the desorption gas to the thermal storage oxidation equipment through the valve group for oxidation treatment, the gas after oxidation treatment is switched through the valve group, is partially returned and partially discharged or is completely returned to an air inlet end of an air inlet fan, and is mixed with organic waste gas and then enters the zeolite concentration runner concentration equipment for purification treatment. Patent application No. 201910003508.X, this invention discloses a chemical exhaust gas treatment device of laboratory fume chamber direct vent, includes: a housing; a centrifugal fan mounted in the housing; the TVOC organic gas processing module is arranged on the right side of the centrifugal fan; install the antivirus filter module that disinfects on TVOC organic gas processing module right side, the air outlet play of antivirus filter module that disinfects is provided with inside circuitous wind channel. The patent application No. 201510320005.7 discloses a device and a method for treating organic waste gas, which comprises a dust remover, a condensation tube, activated carbon adsorption-microwave ultraviolet catalytic oxidation equipment, an air heater, a humidifier, a heat recovery device, a cooling and drying fan, a regeneration fan and an exhaust fan. However, these patents do not consider the problems of dust content, low concentration, large air volume, comprehensive treatment of humid and hot organic gases and waste heat utilization.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, embodiments of the present application provide a system and a method for processing an organic gas.
In a first aspect, an embodiment of the present application provides an organic gas processing system, including: the device comprises a control system, a pretreatment unit, a main body working unit and an exhaust unit, wherein the pretreatment unit, the main body working unit and the exhaust unit are connected with the control system;
the pretreatment unit is used for cooling, dehumidifying and dedusting the received organic gas;
the pretreatment unit is connected with one end of the main body working unit and used for introducing organic gas subjected to cooling, dehumidifying and dedusting into the main body working unit, the zeolite concentration rotating wheel in the main body working unit purifies the organic gas, and the other end of the main body working unit is connected with the exhaust unit and used for discharging the organic gas purified by the zeolite concentration rotating wheel.
Optionally, the preprocessing unit includes: a dehumidification device, a heat exchange device and a dust removal device;
the one end of dehydrating unit is equipped with the pipeline for receive organic gas, dehydrating unit's the other end with heat exchange device connects for let in organic gas after the drying dehumidification cool down among the heat exchange device, heat exchange device with dust collector connects for the particulate matter among the organic gas after the cooling gets rid of.
Optionally, the heat exchange device comprises: the heat exchanger, the water pump and the cold water reservoir are connected in a circulating manner;
one end of the heat exchanger is connected with the dehumidifying device and used for cooling the dehumidified organic gas, and the other end of the heat exchanger is connected with the dust removing device and used for introducing the cooled organic gas into the dust removing device.
Optionally, the main body working unit includes: a zeolite concentration wheel and a thermal combustion system;
the one end of zeolite concentrated runner with dust collector connects for volatile organic compounds in the organic gas after to cooling dehumidification dust removal adsorbs the concentration, and the volatile organic compounds that the rethread clean desorption gas that adsorbs the concentration and obtain on to the runner desorbs, obtains the desorption gas of constituteing by high concentration volatile organic compounds, the other end of zeolite concentrated runner with thermal combustion system connects, is used for letting in the desorption gas who obtains thermal combustion system purifies.
Optionally, the zeolite concentration wheel comprises: a treatment zone, a desorption zone and a cooling zone;
the treatment area is connected with an outlet of the pretreatment unit and used for receiving the organic gas after temperature reduction, dust removal and dehumidification, and a zeolite molecular sieve in the treatment area is used for adsorbing and concentrating volatile organic compounds in the organic gas, wherein one part of the organic gas after adsorption and concentration is introduced into the exhaust unit for emission, and the other part of the organic gas after adsorption and concentration enters the cooling area as desorption gas;
when the treatment area is saturated, the zeolite concentration rotating wheel is driven by the motor to rotate, volatile organic compounds adsorbed and concentrated in the treatment area are transferred to the desorption area, the desorption area is used for desorbing the volatile organic compounds adsorbed and concentrated by adopting clean desorption gas to form desorption gas consisting of high-concentration volatile organic compounds, the desorption gas consisting of the high-concentration volatile organic compounds is introduced into a thermal combustion system through a pipeline for combustion, and after the desorption is completed, the desorption area which is driven by the motor to complete the desorption is introduced into the cooling area;
the cooling area is cooled by the desorption gas introduced into the treatment area, and the desorption gas introduced into the treatment area is heated for one time.
