Claus tail gas treatment system and treatment method

A Claus tail gas and treatment system technology is applied in the field of the tail gas treatment system of a Claus sulfur recovery device, which can solve the problems of high operating cost, complex process flow, and high investment, and achieves alleviating environmental pressure, broad application prospects, and lightening Effects of Environmental Pollution

Active Publication Date: 2015-10-21
美景(北京)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is more complicated, and the operation and operation costs are very high.
[0023] All in all, among the three types of treatment methods, although the selective oxidation process and the low-temperature Claus process have the advantages of simple process flow, less investment, and low operating costs, the sulfur recovery rate is low, which can only reach 99%, which cannot meet the current requirements. In some national air pollution source emission standards, SO 2 Emission concentration is less than 550mg / m 3 requirements
The reduction and absorption process is complex, with high investment and high operating costs. Although it can meet the requirements of the existing national air pollutant comprehensive emission standards, the desulfurization rate can only reach 99.8%, which cannot meet higher environmental protection standards. For example, even if special The formulation of alcohol amine solvents increases the solvent circulation and regeneration depth, and cannot meet the SO in key areas in the petroleum refining industry pollutant discharge standards 2 3 , SO in the general area in the petrochemical industry pollutant discharge standard 2 3 requirements, and cannot meet the SO in key areas in the petrochemical industry pollutant discharge standards 2 3 standard

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  • Claus tail gas treatment system and treatment method

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Embodiment approach

[0108] The Claus tail gas treatment method of the present invention also includes another embodiment, specifically, comprises the following steps:

[0109] S1: React the Claus tail gas to be treated with reducing gas to transform the sulfur content into H 2 S;

[0110] S2: Rapidly cooling the tail gas of step S1 to 30-90°C;

[0111] S3: The tail gas of the S2 step and the liquid sulfur degassed gas from the Claus unit are subjected to oxidative desulfurization to make the H 2 S is transformed into elemental sulfur.

[0112] In a preferred embodiment, in step S2, the tail gas of step S1 is quenched to 40-80°C. In a more preferred embodiment, the tail gas of step S1 is quenched to 50-70°C.

[0113] In a preferred embodiment, the S1 step also includes reacting the Claus tail gas to be treated with a reducing gas, and then performing a hydrolysis reaction to make the residual COS, CS 2 convert to H 2 S.

[0114] According to the treatment system and / or treatment method of t...

Embodiment

[0117] Follow the steps below to treat Claus tail gas and liquid sulfur degassed gas.

[0118] a. Raw gas includes Claus tail gas and liquid sulfur degassed gas from Claus unit. Claus tail gas comes from the third-stage sulfur condenser of two-stage Claus unit. Its composition and properties are: H 2 S content 1.36% (V), SO 2 Content 0.34%, H 2 content 1.59%, COS content 0.08% (V), CO content 5.05%, CO 2 Content 44.45% (V), N 2 Content 10.72% (V), H 2 O content 36.3%, S X The content is 0.1%, the temperature is 160°C, and the pressure is 114Kpa; the liquid sulfur degassing gas comes from the liquid sulfur tank, and its composition and properties are: H 2 S content 0.844% (V), H 2 O content 3.74% (V), N 2 Content 75.4% (V), O 2 Content 20.0%, S X The content is 0.01%, the temperature is 138°C, and the pressure is 90KPa.

[0119] b. The Claus tail gas first enters the preheater, uses medium-pressure steam to raise the gas temperature to 238°C, and then enters the hydro...

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Abstract

The invention provides a Claus tail gas treatment system. The system comprises a hydrogenation unit, a fast cooling unit, a desulfurization unit, an optional hydrolysis unit and an optional liquid sulfur degassing gas supply unit. The invention further provides a Claus tail gas treatment method. According to the tail gas treatment system and treatment method provided by the invention, the sulfur removal rate can be greater than 99.99%; H2S concentration of exhaust gas emitted into the atmosphere is less than 10 ppm, and is, when converted into the SO2 concentration, less than 50 mg/m3; the removal rate and emission concentration can meet the current highest emission limit standard. Furthermore, the system and method have the advantages of: being environmentally-friendly, stable and reliable, less in investment and low in operating cost.

Description

technical field [0001] The invention relates to the field of sulfur-containing tail gas treatment, in particular to a tail gas treatment system of a Claus sulfur recovery device, and a tail gas treatment method using the treatment system. Background technique [0002] In the production process of petrochemical industry and coal chemical industry, the sulfur in raw materials is finally converted into acid gas containing hydrogen sulfide during the processing process, which must be treated or recovered. At present, the Claus sulfur recovery process is usually used to convert hydrogen sulfide into sulfur. [0003] The Claus sulfur recovery process consists of a thermal reaction section and several catalytic reaction sections, that is, containing H 2 The acid gas of S is incompletely burned with air in the combustion furnace, and the air volume is strictly controlled to make H 2 SO produced after S combustion 2 The amount satisfies H 2 S / SO 2 The molecular ratio is equal to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/04
Inventor 胡惊雷肖从峰马琳琳
Owner 美景(北京)环保科技有限公司
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