CN107661684A - Volatile organic waste gas handling process - Google Patents
Volatile organic waste gas handling process Download PDFInfo
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- CN107661684A CN107661684A CN201710596917.6A CN201710596917A CN107661684A CN 107661684 A CN107661684 A CN 107661684A CN 201710596917 A CN201710596917 A CN 201710596917A CN 107661684 A CN107661684 A CN 107661684A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
- B01D53/185—Liquid distributors
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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Abstract
The present invention relates to a kind of volatile organic waste gas handling process, it is characterised in that high concentration volatile organic waste gas enters absorption tower and progress first time washing is contacted with spray alkali lye, and being mixed into alkali liquid tank with first burst of liquid phase after gas phase discharge carries out secondary washing；Gas phase after washing is sent to thermal oxidizer and handled；After light-concentration volatile organic exhaust gas enters bio-trickling filter washing, gas phase ascends into the first packing layer, after packing layer absorption, gas phase enters dehumidifier after entering biological filter washing, gas phase portion after dehumidifying sends to oxidation furnace, partly into activated carbon adsorber, adsorbs rear emptying up to standard.
Description
Technical field
The present invention relates to industrial pollutants processing, more particularly to volatile organic waste gas VOCs handling process.
Background technology
Characteristic contaminations of the VOCs as petroleum chemical industry, be mainly derived from discharge in a organized way, storage tank uncontrollable discharge,
Process units leakage, wastewater treatment process volatilization, technique discharge and solvent volatilization etc., wherein, waste water collection is defeated and processing system is
Important distributes source.In wastewater treatment process, due to air-liquid two alternate VOCs differences in concentration gradient and environment temperature, pressure
The change of power is influenceed, and the reason such as Air Exposure technique, most of volatile organic matter are escaped from waste water, arranged with inorganization
The mode put enters atmospheric environment, brings a series of safety, environment and health hazard.
The main units of petroleum chemical enterprise waste water processing station include slop tank, homogeneous tank, oil interceptor, floation tank, aeration tank,
Sludge concentration tank and sludge dewatering system etc., the effluvium volatilized can be divided into high and low two class by pollutant concentration.Wherein, it is high
For concentration organic exhaust gas from waste water general import, oil interceptor, floation tank, homogeneous tank, slop tank etc., its waste gas is narrow-minded, but pollutes
Thing concentration is high, and toxicity is big；Low-concentration organic exhaust gas from aeration tank, oxidation ditch, sludge dewatering system etc., its waste gas tolerance compared with
Greatly, but pollutant concentration is low.At present, the VOCs treatment scheme of petroleum chemical enterprise waste water processing station include on the spot decentralized processing and
Scatter Gather+focus on two kinds.Decentralized processing can be according to the exhaust gas concentration and component in each structures, using difference on the spot
The purifier of principle, there is the advantages of strong choice of technology, high treating effect, but constructing due to petroleum chemical enterprise's wastewater treatment
Thing is more, waste gas component is complicated and unstable, and the operation investment cost of the program is high and is unfavorable for daily management.And Scatter Gather+
Existing facility and resource in factory can be relied on by focusing on, and the tolerance of waste gas between each structures and concentration be carried out mutual
Homogeneous is mended, that is, reduces cost of investment and daily running cost, improves the stability of purifier again.
Existing VOCs treatment technologies mainly include chemical oxidization method (direct burning, heat-accumulation combustion, catalysis burning), physics
Partition method (condensation, UF membrane, absorption, absorption), bioanalysis (biofiltration, bio-trickling, zinc cation), photodissociation method, low temperature
Plasma method etc..VOCs treatment technology species is various, and the technological principle of different disposal technology and equipment are different, differ from one another and
Technology is limited to.Wherein, physical partition method can be used for the recovery of VOCs in waste gas under certain condition, and other technologies then pass through
Oxidative demage VOCs molecules realize purification.In actual industrial process, due to VOCs tolerance, composition and temperature, humidity and
There is larger difference in the characteristics such as grain thing content, be often difficult to meet emission request using single treatment technology, should consider
The factors such as VOCs gas characteristic, the economy for the treatment of technology and discharge standard carry out the choice of technology.
