Numerical Simulation and Optimization of SNCR System for CFB Boilers

doi:10.11930/j.issn.1004-9649.2013.9.1.4

Abstract

Abstract: With the regulation on NO_x emission for power plants becoming more and more stringent, the DeNO_x devices have to be installed even for the low NO_x emission CFB boilers. NO_x emission of boilers can be effectively decreased by injecting the reductant, such as ammonia or urea, into the inlet of CFB cyclones to realize the SNCR at high temperature. In this paper, the flow field of the cyclone and attached flue of a 185-t/h CFB boiler is simulated by ANSYS Fluent^�� software and a SNCR DeNO_x system is designed accordingly. The simulation results show that it is preferable to install more nozzles at the inner side of the cyclone inlet to improve the uniformity of the distribution of reductant. Also, increasing the average atomized particle size and spray cone angle is helpful to enlarge the spray range of reductant, but the effect of the spray speed on the spray range is limited

Key words: SNCR, spray parameter, flow field simulation, CFB

CLC Number:

TK227.1

LI Jing-ji, YANG Hai-rui, LI Qiong, YANG Jian-hua, LU Jun-fu. Numerical Simulation and Optimization of SNCR System for CFB Boilers[J]. Electric Power, 2013, 46(9): 1-5.

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