数字全息在线测量煤粉粒度分布

doi:10.11949/j.issn.0438-1157.20171242

摘要/Abstract

摘要：

煤粉粒度是燃煤电厂的重要指标，在线测量煤粉粒度能够即时指导锅炉优化运行，对节能减排具有重要意义。搭建了一套模拟一次风粉管道的煤粉粒径在线测量的装置，解决了传统取样方法堵塞和测量实时性差的问题，并设计实验研究数字全息在线测量煤粉粒度的可行性和可靠性。实验结果表明，数字全息在线测量煤粉粒度分布曲线与激光粒度仪的测量曲线趋势一致，平均粒径相对误差为5.6%，表征粒度分布的关键参数d₅₀和d₉₀的相对误差均低于2%，满足工业应用的需求。数字全息技术对稀释前后不同浓度的煤粉粒径关键参数的测量相对误差均低于7%，稀释前后的煤粉粒度的数量分布和体积曲线的趋势一致，验证了数字全息技术在线测量煤粉粒度分布的可靠性，为整体测量装置的开发奠定了基础。

关键词: 数字全息, 在线测量, 粒子, 粒度分布

Abstract:

Particle size distribution of coal powder is one of the most important indexes which contribute a lot to energy conservation and emission reduction of power plant. Digital holography is applied to measure the particle size distribution on a set of device stimulating the actual working conditions of coal supply system of power station. The results show that the distribution curve measured by digital holography has the similar trend with the curve measured by laser particle size analyzer. The relative error between the average diameters is 5.6%. The relative errors between the d₅₀ and d₉₀, are less than 2% which is in the allowable range. The relative errors between before and after the dilution is lower than 7%. The trends of particle size distribution curve of the same sample are consistent in different conditions. The reliability of digital holography for on-line measurement of pulverized coal particle size distribution is verified, which lays a foundation for the development of the overall measurement instrument.

Key words: digital holography, on-line measurement, particle, size distribution

中图分类号:

TK16

赵亮, 吴晨月, 林小丹, 吴迎春, 吴学成, 周永刚, 邱坤赞, 岑可法. 数字全息在线测量煤粉粒度分布[J]. 化工学报, 2018, 69(2): 611-617.

ZHAO Liang, WU Chenyue, LIN Xiaodan, WU Yingchun, WU Xuecheng, ZHOU Yonggang, QIU Kunzan, CEN Kefa. On-line measurement of coal powder size distribution using digital holography[J]. CIESC Journal, 2018, 69(2): 611-617.

