System for realizing high-efficient low-NOx mixed combustion of gasification carbon residues in cyclone furnace

Abstract

The invention discloses a system for realizing high-efficient low-NOx mixed combustion of gasification carbon residues in a cyclone furnace. A water cooling pipe nest is arranged at the center of thecyclone cylinder, fireproof materials are applied on the water cooling pipe nest to form a liquid slag membrane, so that the ash-retention rate of the cyclone furnace is increased, and the gasification carbon residues are seized for wall adhering combustion; a pipe sleeve is arranged on the outer wall of the center water cooling pipe nest; a center powder feeding sleeve pipe sleeve penetrates through a combustor and extends to the liquid slag membrane at the middle part of the center water cooling pipe nest to start to form a region; the gasification carbon residues are preheated by the centerpowder feeding sleeve pipe sleeve, and then are integrally transported into a high temperature region of the cyclone cylinder; through an air membrane separator, a high-oxygen-concentration air current is generated to be transported to the center powder feeding sleeve pipe to assist the gasification carbon residues to fire and combust, and the generated low-oxygen-concentration air current is used for performing supplementary secondary air to enable deep air separation effects of the cyclone cylinder to form, so that the fuel NOx generation quantity is reduced; and steam and slag water generated by cooled liquid slags are used in a powder making system to increase the energy utilization efficiency of the cyclone furnace. According to the system disclosed by the invention, high-efficient low-NOx combustion of the gasification carbon residues in the cyclone furnace can be realized, the ash-retention rate and the energy utilization efficiency of the cyclone furnace are increased.

Description

technical field [0001] The invention belongs to the field of thermal power generation energy saving and emission reduction, in particular to a cyclone furnace with high efficiency and low NO x The system of blending and burning gasification residual carbon is suitable for recycling the ash produced in the process of coal gasification. Background technique [0002] Coal gasification technology is a clean and efficient technology for coal utilization. Currently, it occupies a large market in coal utilization. However, due to the limitation of the process principle, a large amount of unburned residual carbon is produced during the coal gasification process, which solves the problem that gasification residual carbon is difficult to utilize. The problem has great significance for the development of coal gasification process. [0003] Compared with raw coal, gasification residual carbon has finer particle size, higher ash content and ultra-low volatile content, and has higher ine...

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Problems solved by technology

[0002] Coal gasification technology is a clean and efficient technology for coal utilization. Currently, it occupies a large market in coal utilization. However, due to the limitation of the process principle, a large amount of unburned residual carbon is produced during the coal gasification process, which solves the problem that gasification residual carbon is difficult to utilize. The problem has great significance for the development of coal gasification process

[0003] Compared with raw coal, gasification residual carbon has finer particle size, higher ash content and ultra-low volatile content, and has higher inertness and NO x The conversion rate, although the ash content has little effect on the combustion of the general cyclone boiler, and can meet its combustion temperature, but the finer particle size makes it difficult to burn out due to the short residence time in the cyclone. In addition, how to reduce the NO of the cyclone furnace x Emissions are also becoming a new issue

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