CN113181743A - Method for treating carbon disulfide in waste gas generated in viscose fiber production - Google Patents
Method for treating carbon disulfide in waste gas generated in viscose fiber production Download PDFInfo
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- CN113181743A CN113181743A CN202110555136.9A CN202110555136A CN113181743A CN 113181743 A CN113181743 A CN 113181743A CN 202110555136 A CN202110555136 A CN 202110555136A CN 113181743 A CN113181743 A CN 113181743A
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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
- B01D53/14—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
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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
- B01D53/14—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
- B01D53/1425—Regeneration of liquid absorbents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention provides a method for treating carbon disulfide in waste gas generated in viscose fiber production, and belongs to the technical field of factory waste recycling. It includes: from viscose fiber production plant through the process containing CS2After the absorption tower of the absorbent, the product containing CS is obtained2Absorption liquid and removal of CS2The exhaust gas of (3); after being uniformly mixed with water through a liquid mixing tank, the mixture containing CS is obtained2And water; after passing through a heat exchanger, preheated CS-containing gas is obtained2And water; after passing through a first regeneration tower, obtaining CS2Recovering the intermediate product and containing a portion of CS2And water; after passing through a second regeneration tower, CS is obtained2Recovery of intermediates and regenerated CS2An absorbent; CS2The recovered intermediate product is condensed and separated to obtain the recovered CS2And condensed water; recovered CS2To the CS2A storage tank; sending the condensed water to a liquid mixing tank; regenerated CS2The absorbent passes through a heat exchanger to obtain pre-cooled CS2An absorbent; preparation ofCooled CS2And the absorbent is cooled and then is sent to an absorption tower. It can promote sustainable long-term development.
Description
Technical Field
The invention relates to the technical field of recycling of factory waste, in particular to a method for treating carbon disulfide in waste gas generated in viscose fiber production.
Background
The excellent use properties of viscose fibres and the ready availability and reproducibility of the main raw material cellulose determine that it will be highly desirable for a long time, but in the production of viscose fibres, large amounts of hydrogen sulphide (H) are produced2S) and carbon disulfide (CS)2) The toxic waste gas causes serious pollution to the environment. The efficient and economic treatment of waste gas is always a technical problem in the viscose industry.
Disclosure of Invention
In view of the above, the present invention provides a method for treating carbon disulfide in waste gas from viscose fiber production, which has the advantages of low investment, low operation cost and CS treatment2Good treatment effect and CS2The removal rate is more than or equal to 90 percent and is suitable for low CS2The treatment of the waste gas of the concentration viscose glue is more practical.
In order to achieve the purpose, the technical scheme of the method for treating carbon disulfide in waste gas generated in viscose fiber production provided by the invention is as follows:
the method for treating carbon disulfide in waste gas generated in viscose fiber production comprises the following steps:
obtaining production waste gas from a viscose fiber production plant;
the exhaust gas containing CS2After the absorption tower of the absorbent, the product containing CS is obtained2Absorption liquid and removal of CS2The exhaust gas of (3);
said compound containing CS2The absorbing solution is evenly mixed with water through a liquid mixing tank to obtain the absorbing solution containing CS2And water;
said compound containing CS2The mixed liquid with water absorbs heat through a heat exchanger to obtain preheated mixed liquid containing CS2And water;
said preheated mixture containing CS2Desorbing the mixed solution with water by a first regeneration tower to obtain CS2Recovering the intermediate product and containing a portion of CS2And water;
said containing moiety CS2The mixed liquid with water is desorbed and regenerated by a second regeneration towerObtaining CS2Recovery of intermediates and regenerated CS2An absorbent;
the CS2The recovered intermediate product is condensed by a condenser and separated by a separator to obtain the recovered CS2And condensed water;
the recovered CS2To the CS2A storage tank;
the condensed water is sent to a liquid mixing tank;
the regenerated CS2After the absorbent emits heat through the heat exchanger, pre-cooled CS is obtained2An absorbent;
the pre-cooled CS2And the absorbent is cooled and then is sent to an absorption tower.
