The content of the invention
It is existing to overcome it is a primary object of the present invention to provide the absorption processing method and system of a kind of VOC organic exhaust gasThere is the deficiency in technology.
To realize aforementioned invention purpose, the technical solution adopted by the present invention includes：
The embodiments of the invention provide a kind of absorption processing method of VOC organic exhaust gas, it includes：
(1) VOC organic exhaust gas is fully contacted in absorption plant with absorbent, made in the organic exhaust gas at least partlyOrganic matter is absorbed by absorbent and forms absorbent rich solution, the outside discharge if up to standard of the waste gas after purification；
(2) the absorbent rich solution is made to enter in desorption apparatus through vacuum extraction or heated separation or inverse with purge gasTo contact, the organic matter in the absorbent rich solution is desorbed, obtain the absorbent lean solution of regeneration, be enriched with the solution of organic matterAir-breathing body carries out condensing recovery or burning or oxidation processes；
(3) the absorbent lean solution for the regeneration for being obtained step (2) inputs the absorption plant and recycled.
As one of case is preferable to carry out, step (1) also includes：It is right before VOC organic exhaust gas is inputted into absorption plantVOC organic exhaust gas cools down processing, and condensed unit condenses, and is separated and recovered from the VOC organic exhaust gas extremelySmall part organic matter.
The embodiment of the present invention additionally provides a kind of absorption processing system of VOC organic exhaust gas, and it includes：
Absorption plant, to make VOC organic exhaust gas fully be contacted with absorbent, so that at least part in organic exhaust gasVOC organic matters are absorbed by absorbent, obtain the waste gas after absorbent rich solution and purification；And
Desorption apparatus, to make the absorbent rich solution of absorption plant output through vacuum extraction it is heat-treated or withPurge gas inversely contacts, so that the organic matter in the absorbent rich solution desorbs, obtains the absorbent lean solution and richness of regenerationCollect the desorption gas of organic matter.
In certain embodiments, the absorption processing system also includes condensation recovery unit, the condensation recovery unit bagCondensing heat exchanger is included, at least VOC organic exhaust gas to be cooled, and makes at least part in the VOC organic exhaust gas after coolingOrganic matter is condensed into liquid or solid-state, and exports the waste gas after condensed processing.
Compared with prior art, advantages of the present invention includes：
(1) present invention is first to condense the larger organic constituentses of the value in recovery unit recovery VOC organic exhaust gas, afterwardsAgain to absorb and desorb processing VOC organic exhaust gas, so as to realize to the further efficient absorption of VOC organic exhaust gas and removing, makeWaste gas qualified discharge, and can also realize the efficient desorption of absorbent so that absorbent can be recycled, and substantially reduce operationCost, and realize the further recovery of volatile organic matter；
(2) the absorption processing method of VOC organic exhaust gas provided by the invention is simple to operate, and absorbent and purge gas etc. canTo recycle online, thus the lasting place to VOC organic exhaust gas can be realized on the basis of significantly absorbent dosage is reducedReason, and make waste gas qualified discharge, cost is low, green；
(3) the provided by the invention a kind of and supporting system space-consuming of VOC organic exhaust gas absorption processing methodSmall, energy consumption is low, and may be designed as the portable structure of skid, more conducively the leakage onsite application in some pernicious gases.
Embodiment
In view of deficiency of the prior art, inventor is able to propose the present invention's through studying for a long period of time and largely putting into practiceTechnical scheme, it is mainly the absorption processing method and its system of a kind of VOC organic exhaust gas.As follows will to the technical scheme, itsImplementation process and principle etc. are further explained.
A kind of absorption processing method for VOC organic exhaust gas that the one side of the embodiment of the present invention provides includes：
(1) VOC organic exhaust gas is fully contacted in absorption plant with absorbent, made in the organic exhaust gas at least partlyOrganic matter is absorbed by absorbent and forms absorbent rich solution (as follows can abbreviation rich solution), the outside row if up to standard of the waste gas after purificationPut；
(2) the absorbent rich solution is made to enter in desorption apparatus through vacuum extraction or heated separation or inverse with purge gasTo contact, the organic matter in the absorbent rich solution is desorbed, obtain the absorbent lean solution (as follows can abbreviation lean solution) of regeneration, it is richThe desorption gas of collection organic matter carries out condensing recovery or burning or oxidation processes；
(3) the absorbent lean solution for the regeneration for being obtained step (2) inputs the absorption plant and recycled.
