CN101569823B - Method for recycling hydrochloric acid pickling waste gas - Google Patents
Method for recycling hydrochloric acid pickling waste gas Download PDFInfo
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- CN101569823B CN101569823B CN2009100339151A CN200910033915A CN101569823B CN 101569823 B CN101569823 B CN 101569823B CN 2009100339151 A CN2009100339151 A CN 2009100339151A CN 200910033915 A CN200910033915 A CN 200910033915A CN 101569823 B CN101569823 B CN 101569823B
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Abstract
The invention relates to the technical field of treating hydrochloric acid pickling waste liquid-gas, in particular to a method for recycling dilute hydrochloric acid from the hydrochloric acid pickling waste liquid-gas. The method generally comprises a process of progressively downstream hydrochloric acid pickling waste gas produced by pickling lines, a process of allowing absorption liquid to progressively flow back and a process of blending and recycling. The method has the advantages that the method can recycle HCL available resources in the pickling waste gas, recover and prepare the HCL available resources into the dilute hydrochloric acid and return the dilute hydrochloric acid to production lines so as to avoid the waste of resources, and compared with a lye-spraying method, the method avoids consuming a large amount of medicament cost and has obvious economic benefit. As treated clean air is returned to the production lines as blasts so as to realize the zero-emission closed cycle of the whole waste gas treatment, waste-gas emission chimneys no longer need to be arranged outside the production lines, thus the method has strong significance for environmental protection.
Description
Technical field
The present invention relates to the hydrochloric acid pickling waste liquor technical field of waste gas treatment, particularly a kind of method that from hydrochloric acid pickling waste liquor waste gas, reclaims watery hydrochloric acid.
Background technology
Pickling is one important procedure in the Treatment of Metal Surface.Because hydrochloric acid has severe corrosive, under the hot conditions nearly all metal all can with its generation chemical reaction.Therefore, the pickling industry of China adopts hydrochloric acid as the oxide layer of pickling medium with the removal metal surface mostly.Again because the strong volatility of hydrochloric acid tool, and pickling often needs carry out under higher temperature, has therefore more quickened the volatilization of hydrochloric acid.The acid solution of volatilization enters air, meets with airborne moisture and condenses, and forms tiny droplet.In addition, because chemical reaction has taken place, form a large amount of bubbles in Acidwash solution, the explosion to the liquid level of floating also can be taken acid drop out of.These acid droplets enter atmosphere, have just produced a large amount of chlorohydric acid pickling waste gas.
At present, domestic most of enterprises all adopt alkali lye spray absorption process to handle to chlorohydric acid pickling waste gas, promptly oxytropism waste gas carries out the alkali lye spray in spray column, the acidic materials in the waste gas is transferred in the spray absorption liquid, thereby but reaches the purpose that makes the final qualified discharge of waste gas purification.This method can be handled the acid ingredient in the chlorohydric acid pickling waste gas more up hill and dale, but also has following shortcoming: the consumption of (1) water and medicament alkali is very big, the heavy cost pressure that made enterprise's back; (2) easily produce secondary pollution.Usually in order to guarantee the clean-up effect of waste gas, can take the parlkaline spray, the liquid after therefore spray absorbs is generally understood meta-alkalescence, and still need further handle can qualified discharge; (3) losing recycling is worth.Adopt the alkali lye spray to absorb, wasted the recyclable resource hydrochloric acid that utilizes again in the waste gas, after the employing alkali lye neutralization reaction, hydrochloric acid loses the value of recycling, finally can only discharge, and has caused the serious wasting of resources; (4) still need set up the toxic emission chimney, be not good at, then still there is hidden danger in final discharging if handle.
Therefore, at above problem, the pickling industry urgently wishes to have a kind of investment and operating cost low, can realize that again processing method and device that the chlorohydric acid pickling waste gas circulation is recycled come out, not only can solve chlorohydric acid pickling treatment of waste gas handling problems, and can bring practical economic well-being of workers and staff to enterprise from environment protection significance.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can be absorbed as the HCL in the chlorohydric acid pickling waste gas liquid in watery hydrochloric acid and carry out recycling, can make pure air reuse to pickling workshop after the purification carry out method recycling and then that solve chlorohydric acid pickling treatment of waste gas handling problems, can bring the chlorohydric acid pickling waste gas circulation of practical economic well-being of workers and staff to recycle to enterprise from environment protection significance again.
