A swing type one-way wall-attached secondary air device for pulverized coal boiler and pulverized coal boiler

Abstract

The invention provides an oscillating one-way wall-attached secondary air device of a pulverized coal fired boiler and the pulverized coal fired boiler. The bottom end of a wall-attached secondary air nozzle is hinged to one end of a secondary air mother pipe; one end of a connecting rod mechanism is hinged to the side wall of the wall-attached secondary air nozzle, and the other end of the connecting rod mechanism is hinged to one end of a lead screw; a lead screw nut in fit connection with the lead screw is mounted in a mounting hole formed in a closed end of a shell; the lead screw nut is fixedly mounted in the mounting hole or rotationally connected with the mounting hole; a hand wheel is arranged outside the shell, and is fixedly connected with the other end of the lead screw or the lead screw nut; and the hand wheel rotates the lead screw or the lead screw nut to extend or shrink the lead screw so as to drive the connecting rod mechanism to adjust the angle of the wall-attached secondary air nozzle. The device and the pulverized coal fired boiler can adjust the angle of the wall-attached secondary air nozzle, adopt the lead screw nut structure to realize the displacement input, and are large in transmission ratio and high in output displacement precision, so that the wall-attached secondary air nozzle can work in any position in a preset angle range.

Description

Technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a swing type unidirectional wall-attached secondary air device of a pulverized coal boiler and a pulverized coal boiler. Background technique [0002] The pulverized coal boiler with secondary air attached to the wall reduces the reduction of NO substances HCN and NH from the bottom to the top of the furnace i , CO, etc., so that the secondary air enters the "near wall area" where the coke accumulates in a timely manner, thereby increasing the coke burnout rate and the NO reduction rate in the area along the furnace from the bottom up, so that less coke enters the burnout zone. The overfire air can be arranged at a higher position in the furnace. The combination of the secondary air with the wall and the rising flue gas flow in the central area also expands the surface area of ​​the water wall with the characteristics of low temperature, high oxygen and low solid concentrati...

AI Technical Summary

Problems solved by technology

At present, the wall-attached secondary air devices of most pulverized coal boilers are fixed structures, and the angle of the wall-attached secondary air nozzle cannot be adjusted, and the blowing direction of the secondary air cannot be adjusted according to different working conditions, which reduces the use effect of the boiler.

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