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

A combined method and technology of degassing, applied in hydrogen separation, climate sustainability, combustible gas purification, etc., can solve the problems of increased sulfur emissions, increased investment, inconvenience, etc.

Inactive Publication Date: 2011-09-14
何巨堂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] The composition of No. 1 raw coal gas (hydrogen sulfide volume concentration 0.1290%) is as shown in Table 1. The hydrogen sulfide removal process adopts the "PDS + tannin extract" method, which is operated under the condition of slightly positive pressure and about 40 ° C. The hydrogen sulfide removal process adopts double towers ( The first dehydrogen sulfide tower and the second dehydrogen sulfide tower) are connected in series, and the hydrogen sulfide volume concentration of purified raw coal gas is controlled to about 300PPm. It is mixed with the top gas of the second hydrogen desulfurization tower through the bypass pipeline to be purified gas for coal exchange. The poor solvent and sulfur foam are obtained in the rich solvent regeneration part, and the sulfur foam is sent to the sulfur melting tank to produce sulfur for sale.

[0189] Since No. 1 raw coal gas contains tar and other impurities, in order to prolong the life of the conversion catalyst and improve t...

Embodiment 2

[0224] Based on Example 1, the first desorbing gas dehydrogen sulfide process adopts the second process: there is a first lean solution and a second lean solution, and the first lean solution is connected in series, that is, the first lean solution is all passed through the second gas-liquid transfer process. The latter part of the mass stage becomes the first semi-lean liquid and then all enter the first gas-liquid mass transfer stage; the second lean solution is connected in series, that is, the second lean solution passes through the second gas-liquid mass transfer stage and becomes the second semi-lean liquid Then it enters the second gas-liquid mass transfer section and becomes the second rich solution in the front section, so as to maximize the hydrogen sulfide loading capacity of the second poor solution and minimize the total solvent circulation. The ratio of the second lean solution flow rate to the first lean solution flow rate is 0.25:1, and the hydrogen sulfide volu...

Embodiment 3

[0226] Based on Example 1, the first desorption gas dehydrogen sulfide process adopts the third process: there is a first lean solution and a second lean solution, and the first lean solution is connected in series, that is, the first lean solution is all passed through the second gas-liquid transfer process. The latter part of the mass section becomes the first semi-lean solution and then all enter the first gas-liquid mass transfer section; the second lean solution only passes through the front end of the second gas-liquid mass transfer section to become the second rich solution, forming the first desorbed gas high sulfur The absorption section dedicated to hydrogen concentration controls the liquid / gas volume ratio in the rear section of the second gas-liquid mass transfer section within a reasonable range to prevent the liquid / gas volume ratio from being too large; since the first gas-liquid mass transfer section and the second gas-liquid mass transfer section The number of...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/56C01B17/04C10K1/32C10K1/08C10K1/00
CPCY02P20/10
Inventor 何巨堂
Owner 何巨堂
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