Oxygen-enriched burner and air distribution method thereof

Abstract

The invention relates to the technical field of energy, and discloses an oxygen-enriched burner and an air distribution method thereof. The burner comprises a combustion chamber, wherein a burnout air port, primary air ports and secondary air ports are formed in the wall of the chamber so as to form a line of air ports, the primary air ports and the secondary air ports are vertically formed below the burnout air port in the height direction of the combustion chamber at intervals, and the primary air ports are located between adjacent secondary air ports. The air distribution method of the oxygen-enriched burner comprises the steps of closing the burnout air port, and opening the primary air ports and the secondary air ports in the working condition of oxygen-enriched combustion; adjusting the volume of circulating smoke which enters a boiler and injected oxygen so as to adjust the oxygen partial pressure of the boiler; controlling a part of the injected oxygen to enter the primary air ports and the other part of the injected oxygen to enter the secondary air ports, and adjusting the oxygen partial pressure of primary air or secondary air; and controlling the momentum of the primary air to be the same as that of the primary air in the working condition of air combustion. According to the oxygen-enriched burner and the air distribution method, the high efficiency and stability of pulverized coal combustion are increased in the working condition from air combustion to oxygen-enriched combustion.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to an oxygen-enriched burner and an air distribution method thereof. Background technique [0002] The burner is the main combustion equipment of the pulverized coal boiler. Its function is to send the fuel and the combustion-supporting agent required for combustion into the furnace through the combustion nozzle according to a certain ratio, speed and mixing method, so as to ensure that the fuel can be fully mixed with the combustion-supporting agent after entering the furnace. , timely ignition, stable combustion and burnout. Its reasonable organization of airflow in the furnace is a prerequisite for stable and efficient combustion of pulverized coal. [0003] Burners are divided into two categories according to their outlet airflow characteristics, one is a direct-flow burner, and the outlet airflow is a direct-flow jet group. The other type is a swirl burner, and the outlet air...

AI Technical Summary

Problems solved by technology

Due to the change of the volume and composition of the gas entering the boiler, if the air distribution method used in the air combustion condition is still adopted, the flow field will change greatly, and it is difficult to form a good aerodynamic field in the furnace, resulting in poor combustion. Stablize

At the same time, in the existing air distribution method of the burner, the ratio method of oxygen in the primary air and the secondary air is not involved

In addition, due to the insufficient combustion caused by the existing air distribution method of the burner, the CO concentration in the oxygen-enriched combustion furnace increases, the reducing atmosphere on the wall surface increases, and it is easy to cause slagging and high-temperature corrosion of the water wall

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