Coal gasifier for slag granulation and coal gas preparation process

Abstract

The invention discloses a coal gasifier for slag granulation and a coal gas preparation process. The coal gasifier is mainly composed of a pressure-bearing housing, a slag film gasification device, an annular chamber structure slag basin, a quenching chamber, a conduit, a convection cooling section and the like. The process comprises the following steps: with pulverized dry coal or coal water slurry as a raw material, feeding the raw material to a gasification chamber to burn and gasify together with a gasifying agent from a vortex gasification burner; enabling formed liquid slag to collide with the wall surface of the gasification chamber under the vortex action, and flowing from bottom to top under the action of gravity; feeding to the slag basin of the annular chamber structure, carrying out further gasification reaction together with oxygen fed from the upper part of the slag basin, and discharging from a slag discharge hole; feeding coal gas main airflow to the quenching chamber together with liquid drops, cooling to a specific temperature, and then conveying to the convection cooling section to further lower temperature through the conduit; finally removing dust, purifying and then outputting. The liquid slag drops penetrating through the slag basin are cooled to form solid particles and are collected by a dry slag collector; and the heat is recovered by a slag cooler.

Description

technical field [0001] The invention relates to a coal gasification device and a coal gasification method for energy and chemical industry, in particular to an entrained-flow bed coal gasification device and method. Background technique [0002] Coal gasification technology is widely used in coal-to-oil and gas, chemical synthesis, iron and steel metallurgy, combined cycle power generation, fuel cells and other fields. Coal gasifier is the leading equipment of coal-based energy chemical industry. In recent decades, it has received widespread attention and formed various technologies. Fixed-bed gasification technology, fluidized-bed gasification technology and entrained-bed gasification technology have all been developed and industrialized in foreign countries. [0003] The gasification temperature and gasification pressure of the entrained bed gasifier are high, the load is large, and the coal type is suitable for a wide range. It is the mainstream of the development of coa...

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Problems solved by technology

[0007] Aiming at the problems of high slag removal and dust removal strength, low thermal efficiency, high carbon content in residue, clogged slag pool, and short service life of the main burner in the wet method, the purpose of the present invention is to provide a slag granulation coal gasifier for dry slag removal and gas preparation method

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