CN105561622A - Condensation treatment method of organic waste gas - Google Patents
Condensation treatment method of organic waste gas Download PDFInfo
- Publication number
- CN105561622A CN105561622A CN201610090035.8A CN201610090035A CN105561622A CN 105561622 A CN105561622 A CN 105561622A CN 201610090035 A CN201610090035 A CN 201610090035A CN 105561622 A CN105561622 A CN 105561622A
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- Prior art keywords
- cooling fluid
- water
- waste gas
- exhaust gas
- condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0087—Recirculating of the cooling medium
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a condensation treatment method of an organic waste gas. The method comprises the following steps that 1, the target cooling temperature of an organic waste gas to be treated is determined, and the physical property of solvent in the organic waste gas to be treated is determined; 2, cooling liquid is selected according to the physical property of the solvent in the first step; 3, the organic waste gas to be treated is filtered and precooled and then makes contact with the cooling liquid directly, water and organic solvent are condensed out, and the waste gas is exhausted directly; 4, the condensed water and the organic solvent condensed out in the third step are mixed with the cooling liquid to form mixed liquid, and the mixed liquid is discharged; 5, separation is conducted on the mixed liquid obtained in the fourth step, the organic solvent, the water and the cooling liquid are separated. According to the condensation treatment method of the organic waste gas, the cooling liquid and the organic waste gas to be treated conduct heat exchange through gas-liquid direct contact, the waste gas is cooled, and then the organic solvent is condensed out; therefore, the treatment effect of the organic waste gas is obviously improved.
Description
Technical field
The present invention relates to technical field of waste gas treatment, particularly relate to a kind of condensation processing method of organic exhaust gas.
Background technology
At present for the condensation process of organic exhaust gas, the overwhelming majority is all be cooled to close to 0 DEG C by heat exchanger or evaporimeter by gas temperature, but generally can not be cooled to less than 0 DEG C, especially handled organic exhaust gas and the intermiscibility of water very poor time, organic exhaust gas is condensed to the problem that less than 0 DEG C just there will be the water vapour condensation frosting in air.Water vapour condensation frosting can be attached to heat exchange efficiency, the increase windage that heat exchanger surface seriously reduces heat exchanger, along with the increase frosting degree of time can be more and more serious, finally cause treatment facility not run, even damage equipment.
But the concentration of a lot of organic exhaust gas contained organic solvent when being cooled to 0 DEG C is still very high, causes the effect of exhaust-gas treatment very undesirable.Gas can be cooled to the treatment facility of less than 0 DEG C at present, its groundwork mode has two kinds: 1, service intermittent, after equipment frosting to a certain extent, stop cooling, carry out intensification defrosting to equipment, defrosting terminates to carry out condensation work again, and this planning device can not run continuously, energy consumption is high; 2, two groups or more condensation process equipment alternately cooling and defrosting, this scheme can realize continuous condensation process, but control is complicated, cost is high.
Summary of the invention
The object of the invention is the defect for prior art, and provides a kind of condensation processing method of organic exhaust gas, can realize continuous condensation process, organic exhaust gas is cooled to less than 0 DEG C, has the advantages that energy consumption is low, control is simple, cost is low.
For reaching above object, the technical solution adopted in the present invention is:
A condensation processing method for organic exhaust gas, is characterized in that: comprise step:
(1) determine the target chilling temperature of pending organic exhaust gas, and determine the physical characteristic of solvent contained in pending organic exhaust gas;
(2) cooling fluid is chosen according to the physical characteristic of solvent in step (1);
Wherein, described cooling fluid meets the following conditions:
A. the freezing point of described cooling fluid is lower than the target chilling temperature of pending organic exhaust gas;
B. described cooling fluid and water dissolve each other;
C. the boiling point of described cooling fluid is higher than the boiling point of water;
(3) directly contacted with described cooling fluid after filtration, precooling by pending organic exhaust gas, condensation of water and organic solvent, waste gas is directly discharged;
(4) condensed water condensation in step (3) gone out and organic solvent and cooling fluid form mixing material and discharge;
(5) mixing material in step (4) is separated, isolates organic solvent, water and cooling fluid;
(6) isolated cooling fluid in step (5) is returned step (3) after freezing to recycle.
Further, the freezing point of the cooling fluid chosen in described step (2) is lower than the target chilling temperature of pending gas 5 ~ 10 DEG C.
Further, the temperature of pending organic exhaust gas after precooling in described step (3) is 0 ~ 5 DEG C.
Further, the separate mode of the mixing material in described step (5) is specially the physical separation such as Gravity Separation, evaporation separation.
