WO2018137692A1 - Method and system for recovering vocs from industrial waste gas - Google Patents
Method and system for recovering vocs from industrial waste gas Download PDFInfo
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- WO2018137692A1 WO2018137692A1 PCT/CN2018/074212 CN2018074212W WO2018137692A1 WO 2018137692 A1 WO2018137692 A1 WO 2018137692A1 CN 2018074212 W CN2018074212 W CN 2018074212W WO 2018137692 A1 WO2018137692 A1 WO 2018137692A1
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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
- B01D53/10—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 with dispersed adsorbents
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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
- B01D53/10—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 with dispersed adsorbents
- B01D53/12—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 with dispersed adsorbents according to the "fluidised technique"
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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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
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
Definitions
- the invention belongs to the field of environmental protection technology, and relates to acetone, methanol, ethanol, benzene, toluene, xylene, butanol, butyl ester, etc. in the fields of coal chemical, oil refining, petrochemical, fine chemical, pharmaceutical, printing, coating, ink and the like. Purification and recycling of one or more organic tail gases. Specifically, an industrial waste gas VOC recovery method and a recovery system thereof.
- Volatile Organic Compounds are an important class of air pollutants with boiling points between 50 ° C and 260 ° C and saturated vapor pressures above 133.3 Pa at room temperature, which is one of the main factors leading to the formation of atmospheric photochemical smog.
- Common components are hydrocarbons, benzenes, alcohols, ketones, phenols, aldehydes, esters, amines, cyanides, etc., mainly from chemical and petrochemical production processes, exhaust gas, automobiles Exhaust gas, coal-fired exhaust gas, etc.
- VOC treatment methods There are two types of VOC treatment methods: one is destructive methods, such as incineration and catalytic combustion, converting VOC to CO 2 and H 2 O; the other is non-destructive, ie, recovery, common recovery.
- the methods include carbon adsorption, condensation and membrane separation, and most of the methods have certain defects.
- the main VOC recovery equipment is relatively large, with many components and complicated processes.
- the patent CN201320617072.1UV-VOC exhaust gas treatment device includes a photolysis and oxidation fission chamber, etc.
- a VOC decomposition composite purification treatment device and method includes an absorption tower, a circulating pool, a composite decomposition pool, etc.
- a VOC-containing The exhaust gas recovery and purification device includes a large fiber bed, a heat exchanger, a blower, and the like, and the CN201520015024.4 high-efficiency VOC purification device involves an absorption tower and the like.
- the present invention provides an industrial waste gas VOC recovery method and recovery system, and the specific scheme is as follows:
- An industrial waste gas VOC recovery method comprising:
- First-stage mixed fluidized absorption unit industrial discharge VOC-containing exhaust gas passes through a gas collecting device, is sent to a mixing fluidization device by a fan, and the activated carbon regenerated by the heating and blowing regeneration unit is injected into the mixing fluidization device, and the activated carbon is activated by the air flow.
- the exhaust gas and the activated carbon are in full contact, and the VOC in the industrial waste gas is adsorbed.
- Two-stage cyclone adsorption recovery unit fresh activated carbon particles are injected into the cyclone adsorption device, and the industrial waste gas adsorbed by the first-stage mixed fluidization absorption unit is tangentially entered into the cyclone adsorption device.
- the activated carbon particles continuously rotate in the rotating turbulent flow field similar to the fluidized bed, and the tangentially entering industrial waste gas is in full contact with the activated carbon particles, and the activated carbon particles adsorb the VOC in the exhaust gas and are discharged from the bottom of the cyclone adsorption device.
- the purified gas is discharged from the top of the cyclone adsorption unit.
- Heating and blowing regeneration unit The activated carbon which fully adsorbs VOC flows out from the bottom of the cyclone adsorption device, and enters the feeding machine to perform heat extraction and regeneration by using hot nitrogen.
- the regenerated activated carbon is returned to the mixing fluidization device for recycling, and the desorbed VOC gas and the hot nitrogen gas enter the catalytic condensation device.
- Catalytic condensing unit After catalytic condensation, the liquid phase organic matter flows out from the bottom of the device and is sent to the subsequent equipment. After the catalytic condensation, the gas phase is discharged from the top of the device.
