Multichannel rotational flow flame stabilization stepless regulation multifuel combustion combustor

Abstract

The utility model relates to a multi-channel swirling flow stabilizing flame stepless adjustable mixed combustion burner, which relates to a burner, in particular to a mixed combustion burner using pulverized coal and gas as fuel or a single combustion burner of pulverized coal and gas. It is equipped with a conical ring flame stabilizer in the center of the burner shell, the small head of the flame stabilizer is connected to the central air pipe and the gas pipe, and the outer wall of the gas pipe is connected to a gas mixer. A volute swirler and an adjustment pull rod are arranged on the outer wall of the gas ring joint and the gas pipe at the other end. The outer layer of the gas pipe is equipped with a fire channel, a primary air channel, a secondary air channel and a clean air channel. The secondary air duct and the clean air duct are equipped with swirlers and conical air nozzles respectively. The outer wall of the outlet of the clean air inner pipe and the secondary air inner pipe is made with a cone angle of 15-20° that expands outwards, and the cross-sectional area of ​​the outlet can be changed arbitrarily in the axial direction, and the airflow velocity can be changed. The flame stabilizer can move axially to change the outlet angle of the central air. In this way, the heat load flame shape can be adjusted steplessly, and the combustion temperature can be organically combined with the process conditions. The invention is a pulverized coal and gas burning device with high efficiency, energy saving and low emission of NOx.

Description

technical field [0001] The invention relates to a burner, in particular to a burner which uses pulverized coal and gas as fuel for mixed combustion or pulverized coal and gas for single combustion. Background technique [0002] At present, the rotary kiln in the chemical building materials industry generally sends coal powder or gas, primary air, and secondary air into the kiln for combustion through the burner. During the combustion process, it is often found that the black fire head at the burner outlet is too long. This phenomenon is the result of pulverized coal combustion. The speed is slow, the combustion is not complete, and the nitrogen and oxygen molecules stay in the high temperature zone of the flame for a long time. Therefore, there are many opportunities to form NOx and the amount of formation is also large. Second, the pulverized coal and air are mixed in the coal injection pipe, and are injected into the kiln for combustion by the annular nozzle. Oxygen diffu...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high NOx and low thermal efficiency of the current burners using pulverized coal and gas as fuel, the present invention develops a multi-channel swirling flame stabilizing stepless adjustable mixed combustion burner

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