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Research on the determination method of chloride content in urea for hydrolysis-based ammonia production systems in power plants
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Songyan CAO1, Zhenzhen MA1, Jie LI2, Yue QIAO1, Jun YANG1, Wenzhong CHEN3, Shuang HAN1, Yichao MA1, Tong WANG1, Fei SONG1
Thermal Power Generation | 2026, 55(3) : 158 - 164
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Thermal Power Generation | 2026, 55(3): 158-164
• New power generation technology •
Research on the determination method of chloride content in urea for hydrolysis-based ammonia production systems in power plants
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Songyan CAO1, Zhenzhen MA1, Jie LI2, Yue QIAO1, Jun YANG1, Wenzhong CHEN3, Shuang HAN1, Yichao MA1, Tong WANG1, Fei SONG1
Affiliations
  • 1.Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China
  • 2.Huaneng Luohuang Generation Co., Ltd., Chongqing 402000, China
  • 3.Zhanjiang Zhongyue Energy Co., Ltd., Zhanjiang 524012, China
Published: 2026-03-25 doi: 10.19666/j.rlfd.202505088
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In-factory testing of chloride ions in urea for urea-to-ammonia hydrolysis systems in power plants is a crucial task, and how to quickly and accurately detect chloride ions content remains an urgent problem to be solved. This study has proposed a new method for determining the mass concentration of chlorides in urea using silver chloride spectrophotometry. This method is simple and fast, capable of detecting the chloride content in a set of urea samples in about 20 minutes, with a detection range of 0.07 mg/L to 2.00 mg/L and a detection limit of 0.02 mg/L. Eighteen repeated tests were conducted on a 10% urea solution with a chloride ion mass concentration of approximately 0.05 mg/L. The results indicated a relative standard deviation of 8.30%. The recovery rate of spiked tests in the 10% urea solution ranged from 86% to 110%. Both the accuracy and sensitivity of this method meet the quality requirements for urea used in the urea-to-ammonia hydrolysis systems in thermal power plants, making it a suitable method for determining chlorides in urea.

urea hydrolysis for ammonia production  /  quality of urea  /  chloride  /  spectrophotometry
Songyan CAO, Zhenzhen MA, Jie LI, Yue QIAO, Jun YANG, Wenzhong CHEN, Shuang HAN, Yichao MA, Tong WANG, Fei SONG. Research on the determination method of chloride content in urea for hydrolysis-based ammonia production systems in power plants[J]. Thermal Power Generation, 2026 , 55 (3) : 158 -164 . DOI: 10.19666/j.rlfd.202505088
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Article Info
doi: 10.19666/j.rlfd.202505088
  • Receive Date：2025-05-27
  • Online Date：2026-08-14
  • Published：2026-03-25
Article Data
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History
  • Received：2025-05-27
  • Revised：2025-06-11
  • Accepted：2025-06-25
Affiliations
    1.Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China
    2.Huaneng Luohuang Generation Co., Ltd., Chongqing 402000, China
    3.Zhanjiang Zhongyue Energy Co., Ltd., Zhanjiang 524012, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202505088
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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