| 摘要 |
The present invention provides a method and a device capable of producing urea more efficiently. In the present invention, prior to removing unreacted materials from a urea synthesis solution obtained from a stripper, the pressure of the urea synthesis solution is decreased from the synthesis pressure, and the obtained gas-liquid mixture, once heated by a decomposition gas from the stripper, is introduced into a purification system. The heating of the gas-liquid mixture by the decomposition gas is carried out using a shell-and-tube heat exchanger, the decomposition gas being introduced on the tube side while introducing the gas-liquid mixture on the shell side. |
