CN103721563B - A kind for the treatment of apparatus of O3 catalytic oxidation organic exhaust gas and processing method - Google Patents
A kind for the treatment of apparatus of O3 catalytic oxidation organic exhaust gas and processing method Download PDFInfo
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- CN103721563B CN103721563B CN201310701098.9A CN201310701098A CN103721563B CN 103721563 B CN103721563 B CN 103721563B CN 201310701098 A CN201310701098 A CN 201310701098A CN 103721563 B CN103721563 B CN 103721563B
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Abstract
The invention discloses a kind for the treatment of apparatus and processing method of O3 catalytic oxidation organic exhaust gas, method comprises: (1) organic exhaust gas enters preprocessor through collecting, pretreatment is carried out to waste gas, oil droplet, particle, sour corrosion gas and droplet in interception waste gas; (2) pretreated organic exhaust gas enters the preheating of heat exchanger cold junction after air-introduced machine supercharging; (3) organic exhaust gas after preheating enters catalytic oxidizing equipment, the organic exhaust gas entered in catalytic oxidizing equipment mixes with the ozone sent in catalytic oxidizing equipment after heating up, the catalytic oxidation district that mixed gas enters catalytic oxidizing equipment carries out catalytic oxidation, removes organic pollution; (4) purified gas enters the preheater hot junction heat exchange of step (2) as thermal source; Gas after heat exchange is discharged by discharge duct.Treatment process of the present invention is in conjunction with treating apparatus of the present invention, better to the clean-up effect of waste gas, has both guaranteed the purification efficiency of waste gas, again energy-conserving and environment-protective.
Description
Technical field
The present invention relates to technical field of waste gas treatment, be specifically related to a kind for the treatment of apparatus and processing method of O3 catalytic oxidation organic exhaust gas.
Background technology
In recent years, the environmental pollution that the discharge of organic exhaust gas causes and more and more become the focus that governments at all levels and the common people pay close attention to the serious harm of health, the VOCs treatment mode of high-efficient simple is more and more subject to people's attention.
At present, the method for administering organic exhaust gas commonplace both at home and abroad has absorption method, absorption process, plasma method, burning method and catalytic oxidation etc.But there is the shortcomings such as cost is high, adsorbent is saturated in absorption method; Absorption process needs to select suitable chemical agent, requires that chemical agent reaction condition is gentle, considers there is the problem such as non-secondary pollution, price simultaneously; There is the shortcomings such as energy consumption is high, purifying rate is general in plasma method; Burning method good purification, but investment and operating cost high.Catalytic oxidation initiation temperature is low, security good, but there is the shortcoming of catalysqt deactivation.Therefore, be necessary very much to develop a kind of high-efficient simple, moderate VOCs treatment new technology.
Such as publication number is the purification method that the Chinese invention patent application of CN101785951A discloses a kind of organic exhaust gas, comprise organic exhaust gas pretreatment, feature is that pretreated organic exhaust gas is first carried out concentration adjustment by activated carbon adsorption bed, then carries out purified treatment by plasma purifier.
Publication number is that the Chinese invention patent application of 102476029A discloses a kind of catalytic conversion unit for cleaning organic waste gas, it comprises Catalyst Adsorption oxidation unit, the operating temperature of this Catalyst Adsorption oxidation unit is 25 ~ 200 DEG C, space flow speed is 10000 ~ 180000/h, and this Catalyst Adsorption oxidation unit, it is characterized in that, comprise: catalyst, it is metal or metal oxide, and this metal is selected from molybdenum, manganese, iron, copper, zinc, lead, cobalt, silver or its combination; And porous carrier, it is aluminium oxide or zeolite, for carrying above-mentioned catalyst; Wherein, this catalytic conversion unit is used for the cleaning organic waste gas concentration that becomes a mandarin is the low concentration occasion of 0.001 ~ 200ppmv.
Ozone has strong oxidizing property (E0=+2.07 volt), its oxidation-reduction potential is only second to fluorine, under desirable reaction condition, ozone can simple substance most of in environment and the compound oxidation highest oxidation state to them, have strong oxidative degradation to organic matter, therefore ozonation technology is applied in environmental improvement engineering and should has that treatment effect is good, the effect of non-secondary pollution.
