Pilot experimental study of urea hydrolysis for deNOx in coal plant

doi:10.16085/j.issn.1000-6613.2016.s1.054

Abstract

Abstract: Based on the domestically developed urea hydrolysis reactor and urea hydrolysis ammonia process, a pilot test of urea hydrolysis with 10kg/h ammonia production for the flue gas denitration reductant was established, to reduce pollution of NO_x emission from coal plant.The results showed that urea hydrolysis reaction rate was controlled by the temperature monotonically.Steam consumption increases with the increase of pressure, intensifies when pressure is greater than 0.6MPa and brings about lower economy.The higher feed concentration, the lower energy loss for the water latent heat of vaporization, and the lower operation cost of device.The maximum ammonia production is 16kg/h, the hydrolysis rate is greater than 98%, and the ammonia mass fraction of product gas is 22.6%~34%(volume fraction of 28.5%~48%) during the tests, at the feed concentration of 40%~60%, and the operate pressure and temperature of 0.6MPa and 160℃.

Key words: denitration reductant, urea hydrolysis, ammonia, pilot test

摘要： 为降低火电厂NO_x排放造成的环境污染,采用尿素水解法制备烟气脱硝还原剂,在自主研发尿素水解反应器和尿素水解制氨工艺的基础上,搭建产氨量10kg/h规模的尿素水解中试试验台。结果表明,尿素水解反应速率是由温度控制的单调递增函数,蒸汽耗量随反应压力的增加而增加,当反应压力大于0.6MPa时加剧,装置经济性降低。提高进料浓度可减少过量水吸热造成的能量损失,有益于降低装置运行成本。多批次测试期间,进料浓度为40%~60%,操作压力与温度为0.6MPa、160℃,装置最大产氨量为16kg/h,水解率均大于98%,产品气氨气质量分率22.6%~34%(体积分率28.5%~48%),装置性能良好。

关键词: 脱硝还原剂, 尿素水解, 氨气, 中试试验

CLC Number:

TQ031

XIANG Xiaofeng, ZHANG Xiangyu, ZHANG Bo, GAO Ning, LU Xu, XU Hongjie. Pilot experimental study of urea hydrolysis for deNO_x in coal plant[J]. Chemical Industry and Engineering Progree, 2016, 35(S1): 332-336.

向小凤, 张向宇, 张波, 高宁, 陆续, 徐宏杰. 火电厂脱硝用尿素水解中试试验[J]. 化工进展, 2016, 35(S1): 332-336.

References

[1] 中华人民共和国环境保护部.火电厂大气污染物排放标准:GB13223-2011[S].北京:中国环境科学出版社.
[2] 国家环境保护总局.固定污染源烟气排放连续监测技术规范:HJ/T 75-2007[S].北京:中国环境科学出版社.
[3] 闫维明,郁金星,邹思诣.SCR法烟气脱硝系统调试分析[J].能源环境保护,2012,26(8):23-26.
[4] 黄东.火电行业氮氧化物控制技术经济分析[D].南京:南京信息科技大学环境科学,2013.
[5] 刘慷,肖志均,谭效德,等.选择性催化还原烟气脱硝技术应用[J].中国电力,2009,42(8):75-79.
[6] 杜成章,刘诚.尿素热解和水解技术在锅炉烟气脱硝工程中的应用[J].华北电力技术,2010(6):39-41.
[7] 王建光.燃煤电站SCR脱硝技术中尿素热解和水解制氨技术对比[J].能源与环境,2008(4):59-60.
[8] 姚宣,沈滨,郑鹏.烟气脱硝用尿素水解装置性能分析[J]. 中国电机工程学报,2013,33(14):38-43.
[9] 惠润堂,韦飞,闫世平,等.国产首套尿素水解装置在大型火电厂的工业应用及技术优化[J].中国电力,2014,47(7):150-155.
[10] 徐宏杰,林伟杰,王月明,等.一种尿素溶液水解反应器:201310400325.4[P].2015-06-17.
[11] 张波,张向宇,向小凤,等.一种尿素水解反应器出口除雾装置:201420397125.8[P].2014-12-10.
[12] 向小凤,张波,张向宇,等.一种尿素水解反应器的气相分离取样系统:201420684017.9[P].2015-03-18.
[13] EDWARDS T J,MAUER G,NEWMAN J,et al. Vapor-liquid equilibria in multicomponent aqueous solutions of volatile weak electrolytes[J].AIChE J.,1978,24(2):966-976.
[14] SAHU J,PATWARDHAN A,MEIKAP B.Equilibrium and kinetic studies of in situ generation of ammonia from urea in a batch reactor for flue gas conditioning of thermal power plants[J].Industrial & Engineering Chemistry Research,2009,48(5):2705-2712.
[15] SAHU J,CHAVA V,HUSSAIN S,et al.Optimization of ammonia production from urea in continuous process using ASPEN Plus and computational fluid dynamics study of the reactor used for hydrolysis process[J].Journal of Industrial and Engineering Chemistry,2010,16(4):577-586.
[16] WEI Shunan,ZHANG Hongjing.Calculation of H₂O-NH₃-CO₂ vapor liquid equilibria at high concentration conditions[J].Chinese J.Chem.Eng.,2004,12(1):134-136.
[17] MAHALIK K,SAHU J,PATWARDHAN A V,et al. Kinetic studies on hydrolysis of urea in a semi-batch reactor at atmospheric pressure for safe use of ammonia in a power plant for flue gas conditioning[J].Journal of hazardous materials,2010,175(1):629-637.

