Background technology
The waste gas that exhaust-gas treatment refers to produce at industrial site, factory floor is externally carrying out preliminary treatment before the discharging, to reach the external emission standards of national waste gas.General exhaust-gas treatment comprises aspects such as organic exhaust-gas treatment, dust exhaust-gas treatment, soda acid exhaust-gas treatment, peculiar smell exhaust-gas treatment and air disinfection sterilizing and purifying.
Common waste gas processing method has active carbon adsorption, Production by Catalytic Combustion Process, chemical washing method, acid-base neutralization method, plasma method, photocatalytic oxidation etc.For example, the processing method of organic exhaust gas has the condensation absorption method, absorption method, and Production by Catalytic Combustion Process, spray process etc., inorganic waste gases mostly pass through water-soluble, acid-base neutralization, methods such as strong oxidation are handled.In practical operation, can be with two or more methods in conjunction with handling waste gas.
The waste gas that produces with the rubber for tire industry is example.The peculiar smell waste gas that the banbury of rubber for tire industry, vulcanizer produce in process of production can cause very big influence to on-site, external environment.Along with the raising of country to rubber enterprise factory gas discharge standard, be about to put into effect new national standard, require relevant enterprise to handle gas, after sulfide and organic volatile are up to standard, can discharge.At present the gas with foreign flavor that produces of process of factory production adopts direct discharging modes, and along with the output of tire constantly increases, a large amount of gas with foreign flavor can produce the environment of periphery and have a strong impact on.
At the particularity of rubber industry exhaust gas constituents, higher because of its VOCs and element sulphur content, adopt thoroughly all organic principles in the purifying exhaust air of single chemical absorption method, therefore, often adopt the waste gas processing method of several different methods associating.Common compound mode has: chemical absorbing+active carbon adsorption; Plasma+photocatalytic oxidation; Chemical absorbing+photocatalytic method; Chemical absorbing+plasma method etc.
It is better that active carbon adsorption is handled the organic exhaust gas effect, but because it exists resistance big, energy consumption is big, and material all drawbacks such as reaches capacity easily and limits its use; Though the processing method of existing plasma or chemical absorbing and catalytic oxidation associating can solve the big problem of equipment self resistance, has drawback equally.Plasma and photochemical catalytic oxidation combined techniques principle are to make harmful components cracking in the waste gas by high electric energy, thereby reach the purification purpose, so this method will be very big if will handle atm number waste gas consumed power.
CN101366966A relates to a kind of method and device of foul gas purified treatment, by optimizing integrated ultraviolet catalytic and ozonation technology, with the processing of the foul gas that adapts to variable concentrations and composition.In this invention, ultraviolet catalytic and ozone oxidation are carried out in same reactor.
The waste gas processing method of existing and plasma or photocatalysis associating is to adopt waste gas directly to enter plasma or light to facilitate in the reative cell and interact with it, and waste gas directly contacts with reactor.Because rubber for tire industry exhaust gas constituents particularity, it is many to contain volatile organic matter (oils), cause methods such as catalytic oxidation and plasma after operation a period of time, cover oily cumulative on the generator, cause catalysqt deactivation or light to pass plasma generator and the treatment effect of equipment is reduced greatly, this is the serious problems that present rubber tyre industry waste gas treatment equipment exists.
At present, most of waste gas treatment equipments adopt chemistry spray absorption process.This method is remarkable for handling the higher industrial waste gas effect of element sulphur content, but the method water loss is big, and the secondary waste water pollution problem is serious.
The utility model content
The purpose of this utility model is at prior art problems, proposes the exhaust gas purification and treatment device of a kind of economic and practical, energy-conserving and environment-protective, advanced technology, makes exhaust-gas treatment reach cleaner production and environment protection emission requirement.Especially, the utility model simultaneously, is saved operating cost to a great extent to refining glue and vulcanizing workshop section's exhaust gas discharged and can more effectively handle, and realizes social benefit, economic benefit, the tripartite unification of environmental benefit.
For reaching this purpose, the utility model by the following technical solutions:
The utility model provides a kind of method for purifying and processing waste gas, and described method employing chemical absorption method is combined with the superoxide radical oxidizing process waste gas is carried out purified treatment; Described superoxide radical oxidizing process generates superoxide radical and the off-gas oxidizing decomposition is separately carried out.
Superoxide radical oxidizing process described in the utility model refers to excite by natural daylight the pure air effect of catalyst surface energy state electronics and pre-wetted, produce the extremely strong groups of oxidisability such as great amount of hydroxy group free radical, oxygen radical, ozone, harmful components are had an effect in this group and the waste gas, with the method for its decomposition.