Optionally, the thermodynamic combustion system is further connected with an outlet of the cooling zone through a pipeline, and is used for performing secondary temperature rise on the desorption gas introduced from the treatment zone, and introducing the desorption gas introduced from the treatment zone into the desorption zone through a pipeline to obtain desorption gas composed of high-concentration volatile organic compounds, so that the main working unit is maintained to operate circularly by recovering heat energy.
Optionally, the retention time of the desorbed gas of the high-concentration volatile organic compound in the thermal combustion device is more than 2s, so as to improve the combustion treatment efficiency of the volatile organic compound in the high-concentration desorbed gas.
Optionally, the thermal combustion system comprises: low-nitrogen burner and heat exchange device.
Optionally, the exhaust unit includes a fan and an exhaust duct.
In another aspect, an embodiment of the present application provides a method for processing an organic gas, where a processing system for an organic gas according to any one of the above embodiments includes:
introducing low-concentration and dust-containing warm and humid organic gas into a pretreatment unit for cooling, dehumidifying and dedusting;
introducing the organic gas subjected to temperature reduction, dehumidification and dust removal into a main body working unit for purification;
discharging the purified organic gas;
wherein, purify in letting in the main part work unit with the organic gas after cooling dehumidification dust removal, include:
adopting a zeolite molecular sieve in a treatment area to adsorb and concentrate volatile organic compounds in the organic gas, introducing a part of the organic gas subjected to adsorption and concentration into an exhaust unit to be discharged, and introducing the other part of the organic gas subjected to adsorption and concentration into a cooling area to be used as desorption gas;
after the treatment area is saturated, desorbing the volatile organic compounds obtained by adsorption and concentration in the treatment area by using clean desorption gas in the desorption area to form desorption gas consisting of high-concentration volatile organic compounds, introducing the desorption gas consisting of the high-concentration volatile organic compounds into a thermal combustion system for combustion, and after the desorption is finished, transferring the desorption area in which the desorption is finished into a cooling area along with the rotation of a motor;
and the desorption zone in which desorption is finished is cooled by adopting desorption gas introduced from the treatment zone in the cooling zone.
The embodiment of the invention provides a pure dry processing system and a pure dry processing method which can realize detection, monitoring, control and recording of main devices of the system and the method and are suitable for organic gases with dust, low concentration, large air volume and temperature and humidity through personnel control or autonomous work. The intelligent pure dry treatment system is realized through the control system, the treatment of different dust contents, concentrations, air quantities and humiture of the organic gas can be met, the applicability range and the working efficiency of the equipment are improved, and the production requirements of harmless treatment of the organic gas with different treatment capacities can be realized through parameter design and intelligent control.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic view of an organic gas processing system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for processing an organic gas according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, technical methods in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components in a certain posture, the motion situation, etc., and if the certain posture is changed, the directional indications are changed accordingly.
Fig. 1 is a schematic view of an organic gas processing system according to an embodiment of the present invention, and as shown in fig. 1, an embodiment of the present invention provides an organic gas processing system including: a control system 4, and a pretreatment unit 1, a main body working unit 2 and an exhaust unit 3 connected to the control system 4;
the pretreatment unit 1 is used for cooling, dehumidifying and dedusting the received organic gas;
the pretreatment unit 1 is connected with the main body working unit 2 and used for introducing the organic gas subjected to temperature reduction, dehumidification and dust removal into the main body working unit 2 for purification, and the main body working unit 2 is connected with the exhaust unit 3 and used for discharging the purified organic gas through the exhaust unit.
