CN106731524B - Acid making system for recycling SO2 from tail gas in starch production process - Google Patents
Acid making system for recycling SO2 from tail gas in starch production process Download PDFInfo
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- CN106731524B CN106731524B CN201710073041.7A CN201710073041A CN106731524B CN 106731524 B CN106731524 B CN 106731524B CN 201710073041 A CN201710073041 A CN 201710073041A CN 106731524 B CN106731524 B CN 106731524B
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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
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/48—Sulfur dioxide; Sulfurous acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
Abstract
SO recycled from tail gas in starch production process2The acid making system comprises SO connected from beginning to end in sequence2A gas collection unit, a purification treatment unit, an acid preparation working section and a sulfurous acid storage and reapplication unit; the unit equipment with tail gas possibly escaping from soaking section and crushing, grinding and sieving section is connected by pipeline to collect gas, the collected gas is connected to the inlet of fan, the gas from the outlet of fan is purified by pipeline in purifying tower meeting the requirement of the said working condition, the mixed gas is washed and purified by technological water to absorb SO2The water in the process is sent into an absorption tower for producing sulfurous acid, and the process can effectively finish the SO2The harmful components in the tail gas are recycled and purified, the waste is changed into valuable, the sulfur resource is saved, the production cost of enterprises is reduced, and the environment is protected from being polluted.
Description
Technical Field
The invention relates to the field of acid making process, in particular to a method for recycling SO from tail gas in the starch production process 2The acid production system of (1).
Background
At present, the corn starch production in China is completely understood by adopting a wet grinding technology, and the traditional production process is generally adopted, namely, the corn is soaked by sulfurous acid, then the corn is crushed, degermed, separated from embryo, ground, screened, separated from starch and protein and the like, the whole process is carried out in a slightly acidic medium, although the equipment system of the modern production line is closed, because the sulfurous acid has the characteristics of sensitivity to temperature change, volatility and instability, the SO is difficult to be completely eradicated in the production operation process2The gas escapes. This will inevitably cause pollution to the working environment, damage to the health of the operators, cause corrosive damage to equipment and facilities, and also aggravate the pollution to the atmosphere. Thus, governingThe pollution of the escaping tail gas is a necessary thing, which has positive significance to both enterprises and society.
According to the knowledge that at present, all units for tail gas treatment generally adopt the steps of feeding collected tail gas into a spray tower, washing with alkali liquor and then discharging, and the treatment mode has three defects: firstly, the treatment effect is not ideal, secondly, sulfur resources are wasted, thirdly, alkali liquor is consumed, and the production cost is increased for enterprises.
Disclosure of Invention
The invention aims to solve the problems and designs a method for recycling So from tail gas in the starch production process2The acid production system of (1).
The technical scheme of the invention for realizing the aim is that SO is recycled from tail gas in the starch production process2The acid making system comprises SO connected from beginning to end in sequence2A gas collection unit, a purification treatment unit, an acid preparation working section and a sulfurous acid storage and reapplication unit;
preferably, the SO2The gas collecting unit is formed by connecting a soaking tank of a soaking section with gas possibly escaping, a pressure curved sieve of a crushing, grinding and screening section, an intermediate storage tank, a gravity curved sieve and a screening washing tank by pipelines and is connected with an inlet of a tail gas fan.
Preferably, the purification unit is SO2A recovery purification treatment tower (21) and a water storage tank (22);
further, the water in the water storage tank comes from a process water system, and the process water is connected to the water storage tank through a hydraulic control valve and is controlled by the hydraulic control valve to be stable in water level;
the delivery outlet of the tail gas fan is connected through a pipeline and sends the gas into SO2The N1 gas inlet at the lower part of the recovery and purification treatment tower conveys the gas to SO2The water in the water storage tank in the recovery and purification treatment tower is sent to the SO by a delivery pump 2The water enters from the liquid inlet N3 at the upper part of the purification treatment tower, is arranged into a multi-stage weir flow which is turned back and forth and goes down under the action of the tower plate and is reversely moved with the entering gas, and is formed under the impact action of the gas flow in a weir flow sectionA large amount of large and small water drops, bubbles and water mist mixed turbulent flow areas are formed, the descending speed is reduced, two-phase fluid is in full contact with the mass transfer in the areas, and the water absorbs SO in the gas2The purified gas is discharged from the N2 gas outlet at the top of the tower, and the whole purification treatment process is completed.
