A stable flame low nitrogen solid fuel oxygen-enriched burner

Abstract

The invention discloses a steady-flame and low-nitrogen oxygen enrichment burner for solid fuel. A fuel and air mixed flow inlet of the burner is sequentially communicated with a fuel flow conveying pipe, a cyclone mixer and a fuel nozzle. An oxygen inlet is formed in a second oxygen guide pipe, a first oxygen guide pipe is sleeved with the second oxygen guide pipe, and an oxygen adjusting valve is arranged at an inlet of the first oxygen guide pipe. The fuel flow conveying pipe is sleeved with the first oxygen guide pipe. Oxygen coming from the oxygen inlet is divided into two oxygen flows through the oxygen adjusting valve, one oxygen flow enters the fuel nozzle through a first oxygen jet opening, and the other oxygen flow and fuel and air mixed flow together form a rotational flow in the fuel nozzle. The oxygen and the fuel and air mixed flow are mixed, so that a well-mixed oxygen enrichment fuel mixed flow is formed. The second oxygen flow in the second oxygen guide pipe is ejected from a second oxygen nozzle at a high speed, and the second oxygen flow ejected at the high speed forms a rotational flow field in a kiln. By means of the steady-flame and low-nitrogen oxygen enrichment burner, the torch coverage area can be increased, hot flow circulation in the kiln is promoted, and nitrogen oxide emission is lowered.

Description

technical field [0001] The invention relates to a burner, in particular to a flame-stable low-nitrogen solid fuel oxygen-enriched burner. Background technique [0002] The application of solid fuels in industrial kilns is currently a more common combustion method of "combustion-supporting air + fuel". Since the combustion-supporting agent in the air that can react with solid fuels, oxygen only accounts for 21% of the total gas volume, and nitrogen accounts for 10% of the total. 78% enter the kiln as unprofitable gas, and the NOx generated in the high temperature of the kiln flame will be discharged as waste gas, which will take away a lot of heat energy, and the treatment cost of a large amount of NOx is very high. Simultaneously, due to the low oxygen content in the air, solid fuels are difficult to fully burn out in a short period of time, and unburned substances are easy to appear in the heated products, which seriously affects the product quality. At present, although s...

AI Technical Summary

Problems solved by technology

[0004] 1. The combustion flame is unstable;

[0005] 2. The local temperature of the flame is too high, the temperature is uneven, and the formation of NOx cannot be well controlled;

[0006] 3. The torch is short and the coverage area is not enough

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