The condensation processing method of organic exhaust gas provided by the invention, sub-cooled section below 0 DEG C, directly contact generation heat exchange with pending organic exhaust gas by gas-liquid by a kind of cooling fluid, make waste gas cool condensation then and go out organic solvent, significantly improve the treatment effect of organic exhaust gas; Because the freezing point of cooling fluid is lower than the target chilling temperature of pending gas, therefore under target chilling temperature, good mobility is still had, ensure that cooling effect, the freezing point that the water also making condensation go out and the mixing material of cooling fluid are formed is lower than the freezing point of the aqueous solution of target chilling temperature, thus guarantee that steam condensation frosting can not occur whole cooling procedure, thus can guarantee that cooling procedure can be continuous, cooling fluid after released cold quantity is by simple separation and can recycle after cooling again, reduces energy consumption and processing cost.
Accompanying drawing explanation
Fig. 1 is the process chart of condensation processing method provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
Utilize condensation processing method process of the present invention containing the organic exhaust gas of ethyl acetate
(1) determine that the target chilling temperature of the pending waste gas containing ethyl acetate is-25 DEG C, and determine the physical characteristic of ethyl acetate;
(2) according to the physical characteristic such as freezing point, boiling point of ethyl acetate, select the glycol water of 50%VOL as cooling fluid, wherein, the freezing point of the glycol water of described glycol water is-38 DEG C;
(3) glycol water is cooled to-30 DEG C, then by containing ethyl acetate organic exhaust gas through filtering and impurity removing, be chilled to 0 DEG C ~ 5 DEG C in advance after directly contact with described glycol water, realize heat exchange, condensation goes out ethyl acetate and water;
(4) mixing material that the condensed water that in above-mentioned steps, condensation goes out and organic solvent and cooling fluid are formed flows downward by self gravitation effect and discharges;
(5) mixing material of the ethylene glycol of discharge, water and ethyl acetate is carried out simple separation;
Concrete, because the solubility of ethyl acetate in water and ethylene glycol is all smaller, so first isolated the ethyl acetate on upper strata by Gravity Separation, a small amount of ethyl acetate of the glycol water that subnatant mainly dilutes and dissolving; Because the boiling point of ethylene glycol is far above water and ethyl acetate, so again by simple decompression distillation, distill out ethyl acetate and the part water of dissolving, make the concentration of glycol water return to 50%VOL, wherein, the liquid that slips out of ethyl acetate and water can separating-purifying further;
(6) return step (3) after being freezed by glycol water isolated in above-mentioned steps to recycle.
Embodiment two
Utilize condensation processing method process of the present invention containing the organic exhaust gas of D40 solvent naphtha
D40 solvent naphtha is widely used in industrial cleaning agent, and as aluminium foil cleaning etc., the waste gas containing D40 solvent naphtha that general aluminium foil cleaning line is discharged is after the condensation process of-25 DEG C, and can reclaim the D40 solvent naphtha of more than 95%, the solvent naphtha content in waste gas is few.
(1) determine that the target chilling temperature of the pending waste gas containing D40 solvent naphtha is-25 DEG C, and determine the physical characteristic of D40 solvent naphtha;
(2) according to the physical characteristic such as freezing point, boiling point of D40 solvent naphtha, select the glycol water of 50%VOL as cooling fluid, wherein, the freezing point of the glycol water of described glycol water is-38 DEG C;
(3) glycol water is cooled to-30 DEG C, then by containing D40 solvent naphtha organic exhaust gas through filtering and impurity removing, be chilled to 0 DEG C ~ 5 DEG C in advance after with described glycol water, realize heat exchange, condensation goes out D40 solvent naphtha and water;
(4) mixing material that the condensed water that in above-mentioned steps, condensation goes out and organic solvent and cooling fluid are formed flows downward by self gravitation effect and discharges;
(5) mixing material of the ethylene glycol of discharge, water and D40 solvent naphtha is carried out simple separation;
Concrete, because D40 solvent naphtha can not be dissolved in water or ethylene glycol, so first isolated the D40 solvent naphtha on upper strata by Gravity Separation, the glycol water that subnatant is mainly mixed with the condensed water in waste gas and dilutes, then subnatant is distributed a part to be processed by distillation under vacuum, due to the boiling point of ethylene glycol far above water and with water not azeotropic, therefore fractionation water outlet, obtain the glycol water after concentrating, again the glycol water after concentrated is mixed with the subnatant do not shunted, by the concentration adjustment of mixed liquor to about 50%VOL,
(6) be return step (3) after the glycol water of 50%VOL freezes to recycle by the concentration obtained in above-mentioned steps.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (4)
1. a condensation processing method for organic exhaust gas, is characterized in that: comprise step:
(1) determine the target chilling temperature of pending organic exhaust gas, and determine the physical characteristic of solvent contained in pending organic exhaust gas;
(2) cooling fluid is chosen according to the physical characteristic of solvent in step (1);
Wherein, described cooling fluid meets the following conditions:
A. the freezing point of described cooling fluid is lower than the target chilling temperature of pending organic exhaust gas;
B. described cooling fluid and water dissolve each other;
C. the boiling point of described cooling fluid is higher than the boiling point of water;
(3) directly contacted with described cooling fluid after filtration, precooling by pending organic exhaust gas, condensation of water and organic solvent, waste gas is directly discharged;
(4) condensed water condensation in step (3) gone out and organic solvent and cooling fluid form mixing material and discharge;
(5) mixing material in step (4) is separated, isolates organic solvent, water and cooling fluid;
(6) isolated cooling fluid in step (5) is returned step (3) after freezing to recycle.
