Semi-W flame combustion subcritical steam pocket furnace

Abstract

The invention discloses a semi-W flame combustion subcritical steam pocket furnace, and relates to a low-nitrogen transformation method of a utility boiler which combusts anthracite or low-volatile-matter meager coal and has the W flame combustion method with the subcritical steam parameter. The semi-W flame combustion subcritical steam pocket furnace comprises a lower hearth with a front arch and a rear arch. The front arch of the hearth and the rear arch of the hearth are respectively provided with a line of weak vortex burners. The lower middle portion of a front wall of the lower hearth and the lower middle portion of a rear wall of the lower hearth are respectively provided with two lines of dual register burners. The portion, 8 m to 12 m away from the bottom of a screen type superheater, of a front wall of an upper hearth and the portion, 8 m to 12 m away from the bottom of the screen type superheater, of a rear wall of the upper hearth are respectively provided with one or two layers of separated secondary air nozzles. In each line, the burners are evenly distributed in the width direction of the furnace. On the lowermost layer, the dual register burners are start-up burners. All dual-inlet and dual-outlet steel ball grinding outlets are matched with dynamic and static separators. By means of the semi-W flame combustion subcritical steam pocket furnace, the thermal deviation of the furnace side of a lower hearth water-cooled wall pipe is obviously reduced, and water circulation reliability is obviously improved; the NOx production volume is obvious lowered; the less-oil or oil-free coal powder ignition technology is easily adopted.

Description

(1) Technical field: [0001] The invention relates to a semi-"W" flame-combustion subcritical steam drum boiler, which relates to a method for low-nitrogen reformation of a power station boiler with a "W" flame combustion mode with subcritical steam parameters, which burns anthracite or low-volatility lean coal. (two) background technology: [0002] The typical furnace type of anthracite or low-volatility lean coal used in thermal power plants in the prior art is a "W" flame combustion boiler, which has subcritical steam parameters or supercritical steam parameters; the subcritical steam parameters in service in my country There are far more "W" flame-fired boilers with supercritical steam parameters in service than "W" flame-fired boilers with supercritical steam parameters in service, and "W" flame-fired boilers with subcritical steam parameters in service are generally plagued by high NOx emissions. [0003] The burners of the "W" flame combustion boiler are all arranged on...

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Problems solved by technology

[0006] There are also successful cases of using anthracite coal or low-volatile lean coal power plant boilers in thermal power plants in the prior art, with front and rear wall hedging and four-corner tangential combustion methods, but the low-load stable combustion performance is poor

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