A lignite semi-coke lean oxygen combustion boiler

Abstract

The invention discloses a lignite semi-coke oxygen-lean combustion boiler, which comprises a plurality of cyclone oxygen-lean combustion devices and a boiler body; the boiler body includes a second combustion chamber, a boiler heating surface and a smoke exhaust port arranged on the upper part of the second combustion chamber; the cyclone The lean-oxygen combustion device is an inverted adiabatic cyclone separator with a central cylinder; the cyclone lean-oxygen combustion device is connected to the secondary combustion chamber of the boiler body. Lignite semi-coke powder enters the annular space between the central cylinder and the cyclone in a tangential or tangential direction under the action of the primary air, and forms a high-temperature combustion gasification zone in the lower part of the annular space. In this zone, the excess air coefficient is kept less than 1. Maintain the reaction in an oxygen-depleted combustion atmosphere; the flue gas containing combustible gas enters the secondary combustion chamber, and is fully burned to generate high-temperature flue gas that goes up through each heating surface of the boiler in a tower arrangement to complete heat transfer and reduce the flue gas to a certain level temperature. The invention has high combustion intensity, high slag collection rate, low pollutant discharge and wide load adjustment range.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a lignite semi-coke oxygen-poor combustion boiler. Background technique [0002] Lignite is a low-rank coal with huge reserves in my country and the world. However, lignite has high water content, high volatile matter, easy spontaneous combustion, and is not conducive to transportation, which restricts the large-scale utilization of lignite. It is of great significance for the development of lignite to improve the quality of lignite and comprehensively utilize it by classification and quality. [0003] In the field of lignite utilization, medium and low temperature pyrolysis technology is a more promising technology for the utilization of lignite by classification and quality. The pyrolysis solid product lignite semi-coke is a kind of better fuel due to the reduction of volatile matter, moisture content and calorific value. The high-efficiency and low-pollution utilization of li...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a lignite semi-coke oxygen-depleted combustion boiler to solve the problems of low combustion intensity, narrow load adjustment range and excessive pollutant discharge in the existing pulverized coal furnace boiler; the boiler of the present invention has high combustion intensity, slagging High efficiency, low pollutant discharge, wide load adjustment range, etc.

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