Preferably, the acid making section is the prior art of the company (patent number: 201520339058.9) and comprises a water immersion cooler, a primary absorption tower, a secondary absorption tower and a tertiary absorption unit which are connected in sequence; the water absorbs SO in the gas2After flowing back to the water storage tank, the water is simultaneously sent to a water immersion cooler, a primary absorption tower and a secondary absorption tower of an acid making section by a delivery pump to make sulfurous acid, and acid liquor outlets are arranged at the lower parts of the water immersion cooler, the primary absorption tower and the secondary absorption tower and are connected with a sulfurous acid storage tank.
Furthermore, the water immersion cooler is connected with a sulfur burning device, the sulfur burning device can automatically adjust the output amount of sulfur dioxide by controlling the feeding amount of the spiral feeder and the working condition of the sulfur burning furnace through a controller, the gas output amount of the sulfur dioxide is stable, the sulfur dioxide is absorbed by three stages, the absorption efficiency is high, the exhausted gas almost does not contain the sulfur dioxide, and the atmosphere is not polluted; the absorption rate of sulfur dioxide is high, and the usage amount of sulfur is saved.
When water is delivered to an acid making working section and the water level in the water storage tank drops, the hydraulic control valve automatically increases the opening, the same water quantity is put in and delivered, the water level is maintained stable, and the SO in the water is kept2Concentration difference of contents SO as to facilitate SO2The absorption of the device can not generate large fluctuation, thereby ensuring the normal operation.
Preferably, the sulfurous acid storage and reuse unit is that sulfurous acid produced in the acid making section is connected with a sulfurous acid storage tank, and an outlet of the sulfurous acid storage tank is communicated with the acid using section to realize reuse.
SO recycled from tail gas in starch production process2The acid making system comprises the following process flow steps:
step 1-SO2Gas collection: in the production process of starchThe soaking tank of the soaking section, the pressure curved sieve, the intermediate storage tank, the gravity curved sieve and the screening and washing tank which are possibly provided with gas escaping from the soaking section are connected with the inlet of the tail gas fan by pipelines;
step 3-acid making section, storage and reapplication: the water absorbs SO in the gas2After flowing back to the water storage tank, the water is simultaneously sent to a water immersion cooler, a primary absorption tower and a secondary absorption tower of an acid making working section by a delivery pump to prepare sulfurous acid, acid liquor outlets are arranged at the lower parts of the water immersion cooler, the primary absorption tower and the secondary absorption tower and are connected with a sulfurous acid storage tank, and an outlet of the sulfurous acid storage tank is communicated with the acid using working section to realize the reutilization.
Has the beneficial effects that:
the whole system of the invention is simple and easy to construct, the unit equipment with the tail gas possibly having gas escape in the soaking section and the crushing, grinding and screening section is connected by a pipeline and connected to the inlet of a fan, and the internal of the related equipment is in a micro negative pressure state by the operation of the fan, thereby destroying the basic condition of gas escape, so that when the production operation is carried out, even if the operation port of the related equipment is opened, the gas escape can not be generated, and the working environment is effectively protected.
