Controversies still exist over the necessity of equipping with an emergency water supply system in the supercritical circulating fluidized bed/CFB unit. To resolve the dispute, research on the safety of the heating surfaces in the supercritical CFB boiler during the electricity failure accident under the assumption of not putting the emergency water supply system into use must be conducted. However, due to the low incidence rate of this accident, no relevant data have been reported yet. To provide useful data for the related research, a breakdown accident of the main feed water pump that happened in a 350 MW supercritical CFB boiler was introduced in this work. The analysis of the physical processes in both the furnace and water side of the boiler during this accident was performed. Then the discussion on the similarities and discrepancies between the two accidents was carried out. It was found out that with appropriate handling, the data collected in two periods of the breakdown accident of the main feed water pump can provide a reference for the verification of the prediction model of the electricity failure accident. Finally, a preliminary prediction model was established as the first step of the verification work.
DENG Boyu, ZHANG Man, WEI Guohua, LYU Junfu, YANG Hairui
. Analysis and Referential Significance of a Breakdown Accident of the Main Feed Water Pump in a 350 MW Supercritical CFB Boiler[J]. Journal of Thermal Science, 2023
, 32(5)
: 1797
-1806
.
DOI: 10.1007/s11630-023-1799-6
[1] Yue G.X., Lu J.F., Xu P., et al., The up-to-date development and future of circulating fluidized bed combustion technology. Electric Power, 2016, 49(01): 1–13.
[2] Arjunwadkar A., Basu P., Acharya B., A review of some operation and maintenance issues of CFBC boilers. Applied Thermal Engineering, 2016, 102: 672–694.
[3] Yue G.X., Cai R.X., Lu J.F., et al., From a CFB reactor to a CFB boiler - the review of R&D progress of CFB coal combustion technology in China. Powder Technology, 2017, 316: 18–28.
[4] Zhang M., Cai R.X., Jiang X.G., et al., Design and development of a 660 MW high efficiency ultra-supercritical double-furnace CFB boiler. Journal of Chinese Society of Power Engineering, 2018, 38(05): 341–346.
[5] Cai R.X., Zhang H., Zhang M., et al., Development and application of the design principle of fluidization state specification in CFB coal combustion. Fuel Processing Technology, 2018, 174: 41–52.
[6] Ke X.W., Cai R.X., Zhang M., et al., Application of ultra-low NOx emission control for CFB boilers based on theoretical analysis and industrial practices. Fuel Processing Technology, 2018, 181: 252–258.
[7] Lyu J.F., Yang H.R., Ling W., et al., Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler. Frontiers in Energy, 2019, 13(1): 114–119.
[8] Wang W.L., Li Z., Lyu J.F., et al., An overview of the development history and technical progress of China’s coal-fired power industry. Frontiers in Energy, 2019, 13(3): 417–426.
[9] Deng B.Y., Zhang M., Lyu J.F., et al., Safety analysis on the water wall in the 350 MW supercritical CFB boiler under sudden electricity failure. Energy, 2019, 189: 116364.
[10] Yao Y.G., Jiang L., Deng B.Y., et al., Heat transfer analysis of stationary bed materials in a CFB boiler after a sudden power failure. Fuel Processing Technology, 2021, 211: 106587.
[11] Go G., Moon U.C., A water-wall model of supercritical once-through boilers using lumped parameter method. Journal of Electrical Engineering & Technology, 2014, 9(6): 1900–1908.
[12] Wang D.F., Xiao K., Theoretical analysis and calculation of the unsteady heat transfer process of supercritical circulating fluidized bed boiler furnace under the emergency conditions. Boiler Technology, 2015, 46(05): 35–38.
[13] Zima W., Nowak-Oclon M., Oclon P., Simulation of fluid heating in combustion chamber waterwalls of boilers for supercritical steam parameters. Energy, 2015, 92(1): 117–127.
[14] Li G., Zhou X., Zhou Q., et al., Study on the safety of water-wall after the BT of water supply interruption of supercritical CFB boiler. Dongfang Electric Review, 2016, 30(04: 43–46.
[15] Xie B.B., Yang D., Xie H.Y., et al., Numerical analysis of flow instability in the water wall of a supercritical CFB boiler with annular furnace. Journal of Thermal Science, 2016, 25(4): 372–379.
[16] Deng K.J., Yang C., Chen H., et al., Start-Up and dynamic processes simulation of supercritical once-through boiler. Applied Thermal Engineering, 2017, 115: 937–946.
[17] Taler J., Zima W., Oclon P., et al., Mathematical model of a supercritical power boiler for simulating rapid changes in boiler thermal loading. Energy, 2019, 175: 580– 592.
[18] Zima W., Simulation of rapid increase in the steam mass flow rate at a supercritical power boiler outlet. Energy, 2019, 173: 995–1005.
[19] Mokry S., Pioro I., Farah A., et al., Development of supercritical water heat-transfer correlation for vertical bare tubes. Nuclear Engineering and Design, 2011, 241(4): 1126–1136.