The method for treating carbon disulfide in waste gas generated in viscose fiber production provided by the invention can be further realized by adopting the following technical scheme.
Preferably, in the absorption column, the CS is2The absorbent is sprayed from the upper part of the absorption tower.
Preferably, the preheated sulfur-containing compound contains CS2And a mixed liquid of water and CS is introduced from the upper part of the first regeneration tower2The recovered intermediate product is discharged from the top of the regeneration tower.
Preferably, the moiety containing CS2And a mixed liquid of water and CS is fed from the upper part of the second regeneration tower2The recovered intermediate product is discharged from the top of the regeneration tower.
As a preference, the first and second liquid crystal compositions are,
the temperature range of the waste gas generated in the viscose fiber production is 20-60 ℃;
CS of waste gas generated in production of viscose fibers2The content value range is 100mg/m3～25000mg/m3。
Preferably, the CS in the off-gas in the absorption column2CS sprayed from the upper part of the absorption tower2The absorption temperature of the absorbent ranges from 15 ℃ to 40 ℃.
Preferably, the absorption CS2The absorption liquid passes through the bottom of the absorption towerThe mixture of the mixed liquid tank and water is pumped into the mixed liquid tank and contains CS2And in the mixed liquid of water and water, the mass percentage content of the water ranges from 7 percent to 25 percent.
Preferably, the mixture containing CS is mixed with water2The mixed liquid with water enters a heat exchanger from a mixed liquid tank through a pump, absorbs heat and then enters a regeneration tower from the upper part of the first regeneration tower for desorption CS2When the temperature of the tower bottom is 105-115 ℃, the temperature of the tower top is 100-105 ℃.
Preferably, the mixture containing CS is mixed with water2The mixed liquid with water passes through the first regeneration tower and then CS2The desorption rate is more than or equal to 85 percent, and the water evaporation rate is 85 to 95 percent.
Preferably, the mixture containing CS is mixed with water2The mixed liquid with water passes through the desorption part CS of the first regeneration tower2The latter containing part CS2And the mixed liquid of the water and the mixed liquid enters the regeneration tower from the upper part of the second regeneration tower from the bottom of the first regeneration tower for desorption and regeneration, wherein the temperature of the bottom of the tower is 115-125 ℃, and the temperature of the top of the tower is 105-115 ℃.
Preferably, the moiety containing CS2The mixed liquid with water passes through the second regeneration tower and then CS2The desorption rate was 100%, while the water evaporation rate was 100%.
Preferably, the regenerated CS2And the absorbent enters the heat exchanger from the bottom of the second regeneration tower through a pump to emit heat, and is then cooled and sent to the absorption tower.
Preferably, the CS is2The liquid-gas ratio of the absorbent and the waste gas entering the absorption tower is 3L/m3～10L/m3。
Preferably, the CS is2The absorbent is one or more of the substances represented by the following structures:
R1-O(CH2CH2O)n-R2and/or R3-O(CH2CH2O)n OC-R4；
Wherein the content of the first and second substances,
n: 1 to 6;
R1-: h-or an alkyl group having 1 to 4 carbon atoms;
when n is 1, R2-: h-or an alkyl group having 2 to 4 carbon atoms;
when n ≠ 1, R2-: h-or an alkyl group having 1 to 4 carbon atoms;
R3-: an alkyl group having 1 to 4 carbon atoms;
R4-: an alkyl group having 1 to 3 carbon atoms;
R1-、R2-、R3-、R4-: the four are different, the same, or any two or three are the same.
Preferably, the removal of CS2The waste gas is sent into a waste gas flue to be treated to obtain clean gas.
