Improved low-energy-consumption CO2 stripping method urea process
A steam stripping and low energy consumption technology, applied in the field of urea technology, can solve the problems of consumption of circulating water, insufficient energy recovery, and impact on energy saving effect, and achieve the goals of reducing medium pressure steam consumption, increasing synthesis conversion rate, and saving steam consumption Effect
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[0023] Below in conjunction with accompanying drawing, the present invention will be further explained:
[0024] see figure 1 , the urea synthesis solution containing methylammonium coming out from the bottom of the urea synthesis tower, the urea concentration is 33.6%wt, and the temperature is 183°C.
[0025]The urea synthesis solution is divided into two parts, and a part of the urea synthesis solution (55-99wt% of the total amount) is sent to the high-pressure CO decomposition recovery system. 2 High pressure CO in the stripper 101 2 Stripping, high pressure CO 2 The stripping gas discharged from the top of the stripping tower 101 is sent to the high-pressure methylammonium condenser 104 to condense and recover the methylammonium liquid, and discharge the methylammonium liquid and uncondensed process gas. steam to recover heat energy;
[0026] Another part of the urea synthesis liquid (1-45wt% of the total amount) is decompressed and sent to the upper section of the med...
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