Rotational flow coal powder burner

Abstract

The invention discloses a swirling pulverized coal burner, which comprises a front concentration separation ring, a central guide tube with a central concentration separation ring at the front end, a support plate, an outer guide tube and an igniter in a primary air bend and a primary air tube. The front concentration separation ring is placed at the elbow of the primary air duct, and the central guide tube is connected to the outer guide tube through the support plate; it is characterized in that the igniter is radially arranged in the central guide tube at the front end of the primary air duct in a retractable manner. A separation rod guide cylinder is also arranged in the axial direction at the elbow of the primary air duct, and a retractable concentration separation rod is also arranged at the front end of the separation rod guide cylinder and the central guide cylinder. The concentration separation rod can be retracted to the inside of the separation rod guide cylinder through the actuator. When the igniter is put into operation, the concentration separation rod will not affect the ignition of the dense phase pulverized coal by the flame. When the igniter is deactivated, the distribution of pulverized coal particles of the original burner is restored, which will affect the flow field and temperature in the burner. Field distribution, the effect of boiler performance is minimized. The low NOx, outer rich and inner thin combustion characteristics and methods of the original burner are retained.

Description

technical field [0001] The invention relates to a pulverized coal combustion device, in particular to a pulverized coal burner with swirling flow. It belongs to the field of pulverized coal combustion devices using plasma ignition or micro-oil ignition technology. It is used for ignition start-up and low-load stable combustion of pulverized coal boilers with front and rear walls facing each other. It can also be used as the main burner of pulverized coal boilers. The feature of separation of shades along the radial direction. Background technique [0002] At present, large boilers generally use fuel oil to ignite, and the operating cost is relatively high. The plasma pulverized coal ignition technology and micro-oil ignition technology are safe and practical technologies to solve the fuel consumption problem of pulverized coal boilers in thermal power plants. This kind of burner that uses plasma arc to ignite pulverized coal is generally inserted axially with a plasma gene...

AI Technical Summary

Problems solved by technology

This kind of burner generally has a large change to the original burner, so that the flow field, temperature distribution inside the burner, and the combustion area at the nozzle are all changed, and the coal powder in the dense phase is distributed along the centerline of the burner, so that It not only affects the performance of the burner, but also cannot restore the original state of separation of the concentration of pulverized coal; at the same time, it destroys the temperature distribution at the burner nozzle entering the furnace

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