The method for treating carbon disulfide in waste gas generated in viscose fiber production can be applied to waste gas treatment of newly-built viscose fiber production enterprises, can also be used for carrying out technical upgrading and reconstruction on waste gas treatment of the existing viscose fiber production enterprises, can also be used for additionally carrying out waste gas treatment on some viscose filament enterprises which do not carry out waste gas treatment, and can be used for treating recovered CS (carbon disulfide) generated in waste gas generated in viscose fiber production through treatment2Is sent into the CS2The condensate water is sent into the liquid mixing tank for recycling, and CS is removed2The exhaust gas of (2) has little harm to the environment. Compared with the existing waste gas treatment technology, the method can greatly reduce investment, reduce operation cost, reduce the influence on the environment, and can not generate secondary pollution, thereby promoting the sustainable long-term development of enterprises.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flow chart illustrating steps of a method for treating carbon disulfide in waste gas from viscose fiber production according to an embodiment of the present invention.
Detailed Description
In view of the above, the present invention provides a method for treating carbon disulfide in waste gas from viscose fiber production, which has the advantages of low investment, low operation cost and CS treatment2Good treatment effect and CS2The removal rate is more than or equal to 90 percent and is suitable for low CS2The treatment of the waste gas of the concentration viscose glue is more practical.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of a method for treating carbon disulfide in waste gas from viscose fiber production according to the present invention with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
In the following description, "raw gas" refers to exhaust gas collected from a viscose fiber production plant; "purge gas" means CS in the exhaust gas2CS sprayed from the upper part of the absorption tower2Absorbing by absorbent to remove CS2The latter exhaust gas; CS in feed gas2The removal rate of (b) represents the removal rate of CS in the viscose waste gas2The treatment effect of (2), CS in the feed gas2The removal rate of (C) was 100 (%) (CS in raw material gas)2content-CS in purified gas2content)/CS in feed gas2And (4) content.
Example 1:
at a temperature of 30 ℃ and CS2The content is 8225mg/m3Is continuously fed into an absorption tower where CS in the feed gas is present2CS sprayed from the upper part of the absorption tower2Absorbent HO (CH)2CH2O)3CH2CH2CH2CH3Absorption at 30 deg.C for CS2The liquid-gas ratio of the absorbent and the raw material gas entering the absorption tower is 6L/m3Removal of CS2The purified gas is sent into a waste gas flue for other treatment; absorption of CS2The absorption liquid enters a liquid mixing tank from the bottom of the absorption tower through a pump to be mixed with water, and the mixed liquid contains CS2The mass percentage of water in the mixed solution of water and water is 20 percent; containing CS2The mixed liquid (rich liquid) of water and the lean-rich liquid enters a lean-rich liquid heat exchanger through a pump from a mixed liquid tank, the mixed liquid enters a first regeneration tower with the tower bottom temperature of 110 ℃ and the tower top temperature of 100 ℃ from the upper part of the first regeneration tower after absorbing heat, and 90 percent of CS is desorbed2While simultaneously distilling 90% of the water and then containing a portion of CS2The mixed solution of water and the first regeneration tower enters the second regeneration tower from the upper part of the second regeneration tower from the bottom of the first regeneration tower, the temperature of the tower bottom is 120 ℃, the temperature of the tower top is 110 ℃ for desorption and regeneration, and the CS is completely desorbed2While the CS regenerated after water evaporation2The absorbent (barren solution) enters the barren and rich solution heat exchanger from the bottom of the second regeneration tower through a pump to release heat, is cooled through a barren solution cooler and then is sent to the upper part of the absorption tower to be sprayed, and CS in the feed gas is absorbed again2The absorbent circulates back and forth to form continuous absorption and desorption of CS2The process of (2); desorbed CS2And simultaneously evaporating water, discharging from the top of the first regeneration tower and the second regeneration tower, condensing by a condenser, separating by a separator, and separating CS2To the CS2The storage tank is reused as a raw material for producing viscose fibers, and the separated condensed water is sent to the liquid mixing tank for recycling. CS in the purified gas was measured at any time point after 0.5h of treatment operation2The content is 428mg/m3In the feed gas CS2The removal rate of (D) was 94.8%.