As one of case is preferable to carry out, step (1) also includes：It is right before VOC organic exhaust gas is inputted into absorption plantVOC organic exhaust gas cools down processing, and condensed unit condenses, and is separated and recovered from the VOC organic exhaust gas extremelySmall part organic matter.
In the present invention, described VOC organic exhaust gas refers to containing volatile organic matter (Volatile OrganicCompounds, abbreviation VOC) waste gas.The volatile organic matter includes volatile hydrocarbon and their derivative,Such as include hydro carbons, aromatic hydrocarbons, alcohols, aldehydes, ketone, lipid, amine, organic acid etc..Certainly, the VOC organic exhaust gasOther organic matters can be contained.
In some preferred embodiments, abovementioned steps (1) include：VOC organic exhaust gas is cooled, and condensed listAt least part organic matter (including but is not limited to foregoing volatile organic matter) in the waste gas is reclaimed in member condensation.The step(1) method of processing VOC organic exhaust gas has the features such as simple to operate, flow is short, strong applicability, and selectivity is flexible in, can be realThe synchronization of existing multiple pollutant, expeditiously remove, and energy consumption is low, non-secondary pollution, can also obtain the pair with recovery valueProduct.
Further, step (1) specifically includes：Organic exhaust gas after condensed processing and absorbent are inputted into absorption respectivelyThe gas access and liquid inlet of device, the organic exhaust gas is set fully to be contacted in absorption plant with absorbent, so that instituteAt least part organic matter stated in organic exhaust gas is absorbed by absorbent, organic exhaust gas and absorbent rich solution after being purified, itThe organic exhaust gas after purification is exported from the gas vent of the absorption plant afterwards, and, by absorbent rich solution from the absorptionThe liquid outlet output of device.
Prior absorbent device can be supergravity reactor or the packed tower or spray column of routine, preferably surpassGravity absorber.
For example, in certain embodiments, abovementioned steps (1) can specifically include：By the VOC organic wastes after condensed processingGas inputs the gas access and liquid inlet of the hypergravity absorber with absorbent respectively, makes the organic exhaust gas and absorbentBecause hypergravity acts on fully contact in hypergravity absorber, so that at least part organic matter (bag in the organic exhaust gasInclude but be not limited to foregoing volatile organic matter) absorbed by absorbent, organic exhaust gas and absorbent rich solution after being purified,The organic exhaust gas after purification is exported from the gas vent of the hypergravity absorber afterwards, and by absorbent rich solution from describedThe liquid outlet output of hypergravity absorber.
In some preferred embodiments, abovementioned steps (1) may also include：In the gas vent of the hypergravity absorberPlace is detected to the waste gas after purification, if detect it is qualified if be discharged into air, it is on the contrary then re-enter the hypergravity absorberGas access.
Further, step (2) specifically includes：The absorbent rich solution is inputted into desorption apparatus, and to absorbent rich solutionVacuum extraction is carried out, either absorbent rich solution is heated or makes absorbent rich solution and the purge gas that is passed through desorption apparatus is inverseTo contact, so that the organic matter desorption in absorbent rich solution, obtains the absorbent lean solution of regeneration and is enriched with the solution of organic matterAir-breathing body.
Foregoing desorption apparatus can be packed tower or the absorption tower of supergravity reactor or routine, preferably superGravity desorption device.
For example, in some preferred embodiment, abovementioned steps (2) specifically may include：The absorbent rich solution is inputted into instituteThe liquid inlet of hypergravity desorption device is stated, or vacuum system is connected in hypergravity desorption device, or absorbent rich solution is heated, orPurge gas inversely is passed through, makes the absorbent rich solution that Desorption separation occur in hypergravity desorption device, so that absorbent is richOrganic matter desorption in liquid, obtain the absorbent lean solution of regeneration, and the desorption gas of enrichment organic matter.
Further, step (3) specifically includes：The cooling of the desorption gas rich in organic matter that step (2) is obtained is coldSolidifying recovery at least part organic matter therein, or, system is burned into the input of the desorption gas rich in organic matter that step (2) is obtainedSystem or oxidization processing system.