- the industrial waste gas VOC is treated by a fluidized adsorption-swirl adsorption combined adsorption method, the mixed fluidized adsorption is a primary adsorption unit, and the cyclone adsorption is a secondary adsorption unit;
- the activated carbon particles of the secondary cyclone adsorption unit enter the cyclone adsorber, continuously rotate in the rotating turbulent flow field, increase the interface with the VOC gas, and improve the adsorption efficiency;
- the method described in the step (2) can effectively modify the activated carbon particles of the secondary cyclone adsorption unit, so that the activated carbon has a stronger adsorption function and better mechanical strength, and for different adsorption requirements, Using different types of activated carbon;
- the condensation temperature is adjusted according to different VOC components, and the VOC is condensed by using different catalytic cooling media, and the cooling medium is used to rapidly cool all VOCs by using different condensation points of the VOC;
- the method has a VOC removal rate of 98% or more according to VOC gas composition and requirements, and is applicable to all VOC working conditions without secondary pollution;
- the present invention provides an industrial waste gas VOC recovery system, the system comprising:
- An exhaust gas collection device for collecting industrial emissions containing VOC exhaust gas
- a fan connected to the exhaust gas collecting device for conveying VOC-containing industrial waste gas to the mixing fluidization device
- a mixed fluidized adsorption device connected to the fan for first-stage adsorption of VOC in industrial waste gas
- a cyclone adsorption device connected to the mixing fluidization device for secondary adsorption of VOC in industrial waste gas
- the feeder connected with the cyclone adsorption device heats the activated carbon by heating with hot nitrogen to desorb the VOC gas;
- a pump connected to the feeder to inject regenerative activated carbon into the mixed fluidized bed
- a catalytic condensing unit connected to the feeder for catalyzing the condensation of VOCs with hot nitrogen.
- the cyclone adsorption device can be serially or in parallel in a single or multiple stages.
- the mixing fluidization device is connected in series with the cyclone adsorption device, the mixed fluidization device performs first-order VOC gas adsorption, and the cyclone adsorption device performs secondary high-efficiency VOC gas adsorption.
- the mixing fluidization device and the cyclone adsorption device can adopt different diameters to process industrial waste gas with different air volumes.
- the device system connects the mixing fluidization device, the cyclone adsorption device, and the catalytic condensation device in series, has small pressure drop, low energy consumption, and reduces the total floor space and total investment of the device.
- Figure 1 is a schematic illustration of the recovery system of the present invention.
- the VOC exhaust gas discharged from the factory is collected by the exhaust gas collecting device 1 and sent to the mixed fluidized adsorption device 3 through the fan 2 for primary adsorption; after the primary adsorption, the exhaust gas is sent to the cyclone adsorption device 4, and fresh.
- the activated carbon is injected into the cyclone adsorption device 4 for secondary adsorption; after the two-stage adsorption purification, the gas is discharged from the top outlet of the cyclone adsorption device 4, and the adsorbed VOC activated carbon is fed into the feeder 5 from the bottom of the cyclone adsorption device 4, and the hot nitrogen enters the feed.
- the heating and desorption regeneration is carried out in the machine 5; after the regeneration, the activated carbon is sent to the mixed fluidized adsorption device 3 via the pump 6, and the hot nitrogen gas enters the catalytic condensation device 7 together with the VOC; the gas phase and the liquid phase are discharged after the degradation in the catalytic condensation device 7 To the pipe network.
- the industrial waste gas VOC is treated by fluidized adsorption-swirl adsorption combined adsorption method to effectively improve the adsorption efficiency; all VOCs are rapidly condensed by different condensation points, which can be used to separate all VOC gases;
- the series is connected in series or in parallel to effectively improve the effect of separating VOC; the method is applicable to all adsorption VOC conditions; the device system connects the mixing fluidization device, the cyclone adsorption device and the catalytic condensation device in series, the pressure drop is small, the energy consumption is low, and the device is reduced. Total floor area and total investment.
- a paintmaking plant in Shanghai has a 20,000 Nm 3 /h air volume exhaust gas with a VOC concentration of 500 mg/Nm 3 , which is carried out according to the method and apparatus of the present invention for 24 hours.
- the VOC emission after treatment by the above device is about 4mg/m 3 (using thermal desorption injection gas chromatograph), in line with the "Integrated Emission Standard of Air Pollutants" (GB16297-1996), the VOC recovery rate is 99.2%.
- toluene gas having a concentration of 700 mg/m 3 was introduced for 24 hours.