According to technical scheme provided by the invention, the method that described chlorohydric acid pickling waste gas circulation is recycled comprises the steps:
The chlorohydric acid pickling waste gas that step 1, pickling line produce is introduced the spray absorber that is positioned at chopped-off head through blower fan, adopts the absorption liquid in the chopped-off head spray absorber accumulator tank to carry out the circulated sprinkling absorption in the absorption tower; The waste gas of chopped-off head spray absorber outlet enters the spray absorber of next stage, adopt the absorption liquid in this spray absorber accumulator tank to proceed the circulated sprinkling absorption, and following current step by step, the chlorohydric acid pickling waste gas following current that produces until pickling line is to the spray absorber that is positioned at final stage;
Step 2, the waste gas that is positioned at the spray absorber outlet of final stage enter gas-liquid separator, carry out gas-liquid separation, the pure air that separation obtains is back to pickling lines and blows, and sucked the spray absorber that is positioned at chopped-off head once more by blower fan, carry out circular treatment next time, liquid gas separates the absorption liquid that obtains and enters the adapted tank, and the water in the adapted tank is back to the spray absorber accumulator tank that is positioned at final stage, as the spray absorption liquid of final stage spray absorber;
Absorption liquid in step 3, the final stage spray absorber accumulator tank is back to upper level spray absorber accumulator tank, spray absorption liquid as this grade spray absorber, and reflux step by step, be back to the spray absorber that is positioned at chopped-off head until the spray absorption liquid, the absorption liquid of accumulator tank that is arranged in the spray absorber of chopped-off head enters the equipment of being mixed, after being mixed with pickling hydrochloric acid stoste, be back to the pickling lines reuse.
Each grade spray absorber below is equipped with the recovery spareslots, at spray absorber accumulator tank that is positioned at chopped-off head and recovery spareslots thereof acidometer is installed.The progression of spray absorber is secondary or more than the secondary.
The invention has the advantages that:
1, the recyclable HCL available resources that utilizes in the pickling waste gas, and reclaim and make watery hydrochloric acid, be back to production line, avoided the waste of resource.
2, compare with the alkali lye spray process, avoided the consumption of a large amount of reagent costs, have tangible economic benefit.
3, the pure air after the processing is back to production line as air-supply, makes whole exhaust-gas treatment realize the closed cycle of zero-emission, need not to set up outside production line the toxic emission chimney again, has very strong environment protection significance.
Description of drawings
Fig. 1 is that the present invention is to chlorohydric acid pickling treatment of waste gas flow chart.
The specific embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
The method that chlorohydric acid pickling waste gas circulation disclosed by the invention is recycled comprises the steps:
The chlorohydric acid pickling waste gas that step 1, pickling line produce is introduced the spray absorber that is positioned at chopped-off head through blower fan, adopts the absorption liquid in the chopped-off head spray absorber accumulator tank to carry out the circulated sprinkling absorption in the absorption tower; The waste gas of chopped-off head spray absorber outlet enters the next stage spray absorber, adopt the absorption liquid in this spray absorber accumulator tank to proceed the circulated sprinkling absorption, the following current step by step of chlorohydric acid pickling waste gas, the chlorohydric acid pickling waste gas following current that produces until pickling line is to the spray absorber that is positioned at final stage;
Step 2, the waste gas that is positioned at the spray absorber outlet of final stage enter gas-liquid separator, carry out gas-liquid separation, the pure air that separation obtains is back to pickling lines and blows, and sucked the spray absorber that is positioned at chopped-off head once more by blower fan, carry out circular treatment next time, liquid gas separates the absorption liquid that obtains and enters the adapted tank, and the water in the adapted tank is back to the spray absorber accumulator tank that is positioned at final stage, as the spray absorption liquid of final stage spray absorber;
Absorption liquid in step 3, the final stage spray absorber accumulator tank is back to upper level spray absorber accumulator tank, spray absorption liquid as this grade spray absorber, and reflux step by step, be back to the spray absorber that is positioned at chopped-off head until the spray absorption liquid, the absorption liquid of accumulator tank that is arranged in the spray absorber of chopped-off head enters the equipment of being mixed, after being mixed with pickling hydrochloric acid stoste, be back to the pickling lines reuse.
