CN102039078A - Method for treating multi-component foul waste gas - Google Patents
Method for treating multi-component foul waste gas Download PDFInfo
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- CN102039078A CN102039078A CN 200910204294 CN200910204294A CN102039078A CN 102039078 A CN102039078 A CN 102039078A CN 200910204294 CN200910204294 CN 200910204294 CN 200910204294 A CN200910204294 A CN 200910204294A CN 102039078 A CN102039078 A CN 102039078A
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Abstract
The invention discloses a method for treating multi-component foul waste gas. The waste gas and desulphurization absorption solution enter gas-liquid mixing conveying equipment simultaneously to be conveyed and desulphurized, and a gas-liquid mixture discharged by the gas-liquid mixing conveying equipment is subjected to gas-liquid mixing in gas-liquid contact equipment and subjected to gas-liquid separation; and the waste gas subjected to gas-liquid separation enters a biological filtering tower to be subjected to biological purification. Compared with the prior art, the method has the advantages that: the gas-liquid mixing conveying equipment realizes the desulphurization pretreatment of the waste gas while conveying the waste gas, has high gas absorption efficiency, and provides power for purifying gas and liquid. In the method, physical absorption and biological treatment are integrated, so that the multi-component foul waste gas can be completely purified; and the method has the advantages that: the purifying effect is good, the impact resistance of a biological purification treatment device is improved, the process flow is simple, the device has small floor area and is stably operated, fillers are difficult to block, and the like.
Description
Technical field
The present invention relates to the processing method that a kind of sulfur-bearing contains multi-component stink exhaust gas such as ammonia and VOCs, particularly the physical cleaning of the foul waste gas of harmful constituents such as organic sulfur compound such as sulfide hydrogen, methyl mercaptan and hydro carbons combines processing method with biological cleaning.
Background technology
The sewage-farm is one of main odor pollution source in oil plant, the urban operating mechanism, because its running temperature is higher, the uncovered operation of biochemistry pool, in normal course of operation, loss goes out a large amount of odorant pollutants, these odorant pollutants comprise hydrogen sulfide, organic sulfur compound, ammonia, benzene series thing and other VOCs pollutants such as (volatile organic matters), the worker is long-term movable in the environment that is polluted by these materials, may cause diseases such as respiratory system, digestive system, reproductive system, also may cause body disease and carcinogenic; When seriously polluted, also can make the people produce tangible dizziness, larynx painful, feel sick, acute poisoning symptom such as vomiting.
These waste gas component complexity, cause surrounding enviroment odor pollution, health is threatened, this class exhaust gas concentration is low, the component complexity is difficult to thorough purification, so the exploitation of this class waste gas pollution control and treatment is also more and more urgent.
Traditional exhaust gas treatment method such as absorption method, burning method, Production by Catalytic Combustion Process, condensation method, absorption process etc. are handled this class waste gas and uneconomical.There is the excessive shortcoming of adsorbent consumption in absorption method, the regeneration difficulty.Burning method exists energy consumption height, less economical shortcoming.Though the Production by Catalytic Combustion Process energy consumption reduces, the waste gas component complexity, the easy poison deactivation of catalyst generally needs to adopt pre-treatment step, will the material of catalyst poisoning be removed in advance.Condensation method and absorption process only can be removed the part component in this type of waste gas.It is low that this class waste gas of biological method purification has operating cost, the non-secondary pollution advantage, and at present, it is also more and more general that biotechnology is handled waste gas.Yet biological cleaning is unsatisfactory to the foul waste gas treatment effect of component complexity, generally needs multistep treatment, also exists complex component to suppressing the problem of growth of microorganism, and biological purification plant exists plant area big simultaneously, the unsettled shortcoming of purification efficiency.
CN200710031286.X proposes to adopt absorption-bio combined processing method, in this patent, absorbs and adopts common absorption equipment, bioanalysis also to adopt the filter equipment that drips commonly used, and this method can make hydrogen sulfide and ammonia clearance reach more than 99%.This method adopts conventional absorption equipment, takes up an area of greatlyyer, and in addition, when this method processing contained complex waste gas such as VOCs, waste gas purification was not thorough.
CN01127539.1 has introduced a kind of method that purifies hydrogen sulfide, and CN1133568 has introduced the method that a kind of absorption process is removed hydrogen sulfide.CN91110451.8 has introduced the method for recovering solvents in a kind of hydro carbons process.These methods all only can be removed hydrogen sulfide or hydro carbons, can not purify simultaneously.