Example 2:
otherwise, the same as example 1, except that CS2The absorbent is HO (CH)2CH2O)6CH3. Purifying CS in gas2The content is 319mg/m3In the feed gas CS2The removal rate of (D) was 96.1%.
Example 3:
otherwise, the same as example 1, except that CS2The absorbent is HO (CH)2CH2O)4H. Purifying CS in gas2The content is 576mg/m3In the feed gas CS2The removal rate of (D) was 93.0%.
Example 4:
otherwise, the same as example 1, except that CS2The absorbent is HOCH2CH2OCH2CH3. Purifying CS in gas2The content is 394mg/m3In the feed gas CS2The removal rate of (D) was 95.2%.
Example 5:
otherwise, the same as example 1, except that CS2The absorbent is CH3OCH2CH2OCH2CH2CH3. Purifying CS in gas2The content is 520mg/m3In the feed gas CS2The removal rate of (D) was 93.7%.
Example 6:
otherwise, the same as example 1, except that CS2The absorbent is
CH3CH2CH2CH2O(CH2CH2O)2CH2CH2CH2CH3. Purifying CS in gas2The content is 617mg/m3In the feed gas CS2The removal rate of (D) was 92.5%.
Example 7:
otherwise, the same as example 1, except that CS2The absorbent is HOCH2CH2And (5) OH. Purifying CS in gas2The content is 665mg/m3In the feed gas CS2The removal rate of (D) was 91.9%.
Example 8:
otherwise, the same as example 1, except that CS2The absorbent is
CH3CH2CH2CH2OCH2CH2OOCCH3. Purifying CS in gas2The content is 823mg/m3In the feed gas CS2The removal rate of (D) was 90.0%.
Example 9:
otherwise, the same as example 1, except that CS2The absorbent is CH3CH2O(CH2CH2O)5OCCH3. Purifying CS in gas2The content is 485mg/m3In the feed gas CS2The removal rate of (D) was 94.1%.
Example 10:
otherwise, the same as example 1, except that CS2The absorbent accounts for 50 percent by mass: 50% HOCH2CH2OH and CH3CH2CH2CH2OCH2CH2OOCCH3A mixture of (a). Purifying CS in gas2The content is 551mg/m3In the feed gas CS2The removal rate of (D) was 93.3%.
Example 11:
otherwise, the same as example 1 except that the absorption temperature was 40 ℃ and the liquid-gas ratio was 8L/m3. The CS2 content in the purified gas is 494mg/m3In the feed gas CS2The removal rate of (D) was 94.0%.
Example 12:
otherwise, the same as in example 1 was repeated, except that the feed gas temperature was 60 ℃ and the absorption temperature was 20 ℃. Purifying CS in gas2The content is 362mg/m3In the feed gas CS2The removal rate of (D) was 95.6%.
Example 13:
otherwise, the same as example 1 except that the absorption temperature was 20 ℃ and the liquid-gas ratio was 3L/m3. Purifying CS in gas2The content is 806mg/m3The removal rate of CS2 in the feed gas was 90.2%.
