CN105757688A - Method and system for treating VOCs gas in sewage treatment plant - Google Patents
Method and system for treating VOCs gas in sewage treatment plant Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
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Abstract
The invention provides a method and a system for treating a VOCs gas in a sewage treatment plant, and is based on a VOCs gas absorption-desorption system, a combustion and waste heat recycling system and a wastewater treatment system. The method comprises the following specific steps: feeding a low-concentration VOCs gas in the sewage treatment plant through the VOCs gas absorption-desorption system so as to obtain a concentrated VOCs gas; combining the concentrated VOCs gas with a high-concentration VOCs gas and gases output from an anaerobic treatment unit in the sewage treatment plant to be introduced into the combustion and waste heat recycling system; introducing a certain amount of fuel and a waste gas methane generated in the wastewater treatment system so as to sufficiently combust the VOCs gas; after combustion, recycling the heat by using a waste heat boiler, feeding a part of cleaned fume at an outlet to the VOCs gas absorption-desorption system to desorb the low-concentration VOCs gas, and combining the other part of the cleaned fume with tail gases of an absorption-desorption device to be fed into a chimney for discharge.
Description
Technical field
The invention belongs to environmental protection technical field, relate to the processing method of VOCs gas, particularly relate to the processing method of a kind of sewage treatment plant VOCs gas.
Background technology
Volatile organic matter (VOCs) participates in atmospheric photochemical reaction, can form secondary organic aerosol, it may be possible to one of main source of haze.Conventional VOCs processing method has recovery technology and the big class of destruction technology two, and due to the waste gas component relative complex of sewage treatment plant's discharge, fluctuation of concentration is relatively big, and prevailing technology adopts destruction technology to carry out VOCs improvement.Wherein, combustion method is traditional VOCs treatment technology, is also that the VOCs being most widely used at present administers practical technique.
CN203336608U proposes low concentration VOC gas treatment equipment, include blower fan (1) from front to back successively, activated carbon trap (2) and burner (3), low concentration VOC pipeline (4) it is connected between described blower fan (1) and activated carbon trap (2), described low concentration VOC pipeline (4) is additionally provided with defecator (5), it is connected to normal concentration VOC pipeline (6) between described activated carbon trap (2) and burner (3), described burner (3) includes the heat-exchanging chamber (7) of bottom and the main catalytic room (8) at top, the rear portion of described burner (3) is connected to gas discharging main pipe rail (9) up to standard.This technique can not process high concentration VOCs gas, and does not utilize the methane gas of sewage disposal, and operating cost is high.
CN201410706619.4 proposes a kind of novel VOCs and processes equipment and process technique, including adsorber tank body, fixing plate, adsorbing material, air inlet, gas outlet, on-line detector, enters inert carrier mouth, discharging opening, storage tank；Being provided with ultrasonic desorption apparatus on adsorber tank body, it includes ultrasonic generator, ultrasonic conducting device.VOCs in waste gas is adsorbed by the present invention by adsorbing material, by ultrasonic desorption apparatus, the adsorbing material being adsorbed with VOCs is carried out ultrasonic desorption and realize regeneration, again the inert carrier dissolved with VOCs is easily separated, VOCs twice laid therein, inert carrier reuses, and finally re-uses heat carrier and adsorbing material carries out stripping to realize the further regeneration of adsorbing material.This technique regeneration flow process is complicated, and regeneration gas VOCs separates, recycles difficulty, and stripping gas is untreated.
