[Urea knowledge] Daily question (48) 2010.02.06.

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My colleagues parted ways today. I didn’t send it out before 5 o’clock for fear of missing something. Now I’m finally back and finished! :) Hide the answer. If you don’t hide it, you will not be graded in principle. Specific hiding methods: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 true or false question: 1. Both H2 and CH4 in the air released from the medium pressure system are explosive. ( ) 2. The higher the decomposition temperature, the more complete the decomposition of NH3 and CO2. ( ) 3. Desorption in urea production is mainly to recover a small amount of urea extracted by the evaporation system. ( ) 4. The gas recovered from the urea medium and low pressure systems will return to the high pressure system. ( ) 5. The function of the baffle in the urea hydrolyzer is to increase the residence time. ( ) 1. Both H2 and CH4 in the air vented from the medium-pressure system are explosive. (V) 2. The higher the decomposition temperature, the more complete the decomposition of NH3 and CO2. (V) 3. Desorption in urea production is mainly to recover a small amount of urea extracted by the evaporation system. (X) 4. The gas recovered from the urea medium and low pressure systems will return to the high pressure system. (V) 5. The function of the baffle in the urea hydrolyzer is to increase the residence time. (X)