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Received December 5, 2010
Accepted April 11, 2011
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Principles of optimization of combustion by radiant energy signal and its application in a 660MWe down- and coal-fired boiler
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan District, Wuhan, Hubei 430074, P. R. China 1Huaneng Hanfeng Power Plant, Yijing Town, Fengfeng Mine Zone, Handan, Hebei 056200, P. R. China
hczhou@mail.hust.edu.cn
Korean Journal of Chemical Engineering, December 2011, 28(12), 2336-2343(8), 10.1007/s11814-011-0098-1
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Abstract
For the optimization of combustion in utility coal-fired boilers, a simple analytic model was set up to relate the radiant energy signal (RES) with the combustion rate (heat release rate) based on the heat transfer equation inside a boiler furnace. It was pointed out that as the air flow rate into the furnace changes, the highest RES corresponds to the highest efficiency, making RES a sensitive quantity for optimization of combustion in boilers. Experiments carried out in a 660 MW down- and coal-fired utility boiler confirmed the characteristics of RES as an indicator of combustion rate inside the furnace and its ability to reflect the boiler thermal efficiency varied with the air flow rate. The utilization of RES in the optimization of combustion can generally improve the boiler thermal efficiency at different unit loads, and the efficiency was raised about 1.0% especially at the rated and lower unit loads. It should be stated that except the lower unit load, the NOx emission from the boiler after optimization of combustion by RES would increase due_x000D_
to the limitation in supply of adequate air flow rate into the boiler, and some new combustion technologies are now available to solve the contradiction.
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