- the toluene discharge after treatment by the above device is about 10 mg/m 3 (using a thermal desorption injection gas chromatograph), which complies with the "Integrated Emission Standard for Air Pollutants" (GB16297-1996), and the recovery rate of toluene is 98.6%.
- Example 2 It is basically the same as Example 1, except that a concentration of 900 mg/m 3 of butyl acetate gas is passed for 24 hours; the discharge of butyl acetate after treatment by the above apparatus is about 10 mg/m 3 or less (determined by gas chromatography). Test), in line with the "Integrated Emission Standards for Air Pollutants" (GB16297-1996), the recovery rate of butyl acetate is 98.8% or more.
Abstract
Provided are a method and system for recovering VOCs from industrial waste gas. The VOC gases are adsorbed and recovered from industrially discharged waste gas using a combined method of mixing fluidization and cyclone adsorption, solving the problems of complicated processes, large equipment and high recovering costs of traditional VOC recovery methods and resulting in a one-time removal rate of VOCs of 98% or more without causing any secondary pollution.
Description
本发明属于环保技术领域，涉及煤化工、炼油、石油化工、精细化工、制药、印刷、涂料、油墨等领域中含丙酮、甲醇、乙醇、苯、甲苯、二甲苯、丁醇、丁酯等一种或者多种有机尾气的净化回收利用。具体地说，一种工业废气VOC回收方法及其回收系统。The invention belongs to the field of environmental protection technology, and relates to acetone, methanol, ethanol, benzene, toluene, xylene, butanol, butyl ester, etc. in the fields of coal chemical, oil refining, petrochemical, fine chemical, pharmaceutical, printing, coating, ink and the like. Purification and recycling of one or more organic tail gases. Specifically, an industrial waste gas VOC recovery method and a recovery system thereof.
挥发性有机化合物(Volatile Organic Compounds，简称VOC)是一类重要的空气污染物，沸点在50℃～260℃、室温下饱和蒸气压超过133.3Pa，是导致大气光化学烟雾形成的主要因素之一。常见的组分有碳氢化合物、苯系物、醇类、酮类、酚类、醛类、酯类、胺类、氰类等，主要来源于化工、石油化工生产过程中的方法尾气、汽车尾气、燃煤废气等。因其具有来源广泛、毒性大等特点，环境危害性较大，有些甚至具有致癌、致畸和致突变作用，已被世界各国列入优先控制的污染物。《中华人民共和国大气污染防治法》和2015年7月1日所实施的GB31570-2015《石油炼制工业污染物排放标准》等法律法规对炼焦、油气储运、工业合成皮革等行业颁布了专门的行业标准，控制这些行业VOC的排放。Volatile Organic Compounds (VOC) are an important class of air pollutants with boiling points between 50 ° C and 260 ° C and saturated vapor pressures above 133.3 Pa at room temperature, which is one of the main factors leading to the formation of atmospheric photochemical smog. Common components are hydrocarbons, benzenes, alcohols, ketones, phenols, aldehydes, esters, amines, cyanides, etc., mainly from chemical and petrochemical production processes, exhaust gas, automobiles Exhaust gas, coal-fired exhaust gas, etc. Because of its wide range of sources and high toxicity, it has a high environmental hazard, and some even have carcinogenic, teratogenic and mutagenic effects, and have been listed as priority pollutants by countries all over the world. The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution and the laws and regulations such as GB31570-2015 “Recycling Standards for Pollutants in the Petroleum Refining Industry” implemented on July 1, 2015 have issued special regulations for coking, oil and gas storage and transportation, industrial synthetic leather and other industries. The industry standard controls the emissions of VOCs in these industries.
