Purification method and device for short-process coal gasification black water

Abstract

The invention relates to a purification method and device for short-process coal gasification black water. The purification method for the short-process coal gasification black water comprises the following steps: (i) allowing the short-process coal gasification black water to enter a jet flash separator for flash evaporation treatment; (ii) feeding the short-process coal gasification black water having been subjected to jet flash evaporation treatment to a micro-cyclone separator for preliminary centrifugal separation; (iii) sending the short-process coal gasification black water primarily purified by the micro-cyclone separator to a fluidized-bed separator for secondary purification; (iv) sending the short-process coal gasification black water deeply purified by the fluidized-bed separator to a deaerator for deoxygenation; and (v) after the fluidized-bed separator operates for a period of time and a pressure difference is 0.3 MPa, mixing the recycled short-process coal gasification black water and nitrogen and reversely feeding the obtained mixture to regenerate the separation medium of the fluidized-bed separator. The invention further provides the purification device for the short-process coal gasification black water .

Description

technical field [0001] The disclosure belongs to the technical field of refractory sewage treatment and reuse, and provides a method for purifying coal gasification black water, which is suitable for removing solid particles in gasification black water. Specifically, the present disclosure provides a short-process coal gasification black water purification method and device in combination with jet flash evaporation, cyclone separation and fluidized bed separation technologies. Background technique [0002] The coal gasification process uses coal or coal char as raw material, uses oxygen, water vapor or hydrogen as gasification agent, and converts the combustible part of coal or coal char into gas fuel or downstream raw material through chemical reaction under high temperature conditions. . At present, entrained bed is the mainstream coal gasification technology in China. Although the new gasification process has been industrialized on a large scale and can operate stably fo...

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Problems solved by technology

[0011] This disclosure provides a novel short-process coal gasification black water purification method and device, which has an excellent separation effect on fine particles in gasification black water, and at the same time, the equipment has a long stable operation period, low cost, and a simple separation process, thereby solving the problem of The existing process has the defects of complex process, large amount of waste water discharge, fresh water supplement and incomplete removal of solid particles

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