Impact of Coal Types and Pulverizing Methods on the Thermal Performance of Blending Coal-Fired Boilers and Their Operational Optimization

doi:10.11930/j.issn.1004-9649.2017.03.077.06

Abstract

Abstract: The long-term operation with off-designed coal types brings a power plant significant safe and economic problems on its boiler operation. Aiming at solving the problem, tests are conducted to understand the operational status of the units, to analyze the coal blending problem and to optimize the combustion schemes according to the adaptability of the boiler to different coal types. The test results show that the coal blending should not only simply depend on the calorific value or the volatile contents the unit adaptability to different coal types and the influence of coal type dissimilarity on combustion characteristics should also be considered. In the new coal blending scheme, the anthracite(V_daf=9.23%) of Pulverizer C in phaseⅠproject is swapped with the lean coal of Pulverizer A in phase Ⅱ project, which increases the average volatile contents and reduces the coal type dissimilarity for the phase I project. After the optimization, the vibration of the pulverizer gets better. The average boiler efficiency of the units gets a 0.62 percent improvement and the average coal consumption for power generation gets a 0.65 g/（kW·h） decrease.

Key words: type of unit, blending coal combustion, boiler efficiency, carbon content of fly ash, fineness of pulverized coal

CLC Number:

TM621

ZHOU Yonggang, WANG Huan, WANG Jing, LI Pei, ZHAO Hong. Impact of Coal Types and Pulverizing Methods on the Thermal Performance of Blending Coal-Fired Boilers and Their Operational Optimization[J]. Electric Power, 2017, 50(3): 77-82.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.03.077.06

