Dangyang Power Plant Accident
At 15:20 on August 11, 2016, an explosion occurred in the Dangshi Madian Power Generation Company in Dangyang, Hubei Province, killing 22 people and injuring four others. Preliminary investigations by relevant parties showed that the cause of the accident was caused by the rupture of the high-pressure steam pipe and the leakage of steam during the construction and commissioning of the company's thermal power project.
Explosion scene
The casualties are serious and worrying. Looking at the safety accidents of large and small power plants in recent years, the design and operation of the specifications are the top priority for ensuring the safety of power plants. In addition, we should always recognize the major "invisible killer" that threatens the safety of power plants.
The metal ions such as Cu and Fe in the steam pipes of power plants and nuclear power plants will cause the wall thickness of carbon steel or low alloy steel to decrease with the flow of water vapor. In severe cases, high pressure water leaks and even the pipe breaks. Deposition of corrosion products can reduce thermal conductance, cause valve or device failure, and even cause leaks and bursts in the pipeline.
In 1986, the 18-inch condensing pipe on the condensate line of the Surry nuclear power plant in the United States suddenly ruptured during operation, resulting in 4 deaths and 4 injuries and 190 parts replacement.
In 2004, Japan's Mihama Nuclear Power Plant No. 3 second-circuit condensate system, from the low-pressure heater to the deaerator, 560mm diameter carbon steel pipe due to fluid accelerated corrosion damage and sudden leakage accident.
Therefore, it is important to control the content of metal ions in the steam of power plant pipelines. The detailed provisions of GB12145-2008 "Water quality of thermal power generating units and steam power equipment" are as follows:
The National Energy Administration has released the standard method for detecting Fe and Cu in water vapor in the power industry in 2013: DL/T 1202-2013 "Measurement of copper and iron in water vapor of thermal power plants _ dissolution voltammetry method"
The detection limits of voltammetric polarography are: Fe 50ppt, Cu100ppt, which can effectively monitor the copper and iron content in steam, avoid corrosion of pipelines, prevent problems before they occur!
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