Pyrolysis device for processing desulfurization waste liquid in partial oxidation environment

Abstract

The invention discloses a pyrolysis device for processing desulfurization waste liquid in a partial oxidation environment. The pyrolysis device comprises a pressure-bearing housing, a jacket, an insulating layer and a refractory brick which are arranged from outside to inside and connected together, and a gas separation section I, a spray pyrolysis section II, a mixed flow pyrolysis section III, an inactive salt pyrolysis section IV and a pyrolysis salt chilling section V are communicated from top to bottom to treat the desulfurization waste liquid in the partial oxidation environment. The device adopts a segmental treatment mode, so that decomposition of aromatic compounds and organic matters in the desulfurization waste liquid is ensured in the partial oxidation environment, COD and sulfides in the generated wastewater are reduced, meanwhile, pyrolysis of the inactive salt in the desulfurization waste liquid in the reducing atmosphere is ensured; therefore, the pollution problem of the desulfurization waste liquid is thoroughly solved and effective components in the desulfurization waste liquid can be recycled.

Description

technical field [0001] The invention relates to a pyrolysis device for treating desulfurization waste liquid, in particular to a pyrolysis device for harmless treatment of coking wet desulfurization waste liquid. The invention belongs to the technical field of chemical wastewater recovery and its treatment. Background technique [0002] With the rapid development of the coking industry, coke oven gas has become a large-tonnage energy and chemical resource. Crude coke oven gas contains harmful substances such as sulfide and cyanide, which can easily cause catalyst poisoning and equipment corrosion in the subsequent deep processing section. Therefore, coke oven gas must be desulfurized and decyanidated for purification. [0003] At present, most coking enterprises in China use wet oxidation desulfurization devices. For example, the alkaline desulfurization device uses soda ash as the alkali source, the catalyst is oxidized and regenerated by air, and the effect of desulfuriz...

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Problems solved by technology

However, in this method, the molten solid formed by the sodium-containing auxiliary salt in the desulfurization waste liquid is quenched at the same time as the incineration gas, and secondary reactions are likely to occur, resulting in the loss of sodium salt; in addition, due to the defects of the reaction furnace itself , the residence time of desulfurization waste liquid is short in the reaction process, the decomposition is not complete, and it is easy to block the pipeline

[0009] In the existing publicly reported literature, the treatment methods and equipment for desulfurization waste liquid are mainly to recover secondary salts. Generally, multi-effect evaporation crystallization equipment and a large number of steam heat sources can realize the step-by-step recovery of secondary salts, which increases the treatment cost; and the obtained secondary salts The quality and purity of salt are difficult to guarantee, and there is no price in the market, resulting in a backlog of products and increasing management costs

In addition, if the evaporated wastewater is not treated, its COD, nitrogen content, sulfide and other indicators still cannot meet the requirements of the water inlet of the coking biochemical treatment process, and further in-depth treatment is required, which will increase investment and operating costs, making it difficult to promote in a large area

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