Existing plants for producing liquid ammonia and ammonium carbonate from semi-water gas wish to add a urea production line
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A conversion from the production of semi-water gas to liquid ammonia and ammonium carbonate already exists; what changes need to be made to the production process in order to add a urea production line? Thank you
Not much of a change. Our plant has been converted from producing ammonium carbonate to producing urea. 1. The previous decarbonization system ； 2. The previous urea system ； 3. If possible, modify the compressor cylinder block (this is mainly due to the fact that in the original ammonium carbonate process, the compression takes place in the second stage of the compressor, while the decarburization system is typically designed for the fourth stage; thus, the cylinder of the third compression stage will become a bottleneck in future production). The original poster could also inquire to see if those products are also produced by converting ammonium carbonate into urea.
Just one set of urea production system is sufficient. By the way, what is the annual output of your ammonia synthesis system? A corresponding urea production system is needed for that
Facilities for producing liquid ammonia and carbamide generally do not have very large capacities. When switching to the production of urea, it is not possible to increase the scale; moreover, the approval procedures are quite complicated. It seems that facilities with a capacity of less than 300,000 tons are no longer approved, and it is not possible to obtain a production license for such facilities.
I think that once urea production is in use, carbon ammonium should no longer be produced; in that case, \"complete decarburization\" of the shift gas is necessary. PSA in two stages can be used for decarburization – the CO2 from the first stage is used in urea synthesis, while the CO2 from the second stage is vented； The newly installed equipment includes: 1. One set of two-stage VPSA decarburization unit (adsorption towers, vacuum pumps, etc.) ； 2. One set of improved CO2 stripping-based urea synthesis equipment (urea synthesis tower, CO2 stripping tower, CO2 compressor, high-pressure ammonia pump, etc.): 3. One set of equipment for producing large-grained urea ； 4. One urea finished product packaging line.
With such outdated and small-scale equipment, what kind of urea can it possibly produce? It cannot keep up with the pace of progress; just look at the situation of urea production in our country to see this.
Our company initially produced methanol on a combined basis, and later also produced sodium formate in that same combined process
The urea market has improved, but some manufacturers are once again becoming enthusiastic about producing urea; however, there is an excess supply of over 30%, so the market situation is not likely to improve in the future. It would be better to use ammonia, carbon dioxide, hydrogen, and other substances to produce other products instead.
I agree with the view expressed above by Xi Shui: given the current size of the urea market and its production capacity, it makes little sense to produce smaller amounts of urea.