A coking desulfurization waste liquid pretreatment device

Abstract

The invention discloses a coking desulfurization waste liquid pretreatment device belonging to the technical field of coking desulfurization waste liquid treatment equipment and being used for rapidly removing sulphur and pigment in a coking desulfurization waste liquid. The technical scheme is as follows: a liquid inlet pipeline of a pressure pump and a liquid inlet pipeline of a water jet machine are respectively connected with a liquid outlet of a flotation tank; a liquid outlet pipeline of the pressure pump and a liquid outlet pipeline of the water jet machine are respectively connected with a liquid inlet of a dissolved air tank; a liquid outlet pipeline of the dissolved air tank is connected with the floatation tank; an infusion pipeline of a dosing tank is connected with the flotation tank through a dosing pump; and a sediment scraper is arranged on the flotation tank. According to the invention, the desulfurization waste liquid containing a surfactant is pressurized and subjected to air dissolution and is released at reduced pressure through an aeration head, then, air bubbles formed by the surfactant can be used for efficiently adsorbing and separating organic matters, suspended solids and metal ions, and dross can be removed by the sediment scraper, so that the aim for pre-treating the waste liquid is achieved. The coking desulfurization waste liquid pretreatment device is low in byproduct yield and capable of avoiding generating a great number of active carbon wastes in an active carbon decoloring technology, and has the advantages of simple structure and good use effect.

Description

technical field [0001] The invention relates to a decolorization and desulfurization device for pretreatment of coking desulfurization waste liquid, and belongs to the technical field of coking desulfurization waste liquid treatment equipment. Background technique [0002] During the desulfurization process of coking production, secondary salts such as thiocyanate, thiosulfate and sulfate are continuously produced in the desulfurization circulating liquid, and part of the desulfurization mother liquid must be replaced regularly. Since the COD content of the replaced desulfurization waste liquid is very high, it must be treated before it can be discharged. The main processing steps currently used are thermal decolorization, vacuum evaporation and freeze crystallization operations. This treatment method will produce a large amount of activated carbon waste in the thermal decolorization process, for a design gas generation of 70000Nm 3 / h coking plant uses 1.5t / d of activated...

AI Technical Summary

Problems solved by technology

This treatment method will produce a large amount of activated carbon waste in the thermal decolorization process, for a design gas generation of 70000Nm 3 / h coking plant uses 1.5t / d of activated carbon to treat desulfurization waste liquid. These activated carbons are difficult to recycle after being used as decolorizers and can only be blended into coal blending, so the cost consumption is very high

And the decolorization time of activated carbon heating is about 4 hours, the treatment time is long, the decolorization effect is better on the removal of metal ions and organic matter, and the adsorption of elemental sulfur is low, and the existence of elemental sulfur has adverse effects on the subsequent freezing and crystallization of waste liquid

In order to overcome the problems of long heating decolorization time of activated carbon and low removal rate of waste liquid suspension flow, it is necessary to improve the current decolorization equipment

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