CN105642074A - Single-conversion single-absorption acid making process for low-concentration sulfur-bearing flue gas - Google Patents

Single-conversion single-absorption acid making process for low-concentration sulfur-bearing flue gas Download PDF

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Publication number
CN105642074A
CN105642074A CN201410626050.0A CN201410626050A CN105642074A CN 105642074 A CN105642074 A CN 105642074A CN 201410626050 A CN201410626050 A CN 201410626050A CN 105642074 A CN105642074 A CN 105642074A
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China
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gas
less
flue gas
concentration
acid
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CN201410626050.0A
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Chinese (zh)
Inventor
张明朗
彭晖
谈正年
付双成
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JIANGSU QINGFENG INTERNATIONAL ENVIRONMENTAL ENGINEERING Co Ltd
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JIANGSU QINGFENG INTERNATIONAL ENVIRONMENTAL ENGINEERING Co Ltd
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Priority to CN201410626050.0A priority Critical patent/CN105642074A/en
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Abstract

The invention relates to a single-conversion single-absorption acid making process for low-concentration sulfur-bearing flue gas. The desulfurization acid making process comprises treatment of smelting flue gases of two channels and comprises the following specific steps: (1) carrying out first-time desulfurization on the smelting flue gases of a first channel, and subjecting the flue gases to absorption and desorption, so as to produce high-concentration SO2 gas; (2) mixing the SO2 gas, obtained after carrying out desulfurizing treatment on the first channel, with the smelting flue gases of a second channel, wherein the concentration of the SO2 gas in the mixed flue gas is increased to 5%; (3) carrying out single-conversion single-absorption contact method acid making treatment on the flue gas obtained in the step (2); and (4) carrying out second-time desulfurization stage treatment on exhaust gas treated in the step (3). According to the process, the cost is reduced, the process is simple, safe and environment-friendly, the comprehensive utilization ratio is high, the emission of SO2 can be greatly lowered, and the final SO2 emission reduction effect is equivalent to that of double-conversion double-absorption processing equipment; the mounting cost is low, the process is simple, and automated control is easy to realize; produced dilute acid can be recycled to control the concentration of circulating acid of a sulfuric acid device; and an exhaust gas washing device is not subjected to additional pressure.