CN204502718U proposes a kind of VOCs exhaust gas processing device, including waste gas prefilter, adsorption tanks, desorption tank and aerator, its feature is that waste gas prefilter connects adsorption tanks, it is connected with exhaust pipe bottom adsorption tanks, exhaust pipe divides two-way, wherein a road to connect air-introduced machine, another road connects catalytic combustion system through VOCs pipeline, desorption pot bottom is connected with VOCs pipeline, VOCs pipeline divides two-way, one road to connect air-introduced machine, another road connects catalytic combustion system, and desorption tank top is connected with the combustion-gas flow outlet of catalytic combustion system through hot gas duct；It is connected by ACF granule circulation line between adsorption tanks with desorption tank, the air inlet of outer loop pipeline connects aerator through filter screen, outer loop pipeline is coupled with the stepped interlayer in adsorption tanks, the stepped interlayer in desorption tank, can from ACF granule discharge hole for discharge after flowing through ACF granule circulation line from the ACF granule of ACF granule charge door entrance.These technique adsorption tanks, desorption tank set up separately, and investment is big, and ACF granule is carried by pipeline, and fault rate is high.
CN204563932U proposes foul gas processing unit, including foul smell enrichment facility and biodegradation unit, foul smell enrichment facility mainly includes zeolite concentration rotating wheel and heat exchanger, the runner bucket of zeolite concentration rotating wheel is provided with zeolite molecular sieve, the circumferential area of zeolite concentration rotating wheel is sequentially provided with adsorption zone, desorption district and purifying area along the direction that runner rotates, the sidewall air inlet of adsorption zone is connected with air channel, and gas outlet, adsorption zone is in communication with the outside by the aiutage being arranged on air channel；The desorption district of zeolite concentration rotating wheel is connected with heat exchanger by air channel, by the Organic substance that is adsorbed on zeolite concentration rotating wheel by after the hot-air blowing desorption in heat exchanger, entering biodegradation unit by the air outlet in desorption district to process, the gas outlet of described biodegradation unit is connected with aiutage.The VOCs technique controlling difficulty of this technique microorganism desuperheating regeneration is big, and desorption gas is easily collaborated with gas outlet, adsorption zone, causes that exhaust emissions is not up to standard.
CN100496678 proposes a kind of comprehensive purifying method of foul waste gas, is classified by VOC concentration by the foul waste gas in the multiple source of the enterprises such as oil refining, chemical industry: high VOC concentration waste gas and low VOC concentration waste gas.Low concentration VOC waste gas first washs, and then carries out adsorption cleaning, tail gas qualified discharge；Waste water after washing enters sewage farm and processes.Desorption and regeneration gas mixes with high concentration VOC waste gas and carries out concentration homogenizing-burning purified treatment.This technique increases the difficulty of sewage disposal, and flow process is complicated, and investment is big.
CN104028066A proposes a kind of VOCs exhaust gas treatment method and device, and device is mainly made up of air inlet, pretreater, airduct, fire resisting damper, demister, VOCs density monitoring system, plasma purifier, measurement and control of temperature warning system, blower fan, rotating stream tray scrubber, aiutage, blast cap.In the method, industry VOCs waste gas enters pretreater after collecting.Pretreater adopts clear water that waste gas is lowered the temperature, dust removal process.After pretreatment, waste gas is through entering plasma purifier except mist, produces high activity particle, react with the VOCs molecule in waste gas, be finally degraded to carbon dioxide and water in plasma purifier.Partial organic substances is not degradable in the plasma, generates small molecular organic acid and aerosol.Waste gas is then through removing secondary pollution after alkali liquor absorption in rotating stream tray scrubber.This technique has high concentrated organic wastewater to discharge, and investment is big, and operating cost is high.
