Heat flux distribution on circulating fluidized bed boiler water wall

Abstract

The future of circulating fluidized bed (CFB) combustion technology is in raising the steam parameters to supercritical levels. Understanding the heat flux distribution on the water wall is one of the most important issues in the design and operation of supercritical pressure CFB boilers. In the present paper, the finite element analysis (FEA) method is adopted to predict the heat transfer coefficient as well as the heat flux of the membrane wall and the results are validated by direct measurement of the temperature around the tube. Studies on the horizontal heat flux distribution were conducted in three CFB boilers with different furnace size, tube dimension and water temperature. The results are useful in supercritical pressure CFB boiler design.

References

1. Xin Jian Lu Junfu Yue Guangxi et al.Discussion on developing supercritical pressurecirculating fluidized bed boilerJournalof Engineering for Thermal Energy and Power 2002 17439441 (in Chinese)
2. Skowyra R S Czarnecki T S Sun C Y et al.Design of a Supercritical sliding pressure circulatingbed boiler with vertical water wallsIn: Rubow L NProceedings of the 13thInternational Conference on Fluidized Bed CombustionOrlandoASME 1995 1725
3. Yu Long Lu Junfu Wang Zhiwei et al.The future investigation of circulating fluidizedbed combustion technologyJournal of Engineeringfor Thermal Energy and Power 2004 19(4)336341 (in Chinese)
4. Rajaram S Nextgeneration CFBCChemical Engineering Science 1995 5455655571. doi:10.1016/S0009‐2509(99)00288‐2
5. Basu P Halder P K A new concept for operationof a pulverized coal fired boiler using circulating fluidized bedfiringJournal of Engineering for Gas Turbinesand Power, Transactions of the ASME 1989 111626630
6. Lu Junfu Zhang Jiansheng Yue Guangxi et al.Heat transfer coefficient calculation method ofthe heater in the circulating fluidized bed furnaceHeat Transfer―Asia Research 2002 31(7)540550 (in Chinese). doi: 10.1002/htj.10056
7. Dutta Animesh Basu Prabir An experimental investigationinto the heat transfer on wing walls in a circulating fluidized bedboilerInternational Journal of Heat andMass Transfer 2002 45(18)44794491. doi:10.1016/S0017‐9310(02)00148‐5
8. Andersson B A Leckner B Experimental methods of estimatingheat transfer in fluidized bed boilersInternationalJournal of Heat Mass Transfer 1992 35(12)33533362. doi:10.1016/0017‐9310(92)90222‐E
9. Bowen B D Fourier M Grace J R Heat transfer in membrane waterwallsInternational Journal of Heat Mass Transfer 1991 34(4,5)10431057. doi:10.1016/0017‐9310(91)90015‐7
10. Fang Z Xie D Dial N et al.A new method for solving the inverse conductionproblem in steady heat flux measurementInternational Journal of Heat Mass Transfer 1997 40(16)39473953. doi:10.1016/S0017‐9310(97)00046‐X
11. Zhang Jifeng Yue Guangxi Fang Zhaohong Numerical study on water wall temperature and heat fluxin circulating fluidized bed boilersBoilerTechnology 1998 1215
12. Cheng Leming Shi Zhenglun Luo Zhongyang et al.Temperature distributions in a finned water walltube of a circulating fluidized bed boilerJournal of Power Engineering 2002 22(2)16741680 (in Chinese)
13. Fang Z H Grace J R Jim C J Local particle convective heat transfer along surfacesin circulating fluidized bedsInternationalJournal of Heat Mass Transfer 1995 38(5)12171224. doi:10.1016/0017‐9310(94)00243‐O
14. Cheng Leming Wang Qinhui Shi Zhenglun et al.Heat transfer in a large circulating fluidized bedboilerJournal of Power Engineering 2006 26(3)305310
15. Myöhänen Kari Hyppänen Timo Miettinen Jouni et al.Three-dimensional modeling and model validationof circulating fluidized bed combustionIn: Pisupat S V Proceedings of 17th International Conference on Fluidized Bed CombustionFlorida ASME 2003 48
16. Yang Hairui Lu Junfu Liu Qing et al.Lateral solids mixing in the dense bed of CFB boilerChinese Journal of Chemical Engineering 2002 10(4)490493
17. Zhang Hai Lu Junfu Yang Hairui et al.Heat Transfer measurements inside the furnace ofa 135 MWe CFB boilerIn: Cen K e f aProceeding of the 8th Circulating Fluidized Bed Technology,Hangzhou: International Academic Publishers World Publishing Corporation 2005 254260
18. Wang Yu Lu Junfu Yang Hairui et al.Measurement of Heat transfer in a 465t/h CirculatingFluidized Bed BoilerIn: Jia L u f e iProceeding of the 18th International Conference onFBCTorontoASME 2005 327335