Combustion device with centralized arrangement of upper and lower thick and thin primary air

Abstract

The invention provides an up-and-down thick-and-thin primary air concentrated distribution type combustion device and relates to a pulverized coal combustion device. The invention aims to solve the problem the NOx discharge concentration of the conventional high primary air rate pulverized coal boiler is difficult to control. A primary air nozzle is provided with at least three layers from top to bottom and is positioned between two layers of fuel oil auxiliary secondary air nozzles; a bottoming secondary air nozzle is arranged below the lower layer of fuel oil auxiliary secondary air nozzle; a compact burnout air nozzle is arranged above the upper layer of fuel oil auxiliary secondary air nozzle; a lower separated burnout air nozzle and an upper separated burnout air nozzle are arranged above the compact burnout air nozzle sequentially; a blunt body is horizontally arranged in the middle of each layer of primary air nozzle; the nozzle on the upper part of the blunt body is a thick pulverized coal primary air nozzle; the nozzle on the lower part of the blunt body is a thin pulverized coal primary air nozzle; a pair of stable combustion teeth are arranged in the thick pulverized coal primary air nozzle; surrounding air is arranged at the periphery of the primary air nozzle. The up-and-down thick-and-thin primary air concentrated distribution type combustion device is applied to high-efficient and low-pollution combustion of the high primary air rate pulverized coal boiler.

Description

technical field [0001] The invention belongs to the tangential combustion technology of pulverized coal furnaces, and in particular relates to a combustion device with centralized arrangement of upper and lower thick and thin primary air. Background technique [0002] The tangential combustion technology of pulverized coal furnace generally refers to the way that the pulverized coal airflow is introduced into the furnace for combustion from the straight-through burners arranged at the 4 corners (or 6 corners, 8 corners) of the furnace. The air-powder mixture from each corner works together to form a strong swirling fireball in the furnace. Generally, the primary and secondary air outlets are often arranged at intervals, and the geometric centerlines of each air outlet are respectively tangent to one or several imaginary circles in the center. [0003] In this kind of boilers, some boilers have insufficient drying capacity due to high moisture content and low calorific value...

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