For example, in some preferred embodiment, abovementioned steps (3) can specifically include：The absorbent that step (2) is obtainedThe liquid inlet of lean solution input hypergravity absorber and recycling, and the desorption rich in organic matter that step (2) is obtainedGas, then organic matter therein is reclaimed by cooling condensation, or, it is delivered to burning or oxidization processing system.
Further, abovementioned steps (3) may also include：By through cooling condensation recycling after desorption gas return transport to it is superThe gas access of gravity desorption device and recycle.
Foregoing supergravity reactor can be RPB, deflector type hypergravity rotating device, helical duct hypergravityAny one or more in rotating device, fixed-rotor hypergravity rotating device and rotating compact disc hypergravity rotating device.
In some preferred embodiment, in the absorption processing method of described VOC organic exhaust gas, the hypergravity reactionThe hypergravity level of device should be enough to enable the absorbent fully to contact with VOC organic exhaust gas or make purge gas and rich solution enoughFully it is advisable, for example, in some preferred embodiments, the rotor speed of the hypergravity absorber or hypergravity desorption device canThink 200~1500rpm.
Further, be selected from being capable of reversible adsorption step (1) separation obtains for physically gas phase for the absorbentThe absorbent of organic matter (including but is not limited to foregoing volatile organic matter) in system.The absorbent is preferably flow-like, particularly liquid.
Wherein, described absorbent (can include but is not limited to foregoing according to contained organic matter in the VOC organic exhaust gasVolatile organic matter) type, content etc. and choose and assemble from any suitable sorbent known to industry.
Further, in the absorption processing method of the VOC organic exhaust gas, the temperature conditionss in the absorption plant are excellentElecting as can make aforesaid organic substances (including but is not limited to foregoing volatile organic matter) farthest be dissolved in the absorbent,Temperature conditionss without causing the absorbent rotten (thing phase and chemical constitution change).
In some embodiments, described absorbent may be selected from water, oily substance (such as lubricating oil, diesel oil, keroseneDeng), ionic liquid or any of its compound, the aqueous solution or microemulsion containing surfactant or a variety of combinations, but notIt is limited to this.
Further, be selected from being capable of reversible absorption step (1) separation obtains for physically gas for the purge gasVolatile organic matter in phase system, and will not be with the gas of the sorbent reactions.
In some embodiments, the purge gas preferably from but be not limited to vapor, air, nitrogen, indifferent gasAny of body or two or more combinations.
More preferable, the temperature for inputting the purge gas of the desorption apparatus is not less than normal temperature.
It is of the invention to be first worth larger organic constituentses, Zhi Houzai to condense in recovery unit recovery VOC organic exhaust gasAbsorb and desorption handles VOC organic exhaust gas, so as to realize to the further efficient absorption of VOC organic exhaust gas and removing, make waste gasQualified discharge, and can also realize the efficient desorption of absorbent so that absorbent can be recycled, substantially reduce operation intoThis, and realize the further recovery of volatile organic matter.
The absorption processing system for the VOC organic exhaust gas that the other side of the embodiment of the present invention provides, including：
Absorption plant, to make VOC organic exhaust gas fully be contacted with absorbent, so that at least part in organic exhaust gasVOC organic matters are absorbed by absorbent, obtain the waste gas after absorbent rich solution and purification；And
Desorption apparatus, to make the evacuated processing of the absorbent rich solution of absorption plant output or it is heat-treated orInversely contacted with purge gas so that in the absorbent rich solution organic matter desorption, obtain regeneration absorbent lean solution andIt is enriched with the desorption gas of organic matter.
In some embodiments, the absorption processing system of described VOC organic exhaust gas includes condensation recovery unit, describedCondensation recovery unit includes condensing heat exchanger, at least VOC organic exhaust gas to be cooled, and makes the VOC organic wastes after coolingAt least part organic matter in gas is condensed into liquid or solid-state, and exports the waste gas after condensed processing.
In some more specific embodiment, the absorption processing system includes：
Recovery unit is condensed, including：
Condensing heat exchanger, at least VOC organic exhaust gas and/or purge gas containing organic matter to be exchanged heat cooling, makeVOC organic exhaust gas at least part organic matters after cooling are condensed into liquid or solid-state, and export the organic waste after condensed processingGas, and
Collector unit, at least being collected in the liquid formed in the condensing heat exchanger or solid organic.