VOC的处理方法有两类：一类是破坏性方法，如焚烧法和催化燃烧法等，将VOC转化成CO
2和H
2O；另一类是非破坏性方法，即回收法，常用的回收方法有炭吸附法、冷凝法和膜分离法，大部分方法都存在一定缺陷。常见VOC处理方法的主要优缺点汇总如下：
There are two types of VOC treatment methods: one is destructive methods, such as incineration and catalytic combustion, converting VOC to CO 2 and H 2 O; the other is non-destructive, ie, recovery, common recovery. The methods include carbon adsorption, condensation and membrane separation, and most of the methods have certain defects. The main advantages and disadvantages of common VOC processing methods are summarized as follows:
目前主要的VOC回收装置设备较为大型，组成元件较多，流程较为复杂。如专利CN201320617072.1UV-VOC废气处理装置包括光解氧化裂变室等，CN201410728190.9一种VOC分解复合净化处理装置及方法包括吸收塔、循环水池、复合分解水池等，CN201410573824.8一种含VOC废气回收净化装置包括大型纤维床、换热器、鼓风机等，CN201520015024.4高效VOC净化装置涉及吸收塔等。这些专利与本发明相比，在装置组成、设备及流程上都存在较大差异，且存在设备较为大型，组成元件较多，流程较为复杂，操作成本高等问题。因此，现在亟需一种成本低，系统设备少，易操作的VOC回收方法和装置，解决VOC净化问题。At present, the main VOC recovery equipment is relatively large, with many components and complicated processes. For example, the patent CN201320617072.1UV-VOC exhaust gas treatment device includes a photolysis and oxidation fission chamber, etc. CN201410728190.9 A VOC decomposition composite purification treatment device and method includes an absorption tower, a circulating pool, a composite decomposition pool, etc. CN201410573824.8 A VOC-containing The exhaust gas recovery and purification device includes a large fiber bed, a heat exchanger, a blower, and the like, and the CN201520015024.4 high-efficiency VOC purification device involves an absorption tower and the like. Compared with the present invention, these patents have great differences in device composition, equipment and process, and there are problems such as large equipment, large number of components, complicated process and high operating cost. Therefore, there is a need for a VOC recovery method and apparatus that is low in cost, low in system equipment, and easy to operate, and solves the problem of VOC purification.
发明内容Summary of the invention
为了解决传统VOC回收装置大型、组成元件多、流程复杂的问题，本发明提供了一种工业废气VOC回收方法与回收系统，具体方案如下：In order to solve the problems of large size, complicated components and complicated process of the conventional VOC recovery device, the present invention provides an industrial waste gas VOC recovery method and recovery system, and the specific scheme is as follows:
一种工业废气VOC回收方法，该方法包括：An industrial waste gas VOC recovery method, the method comprising:
(1)一级混合流化吸收单元：工业排放含VOC废气通过气体收集装置，由风机输送至混合流化装置，加热吹脱再生单元再生的活性炭注入混合流化装置中，利用气流作用使活性炭处于悬浮运动状态，废气和活性炭充分接触，吸附工业废气中VOC。(1) First-stage mixed fluidized absorption unit: industrial discharge VOC-containing exhaust gas passes through a gas collecting device, is sent to a mixing fluidization device by a fan, and the activated carbon regenerated by the heating and blowing regeneration unit is injected into the mixing fluidization device, and the activated carbon is activated by the air flow. In the state of suspension movement, the exhaust gas and the activated carbon are in full contact, and the VOC in the industrial waste gas is adsorbed.
(2)二级旋流吸附回收单元：新鲜活性炭颗粒注入旋流吸附装置中，同时一级混合流化吸收单元吸附后的工业废气切向进入旋流吸附装置。活性炭颗粒在类似流化床的旋转湍流流场中不断旋转，切向进入的工业废气与活性炭颗粒充分接触，活性炭颗粒吸附废气中VOC，并由旋流吸附装置底部排出。净化后气体由旋流吸附装置顶部排出。(2) Two-stage cyclone adsorption recovery unit: fresh activated carbon particles are injected into the cyclone adsorption device, and the industrial waste gas adsorbed by the first-stage mixed fluidization absorption unit is tangentially entered into the cyclone adsorption device. The activated carbon particles continuously rotate in the rotating turbulent flow field similar to the fluidized bed, and the tangentially entering industrial waste gas is in full contact with the activated carbon particles, and the activated carbon particles adsorb the VOC in the exhaust gas and are discharged from the bottom of the cyclone adsorption device. The purified gas is discharged from the top of the cyclone adsorption unit.
(3)加热吹脱再生单元：充分吸附VOC的活性炭由旋流吸附装置底部流出，进入加料机利用热氮气进行加热吹脱再生。再生后的活性炭返回混合流化装置循环使用，脱附后的VOC气体同热氮气进入催化冷凝装置。(3) Heating and blowing regeneration unit: The activated carbon which fully adsorbs VOC flows out from the bottom of the cyclone adsorption device, and enters the feeding machine to perform heat extraction and regeneration by using hot nitrogen. The regenerated activated carbon is returned to the mixing fluidization device for recycling, and the desorbed VOC gas and the hot nitrogen gas enter the catalytic condensation device.