The utility model employing chemical absorption method combines with the superoxide radical oxidizing process waste gas is carried out purified treatment, earlier by sulphur-containing substance and a part of oleaginous material in the chemical absorption method removal waste gas, by the outside superoxide radical that adds, organic matter and other foul gas thoroughly are decomposed into carbon dioxide and water then.So, adopt cleverly mode with oxidation decomposition course and superoxide radical generative process separately, the catalysqt deactivation problem of having avoided oil-containing waste gas to cause with direct contact of superoxide radical generator, improve device processes efficient, security performance and service life greatly, also can reduce operating cost simultaneously.Those skilled in the art can be known concrete technical flow design according to prior art, in design process, the mixed oxidization of superoxide radical generation and waste gas and superoxide radical separated carry out realizing the utility model purpose.
Chemical absorption method described in the utility model adopts the spray mode to carry out, and is different with general industry waste water composition and processing requirements at it to the waste water behind the spray, carries out circulating after special technological design is handled and uses as spray liquid.Waste water after the utility model will spray carries out specific aim and handles the allotment that the back participates in spray liquid, carry out recycling, not only avoid the spray absorption process to produce the second pollution of wastewater problem, and saved water loss in the spray liquid allocation process and the damage rate of equipment itself in a large number.
Waste water behind the spray described in the utility model carries out successively that fluid separating treatment, waste water physicochemical are handled, participate in the allotment of spray liquid after the filtration treatment; Preferably, described waste water physicochemical is handled the ozone Oxidation Treatment method that adopts.
Preferably, the waste water behind the described spray is handled after buffering again, handles the allotment that the back participates in spray liquid, and described spray liquid carries out chemical absorbing to waste gas after cushioning.Waste water behind the spray can be regulated water yield hydraulic pressure through buffering, reduces the impact to sewage treatment equipment.In practical operation, the technical staff can carry out index by automatic checkout equipment and detect, when treating that the concentration of pollutant reaches certain limit in the spray liquid, carry out the processing of waste water again, and the not high waste water of pollutant levels is handled continuously, avoid to a certain extent sewage treatment equipment continuously, run without interruption, reduce energy resource consumption.The spray liquid that is deployed into enters sprinkling equipment again through buffering, can reduce the impact to sprinkling equipment equally, makes the operation of sprinkling equipment more stable.
Method described in the utility model comprises that gas sampling, waste gas preliminary treatment, spray absorb and spray waste water is handled and recycling, superoxide radical oxidation and gas discharging automatically.
Waste gas preliminary treatment described in the utility model is oil removing and/or dust removal process.Described superoxide radical oxidizing process is made superoxide radical at first separately, mixes with waste gas after making superoxide radical be full of oxidizing chamber fully again, carries out off-gas oxidizing and handles.The manufacturing equipment of superoxide radical arranges separately, and waste gas does not enter this equipment but directly enters oxidation Decomposition equipment, has avoided in the superoxide radical generator that harmful components directly contact the problem that causes catalysqt deactivation in the catalyst and waste gas.
The kind complexity of waste gas, not only containing gas pollutant also may have dust and greasy dirt, and dust and greasy dirt can impact the normal operation of spray system, therefore need to carry out earlier the waste gas preliminary treatment before purifying beginning, to only containing the waste gas of dust, carry out dedusting by sack cleaner; To the waste gas that only contains greasy dirt at first by the preliminary treatment oil removing; For not only contain dirt but also contain the waste gas of greasy dirt should first oil removing after dedusting, waste gas after the oil removing dedusting carries out chemical absorption method through the spray cleaning device earlier to be handled, carry out last purified treatment through superoxide radical oxidation module again, purify gas up to standard and be discharged into outdoor.
When handling rubber industry waste gas, remove a part of oily substance by screen cloth earlier; Remove sulphur-containing substance and a part of oleaginous material with chemical absorption method then; Indoor in oxidation Decomposition subsequently, start the superoxide radical generating means in advance, after free radical was full of the oxidation Decomposition chamber, waste gas entered, and organic matter and other foul gas thoroughly was decomposed into carbon dioxide and water in that oxidation Decomposition is indoor; At last, by clean gas behind the demister through smoke stack emission.
The utility model provides a kind of device of realizing aforesaid method for purifying and processing waste gas, and described device comprises chemical absorbing unit and oxidation Decomposition unit; Described oxidation Decomposition unit comprises superoxide radical generator arranged apart and oxidation Decomposition device.