Prior absorbent device includes any one in supergravity reactor, packed tower and spray column, preferably hypergravityAbsorber.
Foregoing desorption apparatus includes any one in supergravity reactor, packed tower and absorption tower, preferably hypergravityDesorption device.
For example, in some preferable case study on implementation, the absorption processing system includes：
Hypergravity absorber, to make organic exhaust gas and absorbent that condensation recovery unit exports, condensed processing becauseHypergravity effect fully contact, so that at least part VOC organic matters in organic exhaust gas are absorbed by absorbent, obtains absorbentOrganic exhaust gas after rich solution and purification；And
Hypergravity desorption device, to make the absorbent rich solution of the hypergravity absorber output through vacuum system or heatedSeparation inversely contacts desorption with purge gas, so that the organic matter in the absorbent rich solution is isolated, obtains regenerationThe desorption gas of absorbent lean solution and enrichment organic matter.
Further, the hypergravity absorber at least has the gas for the organic exhaust gas for being available for inputting the condensed processingBody entrance, it is available for inputting the liquid inlet of the absorbent, is available for exporting the gas vent of the organic exhaust gas after purifying and is available forThe liquid outlet of the absorbent rich solution is exported, the hypergravity desorption device, which at least has, is available for vacuum system interface or input to blowThe gas access of scavenging body, it is available for inputting the liquid inlet of the absorbent rich solution, is available for the absorbent lean solution that output regeneratesLiquid outlet and be available for output rich in organic matter desorption gas gas vent, the liquid inlet of the hypergravity absorber andLiquid outlet connects with the liquid outlet of the hypergravity desorption device and liquid inlet respectively, the gas of the hypergravity desorption deviceExport and be interconnected with the VOC organic exhaust gas entrances of the condensation recovery unit.
By the design, the envelope of the absorbent can be formed between the hypergravity absorber and hypergravity desorption deviceClosed loop loop.
Further, the hypergravity absorber and hypergravity desorption device may be selected from foregoing supergravity reactor, andIts running parameter etc. also can be as mentioned before.
In some embodiments, in the desorption apparatus and vacuum system, heater, purge gas feed systemAt least one connection, nationality to absorbent rich solution in desorption apparatus to carry out vacuum extraction, heating or purging.Wherein, heating dressPutting to be located in the desorption apparatus, can also be located at outside desorption apparatus.
In some embodiments, the desorption gas outlet of the desorption apparatus is also with condensing recovery unit, CIUOr at least one of oxidation processes connection, nationality with reclaim enrichment organic matter desorption gas in organic matter or by burningThe mode organics removals such as burning, oxidation, and avoid the pollution to the external world.
The absorption processing system of the VOC organic exhaust gas provided by the invention occupies little space, and energy consumption is low, and may be designed asThe portable structure of skid, more conducively the leakage onsite application in some pernicious gases.
Refer to shown in Fig. 1 be a kind of VOC organic exhaust gas in an of the invention exemplary embodiments hypergravity absorption processingThe process chart of method, it includes：
Pending VOC organic exhaust gas is subjected to cooling heat transferring cooling by heat exchanger, then condensed unit cools backThe organic component of at least part higher-value in the VOC organic exhaust gas is received, the VOC organic exhaust gas Jing Guo preliminary purification is defeatedDeliver in hypergravity absorber, fully contacted with the absorbent being passed through and complete absorption process, make in the VOC organic exhaust gasAt least part volatile organic matter is absorbed by absorbent, the tail gas qualified discharge after purification, after absorbing volatile organic matterAbsorbent forms absorbent rich solution；Caused absorbent rich solution is delivered in hypergravity desorption device after absorption process being completed, withThe purge gas of parsing fully contacts, and volatile organic matter is desorbed from the absorbent rich solution, then enters and blowsIn scavenging body, the absorbent lean solution that is regenerated can be delivered in the hypergravity absorber and recycle.And contain volatilityThe desorption gas of organic matter is transported to condensing unit to reclaim volatile organic matter, or can also be delivered to burning disposal systemSystem.
Technical scheme is illustrated in more detail with reference to exemplary embodiments.