Example 14:
at a temperature of 20 ℃ CS2The content is 100mg/m3Is continuously fed into an absorption tower where CS in the feed gas is present2CS sprayed from the upper part of the absorption tower2Absorbent HO (CH)2CH2O)3CH2CH2CH2CH3Absorption at 15 deg.C for CS2The absorbent and the raw material gas enter an absorption towerHas a liquid-gas ratio of 10L/m3Removal of CS2The purified gas is sent into a waste gas flue for other treatment; absorption of CS2The absorption liquid enters a liquid mixing tank from the bottom of the absorption tower through a pump to be mixed with water, and the mixed liquid contains CS2The mass percentage of water in the mixed solution of water and water is 7 percent; containing CS2The mixed liquid (rich liquid) of water and the lean-rich liquid enters a lean-rich liquid heat exchanger through a pump from a mixed liquid tank, the mixed liquid enters a first regeneration tower with the tower bottom temperature of 115 ℃ and the tower top temperature of 100 ℃ from the upper part of the first regeneration tower after absorbing heat, and 100 percent of CS is desorbed2Simultaneously evaporating 95% of water, then introducing the mixed solution containing part of water from the bottom of the first regeneration tower into a second regeneration tower with the tower bottom temperature of 115 ℃ and the tower top temperature of 105 ℃ from the upper part of the second regeneration tower for regeneration, and evaporating the water to regenerate the CS2The absorbent (barren solution) enters the barren and rich solution heat exchanger from the bottom of the second regeneration tower through a pump to release heat, is cooled through a barren solution cooler and then is sent to the upper part of the absorption tower to be sprayed, and CS in the feed gas is absorbed again2The absorbent circulates back and forth to form continuous absorption and desorption of CS2The process of (2); desorbed CS2And the distilled water is discharged from the top of the first regeneration tower and the second regeneration tower, condensed by a condenser and separated by a separator, and the separated CS2To the CS2The storage tank is reused as a raw material for producing viscose fibers, and the separated condensed water is sent to the liquid mixing tank for recycling. CS in the purified gas was measured at any time point after 0.5h of treatment operation2The content is 9mg/m3In the feed gas CS2The removal rate of (D) was 91.0%.
Example 15:
at a temperature of 20 ℃ CS2The content is 25000mg/m3Is continuously fed into an absorption tower where CS in the feed gas is present2CS sprayed from the upper part of the absorption tower2Absorbent HO (CH)2CH2O)3CH2CH2CH2CH3Absorption at 15 deg.C for CS2The liquid-gas ratio of the absorbent and the raw material gas entering the absorption tower is 10L/m3Removal of CS2The purified gas is sent into a waste gas flue for other treatment; absorption of CS2The absorption liquid enters a liquid mixing tank from the bottom of the absorption tower through a pump to be mixed with water, and the mixed liquid contains CS2The mass percentage of water in the mixed solution of water and water is 25 percent; containing CS2The mixed liquid (rich liquid) of water and the lean-rich liquid enters a lean-rich liquid heat exchanger through a pump from a mixed liquid tank, the mixed liquid enters a first regeneration tower with the tower bottom temperature of 105 ℃ and the tower top temperature of 105 ℃ from the upper part of the first regeneration tower after absorbing heat, and 85% of CS is desorbed2While simultaneously distilling off 85% of the water, then containing part of the CS2The mixed solution of water and the first regeneration tower enters a second regeneration tower from the upper part of the second regeneration tower from the bottom of the first regeneration tower, the tower bottom temperature is 125 ℃, the tower top temperature is 115 ℃ for desorption and regeneration, and the CS is completely desorbed2While the CS regenerated after water evaporation2The absorbent (barren solution) enters the barren and rich solution heat exchanger from the bottom of the second regeneration tower through a pump to release heat, is cooled through a barren solution cooler and then is sent to the upper part of the absorption tower to be sprayed, and CS in the feed gas is absorbed again2The absorbent circulates back and forth to form continuous absorption and desorption of CS2The process of (2); desorbed CS2And simultaneously evaporating water, discharging from the top of the first regeneration tower and the second regeneration tower, condensing by a condenser, separating by a separator, and separating CS2To the CS2The storage tank is reused as a raw material for producing viscose fibers, and the separated condensed water is sent to the liquid mixing tank for recycling. CS in the purified gas was measured at any time point after 0.5h of treatment operation2The content is 725mg/m3In the feed gas CS2The removal rate of (D) was 97.1%.