Description

A kind of one turn of one absorption acid-making process of low concentration sulfur-containing smoke gas
Technology field
The present invention relates to a kind of flue gas during smelting and purify technique, particularly relate to a kind of one turn of one absorption acid-making process of low concentration sulfur-containing smoke gas.
Background technique
China is one of country based on coal of primary energy consumption in the world, and in China's primary energy consumption in 2000, the ratio of coal is 63%, and same time world average level is 25%. Energy consumption structure based on coal causes that a large amount of SO2 discharges, particularly thermal power generation and metal smelt industry, and the discharge capacity of SO2 is big and concentrates. China SO2 discharge in 2000 is 19,950,000 tons, ranks first in the world. At present, great majority are smelted producer and are adopted advanced smelting process, improve SO2 concentration of flue gas (concentration is more than 2.5%), can directly with conventional contact method technique antacid. But, China still has the smelting devices such as some middle-size and small-size lead, zinc, copper, nickel, molybdenums or adopts the smelting process comparatively fallen behind, or the sulfur content of raw material own is low so that SO2 concentration of flue gas is relatively low and undulate quantity is big, it is difficult to process with conventional acid-making process.
In recent years, many thermal power plants and Nonferrous Enterprises are done a lot of work in the purified treatment of low concentration SO2 fume, and from " end treatment " to " effecting a permanent cure " transition, and effect is but and inconspicuous. What now put into production has traditional ammonia process, alkaline process, calcium method, Jian Shi aluminum sulfate, gypsum, zinc oxide method, manganese absorption process, active carbon adsorption etc. But due to these methods Shortcomings in the supply of absorbent, the market of side-product and technology process, can only unilaterally solve the SO2 pollution caused, comprehensive benefit is poor, enforcement brings again the problems such as production cost increase, therefore, the method that many factories of current China still take directly discharge. The pollution of air is remained a headachy difficult problem together by industry SO2. At present, the discharge of China low concentration SO2 fume not only results in about a large amount of Sulphur ressource and loses in vain, goes back severe contamination ecological environment, wherein only the industry such as thermoelectricity, smelting concentrate scale discharge just more than 4,000,000 tons. But China is again the country that Sulphur ressource lacks relatively simultaneously, a large amount of imported sulphur carry out antacid in recent years, and import in 2002 reaches 4,000,000 tons, add upper inlet phosphate fertilizer (by its consumption sulphuric acid conversion) and have been equivalent to imported sulphur 5,000,000 tons.China is in a large amount of imported sulphur on the one hand, and substantial amounts of low concentration SO 2 is running off on the other hand, and environment causes extreme influence, the health of the infringement people. Therefore, how to process low concentration SO2 fume, reach both to comprehensively utilize Sulphur ressource, eliminate again the purpose of environmental pollution, there is important practical significance.
At present that flue gas desulfurization research is more, it is in progress also very fast; But low concentration SO2 fume desulfurization is faced two hang-ups: one be that exhaust gas volumn is very big and when SO2 concentration is extremely low (general��0.5%) commercial recovery SO2 extremely uneconomical, two is use conventional sulfur method to carry out the relatively costly of desulfurization and effect is also unstable. Therefore, the parameter that desulfurization is closed reaction is analyzed comparing, and selects out the scheme that desulfuration efficiency height, operating cost is low, comprehensive utilization is made good use of very necessary.
Summary of the invention
The present invention is to solve problem above provide a kind of save cost, technique is simple, safety and environmental protection, comprehensive utilization ratio are high one turn of one absorption acid-making process of low concentration sulfur-containing smoke gas.
The process program of the present invention is: described desulfurization acid-making process includes the process of two-way flue gas during smelting, specifically comprises the following steps that
1) first via flue gas during smelting carries out first time desulfurization, and flue gas is through the SO of absorption, desorbing output high concentration2Gas;
2) SO after first via desulfurization being processed2Gas mixes to the second road flue gas during smelting, SO in mixed flue gas2Gas concentration is increased to 5%;
3) by above-mentioned steps 2) flue gas carry out one turn of one suction touch legal system acid treatment;
4) tail gas after step 3) being processed carries out second time desulfurization staged care, and coagulation removes SO2Gas, SO after process2Gas is less than 100mg/m3; Two stage treatment removes NO and SO2Gas, SO after process2Gas is less than 50mg/m3, NO is less than 100mg/m3; Tertiary treatment removes CO2��NO��SO2Gas, tail gas SO after process2Gas is less than 1mg/m3, NO is less than 50mg/m3, CO2Content is less than 1%; Level Four processes except Hg, tail gas SO after process2Gas is less than 1mg/m3, NO is less than 50mg/m3, CO2Content is less than 1%, and Hg is less than 5ug/m3��
The present invention saves cost, technique is simple, safety and environmental protection, comprehensive utilization ratio high, the flue gas during smelting that originally can not meet contact method antacid requirement is become can the flue gas of antacid, and relatively conventional flow process reduces energy consumption, operating cost and investment, can be substantially reduced SO2Discharge capacity, final SO2Emission reduction effect is suitable with double conversion double absorption process unit, and its mounting cost is low, and technique is simple, it is easy to accomplish Automated condtrol, and the diluted acid of generation reuse can control sulfuric acid apparatus recycle acid concentration, and washing tail gas device does not produce extra pressure.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Fig. 2 is one turn of one absorption acid-making process flow chart.
Detailed description of the invention
A kind of one turn of one absorption acid-making process of low concentration sulfur-containing smoke gas, described desulfurization acid-making process includes the process of two-way flue gas during smelting, specifically comprises the following steps that
1) first via flue gas during smelting carries out first time desulfurization, and flue gas is through the SO of absorption, desorbing output high concentration2Gas;
2) SO after first via desulfurization being processed2Gas mixes to the second road flue gas during smelting, SO in mixed flue gas2Gas concentration is increased to 5%;
3) by above-mentioned steps 2) flue gas carry out one turn of one suction touch legal system acid treatment;
4) tail gas after step 3) being processed carries out second time desulfurization staged care, and coagulation removes SO2Gas, SO after process2Gas is less than 100mg/m3;Two stage treatment removes NO and SO2Gas, SO after process2Gas is less than 50mg/m3, NO is less than 100mg/m3; Tertiary treatment removes CO2��NO��SO2Gas, tail gas SO after process2Gas is less than 1mg/m3, NO is less than 50mg/m3, CO2Content is less than 1%; Level Four processes except Hg, tail gas SO after process2Gas is less than 1mg/m3, NO is less than 50mg/m3, CO2Content is less than 1%, and Hg is less than 5ug/m3��
It addition, be additionally provided with waste heat boiler at conversion section to reclaim heat production steam more than needed.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described. The technologist of the industry it should be recognized that; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within the claimed scope of the invention. Claimed scope is defined by appending claims and equivalent thereof.