Current combustion method mainly has flame combustion, catalysis burning, heat-accumulation combustion, heat-storage catalytic burning etc..(1) flame combustion is to be sent in the combustion furnace having flame by the waste gas containing organic gas, makes combustible component burn, changes into CO2And H2O.The clearance of VOCs is typically in more than 90%, it is adaptable to concentration is more than 3000mg m-3VOCs waste gas.(2) essence of catalysis burning is the deep oxidation effect that active oxygen participates in, and organic exhaust gas can be made when relatively low initiation temperature by catalyst, and flameless combustion occurs, and oxidation Decomposition is CO2And H2O.This method initiation temperature is low, saves the energy；Applied widely；Treatment effeciency is high, and VOCs purifying rate is typically in more than 95%；Reduce NOxGeneration；The economy of operating cost.Suitable in concentration more than 1000mg m-3VOCs waste gas.(3) heat-accumulation combustion adopts the organic exhaust gas of low concentration in thermal oxidation method process, and in operating process, gas flow direction interval reverses, and gas is heated when alternately through ceramic heat-storing bed entrance RTO, cooled during outflow RTO.This method heat recovery rate is high, and general more than 95%；Operating cost is less, and cost performance is reasonable；Removal efficiency is high, it is possible to reach 98～99%, it is adaptable to concentration is more than 450mg m-3VOCs waste gas.(4) heat-storage catalytic burning is on the basis of heat-accumulation combustion, is also adopted by flow-reversal operation, but adopts the form of catalysis burning at combustion phases.This method has higher adaptivity；Heat loss is little；Can quickly start；Without NOxGenerate；Suitable in concentration more than 450mg m-3VOCs waste gas.On the whole, combustion method is not appropriate for directly processing the VOCs waste gas of large-wind-volume low-concentration.All there is investment in prior art and operating cost is high, each emission source is individually processed, it does not have garbage carries out the shortcomings such as recycling.
Summary of the invention
It is an object of the invention to, overcome the limitation of existing burning treatment process, it is provided that the processing method of a kind of sewage treatment plant VOCs gas.The VOCs gas of high concentration and low concentration can be processed simultaneously.The object of the invention also resides in the integral combined process being applied to waste water, exhaust gas treatment unit.The methane waste product that anaerobic processing device in sewage disposal system produces can be used as fuel gas, reduce the consumption that makes of fuel gas or oil, reduce operating cost.
Technical scheme: the processing method of a kind of sewage treatment plant VOCs gas, based on VOCs gas absorption resolution system, burning and residual neat recovering system and Waste Water Treatment；Idiographic flow is that low concentration VOCs gas in Sewage Plant obtains the VOCs gas of concentration through absorption resolution system, merges with sewage treatment plant high concentration VOCs gas, anaerobic treatment unit output gas and logical sends into burning and residual neat recovering system；By introducing the methane waste product produced in a certain amount of fuel and Waste Water Treatment, make VOCs full combustion of gas；After burning, using waste heat boiler to reclaim heat, exit portion neat stress send the tail gas that absorption resolution system resolves low concentration VOCs gas, another part and adsorption and analysis device to be combined into smoke stack emission.
One in described burner reasonable selection flame combustion, catalysis burning, heat-accumulation combustion, heat-storage catalytic burner.
Volatile organic waste gas heating power incinerating and purifying system of the present invention includes adsorption and analysis device, air-introduced machine, burner, waste heat boiler and Waste Water Treatment；Wherein, air-introduced machine, incinerator and waste heat recovery plant are sequentially connected.
The concrete handling process of the present invention is: (NMHC concentration is less than 500mg/Nm for the low concentration VOCs gas in Sewage Plant3) pass through the VOCs gas that absorption resolution system obtains concentrating, with high concentration VOCs gas (NMHC concentration 2000～8000mg/Nm3) merge logical feeding burning and residual neat recovering system.By introducing the methane waste product produced in a certain amount of fuel and Waste Water Treatment, make VOCs full combustion of gas.After burning, using waste heat boiler to reclaim heat, exit portion neat stress send the tail gas that absorption resolution system resolves low concentration VOCs gas, another part and adsorption and analysis device to be combined into smoke stack emission.
One in burner reasonable selection flame combustion, catalysis burning, heat-accumulation combustion, heat-storage catalytic burner.
Using neat stress regenerative sorption device, the 10-20% that neat stress makes consumption be total amount, the recovery time is the 10-50% of adsorption time.
Enter the methane waste product also including producing in a certain amount of fuel gas or oil and Waste Water Treatment in the gaseous mixture of burner, when selecting flame combustion, it is not less than 800 DEG C by controlling flame combustion temperature, the time of staying is not less than 3s, and excess air factor is not less than 20% makes VOCs full combustion of gas.
