Treatment process of coking desulfurization by-product

Abstract

The invention discloses a coking desulfurization byproduct treatment process which comprises the following steps: performing solid-liquid separation on sulfur foam led out from a regeneration tower, returning most of separated liquid to a desulfurization system, feeding a small part of separated liquid into a waste liquid conversion reactor, feeding separated solid into a sulfur melting kettle for melting, feeding upper-layer liquid obtained by melting into the waste liquid conversion reactor, and feeding the upper-layer liquid into a desulfurization tower; introducing lower-layer liquid sulfur into a liquid sulfur storage tank through a liquid sulfur filter, adding concentrated sulfuric acid into the reactor, reacting, filtering a bottom liquid phase through the liquid sulfur filter, feeding into the liquid sulfur storage tank, adding a catalyst and a decolorizing agent, continuously reacting, filtering the liquid phase to obtain an ammonium sulfate solution after the reaction is completed, and recycling ammonium sulfate in an ammonium sulfate mother liquor tank. Feeding the solid phase into a coal yard for coal blending and coking treatment; tail gas generated in the whole process and sulfur in a liquid sulfur storage tank are pressurized through a pump and then fed into an incinerator, high-temperature tail gas obtained after incineration is washed and purified after waste heat recovery, the purified tail gas is dried and then fed into a converter and an absorber to prepare sulfuric acid, and the waste gas is discharged after being treated through a washing tower and reaching the standard.

Description

technical field [0001] The invention relates to a treatment process for by-products of coking desulfurization, in particular to a treatment process for sulfur foam obtained from a regeneration tower in the coke oven gas wet desulfurization process; it belongs to the technical field of coking. Background technique [0002] Coke oven gas is currently widely used in the wet desulfurization process using HPF and PDS as catalysts. During the desulfurization process, two difficult-to-handle substances will be produced. One is low-quality sulfur, which exists in the form of sulfur paste or molten sulfur. One is desulfurization waste liquid. Coking low-quality sulfur contains coal powder, tar and other substances, so even after it is processed by molten sulfur, its color is still black and has no economic value. Therefore, this low-quality sulfur is usually sold at an upside-down or low price. Desulfurization waste liquid is a mixture containing a variety of toxic substances, which...

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Problems solved by technology

[0005] The present invention aims to provide a treatment process for coking desulfurization by-products, which can be processed to obtain sulfuric acid and ammonium sulfate products, so as to solve the existing problems of large investment, high treatment cost, poor operation process stability and difficult treatment of dilute acid technical problems

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