Table 1. Oxygen specification for power generation system.
Power Generation System | Output [kW] |
Oxygen flow rate [Nm3/h] |
Pressure [MPa] | Purity [%O2] | |
Case1 |
Monatomic Gas Circulation type Hydrogen Diesel |
610 | 214 | 0.131 | ≧ 97.0 |
Case2 | Steam Circulation type Diesel | 1044 | 532 | 0.592 | ≧ 95.0 |
Case3 |
Solid Polymer Electrolyte type Fuel Cell |
5000 | 1651 | 0.984 | ≧ 96.0 |
Table 2. Comparison of specific power consumption of oxygen
Conventional Process | Hydrogen Utilized | ||
Single-column | Double-column | ||
Main Air Comp. Flow rate [Nm3/h] Outlet press. [MPa] Power [kW] |
7960 0.58 657 |
8505 0.32 459 |
7970 0.33 445 |
Recycle Nitrogen Comp. Flow rate [Nm3/h] Outlet press. [MPa] Power [kW] |
− |
1703 0.58 54 |
− |
Regenerating Heater Flow rate [Nm3/h] Power [kW] |
1592 9 |
4763 31 |
4464 26 |
Total power [kW] | 666 | 544 | 471 |
Oxygen Production Flow rate [Nm3/h] (100%O2 equiv.) pressure [MPa] purity [%] |
1720 (1651) 0.127 96.0 |
1720 (1651) 0.137 96.0 |
1720 (1651) 0.137 96.0 |
Power consumption [kWh/Nm3] |
0.403 | 0.330 | 0.286 |
Table 3. Comparison of specific power consumption
including oxygen compression power
Conventional Process | Double-column Process Hydrogen Utilized | |
Main Air Comp. Flow rate [Nm3/h] Outlet press.[MPa] Power [kW] |
7960 0.58 657 |
7970 0.34 455 |
Regenerating Heater Flow rate [Nm3/h] Power [kW] |
1592 9 |
4464 24 |
Low Temp. Air Comp. Flow rate [Nm3/h] Outlet press. [MPa] Power [kW] |
− |
990 2.46 47 |
Oxygen Comp. Flow rate [Nm3/h] Outlet press.[MPa] Power[kW] |
1720 1.08 240 |
− |
Liquid Oxygen Pump Flow rate [Nm3/h] Outlet press. [MPa] Power [kW] |
− |
1720 1.10 1 |
Total power [kW] | 906 | 527 |
Power consumption [kWh/Nm3] |
0.552 | 0.319 |
Table 4. Rate of utilized hydrogen cold energy
Unit |
Range of hydrogen temp. [K] | Rate of utilized hydrogen cold energy to the total supply [%] | Rate of utilized hydrogen cold energy for each unit [%] |
Nitrogen Condenser | 23〜78 | 27.0 | 60.1 |
Sub-cooler | 78〜94 | 4.5 | 10.0 |
Main Heat Exchanger | 94〜137 | 13.4 | 29.9 |
Not utilized | 137〜293 | 55.1 | − |
Total | 100 | 100 |
Fig. 1. Conventional process
Fig. 2. Single-column process utilizing hydrogen
Fig. 3. Double-column process utilizing hydrogen
Fig. 4. Double-column process utilizing hydrogen
for producing high pressure oxygen