Multi-stage cyclic gasification device and method for carbon-containing solid particles

Abstract

The invention discloses a multi-stage circulating gasification device and method for carbon-containing solid particles. The gasification device comprises a reactor, a synthesis gas treatment system and a multi-stage circulating material returning system connected with the reactor; an enhanced reactor is arranged at the conical part of the reactor; gasifying agent inlets are formed in the cone topposition and the side edge of the conical part; the multi-stage circulating material returning system comprises a multi-stage solid particle circulating unit, and the carbon-containing solid particlesin crude synthesis gas discharged from the reactor are recycled through the multi-stage solid particle circulating unit and returned to the reactor to be subjected to circulating gasification; and the crude synthesis gas discharged from the multi-stage solid particle circulating unit is fed into the synthesis gas treatment system for subsequent processing. The conical part of the reactor is provided with a strengthening reactor so as to improve the conversion efficiency; the cone top position and the side edge of the conical part of the reactor are each provided with the gasifying agent inlet, and the strengthening reactor and the unique distribution form of the gasifying agent are combined, so the strength of the conical part of the reactor is improved, materials are guaranteed to be inmore uniform contact with a gasifying agent, and local over-temperature coking is avoided.

Description

technical field [0001] The invention belongs to the field of coal chemical industry and relates to a carbon-containing solid particle multi-stage circulation gasification device and method. Background technique [0002] Gasification technology is an effective way of clean and efficient utilization of coal. Fluidized bed gasification technology uses air, oxygen or oxygen-enriched steam as the gasification agent to make pulverized coal flow in the bed under appropriate coal particle size and gas velocity. Coal gasification, gas and solid are fully mixed and contacted, and coal gasification is carried out at high temperature. Compared with fixed bed gasification technology, fluidized bed gasification technology has small particle size of raw coal, large heat transfer area and high heat transfer efficiency, and the gasification efficiency and gasification intensity are significantly improved. But when the gas velocity in the bed reaches the conveying speed, the material will be...

AI Technical Summary

Problems solved by technology

But when the gas velocity in the bed reaches the conveying speed, the material will be continuously blown out of the bed, causing the carbon-containing material to leave the reactor without complete conversion.

In addition, due to the heterogeneity of materials in the gasifier and the inhomogeneity of the distribution of the air distribution system, it is easy to cause local overheating of the bottom of the furnace and cause coking, which leads to the failure of the gasifier to operate normally and affects the work efficiency.

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