As shown in fig. 1, the preprocessing unit in the present embodiment includes: a dehumidifier 11, a heat exchanger 12 and a dust remover 13;
it should be noted that the heat exchange device 12 can cool the organic gas to achieve the efficient operation temperature range of the concentration rotating wheel; the dehumidifying device 11 can dry the organic gas and reduce the humidity, so as to achieve the high-efficiency operation humidity range of the concentration rotating wheel; the dust removing device 13 is used for collecting and purifying particles in the organic gas, and can remove the particles in the organic gas to enable the particle size of the particles to be smaller than 1 micron. The connection sequence of the above three devices can be changed according to the characteristics of the organic gas to achieve an optimal state.
As an example, a pipeline is provided at one end of the dehumidifying device 11 for receiving the organic gas, the other end of the dehumidifying device 11 is connected to the heat exchanging device 12 for introducing the dried and dehumidified organic gas into the heat exchanging device 12 for cooling, and the heat exchanging device 12 is connected to the dust removing device 13 for removing the particulate matters in the cooled organic gas.
Specifically, the dehumidifying device may be a physical dehumidifying (cooling dehumidifying) device and a chemical dehumidifying device. The physical dehumidifying apparatus includes a cooling method apparatus and a compression cooling method apparatus. The chemical dehumidification device comprises a wet dehumidification device and a dry dehumidification device.
As shown in fig. 1, the heat exchange device 12 includes: a heat exchanger 121, a water pump 122, and a cold water reservoir 123 that are connected in a circulating manner; wherein, heat exchanger 121's one end still is connected with dehydrating unit for the organic gas after to the dehumidification cools down, and heat exchanger 121's the other end is connected with dust collector, is used for letting in dust collector with the organic gas after the cooling.
The heat exchanger in the embodiment adopts a heat exchanger for non-contact heat exchange, the cooling medium is water or air, and the temperature of the organic gas at 50-400 ℃ can be reduced to be within 50 ℃. Due to the adoption of non-contact water/air, the water/air is kept clean and can be recycled, so that the water consumption is greatly reduced, and meanwhile, the waste heat of the organic gas is recycled and supplied to a factory for use, so that the energy consumption is reduced, and the energy-saving and emission-reducing benefits are realized. The water pump provides power for circulating cooling water, the dry-type dehumidification device comprises a rotating wheel type device and a fixed type device, and the rotating wheel type device comprises a lithium chloride rotating wheel, a high-efficiency silica gel rotating wheel and a molecular sieve rotating wheel. The main energy consumption of the rotary wheel dehumidification device is to regenerate hot air required by the adsorption rotary wheel, and a heat source for heating the regenerated air can be organic gas in the heat exchange device, so that the dehumidification cost is low.
The dust removing device 13 in this embodiment may be a gravity settling type dust remover (such as a flue gas settling chamber), a mechanical type dust remover (such as an inertia separation type dust remover, a centrifugal type dust remover, etc.), an electric dust remover, an ultrasonic dust remover, a filter type dust remover (such as a bag type dust remover, etc.), a wet type scrubbing dust remover, a high gradient magnetic separator, a charged bag type filter, a charged droplet scrubber, etc. Filter precipitators are often employed at lower particulate concentrations, taking into account the characteristics of the organic gas.
As shown in fig. 1, the main body working unit 2 includes: a zeolite concentration wheel 21, a motor 22 and a thermal combustion system 23;
one end of the zeolite concentration rotating wheel 21 is connected with the dust removal device 13 and is used for adsorbing and concentrating volatile organic compounds in the organic gas after cooling, dehumidifying and dust removing, desorbing the volatile organic compounds obtained by adsorption and concentration on the rotating wheel through clean desorption gas to obtain desorption gas consisting of high-concentration volatile organic compounds, and the other end of the zeolite concentration rotating wheel 21 is connected with the thermal combustion system 23 and is used for introducing the desorption gas after adsorption and concentration into the thermal combustion system for purification. In addition, the motor 22 is used to control the rotation of the zeolite concentration wheel 21.
