The dry method desorption apparatus of organic exhaust gas active-carbon absorption
Technical field
The present invention relates to a kind of exhaust-gas treatment field, particularly relate to a kind of dry method desorption apparatus of organic exhaust gas active-carbon absorption.
Background technology
Active carbon has specific area preferably and very strong absorption, decolours and the performance that eliminates the unusual smell, and therefore usually is used as the adsorbing medium of circularly purifying system, comes poisonous, polluter in absorbing waste gas, the waste water.
At present, use more adsorption desorption retracting device mainly to comprise: air cleaner, adsorption tanks, condenser, separation be with, quick-fried inflator etc., and two or above adsorption tanks are simultaneously or be used alternatingly.Its adsorption process is following: after waste gas is removed small suspended particulate through air cleaner, get into the top of adsorption tanks, after jar interior charcoal absorption, remove harmful components, the Purge gas of allow compliance with emission standards is discharged into outdoor through blower fan.On the contrary, its desorption and regeneration process is following: after active carbon has used a period of time, its surface adsorption certain amount of solvent (service time, length was decided according to the content and the production time length of body weight), need carry out desorption and regeneration.Spray into from pot bottom with steam during regeneration, steam the solvent that adsorbs in the active carbon, become liquid through condenser condenses again, get into cylinder, Separation and Recovery organic solvent, raffinate get into quick-fried inflator, discharge through behind the quick-fried gas.
With reference to application number is the Chinese patent of " 200510200344.8 ", discloses a kind of " automatic reclaiming process for industrial organic exhaust gas ", the method that this patent adopts steam desorption, static layering to reclaim.Though utilize that the steam desorption has that the heat of transformation is high, desorption fully, be prone to characteristics such as condensation; But also there be the shortcoming the same: when desorption with traditional desorption; Have a large amount of water vapor condensations in the adsorption layer of active carbon; Though the process dry wind purges but the water content of active carbon is still very high, influences its absorption property, has reduced adsorption efficiency; In addition, steam temperature is higher, has just accomplished desorption such as need and has carried out adsorption process at once, and active carbon also can influence its desorption efficient under the temperature condition with higher.Therefore will overcome above-mentioned technical problem, certainly will need to add proper device equipment and treatment process, increase production cost, investment is big.
Summary of the invention
The object of the invention provides a kind of dry method desorption apparatus that adopts the exhaust gas active-carbon absorption of organic solvents such as dry type desorption benzene, alcohol, ketone, fat, gasoline.
For achieving the above object, the technical scheme that the present invention adopts is:
A kind of dry method desorption apparatus of organic exhaust gas active-carbon absorption; It comprises be in parallel a plurality of adsorption tanks that are filled with active carbon, the waste gas transfer passage that is used to carry organic exhaust gas, the pure qi (oxygen) transfer passage that is used for delivery of purge gas, the steam raising plant that is used to make high temperature desorption steam that is provided with, the solvent recovery unit that is used to collect the desorption solvent; Described waste gas transfer passage, adsorption tanks, pure qi (oxygen) transfer passage constitute absorbed portion; Described steam raising plant, adsorption tanks, solvent recovery unit constitute the desorption part; Be provided with the flue gas leading of the organic exhaust gas that is used to flow through, the steam pipe of the desorption steam that is used to flow through in the described adsorption tanks; Described steam pipe is arranged in the described flue gas leading, and active carbon is filled in the described flue gas leading, outside the steam pipe, and described retracting device also is provided with vavuum pump; Before described desorption portion was divided work, described vavuum pump was evacuated to vacuum with described retracting device.
Preferably, described solvent recovery unit comprises the condenser that is used to cool off desorption and goes out solvent vapo(u)r, the solvent recovery jar that is used to collect cooling back solvent, and described vavuum pump is connected with the solvent recovery jar.
Preferably, described adsorption tanks are provided with Pressure gauge.
Preferably, described pure qi (oxygen) transfer passage is provided with air-introduced machine.
Because the technique scheme utilization, the present invention compared with prior art has advantage and effect:
The present invention realizes through two-way through in same adsorption tanks, adsorbing with desorption; During desorption; Active carbon outside managing is carried out desorption in steam pipework, feeding high-temperature steam under the environment of negative pressure; Active carbon does not directly contact with steam, keep its drying, avoided original directly through water vapour to active carbon carry out desorption make active carbon absorb that adsorption capacity that moisture causes descends and in desorption process water vapour combine the back to discharge the secondary pollution that causes with solvent.Its advantage is following:
(1), energy savings; (2), avoid polluting; (3), reduce cost.
