CN105771543A - Dry purification and recovery device of organic waste gas - Google Patents
Dry purification and recovery device of organic waste gas Download PDFInfo
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- CN105771543A CN105771543A CN201610255631.7A CN201610255631A CN105771543A CN 105771543 A CN105771543 A CN 105771543A CN 201610255631 A CN201610255631 A CN 201610255631A CN 105771543 A CN105771543 A CN 105771543A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/02—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
- B01D53/0407—Constructional details of adsorbing systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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Abstract
The invention relates to a dry purification and recovery device of organic waste gas. The dry purification and recovery device comprises an adsorption system, a desorption system and a condensation recovery system, wherein the adsorption system comprises at least two absorbers arranged in parallel; the desorption system comprises a circulating fan, a heater and a nitrogen filling device; the condensation recovery system comprises multiple stages of condensers connected in series in sequence and a suction fan; the gas inlet end of the first stage of condenser is connected with the gas outlet end of the circulating fan; the gas outlet end of the final stage of condenser is connected with the gas inlet end of the suction fan; the gas outlet end of the suction fan is connected with the gas inlet end of the first stage of condenser; the gas outlet end of the first stage of condenser is connected with the gas inlet end of the heater; a control valve V15 and a control valve V16 are arranged at the gas inlet end and the gas outlet end of the first stage of condenser respectively; a control valve VF2 is also arranged on a pipeline by which the suction fan is connected with the first stage of condenser. The dry purification and recovery device provided by the invention can realize high efficiency and low energy consumption of organic waste gas purification and recovery, thereby having significant economic benefits and environmental protection benefits.
Description
Technical field
The present invention relates to the purification of organic exhaust gas and recovery, specifically, relate to the dry cleaning recovery device about organic exhaust gas, belong to technical field of air pollution control.
Background technology
The organic exhaust gas that organic solvent in use evaporates, not only creates huge harm, and causes the great wasting of resources environmental and human health impacts.Carry out the recovery of organic solvent from organic water gas cost-effectively and recycle, advantageously reducing production cost on the one hand, produce economic benefit, environmental pollution can be reduced again on the other hand, be the important step of enterprise clean production.From the angle of life cycle analysis, organic solvent reclaims also can greatly reduce the resource of solvent production process, energy resource consumption and environmental pollution, reduce greenhouse gas emission, for promoting the development of recycling economy and setting up the society of sustainable development and be significant, under the situation strengthening energy-saving and emission-reduction work further of conscientiouslying implement in current China, have more realistic meaning.
In prior art, the purification treatment technology about organic exhaust gas includes separating and convert purification two broad aspect, carries out converting purification again and use to save handling after also passing through separation concentration when much reclaiming or recovery value is only small.The methods such as burning in VOCs treatment technology, catalyzed conversion and biological cleaning belong to convert purification process.In most of the cases, except bioanalysis, the operating cost of other treatment technology is higher, and bioanalysis is generally relatively low at pollutant burden, and pollutant biochemical purifies occasion preferably could better play the advantage of its economy.
The methods such as employing membrance separation, absorption, condensation, absorption that are presently mainly about the Recovery Purifying of organic exhaust gas carry out, but membrance separation needs to operate under elevated pressure conditions, current gaseous jet simulation material is also in the stage of development, industrial applications also has many basic research job demand to carry out, and is extremely difficult to the technology maturity of heavy industrialization application in a short time；Absorption process mainly adopts other liquid organic solvent that gas is carried out absorption cleaning, it is easily separated again through modes such as rectification, absorbent is in recycling process, there is rotten and secondary pollution problem in most cases, restrictive condition is many, use scope is restricted, and popularization is not strong, is only suitable for being applied to some specific occasions；Condensation method is often the organic final means of gas recovery, but is primarily adapted for use in the occasion of little air quantity, high concentration, and the follow-up supporting technology usually used as some gas concentration technology uses.Numerous bases Technological research data shows, active carbon adsorption is the most economical and effective method that industrial waste gas is carried out environment protection treating and recovery.It is an enrichment method technology in essence because of adsorption process, activated carbon adsorption is dependent on physics and the chemisorption of activated carbon internal capillary, Adsorption of Organic in waste gas is got off, thus reaching to purify the purpose of waste gas, owing to Organic substance is not really converted into innocuous substance by the absorption of simple activity charcoal, and it is adsorbed onto and to a certain degree can reach capacity, therefore generally have to carry out desorption and regeneration to realize the organic recovery adsorbed.
