The function of a HP scrubber is to reduce the ammonia content in the inert stream coming from the high pressure synthesis section by washing the inert stream with the recycle carbamate and cooling it against cooling water. This discussion helped to find the root cause of problem when the temperature in the top of the HP scrubber increased unexpectedly.
In all urea plants, high pressure pumps are used to pump the feedstock ammonia and carbon dioxide to the high pressure synthesis section and in most urea plants carbamate liquid is recycled from the recirculation section to the synthesis. Reciprocating pumps are used for these services and sometimes vibration problems occur in the discharge pipeline. This discussion considers the possible causes and solutions to problem.
A discussion on what measures can be taken to unblock pipelines and heat exchangers after a urea plant shutdown.
Sometimes a serious problem occurs in a urea plant, which forces the plant to reduce capacity or even forces a shutdown. It is then vital to find the root cause of the problem as soon as possible, especially if the problem repeats. Such a situation happened at Khorasan Petrochemical Company in Iran which experienced a problem with the high pressure scrubber.
Possible causes and solutions to the problem of high CO2 content in the liquid outlet of a high pressure SO2 stripper in a urea plant are discussed.
In several sections of a urea plant, pipelines can become easily blocked when temperatures become too low and during a shutdown of the plant blocking can occur if the right measures are not taken.
The urea melt pump is a challenging application of a centrifugal type of pump. Urea polymer lumps falling in the melt pump suction line can cause cavitation of the pump and even damage the pump shaft.
The nozzles used in urea fluid bed granulation form the most essential part of a fluid bed granulation plant. This discussion looks at the problem of nozzle choking, the causes and solutions.