What is the reason why ignition cannot be carried out immediately after shutting down the furnace?
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What are the reasons why ignition cannot be carried out immediately after shutting down the furnace? These issues are generally not checked, probably out of concern that high temperatures might affect the graphite and cause it to crack
1. There is residual gas in the furnace, such as a mixture of gases like hydrogen and chlorine. 2. Analyze the reasons for shutdown, check whether the chlorine and hydrogen levels are within acceptable limits, to prevent hazards. 3. Check whether the operating conditions are met. That’s all I have to say
The start-up and shutdown of synthesis furnaces must strictly follow the operating ticket system, with each item being checked thoroughly. Blind start-up or shutdown can easily lead to accidents such as explosions
After the furnace is shut down, there may be residual flammable gases inside; an explosion can occur if these gases reach their explosive limit. It is necessary to purge the furnace first before it can be restarted
After the furnace is shut down, there may be residual flammable gases inside; an explosion can occur if these gases reach their explosive limit. It is necessary to purge the furnace first before it can be restarted
After the furnace is shut down, there may be residual flammable gases inside; an explosion can occur if these gases reach their explosive limit. It is necessary to purge the furnace first before it can be restarted
This post was last edited by wgoywgoy on 2019-3-11 at 13:23. The explosive ranges of mixtures of hydrogen with air, oxygen, and chlorine are as follows: when the hydrogen content is between 4.1–74.2% (vol), 4.5–95% (vol), or 3.5–97% (vol). In mixtures containing chlorine, the hydrogen content must be kept within 3–7% (vol). Ignition of these mixtures results in explosions. Therefore, for safety reasons, after shutting down the furnace, it is necessary to purge it with nitrogen. The hydrogen content inside the furnace must be strictly controlled; only when it meets the specified limits can the furnace be restarted. There have also been incidents where the furnace failed to start or shut down properly; without carrying out nitrogen purging or re-analyzing the hydrogen content inside the furnace, explosions occurred, resulting in damage to the graphite in the synthesis furnace.
After shutting down the furnace, combustible gases may remain inside; igniting them directly could cause an explosion
Film evaporators and exhaust gas absorption towers may contain mixed explosive gases that can explode at the slightest spark
Analysis is required before lighting the furnace; it can only be lit after passing the inspection!