Currently; the desorption and regeneration technology that active carbon adsorption is conventional mainly has: 1. low pressure water vapor desorbing+condensation recovery technology; 2. the intensification desorbing+condensation recovery technology under inert gas shielding bad border; 3. hot-air intensification desorbing+condensation recovery technology; 4. vacuum or vacuum aided heating desorption+condensation recovery technology, 5. second adsorption recovery technology etc.；Owing to water vapor desorption is wet reclamation technology, there is following several inevitable problem: (1) steam heat is delivered to from outward in adsorbent pores road, and adsorbent thermal conductivity coefficient is little, heat transfer rate is slow, and desorption time is long；(2) length dry, cool time, energy consumption are big, and impact is adsorbed next time；(3) condensed water causes secondary pollution；(4) reclaim Organic substance moisture content high, increase subsequent technology separation costs；(5) equipment corrosion is serious；(6) for there is certain water solublity and being prone to the Organic substance of hydrolysis, as: ethyl acetate, toluene, water pollution problems and the purification problem of regenerant that employing the method produces are just especially prominent, research shows: the product of ethyl acetate steam desorption will produce solvent phase and aqueous phase, solvent mutually in often contain more than 2% water, and containing the solvent of about 8% in aqueous phase, the amount of aqueous phase is usually more than 3-5 times of quantity of solvent, and it is prone to hydrolysis, ethyl acetate again easily with the azeotropic mixture of water generation different proportion, common rectification is made to be difficulty with the separation of water and ethyl acetate, reduce value and the economic worth of this kind solvent reclaimed.
For the drawbacks described above overcoming steam to regenerate, new regeneration techniques is constantly developed, such as: the technology such as micro wave regeneration, electro-thermal regeneration and thermal current regeneration, owing to micro wave regeneration technology exists heating inhomogeneities, it is easy to form focus at activated carbon surface, cause the danger of burning, additionally, in microwave heating process can there is water gas reaction in hydrone and charcoal molecule, causes activated carbon weight to lose, and these technological deficiencies cause that microwave current regeneration techniques never has big commercial application；Although electrothermal desorption regeneration techniques can overcome the defect that microwave heating is uneven, but high boiling point organic molecule desorption rate is slower, and can cause under high temperature that some adsorb active organic molecule and produce chemical change, coking and polymerization occur, causes the defect problems such as activated carbon poisoning and deactivation；Therefore, the mainly thermal current regeneration techniques of current industrialization research, utilize hot nitrogen to make the at high temperature desorption of the organic molecule in activated carbon as thermal medium, although hot nitrogen avoids steam and introduces, but desorption temperature is higher, binding molecule recurring structure is still easily made to change, even coking；It addition, nitrogen is incoagulable gas, the high concentration organic gas condensing response rate of desorption is low, and energy consumption is high；Especially, current hot nitrogen desorption recovery technology (such as: Chinese patent application CN201310412976.5) is to be circulated condensation at main line, not only energy consumption is very big, it is crucial that in circular regeneration process, lower boiling Organic substance is constantly had to be condensate in circulation line or equipment, cause that desorption efficiency is low, desorption stroke is long, the response rate is low, in removal process, organic solvent is rotten serious, pipeline and equipment are perishable, many defect problems such as adsorbent service life is short, and it is easily generated potential safety hazard, the double requirements of economic benefit and environmental benefit can not be met.