Direct combustion method is applied to the exhaust-gas treatment that concentration is high, recovery is difficult, and using waste gas as fuel, operation requires strict, easily
Produce the products such as bioxin and cause secondary pollution；Heat-accumulation combustion method is applied to low concentration, the exhaust-gas treatment of big flow, its energy consumption
Low, treatment effeciency need to supplement a small amount of combustion assisting agent, wherein heat accumulating type catalytic oxidizer (RTO) pre-processes to gas up to 99%
It is it is required that strict；Production by Catalytic Combustion Process is applied to low volatile organic content, source of the gas stabilization and non-flammable situation, operation temperature
It is low, it is safe, aftercombustion adjuvant need to be continued.Condensation method is only applicable to that concentration is very high, discharge capacity is larger and has back
Receive the organic gas processing of value；UF membrane is applied to processing low concentration, the waste gas of big flow；It is low dense that absorption method is applied to processing
The waste gas that degree, high purification require, regeneration is relatively difficult, has strict demand to the humidity and dustiness of waste gas；Absorption process is applied to
Atm number, the waste gas of middle and high concentration are handled, technical maturity is easy to operate, and absorption efficiency is high, need to consume absorbent.Biofiltration
Suitable for large-minded, low concentration exhaust-gas treatment, its equipment is simple, and investment operating cost is low, but reaction condition is difficult to control, right
Intake air temperature change adapts to slowly, and floor space is big；Bio-trickling is applied to processing atm number, the waste gas of low concentration, the letter of its equipment
Single, pressure drop is small, is not easily blocked, and need to handle excess sludge, and operating cost is higher；Zinc cation suitable for tolerance it is smaller, it is highly concentrated
Degree, readily soluble and relatively low biological metabolism waste gas, reaction condition is easily controllable, and pressure drop is small, and need to largely provide oxygen could remain high
Degradation rate, need to handle excess sludge, and investment and operating cost are relatively low.
Patent CN101294709A is described at a kind of purification of heat accumulation type thermal oxidation reactor and low-concentration organic exhaust gas
Science and engineering skill, heat accumulation type thermal oxidation reactor are made up of Burning Room, thermal storage ceramic layer, gas distributing chamber and rotary valve, utilize rotary valve
Distributional effects, Burning Room is rotatably passed in and out waste gas, realize that accumulation of heat-heat release-cleaning is synchronously carried out, but the technique be only applicable to it is low
The processing of concentration organic exhaust gas.Patent CN104344409A describe it is a kind of handle high concentration organic contaminant waste gas method and
Device, waste heat recovery is carried out using improved integrated RTO devices, and to the high-temp waste gas of one of combustion chamber, is solved
Traditional RTO techniques can only handle the technique limitation of light-concentration volatile organic pollution waste gas, pretreatment of the device to waste gas
It is required that it is strict, it is not suitable for the VOCs treatment containing complex components such as S, P, CL.Patent CN101062463A discloses one kind
The comprehensive purifying method of foul waste gas, low-concentration organic exhaust gas use washing-adsorption treatment process, and high-concentration organic waste gas is with taking off
Attached regeneration gas, which merges, carries out concentration homogenizing-burning purified treatment, the water inlet of the technology utilization waste water processing station or to go out water washing low
Concentration organic exhaust gas, particulate matter and part aqueous component in waste gas are only washed away, the waste water for absorbing saturation is returned at waste water
Field is managed, adds additional the ease tolerance of system organic exhaust gas, high-concentration organic waste gas is unprocessed just to be merged with desorption and regeneration gas
Homogeneous, adds the operational load of subsequent combustion system, and security is low.
The content of the invention
The technical problems to be solved by the invention be for prior art present situation provide it is a kind of can simultaneously merging treatment it is more
The VOCs treatment technique of kind pollutant, to solve in the prior art, specific aim is not strong, investment cost is high, security is low, steady
Qualitative poor, high energy consumption, a series of problems such as lyosoption is expensive, purification efficiency is low.
