Low NOX dry ash extraction coal powder burning method

Abstract

The invention relates to a low NOX solid residue discharge coal dust combustion method which is characterized in that a fire grate at the bottom of an old boiler is dismounted, so that a pure hearth is formed, or a boiler provided with the pure hearth is manufactured; at least one inflamer is arranged at the bottom or one side of the pure hearth; when a primary air fan is started, primary air and coal dust enter the inflamer through a primary air/coal dust pipe, so that the primary air and the coal dust can burn sufficiently after entering a combustion chamber; meanwhile, a flame detector automatically enters a crust block prevention tertiary air curtain regulating valve which can monitor and has the function of linkage protection and regulation and a secondary air regulating valve, an air curtain is formed on the inner wall of a high temperature fire resistant layer by the wind sprayed out of a crust block prevention tertiary air curtain spray pipe, the secondary air enters the combustion chamber through a secondary air rotational flow guider and a secondary air flame stabilizing rotational flow guider, the rotational flow direction of the secondary air is consistent with that of an axial flow generator, and the secondary air is mixed with the coal dust burnt by the primary air again to be burnt, thus leading the coal dust to be burnt more fully. The invention has the advantage of burning the coals with low ash fusion point and high ash fusion point.

Description

technical field [0001] The present invention relates to a low NO X Solid state slagging pulverized coal combustion method, suitable for 2-35 tons of steam, hot water boilers, kilns, forging, steelmaking, road and bridge mixing stations and cold aggregate heating, power plant boiler ignition and other industries that require combustion for heat energy production The device belongs to the technical field of pulverized coal burners. Background technique [0002] Chain boiler is a furnace type widely used in industrial boilers at present, such as figure 1 As shown, it includes boiler furnace C and chain grate B. Fuel coal A enters the boiler and burns in layers on chain grate B. The combustion flue gas is discharged from outlet D of boiler furnace C. The disadvantage of this boiler is that it burns Insufficient mixing with air, resulting in incomplete combustion, low burn rate, q 4 Large loss, exhaust smoke contains NOx, SO 2 , High dust concentration, and pollute the enviro...

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Problems solved by technology

[0002] Chain boiler is a furnace type widely used in industrial boilers at present, such as figure 1 As shown, it includes boiler furnace C and chain grate B. Fuel coal A enters the boiler and burns in layers on chain grate B. The combustion flue gas is discharged from outlet D of boiler furnace C. The disadvantage of this boiler is that it burns Insufficient mixing with air, resulting in incomplete combustion, low burn rate, q 4 Large loss, exhaust smoke contains NOx, SO 2 , high dust concentration, and pollute the environment. In order to solve these problems, people have improved the structure of industrial boilers, but they have not changed the traditional combustion method, and the effect is not ideal.

[0003] The applicant applied on July 28, 2008 for a utility model patent titled "Low NOx Liquid Slagging Double Swirling Pulverized Coal Burner", the application number is "200820151316.0"; the title is "A Combustion Method for Industrial Boilers" Patent for invention, application number is "200810041070.6", the secondary air chamber of the burner is set outside the combustion chamber shell, and a swirl duct is arranged in the secondary air chamber, the primary air is axially introduced, and the secondary air is Tangentially introduced, the combustion temperature can reach 1450°C-1600°C, so the liquid slag is discharged after combustion, and its disadvantage is that it can only burn coal with a low ash melting point

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