Description of drawings
Accompanying drawing 1 is a structural representation of the present invention;
Accompanying drawing 2 is the structural representation of adsorption tanks of the present invention.
Wherein: 1, adsorption tanks; 2, waste gas transfer passage; 3, pure qi (oxygen) transfer passage; 4, flue gas leading; 5, steam pipe; 6, active carbon; 7, vavuum pump; 8, condenser; 9, solvent recovery jar; 10, Pressure gauge; 11, air-introduced machine; 12, pipeline.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Like the dry method desorption apparatus of Fig. 1, a kind of organic exhaust gas active-carbon absorption shown in 2, it comprises be in parallel a plurality of adsorption tanks 1 that are filled with active carbon 6, the waste gas transfer passage 2 that is used to carry organic exhaust gas, the pure qi (oxygen) transfer passage 3 that is used for delivery of purge gas, the steam raising plant that is used to make high temperature desorption steam that is provided with, the solvent recovery unit that is used to collect the desorption solvent.
Waste gas transfer passage 2, adsorption tanks 1, pure qi (oxygen) transfer passage 3 constitute absorbed portion; Steam raising plant (not shown), adsorption tanks 1, solvent recovery unit constitute the desorption part.Be provided with the flue gas leading 4 of the organic exhaust gas that is used to flow through, the steam pipe 5 of the desorption steam that is used to flow through in the adsorption tanks 1, steam pipe 5 is arranged in the flue gas leading 4, and active carbon 6 is filled in the flue gas leading 4, outside the steam pipe 5.Wherein: solvent recovery unit comprises the condenser 8 that is used to cool off desorption and goes out solvent vapo(u)r, the solvent recovery jar 9 that is used to collect cooling back solvent; Retracting device also is provided with vavuum pump 7, and vavuum pump 7 is connected with solvent recovery jar 9; Adsorption tanks 1 also are provided with Pressure gauge 10, to guarantee when working the pressure reading in the adsorption tanks 1; In the present embodiment, be provided with altogether that 1, two adsorption tanks 1 of two adsorption tanks can replace adsorb, desorption.
In addition, pure qi (oxygen) transfer passage 3 is provided with air-introduced machine 11.Each element of whole recovery device is connected through pipeline 12.
Below the concrete method of operating of present embodiment down of setting forth:
(1), pending organic exhaust gas is through filtering the filtration of cooling system, filtering bulky grain magazine, and the cooling back that lowers the temperature gets in the waste gas transfer passage 2; Organic exhaust gas gets into through waste gas transfer passage 2 and adsorbs in the adsorption tanks 1 of work, in adsorption tanks 1, and the organic exhaust gas flue gas leading 4 of flowing through; And under the absorption that is filled in active carbon 6 wherein, filtering its comprise such as organic solvent gas such as benzene, alcohol, ketone, fat, can certainly select the better NACF of adsorption function; And under the effect of air-introduced machine 11; Discharge recovery system from pure qi (oxygen) transfer passage 3, in the adsorption process, the pressure of whole recovery device is malleation;
(2), after active carbon 6 absorption certain amount of solvent, carry out desorption work, before desorption; Through vavuum pump 7 recovery system is evacuated to vacuum, after being in subnormal ambient, carries out desorption through Pressure gauge 10 affirmation systems; Use steam raising plant to produce the high-temperature steam that temperature is 115~125 degree, when vapor (steam) temperature at 120 Du Shiyoujia, vapor stream is through steam pipe 5 and conduct heat to active carbon 6; The solvent of absorption in the active carbon 6 is steamed, be delivered to solvent recovery unit through pipeline 12;
(3), solvent vapo(u)r cools off in the condenser 8 of solvent recovery unit, is kept in the solvent recovery jar 9 after becoming organic solution after the cooling, carries out other utilization.
In the present embodiment; After 6 absorption of the active carbon of adsorption tanks 1 were saturated, its desorption partly carried out work, when vavuum pump 7 will wherein gas be evacuated to vacuum; Little of gas can get into the absorbed portion of another one adsorption tanks 1 ', makes it still can carry out absorption work.
Like this, in the whole desorption process, high-temperature steam does not have directly and contacts with active carbon, and active carbon remains drying, also can not influence its absorption property owing to drying is insufficient behind the desorption, has improved the service life and the adsorption efficiency of active carbon; Simultaneously, also avoided in desorption process water vapour and solvent to combine the back discharging and the secondary pollution that causes.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.