CN01804540.5 has proposed a kind of biological purification method that agitator is housed, make the biofilm detachment and the removal of the non-activity of filling surface by agitator, thereby prolong the service life of bioreactor, this method can purify the waste gas of various components, but for the bigger sulfide waste gas of fluctuation of concentration, then be difficult to guarantee purifying rate, also bigger to the biological cleaning influence.
CN01114172.7 adopts the method for preliminary treatment-catalytic combustion, the waste gas purification that will contain complex component, this method purification efficiency height, can satisfy harsh environmental protection standard requirement, but this method energy consumption is bigger, when pollutant levels in the waste gas are especially low, reaches reaction temperature by electrical heating fully, for environmental protecting device, not very economical.
In general, emission-control equipment can produce certain power of falling and fall when handling waste gas, and the above-mentioned multi-component stink exhaust gas source majority unpowered waste gas that to be sewage-farm etc. discharge naturally, so the conveying of boosting of waste gas is an indispensable step in the waste gas processing method.In the above-mentioned processing method, waste gas is carried the general equipment such as air blast that adopt this area routine, fan-type equipment has deficiencies such as security is low, corrosion-resistant when carrying foul waste gas, only has simultaneously conveying function, do not have the exhaust-gas treatment function, need the preliminary treatment facility for multi-component stink exhaust gas, waste-gas treatment process flow is longer.
Summary of the invention
At above-mentioned the deficiencies in the prior art, the present invention proposes a kind of processing method of multi-component stink exhaust gas, by waste gas conveying and preliminary treatment are combined, carry out a biological disposal upon then, can effectively simplify technological process, improve treatment effect.
Multi-component stink exhaust gas processing method of the present invention comprises following content: waste gas and desulfurization absorption liquid enter simultaneously that the gas-liquid mixed conveying equipment is carried and desulfurization is handled, and this gas-liquid mixed conveying equipment is carried the gas-liquid mixture of discharging to carry out the laggard promoting the circulation of qi liquid of gas-liquid mixed in gas-liquid contanct equipment to separate; Waste gas after the gas-liquid separation enters biological filtering tower combined working and carries out the biological cleaning processing.
In the multi-component stink exhaust gas processing method of the present invention, the gas-liquid mixed conveying equipment is Pendular ring type gas transfer pump or gas-liquid mixing pump, the desulfurization absorption liquid is an alkaline aqueous solution, generally can use sodium hydrate aqueous solution, aqueous sodium carbonate etc., concentration is 0.1%～30% (wt), and the pH value generally is controlled to be 7.5～14, recycles during operation, when the pH value reduces to 7.5 when following, adjust by changing or replenish fresh alkali lye.In order to improve the exhuast gas desulfurization pretreating effect, can in the desulfurization absorption liquid, add suitable additive, as in order to improve treatment effect, can add the small amounts agent, have the metallic compound of catalytic action etc. organic sulfur compound.
In the multi-component stink exhaust gas processing method of the present invention, the gas-liquid mixed conveying equipment carries the gas-liquid mixture of discharging to carry out gas-liquid mixed in gas-liquid contanct equipment, realizes the desulfurization preliminary treatment of waste gas by abundant gas-liquid mixed.Gas-liquid contanct equipment can comprise that static mixer, dynamic mixer, packed tower, bubbling disperse member etc.Static mixer, dynamic mixer and packed tower can be arranged on separately on the gas-liquid mixed conveying equipment export pipeline.Bubbling disperses member can be arranged in the gas-liquid separation equipment, and this moment, gas-liquid separation equipment had the abundant contact action of gas-liquid simultaneously.The gas-liquid contanct equipment that is provided with can adopt this area to have conventional structure now, and its conduct is for making the abundant haptoreaction of gas-liquid two-phase.Gas-liquid mixed conveying equipment outlet pressure can determine that general gauge pressure is 1～100KPa, preferred 3～50KPa according to the needs of follow-up emission-control equipment.Gas-liquid mixed conveying equipment output pipe is provided with flow control valve total amount is controlled, gas-liquid mixed conveying equipment liquid-inlet and gas inlet ductwork are provided with by-pass valve control and flow detection instrument respectively, and gas flow and fluid flow are controlled respectively and detected.From the gas-liquid mixture fluid of gas-liquid mixed conveying equipment output, can enter from the gas-liquid contanct equipment bottom, also can in the middle of gas-liquid contanct equipment, enter.Preferentially enter from the bottom among the present invention, can make gas-liquid mass transfer more thorough like this, absorption efficiency is also higher.Because desulfurization is acid-base reaction, reaction speed is very fast, fully contacts mixing and get final product so the gas-liquid mixed device just reaches gas-liquid, does not need the gas-liquid time of staying of growing.
