CN103721563A - Device and method for treating organic waste gas by catalysis and ozonation - Google Patents
Device and method for treating organic waste gas by catalysis and ozonation Download PDFInfo
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- CN103721563A CN103721563A CN201310701098.9A CN201310701098A CN103721563A CN 103721563 A CN103721563 A CN 103721563A CN 201310701098 A CN201310701098 A CN 201310701098A CN 103721563 A CN103721563 A CN 103721563A
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Abstract
The invention discloses a device and a method for treating organic waste gas by catalysis and ozonation. The method comprises the following steps: (1) the organic waste gas is collected and enters a pretreater, the waste gas is pretreated and oil drops, particulate matter, acid etchant gas and fog drops in the waste gas are intercepted; (2) after the pretreated organic waste gas is pressurized by an induced draft fan, the organic waste gas enters the cold end of a heat exchanger to be preheated; (3) the preheated organic waste gas enters a catalytic oxidation device, the organic waste gas entering the catalytic oxidation device is warmed up and then is mixed with ozone fed into the catalytic oxidation device, and the mixed gas enters a catalytic oxidation reaction region of the catalytic oxidation device to be subjected to the catalytic oxidation reaction so as to remove organic pollutants; (4) the purified gas serving as a heat source enters the hot end of the heat exchanger in the step (2) to be subjected to heat exchange and the gas subjected to heat exchange is discharged by an exhaust pipeline. When being combined with the treatment device disclosed by the invention, the treatment method disclosed by the invention has a better purifying effect on the waste gas and not only ensures purifying efficiency of the waste gas, but also is energy-saving and environment-friendly.
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 the serious harm of health is more and more become to the focus that governments at all levels and the common people pay close attention to, the VOCs treatment mode of high-efficient simple is more and more subject to people's attention.
At present, administer the commonplace method of organic exhaust gas both at home and abroad and have absorption method, absorption process, plasma method, burning method and catalytic oxidation etc.But the shortcomings such as absorption method exists, and cost is high, adsorbent absorption is saturated; Absorption process need to be selected suitable chemical agent, requires chemical agent reaction condition gentleness, considers to have the problems 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 are high.Catalytic oxidation initiation temperature is low, security good, but has the shortcoming of catalysqt deactivation.Therefore, be necessary very much to develop the VOCs treatment new technology of a kind of high-efficient simple, moderate cost.
The Chinese invention patent application that for example publication number is CN101785951A discloses a kind of purification method of organic exhaust gas, comprise organic exhaust gas pretreatment, feature is that pretreated organic exhaust gas is first carried out to concentration adjustment by activated carbon adsorption bed, then by plasma purifier, carries out purified treatment.
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 and oxidation unit, the operating temperature of this catalyst adsorption and oxidation unit is 25～200 ℃, space flow speed is 10000～180000/h, and this catalyst adsorption and oxidation unit, is characterized in that, comprises: 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 the low concentration occasion of 0.001～200ppmv for the cleaning organic waste gas concentration that becomes a mandarin.
Ozone has strong oxidizing property (E0=+2.07 volt), its oxidation-reduction potential is only second to fluorine, under desirable reaction condition, ozone can arrive most of simple substance and compound oxidation in environment their highest oxidation state, organic matter is had to strong oxidative degradation, and therefore ozonation technology is applied in and in environmental improvement engineering, should has that treatment effect is good, the effect of non-secondary pollution.
At present, ozone technology has been able to engineering application in municipal wastewater treatment plant foul gas is processed.Although ozone can be oxidized many hardly degraded organic substances, its oxidation characteristic has determined that single ozonation technology has significant limitation.The one, ozone and organic reaction selectivity are poor, can not be oxidized the organic matter of some difficult degradations, as chloroform etc.; The 2nd, single ozonation technology can not thoroughly be decomposed into CO2 and H2O by organic matter, be difficult to the removal effect that reaches higher 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 synergy, the treatment effect of raising 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 waste gas is carried out to pretreatment, oil droplet, particle, sour corrosion gas and droplet in interception waste gas;
(2) through the pretreated organic exhaust gas of step (1), after air-introduced machine supercharging, enter the preheating of heat exchanger cold junction;
(3) organic exhaust gas after preheating enters catalytic oxidizing equipment, the organic exhaust gas entering in catalytic oxidizing equipment mixes with the ozone of sending 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) through step (3) purified gas, as thermal source, enter the preheater hot junction heat exchange of step (2); Gas after heat exchange discharges by discharge duct.
Described in step (3), catalytic oxidation district interior reaction temperature is 293K-573K, and air speed scope is 6000-20000m
3/ (m
3catalyst h).
In described mixed gas, ozone concentration is 0-900ppm; Further preferably, ozone concentration scope is 30～900ppm.
Ozone oxidation catalyst described in step (3) in catalytic oxidation district is: take in aluminium oxide, active carbon, pottery, zeolite any as carrier, with any one or more the catalyst that is combined as active component of metal M n, Cu, Fe, Ni, Co, Ti or its oxide.