At present, ozone technology is able to engineer applied in the process of municipal wastewater treatment plant foul gas.Although ozone can be oxidized many hardly degraded organic substances, its oxidation characteristic determines single ozonation technology significant limitation.One is that ozone and organic reaction selectivity are poor, can not be oxidized the organic matter of some difficult degradations, as chloroform etc.; Two is that organic matter thoroughly can not be decomposed into CO2 and H2O by single ozonation technology, be difficult to reach higher removal effect simultaneously, its product is usually easy to biodegradation organic matter for carboxylic acids, as: monoaldehyde, dialdehyde, aldehydic acid, monocarboxylic acid, dicarboxylic acids organic micromolecule.
Summary of the invention
The invention provides a kind for the treatment of apparatus and processing method of O3 catalytic oxidation organic exhaust gas, catalysis and ozone oxidation act synergistically, and improve the treatment effect of organic exhaust gas.
A processing method for O3 catalytic oxidation organic exhaust gas, comprises the steps:
(1) organic exhaust gas enters preprocessor through collecting, and carries out pretreatment to waste gas, oil droplet, particle, sour corrosion gas and droplet in interception waste gas;
(2) after air-introduced machine supercharging, the preheating of heat exchanger cold junction is entered through the organic exhaust gas that step (1) is pretreated;
(3) organic exhaust gas after preheating enters catalytic oxidizing equipment, the organic exhaust gas entered in catalytic oxidizing equipment mixes with the ozone sent in catalytic oxidizing equipment after heating up, the catalytic oxidation district that mixed gas enters catalytic oxidizing equipment carries out catalytic oxidation, removes organic pollution;
(4) enter the preheater hot junction heat exchange of step (2) as thermal source through step (3) purified gas; Gas after heat exchange is discharged by discharge duct.
Described in step (3), catalytic oxidation district interior reaction temperature is 293K-573K, and space velocity range is 6000-20000m
3/ (m
3catalyst h).
In described mixed gas, ozone concentration is 0-900ppm; Further preferably, ozone concentration range is 30 ~ 900ppm.
Ozone oxidation catalyst in catalytic oxidation district described in step (3) is: with in aluminium oxide, active carbon, pottery, zeolite any one for carrier, with the catalyst being combined as active component of any one or more of metal M n, Cu, Fe, Ni, Co, Ti or its oxide.
Present invention also offers a kind of realize as described in the treating apparatus of processing method of O3 catalytic oxidation organic exhaust gas, comprise the preprocessor, air-introduced machine, heat exchanger, catalytic oxidizing equipment and the ozone generator that connect in turn;
Be divided into successively from bottom to top in described catalytic oxidizing equipment:
With the thermal treatment zone of exhaust gas inlet,
The gas mixing zone be communicated with ozone generator,
The catalytic oxidation district of built-in fixed bed reactors, described fixed bed reactors are built with ozone oxidation catalyst, and top, catalytic oxidation district is provided with waste gas outlet.
As preferably, be also provided with the discharge duct be communicated with the hot outlets of described heat exchanger, the waste gas outlet of described catalytic oxidizing equipment is communicated with the hot inlet of described heat exchanger.
Reacted gas directly carries out heat exchange, heat recovery as the waste gas before thermal source and reaction, reduces energy consumption, energy-conserving and environment-protective.
Be provided with electric heater in the described thermal treatment zone, be provided with temperature controller in described gas mixing zone, described heater is controlled by described temperature controller.Temperature controller detects the temperature in gas mixing zone, controls the start and stop of thermal treatment zone internal heater according to gas temperature.When catalytic reaction efficiency is low, improve reaction temperature by electric heater, improve organic exhaust gas removal rate.As preferably, be provided with two-layer deflector setting up and down in the middle part of described catalytic oxidizing equipment, the space between two-layer deflector is gas mixing zone.This deflector is how empty metallic plate, uniform effect is play to gas, waste gas after heating is entered in gas mixing zone uniformly, better mix with ozone, catalytic oxidation district is entered after uniform by deflector with the mixed mist of ozone, with catalyst uniform contact, improve gas cleaning efficiency.
