CN1385364A - Preparation of high-concntration surlfuric acid using hydrogen sulfide contained acidic gas - Google Patents
Preparation of high-concntration surlfuric acid using hydrogen sulfide contained acidic gas Download PDFInfo
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- CN1385364A CN1385364A CN 02137839 CN02137839A CN1385364A CN 1385364 A CN1385364 A CN 1385364A CN 02137839 CN02137839 CN 02137839 CN 02137839 A CN02137839 A CN 02137839A CN 1385364 A CN1385364 A CN 1385364A
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Abstract
The present invention is applicable to treatment of acidic gas containing hydrogen sulfide produced in the synthetic ammonia, petroleum chemical and coking chemical industries, and includes the following steps: making said gas containing hydrogen sulfide undergo the processes of combustion, cooling and demisting, and feed into drying circulating system, using sulfuric acid to remove water content; making the furnace gas containing sulfur dioxide pass through heat-exchange equipment and be heated, then feeding said gas into conversion system to make first convertion to form sulfur trioxide; using sulfuric acid to absorb sulfur trioxide from gas and making secondary conversion to quickly convert the sulfur dioxide into sulfur trioxide, then using sulfuric acid to absorb sulfur trioxide from gas and discharge standard-reached gas.
Description
The technical field is as follows: the invention belongs to the technical field of environmental protection, and particularly relates to a method for preparing high-concentration sulfuric acid by utilizing acid gas containing hydrogen sulfide.
Background art: the techniques related to the present invention are:
CN1163858, a process for recovering sulfur from gas containing hydrogen sulfide, which recovers hydrogen sulfide into sulfur, and the present technology has the following three problems: a. the tail gas emission does not reach the standard. b. The running cost is high. c. The investment of the device is large.
CN1077433, condensation of sulfuric acid production to acid process, the present technology has the following problems: a. the equipment is severely corroded. b. The wet conversion acid production part only adopts one-to-one absorption, the sulfur utilization rate is low, a tail gas absorption device is required, otherwise the environmental protection requirement cannot be met, the concentration of the prepared acid product is limited, and the general acid concentration cannot exceed 97 percent.
CN1339400A, the acid gas containing hydrogen sulfide is combined with sulfur to prepare high-concentration sulfuric acid, the sulfur and hydrogen sulfide are used together to prepare high-concentration sulfuric acid in the process, the investment is high, and the process is complex.
The invention content is as follows: the invention aims to provide a method for treating acid gas containing hydrogen sulfide generated in the industries of synthetic ammonia industry, petrochemical industry, coking chemical industry and the like to produce high-concentration sulfuric acid and eliminate environmental pollution.
The invention is realized by the following steps:
1. the acid gas containing hydrogen sulfide is processed by the procedures of combustion, temperature reduction, acid mist removal and drying. When the blower is used for exhausting air, the hydrogen sulfide combustion furnace is operated at negative pressure, the acid gas containing hydrogen sulfide is fed into the combustion furnace and combusted together with air in the combustion furnace, the combustion temperature is controlled at 500-1300 ℃, and the acid gas is passed through a heat exchange deviceCooling to 150-600 deg.C, humidifying, cooling, demisting, etc., removing 20-100% of acid mist, introducing the flue gas containing water vapor into a washing tower, further cooling and demisting, introducing into an electric demister at 10-60 deg.C, introducing the demisted gas and air (or oxygen-enriched gas) into a drying circulation system to make the water content in the gas discharged from the drying tower less than 1g/Nm3. Part of 1-70% dilute sulfuric acid generated in the humidifying, cooling and demisting processes is removed to an absorption system, and the rest is used as a by-product or a water removal treatment neutralization device.
2. Conversion and absorption procedure
Gas from drying cycle systemThe process gas is preheated to a certain temperature by the heat exchange equipment and then enters a converter of a conversion system, most of sulfur dioxide in the process gas is converted into sulfur trioxide through first conversion, the sulfur trioxide in the process gas is absorbed by sulfuric acid, then the process gas is preheated to acertain temperature by the heat exchange equipment and enters the converter for secondary conversion, and the sulfuric acid is used again to absorb the sulfur trioxide in the process gas. The sulfur trioxide in the process gas is absorbed to generate a sulfuric acid product with high concentration and good quality. SO in the finally discharged tail gas2The content is low, and reaches the national GB16297-1996 emission standard.
The invention has the following characteristics when treating the acid gas containing hydrogen sulfide: a. the acid making part can adopt a two-conversion two-absorption process, the sulfur utilization rate is high, the environment-friendly requirement can be met without adopting a tail gas absorption device, and the concentration of the prepared acid product is 78-110%. b. The operation cost is low. c. The investment of the device is small. d. The operation is simple. e. The corrosion of the equipment is not serious.
