Application of T-S fuzzy modeling method in the bed temperature control of circulating fluidized bed boiler

2012 ◽  
Author(s):  
Qing-Qing Yan ◽  
Chao-Ying Liu ◽  
Xue-Ling Song ◽  
Zhe-Ying Song ◽  
Teng-Fei Li
Keyword(s):  
Fluidized Bed ◽  
Temperature Control ◽  
Circulating Fluidized Bed ◽  
Fuzzy Modeling ◽  
Modeling Method ◽  
Circulating Fluidized Bed Boiler ◽  
Bed Temperature

Analysis on the Bed Temperature Characteristics of 450t/h Circulating Fluidized Bed Boiler

2005 ◽  
Author(s):  
Jian-Qiang Gao ◽  
Chao-Bo Du ◽  
Yin-Song Wang
Keyword(s):  
Control System ◽  
Fluidized Bed ◽  
Temperature Control ◽  
Circulating Fluidized Bed ◽  
Supply Rate ◽  
Safe Operation ◽  
Fuel Supply ◽  
Bed Temperature ◽  
Dense Zone ◽  
Main Factors

Normal and steady bed temperature provides a basis for the stabilization and safe operation of the circulating fluidized bed boiler (CFBB) unit. Because the bed temperature is affected by many operating factors, it often fluctuates unexpectedly. The bed temperature auto-control system seldom could be put into service during the operation of large capacity CFBB unit. On the basis of operation data of a commercial 450t/h CFBB, which is the first biggest CFBB made in China, the authors systematically analyze the main factors which influence the changes of bed temperature, such as fuel supply rate, air supply rate, oxygen concentration, dense zone height and the unit load et al. The record of the operation data show that the lag of the bed temperature is common phenomenon while fuel supply is changed, and the lag time varies with the fuel supply time, fuel supply operating mode and fuel supply rate; Coal quality and its grain diameter spectrum also have notable influence on bed temperature; Primary air rate has different influences on bed temperature at different operating conditions, and its adjustment range on bed temperature is limited while it is used to bed temperature control; The change of oxygen concentration can reflect combustion conditions in the furnace; The change of dense zone height will result in the change of bed temperature, so the adjustment of fluidization air rate is necessary; Bed temperature is one of the main factors which lead to the change of boiler load. At last, regulating rules on bed temperature control are analyzed and summarized. The conclusions can provide references for the design of control system and safe operation of CFBB unit.

Lignite-Fired CFB Boiler SO2, NO Emission Control Technology Research

2014 ◽  
Vol 989-994 ◽  
pp. 256-259
Author(s):  
Jian Meng Yang ◽  
Bi Zheng Wang ◽  
Wei Wang
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Emission Control ◽  
Emission Characteristics ◽  
Control Technology ◽  
Technology Research ◽  
Circulating Fluidized Bed Boiler ◽  
No Emission ◽  
Cfb Boiler ◽  
Bed Temperature

For study on SO2 and NO emission characteristics of circulating fluidized bed boiler experiments were carried out in a 300MW circulating fluidized bed boiler. In these experiments, the variables were the amount of limestone and bed temperature. While conducting the test, the reasons for the changes in emission were analyzed, and some advices about combustion adjustment were proposed.

Experimental Study on Technical Difficulties of Botswana First Circulating Fluidized Bed Boiler during Loading Process

2013 ◽  
Vol 721 ◽  
pp. 357-362
Author(s):  
Guang Zeng ◽  
Sen Lin Zhao ◽  
Lai Wei ◽  
Run Ze Huang ◽  
Modiri Badirwang
Keyword(s):  
Fluidized Bed ◽  
Influencing Factors ◽  
Circulating Fluidized Bed ◽  
Stable Operation ◽  
Circulating Fluidized Bed Boiler ◽  
Cfb Boiler ◽  
Full Load ◽  
Loading Process ◽  
Bed Temperature ◽  
Boiler Operation

For study of technical difficulties that make Botswana first CFB (Circulating Fluidized Bed) boiler can’t reach full load at beginning of loading process, first experiments were carried out as awful experimental cases to analyze influencing factors; Second experiments were carried out as tentative experimental cases to select useful solutions; Third experiments were carried out as targeted experimental cases to execute chose solutions. Results indicate that one prominent difficulty during CFB boiler reaching full load is that boiler operation bed temperature was too high which was a comprehensive effect with some other influencing factors. CFB boiler bed temperature MFT (Main Fuel Trip) set point slight increasing, grain size changing of both start-up material and feeding coal, limestone injecting, fluidizing air of seal pot and FBHE appropriate controlling and FBHE (Fluid Bed Heat Exchanger) gradually start working are taken simultaneously, all these effective solutions solve the technical difficulties and accelerate the boiler reach full load, but attentions still need to be paid for the boiler stable operation permanently in future.

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