Combined method for sulfur production, hydrogen production and low-sulfur desorbed gas production by coal gas

Abstract

A combined method for sulfur production, hydrogen production and low-sulfur desorbed gas production by coal gas. Raw coal gas and a semi-lean solvent are separated into cleaned coal gas and a rich solvent after completing counterflow contact for absorbing hydrogen sulfide in a first gas-liquid mass-transfer segment, and the hydrogen sulfide absorbed by the rich solvent is transformed into elemental sulfur in a solvent regeneration part; the cleaned coal gas serially passes through a carbon monoxide transformation hydrogen production process, a first pressure swing absorption part and a second pressure swing absorption part to obtain a first desorbed gas rich in hydrogen sulfide, a highly-pure hydrogen gas, and a second desorbed gas low in hydrogen sulfide; the first desorbed gas and a lean solvent from the solvent regeneration part are separated into a first desorbed gas cleaned gas and a recyclable semi-lean solvent after completing counterflow contact for absorbing hydrogen sulfide in a second gas-liquid mass-transfer segment. The invention belongs to a process integration method, has the advantages of simple process flow, high total sulfur removal rate, high-efficient operation of each step and the like, and is especially suitable for the process of producing crude gas by semi-coke units.

Description

technical field [0001] The invention relates to a combined method of producing sulfur from coal gas, producing hydrogen, and producing low-sulfur deabsorbing gas. The raw coal gas "PDS + tannin extract" wet crude dehydrogen sulfide, raw coal gas carbon monoxide change, and transformation reaction effluent are transformed in two steps. The multiple processes of adsorption separation and first desorption gas wet hydrogen sulfide removal can be integrated to achieve the comprehensive effect of efficient hydrogen production, deep total sulfur removal of fuel gas and efficient hydrogen sulfide removal of gas. Background technique [0002] As we all know, the process of producing coke by coalification produces coal gas, and the coal gas can be raw coal gas containing a large amount of nitrogen produced by the process of producing semi-coke (semi-coke) by internal heat type (direct heating mode) operation, and the coal gas can also be Coal carbonization gas is produced during the p...

AI Technical Summary

Problems solved by technology

[0024] ① Hydrogen sulfide removal is not taken as an independent operation target. Although the conventional pressure swing adsorption hydrogen extraction process of feed gas F has completed the adsorption and desorption process of hydrogen sulfide, there is no utilization plan; the desorption gas is used as fuel gas or combined with Co-combustion of high-calorific-value fuel gas leads to increased sulfur emissions. Due to the large amount of desorbed gas, if a large desorbed gas dehydrogen sulfide device is installed, the investment will be greatly increased;

[0025] ② The hydrogen sulfide component is not separated from other non-hydrogen components. Although the obtained hydrogen sulfide desorbed gas contains rich carbon dioxide, it is not convenient to be used as a gas source for the carbon dioxide method for the decomposition of sodium phenate to produce crude phenol;

[0026] ③ The final conversion method of hydrogen sulfide in desorbed gas is not indicated

[0028] Method of the present invention has no report

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