In the multi-component stink exhaust gas processing method of the present invention, the waste gas after the gas-liquid separation enters biological filtering tower combined working and carries out the biological cleaning processing, because the waste gas after the gas-liquid separation has carried out the desulfurization preliminary treatment, the component of waste gas is simplified, and helps high efficient biological purifying and handles.The biological filtering tower combined working that adopts can be the mode of this area routine, and bacteria bed is set in the biological filtering tower combined working, and bacteria bed can be selected biofiltration bed, Biotrickling filter etc.The filler of bacteria bed can be selected one or more the mixture in residual body, stalk, cotton bar, peat, active carbon, yarn fabric, animal hair, different shape engineering plastics filler, metal packing, zeolite, various porcelain balls of stem, leaf, the root of plant etc.The bacterium liquid of bacteria bed is based on purifying VOCs, and bacterium liquid can spray continuously, but also intermittent shower is provided with bacterium liquid storage tank.Bacterium liquid pH value 5～10, preferred 6～8.Bacteria bed spray bacterium liquid temp is 5～50 ℃, preferred 15～30 ℃.
The pH value of bacteria bed bacterium liquid can be regulated by acid-base solution, and the acid solution among the present invention comprises H
2SO
4, HCl, HNO
3Deng, alkaline solution comprises NaOH, KOH, Na
2CO
3, NaHCO
3, NH
3Deng.
In the inventive method, waste gas time of staying in bacteria bed is 3～180s, preferred 10～60s, because packing specific area is very big in the bacteria bed, the waste gas load is also lower, and most pollutants are promptly purified in filter bed fully in the waste gas.
In the inventive method, the time of staying 3～600s of biological filtering tower combined working bacterium liquid in bacterium liquid storage tank, preferred 5～180s, most preferably 10～60s.Difficult degradation contaminant component reservoir in than long residence time has further been improved the degradation efficiency of biological treatment by strain degradation in the waste gas.
In the multi-component stink exhaust gas processing method of the present invention, the conveying and the desulfurization preliminary treatment of waste gas organically combined, gone out the desulfurization preliminary treatment in fact when waste gas is carried.The inventive method is safe, can carry and handle conventional method such as explosive waste gas and can't carry and pretreated problem, and alkaline working solution can guarantee that whole device is not corroded by sour gas simultaneously, and the device working life prolongs, and safeguards simple.Desulfurization preliminary treatment and biological cleaning handled organically combining, can effectively handle multi-component stink exhaust gas, the clean-up effect height improves the impact resistance of biological cleaning treating apparatus, and technological process is simple, takes up an area of for a short time, and filler is difficult for stopping up, and turns round and stablizes.
Description of drawings
Fig. 1 is the Pendular ring type gas transfer pump fundamental diagram that uses in the inventive method.
Fig. 2 is a kind of mode of operation schematic flow sheet of multi-component stink exhaust gas processing method of the present invention.
Fig. 3 is the another kind of mode of operation schematic flow sheet of multi-component stink exhaust gas processing method of the present invention.
Wherein: 1-waste gas, 2-working solution (being the desulfurization absorption liquid simultaneously), 3-Pendular ring type gas transfer pump, the 4-packed tower, 5-knockout drum, 6-exhaust outlet, the fresh alkali lye inlet of 7-, the 8-bubbling disperses member, the import of 11-working solution, the 12-exhaust gas inlet, the outlet of 13-gas-liquid mixture, 14-Pendular ring type gas transfer pump housing, 15-Pendular ring type gas transfer pump pendular ring, 16-Pendular ring type gas transfer pump impeller, 20-biological filtering tower combined working, 21-bacterium liquid storage tank, the 22-purified gas.
The specific embodiment
Further specify the technology contents and the effect of multi-component stink exhaust gas processing method of the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, Pendular ring type gas transfer pump operation principle is as follows: working solution (being the desulfurization absorption liquid simultaneously) enters in the Pendular ring type gas transfer pump housing 14 by working solution import 11, when Pendular ring type gas transfer pump impeller 16 turns clockwise, because action of centrifugal force, working solution forms a sealing pendular ring 15 in Pendular ring type gas transfer pump housing 14, blade by Pendular ring type gas transfer pump impeller 16 is delivered to gas-liquid mixture outlet 13 with the waste gas supercharging of exhaust gas inlet 12, and waste gas and part working solution are delivered to outside the gas-liquid mixed equipment.