As preferably, the pipeline connecting ozone generator and gas mixing zone runs through described gas mixing zone, and described pipeline is provided with some shower nozzles.Further preferably, described pipeline is set to some that are parallel to each other in gas mixing zone, and the shower nozzle on every root is evenly arranged.Make the ozone sprayed into distribute uniformly and gas mixing zone like this, coordinate the effect of deflector to ensure that waste gas mixes with ozone further.
As preferably, described catalytic oxidizing equipment outer wall is provided with heat-insulation layer.
Described preprocessor is the combination of any one or more in oil expeller, deduster, absorption tower, demister; Described heat exchanger is plate type heat exchanger, heat exchange of heat pipe, finned tube exchanger or case tube heat exchanger.
Beneficial effect of the present invention is as follows:
The present invention is provided with pretreatment unit, according to waste gas feature, selects suitable preprocess method, prevents oil smoke, dust granules from polluting or blocking catalyst, prevents sour gas corrosion back segment equipment, prevents moisture from reducing catalyst efficiency; Be provided with electric heater, when catalytic reaction efficiency is low, can reaction temperature be improved, improve organic exhaust gas removal rate;
Organic exhaust gas is by being equipped with the fixed bed reactors of catalyst layer, carry out O3 catalytic oxidation reaction, make ozone under catalyst action, produce the intermediate product more having Strong oxdiative ability, as hydroxyl radical free radical, increase substantially ozone oxidation efficiency, expand the scope of application of ozone oxidation, most organic pollution can be removed; O3 catalytic oxidation reaction reduces the temperature range that organic pollution is fully oxidized, and also can have certain treatment effeciency to organic exhaust gas under making normal temperature;
Catalyst has the ability of decomposing excessive ozone simultaneously, prevents secondary pollution, ensures qualified discharge; Before and after reaction, gas carries out heat exchange by heat exchanger, and can save energy resource consumption, after reaching setting, electric heater can progressively cut out, and organic compound combustion can be relied on completely to produce heat and maintain system cloud gray model, reduce operating cost.
Treatment process of the present invention is in conjunction with treating apparatus of the present invention, better to the clean-up effect of waste gas, such as, heater in catalyst reaction device and temperature control equipment can carry out hyperthermic treatment in time when gas temperature is inadequate, the arranging of uniform effect synergy ozone spray feed pipeline of deflector ensures that waste gas mixes with ozone fully further, catalytic oxidation district is entered after well-mixed gas is uniform by deflector again, fully mix with catalyst, hot gas after purification returns the preheating that heat exchanger is waste gas and provides thermal source, under the synergy of above-mentioned each condition, both the purification efficiency of waste gas had been guaranteed, energy-conserving and environment-protective again.Accompanying drawing explanation
Fig. 1 is the structural representation for the treatment of apparatus of the present invention.
Wherein, shown in figure, Reference numeral is as follows:
1-preprocessor 2-air-introduced machine 3-heat exchanger
4-catalytic oxidizing equipment 5-deflector 6-catalytic oxidation district
The 8-thermal treatment zone, 7-gas mixing zone 9-discharge duct
10-ozone generator.
Detailed description of the invention
As shown in Figure 1, a kind for the treatment of apparatus of O3 catalytic oxidation organic exhaust gas, comprises preprocessor 1, air-introduced machine 2, heat exchanger 3, catalytic oxidizing equipment 4, discharge duct 9 and ozone generator 10.
Preprocessor 1 is the combination of any one or more in oil expeller, deduster, absorption tower, demister, preprocessor outlet connects air-introduced machine 2 entrance, air-introduced machine 2 exports and connects the cold inlet of heat exchanger 3, and heat exchanger 3 is plate type heat exchanger or heat exchange of heat pipe or finned tube exchanger or case tube heat exchanger.