In this embodiment, the zeolite concentration wheel comprises: a treatment zone, a desorption zone and a cooling zone;
the treatment area is connected with an outlet of the pretreatment unit, volatile organic compounds in the organic gas are adsorbed and concentrated through porous adsorption of the zeolite molecular sieve, wherein one part of the organic gas subjected to adsorption and concentration is introduced into the exhaust unit to be discharged, and the other part of the organic gas subjected to adsorption and concentration enters the cooling area to be used as desorption gas;
when the treatment area is saturated, the zeolite concentration rotating wheel is driven by the motor to rotate, the volatile organic compounds adsorbed and concentrated in the treatment area are transferred to the desorption area,
it should be noted that the treatment area is provided with an organic gas inlet which is connected with an outlet of the pretreatment unit, VOCs in the organic gas in the area are adsorbed and concentrated by porous adsorption of the zeolite molecular sieve, the adsorption efficiency can reach 99%, the purified organic gas enters the cooling area through a part of the pipeline to become desorption gas, and the flow rate of the desorption gas is more than 1/6 of the flow rate of the organic gas; the other part is discharged through a chimney; when the adsorption zone of the rotating wheel is saturated, the zone drives the adsorbed volatile organic compounds to rotate along with the motor to enter the desorption zone, and the adjacent cooling zone rotates to the position connected with the outlet pipeline of the pretreatment unit to become a new treatment zone for continuously adsorbing the volatile organic gases. The pressure drop of the VOCs adsorption process of the zeolite concentration rotating wheel is extremely low, and the power consumption of the fan can be greatly reduced.
The desorption area is used for desorbing the volatile organic compounds which are adsorbed and concentrated by adopting clean desorption gas to form desorption gas consisting of high-concentration volatile organic compounds, the desorption gas consisting of the high-concentration volatile organic compounds is introduced into the thermal combustion system through a pipeline for combustion, and after the desorption is finished, the desorption area which is driven by the motor to finish the desorption is carried into the cooling area;
it is noted that the desorption gas at the temperature of 100-; after desorption in the desorption area is completed, the desorption area enters the cooling area along with the rotation driven by the motor, and the adjacent treatment area rotates to the position connected with the inlet pipeline of the thermal combustion system to form a new desorption area. The adsorption and desorption efficiency is improved, the original VOCs organic gas with low concentration and large air volume is converted into the desorption gas with high concentration and small air volume, the concentration multiple can reach 3-10 times, and the specification, fixed investment and operation cost of the rear end final treatment equipment are greatly reduced.
The cooling zone adopts desorption gas introduced from the treatment zone to cool the desorption zone and heat the desorption gas for one time.
In this embodiment, the purpose of the cooling zone is to cool the desorption zone for desorption so as to reach the optimum temperature range for the adsorption effect of the treatment zone. And part of purified gas which is discharged from the treatment zone and is less than 50 ℃ enters a cooling zone, and the first-stage temperature rise in the desorption gas gradient temperature rise is completed while the desorption zone which finishes desorption is cooled.
It should be noted that when the cooling zone is cooled, the zone is driven by the motor to rotate and enter the treatment zone, and the adjacent desorption zone rotates to the position connected with the outlet pipeline of the treatment zone to become a new cooling zone, so that the zeolite concentration rotary wheel completes one cycle.
The thermal combustion device in this embodiment is used for high concentration desorption gas to burn in the stove, accomplishes whole purification process, and combustion efficiency can reach 95%, and the desorption gas after the purification passes through the pipeline and discharges via the chimney up to standard.
The low-nitrogen combustor thermal combustion system adopts the low-nitrogen combustor, can inhibit the generation of pollutants in the combustion process, and realizes the emission reduction benefit. The temperature range of 100 plus 300 ℃ desorption high-efficiency operation can be reached, the whole device maintains the system operation by recovering heat energy, and the energy-saving benefit is realized.
