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Tail gas-recycled sulfur recovery method

A technology of tail gas recycling and sulfur recovery, applied in separation methods, chemical instruments and methods, and sulfur preparation/purification, etc. The effect of reducing emissions and reducing pollution

Active Publication Date: 2008-10-01
江苏晟宜环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the tail gas treated by this method can reach the national discharge standard in terms of concentration, because the total discharge is large, the total amount of harmful substances contained is also large; at the same time, this substance (sulfur) is not utilized and is wasted. resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: A tail gas recycling sulfur recovery method, the tail gas recycling sulfur recovery method includes: washing the external acid gas with low-temperature methanol, mixing and diluting the oxygen-free gas to a concentration of 3%, separating the condensed water, and washing it with acidic gas The gas preheater is heated to 220°C, mixed with the air heated to 220°C by the air preheater after the calculated oxygen content, and enters the catalytic oxidation reactor for reaction. The reacted gas enters the condenser to condense sulfur, and the condensed The gas-liquid mixture is separated from liquid sulfur and gas by a sulfur separator, and the gas is discharged after being washed by a scrubber; the tail gas recycling sulfur recovery method also includes: 1) mixing and diluting external acid gas to reduce The oxygen-free gas with a concentration of 3% is nitrogen, and after normal operation, the oxygen-free gas is the exhaust gas after being washed by the scrubb...

Embodiment 2

[0024] Embodiment 2: A tail gas cycle sulfur recovery method, the tail gas cycle sulfur recovery method comprises: external acid gas, mixed with anaerobic gas, diluted to a concentration of 2%, after separating condensed water, the acid gas preheater Heated to 200°C, mixed with the air heated to 200°C by the air preheater with the calculated oxygen content, and enters the catalytic oxidation reactor for reaction. The reacted gas enters the condenser to condense sulfur, and the condensed gas-liquid mixture passes through The sulfur separator separates liquid sulfur and gas, and the gas is discharged after being washed by the scrubber; the tail gas cycle sulfur recovery method also includes: 1) When the original start-up and when the system is shut down and restarted, the external acid gas is mixed and diluted to a concentration of 2 % of the oxygen-free gas is nitrogen, and after normal driving, the oxygen-free gas is the exhausted gas after being washed by the scrubber after ca...

Embodiment 3

[0032] Embodiment 3: a tail gas cycle sulfur recovery method, the tail gas cycle sulfur recovery method comprises: external acid gas, mixed with anaerobic gas and diluted to a concentration of 5%, after separating condensed water, passing through an acid gas preheater Heated to 210°C, mixed with the air heated to 210°C by the air preheater with the calculated oxygen content, and enters the catalytic oxidation reactor for reaction. The reacted gas enters the condenser to condense sulfur, and the condensed gas-liquid mixture passes through The sulfur separator separates liquid sulfur and gas, and the gas is discharged after being washed by the scrubber; the tail gas recycling sulfur recovery method also includes: 1) When the original start-up and when the system is shut down and restarted, the external acid gas is mixed and diluted to a concentration of 5 % of the oxygen-free gas is nitrogen, and after normal driving, the oxygen-free gas is the exhausted gas after being washed by...

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PUM

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Abstract

The invention relates to a method for tail gas recycling sulphur recovery. The method of the invention comprises the steps that external acidic gas is blended with inert gas to reduce the concentration to 2 to 5 percent; after being treated with condensate separation, the mixed gas is heated to 200 to 220 DEG C and blended with air, the oxygen content of which is calculated and which is heated to 200 to 220 DEG C, to react after entering a catalytic oxidation reactor; the gas after the reaction enters a condenser to condense the sulphur; the condensed gas-liquid mixture is treated with the separation of liquid sulfur and gas by a sulphur separator and the gas is then discharged after being washed in a washing tower. In addition, the method for tail gas recycling sulphur recovery also comprises the steps that: 1) when a car is previously run and re-run after the system shutdown, the anoxic gas which is blended with the external acidic gas and dilutes and reduces the concentration of the external acidic gas to 2 to 5 percent is nitrogen gas, and after the car is normally run, the anoxic gas is the discharged gas which is pre-calculated and washed in the washing tower. Meanwhile, the method for tail gas recycling sulphur recovery can greatly reduce the exhaust emission amount of the treated tail gas and also reduce the content of surphur in the emitted tail gas.

Description

technical field [0001] The invention relates to the field of environmental protection technology, in particular to a tail gas recycling sulfur recovery method for removing hydrogen sulfide in the process of producing various chemical products using coal as raw material in the coal chemical industry, as well as oil refining and petrochemical, coke oven gas acid gas containing hydrogen sulfide. Background technique [0002] Among my country's proven energy reserves, 96% are coal, and oil and gas resources account for about 4% of the total. Therefore, coal is the main force of energy in our country. Therefore, in recent years, the technical means of producing methanol and synthetic ammonia as well as coal oil and olefins using coal as raw material have been increasing to relieve the pressure on oil and gas resources. [0003] The new generation of coal chemical industry is based on carbon-chemistry to synthesize various fuel oils and chemical products. In the process of coal c...

Claims

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Application Information

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IPC IPC(8): C01B17/04B01D53/86B01D53/48B01D53/75C10K1/34
Inventor 邵志辉丁海荣王庆芬王素芬
Owner 江苏晟宜环保科技有限公司
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