The present invention also provide 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;
In described catalytic oxidizing equipment, be divided into successively from bottom to top:
With the thermal treatment zone of exhaust gas inlet,
The gas mixing zone being communicated with ozone generator,
The catalytic oxidation district of built-in fixed bed reactors, is equipped with ozone oxidation catalyst in described fixed bed reactors, and top, catalytic oxidation district is provided with waste gas outlet.
As preferably, be also provided with the hot-fluid of described heat exchanger and export the discharge duct being communicated with, the waste gas outlet of described catalytic oxidizing equipment is communicated with the hot-fluid entrance of described heat exchanger.
Reacted gas directly as thermal source with react before waste gas carry out heat exchange, heat recovery, reduce energy consumption, energy-conserving and environment-protective.
In the described thermal treatment zone, be provided with electric heater, in described gas mixing zone, be provided with temperature controller, described heater is controlled by described temperature controller.Temperature controller detects the temperature in gas mixing zone, according to the start and stop of gas temperature control thermal treatment zone internal heater.When catalytic reaction efficiency is low, can improve reaction temperature by electric heater, improve organic exhaust gas and remove rate.As preferably, in the middle part of described catalytic oxidizing equipment, be provided with two-layer deflector setting up and down, the space between two-layer deflector is gas mixing zone.This deflector is how empty metallic plate, gas is played to uniform effect, waste gas after heating is entered in gas mixing zone uniformly, better mix with ozone, after uniform by deflector with the mixed mist of ozone, enter catalytic oxidation district, with catalyst even contact, improve gas cleaning efficiency.
As preferably, the pipeline that connects ozone generator and gas mixing zone runs through described gas mixing zone, and described pipeline is provided with some shower nozzles.Further preferably, some of being set to be parallel to each other in gas mixing zone of described pipeline, the shower nozzle on every is evenly arranged.Make like this ozone spraying into distribute uniformly and gas mixing zone, coordinate the effect of deflector further to guarantee that waste gas mixes with ozone.
As preferably, described catalytic oxidizing equipment outer wall is provided with heat-insulation layer.
Described preprocessor is any one or more the combination 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 that oil smoke, dust granules from polluting or blocking catalyst, prevents sour gas corrosion back segment equipment, prevents that moisture from reducing catalyst efficiency; Be provided with electric heater, when catalytic reaction efficiency is low, can improve reaction temperature, improve organic exhaust gas and remove 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 that more has strong oxidability, as hydroxyl radical free radical, increased substantially ozone oxidation efficiency, expand the scope of application of ozone oxidation, can remove most organic pollutions; O3 catalytic oxidation reaction has reduced organic pollution by the temperature range of complete oxidation, makes also can have certain treatment effeciency to organic exhaust gas under normal temperature;
Catalyst has the ability of decomposing excessive ozone simultaneously, prevents secondary pollution, guarantees qualified discharge; Before and after reaction, gas carries out heat exchange by heat exchanger, can save energy resource consumption, reach set after electric heater can progressively close, can rely on organic compound combustion to produce heat completely and maintain system operation, reduced operating cost.
Treatment process of the present invention is in conjunction with treating apparatus of the present invention, clean-up effect to waste gas is better, the for example heater in catalyst reaction device and temperature control equipment can carry out in time hyperthermic treatment when gas temperature is inadequate, the further assurance waste gas that arranges of the uniform effect synergy ozone spray feed pipeline of deflector mixes with ozone fully, after well-mixed gas is uniform by deflector again, enter catalytic oxidation district, fully mix with catalyst, hot gas after purification returns to the preheating that heat exchanger is waste gas thermal source is provided, under the synergy of above-mentioned each condition, both guaranteed the purification efficiency of waste gas, 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.
The specific embodiment
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.
Catalytic oxidizing equipment 4 comprises housing, in housing, be followed successively by the thermal treatment zone 8, gas mixing zone 7 and catalytic oxidation district 6 from bottom to top, in the thermal treatment zone 8, be provided with electric heater, 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.
At housing middle part, two regions between 5, two deflectors 5 of deflector of arranging being up and down set is gas mixing zone 7, and this deflector 5 is expanded metal, and gas is played to uniform effect.In gas mixing zone 7, establish a temperature controller, the temperature of these temperature controller induction gas mixing zone 7 interior gases, according to the start and stop of gas temperature control electric heater.
The top of gas mixing zone 7 is catalytic oxidation district 6, and the interior installation fixed bed reactors in catalytic oxidation district 6, are equipped with ozone oxidation catalyst in fixation reaction bed, and 6 tops, catalytic oxidation district are provided with waste gas outlet.
Ozone oxidation catalyst in catalytic oxidation district is: take in aluminium oxide, active carbon, pottery, zeolite any as carrier, with any one or more the catalyst that is combined as active component 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, can be set to be parallel to each other some, several shower nozzles are evenly set on every, guarantee that ozone sprays in gas mixing zone 7 uniformly, evenly mix with waste gas.