Other unit of the utility model device can be known from prior art by those skilled in the art, as gas sampling unit, waste gas pretreatment unit, gas vent unit etc., the concrete parts design of each unit also can obtain from prior art, all can realize the utility model purpose.The utility model is arranged apart with superoxide radical generator and oxidation Decomposition device, waste gas after chemical absorbing is handled, directly do not enter the oxidation Decomposition that the oxidation Decomposition device carries out pollutant, but start the superoxide radical generator in advance, penetrate catalyst sheet by illumination and excite high energy electron, produce oxide groups such as hydroxyl radical free radical, oxygen radical and ozone ion, make it be full of the oxidation Decomposition device fully.Harmful substances such as the waste gas after chemical absorbing is handled enters in the oxidation Decomposition device that is full of superoxide radical then, the volatile organic matter in the waste gas and superoxide radical react, and generate harmless CO
2And H
2O thoroughly removes pollutant.So, protect the catalyst sheet in the superoxide radical generator not destroyed and inactivation by harmful components in the waste gas, improved treatment effect, saved the frequent more fund input of catalyst changeout of conventional method.
Chemical absorbing described in the utility model unit comprises spray absorber, and described spray absorber bottom is connected with the wastewater treatment cycling element, and described wastewater treatment cycling element is connected with the whirlwind sprinkler part on spray absorber top.Described wastewater treatment cycling element comprises fluid separator, waste water physicochemical treating apparatus, filter and the automatic deployment device of spray liquid that connects successively; Described fluid separator is connected with the bottom of spray absorber, and the automatic deployment device of described spray liquid is connected with the whirlwind sprinkler part.
The utility model presets plate in the spray absorber body, the waste gas spiral is risen, evenly spray spray liquid downwards by the whirlwind sprinkler part, thereby the waste gas on formation screw stream and evenly downward spray liquid head-on collision reach the purpose of removing sulfurous pollutants and solubility organic pollution in the waste gas.Because the whirlwind sprinkler part is micropore high-pressure atomization shower nozzle, spiralling waste gas stream has in addition increased the contact area of harmful components and spray liquid in the waste gas greatly, has improved purification efficiency.Waste water behind the spray enters the fluid separator successively, and waste water physicochemical treating apparatus and filter are handled.In the materialization processing procedure, the ozone that adopts ozone generator to produce carries out oxidation Decomposition to the organic matter in the waste water, and the filtrate that the materialization processing procedure produces also enters in next step processing synchronously, guarantees that overall process does not have sewage discharge.Water after the processing enters the automatic deployment device of spray liquid, prepares required spray chemical absorbing liquid.Deployed spray liquid pumps into the whirlwind sprinkler part by high-pressure pump, waste gas is sprayed to absorb handle.So, finish the recycling of the whole waste gas absorption process aqueous solution.
The bottom of spray absorber described in the utility model is communicated with the fluid separator box after connecting buffer unit; The automatic deployment device of described spray liquid with connect the whirlwind sprinkler part again after buffer unit is connected.Be provided with fluid level transmitter in the described buffer unit, can monitor the water level in the buffer unit at any time.
Preferably, described buffer unit inside is divided into waste water chamber and spray liquid chamber; Be connected into the fluid separator box after described spray absorber bottom connects the waste water chamber, the automatic deployment device of described spray liquid connects the whirlwind sprinkler part after connecting the spray liquid chamber.
Waste water behind the spray enters in the waste water chamber, when treating that pollutant levels reach certain limit, makes waste water enter the wastewater treatment cycling element and handles.The waste water of handling participates in the allotment of spray liquid, enters the spray liquid chamber, is pressed into the whirlwind sprinkler part by high-pressure pump and sprays, and whole spray absorbs with waste water treatment process and can move continuously.
Described device also comprises automatic control system.Be provided with ozone generator in the waste water physicochemical treating apparatus described in the utility model.Described filter is six grades of filtering tanks.The automatic deployment device of described spray liquid is provided with lye tank and pH meter, when the waste water after utilizing processing carries out the allotment of spray liquid, monitors the pH value in real time by pH meter, and the control lye tank is regulated.Can use 3% liquid sodium hydroxide solution in the described lye tank, also packed alkali of available solid.
Device described in the utility model comprises gas sampling unit, waste gas pretreatment unit, chemical absorbing unit, oxidation Decomposition unit and the gas vent unit that connects successively.
Described gas sampling unit is point-to-point air quantity gathering system.
