Process and device for recycling coked ammonium sulfate acid tar

Abstract

The invention belongs to the technical field of purification of coke-oven gas, in particular to a process and device for recycling coked ammonium sulfate acid tar. The process comprises the following steps of: spraying acid tar extracted from a full launder in an ammonium sulfate procedure with hot ammonia water which is subjected to heat exchange by using an ammonia steaming ammonia water heat exchanger at the temperature of 92-98 DEG C; mixing and introducing a mixture into an acid tar neutralizing tank; performing acid-alkali neutralization in the neutralizing tank; extracting mixed liquorof tar and ammonia water from the bottom of the front end of the neutralizing tank by taking a pump as power; introducing acid tar from the upper part of the back end of the tank into the neutralizing tank through the outlet of the pump to fully neutralize the acid tar; circulating for 30 minutes; pumping the mixed liquor into a coal gas sucking pipeline of a coke oven by using the pump; and introducing the mixed liquor into a mechanical ammonia water settling tank along with an ammonia water system to fulfill the aim of recycling the acid tar. The process and device are easy to operate and have low investment and running costs. By adopting the process and device, a heat source of ammonium steaming waste water is fully used for heating the acid tar, a large amount of steam is saved, and the acid tar can be directly taken as a product.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification, in particular to a recovery and treatment process and device for coking ammonium sulfate tar. Background technique [0002] At present, in the gas purification process of the coking plant, sulfuric acid is used to absorb NH in the gas 3 , because the gas also contains a small amount of tar, when the sulfuric acid solution is used to reversely spray the gas in the saturator, the NH 3 At the same time, part of the tar in the gas will also be washed down. Due to the difference in specific gravity, the tar floats on the top of the ammonium sulfate solution, and flows through the full flow tank with the ammonium sulfate solution. Most of the acid tar that comes out is treated as waste or mixed in the tar residue, which is treated as solid waste at a low price. A small number of qualified coking plants (with tar slag into ball coal blending process) go to the coal yard together wit...

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Problems solved by technology

The sour tar treatment method described in this article uses steam for steam blowing, which requires a large amount of steam consumption. At the same time, the treated wastewater contains a large number of fine tar particles. Relying on the dilution treatment in the adjustment tank, it cannot meet the national discharge standards. Consuming a large amount of industrial clean water, entering the sewage system will even paralyze the sewage treatment system

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