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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

APPLICATION AND RESEARCH OF THE AUTOMATIC ADJUSTABLE PULVERIZED COAL DISTRIBUTOR

Wei Dong Bai
The State Engineering Technology Research Center of Combustion of Power Plant

Yong Yun
The State Engineering Technology Research Center of Combustion of Power Plant

Zhen Dong Shu
The State Engineering Technology Research Center of Combustion of Power Plant

Qing Guang Zheng
The State Engineering Technology Research Center of Combustion of Power Plant

Abstract

With the increasing tasks of load down operation of the power station units in China, the capacity of the boiler's low-load stable burning is more necessary. This paper proposes a new type automatic adjustable pulverized coal distributor (AAPCD) and mainly introduces the stable burning principle of this distributor and it's application in the direct-fired system in boilers with fan mills. The dependence of the characters of the automatic adjustable pulverized coal distributor on the air and coal powder flows by means of a lot of commercial tests. The results show: being applied in domestic lignite boiler of 670 t/h, this AAPCD can adjust the distribution of the air and coal powder when the boiler is running; achieve effective control of distribution of them, increasing the capacity of the boiler's low-load stable burning without oil which usually used in China while the boiler works in a low-load condition from 70% down to 45%, so we can lower the load greatly. Because the combustion of the fuel is divided into two parts-over dense combustion and over sparse combustion in boiler, the emission of NOx is less than 350ppm, the unburned carbon loss is decreased by 1.958%, So it effectively increases the thermal efficiency and improves the capacity of low-load operation.