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Treatment technology for Claus tail gas containing sulfur dioxide, hydrogen sulfide and organic sulfur

A Claus tail gas, sulfur dioxide technology, applied in the preparation/purification of sulfur, chemical instruments and methods, separation of dispersed particles, etc., can solve the problems of large investment, complex process, high energy consumption, and achieve low investment and simple process. Effect

Active Publication Date: 2014-01-08
陕西延长石油(集团)有限责任公司炼化公司 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to solve technical problems such as large investment, high energy consumption, complex process, and substandard sulfur recovery rate in the prior art, the present invention aims to provide a 2 , CO 2 、H 2 O, CO, H 2 、H 2 S, SO 2 , COS, CS 2 The recovery and treatment process of Claus tail gas with sulfur vapor and entrained liquid sulfur adopts complex iron sulfur recovery process, which has the advantages of low investment, simple process, sulfur recovery rate can reach 99.95%, and the sulfur content in tail gas is lower than 1.0 mg / m 3 and other advantages

Method used

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  • Treatment technology for Claus tail gas containing sulfur dioxide, hydrogen sulfide and organic sulfur

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Heat the Claus tail gas to 210°C through the heat exchanger 1, and then pass it into the hydrogenation reactor 2 according to the ratio of the sulfur content in the tail gas to the hydrogen molar ratio of 1:1.1, and the hydrogenation reactor 2 has Low-temperature hydrogenation catalyst, the gas temperature after hydrogenation reaches above 260°C, the gas is cooled to 50°C through the fourth stage of the cooler 3, and then the gas enters the complex iron liquid phase redox desulfurizer 4, and simultaneously flows to the complex iron liquid Compressed air is fed into the phase redox desulfurizer 4 . The temperature inside the complex iron liquid-phase redox desulfurizer 4 is 15°C, hydrogen sulfide is converted into sulfur, the sulfur settles in the complex iron liquid-phase redox desulfurizer 4 and is filtered through the sulfur filter 5, and the supernatant is centrifuged The pump 6 returns to the complex iron liquid phase redox desulfurizer 4, and the tail ga...

Embodiment 2

[0040] Example 2: Heat the Claus tail gas to 280°C through the heat exchanger 1, and then pass it into the hydrogenation reactor 2 according to the ratio of the sulfur content in the tail gas to the hydrogen molar ratio of 1:1.1, and the temperature after the reaction is 310°C. This gas is cooled to 80°C by four stages of cooler 3, and then the cooled gas is directly passed into the complex iron liquid phase redox desulfurizer 4, and at the same time, it is passed into the complex iron liquid phase redox desulfurizer 4 compressed air. The temperature inside the complex iron liquid-phase redox desulfurizer 4 is 60° C., hydrogen sulfide is converted into sulfur, and the sulfur settles in the complex iron liquid-phase redox desulfurizer 4 and is filtered through the sulfur filter 5 . The supernatant is returned to the complex iron liquid phase redox desulfurizer 4 through the centrifugal pump 6, and the tail gas is directly discharged through the tail gas chimney 8. The hydrogen...

Embodiment 3

[0041] Example 3: Heat the Claus tail gas to 235°C through the heat exchanger 1, and then pass it into the hydrogenation reactor 2 according to the ratio of the sulfur content in the tail gas to the hydrogen molar ratio of 1:1.1, and the temperature after the reaction is 273°C; This gas flow is cooled to 65° C. through the cooler 3, and then directly enters the complex iron liquid-phase redox desulfurizer 4, and at the same time, compressed air is fed into the complex iron liquid-phase redox desulfurizer 4. The temperature inside the complex iron liquid-phase redox desulfurizer 4 is 50° C., hydrogen sulfide is converted into sulfur, and the sulfur settles in the complex iron liquid-phase redox desulfurizer 4 and is filtered through the sulfur filter 5 . The supernatant is returned to the complex iron liquid phase redox desulfurizer 4 through the centrifugal pump 6, and the tail gas is directly discharged through the tail gas chimney 8. The sulfur content of the treated tail ga...

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Abstract

The invention provides a treatment technology for Claus tail gas containing sulfur dioxide, hydrogen sulfide and organic sulfur. The treatment technology comprises the following steps: (1) a heating step; (2) a reduction and transformation step; (3) a cooling step; (4) an oxidation-reduction step; and (5) a recovery step. According to the treatment technology, the hydrogen sulfide in the tail gas is absorbed by means of iron complex liquid phase oxidation-reduction, sulfur recovery rate is more than 99.95%, sulfur content in the tail gas is less than 1.0mg / m<3>, and the treatment technology has the characteristics of low investment, low energy consumption, high sulfur recovery rate and great operation flexibility.

Description

technical field [0001] The invention relates to the technical field of gas treatment, in particular to a Claus tail gas treatment process for sulfur dioxide, hydrogen sulfide and organic sulfur. Background technique [0002] Claus tail gas generally contains N 2 , CO 2 、H 2 O, CO, H 2 、H 2 S, SO 2 , COS, CS 2 and sulfur vapor and entrained liquid sulfur. Due to the limitation of chemical reaction balance and other sulfur losses, the total recovery rate of sulfur in a conventional Claus unit generally does not exceed 97%. Therefore, if the tail gas of the Claus unit is not further treated, the sulfur content is much higher than 960mg / m3 3 , direct discharge is not allowed. At present, the existing tail gas treatment processes at home and abroad can be divided into 4 categories: ①Claus process method, by controlling the reaction temperature conditions, the Claus reaction is carried out at a temperature lower than the sulfur dew point or the reaction is carried out i...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/76B01D53/86B01D53/78B01D53/50B01D53/52B01D53/48C01B17/05
Inventor 郭志勇张伍刘宏伟杨仲煦王军峰徐西娥郑拴辰董林堂
Owner 陕西延长石油(集团)有限责任公司炼化公司
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