Can any body explain in detail why CO conversion in Ammonia synthesis plant is done 02 steps High temperature and Low temperature shift converter with different catalyst??
Thanks in advance
|
Posted 09 August 2017 - 10:41 AM
Can any body explain in detail why CO conversion in Ammonia synthesis plant is done 02 steps High temperature and Low temperature shift converter with different catalyst??
Thanks in advance
Posted 09 August 2017 - 11:22 AM
Posted 09 August 2017 - 08:51 PM
Several reasons.
1) For low temperature shift if the CO level in the inlet is high, the exit temperature will be also high (is an exothermic reaction) and you will have higher unconverted CO. So the bulk of the conversion is done before you get to the lower temperature. Any unreacted CO has to be later methanated with an impact on Hydrogen and synthesis loop purge (unless you have a separation unit and remove Argon and Methane before)
2) You always want to recover heat at the higher possible temperature for thermodynamic efficiency. So converting in the HDS is better since you get the exotherm at high temperature.
3) Low temperaure shift catalyst is more expensive than HDS. Also more sensitive to temperature.
Caloric Temperature CalculationStarted by Guest_bckesim_* , 10 Apr 2024 |
|
|
||
Flow Switch High RangeStarted by Guest_Lyne_* , 11 Apr 2024 |
|
|
||
Coefficient Of Conversion Of Electrical Energy Into Thermal Energy ForStarted by Guest_amx_* , 03 Apr 2024 |
|
|
||
Heat Exchanger Temperature CrossStarted by Guest_kaidlut_* , 20 Dec 2022 |
|
|
||
Temperature Cross Heat ExchangerStarted by Guest_Priolo_* , 12 Aug 2019 |
|
|