Method and device for co-production of coal gas and semi-coke by atmospheric-pressure high-temperature pyrolysis of pulverized coal with oxygen-enriched oxidation

Abstract

The invention relates to a powered coal comprehensive utilization technology, and aims at providing a method and device for co-producing coal gas and semi-coke from powdered coal through normal-pressure high-temperature cracking rich-oxygen gasification. In the device, an annular spray nozzle is arranged on the furnace top of a high-temperature cracking gasification furnace; a gasification agent spray opening is formed in the center; the furnace bottom is a coarse coal gas and semi-coke mixture outlet; a plurality of pairs of gasification agent spray openings are formed in the side wall of a furnace liner in the axial direction and is used for conveying in the gasification agent in a sectioned way; a bottom outlet is connected to the high-temperature gas-solid separator; the high-temperature gas-solid separator is provided with a semi-coke outlet and a coarse coal gas outlet; the coarse coal gas outlet is connected to a coal gas purification device through a pipeline. Through the normal-pressure gasification method, the powdered coal takes cracking and gasification reaction at high temperature; the coal gas and the semi-coke are generated; tar is not produced. The volume percentage of the effective gas ingredient in the coal gas can reach 90 percent or higher. The thermal value of coal gas is high. The method and the device have the advantages that the system is simple; the investment is low; the coal type adaptability is wide; the product can be directionally regulated and controlled and the like. The existing powdered coal furnace can be modified without great modification; economical and environmental-friendly effects are achieved; the popularization is facilitated.

Description

technical field [0001] The invention relates to the field of high-efficiency comprehensive utilization of pulverized coal, in particular to a method and device suitable for atmospheric-pressure high-temperature cracking of pulverized coal with oxygen-enriched oxidation for co-production of gas and semi-coke. Background technique [0002] my country's energy reserves are dominated by coal, and there is a serious shortage of oil and natural gas resources. During the application of coal, 80% of the coal is burned directly, which not only has extremely low utilization efficiency but also causes serious environmental pollution. Therefore, regarding coal as a resource, the development of coal polygeneration technology can simultaneously solve the shortage of natural gas resources and the increasingly serious air pollution problem in China. The polygeneration technology with partial coal gasification as the core is to extract the part of pulverized coal that is easy to pyrolyze an...

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Problems solved by technology

However, high-pressure operating conditions have high requirements for the processing and operation and maintenance of entrained bed equipment, so such equipment systems are complex and expensive, which is not conducive to the wide application of this type of technology

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