Study on Pipeline Characteristics and Selection of Primary and Secondary Air Fans for CFB Boilers

doi:10.11930/j.issn.1004-9649.2012.10.36.5

Abstract

Abstract: Through analyzing the pipeline characteristics of the primary air and secondary air on circulating fluidized bed （CFB） along with several operating data from commercial CFB boilers, the selection principles of primary air fan and secondary air fan are studied. The results indicate that the maximum air flow and maximum pressure head of the primary air of a CFB boiler are not at the same operating point, forming a pipeline characteristic completely different from that of a pulverized coal boiler. The pipeline characteristic of the secondary air of a CFB boiler is similar to that of a pulverized coal boiler, but with the pressure drop produced by the particle concentration in the furnace added to the system resistance. When a primary air fan is selected for CFB boilers, the pipeline characteristic curve should be entirely included by the fan performance curve, and inlet guide vane adjustment or variable speed adjustment of lower energy consumption should be adopted. The selection principle of the secondary air fan for the CFB boiler is similar to that of the centrifugal fan with the pressure drop caused by bed materials beingestimated. For 300-MW CFB units, the pressure drop is usually between 5.5 kPa and 7.5 kPa.

Key words: thermal power plant, circulating fluidized bed, pipeline characteristic, selection principle

CLC Number:

TK229.6

WANG Quan-hai, LU Xiao-feng, LU Jia-yi, ZHANG Wen-qing, XIN Sheng-wei, LIU Chang-xv, LI Lin. Study on Pipeline Characteristics and Selection of Primary and Secondary Air Fans for CFB Boilers[J]. Electric Power, 2012, 45(10): 36-41.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2012.10.36.5

https://www.electricpower.com.cn/EN/Y2012/V45/I10/36

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