Combustion device of W flame boiler and W flame boiler

Abstract

The invention discloses a combustion device of a W flame boiler and the W flame boiler. The combustion device comprises a pulverized coal pipeline, a pulverized coal concentration separation device, a pulverized coal airflow pipeline and a secondary air pipeline. The pulverized coal airflow pipe comprises a main air pipeline and an air lack pipeline; the tail end of the main air pipeline is provided with a main air spraying opening connected with a combustion chamber, and the tail end of the air lack pipeline is provided with an air lack spraying opening connected with the combustion chamber; the tail end of the secondary air pipeline is provided with a secondary air spraying opening connected with the combustion chamber; and the main air spraying opening, the air lack spraying opening and the secondary air spraying opening are formed in a furnace arch, and the air lack spraying opening is formed between the main air spraying opening and the secondary air spraying opening. The secondary air spraying opening is close to a front wall or a rear wall, and the main air spraying opening is close to a center of the combustion chamber. According to the combustion device of the W flame boiler and the W flame boiler, mixing of main air and secondary air is postponed, and generation of NOx is reduced; burning off of pulverized coal particles is ensured; and the problems that the pulverized coal particles of the W flame boiler are hard to ignite, hard to burn off, prone to scorification, and high in NOx emission are solved.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a combustion device of a W-flame boiler and a W-flame boiler. Background technique [0002] W Flame Boiler is a boiler specially designed to burn low-volatile coals, and has obvious advantages when burning low-volatile coals such as anthracite and low-quality lean coal. However, in the combustion process of W-flame boilers, there are generally problems such as poor burnout of pulverized coal, poor combustion stability, boiler slagging and high NOx emissions. In order to make the pulverized coal ignite in time, stably burn and reduce the amount of NOx in the furnace, W flame boilers often use fuel classification and air classification technology. [0003] At present, some W flame boiler burner nozzles adopt the direct current slit type, such as Figure 1A shown, and the burners are arranged in groups as Figure 1B shown. The air flow of pulverized coal and the seconda...

AI Technical Summary

Problems solved by technology

However, the nozzle arrangement of the burner makes the pulverized coal flow mixed with the secondary air in a large amount at the initial stage of ignition. In the early stage of fire, it is in a strong oxidizing atmosphere, which is not conducive to controlling NOx

Images