CN104787724A - Method for removing red smoke discharged from acid regeneration device - Google Patents
Method for removing red smoke discharged from acid regeneration device Download PDFInfo
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- CN104787724A CN104787724A CN201510180319.1A CN201510180319A CN104787724A CN 104787724 A CN104787724 A CN 104787724A CN 201510180319 A CN201510180319 A CN 201510180319A CN 104787724 A CN104787724 A CN 104787724A
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Abstract
The invention discloses a method for removing red smoke discharged from an acid regeneration device, and solves the problem that the conventional acid regeneration device discharges red smoke. The method comprises the following steps: (1) before the acid water conversion operation is performed, regenerated acid is introduced in a preconcentrator, and iron oxide powder in roaster gas is absorbed by the regenerated acid; (2) after the concentration of free acid in the preconcentrator is up to above 14%, the introducing of the regenerated acid is stopped, waste acid or rinse water is introduced, and the normal acid operation or water operation is performed. Through the adoption of the method, dust in roaster exhaust gas emission can be guaranteed to reach the standard, so that the red smoke discharging is avoided.
Description
Technical field
The present invention relates to and a kind ofly eliminate the method that acid regeneration device emits red cigarette.
Background technology
In cold-rolling pickling factory, when using acid pickling steel plate with hydrochloric acid, the ferric oxide of plate surface is fallen to be formed iron protochloride by chlorohydric acid pickling or iron(ic) chloride is dissolved in pickle solution, along with the iron concentration carried out in pickle solution of acid cleaning process can raise, and the corresponding reduction of concentration of free HCl.In order to keep the concentration of the free HCl in pickling acid solution, the iron ion increased in removing acid solution, returns the acid regeneration device regeneration free acid that is sent to quantitative for spent acid solution to pickling unit, obtains brown iron oxide simultaneously.Regeneration of hydrochloric acid unit is corrosion and the pollution of eliminating spent acid, waste acid water and acid vapour, the environmental protection facility turned bane into boon.Acid recovery plant not only can reclaim hydrochloric acid, can also generate byproduct ferric oxide, and brown iron oxide can be used as the high purity ferric oxide of soft magnetic materials.
Waste hydrochloric acid regeneration device is widely used in the regeneration of the cold rolling front sheet material acid-washing waste acid of steel industry, total running gear about 200 cover in the whole nation, but the phenomenon of " red cigarette " is emitted in appearance all in various degree, particularly can continue in the process of sour water conversion operations 30 ~ 60 minutes emit " red cigarette " phenomenon.
Acid regeneration device roaster tail gas exhaust temperature is 75 ~ 85 DEG C, and Theoretical Calculation HCl emission concentration is about 21mg/Nm
3if misoperation or device break down, emission concentration can easily exceed the 30mg/Nm of discharging standards GB28665-2012 " steel rolling industrial atmosphere pollutant emission standard " defined
3.
Summary of the invention
The object of the present invention is to provide and a kind ofly eliminate the method that acid regeneration device emits red cigarette, solve the problem that existing acid regeneration device emits " red cigarette " phenomenon.
To achieve these goals, the technical solution used in the present invention is as follows:
Eliminate the method that acid regeneration device emits red cigarette, comprise the following steps:
(1) before carrying out sour water conversion operations, in preconcentrator, pass into regenerating acid, absorb the brown iron oxide in roaster gas by regenerating acid;
(2) reach after more than 14% until free acid concentration in preconcentrator, stop passing into regenerating acid, change into and pass into spent acid or rinse water, carry out normal acid operation or water operation.
Further, described free acid concentration refers to HCl concentration.
Again further, in described regenerating acid, HCl concentration is 18%.
Preferred as one, in described step (2) preconcentrator, free acid concentration answers >=14.21%.