As shown in Figure 2, waste gas 1 and working solution 2 export packed tower 4 to by 3 mixing of gas-liquid mixed equipment, in packed tower 4, waste gas fully contacts with working solution and reacts, with working solution waste gas is carried out the desulfurization preliminary treatment, gas-liquid mixture is delivered to knockout drum 5 and carries out gas-liquid separation then, discharges from exhaust outlet 6 through the pretreated waste gas of desulfurization and enters next step treating apparatus, and working solutions are gone into fresh alkali lye by fresh alkali lye inlet 7 liquid and regulated the pH value in the knockout drum 5.The structure of packed tower 4 and parameter can be formed by the design of this area general knowledge definite according to waste gas.Gas-liquid mixture can and flow to be gone up by packed tower, passes through packed tower under also can and flowing to.Enter biological filtering tower combined working 20 from what exhaust outlet 6 was discharged from the bottom through the pretreated waste gas of desulfurization, the filler that bacterium liquid in the bacterium liquid storage tank 21 is continuous or the intermittent shower biological filtering tower combined working is interior, keep the suitable growing environment of microorganism, can direct discharging up to standard through the purified gas 22 after the biological treatment.
In the technological process shown in Figure 3, the packed tower 4 that cancellation is provided with separately disperses member 8 to be arranged among the working solution in the knockout drum 5 bubbling, and bubbling disperses member 8 that gas is evenly spread in the working solution, realizes the preliminary treatment of waste gas.Bubbling disperses member 8 can adopt conventional structure of distributor, as coiled distributor, a tubular type distributor etc.
The cooling device of working solution cooling can be set on the working solution circulation line, and control working solution temperature is below 50 ℃.
Embodiment 1
Sulfide hydrogen 20mg/m in the biochemical pond loss waste gas of showing to expose to the sun in certain oil refining enterprise sewage-farm
3, methyl disulfide 10mg/m
3, toluene 40mg/m
3, dimethylbenzene 60mg/m
3, flow is 2000Nm
3About/h.Adopting technological process as shown in Figure 2, is working solution (desulfurization absorption liquid) with the sodium hydrate aqueous solution, adds 1% (mass ratio) clorox in the working solution, replenishes when working solution pH value reduces to 9 and changes fresh alkali lye.Filling Dg38 packing ring in the gas-liquid contact packed tower.The biological filtering tower combined working filler adopts the peat filler, and specification 10mm * 10mm, waste gas stop the time of heating up in a steamer in bacteria bed be 20 seconds.30 ℃ of bacterium liquid temps, 15～25 ℃ of bacteria bed temperature, bacterium liquid intermittent shower, bacterium liquid pH value is 7, the time of staying of bacterium liquid in reservoir is 30 seconds.
Foul waste gas after above-mentioned technology purifies, hydrogen sulfide purifying rate 100% in the waste gas, methyl disulfide clearance 96%, toluene and dimethylbenzene clearance are 98%, this device moves 300d continuously, clearance is stablized constant.
In certain oil refining enterprise sewage-farm loss waste gas.Hydrogen sulfide 10mg/m
3, VOCs (multiple volatile organic matter) 300mg/m
3, flow is 5000Nm
3About/h.Carry out waste gas purification by Fig. 3 technology, the biological filtering tower combined working filler adopts multiaspect baton round filler, and diameter 38mm, waste gas stop the time of heating up in a steamer in bacteria bed be 50 seconds.25 ℃ of bacterium liquid temps, 10～25 ℃ of filter bed temperature, bacterium liquid sprays continuously, and bacterium liquid pH value is 6.5, and the time of staying of bacterium liquid in reservoir is 100 seconds.
After above-mentioned technology purification, hydrogen sulfide purifying rate 100%, VOCs purifying rate 99%.Exhaust emissions speed all meets Purge gas and meets existing discharging standards.
Claims (10)
1. the processing method of a multi-component stink exhaust gas, it is characterized in that: waste gas and desulfurization absorption liquid enter simultaneously that the gas-liquid mixed conveying equipment is carried and desulfurization is handled, and this gas-liquid mixed conveying equipment is carried the gas-liquid mixture of discharging to carry out the laggard promoting the circulation of qi liquid of gas-liquid mixed in gas-liquid contanct equipment to separate; Waste gas after the gas-liquid separation enters biological filtering tower combined working and carries out the biological cleaning processing.
2. in accordance with the method for claim 1, it is characterized in that: the gas-liquid mixed conveying equipment is Pendular ring type gas transfer pump or gas-liquid mixing pump, and the desulfurization absorption liquid is an alkaline aqueous solution.
3. according to claim 1 or 2 described methods, it is characterized in that: the desulfurization absorption liquid is sodium hydrate aqueous solution or aqueous sodium carbonate, and weight concentration is 0.1%～30%, and the pH value is 7.5～14.
