Safety interlock solution for calcium carbide process vinyl chloride mixer
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This topic was raised in the forum back in 2009, and no effective solution was found. The traditional approach involves using the temperature of the mixer as a trigger for interlocks that shut down the system. It is said that the reactivity of chloroacetylene is unstable; relying on temperature for interlocks poses problems due to the lag in temperature measurement and the speed at which the medium reacts, which makes it difficult to shut down the system safely. Often, interlocks are activated only after an explosion occurs. Therefore, I ask experts to discuss this issue in order to contribute to the industry and improve its safety standards.
No one responded; it’s a good topic. I have a question: are there any cases where the temperature of the mixer containing chlorine doesn’t change, but reactions still occur afterward?
Yes! Indeed, sometimes the mixer doesn’t have time to react in time
Have you guys experienced this before? Could you explain it in detail?
It just didn’t have time to be cut off, so the explosion-proof membrane burst
The temperature interlock is not fast enough; can detecting free chlorine in hydrogen chloride be used as a solution?
There is no good solution for now, but installing an online free chlorine detector on the hydrogen chloride main pipe at the exit of the synthesis furnace would yield better results.
The interlocked online analyzer for free chlorine is better, and there are also devices for premixing, which can be useful in situations where synthesis and VCM are located at some distance from each other
That’s impossible; there will definitely be a temperature response