Can those urea synthesis processes accept cold ammonia feed?
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Among the various urea synthesis processes, which ones are capable of directly receiving cold ammonia feed?
From the perspective of the urea production process, the reaction needs to take place under high temperature and pressure; therefore, liquid ammonia should be preheated. Does the smaller ammonia stripping unit have preheating? Liquid ammonia at 20-30 degrees is fed directly into the synthesis tower.
Thank you to the friend upstairs. Is there also an ammonia heater in the urea synthesis section?
130,000 tons/year CO2 stripping process: after the ammonia preheater was damaged, liquid ammonia flowed directly in a short circuit to the high-pressure system.
It seems the technique is feasible; thank you
When cold ammonia is used as the feed in the CO2 stripping process, system fluctuations or shutdowns can cause blockages in the liquid at the bottom of the scrubber; therefore, this area is insulated with insulation pipes.
For our 300,000 tons of urea production, we use a carbon dioxide stripping process, with cold ammonia as the feed material, and no preheater is used. Has been in operation for 3 years.
Reply to 7#: The temperature of liquid ammonia, in every drop of it, serves only to maintain the thermal balance of the synthesis tower during the production process. Therefore, different devices have different temperature requirements; even the same device has varying requirements under different loads.
There are several ammonia stripping units in the country that seem to lack ammonia preheaters
A few years ago, the gasket for the ammonia preheater in our unit disappeared at some point; we kept using it, and there doesn’t seem to be much difference now that it’s been replaced
We all have preheaters; what are the disadvantages of using cold ammonia as a feed?