Self-drying quality-divided utilization system and method for coal gasification slag

Abstract

The invention discloses a coal gasification slag self-drying quality-divided utilization system and method, and the method comprises the steps: carrying out preliminary separation on a coal gasification slag raw material through a screening machine, taking a high-ash-content oversize product as a tailing product, and enabling an undersize product to continuously pass through a grading cyclone to realize carbon-ash separation; overflow of the grading cyclone is fed into a settling tank for treatment, bottom flow of the grading cyclone is separated by a separator to obtain a heavy product and a light product, the heavy product is screened to obtain an oversize product as a tailing product, and an undersize product is fed into the settling tank; screening the light product to obtain an oversize product, dehydrating the oversize product as clean coal, and feeding an undersize product into a settling tank; feeding underflow of the settling tank into a dehydrator for dehydration to obtain middling coal; and the low-quality middling coal is directly combusted to deeply dehydrate the clean coal, and a final high-quality clean coal product is obtained. According to the technical scheme provided by the invention, graded and quality-divided large-scale resource utilization of the coal gasification slag can be realized, and energy recycling can be realized while environmental pollution can be effectively reduced.

Description

Technical field [0001] The present invention is a technology field of coal chemical solid waste resource treatment, and specially involves a system and method of using the self -drying of gas dregs. Background technique [0002] With the rapid development of coal chemical technology, the annual gasification slag produces huge amount of gas. Gas gasification is a by -product generated during the gasification process, which mainly includes gasification coarse residue and gasized fine residue. Among them The characteristics of high gray are still contained in a small amount of fixed carbon, which can be directly used in the fields of construction, roads and bridges after decarburization; gasification dregs are not yet available. The formation of large -scale industrialization applications is urgent and effective to realize its large -scale resource utilization. [0003] As a solid waste, gasification ash, the current main treatment method is landfill and mixing; of which, landfill t...

AI Technical Summary

Problems solved by technology

In engineering practice, for the convenience of transportation, gasification coarse slag and gasification fine slag are often mixed and loaded into trucks. Faced with this actual situation, the above-mentioned single treatment method can no longer meet the needs of the project; at the same time, due to the developed pores, the gasification slag High, how to efficiently and deeply dehydrate has always been a problem that plagues the comprehensive utilization of gasification slag (explanatory, the product obtained by physical dehydration method, especially the high-carbon filter cake, still has a moisture content of 60% to 70%, and drying dehydration is an effective method. The deep dehydration method, but the conventional drying method consumes resources such as steam, which has high energy consumption, high cost and poor economy)

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