Early detection of clogging of air feed pipes into urea granulation reactor

摘要

o detect the clogging of the air feed pipes 13 through which air is jetted into a urea granulator to cause granulation of molten urea jetted into the granulator via pipe 12 and outlets 3, the pressures upstream and downstream of the air pipe orifices 14 are measured by respective transducers 17 and 16 as orifice rear pressure and orifice forward pressure. The pressure difference between the orifice forward and rear pressures is monitored to detect clogging of the air feed pipes based on a change or abnormality in the pressure difference.