(4)催化冷凝单元：催化冷凝后液相有机物由装置底部流出，送入后续设备，催化冷凝后气相由装置顶部排出。(4) Catalytic condensing unit: After catalytic condensation, the liquid phase organic matter flows out from the bottom of the device and is sent to the subsequent equipment. After the catalytic condensation, the gas phase is discharged from the top of the device.
优选的，所述的方法，采用流化吸附-旋流吸附组合吸附方法对工业废气VOC进行处理，混合流化吸附为一级吸附单元，旋流吸附为二级吸附单元；Preferably, in the method, the industrial waste gas VOC is treated by a fluidized adsorption-swirl adsorption combined adsorption method, the mixed fluidized adsorption is a primary adsorption unit, and the cyclone adsorption is a secondary adsorption unit;
优选的，步骤(2)中所述的方法，二级旋流吸附单元活性炭颗粒进入旋流吸附器，在旋转湍流流场中不断旋转，增加与VOC气体相界面接触，提高吸附效率；Preferably, in the method described in the step (2), the activated carbon particles of the secondary cyclone adsorption unit enter the cyclone adsorber, continuously rotate in the rotating turbulent flow field, increase the interface with the VOC gas, and improve the adsorption efficiency;
优选的，步骤(2)中所述的方法，可对二级旋流吸附单元活性炭颗粒进行有效改性，使活性炭具有更强的吸附功能和更好的机械强度，对于不同的吸附要求，可采用不同类型活性炭；Preferably, the method described in the step (2) can effectively modify the activated carbon particles of the secondary cyclone adsorption unit, so that the activated carbon has a stronger adsorption function and better mechanical strength, and for different adsorption requirements, Using different types of activated carbon;
优选的，步骤(4)中所述的方法，根据VOC成分不同调整冷凝温度，选用不同催化冷却介质冷凝VOC，利用氮气与VOC冷凝点不同，冷却介质对所有VOC进行快速冷却；Preferably, in the method described in the step (4), the condensation temperature is adjusted according to different VOC components, and the VOC is condensed by using different catalytic cooling media, and the cooling medium is used to rapidly cool all VOCs by using different condensation points of the VOC;
优选的，所述的方法，对VOC一次去除率根据VOC气体组分和要求的不同，可达到98％及以上，适用于所有VOC工况，无二次污染；Preferably, the method has a VOC removal rate of 98% or more according to VOC gas composition and requirements, and is applicable to all VOC working conditions without secondary pollution;
另一方面，本发明提供了一种工业废气VOC回收系统，该系统包括：In another aspect, the present invention provides an industrial waste gas VOC recovery system, the system comprising:
废气收集装置，用于收集工业排放含VOC废气；An exhaust gas collection device for collecting industrial emissions containing VOC exhaust gas;
与废气收集装置连接的风机，用于输送含VOC工业废气至混合流化装置；a fan connected to the exhaust gas collecting device for conveying VOC-containing industrial waste gas to the mixing fluidization device;
与风机连接的混合流化吸附装置，用于一级吸附工业废气中VOC；a mixed fluidized adsorption device connected to the fan for first-stage adsorption of VOC in industrial waste gas;
与混合流化装置连接的旋流吸附装置，用于二级吸附工业废气中VOC；a cyclone adsorption device connected to the mixing fluidization device for secondary adsorption of VOC in industrial waste gas;
与旋流吸附装置连接的加料机，利用热氮气加热再生活性炭，脱附VOC气体；The feeder connected with the cyclone adsorption device heats the activated carbon by heating with hot nitrogen to desorb the VOC gas;
与加料机连接的泵，将再生活性炭注入混合流化床；a pump connected to the feeder to inject regenerative activated carbon into the mixed fluidized bed;
与加料机连接的催化冷凝装置，用于催化冷凝VOC与热氮气。A catalytic condensing unit connected to the feeder for catalyzing the condensation of VOCs with hot nitrogen.
优选的，所述旋流吸附装置可单级或多级串、并联。Preferably, the cyclone adsorption device can be serially or in parallel in a single or multiple stages.
优选的，所述混合流化装置与旋流吸附装置串联，混合流化装置进行一级VOC气体吸附，旋流吸附装置进行二级高效VOC气体吸附。Preferably, the mixing fluidization device is connected in series with the cyclone adsorption device, the mixed fluidization device performs first-order VOC gas adsorption, and the cyclone adsorption device performs secondary high-efficiency VOC gas adsorption.
