Questions regarding the adjustment of the 8-2-3PSA system and relevant precautions
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Hello, teachers! We have added an 8-2-3 PSA system with a capacity of 8,000 m3/h for hydrogen production using coke oven gas; this system consists of 8 adsorption towers, 1 crude hydrogen tank, and 2 desorbed gas buffer tanks. At the beginning of operation, a flash explosion occurred inside the adsorption tower during reverse operation; however, oxygen levels measured at the PSA inlet were all below 0.2%, whereas the design value is 0.4%. I would like to ask the teachers: what oxygen content in the PSA system is sufficient to cause a flash explosion? The backpressure is 0.3 Mpa; is it possible to reduce this backpressure during the adjustment process? For the 8-2-3PSA system, what should be taken into consideration when adjusting the T1~T4 times? Thank you!
Since a flash explosion occurred, there must have been oxygen present; it’s possible that the displacement process was not carried out properly. There is no need to reduce the pressure; the adjustment of time should be based on the desired purity of hydrogen
The flash explosion may be caused by static electricity; COG itself contains oxygen, but in very low amounts. There are four elements of an explosion.