Coupling method of pulverized coal fluidized bed hydropyrolysis and gasification

Abstract

A hydropyrolysis and gasification coupling method for a powdered coal fluidized bed is disclosed. According to the method, in a first step, a heat source of a hydropyrolysis furnace of the powdered coal fluidized bed is synthesis gas from a gasification furnace, a hydrogen source comprises following two parts: (1) hydrogen in the synthesis gas and (2) hydrogen prepared by purification of gas produced in a system; in a second step, most of solid semicoke produced by hydropyrolysis is directly fed into a semicoke hopper through a coke guiding pipe, and a small part of the semicoke with a small particle size is fed into a cyclone separator together with pyrolysis gas, the semicoke enters the semicoke hopper after separation by the cyclone separator; and in a third step, a raw material of the gasification furnace is the semicoke prepared by the hydropyrolysis, the semicoke and a gasifying agent are subjected to a gasification reaction according to a certain ratio in a gasification reactor to produce high-temperature synthesis gas, and the high-temperature synthesis gas is adopted as the heat source and the hydrogen source of the hydropyrolysis furnace of the powdered coal fluidized bed. Quality of tar obtained by hydropyrolysis of coal is good. The content of obtained effective gas is high.

Description

technical field [0001] The invention relates to a coupling method, in particular to a pulverized coal fluidized bed hydropyrolysis and gasification coupling method. Background technique [0002] At present, domestic coal mines generally adopt mechanical coal mining, and the proportion of pulverized coal in the mined coal is about 40% to 45%. How to use this part of coal has become a bottleneck restricting the development of coal chemical industry. Direct use of pulverized coal for power generation not only seriously pollutes the environment Coal utilization efficiency is low; pulverized coal is directly gasified, and high value-added substances in coal have not been proposed, which is not conducive to the comprehensive utilization of coal resources; the tar obtained by traditional coal pyrolysis method is not only low in yield, but also high in heavy components , It is not conducive to the follow-up processing of tar, and the price of powder coke is low, and the follow-up ut...

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Problems solved by technology

[0002] At present, domestic coal mines generally adopt mechanical coal mining, and the proportion of pulverized coal in the mined coal is about 40% to 45%. How to use this part of coal has become a bottleneck restricting the development of coal chemical industry. Direct use of pulverized coal for power generation not only seriously pollutes the environment Coal utilization efficiency is low; pulverized coal is directly gasified, and high value-added substances in coal have not been proposed, which is not conducive to the comprehensive utilization of coal resources; the tar obtained by traditional coal pyrolysis method is not only low in yield, but also high in heavy components , which is not conducive to the subsequent processing of tar, and the price of powdered coke is low, making subsequent utilization difficult

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