优选的，所述混合流化装置、旋流吸附装置可采用不同直径，处理不同风量的工业废气。Preferably, the mixing fluidization device and the cyclone adsorption device can adopt different diameters to process industrial waste gas with different air volumes.
优选的，所述装置系统将混合流化装置、旋流吸附装置、催化冷凝装置串联，压降小，能耗低，减少装置的总占地面积和总投资。Preferably, the device system connects the mixing fluidization device, the cyclone adsorption device, and the catalytic condensation device in series, has small pressure drop, low energy consumption, and reduces the total floor space and total investment of the device.
图1是本发明的回收系统示意图。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of the recovery system of the present invention.
符号说明：Symbol Description:
1废气收集装置；2风机；3混合流化吸附装置；4旋流吸附装置；5加料机；6泵；7催化冷凝装置。1 exhaust gas collection device; 2 fan; 3 mixed fluidized adsorption device; 4 cyclone adsorption device; 5 feeder; 6 pump; 7 catalytic condensation device.
本发明的技术构思如下：The technical idea of the present invention is as follows:
以图1为例，工厂排放的VOC废气由废气收集装置1收集，经风机2输送至混合流化吸附装置3进行一级吸附；一级吸附后废气输送至旋流吸附装置4中，同时新鲜活性炭注入旋流吸附装置4中进行二级吸附；两级吸附净化后气体由旋流吸附装置4顶部出口排出，吸附VOC活性炭由旋流吸附装置4底部进入加料机5中，同时热氮气进入加料机5中进行加热脱附再生；再生后活性炭经泵6输送至混合流化吸附装置3中，热氮气同VOC一同进入催化冷凝装置7中；催化冷凝装置7中降解后气相、液相外排至管网。Taking FIG. 1 as an example, the VOC exhaust gas discharged from the factory is collected by the exhaust gas collecting device 1 and sent to the mixed fluidized adsorption device 3 through the fan 2 for primary adsorption; after the primary adsorption, the exhaust gas is sent to the cyclone adsorption device 4, and fresh. The activated carbon is injected into the cyclone adsorption device 4 for secondary adsorption; after the two-stage adsorption purification, the gas is discharged from the top outlet of the cyclone adsorption device 4, and the adsorbed VOC activated carbon is fed into the feeder 5 from the bottom of the cyclone adsorption device 4, and the hot nitrogen enters the feed. The heating and desorption regeneration is carried out in the machine 5; after the regeneration, the activated carbon is sent to the mixed fluidized adsorption device 3 via the pump 6, and the hot nitrogen gas enters the catalytic condensation device 7 together with the VOC; the gas phase and the liquid phase are discharged after the degradation in the catalytic condensation device 7 To the pipe network.
本发明方法和装置的优点在于：The advantages of the method and apparatus of the present invention are:
采用流化吸附-旋流吸附组合吸附方法对工业废气VOC进行处理，有效提高吸附效率；利用冷凝点不同，对所有VOC进行快速冷凝，该方法可针对分离所有VOC气体；采用旋流分离器多级串联或并联，有效提高分离VOC效果；该方法适用于所有吸附VOC工况；该装置系统将混合流化装置、旋流吸附装置、催化冷凝装置串联，压降小，能耗低，减少装置的总占地面积和总投资。The industrial waste gas VOC is treated by fluidized adsorption-swirl adsorption combined adsorption method to effectively improve the adsorption efficiency; all VOCs are rapidly condensed by different condensation points, which can be used to separate all VOC gases; The series is connected in series or in parallel to effectively improve the effect of separating VOC; the method is applicable to all adsorption VOC conditions; the device system connects the mixing fluidization device, the cyclone adsorption device and the catalytic condensation device in series, the pressure drop is small, the energy consumption is low, and the device is reduced. Total floor area and total investment.
以上所述内容仅为本发明构思下的基本说明，而依据本发明的技术方案所作的任何等效变换，均应属于本发明的保护范围。The above description is only a basic description of the present invention, and any equivalent transformation made according to the technical solution of the present invention should fall within the protection scope of the present invention.