The method for treating carbon disulfide in waste gas generated in viscose fiber production can be applied to waste gas treatment of newly-built viscose fiber production enterprises, can also be used for carrying out technical upgrading and reconstruction on waste gas treatment of the existing viscose fiber production enterprises, can also be used for additionally carrying out waste gas treatment on some viscose filament enterprises which do not carry out waste gas treatment, and can be used for treating recovered CS (carbon disulfide) generated in waste gas generated in viscose fiber production through treatment2Is sent into the CS2The condensate water is sent into the liquid mixing tank for recycling, and CS is removed2The exhaust gas of (2) has little harm to the environment. Compared with the existing waste gas treatment technology, the method can greatly reduce investment and operationThe cost is reduced, the influence on the environment is reduced, and secondary pollution is avoided, so that the sustainable long-term development of enterprises can be promoted.
Wherein, the CS of the specific structure of the present invention2Absorbent R1-O(CH2CH2O)n-R2And/or R3-O(CH2CH2O)n OC-R4The material is a high boiling point material, has very low vapor pressure and good thermal stability, so that the material loss and secondary pollution can not be caused in the using process; wherein n is an integer of 1 to 6, R1-、R2-、R3-、R4All are lower alkyl groups, so that the preparation is easy and the cost is low.
According to the invention, CS2Absorption of CS by the absorbent2The absorption liquid is sent into a liquid mixing tank to be mixed with water, and the water has the following functions: (1) in the regeneration tower, the steam stripping function is realized, and the evaporation of water can promote the CS2By desorption evaporation, the water vapor can drive the CS2Upward flow of steam to cause CS2The vapor is easy to discharge from the top of the tower; (2) in the regeneration tower, continuous water vapor ascends to give heat to the tower top and avoid CS caused by low temperature of the tower top2The vapor liquefies and travels downward. The invention adopts the first and the second two-stage regeneration towers, and can ensure the regenerated CS flowing out from the bottom of the second regeneration tower2The absorbent no longer contains CS2And water, thereby avoiding CS2CS in absorbent2And the presence of water results in CS in the absorber column2Absorbent pair CS2The absorption capacity of (b) is reduced.
In particular, the present invention provides a CS2Absorbent pair CS2High absorption capacity, high absorption efficiency and good desorption regeneration performance, thereby being suitable for different CS in a wider range2Treatment of concentrated viscose waste gas, in particular low CS not adapted by other technical methods2And (4) treating the viscose waste gas with concentration. CS of specific Structure of the present invention2The absorbent has stable performance and can be recycled, and the CS is realized only by the difference of the temperature of the absorption liquid flowing through the absorption tower and the regeneration tower in the recycling process, such as the invention2The absorption and desorption are carried out, the desorption temperature is low, the energy consumption is low, and therefore, the method is adoptedMethod for treating CS in viscose waste gas2Simple process and equipment, less investment and lower running cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for treating carbon disulfide in waste gas generated in viscose fiber production is characterized by comprising the following steps:
obtaining production waste gas from a viscose fiber production plant;
the exhaust gas containing CS2After the absorption tower of the absorbent, the product containing CS is obtained2Absorption liquid and removal of CS2The exhaust gas of (3);
said compound containing CS2The absorbing solution is evenly mixed with water through a liquid mixing tank to obtain the absorbing solution containing CS2And water;
said compound containing CS2The mixed liquid with water absorbs heat through a heat exchanger to obtain preheated mixed liquid containing CS2And water;
said preheated mixture containing CS2Desorbing the mixed solution with water by a first regeneration tower to obtain CS2Recovering the intermediate product and containing a portion of CS2And water;
said containing moiety CS2Desorbing and regenerating the mixed solution of the water and the water by a second regeneration tower to obtain CS2Recovery of intermediates and regenerated CS2An absorbent;
the CS2Recovering intermediate product, cooling by condenserThe recovered CS is obtained after separation by a condenser and a separator2And condensed water;
the recovered CS2To the CS2A storage tank;
the condensed water is sent to a liquid mixing tank;
the regenerated CS2After the absorbent emits heat through the heat exchanger, pre-cooled CS is obtained2An absorbent;
the pre-cooled CS2And the absorbent is cooled and then is sent to an absorption tower.
