Ignition-under-bed combustion device with air cooling structure for circulating fluidized bed boiler

Abstract

The invention relates to a circulating fluidized bed boiler, in particular to an ignition-under-bed combustion device with an air cooling structure for the circulating fluidized bed boiler, and belongs to the technical field of circulating fluidized bed boilers. The ignition-under-bed combustion device comprises a combustion chamber and an oil combustor, wherein the combustion chamber comprises a combustion chamber outer cylinder body and a combustion chamber inner cylinder body positioned on the inner side of the combustion chamber outer cylinder body, and an air mixing chamber used for cooling the combustion chamber inner cylinder body is arranged between the combustion chamber outer cylinder body and the combustion chamber inner cylinder body; a mixed air inlet communicated with the air mixing chamber is formed in the side wall of the combustion chamber outer cylinder body; a plurality of primary air mixing openings are formed in the middle of the side wall of the combustion chamber inner cylinder body, and a plurality of secondary air mixing openings are formed in the rear part of the side wall of the combustion chamber inner cylinder body. Mixed air passes through a part between the combustion chamber inner cylinder body and the combustion chamber outer cylinder body, so that the surface temperature of the outer cylinder body can be effectively lowered, the dissipation heat loss is reduced, and the ignition efficiency is improved. Meanwhile, the mixed air is sent to the combustion chamber through two layers, so that the theoretical combustion temperature is effectively lowered, and the NO<x> emission is reduced.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to an under-bed ignition and combustion device with an air-cooled structure for a circulating fluidized bed boiler, belonging to the technical field of circulating fluidized bed boilers. Background technique [0002] At present, with the development of circulating fluidized bed boiler technology, circulating fluidized bed boilers are more and more widely used due to their advantages of high efficiency, environmental protection, and wide adaptability to coal types. Generally, light oil under the bed is used for ignition of circulating fluidized bed boilers. Under-bed light oil ignition is widely used because of its high ignition success rate and fuel-efficient ignition. However, due to the high theoretical combustion temperature of ignition, the temperature outside the ignition cylinder is always high, and the NOX emissions produced by the combustion are also high, which cannot me...

AI Technical Summary

Problems solved by technology

Under-bed light oil ignition is widely used because of its high ignition success rate and fuel-efficient ignition. However, due to the high theoretical combustion temperature of ignition, the temperature outside the ignition cylinder is always high, and the NOX emissions produced by the combustion are also high, which cannot meet the increasingly stringent environmental protection requirements.

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