The thermal combustion system in this embodiment is further connected with the outlet of the cooling zone through a pipeline, and is used for carrying out secondary temperature rise on the desorption gas introduced from the treatment zone, and introducing the desorption gas introduced from the treatment zone into the desorption zone through a pipeline to obtain desorption gas consisting of high-concentration volatile organic compounds, so that the main working unit can be maintained to run circularly by recovering heat energy. In this embodiment, the retention time of the desorption gas of the high concentration volatile organic compounds in the thermal combustion device is 2s or more, and the present invention is used for improving the efficiency of the combustion treatment of the volatile organic compounds in the high concentration desorption gas.
In this embodiment, the thermodynamic combustion system comprises: low-nitrogen burner and heat exchange device.
In the present embodiment, the exhaust unit includes a blower and an exhaust duct. The fan provides flowing power for the gas in the pipe network; the chimney provides a ventilation structure for the purified organic gas. In consideration of integration, the purified organic gas at the outlet of the rotary wheel treatment area and the flue gas generated by the combustion device are combined into one part to be discharged, and as the organic gas is subjected to dehumidification treatment and the water vapor generated by combustion is little, the requirement of dehumidification and whitening on discharge does not exist basically, and the fixed investment of an exhaust unit is reduced.
The fan includes organic gas draught fan 31 and desorption gas draught fan 32. An organic gas draught fan 31 is arranged on a low-concentration and large-air-volume organic gas pipeline; the desorption gas draught fan 32 is arranged on the desorption gas pipeline.
In addition, the control system 1 in the embodiment is used for detecting, controlling, adjusting and early warning parameters such as organic gas composition, concentration, temperature, pressure and flow in the process flow, improves the reliability, intelligent level and security performance of the system, reduces the labor cost, can be controlled wirelessly and remotely, can also work autonomously or be operated manually, and realizes power supply through an energy system by the whole equipment; the system includes a pretreatment control system 41, a main body operation control system 42, and an exhaust gas control system 43.
The pretreatment control system 41 can detect, monitor, control, adjust and record the parameter data of the composition, concentration, temperature, pressure, flow and the like of the organic gas in the pretreatment process, and forms feedback with each link of the organic gas treatment system, thereby ensuring the safe and efficient operation of the pretreatment process of the system. The data are input into a control system, software completes related thermodynamic calculation, and the flow of a cold source of a heat exchange device of the preprocessing unit, the flow of desorption gas and the like are adjusted by controlling the power of a fan. The pretreatment control system 41 comprises a flue gas inlet online detection system for monitoring whether flue gas entering the main body equipment reaches the standard or not, so that equipment damage is avoided, the service life of the equipment is prolonged, the maintenance and shutdown time is reduced, and the labor cost is reduced.
The main body working control system 42 can detect, monitor, control, adjust and record the composition of the organic gas and the parameter data of concentration, temperature, pressure, flow and the like in the working process of the main body, and forms feedback with each link of the organic gas processing system, thereby ensuring the safe and efficient operation of the pretreatment process of the system. The power and the rotating speed of the motor and the power of the low-nitrogen combustor are adjustable and controllable.
The exhaust control system 43 can detect, monitor, control, adjust and record the parameter data of organic gas composition, concentration, temperature, pressure, flow and the like in the exhaust process, control the process trial operation and the standard emission, form feedback with each link of the organic gas treatment system, and ensure the safe and efficient operation of the pretreatment process of the system. The exhaust control system 43 includes a flue gas outlet on-line detection system for monitoring whether the purified gas meets the emission standard, and can detect the organic gas components and the concentrations, molecular weights, boiling points, etc. of the components, the odor concentration, the temperature, the humidity, etc.