Summary of the invention
The problems referred to above existed for prior art and social need, it is an object of the invention to provide a kind of economic benefit and the dry cleaning recovery device of all significant organic exhaust gas of environmental benefit.
For achieving the above object, the present invention adopts the following technical scheme that
The dry cleaning recovery device of organic exhaust gas of the present invention, including adsorption system, desorption system and condensate recovery system, described adsorption system includes at least 2 adsorbers being arranged in parallel, described desorption system includes circulating fan, heater and nitrogen charging device, control valve it is provided with respectively in inlet end and the outlet side of each adsorber, and the inlet end of all adsorbers is attempted by the inlet end of circulating fan, the outlet side of all adsorbers is attempted by the outlet side of nitrogen charging device, the pipeline that the inlet end of all adsorbers is connected with the inlet end of circulating fan is respectively equipped with control valve, the pipeline that the outlet side of all adsorbers is connected with the outlet side of nitrogen charging device is respectively equipped with control valve, described heater is serially connected between circulating fan and nitrogen charging device；It is characterized in that: described condensate recovery system includes the multi-stage condensing device and the suction fan that are sequentially connected in series, the inlet end of chopped-off head condenser therein is connected with the outlet side of circulating fan, the outlet side of last condenser stage is connected with the inlet end of suction fan, the outlet side of suction fan is connected with the inlet end of chopped-off head condenser again, and the outlet side of chopped-off head condenser is connected with the inlet end of heater；Further, it is respectively equipped with control valve in inlet end and the outlet side of chopped-off head condenser, the pipeline that suction fan is connected with chopped-off head condenser also is provided with control valve.
Preferably, described multi-stage condensing device divides three grades, and chopped-off head is air cooler, and secondary is cooling water condensation device, and final stage is chilled water condenser, and cooling water condensation device is all connected with solvent recovery container with chilled water condenser；Take fractional condensaion, can energy efficient, improve the response rate.
Preferably, also include purifying adsorber, the described inlet end of purification adsorber is connected with the outlet side of suction fan, the outlet side of described purification adsorber is connected with the inlet end of chopped-off head condenser, and it is respectively equipped with control valve in inlet end and the outlet side of described purification adsorber, to realize remnants not condensate is absorbed, nitrogen purge gas, meet the prescription of nitrogen circulation recycling.
As it is preferred that scheme, the inlet end of described purification adsorber is also connected with the outlet side of nitrogen charging device, the outlet side of described purification adsorber is also connected with the inlet end of circulating fan, and purifying on the pipeline that adsorber is connected with circulating fan and purifying, the pipeline that adsorber is connected with nitrogen charging device is respectively equipped with control valve, to realize purification adsorber is carried out desorption and regeneration.
Preferably, the outlet side of described heater and the outlet side of nitrogen charging device are attempted by the outlet side of each adsorber, and are also respectively equipped with control valve at the inlet end of heater and the outlet side of nitrogen charging device.
As it is preferred that scheme, being also serially connected with cooler between circulating fan and nitrogen charging device, described cooler is connected in parallel on the pipeline that circulating fan is connected with nitrogen charging device with heater, and the inlet end of cooler is provided with control valve.
Preferably, also include conveying gas blower, the outlet side of described conveying gas blower and and the adsorber air inlet end that connects between be serially connected with waste gas pre-treating device.
As it is preferred that scheme, the outlet side of described waste gas pre-treating device is also connected with the inlet end of circulating fan, and is provided with control valve on the pipeline being connected.
As it is preferred that scheme, described waste gas pre-treating device is provided with filtering module and temperature-regulating module.
Preferably, described adsorber is active carbon adsorber.
