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Low-sulfur discharging and sulfur recycling process of intermediate concentration acid gas

A sulfur recovery and acid gas technology, applied in chemical recovery, sulfur preparation/purification, energy input, etc., to achieve good safe operation conditions, simple scrapping procedures, and good scrapping treatment conditions

Active Publication Date: 2016-02-10
山东迅达化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in practice, limited by the catalyst reaction performance and process control level, although the exhaust gas of this process can reach GB16297-1996 for SO 2 Concentration upper limit requirements, GB14554-93 for H 2 S concentration upper limit and emission requirements, but may not be able to meet the current stricter emission standards of the industry or region, such as achieving the total sulfur conversion of the exhaust tail gas to SO 2 ≤10mg / m 3 The main reason is that the structural design of direct oxidation reactor, selective oxidation reactor and catalytic oxidation adsorption desulfurization tower, the performance of catalyst and desulfurizer, and the control of process conditions need to be improved.

Method used

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  • Low-sulfur discharging and sulfur recycling process of intermediate concentration acid gas

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Embodiment 1

[0040] A set of 10,000 tons / year sulfur recovery unit, including a direct oxidation reactor, a selective oxidation reactor and two adsorption desulfurization towers that can be connected in series and parallel; the direct oxidation reactor is filled with TiO 2 Sulfur recovery catalyst 60m 3 , the catalyst is loaded in 6 layers, with air inlets and cooling coils between the layers; the selective oxidation reactor is filled with Fe 2 o 3 / SiO 2 selective oxidation of H 2 S Catalyst 60m 3 , the catalyst is packed in 6 layers, with air inlets and cooling coils between the layers; the two adsorption desulfurization towers are filled with Na 2 CO 3 / Activated carbon catalytic oxidation adsorption desulfurizer 200m 3 ; The basic operating conditions of the device are:

[0041] 1) Acid gas 20000m 3 / hr,H 2 S volume content 5.0%, the rest is mainly CO 2 , COS≤20mg / m 3 , SO 2 ≤100mg / m 3 , without CS 2 , in the direct oxidation reactor and the air 2200m 3 Reaction around ...

Embodiment 2

[0052] A set of 10,000 tons / year sulfur recovery unit, including a direct oxidation reactor, a selective oxidation reactor and two adsorption desulfurization towers that can be connected in series and parallel; the direct oxidation reactor is filled with TiO 2 Sulfur Recovery Catalyst 40m 3 , the catalyst is loaded in 6 layers, with air inlets and cooling coils between the layers; the selective oxidation reactor is filled with Fe 2 o 3 / SiO 2 selective oxidation of H 2 S Catalyst 40m 3 , the catalyst is packed in 6 layers, with air inlets and cooling coils between the layers; the two adsorption desulfurization towers are filled with Fe 2 o 3 / Activated carbon catalytic oxidation adsorption desulfurizer 125m 3 ; The basic operating conditions of the device are:

[0053] 1) Acid gas 5000m 3 / hr,H 2 S volume content 20%, the rest is mainly CO 2 , SO 2 ≤100mg / m 3 , excluding COS, CS 2 , mercaptan, sulfide and other organic sulfur, in the direct oxidation reactor and ...

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Abstract

The invention provides a low-sulfur discharging and sulfur recycling process of intermediate concentration acid gas. A purpose of desulphurizing low-concentration acid gas with H2S content of 5 to 20 percent can be achieved by treating the low-sulfur acid gas by virtue of a direct oxidation reactor, a selective oxidation reactor and two adsorption desulphurization towers which can be connected in series and parallel; the direct oxidation reactor is filled with a TiO2 sulfur recycling catalyst, the selective oxidation reactor is filled with a H2S selective oxidation catalyst, catalysts in the direct oxidation reactor and selective oxidation reactor are packed in multiple layers, an air inlet and a cooling coil pipe are respectively arranged between two layers, and the adsorption desulphurization tower is filled with a thermally-renewable catalytic oxidation adsorption desulphurization agent; by selecting the appropriate catalyst and desulphurization agent and precisely controlling the process condition of each step, the total sulfur contained in the process discharged gas is that SO2 content is less than or equal to 10mg / m<3>. By virtue of thermal regeneration, the service life of the catalytic oxidation adsorption desulphurization agent is greatly prolonged, and the desulphurization amount of the catalytic oxidation adsorption desulphurization agent is greatly increased. The process has the advantages of low sulfur emission, high sulfur recycling rate (approximate to 100 percent), long service life and large desulphurization amount of the desulphurization agent, fewer replacement times, less expense, good desulphurization agent removal and scrapping condition, safety and the like.

Description

technical field [0001] The invention relates to a sulfur recovery process, in particular to a low-sulfur discharge sulfur recovery process for intermediate-concentration acid gas. Background technique [0002] During petrochemical, coal chemical, and coal gasification processes, part of the sulfur contained in raw materials is usually converted into H 2 S, separated to form H 2 The acid gas of S, the acid gas is generally processed through the sulfur recovery process, and the H 2 S is converted to elemental sulfur as much as possible. [0003] In the operation process of the sulfur recovery process unit, there are also two problems of emptying tail gas and solid waste. The tail gas evacuated through the chimney, of which, SO 2 Concentration is a continuous monitoring item, although the upper limit of the current air pollutant comprehensive emission standard GB16297-1996 is 700mg / m 3 It is not difficult to achieve, but there may be more stringent emission standards in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/04
CPCY02P20/129Y02P20/584
Inventor 胡文宾崔国栋王强
Owner 山东迅达化工集团有限公司
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