The reason of Mao Hongyan is: roaster gas directly enters absorption tower after preconcentrator equipment, absorbs HCl gas wherein and form regenerating acid by absorption tower.In this flow process, the brown iron oxide after preconcentrator is less than μm, in sour water Conversion Project, concentration of hydrochloric acid step-down in preconcentrator and absorption tower, superfine brown iron oxide wherein cannot be disposed, cause the brown iron oxide in emptying flue gas to exceed standard, occur " red cigarette " phenomenon.But regenerating acid is mainly caused (the original medium that enters of preconcentrator is spent acid, rinse water) among preconcentrator by the present invention, by controlling acid and turn water or water turning sour process, up to standard to ensure the dust in roaster tail gas discharge, avoid emitting red cigarette phenomenon.Regenerating acid in access to plant again forms regenerating acid and enters regenerating acid tank forming HCl in stoving oven after absorption tower absorbs, and can not cause the loss of regenerating acid.The trickle brown iron oxide in roaster tail gas is removed mainly through chemical reaction.Before sour water conversion operations, change the spent acid (or rinse water) entering preconcentrator into regenerating acid, circulation fluid HCl concentration is reached after more than 14%, be adjusted to rinse water (or spent acid) and circulate.
The present invention compared with prior art, has the following advantages and beneficial effect:
Regenerating acid is caused (the original medium that enters of preconcentrator is spent acid, rinse water) among preconcentrator by the present invention, turns water or water turns sour process by time variable control acid, up to standard to ensure the dust in roaster tail gas discharge, avoids emitting red cigarette phenomenon.The roaster tail gas of abundant guarantee discharge reaches " steel rolling industrial atmosphere pollutant emission standard " GN28665-2012 of national up-to-date promulgation.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of regenerating unit in prior art.
Fig. 2 is the process flow sheet of regenerating unit of the present invention.
Fig. 3 is process flow sheet of the present invention.
Fig. 4 is preconcentrator HCl change in concentration figure in water operation transformation to sour operating process.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
Acid regeneration device emits the phenomenon of red cigarette mainly to occur in acid regeneration device when carrying out sour water conversion operations, is generally 30 ~ 60 minutes, when acid regeneration is in sour operational stage completely, emits red cigarette phenomenon to disappear.Major cause is that the free acid concentration in thickener is lower.
As shown in Figure 4, supplement acid solution Σ HCl concentration analyze preconcentrator, preconcentrator adds to normal running liquid level required time from minimum liquid level and is: 33.94 minutes, now in preconcentrator, Σ HCl concentration was 11.91%.Σ HCl concentration after 60 minutes in preconcentrator is 14.21%.When 30 minutes, in preconcentrator, Σ HCl concentration is 11.39%.
Along with the prolongation of time, in preconcentrator, the increasing amount of Σ HCl concentration can be fewer and feweri.After 60 minutes, concentration increasing amount has been less than per minute 0.05%.According to operating experience in the past, red cigarette phenomenon is emitted to occur between 30 ~ 60 minutes.For thoroughly stopping the generation of emitting red cigarette phenomenon, then when conversion operations, in preconcentrator, the concentration of free HCl should ensure to be more than or equal to 14.21%.
As shown in Figure 1, 2, the present embodiment provides a kind of and eliminates the method that acid regeneration device emits red cigarette, the optimized integration of the method is: before sour water conversion, a certain amount of regenerating acid is passed in preconcentrator, make the free HCl concentration in preconcentrator reach more than 14.21%, thus avoid acid regeneration device to emit red cigarette.
To have the present invention to make those skilled in the art and understand more clearly and be familiar with, be described in detail below:
Water operates: adopt before device carries out acid operation, be mainly baker temperature rise period and rinse water operational phase.Now, preconcentrator adopts rinse water to carry out cyclical operation.
Spent acid operates: when device acid operation is normal, preconcentrator adopts spent acid to circulate.First the spent acid provided by spent acid pump enters preconcentrator after waste acid filter, carries out liquid level and supplements (magnitude of recruitment is spent acid treatment capacity).The input and output amount of spent acid is controlled by preconcentrator liquid level.
Regenerating acid operates: before carrying out sour water conversion operations, and first to the acid of preconcentrator compensation regeneration, in T minute, the HCl concentration in preconcentrator circulation fluid is brought up to about 14% by (initial set value 60 minutes).
