Technology Unit
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- Carbamate Condenser
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- Toyo ACES 21
- Short Name
- VSCC
- Description
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The stripped off Gas from the Stripper is fed to the Vertical Submerged Carbamate Condenser (VSCC).
The VSCC in ACES21® has functions to condense NH3 and CO2 gas mixture from the Stripper to form Ammonium Carbamate in the Shell Side, synthesize Urea by Behydration of Ammonium Carbamate in the Shell Side and remove the Reaction Heat of Ammonium Carbamate Formation by generating 5 barG Steam in Boiler Tubes.
VSCC is operated at N/C ratio of 2.8 – 3.0 where the equilibrium vapor pressure of Urea-Carbamate Solution gives the lowest. This optimum N/C selection allows VSCC to be operated at high temperature under relatively low Synthesis pressure, rendering efficient heat transfer between the Shell and the Tube and a higher Reaction rate of Ammonium Carbamate Dehydration simultaneously. The reactor N/C ratio is selected at 3.7 to maximize CO2 conversion with appropriate excess pressure to that of equilibrium. Resultantly, high CO2 Conversion is achieved in the Reactor at relatively low temperature and pressure.
Advantages of the Vertical Submerged Configuration of Carbamate Condenser are:
- High Gas velocity, appropriate Gas hold up and sufficient Liquid depth in the Bubble Column promote mass and heat transfer;
- An appropriate number of Baffle Plates distributes Gas Bubbles in the Volumn effectively without pressure loss; and
- A vertical design inevitably requires a smaller plot area.
- Link
System Info
- Updated by
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Kokel, Nicolas - Updated
- 5/7/2023 4:28 AM
- Added
- 5/7/2023 4:18 AM
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