Compared with prior art, the present invention has following significance beneficial effect:
The present invention is by arranging bleed blower fan, the formation condensation internal recycle of giving vent to anger making circulating fan carries out solvent recovery, thus avoid prior art to be circulated at whole main line that the existing energy consumption of condensation is big, easily accumulate solvent in circulation line or equipment causes the problem of pipeline and equipment corrosion and potential safety hazard, and desorption heating is easily caused the problem that solvent is rotten；Especially, it is dry method because apparatus of the present invention realize the process of desorption and regeneration, therefore not only there is no secondary pollution, and the water content in institute's recovered solvent is less than 0.05%, solvent recovering rate is up to more than 90%, purification efficiency is more than 95%, relative to technology described in Chinese patent application CN201310412976.5, energy consumption can save more than 20%, the service life of adsorbent can be extended to more than 36 months by existing 24 months, can be widely applied to oil, chemical industry, medicine, application, the Recovery Purifying of the organic exhaust gas discharged in the industries such as printing, relative to prior art, there is significant economic benefit and environmental benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the dry cleaning recovery device of a kind of organic exhaust gas provided by the invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, technical solution of the present invention is described in further detail and completely.
Embodiment 1
nullAs shown in Figure 1: the dry cleaning recovery device of a kind of organic exhaust gas provided by the invention，Including adsorption system、Desorption system and condensate recovery system，Described adsorption system includes at least 2 adsorbers being arranged in parallel and (in figure is 3，Respectively adsorber 1、2、3)，Described desorption system includes circulating fan 4、Heater 5 and nitrogen charging device 6，Inlet end at each adsorber is respectively equipped with control valve V1、V2、V3，Control valve V4 it is respectively equipped with in outlet side、V5、V6，And the inlet end of all adsorbers is attempted by the inlet end of circulating fan 4，The outlet side of all adsorbers is attempted by the outlet side of nitrogen charging device 6，The pipeline that the inlet end of all adsorbers is connected with the inlet end of circulating fan 4 is respectively equipped with control valve V7、V8、V9，The pipeline that the outlet side of the outlet side of all adsorbers with nitrogen charging device 6 is connected is respectively equipped with control valve V10、V11、V12，Described heater 5 is serially connected between circulating fan 4 and nitrogen charging device 6；The multi-stage condensing device that described condensate recovery system includes being sequentially connected in series (in figure is three grades, it is followed successively by chopped-off head condenser 7, secondary condenser 8 and last condenser stage 9) and suction fan 10, the inlet end of chopped-off head condenser 7 therein is connected with the outlet side of circulating fan 4, the outlet side of last condenser stage 9 is connected with the inlet end of suction fan 10, the outlet side of suction fan 10 is connected with the inlet end of chopped-off head condenser 7 again, and the outlet side of chopped-off head condenser 7 is connected with the inlet end of heater 5；Further, it is respectively equipped with control valve V15, V16 in inlet end and the outlet side of chopped-off head condenser 7, the pipeline that suction fan 10 is connected with chopped-off head condenser 7 also is provided with control valve VF2.
Preferably:
Described device also includes purifying adsorber 11, the inlet end of described purification adsorber 11 is connected with the outlet side of suction fan 10, the outlet side of described purification adsorber 11 is connected with the inlet end of chopped-off head condenser 7, and it is respectively equipped with control valve VF1, VF3 in inlet end and the outlet side of described purification adsorber 11, to realize remnants not condensate is absorbed, nitrogen purge gas, meets the prescription of nitrogen circulation recycling.The inlet end of described purification adsorber 11 is also connected with the outlet side of nitrogen charging device 6, the outlet side of described purification adsorber 11 is also connected with the inlet end of circulating fan 4, and purifying on the pipeline that adsorber 11 is connected with circulating fan 4 and purifying, the pipeline that adsorber 11 is connected with nitrogen charging device 6 is respectively equipped with control valve V13, V14, to realize purification adsorber 11 is carried out desorption and regeneration.