Technical scheme is used by the present invention solves above-mentioned technical problem：The volatile organic waste gas handling process, its
It is characterised by：
High concentration volatile organic waste gas enters absorption tower from bottom and carries out first time washing, the top spray on the absorption tower
Drench alkali lye；The gas phase obtained after washing is discharged from the top on absorption tower, under the swabbing action of liquid-gas jet pump, and from alkali lye
Enter after first burst of liquid phase mixing of tank and secondary washing is carried out in the alkali liquid tank；
Liquid phase in the alkali liquid tank is included from fresh alkali lye out-of-bounds and the liquid phase from the absorption tower；From described
Alkali liquid tank extraction section liquid phase is divided into three strands；Spray alkali lye of the wherein second burst of liquid phase as the absorption tower, the 3rd burst of liquid phase
Send to downstream and carry out sewage disposal；
First burst of liquid phase and the liquid/gas flow-rate ratio of the high concentration volatile organic waste gas are 1：4~5；Described
Two bursts of liquid phases and the liquid/gas flow-rate ratio of the high concentration volatile organic waste gas are 1：50~60；The amount of the 3rd burst of liquid phase
By the Liquid level of the alkali liquid tank；
The gas phase discharged from the top of the alkali liquid tank is sent to thermal oxidizer and handled, the row up to standard of the waste gas after processing
Put；
Preferably, the liquid storage of alkali liquor absorption tower tower reactor is controlled automatically by Liquid level adjusting valve according to the liquid level of tower bottoms section
System, it is sent into alkali liquid tank and is recycled for alkali lye；Gas distributor is provided with the bottom of alkali liquor absorption tower, with uniform exhaust gas flow,
Improve absorption efficiency；Demister is provided with the top of alkali liquor absorption tower, to reduce the alkali lye amount carried secretly when organic exhaust gas rises, is subtracted
Small alkali lye loss；Liquid distribution trough is additionally provided with the top of alkali liquor absorption tower, the Part I circulation alkali from NaOH solution circulating pump
Liquid is sprayed and gone out through liquid distribution trough, to improve the distribution consistency degree of circulation alkali liquor, ensures washing absorption effect.
Preferably, in the outlet of liquid-gas jet pump provided with 2~5 meters of vertical pipeline section, to ensure from NaOH solution circulating pump
First strand of circulation alkali liquor is sufficiently mixed with organic exhaust gas in straight length.
Light-concentration volatile organic exhaust gas sends to bio-trickling filter from bottom, via lower wash in the bio-trickling filter
In area after the washing of cleaning solution, the first packing layer that gas phase portion is ascended into the middle part of bio-trickling filter, the bio-trickling filter
Top down spray the first spray liquid；After mix waste gas adsorbs via packing layer, mix waste gas is from the top of biological filter
Into the biological filter；
Supernatant of the cleaning solution part in petroleum chemical enterprise's sewage disposal biogenic sediment pond in the scrubbing section, part
For the cleaning solution formed after the first spray liquid scrubbing exhaust gas；The liquid phase extracted out from the scrubbing section bottom is divided into two strands, wherein the
Downstream is sent to as first spray liquid, second strand of cleaning solution in the top that one cleaning solution returns to the bio-trickling filter；
The ratio of first spray liquid and the light-concentration volatile organic exhaust gas is 1:500~700, described second strand
The amount of cleaning solution by the scrubbing tower Liquid level；Residence time 10~12s of the mix waste gas in bio-trickling filter filler.
Upper clear supernate of the filtrate in petroleum chemical enterprise's sewage disposal biogenic sediment pond in the biological filter 2,；From
The liquid phase that the bottom of the biological filter is extracted out is divided into two strands, wherein first burst of filtrate is as the second spray liquid, second burst of filter
Liquid sends to downstream；
The ratio of second spray liquid and the light-concentration volatile organic exhaust gas is 1:1000~2000, described second
Stock filtrate amount by the biological filter Liquid level；Residence time 20~40s of the mix waste gas in filter packing layer.
Second spray liquid sprays from the top down of the biological filter, and the gas phase to come with scrubbing tower overflow mixes,
After the second packing layer absorption in the middle part of biological filter, liquid phase falls into the filtrate area of biological filter bottom；Gas phase is from filter
Space between liquid zone and packing layer is drawn, and sends to dehumidifier；
Gas phase after dehumidifying is divided into two strands, wherein first burst of gas phase sends to described oxidation furnace；Second burst of gas phase, which enters, lives
Property charcoal adsorption tower, after charcoal absorption, emptying.