The flow is illustrated as follows:
when the acid gas containing hydrogen sulfide produced in the synthetic ammonia industry, the petrochemical industry, the coking chemical industry and other industries is exhausted by a main blower, the hydrogen sulfide in a hydrogen sulfide combustion furnace is operated under negative pressure, the hydrogen sulfide enters the combustion furnace and is combusted together with air in the combustion furnace, the combustion temperature is controlled to be 500-1300 ℃, the temperature is reduced to 150-500 ℃ by a heat exchange device, the hydrogen sulfide enters a heat insulation, humidification and cooling device to remove 30-100% of acid mist, the process gas containing saturated steam enters a washing tower, the temperature is further reduced and demisted, the process gas enters an electric demister at 10-60 ℃, and the demisted gas enters a drying and circulating system.
The main reaction is as follows:
The process gas from the heat exchange equipment enters the conversion system at 350-500 DEG CAfter the first conversion, 60-97% of sulfur dioxide in the process gas is converted into sulfur trioxide, the sulfur trioxide in the process gas is absorbed by sulfuric acid, the process gas is preheated to 350-500 ℃ by heat exchange equipment and then enters the conversion system again for secondary conversion, and then the sulfur trioxide in the process gas is absorbed by sulfuric acid. The sulfur trioxide in the process gas is absorbed to generate a sulfuric acid product with the concentration as high as 78-110%. SO in the finally discharged tail gas2The content is low, and reaches GB16297-1996 emission standard.
The main reaction is as follows:
The invention not only puts an end to the environmental pollution caused by hydrogen sulfide, but also makes full use of hydrogen sulfide resources, and has the advantages of full heat recovery, small equipment corrosivity, continuous and stable process and good safety. The obtained sulfuric acid product has good quality, high concentration and wide application. The method for treating the hydrogen sulfide is a green and environment-friendly process.
The specific implementation mode is as follows:
example (b): the acid gas containing hydrogen sulfide generated in the coal coking process comprises the following gas components: h2S 32％；CO265％；N23% and gas content 6300 Nm3H is used as the reference value. When the main blower is used for exhausting air, the hydrogen sulfide combustion furnace is operated at negative pressure, and acid gas containing hydrogen sulfide enters the combustion furnace and is mixed with airThe gas is combusted in a combustion furnace, is cooled by heat exchange equipment, enters humidifying and cooling equipment, 50% of acid mist is removed, the flue gas containing saturated steam enters a washing tower for further cooling and demisting, enters an electric demister at 25-60 ℃, and the demisted gas and a certain amount of air enter a drying and circulating system.
Preheating process gas from a drying circulating system by using heat exchange equipment, then feeding the preheated process gas into a conversion system, and converting 80-97% of sulfur dioxide in the process gas by first conversionAnd (3) generating sulfur trioxide, absorbing the sulfur trioxide in the sulfur trioxide by using 93-110% sulfuric acid, preheating the process gas to a temperature higher than the ignition temperature of the catalyst, entering a conversion system again for secondary conversion, and absorbing the sulfur trioxide of the process gas by using 93-110% sulfuric acid. Sulfur trioxide in the process gas is absorbed to generate 93-110% sulfuric acid products, and the yield is 8.5-9 t/h. SO in the finally discharged tail gas2The content is low, and reaches GB16297-1996 emission standard.
Claims (4)
1. The method for preparing high-concentration sulfuric acid by utilizing acid gas containing hydrogen sulfide is characterized by mainly comprising the following process flow steps:
① burning hydrogen sulfide in the burning furnace, controlling the burning temperature at 500-1300 ℃, and discharging the furnace gas at the second outlet
3-15% of sulfur oxide and 0-15% of oxygen, transferring heat to the gas after hydrogen sulfide combustion,
After humidification, cooling and demisting, the mixture enters a drying cycle together with a certain amount of air or oxygen-enriched gas
Removing water in the system;
② the gas after moisture removal enters a conversion system after heat exchange of heat exchange equipment, and the second gas in the process gas
Converting 70-97% of sulfur oxide into sulfur trioxide, and absorbing with sulfuric acid in a first absorption circulating system
After sulfur trioxide in the gas is collected, the gas is sent to a conversion system after heat exchange of heat exchange equipment
Carrying out secondary conversion, converting 80-100% of sulfur dioxide into sulfur trioxide, and then carrying out a second absorption cycle
Absorbing sulfur trioxide in the gas by using sulfuric acid in a ring system, and then discharging the gas after reaching the standard;
③ the sulfur trioxide is absorbed to generate sulfuric acid with high quality, high concentration and wide application.
2. The process for producing high-concentration sulfuric acid from an acid gas containing hydrogen sulfide as claimed in claim 1, wherein ① is a process for burning the acid gas containing hydrogen sulfide with air in a hydrogen sulfide burner to produce a high-temperature flue gas containing sulfur dioxide at a temperature of 500 ℃ to 1300 ℃, the high-temperature flue gas is heated and cooled by a heat exchange device to a gas temperature of 150 ℃ to 600 ℃, the gas is humidified, heated and acid mist removed, and then the gas is introduced into a drying cycle together with air or oxygen-enriched gas, and is dried with 78% to 100% sulfuric acid.
