The invention discloses a wall-arranged direct-flow pulverized
coal combustion device with side secondary air, relates to a direct-flow pulverized
coal combustion device and aims to solve the problem that the four corners of a direct-flow
combustor with side secondary air are difficult to arrange tangentially and the problems of flag formation and
high temperature corrosion caused by the deflection of pulverized
coal airflow due to different air replenishing conditions on both sides of pulverized coal
airflow. Primary and secondary air nozzles arranged on four water-cooled walls of a
hearth are combined with a side secondary air
nozzle to form a
combustor; an included angle between the
central line of the primary air
nozzle and the water-cooled wall on which the primary air
nozzle is positioned in a fire side facing direction is alpha 2; an included angle between the
central line of the secondary air nozzle and the water-cooled wall on which the secondary air nozzle is positioned in the fire side facing direction is alpha 1; an included angle between the
central line of the side secondary air nozzle and the primary air nozzle is alpha 3; and over fire air nozzles are arranged on the water-cooled walls or corners of the
hearth and arranged above the
combustor. The mixing of pulverized coal and the air is reasonably organized to realize air-covered pulverized coal
combustion, prevent the pulverized coal
airflow from being deflected and contribute to stable combustion,
low load and low
NOx emission of a boiler. The device is used on a coal-fired boiler.