Explosion-proof issues of urea
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Explosion-proof issues of urea: How to prevent explosion of urea inert scrubber? What is the controlled mass fraction of ammonia?
Theoretically speaking, the gas at the outlet of the inert scrubber is explosive. I think there are some explosion-proof measures:: 1. There should be a certain opening of the medium-pressure regulating valve when driving to prevent detonation energy from being generated when the valve is suddenly opened. 2. Add a dehydrogenation device to reduce explosive gas components. 3. The amount of oxygen added to the system must be strictly controlled. 0.4 is enough for the synthesis tower, and the medium pressure air amount can be controlled at 1.8m³/TUR. 4. The electrostatic grounding and lightning protection devices must be inspected frequently and must be kept intact. 5. A safety inert scrubber can be used. It is said to be automatic explosion-proof and has been adopted by some manufacturers.
I think the explosion-proof principle of the inert scrubber is to use ammonia's relatively narrow explosion limit (15%-27%) and use a relatively high concentration of ammonia (about 60%-70%) to suppress the occurrence of explosions. At the same time, the explosion-proof space of the inert scrubber is relatively large, and part of the explosion energy can be released here. In addition, the presence of high concentration of ammonia in this space can effectively play the role of explosion-proof.
In these two links, there are related discussions for reference. Right now: http://bbs.hcbbs.com/thread-390842-1-5.html (Urea explosion problem), http://bbs.hcbbs.com/viewthread.php?tid=389143 (Relationship between ammonia condenser outlet temperature and explosion)
give you a link: http://bbs.hcbbs.com/thread-101308-1-15.html Other: You can search the forum before posting in the future so that you can ask more targeted questions. :handshake