Zero-emission sulfur recovery technology combined with low-temperature methanol washing acid gas treatment

A low-temperature methanol washing and acid gas technology, which is applied to the separation of dispersed particles, chemical instruments and methods, and separation methods, can solve the problems of complex process flow, high operating costs and energy consumption, and large construction investment, and achieve obvious environmental benefits , process shortening, operating cost and energy consumption reduction effects

Inactive Publication Date: 2012-08-15
SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of process is complex, with many equipments, large construction investment, high operating costs and energy consumption.

Method used

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  • Zero-emission sulfur recovery technology combined with low-temperature methanol washing acid gas treatment
  • Zero-emission sulfur recovery technology combined with low-temperature methanol washing acid gas treatment
  • Zero-emission sulfur recovery technology combined with low-temperature methanol washing acid gas treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A zero-emission sulfur recovery process combined with low-temperature methanol washing acid gas treatment, which sets the low-temperature methanol washing acid gas treatment process and Claus sulfur recovery process into a closed loop, including steps:

[0042] 1) The acid gas discharged from the low-temperature methanol washing is produced and recovered through the Claus sulfur recovery unit;

[0043] 2) Hydrogenation and reduction treatment of tail gas from sulfur production, to remove all non-H in the tail gas 2 S sulfide is converted to H 2 S;

[0044] 3) passing the tail gas obtained in step 2) into the cooling water to cool down to 5° C., and discharging the condensed process wastewater;

[0045] 4) The cooled tail gas is compressed to 0.2MPa.g by the gas compressor, enters the low-temperature methanol washing unit, and enters the lower part of the dehydrogenation tower at the same time as the methanol flash gas at the bottom of the dehydrogenation tower;

[00...

Embodiment 2

[0050] A zero-emission sulfur recovery process combined with low-temperature methanol washing acid gas treatment, which sets the low-temperature methanol washing acid gas treatment process and Claus sulfur recovery process into a closed loop, including steps:

[0051] 1) The acid gas discharged from the low-temperature methanol washing is produced and recovered through the Claus sulfur recovery unit;

[0052] 2) Hydrogenation and reduction treatment of tail gas from sulfur production, to remove all non-H in the tail gas 2 S sulfide is converted to H 2 S;

[0053]3) passing the tail gas obtained in step 2) into cooling water to cool down to 25° C., discharging the condensed process wastewater, and dehydrating the cooled tail gas;

[0054] 4) The tail gas after dehydration is compressed to 0.3MPa.g by the gas compressor, enters the low-temperature methanol washing unit, and enters the lower part of the dehydrogenation tower at the same time as the methanol flash gas at the bot...

Embodiment 3

[0059] A zero-emission sulfur recovery process combined with low-temperature methanol washing acid gas treatment, which sets the low-temperature methanol washing acid gas treatment process and Claus sulfur recovery process into a closed loop, including steps:

[0060] 1) The acid gas discharged from the low-temperature methanol washing is produced and recovered through the Claus sulfur recovery unit;

[0061] 2) Hydrogenation and reduction treatment of tail gas from sulfur production, to remove all non-H in the tail gas 2 S sulfide is converted to H 2 S;

[0062] 3) passing the tail gas obtained in step 2) into the cooling water to cool down to 40° C., and discharging the condensed process wastewater;

[0063] 4) The cooled tail gas is compressed to 0.25MPa.g by the gas compressor, enters the low-temperature methanol washing unit, and enters the lower part of the dehydrogenation tower at the same time as the methanol flash gas at the bottom of the dehydrogenation tower;

[...

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Abstract

The invention belongs to the technical field of sulfur recovery and particularly relates to a zero-emission sulfur recovery technology combined with low-temperature methanol washing acid gas treatment. In the zero-emission sulfur recovery technology, a low-temperature methanol washing acid gas treatment unit and a Claus sulfur recovery unit are set to a closed loop. The zero-emission sulfur recovery technology comprises the following steps: firstly, acid gas emitted from low-temperature methanol washing is subjected to sulfur production and recovery by the Claus sulfur recovery unit; sulfur production tail gas enters a low-temperature methanol washing unit after being subjected to hydrogenation reduction, cooling and compression; H2S in the tail gas is absorbed by low-temperature methanol and waste gas is exhausted from the top of a tower; methanol at the bottom of a hydrogen sulfide removal tower enters a methanol thermal regeneration tower; concentrated H2S acid gas is obtained at the top of the tower; and the concentrated H2S acid gas together with the H2S-containing acid gas produced in low-temperature methanol washing enters the Claus sulfur recovery unit for sulfur production. The zero-emission sulfur recovery technology is free of limitation by balance absorption of amine-method tail gas treatment, can obtain theoretic 100% sulfur recovery rate and has remarkable economical and environmental benefits; and the process is shortened greatly and the construction investment, operating cost and energy consumption are reduced by over 30%.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and in particular relates to a zero-emission sulfur recovery process combined with low-temperature methanol washing acid gas treatment. Background technique [0002] The raw material of the Claus sulfur recovery unit mainly comes from the H-containing 2 S acid gas. The main reaction of the conventional Claus process includes the thermal reaction stage in the combustion furnace, and the catalytic reaction stage in the catalyst bed. Since the Claus reaction is limited by factors such as thermodynamic equilibrium and kinetic equilibrium, the conventional gram The sulfur recovery rate of the Rolls unit can only reach 95-97% usually, and the SO 2 The emission is large, the concentration is high, and the pollution to the environment is great. Hydrogenation and reduction of various forms of sulfur and sulfides in conventional Claus tail gas to H 2 S is then absorbed and discharged after inci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/48B01D53/75
Inventor 范西四
Owner SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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