下面结合实施例对本发明进一步说明，实施例并不限制本发明的范围。The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
实施例1：Example 1:
上海某造漆厂20000Nm
3/h风量废气，VOC浓度为500mg/Nm
3，按照本发 明方法和装置进行，持续24h。经上述装置处理后的VOC排放量约为4mg/m
3(利用热脱附进样气相色谱仪)，符合《大气污染物综合排放标准》(GB16297-1996)，VOC回收率为99.2％。
A paintmaking plant in Shanghai has a 20,000 Nm 3 /h air volume exhaust gas with a VOC concentration of 500 mg/Nm 3 , which is carried out according to the method and apparatus of the present invention for 24 hours. The VOC emission after treatment by the above device is about 4mg/m 3 (using thermal desorption injection gas chromatograph), in line with the "Integrated Emission Standard of Air Pollutants" (GB16297-1996), the VOC recovery rate is 99.2%.
实施例2：Example 2:
将上述装置中，通入浓度为700mg/m
3的甲苯气体，持续24h。经上述装置处理后的甲苯排放量约为10mg/m
3(利用热脱附进样气相色谱仪)，符合《大气污染物综合排放标准》(GB16297-1996)，甲苯回收率为98.6％。
To the above apparatus, toluene gas having a concentration of 700 mg/m 3 was introduced for 24 hours. The toluene discharge after treatment by the above device is about 10 mg/m 3 (using a thermal desorption injection gas chromatograph), which complies with the "Integrated Emission Standard for Air Pollutants" (GB16297-1996), and the recovery rate of toluene is 98.6%.
实施例3：Example 3:
与实施例1基本相同，所不同的是：通入浓度900mg/m
3乙酸丁酯气体，持续24h；经上述装置处理后的乙酸丁酯排放量约为10mg/m
3以下(采用气相色谱测定检测)，符合《大气污染物综合排放标准》(GB16297-1996)，乙酸丁酯回收率为98.8％以上。
It is basically the same as Example 1, except that a concentration of 900 mg/m 3 of butyl acetate gas is passed for 24 hours; the discharge of butyl acetate after treatment by the above apparatus is about 10 mg/m 3 or less (determined by gas chromatography). Test), in line with the "Integrated Emission Standards for Air Pollutants" (GB16297-1996), the recovery rate of butyl acetate is 98.8% or more.
以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。The above description of the embodiments is merely to assist in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded
Claims (8)
- 一种工业废气VOC回收方法，该方法包括以下步骤：An industrial waste gas VOC recovery method, the method comprising the following steps:(1)一级混合流化吸收：工业排放含VOC废气通过气体收集装置，由风机输送至混合流化装置，加热吹脱再生单元再生的活性炭注入混合流化装置中，利用气流作用使活性炭处于悬浮运动状态，废气和活性炭充分接触，吸附工业废气中VOC；(1) First-stage mixed fluidization absorption: industrial discharge VOC-containing waste gas is passed through a gas collection device, and is sent from a fan to a mixed fluidization device, and the activated carbon regenerated by the heat-removing regeneration unit is injected into the mixed fluidization device, and the activated carbon is placed by the action of the gas flow. Suspended motion state, exhaust gas and activated carbon are in full contact, adsorbing VOC in industrial waste gas;(2)二级旋流吸附回收：新鲜活性炭颗粒注入旋流吸附装置中，同时一级混合流化吸收单元吸附后的工业废气切向进入旋流吸附装置。活性炭颗粒在类似流化床的旋转湍流流场中不断旋转，切向进入的工业废气与活性炭颗粒充分接触，活性炭颗粒吸附废气中VOC，并由旋流吸附装置底部排出。净化后气体由旋流吸附装置顶部排出；(2) Two-stage cyclone adsorption recovery: fresh activated carbon particles are injected into the cyclone adsorption device, and the industrial waste gas adsorbed by the first-stage mixed fluidized absorption unit is tangentially entered into the cyclone adsorption device. The activated carbon particles continuously rotate in the rotating turbulent flow field similar to the fluidized bed, and the tangentially entering industrial waste gas is in full contact with the activated carbon particles, and the activated carbon particles adsorb the VOC in the exhaust gas and are discharged from the bottom of the cyclone adsorption device. The purified gas is discharged from the top of the cyclone adsorption device;(3)加热吹脱再生：充分吸附VOC的活性炭由旋流吸附装置底部流出，进入加料机利用热氮气进行加热吹脱再生。再生后的活性炭返回混合流化装置循环使用，脱附后的VOC气体同热氮气进入催化冷凝装置；(3) Heating and blowing regeneration: The activated carbon which fully adsorbs VOC flows out from the bottom of the cyclone adsorption device, and enters the feeding machine to perform heating and blowing regeneration by using hot nitrogen. The recycled activated carbon is returned to the mixing fluidization device for recycling, and the desorbed VOC gas and the hot nitrogen gas enter the catalytic condensation device;(4)催化冷凝：催化冷凝后液相有机物由装置底部流出，送入后续设备，催化冷凝后气相由装置顶部排出。(4) Catalytic condensation: After catalytic condensation, the liquid phase organic matter flows out from the bottom of the device and is sent to the subsequent equipment. After the catalytic condensation, the gas phase is discharged from the top of the device.
