Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation
Abstract
:1. Introduction
2. Process Flow and Low-Duty Turbo Compressor Description
3. Measuring Equipment and Measured Results
4. Energy and Exergy Analysis of the Low-Duty Turbo Compressor
5. Low-Duty Turbo Compressor Isentropic, Energy, and Exergy Analysis
6. Low-Duty Turbo Compressor Mass Flow and Tank Equilibrium Pressure Maintained during a Voyage
7. Conclusions
Author Contributions
Funding
Conflicts of Interest
Abbreviations
Latin symbols | |
e | induced EMF, V |
Ėl | energy rate loss, kW |
EMFmax | maximum induced electro motor force, V |
ex | specific exergy, kJ/kg |
Ėxd | exergy destruction rate, kW |
f | frequency, Hz |
g | gravitational acceleration, m/s2 |
h | specific enthalpy, kJ/kg |
I | amperage, A |
ṁ | mass flow rate, kg/h |
p | pressure, MPa |
P | power, kW |
R | specific gas constant, kJ/kgK |
Q˙ | heat flow rate, kW |
Ṡ | entropy rate, kW/K |
t | time, s |
T | temperature, K |
U | voltage, V |
ṽ | speed, m/s |
v | specific volume, m3/kg |
V | volume, m3 |
z | height, m |
Z | compressibility factor |
Greek symbols | |
η | efficiency, % |
ηIS | isentropic efficiency, % |
ηI | energy efficiency, % |
ηII | exergy efficiency, % |
φ | power factor |
ω | angular velocity, rad/s |
θ | angle from reference, radians |
Abbreviations | |
AC | Alternating current |
C | Compressor |
EMF | electro motor force |
HFO | heavy fuel oil |
LNG | liquefied natural gas |
rpm | revolutions per minute |
Subscripts | |
BOG | boil off gas |
CA | compressor actual compressing process |
EM | electric motor |
IS | isentropic |
IN | input |
ME | mechanic |
OUT | output |
m | mixture |
i | mixture component |
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Parameter. | Unit | Natural Gas Type 1 | Natural Gas Type 2 |
---|---|---|---|
Molecular weight | kg/kmol | 18.64 | 18.44 |
Flow | Nm3/h | 8500 | 4000 |
Inlet pressure | kPa | 103 | 103 |
Inlet temperature | °C | −40 | −140 |
Outlet pressure | kPa | 200 | 200 |
Shaft speed | rpm | 24,000 | 17,000 |
Isentropic efficiency | % | 77% | - |
Main Propulsion Shaft Speed (rpm) | Gas Temperature (°C) | Gas Pressure in (MPa) | Gas Temperature Out (°C) | Gas Pressure Out (MPa) | Mass Flow (kg/h) |
---|---|---|---|---|---|
25.6 | −70 | 0.1097 | −55 | 0.1260 | 3332 |
34.3 | −69 | 0.1096 | −55 | 0.1261 | 3346 |
41.8 | −72 | 0.1098 | −57 | 0.1255 | 3285 |
53.5 | −72 | 0.1094 | −57 | 0.1370 | 3942 |
61.5 | −89 | 0.1110 | −75 | 0.1274 | 4270 |
63.6 | −89 | 0.1111 | −75 | 0.1290 | 4453 |
65.1 | −90 | 0.1108 | −75 | 0.1312 | 4619 |
66.1 | −90 | 0.1106 | −76 | 0.1328 | 4792 |
67.7 | −91 | 0.1104 | −76 | 0.1350 | 4849 |
68.7 | −92 | 0.1102 | −77 | 0.1364 | 5120 |
69.5 | −92 | 0.1099 | −77 | 0.1373 | 5207 |
70.4 | −93 | 0.1098 | −77 | 0.1392 | 5295 |
71.0 | −93 | 0.1099 | −77 | 0.1397 | 5210 |
73.1 | −95 | 0.1094 | −76 | 0.1461 | 5559 |
74.6 | −96 | 0.1089 | −76 | 0.1503 | 5922 |
76.6 | −97 | 0.1084 | −74 | 0.1657 | 6324 |
78.4 | −98 | 0.1079 | −73 | 0.1628 | 6526 |
79.5 | −100 | 0.1078 | −73 | 0.1670 | 6773 |
80.4 | −101 | 0.1075 | −73 | 0.1718 | 6941 |
81.5 | −102 | 0.1074 | −73 | 0.1730 | 6868 |
82.9 | −104 | 0.1071 | −74 | 0.1777 | 7057 |
83.0 | −105 | 0.1071 | −74 | 0.1783 | 7103 |
Main Propulsion Shaft Speed (rpm) | Amperage (A) | Frequency (Hz) | Electric Motor Speed (rpm) | Low-Duty Turbo Compressor Speed (rpm) |
---|---|---|---|---|
25.6 | 311 | 29.8 | 1790 | 11,983 |
34.3 | 311 | 29.8 | 1789 | 11,977 |
41.8 | 311 | 29.8 | 1791 | 11,990 |
53.5 | 323 | 30.7 | 1843 | 12,338 |
61.5 | 315 | 29.8 | 1790 | 11,983 |
63.6 | 316 | 29.8 | 1790 | 11,983 |
65.1 | 319 | 29.8 | 1790 | 11,983 |
66.1 | 320 | 29.8 | 1790 | 11,983 |
67.7 | 322 | 29.8 | 1790 | 11,983 |
68.7 | 324 | 29.8 | 1790 | 11,983 |
69.5 | 326 | 29.8 | 1791 | 11,990 |
70.4 | 329 | 30.3 | 1816 | 12,157 |
71.0 | 330 | 30.3 | 1817 | 12,164 |
73.1 | 340 | 32.9 | 1976 | 13,229 |
74.6 | 349 | 35.0 | 2099 | 14,052 |
76.6 | 363 | 37.5 | 2249 | 15,056 |
78.4 | 371 | 39.6 | 2373 | 15,886 |
79.5 | 375 | 40.6 | 2435 | 16,301 |
80.4 | 386 | 42.1 | 2523 | 16,890 |
81.5 | 388 | 42.2 | 2532 | 16,951 |
82.9 | 395 | 43.4 | 2602 | 17,419 |
83.0 | 396 | 43.2 | 2594 | 17,366 |
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Poljak, I.; Glavan, I.; Orović, J.; Mrzljak, V. Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation. Appl. Sci. 2020, 10, 3373. https://doi.org/10.3390/app10103373
Poljak I, Glavan I, Orović J, Mrzljak V. Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation. Applied Sciences. 2020; 10(10):3373. https://doi.org/10.3390/app10103373
Chicago/Turabian StylePoljak, Igor, Ivica Glavan, Josip Orović, and Vedran Mrzljak. 2020. "Three Approaches to Low-Duty Turbo Compressor Efficiency Exploitation Evaluation" Applied Sciences 10, no. 10: 3373. https://doi.org/10.3390/app10103373