Entrained-flow bed coal gasification fine slag black water multi-energy-field synergistic efficient dehydration method

Abstract

The invention discloses an entrained-flow bed coal gasification fine slag black water multi-energy-field synergistic efficient dehydration method which comprises the following steps: treating gasifiedfine slag obtained from a gasification furnace through a venturi scrubber to obtain black water, and concentrating the black water in a concentration tank; pumping the black water into a vacuum forcefield dehydration system, and performing dehydrating to obtain a filter cake; conveying the filter cake to a vibration and pressure coupling force field dehydration system through a belt conveyor forfurther dehydration; conveying the filter cake to a hot flue gas drying system through a belt conveyor for further dehydration, and carrying out heat exchange on the filter cake and hot flue gas forfurther dehydration; mixing water removed by the vacuum force field dehydration system into factory water for recycling; and conveying a filter cake obtained by the hot flue gas drying system to a power boiler section for blending combustion and decarburization with raw coal. According to the method, the low-moisture filter cake capable of meeting transportation and pulverization requirements is finally obtained, the problem of soil and underground water pollution caused by filter cake landfill is reduced, and meanwhile efficient and clean utilization of coal-series solid waste resources is achieved.

Description

technical field [0001] The invention relates to a method for dehydrating gasified fine slag black water, in particular to an air-flow bed coal gasification fine slag black water multi-energy field synergistic high-efficiency dehydration method. Background technique [0002] Coal has an important strategic position in my country's national economic and social development, and it is an important primary energy source in the world, accounting for 27.62%. Gasification technology is one of the core technologies for efficient and clean conversion of coal. In modern coal chemical production, processes such as coal-to-chemicals, coal-to-natural gas, coal-to-liquid fuels, and IGCC all use coal gasification as the source. China consumes more than 250Mt of coal for the gasification industry, and coal-based solid waste has become one of the most important sources of industrial solid waste in my country. At present, large-scale gasification devices mostly use coal water slurry or pulver...

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