May I ask about the control of the pressure in the low-pressure steam drum?
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May I ask, in the CO2 stripping process for urea production (the process that does not use a pool-type condenser), when ammonia is introduced into the empty tower (what is referred to in the industry as the initial startup phase), what parameters are used to reduce the pressure of the steam in the low-pressure drum (that is, to lower it from 0.55 MPA)? What is the reason for this? Thank you.
The appropriate time is after the output from the synthesis tower and once the stripping tower is operational; at that point, the pressure in the low-pressure steam vessel can be gradually reduced. The reasons are as follows: 1. The amount of gas in the system has **increased at this stage, so an explosion in 203-C is less likely to occur. 2. At this time, the system pressure rises rapidly; by reducing the steam pressure, it becomes easier to control the system pressure. ...
This post was last edited by 1025199692 on 2010-4-14 06:37. I agree with the view expressed above (although it’s not entirely comprehensive); regarding this process, many people (or organizations) hold different opinions and employ various approaches. It seems that Stamicarbon has been used in China for decades yet the replication technology remains unclear.