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- Title
尿素漏入引起机组水汽品质劣化的事故分析及处理.
- Authors
徐兴宪
- Abstract
After the implementation of the liquid ammonia to urea conversion project in a coal-fired power plant, urea leakage into the steam-water system of unit may lead to deteriorated steam-water quality. With an unscheduled shutdown of a 1, 000 MW unit due to urea leakage into water-steam system as an example, the accident phenomenon, treatment process, investigation and analysis process, formulation of precautionary measures, and diagnostic means are discussed. Abnormal increase of feedwater hydrogen conductivity is the main accident phenomenon. Through analysis the laws of correlation between feedwater hydrogen conductivity, ammonium ions and TOCi contents of demineralized water and condensate, it is determined that the accident is caused by leakage of urea into the water-steam system. The systematic investigation shows that the accident results fundamentally from the contamination of raw water in the power plant by wastewater from the urea station. Meanwhile, measures to prevent urea leakage into the water-steam system and means to diagnose urea leakage into the system are proposed.
- Subjects
COAL-fired power plants; LIQUID ammonia; AMMONIUM ions; WATER power; WATER pollution
- Publication
Zhejiang Electric Power, 2023, Vol 42, Issue 10, p114
- ISSN
1007-1881
- Publication type
Article
- DOI
10.19585/j.zjdl.202310014