Residence Time Distributions in Confined Swirling Flames
作者:
Lars Storm Pedersen,
Peter Breithauptb,
Kim DAM- Johansen,
Roman Weber,
期刊:
Combustion Science and Technology
(Taylor Available online 1997)
卷期:
Volume 127,
issue 1-6
页码: 251-273
ISSN:0010-2202
年代: 1997
DOI:10.1080/00102209708935696
出版商: Taylor & Francis Group
关键词: Residence time distribution;confined swirling flames;coal combustion;mathematical modelling
数据来源: Taylor
摘要:
The objective of this work was two-fold: to determine the residence time distribution (RTD) in swirling pulverised coal flames and 10 develop a simple configuration of ideal chemical reactors, able to simulate the RTD. The work was performed using the solution of a mathematical model for a 2.2 MWthand a 12 MWthpulverised coal flame. Both flames are type II, resulting in high NOxemissions. From the mathematical solution the RTD was simulated by tracing a number of fluid particles or inert particles. The simulations showed that about 30% (dependent of the flame) of the fluid had a significantly lower residence time compared to the mean residence time. Based on RTD simulations and particle trajectories a simple configuration of ideal chemical reactors, able to simulate the main flow of the gas phase in the furnaces, was developed. The configuration consists of a plug flow reactor representing the jet centre, a well-stirred reactors representing the external recirculation zone, and a combination of well-stirred reactors representing the down stream region of the furnaces. The parameters in the ideal chemical reactor model were shown to berelated to distinct zones in the furnaces. Finally, the ideal chemical reactor model was verified against experimental RTD data of a 2.5 MWthconfined swirling natural gas flame.
点击下载:
PDF (657KB)
返 回