2. condensation processing method according to claim 1, is characterized in that: the freezing point of the cooling fluid chosen in described step (2) is lower than the target chilling temperature of pending gas 5 ~ 10 DEG C.
3. condensation processing method according to claim 1, is characterized in that: the temperature of the pending organic exhaust gas in described step (3) after precooling is 0 ~ 5 DEG C.
4. condensation processing method according to claim 1, is characterized in that: the separate mode of the mixing material in described step (5) is specially the physical separation such as Gravity Separation, evaporation separation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610090035.8A CN105561622B (en) | 2016-02-17 | 2016-02-17 | Condensation treatment method of organic waste gas |
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| CN201610090035.8A CN105561622B (en) | 2016-02-17 | 2016-02-17 | Condensation treatment method of organic waste gas |
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| CN105561622B CN105561622B (en) | 2017-05-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854334A (en) * | 2016-05-26 | 2016-08-17 | 广东环葆嘉节能科技有限公司 | Condensation treating method for organic waste gas |
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| JP2004141858A (en) * | 2002-08-30 | 2004-05-20 | Chugoku Electric Power Co Inc:The | Dehumidification method of exhaust gas, and system therefor |
| CN102836564A (en) * | 2012-08-31 | 2012-12-26 | 南京理工大学 | Condensation and adsorption-combined organic solvent recovering device |
| CN103341275A (en) * | 2013-07-11 | 2013-10-09 | 黄金培 | Method and special device for recycling organic solvent gas |
| CN104083981A (en) * | 2014-07-02 | 2014-10-08 | 天津大学 | Direct-contact-type deep cooling device for recycling volatile organic compound waste gas and recycling method |
| CN104606915A (en) * | 2015-02-09 | 2015-05-13 | 南京工业大学 | High-efficiency low-cost VOC recovery system and method |
| CN104815514A (en) * | 2014-10-29 | 2015-08-05 | 临安清云环保设备有限公司 | Waste gas treatment system using condensation method |
-
2016
- 2016-02-17 CN CN201610090035.8A patent/CN105561622B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004141858A (en) * | 2002-08-30 | 2004-05-20 | Chugoku Electric Power Co Inc:The | Dehumidification method of exhaust gas, and system therefor |
| CN102836564A (en) * | 2012-08-31 | 2012-12-26 | 南京理工大学 | Condensation and adsorption-combined organic solvent recovering device |
| CN103341275A (en) * | 2013-07-11 | 2013-10-09 | 黄金培 | Method and special device for recycling organic solvent gas |
| CN104083981A (en) * | 2014-07-02 | 2014-10-08 | 天津大学 | Direct-contact-type deep cooling device for recycling volatile organic compound waste gas and recycling method |
| CN104815514A (en) * | 2014-10-29 | 2015-08-05 | 临安清云环保设备有限公司 | Waste gas treatment system using condensation method |
| CN104606915A (en) * | 2015-02-09 | 2015-05-13 | 南京工业大学 | High-efficiency low-cost VOC recovery system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854334A (en) * | 2016-05-26 | 2016-08-17 | 广东环葆嘉节能科技有限公司 | Condensation treating method for organic waste gas |
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Address after: 528399 room 609, 6th floor, complex building, No.3, Desheng East Road, daodehe community, Daliang street, Shunde District, Foshan City, Guangdong Province Patentee after: Guangdong huanbaojia Health Technology Co.,Ltd. Address before: Room 607, research institute complex building, Xi'an Jiaotong University, 3 Daliang Desheng East Road, Shunde District, Foshan City, Guangdong Province, 528399 Patentee before: VERBOCA ENERGY-SAVING TECHNOLOGIES Co.,Ltd. |