As shown in Figure 3, specific operation process is as follows:
Normal production operation process: 1. spent acid enters preconcentrator (now variable valve 2., 3. variable valve cut out) through variable valve.
Turn in sour operating process in water operation: first open variable valve 2. (now variable valve 1., 3. variable valve cut out) regenerating acid is introduced in preconcentrator, in regenerating acid, iron ion is less, at the Fe that roasting reaction in furnace generates
2o
3dust is little, can be absorbed by preconcentrator.After free acid concentration is greater than 14% in preconcentrator (time T is initially 60 minutes), close variable valve 2., open variable valve and 1. introduce spent acid, enter normal spent acid operational stage.
In acid operation patent procedure process: open variable valve 2. (now regulate 1., variable valve 3. close) regenerating acid is introduced in preconcentrator, preconcentrator internal recycle spent acid solution can reduce gradually because of the introducing iron concentration of regenerating acid, and free acid concentration can raise gradually, Fe in rectification acid purification system
2o
3dust also can reduce gradually, after preconcentrator circulating liquid free acid concentration is greater than 14% (time T is initially 60 minutes), close variable valve 2., open variable valve 3. supplement rinse water, be transformed into water operation.
The present invention by the brown iron oxide basic absorption in preconcentrator, thus can prevent the phenomenon emitting red cigarette.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical problem, even if some making on the invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (4)
1. eliminate the method that acid regeneration device emits red cigarette, it is characterized in that, comprise the following steps:
(1) before carrying out sour water conversion operations, in preconcentrator, pass into regenerating acid, absorb the brown iron oxide in roaster gas by regenerating acid;
(2) reach after more than 14% until free acid concentration in preconcentrator, stop passing into regenerating acid, change into and pass into spent acid or rinse water, carry out normal acid operation or water operation.
2. according to claim 1ly a kind ofly eliminate the method that acid regeneration device emits red cigarette, it is characterized in that, described free acid concentration refers to HCl concentration.
3. according to claim 2ly a kind ofly eliminate the method that acid regeneration device emits red cigarette, it is characterized in that, in described regenerating acid, HCl concentration is 18%.
4. according to claim 1ly a kind ofly eliminate the method that acid regeneration device emits red cigarette, it is characterized in that, in described step (2) preconcentrator, free acid concentration should >=14.21%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510180319.1A CN104787724A (en) | 2015-04-16 | 2015-04-16 | Method for removing red smoke discharged from acid regeneration device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510180319.1A CN104787724A (en) | 2015-04-16 | 2015-04-16 | Method for removing red smoke discharged from acid regeneration device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2880793Y (en) * | 2006-03-14 | 2007-03-21 | 鞍山瑞野实业有限公司 | Hydrochloric acid regenerating device |
| CN101654224A (en) * | 2008-08-20 | 2010-02-24 | 成都华西化工科技股份有限公司 | Method for regeneration of waste hydrochloric acid by oxygen enriched roasting |
| CN103668269A (en) * | 2013-12-12 | 2014-03-26 | 成都华西化工科技股份有限公司 | Process for eliminating red fume discharged from waste acid regenerating device |
-
2015
- 2015-04-16 CN CN201510180319.1A patent/CN104787724A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2880793Y (en) * | 2006-03-14 | 2007-03-21 | 鞍山瑞野实业有限公司 | Hydrochloric acid regenerating device |
| CN101654224A (en) * | 2008-08-20 | 2010-02-24 | 成都华西化工科技股份有限公司 | Method for regeneration of waste hydrochloric acid by oxygen enriched roasting |
| CN103668269A (en) * | 2013-12-12 | 2014-03-26 | 成都华西化工科技股份有限公司 | Process for eliminating red fume discharged from waste acid regenerating device |
Non-Patent Citations (1)
| Title |
|---|
| 赵生军等: "再生酸回用技术在酸再生机组消除"红烟"中的探索与实践", 《2014年全国冶金能源环保生产技术会文集 》 * |
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Application publication date: 20150722 |