Each grade spray absorber below is equipped with the recovery spareslots, at spray absorber accumulator tank that is positioned at chopped-off head and recovery spareslots thereof acidometer is installed.The progression of spray absorber is secondary or more than the secondary.
Embodiment 1
The pickling waste gas that the chlorohydric acid pickling line produces enters chopped-off head spray absorber 2 under the effect of blower fan 1.In chopped-off head spray absorber 2, utilize circulated sprinkling pump 3, with the watery hydrochloric acid absorption liquid in the chopped-off head spray absorber accumulator tank 4, be promoted to chopped-off head spray absorber 2 tops, utilize HCL very easily to be dissolved in the characteristic of water, hydrochloric acid waste gas is sprayed absorption, and the absorption liquid that obtains is back to chopped-off head spray absorber accumulator tank 4.
Chopped-off head spray absorber 2 chlorohydric acid pickling treatment of waste gas efficient is about 80%, still have 20% hydrochloric acid waste gas to be untreated fully, so the outlet tail gas of chopped-off head spray absorber 2 enters secondary spray absorber 5 again.In secondary spray absorber 5, utilize circulated sprinkling pump 6, with the watery hydrochloric acid absorption liquid in the secondary recovery groove 7, be promoted to secondary spray absorber 5 tops, hydrochloric acid waste gas is carried out secondary spraying absorb, the absorption liquid that obtains is back to secondary recovery groove 7.
The tail gas of secondary spray absorber outlet enters gas-liquid separator 8, absorb residual a small amount of water smoke and acid mist in the tail gas, separate and obtain clean gas, being back to pickling lines blows, and can mix with the concentrated hydrochloric acid waste gas that production line produces, be sucked in the chopped-off head spray absorber 2 by blower fan 1, enter next circular treatment flow process.
Gas-liquid separator 8 separates the watery hydrochloric acid liquid that obtains and flows into adapted tank 9, and is back to secondary recovery groove 7, as the absorbent of secondary spray absorber 5.Watery hydrochloric acid in the secondary recovery groove 7 is after circulation absorbs, and concentration can reach 2%～3%.
Watery hydrochloric acid in the secondary recovery groove 7 is back to chopped-off head spray absorber accumulator tank 4, as the absorbent of chopped-off head spray absorber 2.Watery hydrochloric acid in the chopped-off head spray absorber accumulator tank 4 is after circulation absorbs, and concentration can reach 8%～10%.
Watery hydrochloric acid in the chopped-off head spray absorber accumulator tank 4 is sent into blending device 10 after acidometer 11 detectable concentrations reach regulation and require, be mixed with 33% concentrated hydrochloric acid, and concentration of hydrochloric acid is reached about 25%, delivers to the pickling lines reuse.
Claims (2)
1. the method that the chlorohydric acid pickling waste gas circulation is recycled is characterized in that this method comprises the steps:
The chlorohydric acid pickling waste gas that step 1, pickling line produce is introduced the spray absorber that is positioned at chopped-off head through blower fan, adopts the absorption liquid in the chopped-off head spray absorber accumulator tank to carry out the circulated sprinkling absorption in the absorption tower; The waste gas of chopped-off head spray absorber outlet enters the next stage spray absorber, utilize the absorption liquid in the described next stage spray absorber accumulator tank to proceed the circulated sprinkling absorption, and following current step by step, the chlorohydric acid pickling waste gas following current that produces until pickling line is to the spray absorber that is positioned at final stage;
Step 2, the waste gas of outlet that is positioned at the spray absorber of final stage enter gas-liquid separator, carry out gas-liquid separation, the pure air that separation obtains is back to pickling lines and blows, and sucked the spray absorber that is positioned at chopped-off head once more by blower fan, carry out circular treatment next time, liquid gas separates the absorption liquid that obtains and enters the adapted tank, and the water in the adapted tank is back to the spray absorber accumulator tank that is positioned at final stage, as the spray absorption liquid of final stage spray absorber;
Absorption liquid in step 3, the final stage spray absorber accumulator tank is back to upper level spray absorber accumulator tank, spray absorption liquid as this grade spray absorber, and reflux step by step, be back to the spray absorber that is positioned at chopped-off head until the spray absorption liquid, the absorption liquid of accumulator tank that is arranged in the spray absorber of chopped-off head enters the equipment of being mixed, after being mixed with pickling hydrochloric acid stoste, be back to the pickling lines reuse;
Each grade spray absorber below is equipped with the recovery spareslots, at spray absorber accumulator tank that is positioned at chopped-off head and recovery spareslots thereof acidometer is installed.
