A system and process for comprehensive utilization of coking low-quality sulfur and side salt of desulfurization liquid

Abstract

The invention provides a system and a process for comprehensively using coking low-quality sulfur and desulfurized solution secondary salt. The system comprises a centrifugal spray dryer, a heat pipe heat exchanger, a sulfur burning furnace, a waste heat boiler, a converter and an absorber, wherein the centrifugal spray dryer is used for drying sulfur foam containing elemental sulfur and the desulfurized solution secondary salt into mixed particles containing elemental sulfur and secondary salt crystals; the heat pipe heat exchanger recovers waste heat in flue gas to produce hot air required by the centrifugal spray dryer during drying; the sulfur burning furnace is connected with the centrifugal spray dryer and burns the mixed particles to generate high-temperature gas with the main ingredient being SO2; the waste heat boiler is connected with the sulfur burning furnace and comprises a heat pipe evaporation pipe and used for recovering heat of the high-temperature gas, so that the high-temperature gas is cooled to low-temperature gas with the main ingredient being SO2; the converter is connected with the waste heat boiler and used for converting SO2 in the low-temperature gas into SO3; the absorber is connected with the converter and used for absorbing SO3 and producing concentrated sulfuric acid.

Description

technical field [0001] The invention belongs to the field of resource utilization of coking waste. Specifically, the invention relates to a system and process for comprehensively utilizing low-quality sulfur and desulfurization liquid secondary salt produced by desulfurization of coke oven gas, which can be widely used in the coking industry. Background technique [0002] The coke oven gas produced by coke oven coking contains H 2 Harmful substances such as S and HCN, the function of the desulfurization process is to remove the H 2 S, HCN, most of which are H 2 S is converted into elemental sulfur, that is, sulfur, and the remaining H 2 S, HCN undergoes side reactions during the oxidation process to generate thiosulfate, thiocyanate and sulfate. Because the coke oven gas contains impurities such as tar, coal powder and coke powder, and the limitations of the process, the purity of the sulfur produced is only 70%-80%, and the color is dark gray, which is difficult to sell....

AI Technical Summary

Problems solved by technology

Due to impurities such as tar, coal powder and coke powder contained in coke oven gas, coupled with the limitations of the process, the purity of the sulfur produced is only 70%-80%, and the color is dark gray, which is difficult to sell

When the auxiliary salt dissolved in the desulfurization liquid reaches a certain concentration, it will seriously affect the absorption and regeneration capacity of the desulfurization liquid, resulting in a serious drop in desulfurization efficiency. Therefore, the auxiliary salt must be removed from the desulfurization liquid

[0003] The current general method for extracting auxiliary salts is extraction and separation by vacuum evaporation crystallization, but its energy consumption is large and the product market demand is small, and sales are difficult. Like low-grade sulfur, it forms solid waste and becomes a big burden on coking plants.

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