参考文献 30

[1]	姜秀民, 李巨斌, 邱健荣. 煤粉颗粒粒度对煤质分析特性与燃烧特性的影响[J]. 煤炭学报, 1999, 24(6):643-647. JIANG X M, LI J B, QIU J R. The influence of particle size on compositions analyzing and combustion characteristics of pulverized coal[J]. Journal of China Coal Society, 1999, 24(6):643-647.
[2]	薛兴华, 王运泉, 肖晨生, 等. 电厂煤粉粒度特征及其对煤粒燃烧的影响[J]. 煤炭转化, 2006, 29(3):58-61. XUE X H, WANG Y Q, XIAO C S, et al. Size characteristic of pulverized coal and its effect on coal particle combustion in coal fired power plant[J]. Coal Conversion, 2006, 29(3):58-61.
[3]	金晶, 李瑞阳, 张忠孝. 煤粉粒度对煤粉燃烧NOx排放的影响[J]. 环境科学学报, 2005, 25(4):502-506. JING J, LI R Y, ZHANG Z X. The effect of pulverized coal size on nitrogen oxides emission performance from pulverized coal combustion[J]. Acta Scientiae Circumstantiae, 2005, 25(4):502-506.
[4]	SUNG Y, MOON C, EOM S, et al. Coal-particle size effects on NO reduction and burnout characteristics with air-staged combustion in a pulverized coal-fired furnace[J]. Fuel, 2016, 182:558-567.
[5]	LI Q, JIANG J, ZHANG Q, et al. Influences of coal size, volatile matter content, and additive on primary particulate matter emissions from household stove combustion[J]. Fuel, 2016, 182:780-787.
[6]	刁源生. 筛分法测定钛精矿粒度分布[J]. 中国粉体技术, 2015, 21(3):76-79. DIAO Y S. Determination of particle size distribution for titanium concentrate by sieving method[J]. China Powder Science and Technology, 2015, 21(3):76-79.
[7]	刘辉, 史学峰, 李丽珍. 筛分法和显微镜法对矿化垃圾粒径分布的比较[J]. 环境工程学报, 2014, 8(9):4007-4011. LIU H, SHI X F, LI L Z. Comparative between sieving method and microscope in particle size distribution of aged refuse[J]. Chinese Journal of Environmental Engineering, 2014, 8(9):4007-4011.
[8]	鲁应华. 激光粒度法测定煤粉粒度分布[J]. 大氮肥, 2012, 35(5):303-306. LU Y H. Measurement of particle-size distribution of pulverized-coal by laser-granularity method[J]. Large Nitrogenous Fertilizer Industry, 2012, 35(5):303-306.
[9]	卢珊珊, 陆海峰, 郭晓镭, 等. 激光粒度仪测定煤粉粒度及分布的方法研究[J]. 中国粉体技术, 2010, 16(4):5-8. LU S S, LU H F, GUO X L, et al. Determination method of particle size and distribution of coal by laser size analyzes[J]. China Powder Science and Technology, 2010, 16(4):5-8.
[10]	CARTER R M, YAN Y. On-line particle sizing of pulverized and granular fuels using digital imaging techniques[J]. Measurement Science & Technology, 2003, 14(7):1099.
[11]	QIAN X, YAN Y, WANG L, et al. An integrated multi-channel electrostatic sensing and digital imaging system for the on-line measurement of biomass-coal particles in fuel injection pipelines[J]. Fuel, 2015, 151:2-10.
[12]	GAO L, YAN Y, CARTER R M, et al. On-line particle sizing of pneumatically conveyed biomass particles using piezoelectric sensors[J]. Fuel, 2013, 113:810-816.
[13]	ZHOU J, CAO Z, XIE H, et al. Compressive sensing for particle size retrieval by using a digital micro-mirror device-based detector[J]. Powder Technology, 2016, 304:27-31.
[14]	ZHANG J Q, YAN Y. On-line continuous measurement of particle size using electrostatic sensors[J]. Powder Technology, 2003, 135/136:164-168.
[15]	杨红波, 杨磊. 超声衰减粒度仪在煤粉粒度测量中的应用[J]. 中国仪器仪表, 2012, 5:67-69. YANG H B, YANG L. Ultrasonic attenuation particle size analyzer is used on the particle size measurement of coal[J]. China Instrumentation, 2012, 5:67-69.
