Device and method for synchronous catalytic oxidation and decoloration of coking desulfurization waste liquid

Abstract

The invention discloses a device and method for synchronous catalytic oxidation and decoloration of coking desulfurization waste liquid, wherein the device comprises a device shell, the upper portionof the device shell is a columnar area, the lower portion of the device shell is a conical area, the columnar area is of a jacket type structure, a heating spiral pipe is arranged in the jacket type structure, and a compressed air spraying pipeline is arranged on the lower portion of the columnar area; a desulfurization waste liquid inlet, a catalyst feeding port and a tail gas outlet are formed in the upper part of the device shell, a desulfurization waste liquid outlet is formed in the device shell below the heating spiral pipe, and a solid discharge port is formed in the bottom of the conical area. According to the invention, two processes of oxidation and decoloration of thiosulfate in the coking desulfurization waste liquid are synchronously realized in one device by adopting a catalyst with dual functions of catalysis and decoloration, and the traditional motor stirring effect is replaced by the desulfurization waste liquid spraying or swirling effect and the compressed air turbulence effect, so that the consumption of steam or a heating medium is reduced; the heat utilization rate is obviously improved; the device utilization rate is improved, the occupied area is reduced, and continuous production can be realized.

Description

technical field [0001] The invention belongs to the field of coal chemical wastewater treatment and resource recycling, and in particular relates to a device and method for synchronous catalytic oxidation and decolorization of coking desulfurization waste liquid. Background technique [0002] The scientific and rational treatment or comprehensive utilization of coking desulfurization waste liquid is an environmental protection problem that coking enterprises need to solve urgently. At present, most coking enterprises in China adopt HPF catalytic wet oxidation method and a few coking enterprises adopt technologies such as tannin extract method to remove H from coke oven gas. 2 S and HCN, the above process has low cost and high desulfurization and decyanation efficiency, but a large amount of desulfurization waste liquid will inevitably be generated during operation. The desulfurization waste liquid contains a large amount of inorganic side salts such as thiocyanate, thiosulf...

AI Technical Summary

Problems solved by technology

However, both the decolorization and oxidation sections require steam heating and pressure filtration operations, which cause problems such as low steam utilization rate, repeated pressure filtration, cumbersome operation, large floor area and low utilization rate of the device; at the same time, the oxidation and decolorization process must be stirred, The desulfurization waste liquid itself is highly corrosive and easy to corrode. The stirring impeller causes frequent maintenance

In addition, the desulfurization waste liquid oxidation section mainly uses concentrated H 2 SO 4 Oxidation or air oxidation, the former is demanding on equipment materials and produces SO 2 Reduce the recovery rate of secondary salt and easily cause secondary pollution, while the oxidation efficiency of the latter is low

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