The present invention compared with prior art has the advantages that
(1) present invention can process the VOCs gas of high concentration and low concentration simultaneously.
(2) present invention includes simultaneously or is applied to waste water, exhaust gas treatment unit, belongs to integral combined process.
(3) methane waste product that in sewage disposal system, anaerobic processing device produces can use as fuel gas, reduces the consumption that makes of fuel gas or oil, reduces operating cost.
(4) present invention can process low concentration VOCs gas and high concentration VOCs gas simultaneously, and the total removal rate of VOCs gas is more than 90%, tail gas qualified discharge.The present invention is simple and practical, and operating cost is low, and VOCs removal efficiency is high, can qualified discharge, there is significant environmental and social benefits.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method, wherein,
1. low concentration VOCs gas；2. absorption resolution system；3. resolve tail gas；4. process gas；5. high concentration VOCs gas；6. fuel gas or oil；7. waste water；8. anaerobic treatment unit；9. methane waste product；10. aerobic treatment unit；11. waste discharge；12. incinerator/thermal oxidation furnace；13. burn and residual neat recovering system；14. waste heat recovery plant；15. incineration flue gas；16. Waste Water Treatment；17. chimney.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention being further described in detail, the embodiment provided is only for illustrating the present invention, rather than in order to limit the scope of the present invention.
Embodiment 1
Idiographic flow is as shown in Figure 1.After the low concentration VOCs gas mixing that certain sewage disposal plant aeration tank, sludge concentration tank and advection settling pit produce, (tolerance is 76000Nm3/ h, NMHC concentration is 104mg/Nm3, in propane) enter runner adsorption system concentrate, obtain 6000Nm3(NMHC concentration is 1310mg/Nm to/h high concentration VOCs gas3, in propane)；Then raw with sludge dewatering equipment house property 4000Nm3(NMHC concentration is 3200mg/Nm to/h high concentration VOCs gas3, in propane) and it is combined into burning and residual neat recovering system, present case adopts heat-accumulation combustion, and ignition temperature is 600 DEG C.
Waste Water Treatment wastewater treatment capacity is 20.8m3/ h, produces 1050Nm after anaerobic treatment3The methane waste product of/h, concentration is 40～60%, enters burning and residual neat recovering system, it is not necessary to supplements fuel gas and just can realize burning completely.
20521Nm is produced after mixture combustion3The high-temperature flue gas of/h, enters waste heat boiler, reclaims the 4.1MPa middle pressure steam 3.8t/h that heat produces, is incorporated to heating network.The heat smoke of waste heat boiler outlet 10～20% is for the low concentration VOCs gas of Dissociative adsorption, and the neat stress that another part produces with adsorption and analysis device is combined into smoke stack emission.
The final gas merging discharge meets VOCs qualified discharge requirement, and the total removal rate of VOCs gas is more than 99.9%.
Embodiment 2
Idiographic flow is as shown in Figure 1.After the low concentration VOCs gas mixing that another sewage disposal plant aeration tank, sludge concentration tank and advection settling pit produce, (tolerance is 98000Nm3/ h, NMHC concentration is 135mg/Nm3, in propane) enter runner adsorption system concentrate, obtain 6000Nm3(NMHC concentration is 2200mg/Nm to/h high concentration VOCs gas3, in propane)；Then raw with sludge dewatering equipment house property 5000Nm3(NMHC concentration is 2700mg/Nm to/h high concentration VOCs gas3, in propane) and it is combined into burning and residual neat recovering system, present case adopts flame combustion, and ignition temperature is 810 DEG C, time of staying 3.4s, excess air factor 23%.
Waste Water Treatment wastewater treatment capacity is 16.7m3/ h, produces 635Nm after anaerobic treatment3The methane waste product of/h, concentration is 40～60%, with 200Nm3The supplementary fuel gas of/h enters burning and residual neat recovering system together.
