Half-W-shaped flame burning supercritical power station boiler

Abstract

The invention discloses a half-W-shaped flame burning supercritical power station boiler, and relates to a power station boiler which is used in a thermal power station, burns anthracites or low volatile lean coals, has a supercritical steam condition. The half-W-shaped flame burning supercritical power station boiler comprises a lower hearth with a front arch and a rear arch, the front arch and the rear arch of the lower hearth are respectively provided with two rows of weak vortex burners, and the slightly lower parts of a front wall and a rear wall of the lower hearth are respectively provided with one line of dual register burners. One layer or two layers of separated secondary air nozzles are arranged at the parts of front wall and rear wall of the upper hearth, which are away from the bottom of a platen superheater by 8m-12m. Each row of burners is arranged uniformly along the furnace width. According to the half-W-shaped flame burning supercritical power station boiler, the furnace side thermal deviation of the lower hearth water-wall tube is reduced significantly, the water circulation reliability is improved significantly, the Nox generation amount is decreased significantly, and the half-W-shaped flame burning supercritical power station boiler can adopt a less-oil or oil-free pulverized coal ignition technology easily, can be easily in large scale and can be used for designing and manufacturing the supercritical power station boiler which is in 1000MW level and burns anthracites or low volatile lean coals.

Description

(1) Technical field:

[0001] The invention relates to a semi-"W" flame-combustion supercritical power station boiler, which relates to a new boiler type of a power station boiler with supercritical steam parameters that burns anthracite or low-volatility lean coal and has supercritical steam parameters. (two) background technology:

[0002] The typical furnace type of anthracite or low volatile lean coal used in thermal power plants in the prior art is a "W" flame combustion boiler with subcritical steam parameters or supercritical steam parameters; "W" flame combustion boilers with supercritical steam parameters The lower furnace water wall of the W" flame combustion boiler uses low mass flow rate technology without exception, and the excessive thermal deviation of the lower furnace water wall along the furnace width will lead to the loss of positive flow self-compensation characteristics, endangering the operation of the lower furnace water wall Safety.

[0003] The burner...

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