Removal of hydrogen sulfide from producer gas of shale-processing plants with the production of finished products

Abstract

This article describes a method for the desulfurization of fuel gases produced in shale gasification with a low hydrogen sulfide to carbon dioxide ratio. The solution from the absorber is fed by a pump into vertical hollow regenerators with a diameter of 3m and a height of 40m for regeneration. The solution irrigates the absorber by gravity flow after passing through the regenerators upward from the bottom in cocurrent with air. The sulfur formed on regeneration of the solution is floated up by air and in the form of froth flows down into the froth collector, from which it runs into the drum vacuum filter. A part of the hydrogen sulfide trapped is oxidized to sodium thiosulfate during regeneration. The cleaned gases containing up to 600 ppm of hydrogen sulfide are used as fuels, and the removal of hydrogen sulfide from producer gas enables the tenfold reduction of sulfur dioxide emission into the atmosphere.