Pilot experimental study of urea hydrolysis for deNO_x in coal plant

火电厂脱硝用尿素水解中试试验

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	LAI Shini, JIANG Lixia, LI Jun, HUANG Hongyu, KOBAYASHI Noriyuki. Research progress of ammonia blended fossil fuel [J]. Chemical Industry and Engineering Progress, 2023, 42(9): 4603-4615.
[2]	YANG Pengwei, YU Linzhu, WANG Fangfang, JIANG Haoxuan, ZHAO Guangjin, LI Qi, DU Mingzhe, MA Shuangchen. Application prospect, challenge and development of ammonia energy storage in new power system [J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4432-4446.
[3]	ZENG Tianxu, ZHANG Yongxian, YAN Yuan, LIU Hong, MA Jiao, DANG Hongzhong, WU Xinbo, LI Weiwei, CHEN Yongzhi. Effects of hydroxylamine on the activity and kinetic parameters of nitrifying bacteria [J]. Chemical Industry and Engineering Progress, 2023, 42(6): 3272-3280.
[4]	LIU Hongru, LIN Wensheng. Energy efficiency and carbon emission analysis of hydrogen transport chains based on liquid hydrogen and ammonia [J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1291-1298.
[5]	SUN Hui, MENG Xianghai, WEI Jinghai, ZHOU Hongjun, XU Chunming. New scene for ammonia synthesis by green hydrogen [J]. Chemical Industry and Engineering Progress, 2023, 42(2): 1098-1102.
[6]	SONG Yukun, WANG Guogang, ZHANG Xingong, LIU Dakuo, ZHANG Jinqing, LIN Han. SNAR: a new non-amino reduction technology for acid and denitration [J]. Chemical Industry and Engineering Progress, 2022, 41(S1): 606-612.
[7]	WANG Zhen, YAN Ting, HUO Yingjie. Performance of thermochemical sorption heat storage using manganese chloride/ammonia [J]. Chemical Industry and Engineering Progress, 2022, 41(8): 4425-4431.
[8]	GUAN Haoran, ZHU Lina, ZHU Lingyue, YUAN Dandan, ZHANG Yuqing, WANG Baohui. Progress and challenges of electrochemical synthesis of ammonia from different hydrogen and nitrogen sources [J]. Chemical Industry and Engineering Progress, 2022, 41(8): 4098-4110.
[9]	WANG Chaochao, WU Yiling, CHEN Jiaqiao, CAI Tianning, LIU Wenru, LI Xiang, WU Peng. A novel anaerobic hydrolysis acidification-partial denitrification anaerobic ammonia oxidation process for advanced nitrogen removal from simulated domestic and nitrate-containing wastewater [J]. Chemical Industry and Engineering Progress, 2022, 41(7): 3890-3899.
[10]	LU Zhiqiang, ZHANG Liang, LI Jun, FU Qian, ZHU Xun, LIAO Qiang, CHEN Pengyu. Effects of load on power generation and copper removal rate of thermally regenerative ammonia-based batteries [J]. Chemical Industry and Engineering Progress, 2022, 41(6): 3341-3349.
[11]	XIA Xin, LIN Jianmin, LI Yan, TAO Zhiping. Research progress on performance and application of ammonia fuel on engines [J]. Chemical Industry and Engineering Progress, 2022, 41(5): 2332-2339.
[12]	WANG Yuguang, ZHANG Xingxing, WANG Chaochao, XIA Yunkang, WANG Yao, ZHOU Cheng, WU Yiling, WU Peng, XU Lezhong. Achieving advanced nitrogen and phosphorus removal based on denitrifying phosphorus removal and partial denitrification Anammox process [J]. Chemical Industry and Engineering Progress, 2022, 41(4): 2191-2201.
[13]	DENG Yaling, SHU Jiancheng, CHEN Mengjun, LEI Tianya, ZENG Xiangfei, YANG Yong, LIU Zuohua. Physical and chemical properties analysis of electrolytic manganese residue in different storage times [J]. Chemical Industry and Engineering Progress, 2022, 41(4): 2161-2170.
[14]	LI Ao, WANG Hongyang, SUN Yuwei, WANG Xu, WANG Xia, ZHU Guangcan. Model and optimization of flow electrode capacitive deionization for ammonium ion removal [J]. Chemical Industry and Engineering Progress, 2022, 41(4): 2123-2131.
[15]	GUAN Jingying, ZHANG Huanhuan, SU Zikai, SHI Daxin, WU Qin, CHEN Kangcheng, ZHANG Yaoyuan, LI Hansheng. Recent progress in nickel-based catalysts for ammonia decomposition to hydrogen [J]. Chemical Industry and Engineering Progress, 2022, 41(12): 6319-6337.