| Appendix 5.1b - Calculation of Emission
Factors for Marine Vessels |
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| According
to Table 3.1-1, AP42, 5th edition for uncontrolled diesel-fired gas tubines |
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| Pollutant |
Emissions
(lb/MMBtu) |
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| NOx |
8.80E-01 |
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| Note: |
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| To
convert lb/MMBtu to lb/103 gallons, multiply by 139 |
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| To
convert lb/103
gallons to kg/103 L, multiply by 0.12 |
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| According
to Analysis of Commercial Marine Vessels Emissions and Fuel Consumption Data: |
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| Emissions(mode) = emission factor of
NO2 x Load
Factor(mode) x
Engine Power (kW) x Time(mode) |
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| EF of NO2 (g/kW-hr) = |
7.59E-01 |
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| EF of NO2/ferry (g/s) = |
2.20E+00 |
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| Fuel consumption1 (L/hr) |
2.70E+03 |
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| Load Factor2, LF(idling)(%) = |
10 |
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| Load Factor2, LF(travelling)(%) = |
100 |
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| Power of vessel1 (kW) = |
10440 |
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| For Idling |
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| Type of Ferry |
No.of movement3 |
No.of movement3 |
No. of ferry |
No. of ferry |
Time(Idling)(min) |
NO2 (g/s) |
NO2 (g/s) |
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per day |
per night |
per hr (daytime4) |
per hr (night time4) |
per ferry |
daytime |
night time |
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| A |
82 |
40 |
4 |
3 |
20 |
2.936E-01 |
2.202E-01 |
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| B |
22 |
10 |
1 |
2 |
20 |
7.339E-02 |
1.468E-01 |
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| Notes: |
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| A:
Traveling between MFT and Macau |
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| B:
Traveling between MFT and Mainland China |
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| 1 As a worst-case
scenario, TriCat (Caterpillat Solar Taurus gas turbine), which has the
greatest engine power of 2 x 5220kW, was assumed in the assessment. |
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| 2 Based on the Analysis
of Commercial Marine Vessels Emissions and Fuel Consumption Data from USEPA,
the load factor of passenger vessel in idling mode was 10%, and ferry during
travelling was assumed full load. |
| 3 1 ferry consists of 2
movements |
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| 4 Sailing Schedule: |
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| Type A: 07:00-19:00(daytime),
19:01-02:30(night time) |
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| Type B: 07:00-19:00(daytime),
19:01-21:30(night time) |
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