Coal dust thickness-thinness separating and distributing structure of single-fireball eight-corner direct-flow burner

Abstract

The invention discloses a coal dust thickness-thinness separating and distributing structure of a single-fireball eight-corner direct-flow burner. Eight groups of burners are arranged on a boiler body, two groups of the burners are arranged on each water cooled wall, each group of the burners comprises a plurality of the burners with nozzles facing to the same direction, and a center line of each nozzle of the eight groups of the burners forms an imaginary inscribed circle along the same tangential direction in a boiler chamber. In the coal dust thickness-thinness separating and distributing structure, the eight groups of the burners are distributed on four water cooled wall of a boiler, therefore, the coal dust concentration of a thick coal dust area is increased, the heat load qHr of the wall face of the area of the lower burners is higher, and the burning temperature in the area can achieve the requirement of stable-combustion of firing of anthracite. The distance of jet flow from outlets of the nozzles to a downstream adjacent-angle airflow is short, a lower primary air coal dust airflow speed can be adopted, the intensity of a heat flow of the outlets of the nozzles is high, and passing convection and radiation heat transfer amount are improved to ensure timely firing of the airflow of anthracite coal dust and steady burning of the boiler in low load without oil.

Description

technical field [0001] The invention relates to a technology belonging to a pulverized coal combustion device, in particular to a coal pulverized density separation arrangement structure of a single fireball octagonal direct-flow burner burning anthracite. Background technique [0002] China's proven coal reserves are about 640 billion tons, of which low-volatile anthracite accounts for about 14.6% of the total coal reserves. my country's thermal power plants use anthracite coal for about 3% of the total coal used for power generation, and this figure is still increasing. Anthracite has low volatile content, low hydrogen content, high ignition temperature, and slow flame propagation speed. If the combustion organization is not good, it is prone to unstable low-load combustion, and when the coal quality deteriorates, the boiler is prone to flameout under high load. Combustion efficiency is also generally lower. [0003] At present, W-flame boilers, four-corner tangential co...

AI Technical Summary

Problems solved by technology

It can be seen that since each group of burners 8 is arranged at intervals along the vertical direction with 12 primary air pulverized coal nozzles 5, the heat load q on the wall surface of the burner area in this arrangement Hr Low, can not meet the requirements of anthracite combustion

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