The invention can reduce the dust content, temperature and humidity of the organic gas through the pretreatment unit, and achieve the optimal operation interval of the main working unit; the organic gas treatment efficiency of the main body working unit can reach 95 percent, and the emission of pollutants can be greatly reduced; the invention adopts a pure dry process means, the purified gas emission basically has no 'dehumidification and whitening' requirements, the water consumption is greatly reduced, and the 'dehumidification and whitening' fixed investment, the operation cost, the occupied area and the weight are reduced; the invention is provided with 2 heat exchange devices, which can meet the production requirement of high-efficiency waste heat recovery and utilization, improve the waste heat resource utilization efficiency of the system and reduce the power consumption and the operation cost greatly.
Fig. 2 is a flowchart of a method for processing an organic gas according to an embodiment of the present disclosure, as shown in fig. 2, the method includes:
step S11, introducing the low-concentration and dust-containing warm and humid organic gas into a pretreatment unit for cooling, dehumidifying and dedusting;
specifically, firstly, a dehumidifying device is adopted to dry and dehumidify the organic gas; secondly, cooling the dried and dehumidified organic gas by using a heat exchange device; and finally, removing the particulate matters in the cooled organic gas by using a dust removal device.
S12, introducing the organic gas subjected to temperature reduction, dehumidification and dust removal into a main body working unit for purification;
specifically, a zeolite molecular sieve in a treatment area is adopted to adsorb and concentrate volatile organic compounds in organic gas, one part of the organic gas subjected to adsorption and concentration is introduced into an exhaust unit to be discharged, and the other part of the organic gas subjected to adsorption and concentration enters a cooling area to be used as desorption gas;
after the treatment area is saturated, desorbing the volatile organic compounds obtained by adsorption and concentration in the treatment area by using clean desorption gas in the desorption area to form desorption gas consisting of high-concentration volatile organic compounds, introducing the desorption gas consisting of the high-concentration volatile organic compounds into a thermal combustion system for combustion, and after the desorption is finished, transferring the desorption area in which the desorption is finished into a cooling area along with the rotation of a motor;
and introducing desorption gas from the treatment area in the cooling area to cool the desorption area in which desorption is completed.
Thus, one working cycle of the zeolite concentration rotating wheel is completed, and the effect of purifying the organic gas after temperature reduction, dehumidification and dust removal is achieved.
And step S13, discharging the purified organic gas.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments described above as examples. It will be appreciated by those skilled in the art that various equivalent changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended to cover all such modifications and alterations as fall within the true spirit and scope of the invention.
Claims (10)
1. A system for processing an organic gas, comprising: the device comprises a control system, a pretreatment unit, a main body working unit and an exhaust unit, wherein the pretreatment unit, the main body working unit and the exhaust unit are connected with the control system;
the pretreatment unit is used for cooling, dehumidifying and dedusting the received organic gas;
the pretreatment unit is connected with one end of the main body working unit and used for introducing organic gas subjected to cooling, dehumidifying and dedusting into the main body working unit, the zeolite concentration rotating wheel in the main body working unit purifies the organic gas, and the other end of the main body working unit is connected with the exhaust unit and used for discharging the organic gas purified by the zeolite concentration rotating wheel.
2. The system of claim 1, wherein the preprocessing unit comprises: a dehumidification device, a heat exchange device and a dust removal device;
the one end of dehydrating unit is equipped with the pipeline for receive organic gas, dehydrating unit's the other end with heat exchange device connects for let in organic gas after the drying dehumidification cool down among the heat exchange device, heat exchange device with dust collector connects for the particulate matter among the organic gas after the cooling gets rid of.
3. The system of claim 2, wherein the heat exchange device comprises: the heat exchanger, the water pump and the cold water reservoir are connected in a circulating manner;
one end of the heat exchanger is connected with the dehumidifying device and used for cooling the dehumidified organic gas, and the other end of the heat exchanger is connected with the dust removing device and used for introducing the cooled organic gas into the dust removing device.