16257Nm is produced after mixture combustion3The high-temperature flue gas of/h, enters waste heat boiler, reclaims heat and produces 4.1MPa middle pressure steam 5.2t/h, is incorporated to heating network.The heat smoke of waste heat boiler outlet 10～20% is for the low concentration VOCs gas of Dissociative adsorption, and the neat stress that another part produces with absorption resolution system is combined into smoke stack emission.
The final gas merging discharge meets VOCs qualified discharge requirement, and the total removal rate of VOCs gas is more than 99.9%.
The above; being only the application preferably detailed description of the invention, but the protection domain of the application is not limited thereto, any those familiar with the art is in the technical scope that the application discloses; the variations and alternatives that can readily occur in, all should be encompassed within the protection domain of the application.Therefore, the protection domain of the application should be as the criterion with scope of the claims.
Claims (7)
1. the processing method of sewage treatment plant's VOCs gas, it is characterised in that based on VOCs gas absorption resolution system, burning and residual neat recovering system and Waste Water Treatment；Idiographic flow is that low concentration VOCs gas in Sewage Plant obtains the VOCs gas of concentration through absorption resolution system, merges with sewage treatment plant high concentration VOCs gas, anaerobic treatment unit output gas and logical sends into burning and residual neat recovering system；By introducing the methane waste product produced in a certain amount of fuel and Waste Water Treatment, make VOCs full combustion of gas；After burning, using waste heat boiler to reclaim heat, exit portion neat stress send the tail gas that absorption resolution system resolves low concentration VOCs gas, another part and adsorption and analysis device to be combined into smoke stack emission.
2. the processing method of VOCs gas according to claim 1, it is characterised in that the one in described burner reasonable selection flame combustion, catalysis burning, heat-accumulation combustion, heat-storage catalytic burner.
3. the processing method of VOCs gas according to claim 1, is characterized in that using the VOCs gas of neat stress regenerative adsorption, and the 10-20% that neat stress makes consumption be total amount, the recovery time is the 10-50% of adsorption time.
4. the process technique of VOCs gas according to claim 2, it is characterized in that the methane waste product also including producing in a certain amount of fuel gas or oil and Waste Water Treatment in the described gaseous mixture entering burner, when selecting flame combustion, it is not less than 800 DEG C by controlling flame combustion temperature, the time of staying is not less than 3s, and excess air factor is not less than 20% makes VOCs full combustion of gas.
5. the process technique of VOCs gas according to claim 2, it is characterised in that the low concentration VOCs gas in Sewage Plant refers to that NMHC concentration is less than 500mg/Nm3, high concentration VOCs gas refer to NMHC concentration 2000～8000mg/Nm3；After burning, using waste heat boiler to reclaim heat, exit portion neat stress send the tail gas that absorption resolution system resolves low concentration VOCs gas, another part and adsorption and analysis device to be combined into smoke stack emission.
6. the process technique of VOCs gas according to claim 2, it is characterized in that the methane waste product also including producing in a certain amount of fuel gas or oil and Waste Water Treatment in the gaseous mixture of entrance burner, when selecting flame combustion, it is not less than 800 DEG C by controlling flame combustion temperature, the time of staying is not less than 3s, and excess air factor is not less than 20% makes VOCs full combustion of gas.
7. the process system of the sewage treatment plant's VOCs gas according to claim 1-5, it is characterized in that, enter gas burning and residual neat recovering system and Waste Water Treatment including absorption is in parallel with high concentration VOCs with the output of the process VOCs gas absorption resolution system of low concentration VOCs gas, gas absorption resolution system；Enter the methane waste product also having anaerobic treatment unit of gas burning and residual neat recovering system；After burning, using waste heat boiler to reclaim heat, exit portion neat stress send the tail gas that absorption resolution system resolves low concentration VOCs gas, another part and adsorption and analysis device to be combined into smoke stack emission.
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| CN107152691A (en) * | 2017-06-22 | 2017-09-12 | 南京艾尔普特环保科技有限公司 | Low NOx afterburnings and the efficient minimizing technologies of VOC and system based on RTO |
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