Method and device for preparing sulfur by recovering hydrogen sulfide gas from viscose waste gas

Abstract

The invention discloses a method and a device for preparing sulfur by recovering hydrogen sulfide gas from viscose waste gas. The method comprises the following steps: preparing a washing solution from ethylenediamine tetraacetic acid, triethanolamine, ferrous sulfate, sodium carbonate and water; pumping the washing solution into an H2S washing tower for spraying, introducing viscose waste gas through the bottom of the washing tower and realizing full contact of the waste gas with the washing solution in a countercurrent mode, and absorbing hydrogen sulfide gas in the viscose waste gas by thewashing solution; conveying enriched elemental sulfur containing liquid flowing out of the bottom of the washing tower into a centrifugal machine; conveying concentrated sulfur slurry separated by thecentrifugal machine into a sulfur recovery device; heating sulfur to 135 DEG C in the sulfur recovery device and thenmelting into liquid sulfur, conveying pure sulfur liquid into a sulfur granulator,separating into small liquid drops and cooling to 50 DEG C for solidification to obtain sulfur particles. The method has the beneficial effects that hydrogen sulfide is selectively treated, a large amount of detergent is not consumed, heating and pressurizing are not needed, and the hydrogen sulfide gas can be recycled from the viscose waste gas to prepare sulfur.

Description

technical field [0001] The invention belongs to the field of hydrogen sulfide treatment technology, and in particular relates to a method and a special device for recovering hydrogen sulfide gas from viscose waste gas to produce sulfur. Background technique [0002] In the prior art, for CS 2 and H 2 The treatment methods of S mixed gas are as follows: [0003] 1. Separate treatment method, using alkaline absorbent (such as NaOH, Na 2 CO 3 , or NaHCO 3 aqueous solution) to absorb the H 2 S, and then use adsorbent (activated carbon or activated fiber) to absorb the CS 2 That is, alkali washing + adsorption method. The disadvantage is that the by-product sodium hydrosulfide needs to be concentrated, and a large amount of sulfur-containing wastewater and miscellaneous salts are easily produced. [0004] 2. Recovery of sulfur by the Claus method: making CS in the waste gas in the Claus incinerator 2 and H 2 S oxidation to SO 2 , the generated SO 2 with H in the intak...

AI Technical Summary

Problems solved by technology

The disadvantages are: the by-product sodium hydrosulfide needs to be concentrated, and it is easy to produce a large amount of sulfur-containing wastewater and miscellaneous salts

[0007] Claus Act requires CS in exhaust 2 and H 2 The initial concentration of S should be greater than 7-15g / Nm³, otherwise, the incineration cannot supply the heat required for the reaction and cannot maintain the temperature required for the normal reaction

[0008] The above-mentioned treatment method is complex in process, high in cost, large in energy consumption and low in recovery rate

Images