When charcoal absorption reaches saturation (tower internal drop is more than 2.0KPa) or active carbon layer heat of adsorption more than 200 DEG C
When, switch to another work；Simultaneously using pressure 0.4MPaG, the low-pressure superheated steam of 155 DEG C of temperature to having adsorbed pay sum
Activated carbon is desorbed, and the high-concentration organic waste gas for being desorbed out from activated carbon adsorber is sent into condenser, and high concentration is organic
Waste gas is cooled to 35~40 DEG C, and the liquid phase isolated is via lime set pumped back waste water processing station, and the gas phase isolated is with coming from alkali
The tail gas mixing of flow container, is sent into the processing of heat accumulating type thermal oxidizer together, and the tail gas after processing carries out qualified discharge.When desorption is tied
Shu Hou, is cooled down and nitrogen filled protection using pressure 0.4MPaG, normal temperature low-pressure nitrogen to activated carbon adsorber.
Filler in first packing layer and the second packing layer can be the days such as resin, ceramics, diatomite, polyurethane, foam
Right inert material or synthetic filling, the biomembrane that filler surface is formed by Institute of Micro-biology cover, partially halogenated thing, sulphur in waste gas
The components such as compound, ammonia nitrogen are absorbed or dissolved by the liquid film of biofilm surface, are finally degraded to CO2、H2O, inorganic salt and other material.
The absorption tower top gaseous phase enters the gas phase port of liquid-gas jet pump；First burst of liquid phase from the alkali liquid tank
Into the liquid phase port of the liquid-gas jet pump；The jet of the liquid-gas jet pump connects the alkali liquid tank.
The temperature of the high concentration volatile organic waste gas is 25~30 DEG C, pressure -20~-10KpaG, flow 3000
~6000m3/ h, tens to hundreds of milligrams every cubic metre of sulfide concentration, every cubic metre of total hydrocarbon concentration hundreds of arrive thousands of milligrams；Quilt
It is sent into after being forced into 15~30KPaG in absorption tower；
The flow of the light-concentration volatile organic exhaust gas is 30000~50000m3/ h, every cubic metre of sulfide concentration are several
Individual to tens milligrams, tens to hundreds of milligrams every cubic metre of total hydrocarbon concentration, the biology is sent into after being pressurized to 40~80KPaG
Trickling filter.
The high concentration volatile organic waste gas；The operating pressure for controlling the absorption tower is 10~20KPaG.
Liquid level in the bio-trickling filter and the biological filter is 0.8~1.2 meter.
The amount of second spray liquid is defined by maintaining the humidity of filler in the biological filter for 40~60%；Mixing
Humidity reaches saturation after waste gas is sprayed by the second spray liquid, stop of the mix waste gas after saturation in the packing layer of biological filter
20~40s of time.
The dehumidifier has two, and one opens one standby, and two are used alternatingly.
The activated carbon adsorber has two, and one opens one standby, and two are used alternatingly.
The nutrient solution is the supernatant in petroleum chemical enterprise's sewage disposal biogenic sediment pond.
Compared with existing VOCs treatment technologies, the invention has the advantages that：
1st, the features such as present invention is for the concentration of petroleum chemical enterprise's waste water processing station organic exhaust gas, flow, particle content, is adopted
The resolution focused on Scatter Gather+classification, can with reference to absorption and sorption, biological deodorization, heat-accumulation combustion treatment technology
Realize the full processing to the complex component such as sulfide, halide, ammonia nitrogen, phenols, hydrocarbon compound in organic exhaust gas, device waste liquid
Waste Water Treatment is sent back to, does not produce secondary pollution.
2nd, the lyosoption using low-concentration alkali liquor as the water-soluble component such as sulfide, ammonia nitrogen in high-concentration organic waste gas,
While absorbent cost is saved, the operational load of follow-up workshop section is also reduced；Liquid-gas jet pump is introduced, utilizes circulation alkali liquor
Aspirated as power to absorbing tower top organic exhaust gas, increase the operating pressure of base extraction waste gas, improve waste gas
Treatment effeciency.
3rd, bio-trickling filter and biological filter are combined to form combined bio tower, take full advantage of bio-trickling filter
The characteristics of equipment is simple, pressure drop is small, microbial activity is high, and biological filter is simple to operate flexibly, cost is cheap, energy consumption
Advantage low, applied widely, low-concentration organic exhaust gas is pre-processed first with bio-trickling filter, degraded in waste gas
Most of organic matter, cushioning effect is served to biological filter, reduces its operational load, combined bio tower have compared with
Good anti impulsion load ability, it is suitable for the situation of inlet gas concentration fluctuation；Using in petroleum chemical enterprise's sewage disposal biogenic sediment pond
Additional nutrient solution of the supernatant as microorganism, save the expense of special nutrient fluid.