In an exemplary embodiment, for the organic exhaust gas of VOC containing valuable higher one-component in chemical processProcessing, organic matter is on the one hand reclaimed as far as possible, while require that the discharge after exhaust-gas efficient absorption or burning disposal reaches correspondingNational standard.Canonical process is as follows：
1) waste gas for containing volatile organic matter (VOC) is condensed through coolings such as heat exchangers and reclaims lime set therein, VOC is denseWaste gas after degree substantially reduces is passed through in high gravity rotating packed bed absorber, with ionic liquid absorbent in packing layer it is reverseContact, the organic component in VOC organic exhaust gas is absorbed by ionic liquid absorbent；Purified gas after efficient absorption is from superGravity machine gas vent exports, outer row or reuse；And the ionic liquid absorbent after wherein organic matter is absorbed from hypergravity machineDraw, into ionic liquid absorbent rich solution；
2) by absorbent rich solution by conveying equipment for fluid substances input hypergravity regenerating unit in, using high-temperature gas (nitrogen/Air) purging carries out desorption and regeneration to rich solution, and the VOC organic matters in rich solution are freed into gas phase；
Regenerate, exported from hypergravity regenerator, be absorbed agent lean solution after rich solution parsing；Absorbent regeneration returns overweightPower absorber recycles；
Regeneration gas after stripping regenerable absorbent organic matter, containing the higher organic matter of concentration, it is transported to VOC organic exhaust gasVOC organic matters therein are reclaimed in porch, again condensation.
Wherein：The ionic liquid absorbent also compounds organic/inorganic solvent.
The ionic liquid absorbent includes：Glyoxaline ion liquid, pyridine ionic liquid.The organic solvent bagInclude：Diesel oil, kerosene, 664 defoamers, propene carbonate, N- N-formyl morpholine Ns.The inorganic solvent includes：Water, sodium citrate, secondSour sodium.
Another embodiment is related to a kind of baking oven hot waste gas in Production Process of Lithium Battery and carries out hypergravity absorption processingTechnique.
Specifically, NMP (N-methyl-2-pyrrolidone, 1-METHYLPYRROLIDONE) is because it is to adhesive PDVFThe advantages that dissolved dilution performance of (Kynoar) is good and generally selected by lithium ion battery, and lithium ion battery production inDischarge the main component in waste gas.If to the NMP in waste gas without recycle, not only result in serious environmental pollution,But also a large amount of wastes of raw material can be caused.
By taking the lithium battery production technology of certain lithium battery production firm as an example, the baking oven heat in its Production Process of Lithium Battery is uselessIn gas (following abbreviation waste gas), NMP initial content is more than 2000ppm.First by the waste gas through thermal energy exchange in the present embodimentSystem reclaims heat, reduces its temperature, and its temperature is reduced into 20 DEG C through cooling down condenser system, reclaims condensation thereinLiquid, NMP contents in waste gas is reduced to 300~600ppm, the waste gas through preliminary purification is sent into hypergravity time through discharging the mouth of pipeProcessing system is received, is existed with absorption water-NMP mixed solutions (startup absorbing liquid is water) being conveyed through circulating pump, coming from storage tankFully contacted in hypergravity machine, because of NMP and water infinitely dissolve, so as to reach waste gas purification effect, discharge waste gas NMP contents ＜6ppm。
Waste gas cleaning system absorbing liquid in the present embodiment is water, is automatically controlled according to NMP contents in absorbing liquid, realWhen supplement process water.After the NMP concentration in absorbing liquid circulating storage groove reaches 20%, product liquid storage tank is delivered to outside, in this way, big absolutelyPartial NMP is reclaimed, and reduces operating cost.
In the present embodiment, process water is used as absorbent, it is cheap, regeneration expense can be reduced without regeneration, simultaneouslyThe NMP aqueous solution after absorption can obtain useful nmp solvent through rectifying column concentration and recovery.But need to consider absorptionThe concentration and dosage of the NMP aqueous solution, to reduce the energy consumption of later stage concentration.
It should be appreciated that described above is only the preferred embodiment of the present invention, for the ordinary skill people of the artFor member, without departing from the technical principles of the invention, some improvements and modifications can also be made, these improvements and modificationsAlso it should be regarded as protection scope of the present invention.