Catalytic oxidizing equipment 4 comprises housing, the thermal treatment zone 8, gas mixing zone 7 and catalytic oxidation district 6 is followed successively by from bottom to top in housing, be provided with electric heater in the thermal treatment zone 8, the cold flow outlet of heat exchanger 3 connects the thermal treatment zone 8 by pipeline, and access port is positioned at the below of electric heater.
Portion arranges the region between about the two pieces deflectors arranged, 5, two pieces of deflectors 5 is in the housing gas mixing zone 7, and this deflector 5 is expanded metal, plays uniform effect to gas.Establish a temperature controller in gas mixing zone 7, in this temperature controller induction gas mixing zone 7, the temperature of gas, controls the start and stop of electric heater according to gas temperature.
The top of gas mixing zone 7 is catalytic oxidation district 6, and install fixed bed reactors in catalytic oxidation district 6, fixation reaction bed is built with ozone oxidation catalyst, and top, catalytic oxidation district 6 is provided with waste gas outlet.
Ozone oxidation catalyst in catalytic oxidation district is: with in aluminium oxide, active carbon, pottery, zeolite any one for carrier, with the catalyst being combined as active component of any one or more of metal M n, Cu, Fe, Ni, Co, Ti or its oxide.
The ozone outlet of ozone generator 10 is connected in gas mixing zone 7 by pipeline, the part of this pipeline in gas mixing zone 7 runs through whole gas mixing zone 7, some that are parallel to each other can be set to, every root evenly arranges several shower nozzles, ensure that ozone sprays in gas mixing zone 7, with waste gas Homogeneous phase mixing uniformly.
Waste gas outlet is connected to the hot inlet of heat exchanger 3 by pipeline, and the hot outlets of heat exchanger 3 connects discharge duct 9, and purified gas is finally discharged by discharge duct 9 in heat exchanger 3 with after pending waste gas heat exchange.
The technological process being carried out exhaust-gas treatment by said apparatus is as follows:
(1) organic exhaust gas enters preprocessor 1 through collecting, and carries out pretreatment to waste gas, oil droplet, particle, sour corrosion gas and droplet in interception waste gas;
(2) after air-introduced machine 2 supercharging, the preheating of heat exchanger 3 cold junction is entered through the organic exhaust gas that step (1) is pretreated;
(3) organic exhaust gas after preheating enters catalytic oxidizing equipment 4, the organic exhaust gas entered in catalytic oxidizing equipment 4 mixes with the ozone sent in catalytic oxidizing equipment 4 after heating up in gas mixing zone 7, the catalytic oxidation district 6 that mixed gas enters catalytic oxidizing equipment 4 carries out catalytic oxidation, removes organic pollution;
Catalytic oxidation district 6 reaction temperature is 293K-573K, and space velocity range is 6000-20000m
3/ (m
3catalyst h); Ozone concentration range is 30 ~ 900ppm.
(4) enter the preheater 3 hot junction heat exchange of step (2) as thermal source through step (3) purified gas; Gas after heat exchange is discharged by discharge duct 9.
Embodiment 1
Certain strand, containing the organic exhaust gas of medium/low concentration benzene series matter, adopts said apparatus of the present invention and technique, enters catalytic oxidizing equipment process through air-introduced machine.Catalyst carrier adopts γ type aluminium oxide, and active component adopts manganese oxide, and load capacity is about 5%.The concentration of ozone and benzene homologues is respectively 70mg/m
3and 15mg/m
3.Can react under room temperature, the purification efficiency of benzene, toluene, paraxylene reaches 75%, 84%, 88% respectively; When reaction temperature brings up to more than 90 DEG C, the purification efficiency of benzene, toluene, paraxylene all can reach more than 95%.
Above-mentioned same stock is containing the organic exhaust gas of medium/low concentration benzene series matter, and same employing said apparatus of the present invention and technique, when not placing catalyst, under room temperature, the purification efficiency of ozone to benzene, toluene and paraxylene is negligible, and improve reaction temperature, clean-up effect is still not obvious.