4th, two refined filtration dehumidifiers in parallel and charcoal absorption are respectively provided with filtering means dehydration workshop section and absorption workshop section
Tower, filtering, dehumidifying, adsorption and desorption alternately, cushioning effect are served to the discharge capacity and concentration of organic exhaust gas；In activity
Charcoal adsorption tower is provided with temperature, pressure difference control system, effectively prevent the generation of activated carbon spontaneous combustion, is improving the charcoal absorption longevity
While life and efficiency, the safety and stability of plant running ensure that.
Brief description of the drawings
Fig. 1 is process chart of the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
First, the high concentration volatility from structures such as waste water general import, oil interceptor, floation tank, homogeneous tank, slop tanks
Organic exhaust gas, including sulfide, halide, ammonia nitrogen, alkene, aromatic hydrocarbon, alkane, phenols etc., through closed gas skirt Scatter Gather
Afterwards, by pipeline to high-concentration waste gas processing unit.
As shown in figure 1, under the suction of air blower 1, from waste water general import, oil interceptor, floation tank, homogeneous tank, sump oil
The temperature of the structures such as tank is 25~30 DEG C, pressure -20~-10KPaG high concentration volatile organic waste gas, flow 3000
~6000m3/ h, tens to hundreds of milligrams every cubic metre of sulfide concentration, every cubic metre of total hydrocarbon concentration hundreds of arrive thousands of milligrams, quilt
It is sent into after being forced into 15~30KPaG in alkali liquor absorption tower 2,10~20KPaG of operating pressure of alkali liquor absorption tower 2, provided with 3~8
Block column plate, column plate form can be float valve or other types, and high-concentration organic waste gas flows through each tower tray in tower from bottom to top, with
It it is 25~30 DEG C from the head temperature of alkali liquor absorption tower 2, the circulation alkali liquor counter current contacting of concentration 5%~8%, alkali lye can be
NaOH、Ca(OH)2Deng solution, most of sulfide and water-soluble gas in waste gas by after alkali liquor absorption, from tower top flow out into
Enter liquid-gas jet pump 5.
Most of sulfide and water-soluble component in waste gas are by after alkali liquor absorption, into the gas phase end of liquid-gas jet pump 5
Mouthful；The liquid storage of the bottom of alkali liquor absorption tower 2 automatically controls according to the liquid level of tower bottoms section via Liquid level adjusting valve, is sent into alkali lye
Tank 3 recycles for alkali lye.The bottoms level of alkali liquor absorption tower 2 is controlled in 0.8~1.2m.
The present embodiment is provided with gas distributor in the bottom of alkali liquor absorption tower, with uniform exhaust gas flow, improves absorption efficiency；
Demister is provided with the top of alkali liquor absorption tower, to reduce the alkali lye amount carried secretly when organic exhaust gas rises, reduces alkali lye loss；
Liquid distribution trough is additionally provided with the top of alkali liquor absorption tower, the Part I circulation alkali liquor from NaOH solution circulating pump is through liquid distribution trough
Spray, to improve the distribution consistency degree of circulation alkali liquor, ensure washing absorption effect.
Under the suction of liquid-gas jet pump 5, the organic exhaust gas after once absorbing via what circulating pump 4 was sent with coming from alkali lye
First burst of liquid phase of tank 3 mixes, and remaining sulfide and water-soluble component are further absorbed by first burst of liquid phase in waste gas.To protect
Card gas-liquid two-phase is sufficiently mixed, and in the outlet of liquid-gas jet pump 5, there is provided 2~5 meters of vertical pipeline section 51.
The ratio of organic exhaust gas and first burst of liquid phase is 4~5：1.
After gas-liquid mixture is forced into 30~70KPaG via liquid-gas jet pump 5, enter from the jet of liquid-gas jet pump
In alkali liquid tank 3, remaining sulfide and water-soluble component are absorbed by the alkali lye secondary washing in alkali liquid tank 3 in waste gas, further
The remaining sulfide washed away in waste gas, the bubbling from alkali lye and the waste gas sulfide content that goes out reaches 5 × 10-6Hereinafter, it is sent into
Heat accumulating type thermal oxidizer 6.