- 如权利要求1所述的方法，其特征在于，所述二级旋流吸附单元活性炭颗粒进入旋流吸附器，在旋转湍流流场中不断旋转，增加与VOC气体相界面接触，提高吸附效率。The method according to claim 1, wherein the secondary cyclone adsorption unit activated carbon particles enter the cyclone adsorber and continuously rotate in the rotating turbulent flow field to increase the interface with the VOC gas to improve the adsorption efficiency.
- 如权利要求1所述的方法，其特征在于，根据VOC成分不同调整冷凝温度，选用不同催化冷却介质冷凝VOC，利用氮气与VOC冷凝点不同，冷却介质对所有VOC进行快速冷却。The method according to claim 1, wherein the condensing temperature is adjusted according to different VOC components, and the VOC is condensed by using different catalytic cooling media, and the cooling medium is used to rapidly cool all VOCs by using nitrogen and VOC condensation points.
- 一种工业废气VOC回收系统，该系统包括：An industrial waste gas VOC recovery system, the system comprising:废气收集装置(1)，用于收集工业排放含VOC废气；An exhaust gas collecting device (1) for collecting industrial emissions containing VOC exhaust gas;与废气收集装置连接的风机(2)，用于输送含VOC工业废气至混合流化装置；a fan (2) connected to the exhaust gas collecting device for conveying VOC-containing industrial waste gas to the mixing fluidizing device;与风机连接的混合流化吸附装置(3)，用于一级吸附工业废气中VOC；a mixed fluidized adsorption device (3) connected to the fan for first-stage adsorption of VOC in industrial waste gas;与混合流化装置连接的旋流吸附装置(4)，用于二级吸附工业废气中VOC；a cyclone adsorption device (4) connected to the mixing fluidization device for secondary adsorption of VOC in industrial waste gas;与旋流吸附装置连接的加料机(5)，利用热氮气加热再生活性炭，脱附VOC气体；a feeder (5) connected to the cyclone adsorption device, the activated carbon is heated and heated to desorb the VOC gas;与加料机连接的泵(6)，将再生活性炭注入混合流化床；a pump (6) connected to the feeder, injecting the regenerated activated carbon into the mixed fluidized bed;与加料机连接的催化冷凝装置(7)，用于催化冷凝VOC与热氮气。A catalytic condensing unit (7) connected to the feeder for catalyzing the condensation of VOCs with hot nitrogen.
- 如权利要求4所述的系统，其特征在于，所述的旋流吸附装置(4)可单级或多级串、并联。The system according to claim 4, characterized in that said cyclone adsorption means (4) can be connected in series or in parallel in single or multiple stages.
- 如权利要求4所述的系统，其特征在于，将混合流化装置(3)与旋流吸附装置(4)串联，混合流化装置进行一级VOC气体吸附，旋流吸附装置进行二级VOC气体吸附。The system according to claim 4, wherein the mixing fluidization device (3) is connected in series with the cyclone adsorption device (4), the mixed fluidization device performs first-order VOC gas adsorption, and the cyclone adsorption device performs secondary VOC. Gas adsorption.
- 如权利要求4所述的系统，其特征在于，混合流化装置(3)、旋流吸附装置(4)可采用不同直径，处理不同风量的工业废气。The system according to claim 4, characterized in that the mixing fluidization device (3) and the cyclone adsorption device (4) are capable of treating industrial waste gases of different air volumes with different diameters.
- 如权利要求4所述的系统，其特征在于，将混合流化装置(3)、旋流吸附装置(4)、催化冷凝装置(5)串联。System according to claim 4, characterized in that the mixing fluidization device (3), the cyclone adsorption device (4) and the catalytic condensation device (5) are connected in series.
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