Because generally there are many production equipments in the industrial enterprise workshop, waste gas comes from the device fabrication process, tyre vulcanizer for example, point-to-point air quantity gathering system by with the interlock of device signal, according to the waste gas time of origin with send concentration and adopt corresponding negative pressure air draught air quantity, the electric weight that has overcome the large tracts of land air draught like this expends, also improved simultaneously the waste gas assimilation effect of respective point, system software controls is adopted in unlatching and toxic emission for whole workshop multiple devices, distributes air draught air quantity, the switching of fan housing and the interlock of corresponding waste gas treatment equipment.
Waste gas pretreatment unit described in the utility model is metal filter screen.Described oxidation Decomposition unit is divided into superoxide radical generator and oxidation Decomposition device, and described chemical absorbing unit and superoxide radical generator together are connected into the oxidation Decomposition device.
Device described in the utility model also comprises the gas on-line monitoring system that is arranged at each unit.
Described gas on-line monitoring system is equipped with different gas monitoring instruments in each stage of exhaust-gas treatment flow process, the front end that enters spray absorber at waste gas is provided with online flue gas analyzer, monitoring is in real time collected exhaust gas concentration and is changed, and regulates chemical absorbing and oxidation Decomposition intensity with this.Hydrogen sulfide and sulfur dioxide sulfides and volatile organic contaminant monitor are arranged between spray absorber and oxidation Decomposition device, monitor the effect that spray absorber is deviate from sulfide and volatile organic contaminant in real time, adapt to the deodorizing demand with this concentration of regulating alkali lye in the automatic deployment device of spray liquid.End at the gas deliverying unit is equipped with the tail gas monitor, and gas componant is got rid of in monitoring in real time and whether concentration reaches the environmental protection standard requirement, and the track record related data, preserves outlet data according to demand.All Monitoring Data are regulated foundation as whole system, and can be with the form output of form.The workflow management system of systematized monitoring system, completeization is the guarantee that whole system is able to stable operation.
Compare with the prior art scheme, the utlity model has following beneficial effect:
1, the oxidation decomposition course of superoxide radical generative process and waste gas separates and carries out, avoid in the waste gas harmful components directly to contact with the superoxide radical generator and cause catalysqt deactivation, the high efficiency of realization equipment, energy saving are specially adapted to volatile organic contaminant and the higher waste gas of element sulphur content.
2, the utility model has been realized the automatic processing of spray spent process water and recycling, and the automatic allotment of spray liquid, has solved the problem of conventional method secondary pollution and water content consumption.
3, each unit of the utility model device is reasonable in design, and integrated degree height, whole waste gas treatment process can be realized full-automatic control, the treatment effeciency height, and treatment effect can be guaranteed.
The specific embodiment
For the utility model is described better, be convenient to understand the technical solution of the utility model, typical but non-limiting embodiment of the present utility model is as follows:
A kind of exhaust gas purification and treatment device, described device comprise gas sampling unit, waste gas pretreatment unit, chemical absorbing unit, oxidation Decomposition unit, gas vent unit and the gas on-line monitoring system that connects successively.Described gas sampling unit is point-to-point air quantity gathering system.Described waste gas pretreatment unit is metal filter screen 1.Described oxidation Decomposition unit is divided into superoxide radical generator 12 and oxidation Decomposition device 14, and described chemical absorbing unit and superoxide radical generator 12 together are connected into oxidation Decomposition device 14.
Described chemical absorbing unit comprises spray absorber 2, and described spray absorber 2 bottoms are connected with the wastewater treatment cycling element.Described wastewater treatment cycling element comprises the automatic deployment device 10 of fluid separator 6, waste water physicochemical treating apparatus 7, filter 9 and spray liquid that connects successively.Described fluid separator 6 is connected with the bottom of spray absorber 2, and the automatic deployment device 10 of described spray liquid is connected with whirlwind sprinkler part 3.
The bottom of described spray absorber 2 preferably connects buffer unit 4 backs and is communicated with fluid separator box 6; The automatic deployment device 10 of described spray liquid with connect whirlwind sprinkler part 3 again after buffer unit 4 is connected.Be provided with fluid level transmitter 5 in the described buffer unit 4.
The preferred version of buffer unit 4 is: described buffer unit 4 inside are divided into waste water chamber and spray liquid chamber.Described spray absorber 2 bottoms are connected into fluid separator box 6 after connecting the waste water chamber, connect whirlwind sprinkler part 3 after the automatic deployment device 10 of described spray liquid connects the spray liquid chamber.
Be provided with ozone generator 8 in the described waste water physicochemical treating apparatus 7.Described filter 9 is six grades of filtering tanks.The automatic deployment device 10 of described spray liquid is provided with lye tank and pH meter 11.
