An ejector uses a high-pressure motive fluid to entrain and compress a low-pressure suction fluid. The process relies entirely on the conversion of pressure energy into kinetic energy, and back into pressure energy.
Designing an ejector involves calculating the dimensions of its key components based on thermodynamic and fluid dynamic principles to achieve a desired performance, primarily the entrainment ratio Key Components of an Ejector A standard ejector consists of six main parts: Steam Chest: The inlet for the primary (motive) fluid. Primary Nozzle:
When utilizing an XLS tool to rate an existing ejector, discrepancies between theoretical calculations and field performance often arise due to mechanical or process anomalies. Critical Velocity Failures
To build a reliable, fixed Excel calculator, you must program specific thermodynamic equations. The calculation path relies on the , which dictates the efficiency of the unit. Step 1: Isentropic Expansion of Motive Fluid The ideal velocity ( Vmcap V sub m
The steam expands further, dropping in pressure and accelerating to supersonic velocity (Mach 2 to 4). Entrainment and Mixing
An ejector uses a high-pressure motive fluid to entrain and compress a low-pressure suction fluid. The process relies entirely on the conversion of pressure energy into kinetic energy, and back into pressure energy.
Designing an ejector involves calculating the dimensions of its key components based on thermodynamic and fluid dynamic principles to achieve a desired performance, primarily the entrainment ratio Key Components of an Ejector A standard ejector consists of six main parts: Steam Chest: The inlet for the primary (motive) fluid. Primary Nozzle:
When utilizing an XLS tool to rate an existing ejector, discrepancies between theoretical calculations and field performance often arise due to mechanical or process anomalies. Critical Velocity Failures
To build a reliable, fixed Excel calculator, you must program specific thermodynamic equations. The calculation path relies on the , which dictates the efficiency of the unit. Step 1: Isentropic Expansion of Motive Fluid The ideal velocity ( Vmcap V sub m
The steam expands further, dropping in pressure and accelerating to supersonic velocity (Mach 2 to 4). Entrainment and Mixing
| Property | MGO | LNG | LPG | Methanol | L_NH3 | L_H2 |
|---|---|---|---|---|---|---|
| Flash point [℃] | 52 | -188 | -105 | 11 | 132 | -150 |
| Auto ignition temperature [℃] | 250 | 595 | 459 | 464 | 651 | 535 |
| Boiling point at 1 bar [℃] | 20 | -162 | -42 | 20 | -34 | -253 |
| Low Heating Value [MJ/kg] | 42.7 | 50.0 | 46.0 | 19.9 | 18.6 | 120 |
| Density at 1 bar [kg/m3] | 870 | 470 | 580 | 792 | 682 | 71 |
| Energy density [MJ/L] | 36.6 | 21.2 | 26.7 | 14.9 | 12.7 | 8.5 |
| Fuel tank size | 1.0 | 1.7 | 1.4 | 2.5 | 2.9 | 4.3 |
| Ignition energy [MJ] | 0.23 | 0.28 | 0.25 | 0.14 | 8 | 0.011 |
| Flammable concentration range in the air [%] | 0.6 - 7.5 | 5 - 15 | 2.2 - 9.5 | 5.5 - 44 | 15 - 28 | 4 -75 |
| Property | MGO | LNG | LPG | Methanol | L_NH3 | L_H2 |
|---|---|---|---|---|---|---|
| Flash point [℃] | 52 | -188 | -105 | 11 | 132 | -150 |
| Auto ignition temperature [℃] | 250 | 595 | 459 | 464 | 651 | 535 |
| Boiling point at 1 bar [℃] | 20 | -162 | -42 | 20 | -34 | -253 |
| Low Heating Value [MJ/kg] | 42.7 | 50.0 | 46.0 | 19.9 | 18.6 | 120 |
| Density at 1 bar [kg/m3] | 870 | 470 | 580 | 792 | 682 | 71 |
| Energy density [MJ/L] | 36.6 | 21.2 | 26.7 | 14.9 | 12.7 | 8.5 |
| Fuel tank size | 1.0 | 1.7 | 1.4 | 2.5 | 2.9 | 4.3 |
| Ignition energy [MJ] | 0.23 | 0.28 | 0.25 | 0.14 | 8 | 0.011 |
| Flammable concentration range in the air [%] | 0.6 - 7.5 | 5 - 15 | 2.2 - 9.5 | 5.5 - 44 | 15 - 28 | 4 -75 |