https://www.electricpower.com.cn/EN/Y2017/V50/I3/77

References

[1] 钟德惠,丘纪华. 可磨性对混煤燃烧特性的影响[J]. 电站系统工程,2003,19（2）：13-14.
ZHONG Dehui, QIU Jihua. Impact of grinding behavior of blended coals on pulverized fuel combustion character [J]. Power System Engineering, 2003, 19(2): 13-14.
[2] 平传娟,周俊虎,程军,等. 混煤热解反应动力学特性研究[J].中国电机工程学报,2007,27（17）：6-10.
PING Chuanjuan, ZHOU Junhu, CHENG Jun, et al . Research on the pyrolysis kinetics of blended coals[J]. Proceedings of the CSEE, 2007, 27(17): 6-10.
[3] 刘亮,周臻,李录平,等. 混煤燃烧反应动力学参数的实验研究[J]. 电站系统工程,2006,22（2）：7-8,13.
LIU Liang, ZHOU Zhen, LI Luping, et al . Experimental study of kinetic parameters of combustion reaction of blended coals[J]. Power System Engineering, 2006, 22(2): 7-8, 13.
[4] 刘亮,李录平,柏湘杨,等. 混煤热解特性及燃烧过程的实验研究[J]. 动力工程,2006,26（1）：130-134.
LIU Liang, LI Luping, BAI Xiangyang, et al . Pyrolysis characteristics and combustion process of blended coal[J]. Journal of Power Engineering, 2006, 26(1): 130-134.
[5] 高正阳,方立军,周健,等. 混煤燃烧特性的热重试验研究[J].动力工程,2002,22（3）：1764-1767,1749.
GAO Zhengyang, FANG Lijun, ZHOU Jian, et al . Research on the combustion performance of blended coal in thermal-balance[J]. Power Engineering, 2002, 22(3): 1764-1767, 1749.
[6] ARENILLAS A, RUBIERA F, ARIAS B, et al . A TG/DTA study on the effect of coal blending on ignition behaviour[J]. Journal of Thermal Analysis and Calorimetry, 2004, 76(2): 603-614.
[7] VUTHALURU H B, BROOKE R J, ZHANG D K, et al . Effects of moisture and coal blending on Hardgrove Grindability Index of Western Australian coal [J]. Fuel Processing Technology, 2003, 81 (1): 67-76.
[8] 夏季,华志刚,彭鹏,等. 基于非支配排序遗传算法的无约束多目标优化配煤模型[J]. 中国电机工程学报,2011,31（2）：85-90.
XIA Ji, HUA Zhigang, PENG Peng, et al . A Model of unconstrained multi-objective optimization of coal blending based on the non-dominated sorting genetic algorithm [J]. Proceedings of the CSEE, 2011, 31(2): 85-90.
[9] 张晓萱,黄国和,席北斗,等. 电厂优化配煤的不确定性机会约束非线性规划方法[J]. 中国电机工程学报,2009,29（5）：11-15.
ZHANG Xiaoxuan, HUANG Guohe, XI Beidou, et al . Inexact chance-constrained nonlinear programming method for coal blending in power plants[J]. Proceedings of the CSEE, 2009, 29(5): 11-15.
[10] 陈刚,郝永财,徐远纲,等. 模糊数学在评价锅炉混煤方案中的应用[J]. 动力工程,2008,28（6）：856-858,870.
CHEN Gang, HAO Yongcai, XU Yuangang, et al . Application of fuzzy mathematics in evaluating boiler blended-coal schemes[J]. Journal of Power Engineering, 2008, 28(6): 856-858, 870.
[11] 李德波,狄万丰,李鑫,等. 1 045 MW超超临界贫煤锅炉燃用高挥发分烟煤的燃烧调整研究及工程实践[J]. 热能动力工程,2016,31（1）：117-123.
LI Debo, DI Wanfeng, LI Xin, et al . Study of the adjustment to the combustion in a 1 045 MW ultra-supercritical boiler burning bituminous coal with a high volatile content instead of lean coal and its engineering practice[J]. Journal of Engineering for Thermal Energy and Power, 2016, 31(1): 117-123.
[12] 屠小宝. 600 MW锅炉煤种适应性试验研究[J]. 中国电力,2004, 37（3）：35-37.
TU Xiaobao. Testing and study of coal type adaptability for 600 MW coal-fired boiler [J]. Electric Power, 2004, 37(3): 35-37.
[13] 周臻,刘亮,鄢晓忠. 1 025 t/h锅炉变煤种燃烧的调整试验及分析[J]. 电站系统工程,2008,24（4）：35-38.
ZHOU Zhen, LIU Liang, YAN Xiaozhong. Adjustment test and analysis of off-design coal combustion of 1 025 t/h boiler [J]. Power System Engineering, 2008, 24(4): 35-38.
[14] 周永刚. 扩大煤种适应性的锅炉燃烧系统改造[J]. 动力工程,2006,26（1）：65-69.
ZHOU Yonggang. Reconstruction of a boiler’s combustion system for broadening its coal category adaptalaility [J]. Journal of Power Engineering, 2006, 26(1): 65-69.
[15] 沈跃良,苏余宁,廖宏楷. 1 025 t/h锅炉燃用越南无烟煤和烟煤混煤的燃烧特性的研究[J]. 动力工程,2007,27（6）：885-889.
SHEN Yueliang, SU Yuning, LIAO Hongkai. Study on combustion combustion system for broadening its coal category adaptability [J]. Journal of Power Engineering, 2007, 27(6): 885-889.
[16] 孙路石,曾伟,向军,等. 来宾电厂420 t/h锅炉煤种适应性的分析[J]. 热力发电,2010,39（1）：52-55.
SUN Lushi, ZENG Wei, XIANG Jun, et al . Analysis about adaptability of coal sorts used for 420 t/h boilers in laibin power plant [J]. Thermal Power Generation, 2010, 39(1): 52-55.
[17] 陈文,段学农,陈一平,等. 混煤掺烧中晋城无烟煤对飞灰含碳量的影响及控制措施[J]. 电站系统工程,2010,26（4）：17-19.
CHEN Wen, DUAN Xuenong, CHEN Yiping, et al . Influence and control measurement of carbon content due to anthracite mixed combustion [J]. Power System Engineering, 2010, 26(4): 17-19.
[18] 温文杰,马晓茜,刘翱. 锅炉混煤掺烧的飞灰含碳量预测与运行优化[J]. 热力发电,2010,39（3）：30-35.
WEN Wenjie, MA Xiaoqian, LIU Ao. Prediction of unburned carbon content in fly ash and operation optimization for mixedly burning blended coal in boilers[J]. Thermal Power Generation, 2010, 39(3): 30-35.
[19] 段学农,朱光明,焦庆丰,等. 电厂锅炉混煤掺烧技术研究与实践[J]. 中国电力,2008,41（6）：51-54.
DUAN Xuenong, ZHU Guangming, JIAO Qingfeng, et al . Research and practice of blended coal combustion technology in power plant boiler [J]. Electric Power, 2008, 41(6): 51-54.
[20] 段学农,朱光明,姚斌,等. 混煤可磨特性与掺烧方式试验研究[J]. 热能动力工程,2010,25（4）：410-413.
DUAN Xuenong, ZHU Guangming, YAO Bin, et al . Experimental study of the grind ability and mixed-diluted combustion mode of a blended coal[J]. Journal of Engineering for Thermal Energy and Power, 2010, 25(4): 410-413.
[21] 叶江明. 电厂锅炉原理及设备[M]. 北京：中国电力出版社,2010：19-20.
YE Jiangming. Principle and equipment of power plant boiler [M]. Beijing: China Power Press, 2010: 19-20.