Claims (1)

1. one turn of one absorption acid-making process of a low concentration sulfur-containing smoke gas, it is characterised in that: described desulfurization acid-making process includes the process of two-way flue gas during smelting, specifically comprises the following steps that
1) first via flue gas during smelting carries out first time desulfurization, and flue gas is through the SO of absorption, desorbing output high concentration2Gas;
2) SO after first via desulfurization being processed2Gas mixes to the second road flue gas during smelting, SO in mixed flue gas2Gas concentration is increased to 5%;
3) by above-mentioned steps 2) flue gas carry out one turn of one suction touch legal system acid treatment;
4) tail gas after step 3) being processed carries out second time desulfurization staged care, and coagulation removes SO2Gas, SO after process2Gas is less than 100mg/m3; Two stage treatment removes NO and SO2Gas, SO after process2Gas is less than 50mg/m3, NO is less than 100mg/m3; Tertiary treatment removes CO2��NO��SO2Gas, tail gas SO after process2Gas is less than 1mg/m3, NO is less than 50mg/m3, CO2Content is less than 1%; Level Four processes except Hg, tail gas SO after process2Gas is less than 1mg/m3, NO is less than 50mg/m3, CO2Content is less than 1%, and Hg is less than 5ug/m3��
CN201410626050.0A 2014-11-10 2014-11-10 Single-conversion single-absorption acid making process for low-concentration sulfur-bearing flue gas Pending CN105642074A (en)

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CN201410626050.0A CN105642074A (en) 2014-11-10 2014-11-10 Single-conversion single-absorption acid making process for low-concentration sulfur-bearing flue gas

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108046221A (en) * 2017-12-12 2018-05-18 中国恩菲工程技术有限公司 A kind of method of metallurgical off-gas acid-making

Citations (6)

* Cited by examiner, † Cited by third party
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CN1475435A (en) * 2003-06-06 2004-02-18 叶树滋 Method of producing sulfuric acid using ammonic acid method to concentrate low concentration sulfur dioxide gas
US20070122328A1 (en) * 2005-11-28 2007-05-31 Allam Rodney J Purification of carbon dioxide
CN101492154A (en) * 2009-02-12 2009-07-29 中国瑞林工程技术有限公司 Method for economically recycling sulphur dioxide from low-concentration or non-continuity flue gas to produce sulphuric acid
CN101745305A (en) * 2010-01-24 2010-06-23 华北电力大学(保定) Method for removing various gaseous pollutants from smoke gas
CN103303877A (en) * 2013-07-03 2013-09-18 中国瑞林工程技术有限公司 Comprehensive multi-gas source low-concentration SO2 fume recycling acid-making technological process
CN103768908A (en) * 2013-10-30 2014-05-07 上海龙净环保科技工程有限公司 Removal tower and technology for wet-type integration desulfurization, denitrification, demercuration and PM 2.5 removal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1475435A (en) * 2003-06-06 2004-02-18 叶树滋 Method of producing sulfuric acid using ammonic acid method to concentrate low concentration sulfur dioxide gas
US20070122328A1 (en) * 2005-11-28 2007-05-31 Allam Rodney J Purification of carbon dioxide
CN101492154A (en) * 2009-02-12 2009-07-29 中国瑞林工程技术有限公司 Method for economically recycling sulphur dioxide from low-concentration or non-continuity flue gas to produce sulphuric acid
CN101745305A (en) * 2010-01-24 2010-06-23 华北电力大学(保定) Method for removing various gaseous pollutants from smoke gas
CN103303877A (en) * 2013-07-03 2013-09-18 中国瑞林工程技术有限公司 Comprehensive multi-gas source low-concentration SO2 fume recycling acid-making technological process
CN103768908A (en) * 2013-10-30 2014-05-07 上海龙净环保科技工程有限公司 Removal tower and technology for wet-type integration desulfurization, denitrification, demercuration and PM 2.5 removal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108046221A (en) * 2017-12-12 2018-05-18 中国恩菲工程技术有限公司 A kind of method of metallurgical off-gas acid-making

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