The concrete course of work is as follows:
At first by point-to-point air quantity gathering system the waste gas at each production equipment place is collected, entered the waste gas pretreatment system and carry out dedusting and/or oil removing preliminary treatment, enter spray absorber 2 then.In spray absorber 2, adopt high pressure to collide reverse spray process, waste gas is fully contacted with spray liquid, reach best removal effect.Spray liquid is by after the recycling of a period of time, the valid density of spray liquid reduces gradually, the oils that contains, residue, poisonous and harmful substance concentration raise gradually, when reaching upper limit of concentration, the on-line monitoring instrument sends signal, automatic control system with the discharge of wastewater in the spray absorber 2 to buffer unit 4.Start superoxide radical generator 12 in advance, penetrate catalyst sheet 13 by illumination and excite high energy electron, produce oxide groups such as hydroxyl radical free radical, oxygen radical and ozone ion, make it be full of oxidation Decomposition device 14 fully.Harmful substances such as the waste gas after chemical absorbing is handled enters in the oxidation Decomposition device 14 that is full of superoxide radical, the volatile organic matter in the waste gas and superoxide radical react, and generate harmless CO
2And H
2O thoroughly removes pollutant, enters gas vent unit then, and through chimney 15 dischargings, the tail gas monitor can be monitored composition and the concentration of gas in real time by the clean gas behind the demister.
Spray waste water in the buffer unit 4 is monitored its concentration in real time by online pollutant levels monitoring equipment, when this concentration reaches certain limit, waste water enters fluid separator 6, waste water physicochemical treating apparatus 7 and filter 9 successively and handles, waste water after the processing enters the allotment that the automatic deployment device 10 of spray liquid participates in spray liquid, in allocation process, by pH meter 11 its pH value is monitored, can automatically adjust by the alkali lye in the lye tank.Deployed spray liquid enters in the buffer unit 4, when to be needed, the spray liquid that stores in the buffer unit 4 is pressed in the whirlwind sprinkler part 3 by high-pressure pump, continues waste gas is absorbed processing, make that the spray liquid in the spray absorber 2 remains stable spray cleaning ability.According to the concentration of waste gas, automatic control system can dynamic adjustments be changed the replacement cycle of spray liquid.According to the monitoring of fluid level transmitter 5 in the buffer unit 4, when reducing, liquid level starts allotment automatically, when the spray liquid amount of meeting the requirements of of allotment, stop allotment automatically.
Each unit of the present utility model all is provided with supervising device, is provided with exhaust-valve when equipment breaks down, and prevents the situation of polluting the workshop.Whole system comprises the electronic and operated pneumatic valve of pipeline control, and corresponding flow instrumentation, so that automatic management.
The mode that the utility model at first adopts off-gas oxidizing decomposable process and superoxide radical generative process to separate is avoided catalysqt deactivation, with in the past directly the contact catalysis oxidizing process compare, reduced the frequent more fund input of catalyst changeout; Secondly, because the chemical absorbing device is improved, development one cover chemical absorbing liquid automatic circulating system has overcome the pollution problem of conventional method secondary waste water, simultaneously, has also reduced the water content consumption of this method and the damage rate of equipment itself; Again, equipment itself is consumed power not substantially, and compares with active carbon and other combined methods, and this treatment system resistance is little, has reduced the power consumption of blower fan to a great extent.In addition, this system adopts whole-course automation control, and human cost reduces.The utility model has not only improved the exhaust-gas treatment effect and has saved operating cost greatly.
Specific embodiment
Pending exhaust gas constituents: contain R-SH, SO
x, methylbenzene, formaldehyde, H
2Foul gas such as S, Ammonia, methyl mercaptan, nitrogen oxide, VOCs.
Above-mentioned waste gas is carried out purified treatment by the utility model device and method, and the maximum exhaust-gas treatment amount of uniprocesser system is 70000 ~ 80000m
3/ h, most of exhaust gas constituents treatment effeciency reaches more than 99%, and each main component treatment effeciency is as follows:
Applicant's statement, the utility model illustrates detailed construction feature of the present utility model and processing method by above-described embodiment, but the utility model is not limited to above-mentioned detailed construction feature and processing method, does not mean that namely the utility model must rely on above-mentioned detailed construction feature and processing method could be implemented.The person of ordinary skill in the field should understand; to any improvement of the present utility model; to the increase of the equivalence replacement of the selected parts of the utility model and accessory, the selection of concrete mode etc., all drop within protection domain of the present utility model and the open scope.