The present embodiment is provided with fresh alkali lye supplement interface at the top of alkali liquid tank, to maintain alkali liquor absorption systemic concentration 5%
~8%；Demister is provided with alkali liquid tank top exit, to reduce the alkali lye amount carried secretly when organic exhaust gas rises.
The liquid storage of alkali liquid tank is divided into three strands through alkali lye pumped and after being forced into 0.3~0.7MPaG.
Wherein the 3rd burst of liquid phase sends waste water processing station back to, and the uninterrupted of the 3rd burst of liquid phase is adjusted by the liquid level of alkali liquid tank 3
Valve automatically controls according to the liquid level in tank, and liquid level high maintenance is in 1.0~1.5m；Second burst of liquid phase is as absorbing liquid from alkali lye
The top of absorption tower 2 enters, and the ratio of second burst of liquid phase and organic exhaust gas is 1：50~60；First burst of liquid phase is sent into liquid-gas jet pump
5.The flow of first burst of liquid phase is adapted with the pressure of liquid-gas jet pump.
One fresh alkali lye from battery limit (BL) adds from the top of alkali liquid tank 3, to maintain concentration of lye in absorption system to exist
5%~8%.
Light-concentration volatile organic exhaust gas from structures such as aeration tank, oxidation ditch, sludge dewatering systems, through closed collection
After gas hood Scatter Gather, by pipeline to low concentration gas purifier.
Under the suction of air blower 7,25~30 DEG C of temperature, pressure -20~-10KPaG light-concentration volatile organic waste
Gas, 30000~50000m of flow3/ h, several to tens milligrams of every cubic metre of sulfide concentration, every cubic metre of total hydrocarbon concentration tens
To hundreds of milligrams, combined bio tower is sent into after being pressurized to 40~80KPaG.
Combined bio tower is made up of bio-trickling filter 81 and biological filter 82.Low-concentration organic exhaust gas initially enters life
The gas distributor of the bottom of thing trickling filter, it is sufficiently mixed rear bubbling with liquid storage in pond and goes out, flow through filling batch from bottom to top,
Filler can be the natural inert material such as resin, ceramics, diatomite, polyurethane, foam or synthetic filling, and filler surface is by micro- life
The biomembrane that thing is formed covers, and the component such as partially halogenated thing, sulfide, ammonia nitrogen in waste gas is coated over the life on filler surface
Thing film absorbs or dissolving, is degraded to CO2、H2The materials such as O, the waste gas overflowed from packing layer are come one and circulated from trickling filter
Enter after the recirculating nutrient solution spray humidification of pump 9 at the top of biological filter.
At the top of biological filter, waste gas sprays humidification by one recirculating nutrient solution from filtering ponds circulating pump 10 again
Reach saturation, the waste gas after saturation flows through packing layer from top to bottom, and filler can be that uniformity is good, flux is big, pressure drop is small, compares table
The big soil of area, compost, peat/coal, sandy soil etc.；The humidity of filler maintains 40~60%, and waste gas stops in packing layer
20~40s, residence time can be adjusted according to the size of exhaust gas flow, and the microorganism for being attached to filler surface utilizes spray liquid
And the components such as the remaining sulfide in waste gas, phenols, ammonia nitrogen are oxidized and decomposed as carbon source and the energy by the pollutant in waste gas
For CO2、H2O、S、SO4 -2、SO3 -2、NO3 -1Etc. harmless small-molecule substance, hydrogen sulfide, the clearance of ammonia reach more than 99%.
Trickling filter and the liquid storage of filtering ponds bottom are extracted out and pressurizeed by trickling filter circulating pump 9, filtering ponds circulating pump 10 respectively
It is divided into two strands after to 0.1~0.3MPaG, wherein first strand sprays as recirculating nutrient solution respectively as the first spray liquid and second
Liquid returns to respective trickling filter and filtering ponds, and second strand is used as waste water to send waste water processing station back to；Second strand of amount by trickling filter and
Liquid level controller in filtering ponds automatically controls.In the present embodiment the Liquid level of trickling filter and filtering ponds 0.8~1.2m it
Between.
The flow of spray system can be according to the parameter regulation such as tower internal drop size and the temperature of filler, humidity, viscosity.Wherein
The ratio of the first spray liquid and light-concentration volatile organic exhaust gas is 1 in trickling filter:500~700；Second spray liquid in filtering ponds
Ratio with light-concentration volatile organic exhaust gas is 1:1000~2000.