Waste gas outlet is connected to the hot-fluid entrance of heat exchanger 3 by pipeline, the outlet of the hot-fluid 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 of carrying out exhaust-gas treatment by said apparatus is as follows:
(1) organic exhaust gas enters preprocessor 1 through collecting, and waste gas is carried out to pretreatment, oil droplet, particle, sour corrosion gas and droplet in interception waste gas;
(2) through the pretreated organic exhaust gas of step (1), after air-introduced machine 2 superchargings, enter heat exchanger 3 cold junction preheatings;
(3) organic exhaust gas after preheating enters catalytic oxidizing equipment 4, the organic exhaust gas entering in catalytic oxidizing equipment 4 mixes with the ozone of sending 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;
(4) through step (3) purified gas, as thermal source, enter the preheater 3 hot junction heat exchange of step (2); Gas after heat exchange discharges by discharge duct 9.
Certain strand of organic exhaust gas containing medium/low concentration benzene series matter, adopts said apparatus of the present invention and technique, through air-introduced machine, enters catalytic oxidizing equipment processing.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.Under room temperature, can react, the purification efficiency of benzene, toluene, paraxylene reaches respectively 75%, 84%, 88%; When reaction temperature, bring up to more than 90 ℃, the purification efficiency of benzene, toluene, paraxylene all can reach more than 95%.
Above-mentioned with strand organic exhaust gas containing medium/low concentration benzene series matter, adopt equally said apparatus of the present invention and technique, when not placing catalyst, under room temperature, ozone is negligible to the purification efficiency of benzene, toluene and paraxylene, improves reaction temperature, and clean-up effect is still not obvious.
Another certain strand, containing benzene organic exhaust gas, adopts said apparatus of the present invention and technique, after pretreatment, through air-introduced machine, enters heat exchanger, then enters catalytic oxidizing equipment processing.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 ℃, the purification efficiency of benzene is about 75%-96%.
Above-mentioned same strand contains benzene organic exhaust gas, adopts treating apparatus of the same type and catalyst, and when not adopting ozone, reaction temperature need be brought up to 300-360 ℃, and the purification efficiency of benzene is about 65%-92%.
Through contrast, the existence of ozone can effectively reduce the catalytic reaction temperature of benzene exhaust air, better to the clean-up effect of benzene, guarantees that, under the prerequisite of identical purification efficiency, operation energy consumption is about the 40-60% of conventional catalytic oxidation.
Claims (10)
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 waste gas is carried out to pretreatment, oil droplet, particle, sour corrosion gas and droplet in interception waste gas;
(2) through the pretreated organic exhaust gas of step (1), after air-introduced machine supercharging, enter the preheating of heat exchanger cold junction;
(3) organic exhaust gas after preheating enters catalytic oxidizing equipment, the organic exhaust gas entering in catalytic oxidizing equipment mixes with the ozone of sending 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) through step (3) purified gas, as thermal source, enter the preheater hot junction heat exchange of step (2); Gas after heat exchange discharges by discharge duct.
2. the processing method of O3 catalytic oxidation organic exhaust gas according to claim 1, is characterized in that, described in step (3), catalytic oxidation district interior reaction temperature is 293K-573K, and air speed scope is 6000-20000m
3/ (m
3catalyst h).
3. the processing method of O3 catalytic oxidation organic exhaust gas according to claim 1, is characterized in that, in described mixed gas, ozone concentration is 30～900ppm.
4. the processing method of O3 catalytic oxidation organic exhaust gas according to claim 1, it is characterized in that, ozone oxidation catalyst described in step (3) in catalytic oxidation district is: take in aluminium oxide, active carbon, pottery, zeolite any as carrier, with any one or more the catalyst that is combined as active component of metal M n, Cu, Fe, Ni, Co, Ti or its oxide.
5. 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;
In described catalytic oxidizing equipment, be divided into successively from bottom to top:
With the thermal treatment zone of exhaust gas inlet,
The gas mixing zone being communicated with ozone generator,
The catalytic oxidation district of built-in fixed bed reactors, is equipped with ozone oxidation catalyst in described fixed bed reactors, and top, catalytic oxidation district is provided with waste gas outlet.
6. treating apparatus according to claim 5, is characterized in that, be also provided with the hot-fluid of described heat exchanger and export the discharge duct being communicated with, the waste gas outlet of described catalytic oxidizing equipment is communicated with the hot-fluid entrance of described heat exchanger.
7. treating apparatus according to claim 5, is characterized in that, in the described thermal treatment zone, is provided with electric heater, in described gas mixing zone, is provided with temperature controller, and described heater is controlled by described temperature controller.
8. treating apparatus according to claim 5, is characterized in that, described catalytic oxidizing equipment middle part is provided with two-layer deflector setting up and down, and the space between two-layer deflector is gas mixing zone.
9. treating apparatus according to claim 5, is characterized in that, the pipeline that connects ozone generator and gas mixing zone runs through described gas mixing zone, and described pipeline is provided with some shower nozzles.
10. treating apparatus according to claim 5, is characterized in that, described catalytic oxidizing equipment outer wall is provided with heat-insulation layer.
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