The outlet side of described heater 5 and the outlet side of nitrogen charging device 6 are attempted by the outlet side of each adsorber, and are also respectively equipped with control valve V17, VB1 at the inlet end of heater 5 and the outlet side of nitrogen charging device 6.
Also being serially connected with cooler 12 between circulating fan 4 and nitrogen charging device 6, described cooler 12 is connected in parallel on the pipeline that circulating fan 4 is connected with nitrogen charging device 6 with heater 5, and the inlet end of cooler 12 is provided with control valve V18.
Described device also includes conveying gas blower 13, the outlet side of described conveying gas blower 13 and and the adsorber air inlet end that connects between be serially connected with waste gas pre-treating device 14, described waste gas pre-treating device 14 is provided with filtering module 141 and temperature-regulating module 142, the outlet side of described waste gas pre-treating device 14 is also connected with the inlet end of circulating fan 4, and is provided with control valve VB2 on the pipeline being connected.
Described chopped-off head condenser 7 is air cooler, secondary condenser 8 is cooling water condensation device, and last condenser stage 9 is chilled water condenser, and described cooling water condensation device is all connected with solvent recovery container with chilled water condenser；By taking fractional condensaion, can energy efficient, improve solvent recovering rate.
Described adsorber is active carbon adsorber, has that cost is low, adsorption advantages of higher.
The technique that device of the present invention carries out organic exhaust gas dry cleaning recovery is adopted to include following process:
A) absorption
Shown in Figure 1: to open and be positioned at controlling valve V1, V2, V3 and being positioned at control valve V4, V5, V6 of adsorber 1,2,3 outlet side of adsorber 1,2,3 inlet end, close all the other and control valve, organic exhaust gas will be sent into waste gas pre-treating device 14 by conveying gas blower 13, adsorber is sent into after the filtration and homoiothermic of waste gas pre-treating device 14, adsorbent in the adsorbed device of Organic substance in waste gas adsorbs, and the waste gas after purified discharges.
B) desorption reclaims
nullAssume that No. 3 adsorbers have adsorbed saturated，And No. 1 adsorber is or/and No. 2 adsorbers are still in absorption work，Now need No. 3 adsorbers are carried out desorption and regeneration，Then it is first shut off being positioned at control valve V3 and the V6 of No. 3 adsorber air inlet ends and outlet side，Open control valve VB1 simultaneously、VB2 and V9，By nitrogen charging device 6 to No. 3 adsorber inflated with nitrogen，With the partial oxidation driven away in adsorber in gas phase and steam，The gas being purged is discharged after carrying out again adsorption cleaning in the adsorber of absorption work through V9 and VB2，When the oxygen content in adsorber is lower than setting value，Closing control valve VB1 and VB2，Open circulating fan 4 simultaneously、Control valve 17 and heater 5 and control valve 12，The nitrogen of circulation is heated，When in adsorber, temperature begins to ramp up，Open control valve V15、V16、Condensers at different levels、Suction fan 10 and control valve VF2，To be attracted in the condensation internal recycle formed by condensers at different levels and suction fan 10 by the organic gas of hot nitrogen desorption，Realize that lower boiling organic gas carries out condensation to reclaim，Then the nitrogen making discharge again passes by the heating of heater 5 and is admitted in adsorber，The organic gas making higher is gasified，It is attracted to by suction fan 10 in the condensation internal recycle formed by condensers at different levels and suction fan 10 again and carries out condensation recovery，Circulate operation according to this，Realize desorption and the recovery of organic gas.
C) absorption is purified
When the gas of circulation is on-condensible gas, that is: when not had condensing solvent to produce, closing control valve VF2 and V17, open control valve VF1, VF3 and V18, the gas of circulation is made to send in adsorber after the cooling of subcooler 12 after purifying the adsorption cleaning of adsorber 11, move in circles, until the temperature in adsorber drops to adsorbable operating temperature, it is then shut off controlling valve V9 and V12, this adsorber is in duty upon adsorption, and the nitrogen of purification can be used for the desorption of next adsorber or purifies the desorption of adsorber.