Supernatant in petroleum chemical enterprise's sewage disposal biogenic sediment pond is as nutrient liquid from trickling filter and filtering
The bottom in pond is sent into, to maintain 0.8~1.2m of liquid level of combined bio tower recirculating nutrient solution, pH value 7~8, temperature 5~30
℃。
The waste gas of biological filter bottom is sent into refined filtration dehumidifier 11, and refined filtration dehumidifier opens a standby setting using one, works as essence
When filtering the pressure drop of the inlet and outlet of dehumidifier 11 more than 2KPa, another work is switched to.Water content from refined filtration dehumidifier 11 is low
In 5%, particle content is less than 1mg/m3Waste gas be divided into two strands, wherein first strand of feeding activated carbon adsorber 12, second strand
Import in the tail gas of the top exit of alkali liquid tank 3, the flow and concentration to high-concentration organic waste gas carry out complementary homogeneous, are sent into heating power
Oxidation furnace, to ensure the safety and stability of Regenerative Combustion System.Wherein, the uninterrupted of second strand of waste gas can be according to accumulation of heat
The air inlet requirement of combustion system is matched.
One organic exhaust gas from refined filtration dehumidifier 11 enters the bottom of activated carbon adsorber 12, and activated carbon adsorber uses
One open one it is standby set, waste gas flows through active carbon layer from bottom to top, remaining alkene in waste gas, alkane, the sulphur of aromatic hydrocarbon and trace
The components such as compound, ammonia nitrogen are finally trapped by activated carbon, purify qualified tail gas and are vented from the top of activated carbon adsorber 12.Work as activity
When charcoal absorption reaches saturation (tower internal drop is more than 2.0KPa) or active carbon layer heat of adsorption more than 200 DEG C, another is switched to
Work；The activated carbon for having adsorbed pay sum is desorbed using pressure 0.4MPaG, the low-pressure superheated steam of 155 DEG C of temperature simultaneously,
After desorption terminates, activated carbon adsorber is cooled down using pressure 0.4MPaG, normal temperature low-pressure nitrogen and nitrogen charging is protected
Shield.
Condenser 13 is sent into from the high-concentration organic waste gas of the desorption of activated carbon adsorber 12 out, by high-concentration organic waste gas
35~40 DEG C are cooled to, the liquid phase isolated sends waste water processing station back to via lime set pump 14, and the gas phase isolated is with coming from alkali lye
The tail gas mixing of tank 3, heat accumulating type thermal oxidizer 6 is sent into together and is handled, the tail gas after processing carries out qualified discharge.
After desorption terminates, activated carbon adsorber is cooled down using the low-pressure nitrogen of pressure 0.4MPaG, normal temperature
And nitrogen filled protection.
Gas-liquid flow-rate ratio in the present embodiment is volume flow ratio.
Claims (9)
1. volatile organic waste gas handling process, it is characterised in that：
High concentration volatile organic waste gas enters absorption tower (2) from bottom and carries out first time washing, the top of the absorption tower (2)
Spray alkali lye；The gas phase obtained after washing is discharged from the top on absorption tower, after being mixed with first burst of liquid phase from alkali liquid tank (3)
Secondary washing is carried out in into the alkali liquid tank (3)；
Liquid phase in the alkali liquid tank (3) is included from fresh alkali lye out-of-bounds and the liquid phase from the absorption tower (2)；From institute
State alkali liquid tank (3) extraction section liquid phase and be divided into three strands；Spray alkali lye of the wherein second burst of liquid phase as the absorption tower (2), the
Three bursts of liquid phases send to downstream and carry out sewage disposal；
First burst of liquid phase and the liquid/gas flow-rate ratio of the high concentration volatile organic waste gas are 1：4~5；Described second strand
Liquid phase and the liquid/gas flow-rate ratio of the high concentration volatile organic waste gas are 1：50~60；The amount of the 3rd burst of liquid phase is by institute
State the Liquid level of alkali liquid tank (3)；
The gas phase discharged from the top of the alkali liquid tank (3) is sent to thermal oxidizer (11) and handled, and the waste gas after processing reaches
Mark discharge；
Light-concentration volatile organic exhaust gas sends to bio-trickling filter (81) from bottom, via the bio-trickling filter (81) interior bottom
In scrubbing section after the washing of cleaning solution, the first packing layer that gas phase portion is ascended into the middle part of bio-trickling filter, the biology drop
