Leakage detection method for closed circulating water system of calcium carbide furnace

Abstract

The invention discloses a leakage detection method for a closed circulating water system of a calcium carbide furnace. The method comprises the following steps that flow meters and thermometers are installed on cooling water return branch pipes of all equipment parts of the calcium carbide furnace to collect data in real time, and the change trend of flow and the change trend of temperature of all the branch pipes are recorded; a micro-differential pressure transmitter is arranged on the water supplement position of a high-level surge tank of the system to record the change trend of the liquid level; a dynamic alarm model between the change trend of the flow of the branch pipes and the change trend of the liquid level is established; alarm values of the trend difference of the flow of the branch pipes are synthesized to obtain alarm thresholds of the trend difference of the liquid level of the surge tank of different cycles, and leakage detection and positioning performed on the closed circulating water system of the calcium carbide furnace are completed according to the change trend of the flow and the change trend of the temperature of all the branch pipes. According to the leakage detection method for the closed circulating water system of the calcium carbide furnace, the number of the installed high-accuracy flow meters is greatly reduced, the leakage detection accuracy of the system is improved, the response speed is increased, and meanwhile system cost is effectively lowered. In this way, the leakage detection method provides a reliable guarantee for stable and safe production of calcium carbide furnaces.

Description

technical field [0001] The invention relates to the technical field of chemical smelting, in particular to a leakage detection method for a closed circulating water system of a calcium carbide furnace. [0002] Background technique [0003] my country is currently the largest producer of calcium carbide in the world. Since 2002, many large-scale calcium carbide production lines have been built in Northwest China, Xinjiang and Inner Mongolia. In recent years, calcium carbide production technology has gradually transitioned from semi-closed to closed, especially from Norway and Germany. Introduced ultra-large sealed calcium carbide furnaces, the maximum capacity of the Inner Mongolia and Ningxia calcium carbide furnace projects just put into operation reached 81000kVA. Due to its low energy consumption and stable water quality, the closed circulating water system has gradually been applied and promoted in the application of calcium carbide furnace cooling systems with the tec...

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Problems solved by technology

Due to the extensive use of high-precision instruments, this solution is expensive, and in the application, due to the complicated working conditions during the operation of the calcium carbide furnace, the unstable control of furnace pressure, temperature and gas will lead to a sudden increase in the local temperature of the equipment components, causing Part of the water in the branch pipe is vaporized, which affects the reading value of the instrument. Due to the different location and time of vaporization, the error of the instrument is further enlarged, and many false alarms are generated. In order to reduce false alarms, the alarm threshold is often set much higher than that of the two instruments. The accumulative accuracy, while the monitoring of small leaks is difficult to achieve, which has become a major safety hazard during the operation of calcium carbide furnaces

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