Blower outletThe gas sent out is sent into a purification treatment tower meeting the requirements of the working conditions through a pipeline for purification treatment, the mixed gas sent in is fully washed and purified by the process water, and SO is absorbed2The process water is sent into an absorption tower for producing sulfurous acid, and the process can effectively complete the process of SO2The harmful components in the tail gas are recycled and purified, the waste is changed into valuable, the sulfur resource is saved, the production cost of enterprises is reduced, and the environment is protected from being polluted.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram of the SO of the present invention2A schematic structural diagram of a recovery purification treatment tower;
in the figure, 1, SO2A gas collection unit; 11. A soaking section; 111. A soaking tank; 12-crushing, grinding and screening section; 121-pressure curved sieve; 122-an intermediate sump; 123-gravity curved screen; 124-screening washing tank; 2. A purification treatment unit; 21-SO2A recovery purification treatment tower; 211-N1 gas inlet; 212-N2 gas outlet; 213-N3 liquid inlet; 214-N4 liquid outlet; 215-tray; 216-a weir flow section; 22-a water storage tank; 3. An acid making section; 31-water immersion cooler; 32-a first stage absorption tower; 33-a secondary absorption column; 34-a three-stage absorption unit; 35-a sulfur burning device; 4. A sulfurous acid storage and reuse unit; a 41-sulfurous acid storage tank; 5. And a tail gas fan.
Detailed Description
The invention will now be described in detail with reference to the accompanying drawings, which show a process for the recovery of SO from tail gas from starch production2The acid making system comprises SO connected in sequence from beginning to end2A gas collection unit (1), a purification treatment unit (2), an acid making working section (3) and a sulfurous acid storage and reuse unit (4);
preferably, the SO2The gas collection unit (1) is composed of a soaking tank (111) of a soaking section (11) with possible gas escape, and a pressure curved sieve (121), an intermediate storage tank (122), a gravity curved sieve (123) and a sieving washing section (12) of a crushing, grinding and sieving sectionThe washing tank (124) is connected with an inlet of the tail gas fan (5) by a pipeline.
Preferably, the purification unit (2) is SO2A recovery purification treatment tower (21) and a water storage tank (22);
further, the water in the water storage tank (22) comes from a process water system, and the process water is connected to the water storage tank (22) through a hydraulic control valve and is controlled to be stable in water level by the hydraulic control valve;
the delivery outlet of the tail gas fan (5) is connected through a pipeline and sends the gas into SO2The gas inlet (211) of N1 at the lower part of the recovery and purification treatment tower (21) is used for conveying the gas to SO 2In the recovery purification treatment tower (21), water in a water storage tank (22) is sent to SO by a delivery pump2The purification treatment tower (21) is provided with an upper N3 liquid inlet (213), water enters from the upper N3 liquid inlet (213), under the action of a tower plate (215), the water is arranged into a multi-stage weir flow to turn back and forth and turn back down, the water reversely flows with the entering gas, under the impact action of gas flow in a weir flow section (216), a turbulent flow area with a large amount of mixed water drops, bubbles and water mist is formed, the descending speed is reduced, two-phase fluid fully contacts with the mass transfer in the area, the water absorbs SO in the gas2The liquid flows back to the water storage tank (22) from the N4 liquid outlet (214) at the lower part of the tower, and the purified gas is discharged from the N2 gas outlet (212) at the top of the tower, thus completing the whole purification treatment process.
Preferably, the acid making section (3) is the prior art of the company (the patent number is 201520339058.9), and comprises a water immersion cooler (31), a primary absorption tower (32), a secondary absorption tower (33) and a tertiary absorption unit (34) which are connected in sequence; the water absorbs SO in the gas2After flowing back to the water storage tank (22), the water is simultaneously sent to a water immersion cooler (31), a primary absorption tower (32) and a secondary absorption tower (33) of an acid making section by a delivery pump to make sulfurous acid, and acid liquor outlets arranged at the lower parts of the water immersion cooler (31), the primary absorption tower (32) and the secondary absorption tower (33) are connected with a sulfurous acid storage tank (41).
Furthermore, the water immersion cooler (31) is connected with a sulfur burning device (35), the sulfur burning device (35) can automatically adjust the output of sulfur dioxide by controlling the feeding amount of the spiral feeder and the working condition of the sulfur burning furnace through a controller, the output of sulfur dioxide is stable, the sulfur dioxide is absorbed by three levels, the absorption efficiency is high, the exhaust gas hardly contains sulfur dioxide, and the atmosphere is not polluted; the absorption rate of sulfur dioxide is high, and the usage amount of sulfur is saved.