2. the method that chlorohydric acid pickling waste gas circulation according to claim 1 is recycled is characterized in that: the progression of spray absorber is secondary or more than the secondary.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100339151A CN101569823B (en) | 2009-05-27 | 2009-05-27 | Method for recycling hydrochloric acid pickling waste gas |
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| CN2009100339151A CN101569823B (en) | 2009-05-27 | 2009-05-27 | Method for recycling hydrochloric acid pickling waste gas |
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| CN101569823A CN101569823A (en) | 2009-11-04 |
| CN101569823B true CN101569823B (en) | 2011-06-15 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102198361B (en) * | 2011-05-19 | 2013-09-04 | 蒋超 | Hydrogen chloride tail gas recovery equipment |
| CN107406992B (en) * | 2015-02-16 | 2020-02-07 | 湖南斯瑞摩科技有限公司 | Pickling production line of magnesium alloy waste material and application thereof |
| CN105327594B (en) * | 2015-11-12 | 2018-05-18 | 中国石油化工股份有限公司青岛安全工程研究院 | Styrene waste gases processing unit |
| CN107670462A (en) * | 2017-10-28 | 2018-02-09 | 中航长沙设计研究院有限公司 | Surface-treatment line air draft EGR |
| CN108686483A (en) * | 2018-08-03 | 2018-10-23 | 丹阳市腾黄钢管镀锌有限责任公司 | A kind of acid mist processing equipment that efficient low-consume is Ke Xunhuanliyong |
| CN109621560A (en) * | 2019-01-13 | 2019-04-16 | 上海务宝智能装备有限公司 | A kind of acid regeneration tail gas clean-up and emission-reducing process and equipment |
| CN110075669A (en) * | 2019-05-29 | 2019-08-02 | 湖南长宏新能源材料有限责任公司 | A kind of purification treatment of nonferrous smelting HCl exhaust gas and recycle technique |
| CN110947275A (en) * | 2019-11-05 | 2020-04-03 | 莱芜钢铁集团电子有限公司 | Pickling line acid mist washing system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2562854Y (en) * | 2001-09-11 | 2003-07-30 | 朱竹庆 | Zero discharging chemical gas suction device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2562854Y (en) * | 2001-09-11 | 2003-07-30 | 朱竹庆 | Zero discharging chemical gas suction device |
Non-Patent Citations (2)
| Title |
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| JP特开2000-61261A 2000.02.29 |
| JP特开2006-320889A 2006.11.30 |
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Denomination of invention: Method for recycling hydrochloric acid pickling waste gas Effective date of registration: 20131224 Granted publication date: 20110615 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi science and Technology Branch Pledgor: WUXI XINGYI PAINTING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co.,Ltd. Registration number: 2013990001018 |
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Date of cancellation: 20150115 Granted publication date: 20110615 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi science and Technology Branch Pledgor: WUXI XINGYI PAINTING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co.,Ltd. Registration number: 2013990001018 |
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Address after: 214153 Jiangsu city of Wuxi province Huishan Qianqiao Outang Dongfeng Industrial Park Patentee after: WUXI XINGYI INTELLIGENT ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. Address before: 214153 Jiangsu city of Wuxi province Huishan Qianqiao Outang Dongfeng Industrial Park Patentee before: WUXI XINGYI INTELLIGENT ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. |
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| CP03 | Change of name, title or address |
Address after: 214153 Jiangsu city of Wuxi province Huishan Qianqiao Outang Dongfeng Industrial Park Patentee after: WUXI XINGYI INTELLIGENT ENVIRONMENTAL PROTECTION EQUIPMENT CO.,LTD. Address before: 214153 Jiangsu Province, Wuxi city Huishan District Outang Dongfeng Industrial Park Wuxi Xingyi coating environmental protection equipment Co. Patentee before: WUXI XINGYI PAINTING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co.,Ltd. |