Embodiment 2
Certain stock another, containing benzene organic exhaust gas, adopts said apparatus of the present invention and technique, enters heat exchanger after pretreatment through air-introduced machine, then enter catalytic oxidizing equipment process.Catalyst carrier adopts γ type aluminium oxide, and active component adopts the mixture of cobalt oxide and chromium oxide, and the ratio of cobalt and chromium is 4:1, and load capacity is 8.5-10%.The concentration ratio of ozone and benzene is about 10:1, and when reaction temperature is 100-150 DEG C, the purification efficiency of benzene is about 75%-96%.
Above-mentioned same stock is containing benzene organic exhaust gas, and adopt treating apparatus of the same type and catalyst, when not adopting ozone, reaction temperature need bring up to 300-360 DEG C, and the purification efficiency of benzene is about 65%-92%.
Through contrast, the existence of ozone effectively can reduce the catalytic reaction temperature of benzene exhaust air, and better to the clean-up effect of benzene, under ensureing the prerequisite of identical purification efficiency, operation energy consumption is about the 40-60% of Conventional catalytic oxidation reaction.
Claims (5)
1. a processing method for O3 catalytic oxidation organic exhaust gas, is characterized in that, comprises the steps:
(1) organic exhaust gas enters preprocessor through collecting, and carries out pretreatment to waste gas, oil droplet, particle, sour corrosion gas and droplet in interception waste gas;
(2) after air-introduced machine supercharging, the preheating of heat exchanger cold junction is entered through the organic exhaust gas that step (1) is pretreated;
(3) organic exhaust gas after preheating enters catalytic oxidizing equipment, the organic exhaust gas entered in catalytic oxidizing equipment mixes with the ozone sent in catalytic oxidizing equipment after heating up, the catalytic oxidation district that mixed gas enters catalytic oxidizing equipment carries out catalytic oxidation, removes organic pollution; Ozone oxidation catalyst in described catalytic oxidation district is: with in aluminium oxide, active carbon, pottery, zeolite any one for carrier, with the catalyst being combined as active component of any one or more of metal M n, Cu, Fe, Ni, Co, Ti or its oxide; In mixed gas, ozone concentration is 30 ~ 900ppm;
(4) enter the preheater hot junction heat exchange of step (2) as thermal source through step (3) purified gas; Gas after heat exchange is discharged by discharge duct.
2. the processing method of O3 catalytic oxidation organic exhaust gas according to claim 1, it is characterized in that, described in step (3), catalytic oxidation district interior reaction temperature is 293K-573K, and space velocity range is 6000-20000m
3/ (m
3catalyst h).
3. realize a treating apparatus for the processing method of O3 catalytic oxidation organic exhaust gas as claimed in claim 1, it is characterized in that, comprise the preprocessor, air-introduced machine, heat exchanger, catalytic oxidizing equipment and the ozone generator that connect in turn;
Be divided into successively from bottom to top in described catalytic oxidizing equipment:
With the thermal treatment zone of exhaust gas inlet,
The gas mixing zone be communicated with ozone generator,
The catalytic oxidation district of built-in fixed bed reactors, described fixed bed reactors are built with ozone oxidation catalyst, and top, catalytic oxidation district is provided with waste gas outlet;
Be provided with electric heater in the described thermal treatment zone, be provided with temperature controller in described gas mixing zone, described heater is controlled by described temperature controller;
Be provided with two-layer deflector setting up and down in the middle part of described catalytic oxidizing equipment, the space between two-layer deflector is gas mixing zone;
The pipeline connecting ozone generator and gas mixing zone runs through described gas mixing zone, and described pipeline is provided with some shower nozzles.
4. treating apparatus according to claim 3, it is characterized in that, be also provided with the discharge duct be communicated with the hot outlets of described heat exchanger, the waste gas outlet of described catalytic oxidizing equipment is communicated with the hot inlet of described heat exchanger.
5. treating apparatus according to claim 3, it is characterized in that, described catalytic oxidizing equipment outer wall is provided with heat-insulation layer.
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| CN110953599A (en) * | 2019-12-20 | 2020-04-03 | 广东佳德环保科技有限公司 | VOCs waste gas catalytic combustion system and method |
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