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Sulfur recovery process for reducing SO2 emission

A sulfur dioxide and sulfur recovery technology, which is applied in the preparation/purification of sulfur, inorganic chemistry, sulfur compounds, etc., can solve problems such as failure to meet emission standards and increase emission concentration, and achieve significant environmental benefits, emission concentration reduction, and low cost. Effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP
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  • Description
  • Claims
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Problems solved by technology

The existing liquid sulfur degassing waste gas treatment adopts incinerator incineration technology, and the waste gas contains H 2 Sulfur-containing substances such as S and sulfur steam are directly introduced into the incinerator for treatment, and the sulfur-containing substances are burned and converted into SO 2 , so that the flue gas SO 2 Emission concentration increased by 150-200mg / m 3 , unable to meet the upcoming emission standards

Method used

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  • Sulfur recovery process for reducing SO2 emission
  • Sulfur recovery process for reducing SO2 emission
  • Sulfur recovery process for reducing SO2 emission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] process such as figure 1 shown. The process includes thermal reaction section, catalytic reaction section and tail gas purification treatment section.

[0046] The thermal reaction section contains H 2 About 92 (v / v)% of S acid gas 1 is partially combusted into SO in reactor 2 2 , at a high temperature of 1250 °C for H 2 S and SO 2 A Claus reaction occurs to form elemental sulfur and process gas. The volume content of sulfur compounds in the process gas is: H 2 S: 5.8%, SO 2 : 2.6%, organic sulfur: 0.5%.

[0047] The process gas enters the primary converter 3 of the catalytic reaction section (reaction conditions: temperature 310°C, space velocity 800h -1 ) and secondary converter 4 (reaction conditions: temperature 245°C, space velocity 800h -1 ), after Claus catalytic conversion, the reacted Claus tail gas 5 enters the tail gas purification unit. The volume content of sulfur compounds in Claus tail gas is: H 2 S: 2.9%, SO 2 : 1.3%, organic sulfur: 0.1%.

...

Embodiment 2

[0050] process such as figure 1 shown. The process includes thermal reaction section, catalytic reaction section and tail gas purification treatment section.

[0051] The thermal reaction section contains H 2 About 82 (v / v)% of S acid gas 1 is partially combusted into SO in reactor 2 2 , at a high temperature of 1250 °C for H 2 S and SO 2 A Claus reaction occurs to form elemental sulfur and process gas. The volume content of sulfur compounds in the process gas is: H2 S: 5.6%, SO 2 : 2.4%, organic sulfur: 0.4%.

[0052] The process gas enters the primary converter 3 in the catalytic reaction section (reaction conditions: temperature 300°C, space velocity 800h -1 ) and secondary converter 4 (reaction conditions: temperature 250°C, space velocity 800h -1 ), after Claus catalytic conversion, the reacted Claus tail gas 5 enters the tail gas purification unit. The volume content of sulfur compounds in Claus tail gas is: H 2 S: 2.7%, SO 2 : 1.3%, organic sulfur: 0.09%.

...

Embodiment 3

[0055] process such as figure 1 shown. The process includes thermal reaction section, catalytic reaction section and tail gas purification treatment section.

[0056] The thermal reaction section contains H 2 About 82 (v / v)% of S acid gas 1 is partially combusted into SO in reactor 2 2 , at a high temperature of 1250 °C for H 2 S and SO 2 A Claus reaction occurs to form elemental sulfur and process gas. The volume content of sulfur compounds in the process gas is: H 2 S: 5.6%, SO 2 : 2.4%, organic sulfur: 0.4%.

[0057] The process gas enters the primary converter 3 in the catalytic reaction section (reaction conditions: temperature 300°C, space velocity 800h -1 ) and secondary converter 4 (reaction conditions: temperature 250°C, space velocity 800h -1 ), after Claus catalytic conversion, the reacted Claus tail gas 5 enters the tail gas purification unit. The volume content of sulfur compounds in Claus tail gas is: H 2 S: 2.7%, SO 2 : 1.3%, organic sulfur: 0.09%. ...

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Abstract

The invention belongs to the technical field of sulfur recovery, and particularly relates to a sulfur recovery process for reducing SO2 emission. According to the sulfur recovery process, a thermal reaction unit, a catalytic reaction unit and a tail gas purification unit are utilized; based on the traditional Claus and SCOT tail gas treatment process, an ammonia water absorption tank is additionally arranged for removing H2S from purified tail gas, so as to ensure that the H2S content in the purified tail gas is lower than 5 mg / m<3>; waste ammonia water is sent to a sewage stripping unit for treating; through the adoption of the sewage stripping device, H2S and ammonia can be respectively extracted; the extracted H2S is returned to a sulfur recovery device for sulfur recovery, and the extracted ammonia is returned to the ammonia water absorption tank for cyclic utilization; finally, the flue-gas SO2 emission concentration for the sulfur recovery device can be reduced below 100 mg / m<3>, the new environmental protection standard to be executed is satisfied, and a novel method for building a new sulfur recovery device with a small investment and low operating cost is provided. The sulfur recovery process is excellent in absorption effect, simple to operate, low in expense, environment-friendly, and economical.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and in particular relates to a sulfur recovery process for reducing sulfur dioxide discharge. Background technique [0002] With the development of society, the problem of environmental pollution has become a restrictive factor for the rapid economic development, and it is an important and indispensable content of the legislation of governments in various countries. Industrially developed countries have very strict requirements on sulfur emissions. The United States Federal Government Environmental Protection Agency regulations stipulate that industrial heating furnace flue gas, sulfur tail gas and catalytic cracking regeneration flue gas SO 2 The emission concentration limit is 50ppm (v), equivalent to about 143mg / m 3 . [0003] At present, the flue gas SO 2 The emission concentration implements GB16297-1996 "Comprehensive Emission Standard of Air Pollutants", and the standard stipula...

Claims

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Application Information

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IPC IPC(8): C01B17/04B01D53/75B01D53/78B01D53/86B01D53/48B01D53/52
CPCB01D53/48B01D53/50B01D53/523B01D53/75B01D53/78B01D53/8603B01D53/8615B01D2252/102B01D2252/204C01B17/0404
Inventor 刘爱华刘剑利梁颖杰陶卫东刘增让许金山
Owner CHINA PETROLEUM & CHEM CORP
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