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Oxidation, reduction and sulfur recovery multipurpose device

A technology of sulfur recovery and sulfur dioxide, which is applied in the direction of sulfur preparation/purification, etc., can solve the problems of existence, high total investment and operation cost of the device, and increase the difficulty of system control, etc.

Active Publication Date: 2008-10-22
苏州璞赛环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in the traditional Claus sulfur recovery process are: the conversion rate of sulfur is not ideal; there is sulfur dioxide in the tail gas; 2 S / SO 2 =2 The control accuracy is difficult to grasp, which will increase the difficulty of system control
This process cannot be said to be an effective method when the hydrogen source is sufficient, but it sends all the tail gas to the hydrogenation reactor, which has a large load, high investment, and more importantly, it is not nearly reasonable from the process route. , that is, in the process route of sulfur-containing gas→oxygen-limited combustion→Claus reaction→hydrogenation reduction→absorption regeneration→incineration and venting, secondary combustion is carried out, and because there is H in the tail gas produced by Claus reaction 2 S, and SO 2 , it is difficult to absorb both H 2 S absorbs SO 2 , so the SO in the exhaust gas should be 2 Hydrogenation reduction to H 2 S, reabsorbed and desorbed H 2 After S, return to the combustion furnace G1 for another sulfur recovery. Therefore, its hydrogenation reduction is an unnecessary process, which makes the process complicated, and the total investment and operating costs of the device are high.
[0030] To sum up, the existing Claus-type (including super and super-excellent and tail gas treatment) sulfur recovery devices are to increase the process flow and increase the operating cost to obtain a higher sulfur recovery rate and exhaust emission standards.
Moreover, they do not consider the comprehensive performance of the device, and basically only deal with the sulfur-containing feed gas rich in hydrogen sulfide. If the hydrogen sulfide concentration in the feed gas is less than 20% of the unit volume, it is difficult to limit oxygen combustion, resulting in Claus reaction not working

Method used

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  • Oxidation, reduction and sulfur recovery multipurpose device
  • Oxidation, reduction and sulfur recovery multipurpose device
  • Oxidation, reduction and sulfur recovery multipurpose device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The sulfur-containing feed gas of this example is rich in hydrogen sulfide, so there is no need to use the hydrogenation reduction unit (4), and the technological process of reclaiming sulfur is as follows:

[0053] 1. See Figure 2, open the valves F1, F4, F5, close the valves F2 and F3, the sulfur-containing raw material gas is preheated by the preheater E1, and divided into two routes C and D through the valve F1, and the D route is connected with the desulfurization purification unit The sulfur dioxide gas from 3 is mixed and enters the Claus sulfur recovery unit 2 (hereinafter referred to as the sulfur recovery unit) through the preheater E13, and the C route is mixed with the sulfur-containing non-condensable gas returned from the sulfur recovery unit 2 and then enters the incineration and oxidation unit 1 , add excess air or oxygen to the incinerator G. If the concentration of hydrogen sulfide in the gas in the furnace is low, fuel gas can be added to support the c...

Embodiment 2

[0069] In this example, the raw material gas is rich in sulfur dioxide and other sulfide gases, and the content of hydrogen sulfide in it is relatively low, which is not enough to form the Claus reaction ratio relationship in which the molar ratio of hydrogen sulfide and sulfur dioxide is equal to 2. The sulfur dioxide is reduced to an appropriate amount of hydrogen sulfide, and the hydrogen sulfide is matched with the sulfur dioxide in the feed gas to meet the Claus reaction ratio relationship, so as to complete the sulfur recovery. The production process is as follows:

[0070] 1. Referring to Figure 2, close the valve F1, open the valves F2 and FC2, the sulfur dioxide-rich feed gas will all enter the hydrogenation reactor R2 after being preheated by the preheater E1 and heat exchanged by the heat exchanger E11, and at the same time, through the control adjustment The valve FC3 adds hydrogen in a limited amount, and the raw material gas and hydrogen undergo an incomplete hydr...

Embodiment 3

[0082] The feed gas in this example is a gas containing only sulfur dioxide and does not contain hydrogen sulfide. Therefore, the Claus reaction ratio relationship of hydrogen sulfide and sulfur dioxide molar ratio of 2 cannot be formed, and a part of the sulfur dioxide feed gas can be directly hydrogenated and reduced. An appropriate amount of hydrogen sulfide is formed, and the hydrogen sulfide is matched with another part of the sulfur dioxide raw material gas to meet the ratio relationship of Claus reaction, so as to complete the sulfur recovery. The specific production process is as follows:

[0083] 1. See Figure 2, close the valve F3 and the regulating valve FC1, open other valves, the feed gas is preheated by the preheater E1 and divided into two routes A and B, and the route A enters the route D through the valve F1 and directly goes to the heat exchanger E13 ; Route B enters hydrogenation reactor R2 through valve F2 and regulating valve FC2 mixed with hydrogen raw mat...

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Abstract

The invention relates to an oxidation-reduction multi-purpose device for sulfur recovery, which is applicable to desulfurization and purifying of sulfur-bearing gas produced during the production processes of oil refining, chemical engineering, coal chemical industry, thermal power plants, etc. The oxidation-reduction multi-purpose device for sulfur recovery comprises a burning oxidation unit, a desulfurization and purifying unit, a hydrogenation reduction unit and a Claus sulfur recovery unit. The invention gets rid of a demanding oxygen-limited burning section positioned in the front part in traditional Claus reaction, which is improved into peroxide burning, and does not necessary pursue sulfur conversion rate of the Claus reaction excessively, and only needs to control the SO2 conversion rate of sulfide in the peroxide burning and the circulating load of desulfurizer in the desulfurization and purifying reaction and the deficiency-degree regenerated thereby, can achieve or exceed recovery percent and SO2 emission of lower concentration than the Claus sulfur recovery device, with adjustable concentration of emission. The oxidation-reduction multi-purpose device of the invention can produce H2S through the hydrogenation reduction unit, thus having no requirement for the concentration of H2S in the sulfur-bearing gas, flexible operation and good comprehensive processing capacity.

Description

technical field [0001] The invention relates to a device for recovering sulfur from sulfur-containing gas produced in the production process of oil refining, chemical industry, coal chemical industry or thermal power plant. Specifically, it is a multi-purpose device for redox sulfur recovery. Background technique [0002] At present, the well-known sulfur recovery unit abroad is the Claus (CLAUS) reaction sulfur recovery unit. Referring to Fig. 3, it mainly includes a combustion furnace G1, a secondary Claus reactor R4, a tertiary sulfur cooler E17, a liquid sulfur pool V1 and a tail gas incinerator G2. The process is: the sulfur-containing raw material gas (which is rich in hydrogen sulfide) is preheated by the preheater E15 and enters the combustion furnace G1 with oxygen or air and fuel gas for oxygen-limited incomplete combustion. The combustion reaction formula is as follows: [0003] h 2 S+3 / 2O 2 → SO 2 +H 2 o [0004] By controlling the amount of oxygen or air e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/04
Inventor 王胜利褚雅安
Owner 苏州璞赛环境科技有限公司
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