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.
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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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