The top down in filter tank sprays the first spray liquid；After mix waste gas adsorbs via packing layer, mix waste gas is from biological filter
(82) top enters the biological filter (82)；
Sewage nutrient solution of the cleaning solution part from other sewage treatment plants in the scrubbing section, is partly washed for the first spray liquid
Wash the cleaning solution formed after waste gas；The liquid phase extracted out from the scrubbing section bottom is divided into two strands, wherein first strand of cleaning solution returns
Downstream is sent to as first spray liquid, second strand of cleaning solution in the top of the bio-trickling filter；
The liquid throughput ratio of first spray liquid and the light-concentration volatile organic exhaust gas is 1:500~700, described second
Stock cleaning solution amount by the scrubbing tower Liquid level；
Filtrate in the biological filter (82) is the supernatant in petroleum chemical enterprise's sewage disposal biogenic sediment pond；From institute
State the liquid phase bottom of biological filter (82) extracted out and be divided into two strands, wherein first burst of filtrate is as the second spray liquid, second strand
Filtrate sends to downstream；
The liquid throughput ratio of second spray liquid and the light-concentration volatile organic exhaust gas is 1:1000~200, described
The amount of two bursts of filtrate by the biological filter Liquid level；Liquid throughput ratio is 1 in biological filter:1000~2000,
Residence time 20~40s of the mix waste gas in filter packing layer；
Second spray liquid sprays from the top down of the biological filter (82), and the gas phase to come with scrubbing tower overflow mixes,
After the second packing layer absorption in the middle part of biological filter, liquid phase falls into the filtrate area of biological filter (82) bottom；Gas phase
Drawn from the space between filtrate area and packing layer, send to dehumidifier (11)；
Gas phase after dehumidifying is divided into two strands, wherein first burst of gas phase sends to described oxidation furnace (6)；Second burst of gas phase enters activity
Charcoal adsorption tower (12), after charcoal absorption, emptying.
2. volatile organic waste gas handling process according to claim 1, it is characterised in that absorption tower (2) tower overhead gas
Mutually enter the gas phase port of liquid-gas jet pump (5)；First burst of liquid phase from the alkali liquid tank (3) enters the liquid-gas jet pump
(5) liquid phase port；The jet of the liquid-gas jet pump (5) connects the washing tank 3.
3. volatile organic waste gas handling process according to claim 1 or 2, it is characterised in that the high concentration volatility
The temperature of organic exhaust gas is 25~30 DEG C, pressure -20~-10KpaG, flow are 3000~6000m3/ h, sulfide concentration are often stood
Square tens to hundreds of milligrams of rice, every cubic metre of total hydrocarbon concentration hundreds of arrive thousands of milligrams；Suction is sent into after being pressurized to 15~30KPaG
Receive in tower (2)；
The flow of the light-concentration volatile organic exhaust gas is 30000~50000m3/ h, every cubic metre of sulfide concentration is several to be arrived
Tens milligrams, tens to hundreds of milligrams every cubic metre of total hydrocarbon concentration, the bio-trickling is sent into after being pressurized to 40~80KPaG
Pond (81).
4. volatile organic waste gas handling process according to claim 3, it is characterised in that the high concentration volatility has
Machine waste gas；The operating pressure for controlling the absorption tower (2) is 10~20KPaG.
5. the volatile organic waste gas handling process according to Claims 1-4 any claim, it is characterised in that described
Liquid level in bio-trickling filter (81) and the biological filter (82) is 0.8~1.2 meter.
6. volatile organic waste gas handling process according to claim 5, it is characterised in that the amount of second spray liquid
It is defined by maintaining the humidity of the biological filter (82) interior filler for 40~60%；After mix waste gas is sprayed by the second spray liquid
Humidity reaches saturation, residence time 20~40s of the mix waste gas after saturation in the packing layer of biological filter.
7. volatile organic waste gas handling process according to claim 6, it is characterised in that the dehumidifier (11) has two
Platform, one opens one standby, and two are used alternatingly.
8. volatile organic waste gas handling process according to claim 7, it is characterised in that the activated carbon adsorber
(12) there are two, one opens one standby, and two are used alternatingly.
9. volatile organic waste gas handling process according to claim 8, it is characterised in that the nutrient solution is from stone
Change the supernatant in enterprise's sewage disposal biogenic sediment pond.
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