D) desorption of adsorber is purified
nullIf purifying adsorber 11 and having adsorbed saturated，And the nitrogen after utilizing step c) to purify carries out purifying the desorption of adsorber 11，Then closing control valve VF1、VF3 and V18，Open V13、V14 and V17，Hot nitrogen is sent into purifying adsorber 11，When the temperature purified in adsorber 11 begins to ramp up，Open control valve V15、V16、Condensers at different levels、Suction fan 10 and control valve VF2，To be attracted in the condensation internal recycle formed by condensers at different levels and suction fan 10 by the organic gas of hot nitrogen desorption，Realize that lower boiling organic gas carries out condensation to reclaim，Then the nitrogen making discharge again passes by the heating of heater 5 and is admitted in purification adsorber 11，The organic gas making higher is gasified，It is attracted to by suction fan 10 in the condensation internal recycle formed by condensers at different levels and suction fan 10 again and carries out condensation recovery，Circulate operation according to this，Realize purifying desorption and the recovery of organic gas in adsorber 11.
Application examples
The organic solvent that plastics package is done in the organic exhaust gas of multiple production line discharge is mainly ethyl acetate, and ethyl acetate is prone to hydrolysis and easy and water generation different proportion azeotropic mixture, according to existing wet method desorption, not only can produce to condense waste water in a large number, produce secondary pollution, it is crucial that containing the water of more than 2% in the ethyl acetate solvent reclaimed, and containing the ethyl acetate solvent of about 8% in aqueous phase, the amount of aqueous phase is usually more than 3-5 times of quantity of solvent, common rectification is made to be difficulty with the separation of water and ethyl acetate, cause that the purity of the ethyl acetate solvent of recovery is low, economic worth reduces, and the response rate very low (experiments show that only have 30%), energy consumption is high, adsorbent service life short (using 24 months at most).
But experiments show that, Recovery Purifying is carried out according to device of the present invention, because desorption process is dry method, the ethyl acetate purity reclaimed can be made more than 99.5%, water content is less than 0.05%, and solvent recovering rate is more than 90%, it does not have secondary pollution, and adsorbent is short in 36 months for service life, energy consumption can reduce at least 20%.
If per diem processing organic exhaust gas 2500kg, the price of the purity of the recovery ethyl acetate solvent more than 99.5% is 5000 yuan/ton, and yearly amount of work is 320 days, then the economic worth contrast adopting the Dry recovery of existing hydrometallurgic recovery and the present invention is as follows:
| Hydrometallurgic recovery | Dry recovery | |
| The response rate | 30% | 90% |
| Day yield | 750kg | 2250kg |
| Year yield | 240 tons | 720 tons |
| Sales value | 1200000 yuan | 3600000 yuan |
| Processing cost | 76.8 ten thousand yuan | 194.4 ten thousand yuan |
| Generate profit | 43.2 ten thousand yuan | 165.6 ten thousand yuan |
Visible, under equal conditions, apparatus of the present invention are adopted to carry out the Recovery Purifying of organic exhaust gas, can realizing significance economic worth, up to about 3.8 times of prior art, not only economic worth is notable, and the gas discharged complies fully with environmental requirement, therefore, the present invention achieves significance progress relative to prior art, has significant economic benefit and environmental benefit.
Finally need described herein: above content is served only for technical scheme is described in more detail; it is not intended that limiting the scope of the invention, some nonessential improvement and adjustment that those skilled in the art makes according to the foregoing of the present invention belong to protection scope of the present invention.
