Coke oven gas complex iron desulfurization recycling process method and device

Abstract

The invention discloses a coke oven gas complex iron desulfurization recycling process method and device. The device comprises a primary desulfurization tower, a secondary desulfurization tower, a rich liquid tank, a regeneration tower, a sulfur foam tank, a centrifugal filter, a filtrate tank, a sulfur paste pulping tank, a sulfur melting kettle, a crude liquid sulfur buffer tank, a liquid sulfur filter, a liquid sulfur filtrate tank, a tar evaporation kettle, a liquid sulfur gasification kettle, a refined liquid sulfur buffer tank, a slicing machine and a clear liquid flash tank. The coke oven gas complex iron desulfurization recycling technology is adopted, the long-standing problems of a wet oxidation desulfurization device are thoroughly solved from the three angles of waste liquid elimination, desulfurization liquid purification and sulfur paste refining, and the sulfur product obtained by sulfur paste refining and recycling reaches the industrial sulfur superior product grade; in addition, the whole coke oven gas complex iron desulfurization recycling technology can realize automation, continuity and no secondary pollution, and is especially suitable for treatment of a large amount of sulfur paste as a byproduct of a wet oxidation desulfurization device in the fields of coal coking gas, petrochemical gas and the like.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification and product recycling, and in particular relates to a coke oven gas complex iron desulfurization recycling process method and device. Background technique [0002] At present, the coking oven gas desulfurization commonly used in the coking industry is the wet oxidative desulfurization process. The existing coke oven gas desulfurization adopts the HPF desulfurization process with PDS catalyst as the core. 2 The removal selectivity of S is low, and it is easy to generate a large amount of desulfurization waste liquid, and the generated waste liquid is subsequently used for resource utilization through salt extraction or acid production. The investment and operation costs are huge, and it is easy to cause secondary pollution. In order to eliminate the problem of coking desulfurization waste liquid as much as possible, complex iron catalysts are used to replace PDS catalysts in exis...

AI Technical Summary

Problems solved by technology

However, after the complex iron catalyst is used, the original HPF desulfurization unit no longer discharges the desulfurization liquid, and the tar, phenols, thiocyanate and formate accumulated in the desulfurization liquid system due to the coke oven gas feed can only be Part of the tar and coke residue are taken away through the sulfur paste, and the continuous accumulation of oil phenols in the system will cause the sulfur foam to become weak, and the accumulated salts will increase the specific gravity of the desulfurization liquid and even block the tower

[0003] In addition, the sulfur paste for desulfurization by complex iron cannot be obtained by using traditional molten sulfur. The black sulfur produced by melting sulfur is hazardous waste and is not suitable for transfer. The rational disposal of sulfur paste will increasingly restrict the production of coking

Therefore, whether it is PDS desulfurization + salt extraction or acid production process, or complex iron desulfurization process, in fact, the problems existing in coke oven gas desulfurization have not been completely solved

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