[16]	苏明旭, 袁安利, 周健明, 等. 超声衰减与光散射法蒸汽液滴粒径和含量对比测试[J]. 中南大学学报(自然科学版), 2016, 47(2):654-660. SU M X, YUAN A L, ZHOU J M, et al. Measurement of steam droplet size and content:a comparison of ultrasonic attention and light scattering[J]. Journal of Central South University (Science and Technology), 2016, 47(2):654-660.
[17]	苏明旭, 周健明, 汪雪, 等. 超声谱法在颗粒两相流测量中的应用进展[J]. 中国粉体技术, 2016, 22(5):22-27. SU M X, ZHOU J M, WANG X, et al. Developments and applications of ultrasound spectroscopy in particle characterization[J]. Powder Science and Technology, 2016, 22(5):22-27.
[18]	蔡小舒, 欧阳新, 李俊峰, 等. 电厂煤粉在线实测研究[J]. 工程热物理学报, 2002, 23(6):753-756. CAI X S, OUYANG X, LI J F, et al. Online measurement of pulverized coal at power station[J]. Journal of Engineering Thermophysics, 2002, 23(6):753-756.
[19]	蔡小舒, 潘咏志, 欧阳新, 等. 电厂煤粉管道中煤粉运行状况诊断研究[J]. 中国电机工程学报, 2001, 21(7):84-87. CAI X S, PAN Y Z, OUYANG X, et al. The study of diagnosing the running condition of pulverized coal in pipe[J]. Proceedings of the CSEE, 2001, 21(7):84-87.
[20]	秦授轩, 蔡小舒. 在线测量煤粉粒度分布和浓度的实验研究[J]. 中国电机工程学报, 2010, 30(32):30-34. QIN S X, CAI X S. Experimental study on in-line measurement of size distribution and concentration of pulverized coal[J]. Proceedings of the CSEE, 2010, 30(32):30-34.
[21]	GABOR D. A new microscopic principle[J]. Nature, 1948, 161(4098):777.
[22]	王广俊. 数字全息技术及其在测量中的应用研究[D]. 北京:北京工业大学, 2011. WANG G J. Study on digital holography and its applications in the field of measurement[D]. Beijing:Beijing University of Technology, 2011.
[23]	WU Y, WU X, YAO L, et al. 3D boundary line measurement of irregular particle with digital holography[J]. Powder Technology, 2016, 295:96-103.
[24]	GUNDOGDU O. Positron emission zone plate holography for particle tracking[J]. Nuclear Instruments and Methods in Physics Research Section A:Accelerators, Spectrometers, Detectors and Associated Equipment, 2006, 556(2):624-640.
[25]	WICHITWONG W, CO TMELLEC S, LEBRUN D, et al. Long exposure time digital in-line holography for the trajectography of micronic particles within a suspended millimetric droplet[J]. Optics Communications, 2014, 326:160-165.
[26]	HIRSCH J E. Apparent increase in the thickness of superconducting particles at low temperatures measured by electron holography[J]. Ultramicroscopy, 2013, 133:67-71.
[27]	周斌武, 吴学成, 吴迎春, 等. 数字显微全息中记录参数对颗粒测量影响的数值模拟[J]. 物理学报, 2013, 20:1-8. ZHOU B W, WU X C, WU Y C, et al. Influence of recording parameters on particle field measurement by digital holographic microscopy:a numerical investigation[J]. Acta Physica Sinica, 2013, 20:1-8.
[28]	MURATA S, YASUDA N. Potential of digital holography in particle measurement[J]. Optics & Laser Technology, 2000, 32(7/8):567-574.
[29]	吴学成, 浦兴国, 浦世亮, 等. 激光数字全息应用于两相流颗粒粒径测量[J]. 化工学报, 2009, 60(2):310-316. WU X C, PU X G, PU S L, et al. Particle sizing for gas-solids flow with digital in-line holography[J]. CIESC Journal, 2009, 60(2):310-316.
[30]	王晓梦. 电厂60万千瓦机组煤粉浓度测量系统研究[D]. 南京:南京理工大学, 2014. WANG X M. Research on measurement of pulverized coal concentration of primary in power plant[D]. Nanjing:Nanjing University of Science and Technology, 2014.s & Laser Technology, 2000, 32(7-8):567-574.
[29]	吴学成, 浦兴国, 浦世亮, 等. 激光数字全息应用于两相流颗粒粒径测量[J]. 化工学报, 2009, 60(2):310-316. WU X C, PU X G, PU S L, et al. Particle sizing for gas-solids flow with digital in-line holography[J]. CIESC Journal, 2009, 60(2):310-316.
[30]	王晓梦. 电厂60万千瓦机组煤粉浓度测量系统研究[D]. 南京理工大学, 2014. WANG X M. Research on measurement of pulverized coal concentration of primary in power plant[D]. NUST, 2014.