Experimental Research On Explosion Characters Of Metallurgical Gases In High Temperatures

The outlet temperature of the metallurgical gases is about1000℃. Normally the temperature must be cooled down to200℃before utilizing by spraying water. A lot of sensible heat was wasted. In order to use this part of energy safely, the explosion characters at high temperature must be studied to provide experimental bases for the risk analysis and explosion proof designing of the process equipment..The experimental gases are fabricated in laboratory, and explosion vessel is manufactured in accordance with claims in the standard of DIN EN1839, which defines the Determination of explosion limits of gases and vapours, then the explosion parameters of sample gases, including explosion limits, maximum explosion pressures, and limiting oxygen contents, are studied in25℃,200℃,400℃and500℃.Main work are as follows:(1) Explosion limits of the five sample gases in different temperatures are both measured in labs and calculated by Le Chatelier’s formula, the comparison result is that the explosion limits are narrower estimated by the formula. Influences of different temperature on explosion limits are obtained:the higher the temperature, the wider the explosion limits for same sample; the higher the concentrate of CO in samples, the wider the explosion limits for different samples.(2) Maximum explosive pressures are both measured in labs and calculated through the theories of chemical thermodynamics, combustion and engineering thermo-dynamics, the comparison result is that the variation trend of explosive pressures measured in labs are in accordance with the calculated data. Besides, the influences of temperature on Maximum explosive pressure are summarized:the higher the concentrate of CO in samples, the greater the explosive pressure for different samples; the higher the temperature, the lower the explosive pressure for same sample.(3) The limiting oxygen contents of samples in different temperatures are measured in labs, also the minimum oxygen contents of lower explosion limits are computed. By contrasting, the conclusion is the computed minimum oxygen contents are greater than limiting oxygen contents measured, it’s more dangerous to use computed minimum oxygen contents as judgment of explosion, while it’s more reliable to use limiting oxygen contents obtained in labs.The research above provides reliable data to the anti-explosion design of devices, and has a significant guidance on risk assessment and safety work in industries process.