Multiple oil gun rounding arrangement micro-oil ignition coal power combusting device

Abstract

The invention discloses a pulverized coal burner with multiple oil guns tangentially arranged with micro-oil ignition. It includes a primary air passage, a pulverized coal concentrator and a pulverized coal combustion chamber which are connected in sequence and whose central axes coincide. At least three oil combustion chambers are symmetrically arranged on the pulverized coal concentrator, and a micro-oil gun is arranged at the inlet end of each oil combustion chamber, and the outlet end of each oil combustion chamber communicates with the pulverized coal concentrator; The included angle α between the central axis of the combustion chamber and the central axis of the primary air channel is 40°-60°. The angle β between the central axis of each oil combustion chamber and the normal line passing through this point is 6-12°, and the central axes of each oil combustion chamber are tangent to the same imaginary circle. The oil gun is arranged tangentially, and a rotating torch can be formed inside the pulverized coal combustion chamber. The torch can conduct strong turbulent flow and heat exchange with the pulverized coal airflow, rapidly heat the pulverized coal and burn it, and further heat it with the heat released by the combustion of part of the oil. Coke is burned when it reaches the ignition temperature, which shortens the preheating time before the fuel is ignited and improves the burnout rate of pulverized coal.

Description

technical field [0001] The invention relates to a pulverized coal burner, which belongs to a cold-state ignition and ultra-low-load stable combustion device for a pulverized coal boiler in a power station; in particular, it relates to a pulverized coal burner with multiple oil guns arranged in tangential circles and micro-oil ignition. Background technique [0002] my country is a big oil importing country. In May 2005, the National Development and Reform Commission launched the "Medium and Long-term Special Plan for Energy Conservation", which proposed the goal of saving and replacing 38 million tons of oil during the "Eleventh Five-Year Plan" period, and was listed as the top ten energy-saving projects. The conventional method for boiler start-up and low-load stable combustion in a thermal power station is to use a large oil gun to inject oil; taking a 300MW unit as an example, 50-100T of fuel oil needs to be input during the cold start-up of the boiler from ignition to pul...

AI Technical Summary

Problems solved by technology

Chinese patents ZL03255982.8, ZL200520145352.2 etc. have announced several different forms of micro-oil ignition burners, and these burners have their own advantages in realizing micro-oil ignition and low-load stable combustion; The method of arranging the oil gun on one side is adopted, so the heating of the pulverized coal is heated on one side; this results in a long heating time, requiring a longer size of the entire pulverized coal burner

Therefore, when the actual required length of the entire pulverized coal burner exceeds the upper limit, it will lead to a reduction in the burnout rate of pulverized coal at the outlet of the burner; this will greatly reduce the stability of ignition, and even lead to failure of normal ignition

Therefore, the above-mentioned existing burners only have good adaptability to bituminous coal and lignite with high volatile content, and their application is greatly restricted.

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