3. The process for preparing high-concentration sulfuric acid from the acidic gas containing hydrogen sulfide as claimed in claim 1, wherein the sulfur dioxide-containing gas dried in the drying cycle system in the process step ② is heated by the heat exchange equipment and then enters the conversion system, 80-97% of the sulfur dioxide in the process gas is converted into sulfur trioxide, the sulfur trioxide in the gas is absorbed by the sulfuric acid in the first absorption cycle system, the gas is subjected to heat exchange by the heat exchange equipment and then enters the conversion system for secondary conversion, 80-100% of the sulfur dioxide is converted into sulfur trioxide, the sulfur trioxide in the gas is absorbed by the sulfuric acid in the second absorption cycle system, and then the gas reaches the standard and is discharged.
4. The process for producing high-concentration sulfuric acid from an acid gas containing hydrogen sulfide as claimed in claim 1, wherein the concentrated sulfuric acid in process step ③ absorbs sulfur trioxide in the converted process gas to produce high-concentration sulfuric acid with a concentration of 78% to 110%, and the process water required for producing sulfuric acid is supplemented with water in flue gas after combustion of hydrogen sulfide in process step ①.
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| CN 02137839 CN1251965C (en) | 2002-06-25 | 2002-06-25 | Preparation of high-concntration surlfuric acid using hydrogen sulfide contained acidic gas |
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| CN 02137839 CN1251965C (en) | 2002-06-25 | 2002-06-25 | Preparation of high-concntration surlfuric acid using hydrogen sulfide contained acidic gas |
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Cited By (6)
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| CN101979130A (en) * | 2010-10-25 | 2011-02-23 | 四川大学 | Method for removing hydrogen sulfide from industrial gas in recycling way |
| CN102371108A (en) * | 2010-08-20 | 2012-03-14 | 中国石油化工集团公司 | Method for producing sulfuric acid by oxygen-enriched air incineration of acid gas containing hydrogen sulfide |
| CN102502526A (en) * | 2011-10-10 | 2012-06-20 | 瓮福（集团）有限责任公司 | Method for treating hydrogen sulfide-containing tail gas from large-scale coal chemical plant |
| CN105080309A (en) * | 2014-05-23 | 2015-11-25 | 国网山西省电力公司电力科学研究院 | Purifying treatment method for sulfur hexafluoride detection tail gas, and apparatus thereof |
| CN107469588A (en) * | 2016-06-07 | 2017-12-15 | 上海宝钢化工有限公司 | SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration |
| CN109369465A (en) * | 2018-12-10 | 2019-02-22 | 黔西县黔希煤化工投资有限责任公司 | Use H2The method of S gas deep processing production antineoplastic fluorouracil medicine intermediate |
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| US9370745B2 (en) | 2013-04-24 | 2016-06-21 | Jiangsu New Century Jiangnan Environmental Protection Co., Ltd | Flue gas-treating method and apparatus for treating acidic tail gas by using ammonia process |
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2002
- 2002-06-25 CN CN 02137839 patent/CN1251965C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371108A (en) * | 2010-08-20 | 2012-03-14 | 中国石油化工集团公司 | Method for producing sulfuric acid by oxygen-enriched air incineration of acid gas containing hydrogen sulfide |
| CN101979130A (en) * | 2010-10-25 | 2011-02-23 | 四川大学 | Method for removing hydrogen sulfide from industrial gas in recycling way |
| CN101979130B (en) * | 2010-10-25 | 2013-03-20 | 四川大学 | Method for removing hydrogen sulfide from industrial gas in recycling way |
| CN102502526A (en) * | 2011-10-10 | 2012-06-20 | 瓮福（集团）有限责任公司 | Method for treating hydrogen sulfide-containing tail gas from large-scale coal chemical plant |
| CN105080309A (en) * | 2014-05-23 | 2015-11-25 | 国网山西省电力公司电力科学研究院 | Purifying treatment method for sulfur hexafluoride detection tail gas, and apparatus thereof |
| CN105080309B (en) * | 2014-05-23 | 2018-01-05 | 国网山西省电力公司电力科学研究院 | A kind of purifying treatment method and device for sulfur hexafluoride detection tail gas |
| CN107469588A (en) * | 2016-06-07 | 2017-12-15 | 上海宝钢化工有限公司 | SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration |
| CN109369465A (en) * | 2018-12-10 | 2019-02-22 | 黔西县黔希煤化工投资有限责任公司 | Use H2The method of S gas deep processing production antineoplastic fluorouracil medicine intermediate |
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| CN1251965C (en) | 2006-04-19 |
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