Device and method for w shape flame boiler completely burning

Abstract

The invention provides a W type fire boiler burned wind device and its method; it belongs to W type fire boiler combustion technology. A burned wind discharging aperture is arranged on the wind coal powder aperture neck position, 5-10% of total wind quantity are blown into the upper place of the furnace with angle of 10-45 degree, the wind velocity is 30-60m / s, the wind temperature is the same to the secondary wind temperature. In the post period, the coal powder is disturbed in the furnace, strengthens the dispersing of oxygen to the particle surface and supply oxygen, upgrades the combustion velocity of coal powder particle, increases the burn rate, upgrades the combustion efficiency of W type fire boiler; at the same time, because the wind quantity is decreased in the combustion area and the temperature is decreased in the burned area, then the discharge quantity of NOX can be decreased.

Description

technical field [0001] The invention belongs to the combustion technology of a W-shaped flame boiler, and in particular relates to a W-shaped flame boiler burnout air device and method. Background technique [0002] The W-type flame boiler is the main type of furnace that burns low-volatile lean coal and anthracite. The flammable pulverized coal gas flow is gradually added to the fire, so as to achieve graded air supply, which is in line with the characteristics of low-volatile lean coal and anthracite combustion delay; the flame stroke is long, which can prolong the residence time of pulverized coal particles in the furnace; the lower furnace is arranged around the furnace. The water-cooled wall makes the combustion temperature of the lower furnace higher. These characteristics are conducive to the ignition, stable combustion and burnout of low-volatile lean and anthracite coals. [0003] The operating conditions show that the W-type flame boiler basically solves the stab...

AI Technical Summary

Problems solved by technology

However, the following main problems still exist: the combustion effect is generally poor, and the combustible matter of fly ash reaches 8-20%, and some boilers even reach 40%; when the air volume is increased under high load, the combustion is unstable, and the boiler is forced to operate under low oxygen ( ≤2%) operation, resulting in reduced combustion efficiency (Bai Shaolin et al.

But so far, this overfire air technology has not been used in the combustion of W-type flame boilers

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