The sulfur dioxide gas is cooled by a water immersion cooler (31), and then is absorbed by a two-stage absorption tower, and enters a three-stage absorption unit (34) for absorption, and then exhaust gas is discharged.
When water is conveyed to the acid making working section (3) and the water level in the water storage tank (22) is lowered, the hydraulic control valve automatically increases the opening degree, the same water quantity as that conveyed is put in, the water level is maintained stable, and the SO in the water is kept2Concentration difference of contents SO as to facilitate SO2The absorption of the device can not generate large fluctuation, thereby ensuring the normal operation.
Preferably, the sulfurous acid storage and reuse unit (4) is used for connecting the sulfurous acid produced by the acid production section (3) with a sulfurous acid storage tank (41), and an outlet of the sulfurous acid storage tank (41) leads to the acid utilization section to realize reuse.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (1)
1. SO recycled from tail gas in starch production process2The acid making system is characterized in that: comprises SO connected in sequence from the beginning to the end2The device comprises a gas collection unit, a purification treatment unit, an acid making working section and a sulfurous acid storage and re-application unit;
the SO2The gas collecting unit is formed by connecting a soaking tank of a soaking section with gas possibly escaping, a pressure curved sieve, an intermediate storage tank, a gravity curved sieve and a screening washing tank of a crushing, grinding and screening section by pipelines and connecting the pressure curved sieve, the intermediate storage tank, the gravity curved sieve and the screening washing tank with an inlet of a tail gas fan;
the purification treatment unit comprises SO2A recovery purification treatment tower (21) and a water storage tank (22);
the acid making section comprises a water immersion cooler, a primary absorption tower, a secondary absorption tower and a tertiary absorption unit which are connected in sequence; the water absorbs SO in the gas2After flowing back to the water storage tank, the water is simultaneously sent to a water immersion cooler, a primary absorption tower and a secondary absorption tower of an acid making section by a delivery pump to make sulfurous acid, and acid liquor outlets are arranged at the lower parts of the water immersion cooler, the primary absorption tower and the secondary absorption tower and are connected with a sulfurous acid storage tank;
The sulfurous acid storage and reuse unit is characterized in that sulfurous acid produced by an acid making section is connected with a sulfurous acid storage tank, and an outlet of the sulfurous acid storage tank is communicated to an acid using section to realize reuse;
the water in the water storage tank comes from a process water system, and the process water is connected to the water storage tank through a hydraulic control valve and is controlled to be stable in water level by the hydraulic control valve;
the delivery outlet of the tail gas fan is connected through a pipeline and sends the gas into SO2The N1 gas inlet at the lower part of the recovery and purification treatment tower conveys the gas to SO2The water in the water storage tank in the recovery and purification treatment tower is pumped to SO by a delivery pump2The water enters from the liquid inlet N3 at the upper part of the purification treatment tower, is arranged into a multistage weir flow to turn back and forth under the action of a tower plate and reversely flows with the entering gas, a turbulent flow area where water drops, bubbles and water mist are mixed is formed in a weir flow section under the impact action of gas flow, the descending speed is reduced, two-phase fluid fully contacts with the mass transfer in the area, and the water absorbs SO in the gas2The purified gas is discharged from an N2 gas outlet at the top of the tower, and the whole purification treatment process is finished;