2. The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1, wherein in the absorption tower, the CS is2The absorbent is sprayed from the upper part of the absorption tower.
3. The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1, wherein the preheated waste gas contains CS2And a mixed liquid of water and CS is introduced from the upper part of the first regeneration tower2The recovered intermediate product is discharged from the top of the regeneration tower.
4. Method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1, wherein said waste gas containing part of CS2And a mixed liquid of water and CS is fed from the upper part of the second regeneration tower2The recovered intermediate product is discharged from the top of the regeneration tower.
5. The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1,
the temperature range of the waste gas generated in the viscose fiber production is 20-60 ℃;
CS of waste gas generated in production of viscose fibers2The content value range is 100mg/m3～25000mg/m3。
6.The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 2, wherein CS in the waste gas in the absorption tower2CS sprayed from the upper part of the absorption tower2The absorption temperature of the absorbent ranges from 15 ℃ to 40 ℃.
7. The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1, wherein said absorbing CS2The absorption liquid enters a liquid mixing tank from the bottom of the absorption tower through a pump and is mixed with water to contain CS2And in the mixed liquid of water and water, the mass percentage content of the water ranges from 7 percent to 25 percent.
8. Method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1 or 7, wherein the mixture with water contains CS2The mixed liquid with water enters a heat exchanger from a mixed liquid tank through a pump, absorbs heat and then enters a regeneration tower from the upper part of the first regeneration tower for desorption CS2When the temperature of the tower bottom is 105-115 ℃, the temperature of the tower top is 100-105 ℃.
9. The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 8, wherein the CS-containing mixture is mixed with water2The mixed liquid with water passes through the first regeneration tower and then CS2The desorption rate is more than or equal to 85 percent, and the water evaporation rate is 85 to 95 percent.
10. The method for treating carbon disulfide in waste gas from viscose fiber production according to claim 1, wherein the CS-containing mixture is mixed with water2The mixed liquid with water passes through the desorption part CS of the first regeneration tower2The latter containing part CS2When the mixed solution with water enters a regeneration tower from the upper part of a second regeneration tower from the bottom of the first regeneration tower for desorption and regeneration, the temperature of the bottom of the tower is 115-125 ℃, and the temperature of the top of the tower is 105-115 ℃;
preferably, the moiety containing CS2The mixed solution of water and water is passed throughAfter passing through the second regeneration tower CS2The desorption rate is 100 percent, and the water evaporation rate is 100 percent;
preferably, the regenerated CS2The absorbent enters the heat exchanger from the bottom of the second regeneration tower through a pump to emit heat, and is sent to the absorption tower after being cooled;
preferably, the CS is2The liquid-gas ratio of the absorbent and the waste gas entering the absorption tower is 3L/m3～10L/m3；
Preferably, the CS is2The absorbent is one or more of the substances represented by the following structures:
R1-O(CH2CH2O)n-R2and/or R3-O(CH2CH2O)n OC-R4；
Wherein the content of the first and second substances,
n: 1 to 6;
R1-: h-or an alkyl group having 1 to 4 carbon atoms;
when n is 1, R2-: h-or an alkyl group having 2 to 4 carbon atoms;
when n ≠ 1, R2-: h-or an alkyl group having 1 to 4 carbon atoms;
R3-: an alkyl group having 1 to 4 carbon atoms;
R4-: an alkyl group having 1 to 3 carbon atoms;
R1-、R2-、R3-、R4-: the four are different, the same, or any two or three are the same;
preferably, the removal of CS2The waste gas is sent into a waste gas flue to be treated to obtain clean gas.
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