Patent ID: 11878957
Assignee: TOYO ENGINEERING CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC C

Claim 18:
19. The apparatus for urea production according to claim 13, comprising:
a purification apparatus configured to, by heating, at a pressure lower than the pressure in the high-pressure decomposer and higher than atmospheric pressure, the urea synthesis solution after being processed by the high-pressure decomposer to generate a gas phase and a liquid phase, and by separating the gas phase, obtain a urea synthesis solution having an increased urea concentration and generate a low-pressure steam condensate, a part of the low-pressure steam generated by the condenser being used as a heat source for heating the urea synthesis solution after being processed by the high-pressure decomposer;
a concentration apparatus configured to, by heating, at a pressure lower than the pressure in the purification apparatus and equal to or lower than the atmospheric pressure, the urea synthesis solution after being processed by the purification apparatus to generate a gas phase and a liquid phase, and by separating the gas phase, obtain a urea synthesis solution having a further increased urea concentration and generate a low-pressure steam condensate, another part of the low-pressure steam generated by the condenser being used as a heat source for heating the urea synthesis solution after being processed by the purification apparatus; and
a granulating apparatus configured to produce granular solid urea, with use of air, from the urea synthesis solution after being processed by the concentration apparatus, wherein
the first heat exchange structure is configured to use, as said another fluid, the air to be supplied to the granulating apparatus.