the water immersion cooler is connected with a sulfur burning device, the sulfur burning device can automatically adjust the output of sulfur dioxide by controlling the feeding amount of the spiral feeder and the working condition of the sulfur burning furnace through a controller, the output of the sulfur dioxide is stable, and the sulfur dioxide is absorbed by three stages;
When water is delivered to an acid making working section and the water level in the water storage tank drops, the opening of the hydraulic control valve is automatically increased, the same water quantity as that delivered is put in, and the water level is kept stable.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710073041.7A CN106731524B (en) | 2017-02-10 | 2017-02-10 | Acid making system for recycling SO2 from tail gas in starch production process |
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| CN201710073041.7A CN106731524B (en) | 2017-02-10 | 2017-02-10 | Acid making system for recycling SO2 from tail gas in starch production process |
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| CN106731524A CN106731524A (en) | 2017-05-31 |
| CN106731524B true CN106731524B (en) | 2022-07-15 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB286289A (en) * | 1927-03-03 | 1929-01-24 | Corn Prod Refining Co | Improvements in manufacture of starch |
| WO1987002269A1 (en) * | 1985-10-11 | 1987-04-23 | Hoelter Heinz | Process for simultaneous extraction of so2 and nox contained in waste gases |
| CN101823694A (en) * | 2010-05-06 | 2010-09-08 | 杭州四面体科技有限公司 | Processing method for purifying sulfur-containing chlorine hydride |
| CN101870736A (en) * | 2010-06-25 | 2010-10-27 | 中粮生化能源(榆树)有限公司 | Production method for controlling content of SO2 contained in starch without adding oxidants |
| CN103041683A (en) * | 2012-12-23 | 2013-04-17 | 菱花集团有限公司 | Dust removing and deodorization process and device for waste gas generated at starch production section |
| CN103554277A (en) * | 2013-09-29 | 2014-02-05 | 山东西王糖业有限公司 | Production improvement method for corn starch |
| CN203944284U (en) * | 2014-06-06 | 2014-11-19 | 肇庆焕发生物科技有限公司 | Waste scavenging device in a kind of starch production process |
| CN104944383A (en) * | 2015-05-25 | 2015-09-30 | 济南阜丰宏发机械有限公司 | Automatic sulfur furnace |
| CN104944382A (en) * | 2015-05-25 | 2015-09-30 | 济南阜丰宏发机械有限公司 | Closed multistage absorption system for preparing sulfurous acid from sulfur dioxide |
| CN105129746A (en) * | 2015-09-09 | 2015-12-09 | 茌平县明大化工有限公司 | Method for cleanly producing food additive sulfuric acid |
-
2017
- 2017-02-10 CN CN201710073041.7A patent/CN106731524B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB286289A (en) * | 1927-03-03 | 1929-01-24 | Corn Prod Refining Co | Improvements in manufacture of starch |
| WO1987002269A1 (en) * | 1985-10-11 | 1987-04-23 | Hoelter Heinz | Process for simultaneous extraction of so2 and nox contained in waste gases |
| CN101823694A (en) * | 2010-05-06 | 2010-09-08 | 杭州四面体科技有限公司 | Processing method for purifying sulfur-containing chlorine hydride |
| CN101870736A (en) * | 2010-06-25 | 2010-10-27 | 中粮生化能源(榆树)有限公司 | Production method for controlling content of SO2 contained in starch without adding oxidants |
| CN103041683A (en) * | 2012-12-23 | 2013-04-17 | 菱花集团有限公司 | Dust removing and deodorization process and device for waste gas generated at starch production section |
| CN103554277A (en) * | 2013-09-29 | 2014-02-05 | 山东西王糖业有限公司 | Production improvement method for corn starch |
| CN203944284U (en) * | 2014-06-06 | 2014-11-19 | 肇庆焕发生物科技有限公司 | Waste scavenging device in a kind of starch production process |
| CN104944383A (en) * | 2015-05-25 | 2015-09-30 | 济南阜丰宏发机械有限公司 | Automatic sulfur furnace |
| CN104944382A (en) * | 2015-05-25 | 2015-09-30 | 济南阜丰宏发机械有限公司 | Closed multistage absorption system for preparing sulfurous acid from sulfur dioxide |
| CN105129746A (en) * | 2015-09-09 | 2015-12-09 | 茌平县明大化工有限公司 | Method for cleanly producing food additive sulfuric acid |
Non-Patent Citations (1)
| Title |
|---|
| 玉米淀粉湿法生产工艺研究;邱红星等;《食品科技》;20151220(第12期);全文 * |
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