Claims (10)
1. the dry cleaning recovery device of an organic exhaust gas, including adsorption system, desorption system and condensate recovery system, described adsorption system includes at least 2 adsorbers being arranged in parallel, described desorption system includes circulating fan, heater and nitrogen charging device, control valve it is provided with respectively in inlet end and the outlet side of each adsorber, and the inlet end of all adsorbers is attempted by the inlet end of circulating fan, the outlet side of all adsorbers is attempted by the outlet side of nitrogen charging device, the pipeline that the inlet end of all adsorbers is connected with the inlet end of circulating fan is respectively equipped with control valve, the pipeline that the outlet side of all adsorbers is connected with the outlet side of nitrogen charging device is respectively equipped with control valve, described heater is serially connected between circulating fan and nitrogen charging device；It is characterized in that: described condensate recovery system includes the multi-stage condensing device and the suction fan that are sequentially connected in series, the inlet end of chopped-off head condenser therein is connected with the outlet side of circulating fan, the outlet side of last condenser stage is connected with the inlet end of suction fan, the outlet side of suction fan is connected with the inlet end of chopped-off head condenser again, and the outlet side of chopped-off head condenser is connected with the inlet end of heater；Further, it is respectively equipped with control valve in inlet end and the outlet side of chopped-off head condenser, the pipeline that suction fan is connected with chopped-off head condenser also is provided with control valve.
2. dry cleaning recovery device according to claim 1, it is characterized in that: described multi-stage condensing device divides three grades, chopped-off head is air cooler, and secondary is cooling water condensation device, final stage is chilled water condenser, and cooling water condensation device is all connected with solvent recovery container with chilled water condenser.
3. dry cleaning recovery device according to claim 1, it is characterized in that: described device also includes purifying adsorber, the described inlet end of purification adsorber is connected with the outlet side of suction fan, the outlet side of described purification adsorber is connected with the inlet end of chopped-off head condenser, and is respectively equipped with control valve in inlet end and the outlet side of described purification adsorber.
4. dry cleaning recovery device according to claim 3, it is characterized in that: the inlet end of described purification adsorber is also connected with the outlet side of nitrogen charging device, the outlet side of described purification adsorber is also connected with the inlet end of circulating fan, and is respectively equipped with control valve purifying on the pipeline that adsorber is connected with circulating fan and purifying on the pipeline that adsorber is connected with nitrogen charging device.
5. dry cleaning recovery device according to claim 1, it is characterized in that: the outlet side of described heater and the outlet side of nitrogen charging device are attempted by the outlet side of each adsorber, and are also respectively equipped with control valve at the inlet end of heater and the outlet side of nitrogen charging device.
6. dry cleaning recovery device according to claim 1, it is characterized in that: between circulating fan and nitrogen charging device, be also serially connected with cooler, described cooler is connected in parallel on the pipeline that circulating fan is connected with nitrogen charging device with heater, and the inlet end of cooler is provided with control valve.
7. dry cleaning recovery device according to any one of claim 1 to 6, it is characterised in that: described device also includes conveying gas blower, the outlet side of described conveying gas blower and and the adsorber air inlet end that connects between be serially connected with waste gas pre-treating device.
8. dry cleaning recovery device according to claim 7, it is characterised in that: the outlet side of described waste gas pre-treating device is also connected with the inlet end of circulating fan, and is provided with control valve on the pipeline being connected.
9. dry cleaning recovery device according to claim 7, it is characterised in that: described waste gas pre-treating device is provided with filtering module and temperature-regulating module.
10. dry cleaning recovery device according to claim 1, it is characterised in that: described adsorber is active carbon adsorber.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108261885A (en) * | 2017-12-29 | 2018-07-10 | 浙江环耀环境建设有限公司 | A kind of organic waste gas treatment system and solvent recovery process |
| CN112588075A (en) * | 2020-11-12 | 2021-04-02 | 武汉旭日华环保科技股份有限公司 | Organic waste gas purification and recovery device with deep desorption function and method thereof |
| CN113617183A (en) * | 2021-06-23 | 2021-11-09 | 佛山市科蓝环保科技股份有限公司 | VOCs desorption device and VOCs desorption method of activated carbon assembly |
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