4. The system of claim 2, wherein the main body work unit comprises: a zeolite concentration wheel and a thermal combustion system;
the one end of zeolite concentrated runner with dust collector connects for volatile organic compounds in the organic gas after to cooling dehumidification dust removal adsorbs the concentration, and the volatile organic compounds that the rethread clean desorption gas that adsorbs the concentration and obtain on to the runner desorbs, obtains the desorption gas of constituteing by high concentration volatile organic compounds, the other end of zeolite concentrated runner with thermal combustion system connects, is used for letting in the desorption gas who obtains thermal combustion system purifies.
5. The system of claim 4, wherein the zeolite concentration wheel comprises therein: a treatment zone, a desorption zone and a cooling zone;
the treatment area is connected with an outlet of the pretreatment unit and used for receiving the organic gas after temperature reduction, dust removal and dehumidification, and a zeolite molecular sieve in the treatment area is used for adsorbing and concentrating volatile organic compounds in the organic gas, wherein one part of the organic gas after adsorption and concentration is introduced into the exhaust unit for emission, and the other part of the organic gas after adsorption and concentration enters the cooling area as desorption gas;
when the treatment area is saturated, the zeolite concentration rotating wheel is driven by the motor to rotate, volatile organic compounds adsorbed and concentrated in the treatment area are transferred to the desorption area, the desorption area is used for desorbing the volatile organic compounds adsorbed and concentrated by adopting clean desorption gas to form desorption gas consisting of high-concentration volatile organic compounds, the desorption gas consisting of the high-concentration volatile organic compounds is introduced into a thermal combustion system through a pipeline for combustion, and after the desorption is completed, the desorption area which is driven by the motor to complete the desorption is introduced into the cooling area;
the cooling area adopts the desorption gas introduced from the processing area to cool the desorption area, and the desorption gas introduced from the processing area is heated for one time.
6. The system of claim 5, wherein the thermal combustion system is further connected with the outlet of the cooling zone through a pipeline, and is used for carrying out secondary temperature rise on the desorption gas introduced from the treatment zone, and introducing the desorption gas introduced from the treatment zone into the desorption zone through a pipeline to obtain desorption gas consisting of high-concentration volatile organic compounds, so as to recover heat energy to maintain the cyclic operation of the main working unit.
7. The system of claim 5, wherein the retention time of the desorption gas of high concentration of volatile organic compounds in the thermal combustion device is more than 2s, so as to improve the efficiency of combustion treatment of volatile organic compounds in the desorption gas of high concentration.
8. The system of claim 5, wherein the thermal combustion system comprises: low-nitrogen burner and heat exchange device.
9. The system of claim 1, wherein the exhaust unit comprises a fan and an exhaust duct.
10. A method for treating an organic gas, using the system for treating an organic gas according to any one of claims 1 to 9, comprising:
introducing low-concentration and dust-containing warm and humid organic gas into a pretreatment unit for cooling, dehumidifying and dedusting;
introducing the organic gas subjected to temperature reduction, dehumidification and dust removal into a main body working unit for purification;
discharging the purified organic gas;
wherein, purify in letting in the main part work unit with the organic gas after cooling dehumidification dust removal, include:
adopting a zeolite molecular sieve in a treatment area to adsorb and concentrate volatile organic compounds in the organic gas, introducing a part of the organic gas subjected to adsorption and concentration into an exhaust unit to be discharged, and introducing the other part of the organic gas subjected to adsorption and concentration into a cooling area to be used as desorption gas;
after the treatment area is saturated, desorbing the volatile organic compounds obtained by adsorption and concentration in the treatment area by using clean desorption gas in the desorption area to form desorption gas consisting of high-concentration volatile organic compounds, introducing the desorption gas consisting of the high-concentration volatile organic compounds into a thermal combustion system for combustion, and after the desorption is finished, transferring the desorption area in which the desorption is finished into a cooling area along with the rotation of a motor;
and the desorption zone in which desorption is finished is cooled by adopting desorption gas introduced from the treatment zone in the cooling zone.
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