The Theoretical Calculation of Designed Temperature of Flue Gas in Low-Low Temperature Electrostatic Precipitator and the Existing Problems

doi:10.11930/j.issn.1004-9649.2016.07.151.06

Abstract

Abstract: Compared with the traditional electrostatic precipitator, the low-low temperature electrostatic precipitator(LLT-ESP) has some advantages in the aspects of energy conservation and environmental protection. This paper conducts a study on the practical application cases of LLT-ESP both at home and abroad, analyzing the differences of their designed flue gas temperatures. The conclusion is that the correct estimate of the gas acid dew-point is crucial for the temperature designing of LLT-ESP. Taking a typical 600-MW coal-fired power plant for example, three widely-used methods are adopted to calculate the acid dew-point with the corresponding accuracy and possible problems being analyzed. In addition, the D/S ratio is calculated to evaluate the device corrosion potential and the feasibility of LLT-ESP. At the end, suggestions on the temperature design of LLT-ESP are proposed, and the possible problems in the LLT-ESP operation when the flue gas temperature being long-term higher than the acid dew point. are analyzed.

Key words: coal-fired power plant, low-low temperature electrostatic precipitator, acid dew-point, flue gas temperature calculation

CLC Number:

X701.2

SHEN Yanmei, DONG Kun, CUI Zhiyong, WEI Shuzhou. The Theoretical Calculation of Designed Temperature of Flue Gas in Low-Low Temperature Electrostatic Precipitator and the Existing Problems[J]. Electric Power, 2016, 49(7): 151-156.

Add to citation manager EndNote|Ris|BibTeX

URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.07.151.06

https://www.electricpower.com.cn/EN/Y2016/V49/I7/151

References

[1] MORI Yusuke, TSUMITA Yoshimitsu, MATSUMOTO Ario, et al . Operation results of IHI flue gas desulfurization system-unit No.1 (1 000 MW) of Hitachinaka thermal power station for TEPCO [J]. IHI Engineering Review, 2006, 39(1): 22-26.
[2] 崔占忠,龙辉,龙正伟,等. 低低温高效烟气处理技术特点及其在中国的应用前景[J]. 动力工程学报,2012,32（2）：152-158.
CUI Zhanzhong, LONG Hui, LONG Zhengwei, et al . Technical features of lower temperature high efficiency flue gas treatment system and its application prospects in China[J]. Journal of Chinese Society of Power Engineering. 2012, 32(2): 152-158.
[3] 何毓忠,赵海宝,郦建国,等. 低低温电除尘器灰硫比计算及中国煤种分析[J]. 环境工程,2015,33（2）：76-79.
HE Yuzhong, ZHAO Haibao, LI Jianguo, et al . Calculation of dust/SO 3 ratio for low-low temperature electrostatic precipitator and analysis of coals in China[J]. Environmental Engineering, 2015, 33(2): 76-79.
[4] 廖增安,罗如生,蒙骝,等. 燃煤电厂余热利用低低温电除尘技术研究与开发[C]//第十五届中国电除尘学术会议论文集.2013：9-16.
[5] 史晓宏,李广滨,魏书州,等. 350 MW燃煤机组降低烟尘排放技术的研究与实践[J]. 中国电力,2015,48（5）：93-96.
SHI Xiaohong, Li Guangbin, Wei Shuzhou, et al . Research and practice on dust emission reduction technology in 350 MW coal- fired generator unit [J]. Electric Power, 2015, 48(5): 93-96.
[6] 杜和冲,吴克锋,申建东,等. 烟气深度冷却系统在1 000 MW超超临界机组的应用[J]. 中国电力,2014,47（4）：32-37.
DU Hechong, WU Kefeng, SHEN Jiandong, et al . Application of flue gas deep cooling system in 1 000-MW ultra-supercritical units [J]. Electric Power, 2014, 47(4): 32-37.
[7] 王凤平,李明. 混合烟气体系露点温度的热力学分析[J]. 石油化工腐蚀与防护,2002,19（1）：56-59.
WANG Fengping, LI Ming. Thermodynamic analysis of dew point temperature in mixed flue gas system [J]. Petrochemical Corrosion and Protection, 2002, 19(1): 56-59.
[8] 杨彦,李进,王俊,等. 湿法脱硫后烟气酸露点变化和烟气腐蚀性评价[C]//中国电机工程学会年会. 2010：199-206.
[9] 赵海宝,郦建国,何毓忠,等. 低低温电除尘关键技术研究与应用[J]. 中国电力,2014,47（10）：117-121,147.
ZHAO Haibao, LI Jianguo, HE Yuzhong, et al . Research and application on low-low temperature electrostatic precipitator technology [J]. Electric Power, 2014, 47(10): 117-121, 147.
[10] 土屋喜重,川西好光,大西召一,等. Very cold electrostatic technology of advanced flue gas treatment system for coal-fired boiler [J]. 三菱重工技报,1997,34（3）：158-161.
[11] 柳生隆志,土屋喜重,大西召一,等. Recent electrostatic precipitation technology [J]. 三菱重工技报,1996,33（1）：69-73.
[12] 张建中. 对烟气SO x 排量计算、脱硫前后烟气露点温度预测及烟气腐蚀性评定中若干问题的讨论[J]. 热机技术,2013（增刊）：84-99.
ZHANG Jianzhong. Emission calculation of SO x , Prediction of flue gas dew point temperature before and after flue gas desulfurization, and Discussions on some issues of the flue gas corrosion resistance evaluation [J]. Heat Power Technic, 2013(S): 84-99.
[13] SD 208—1987. 火力发电厂环境影响报告书编制原则和内容深度规定[S].
[14] DL/T 567.7—95.火电厂燃料试验方法灰及渣中硫的测定和燃煤可燃硫的计算[S].
[15] 冯俊凯,沈幼庭,杨瑞昌. 锅炉原理及计算[M]. 北京：科学出版社,2003.
[16] 石丽娜. 火电厂脱硫烟气再热后腐蚀性的研究[D]. 保定：华北电力大学,2005.
[17] 刘含笑,姚宇平,郦建国,等. 燃煤电厂烟气中SO 3 生成、治理及测试技术研究[J]. 中国电力,2015,48（9）：152-156.
LIU Hanxiao, YAO Yuping, LI Jianguo, et al . Study on SO 3 generation, control and testing technology for coal-fired power plants [J]. Electric Power, 2015, 48(9): 152-156.
[18] 王超,刘小伟,徐义书,等. 660 MW燃煤锅炉细微颗粒物中次量与痕量元素的分布特性[J]. 化工学报,2013,64（8）：2975-2981.
WANG Chao, LIU Xiaowei, XU Yishu, et al . Distribution characteristics of minor and trace elements in fine particulate matters from a 660 MW coal-fired boiler[J]. CIESC Journal, 2013, 64(8): 2975-2981.
[19] 张建中. 对燃煤锅炉烟气酸露点温度现行计算方法的述评和优化改进问题探讨[J]. 全面腐蚀控制,2012,26（10）：1-6.
ZHANG Jianzhong. Review on current calculating method of gas acid dew point temperature for coal fired boilers and inquire into its optimization and improvement[J]. Total Corrosion Control, 2012, 26(10): 1-6.
[20] 陈牧,胡玉清,桂本,等. 利用协同治理技术实现燃煤电厂烟尘超低排放[J]. 中国电力,2015,48（9）：146-151.
CHEN Mu, HU Yuqing, GUI Ben, et al . Synergistic control technology for ultra-low PM emission from coal-fired power plants and its application [J]. Electric Power, 2015, 48(9): 146-151.