Regarding the issue of the amount of circulating hydrogen
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What are the reasons for the low flow rate of hydrogen in the hydrocracking cycle? Is it related to the system pressure or the degree of reaction? The speed of the circulation pump in the plant is already quite high; so it shouldn’t be a problem related to the pump speed. Please advise!!
I am involved in restructuring, and our hydrogen cycle is related to the depth of the reaction.
An increased reaction depth leads to higher hydrogen consumption in the system, which results in a drop in system pressure. A decrease in the pressure at the compressor inlet causes a reduction in the amount of air being pumped in.
Check the system pressure difference. If the system pressure difference increases, there may be a blockage in the piping, and it is likely to be caused by ammonium salts. This incident has occurred before with my device.
Is the system pressure drop very high? Check whether the reactor and high-pressure heat exchangers have coking; also see if the pressure difference between the inlet and outlet of the cyclohexane compressor in your plant is higher than before What is the amount of new hydrogen being added? A low amount of new hydrogen added can also result in a low volume of circulating hydrogen.