4. in accordance with the method for claim 3, it is characterized in that: the operation of desulfurization absorption liquid recycles the time, reduces to 7.5 when following when pH value, adjusts by replacing or additional fresh alkali lye.
5. in accordance with the method for claim 1, it is characterized in that: the gas-liquid mixed conveying equipment carries the gas-liquid mixture of discharging to carry out gas-liquid mixed in gas-liquid contanct equipment, realizes the desulfurization preliminary treatment of waste gas by abundant gas-liquid mixed.
6. it is characterized in that in accordance with the method for claim 5: gas-liquid contanct equipment comprises that static mixer, dynamic mixer, packed tower or bubbling disperse member; Static mixer, dynamic mixer or packed tower are arranged on separately on the gas-liquid mixed conveying equipment export pipeline; Bubbling disperses member to be arranged in the gas-liquid separation equipment, and this moment, gas-liquid separation equipment had the abundant contact action of gas-liquid simultaneously.
7. in accordance with the method for claim 1, it is characterized in that: bacteria bed is set in the biological filtering tower combined working, and bacteria bed is selected biofiltration bed or Biotrickling filter.
8. it is characterized in that in accordance with the method for claim 7: the mixture of one or more in the residual body of the stem of the filler selection plant of bacteria bed, leaf, root, stalk, cotton bar, peat, active carbon, yarn fabric, animal hair, engineering plastics filler, metal packing, zeolite, the porcelain ball.
9. in accordance with the method for claim 7, it is characterized in that: waste gas time of staying in bacteria bed is 3～180s, and bacteria bed sprays bacterium liquid continuously, perhaps intermittent shower bacterium liquid, bacterium liquid storage tank is set, bacterium liquid pH value 5～10, bacteria bed spray bacterium liquid temp is 5～50 ℃.
10. it is characterized in that in accordance with the method for claim 9: the time of staying of biological filtering tower combined working bacterium liquid in bacterium liquid storage tank is 3～600s.
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Cited By (6)
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| CN102921275A (en) * | 2012-11-05 | 2013-02-13 | 沙隆达集团公司 | Method for treating desolvation tail gas produced by 0-0-dimethyl phosphoramidothioate |
| CN103212286A (en) * | 2013-05-11 | 2013-07-24 | 桂林理工大学 | Absorption and purification device for compost of ammonia gas |
| CN103230742A (en) * | 2013-05-11 | 2013-08-07 | 桂林理工大学 | Absorption cleaning method of composting alkaline air |
| CN104147921A (en) * | 2013-05-15 | 2014-11-19 | 北京建筑工程学院 | Device and method for processing gases with offensive odor by utilization of biofiltration-active carbon combination method |
| CN104548901A (en) * | 2014-12-31 | 2015-04-29 | 环境保护部华南环境科学研究所 | Integrated treating method for plastic pelletization waste gas |
| CN106731778A (en) * | 2017-02-17 | 2017-05-31 | 盐城工学院 | A kind of bio-trickling device and exhaust treatment system |
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2009
- 2009-10-21 CN CN 200910204294 patent/CN102039078A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921275A (en) * | 2012-11-05 | 2013-02-13 | 沙隆达集团公司 | Method for treating desolvation tail gas produced by 0-0-dimethyl phosphoramidothioate |
| CN102921275B (en) * | 2012-11-05 | 2016-02-03 | 沙隆达集团公司 | A kind of O, O-dimethyl thiophosphoryl amide produces precipitation method for treating tail gas |
| CN103212286A (en) * | 2013-05-11 | 2013-07-24 | 桂林理工大学 | Absorption and purification device for compost of ammonia gas |
| CN103230742A (en) * | 2013-05-11 | 2013-08-07 | 桂林理工大学 | Absorption cleaning method of composting alkaline air |
| CN104147921A (en) * | 2013-05-15 | 2014-11-19 | 北京建筑工程学院 | Device and method for processing gases with offensive odor by utilization of biofiltration-active carbon combination method |
| CN104147921B (en) * | 2013-05-15 | 2018-02-06 | 北京建筑大学 | A kind of apparatus and method of the activated carbon combined method processing foul gas of biofiltration |
| CN104548901A (en) * | 2014-12-31 | 2015-04-29 | 环境保护部华南环境科学研究所 | Integrated treating method for plastic pelletization waste gas |
| CN106731778A (en) * | 2017-02-17 | 2017-05-31 | 盐城工学院 | A kind of bio-trickling device and exhaust treatment system |
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Application publication date: 20110504 |