Improved low-energy-consumption CO2 stripping method urea process

According to the technical scheme, urea synthesis liquid is divided into two parts, one part of urea synthesis liquid is fed into a high-pressure CO2 stripping tower in a high-pressure decomposition and recovery system to be subjected to high-pressure CO2 stripping, and the other part of urea synthesis liquid is fed into a high-pressure CO2 stripping tower in a high-pressure decomposition and recovery system to be subjected to high-pressure CO2 stripping; the other part of the urea synthesis liquid is fed into a medium-pressure decomposition tower of the medium-pressure decomposition recovery system for medium-pressure decomposition, and a medium-pressure gas phase and a medium-pressure decomposition liquid phase are obtained. High-pressure stripping liquid flowing out of the bottom of the high-pressure CO2 stripping tower and the other part of urea synthesis liquid are decompressed and then are respectively fed into the middle section and the upper section of a medium-pressure decomposition tower for medium-