2011年-世界发展银行全球_Energy_Efficient_Inland_Water_Transport_in_Bangladesh_118页_3mb

报告摘要

Summary of "Consulting Services for the Development of More Energy Efficient Inland Water Transport"

Core Content

This report provides an in-depth analysis of the energy efficiency of inland water transport (IWT) and explores technological and operational improvements that can enhance it. It also evaluates the feasibility of a pilot project in Bangladesh to convert vessel engines to Compressed Natural Gas (CNG), aiming to reduce emissions and improve sustainability in the transport sector.

Main Views

IWT is more energy efficient than road and rail transport, emitting less CO₂ per ton-km.
The energy efficiency of IWT is influenced by factors such as fleet structure, vessel and engine age, nautical and market conditions, and commodities being transported.
Conventional methods for improving IWT energy efficiency include optimizing operations, minimizing hull resistance, improving propulsion and steering systems, and adapting waterways.
Technologically advanced methods include the use of alternative fuels (bio-diesel, CNG, LNG, dual fuel, electricity, hydrogen), low-resistance ship design, high-efficiency propulsion systems, and new logistical concepts.
The 'Dutch methodology' is recommended for benchmarking IWT energy efficiency, as it accounts for both well-to-tank and tank-to-wheel emissions, including the entire fuel supply chain.
A pilot project in Bangladesh using CNG for vessel engines is technically and economically feasible, with a positive Net Present Value (NPV) and a short payback period (1.1 years).
The use of CNG requires secure long-term supply and careful installation to maintain vessel stability. It also involves specific infrastructure for loading/unloading, such as fixed quay walls, and monitoring of exhaust emissions to ensure compliance.

Key Information

IWT Energy Efficiency

IWT emits 25–70 g CO₂ per ton-km, compared to 97–110 g CO₂ per ton-km for road and 21–86 g CO₂ per ton-km for rail.
IWT is more fuel-efficient due to its economies of scale, allowing for higher payload per unit of fuel.
Fuel type significantly affects energy efficiency. Diesel has the highest energy content per liter or kilogram compared to other fuels like LNG or electricity.
Pre- and end-haulage by road contributes to CO₂ emissions, which should be accounted for in comprehensive assessments.

Factors Affecting Energy Efficiency

Fuel costs are a key determinant of transport cost and financial attractiveness.
Economies of scale allow IWT to carry more cargo per unit of fuel.
Logistical constraints such as limited fairway networks, water levels, bridge clearances, and port access can hinder IWT.
Intermodal facilities (transshipment from IWT to trucks) are underdeveloped, reducing the attractiveness of IWT for shippers.

Recommended Benchmarking Method

The actual emissions method is preferred for assessing IWT energy efficiency, as it accounts for both exhaust emissions and well-to-wheel emissions (including fuel production and distribution).
It is important to distinguish between sector emissions (exhaust) and fuel chain emissions (well to wheel), as the latter can significantly affect the overall energy efficiency calculation.

Fuel Efficiency Improvement Options

Means	Investment Costs	Cost Savings	Environmental Impact	Safety Impact
Optimizing operations	Low	Low	Low	None
Minimizing resistance	Low to moderate	Low to moderate	Low	Low
Propulsion systems and steering gear	Moderate to high	Moderate to high	Moderate	Low
Adapting fairways	Very high	Potentially very high	Emissions moderate, other aspects vary	Moderate
Alternative fuels	Moderate	Moderate to high	Moderate	Low
Advanced low resistance design	High	High	Moderate	Low
Advanced high-efficiency propulsion systems	Moderate to high	High	High	Low
New logistical concepts	Low to high	Low to high	Low to moderate	None

Pilot Project in Bangladesh

The pilot project involves retrofitting a passenger vessel with a dual fuel engine system and CNG tanks.
Investment costs are estimated at USD 43,000, with a positive NPV of USD 145,000.
Fuel cost savings are significant, especially when comparing CNG to petro-diesel.
The economic price difference between CNG and petro-diesel is notable, with fuel cost savings potentially reaching USD 1.93 per ton-km.
The CO₂ emissions per ton vary depending on the fuel type and operational conditions, with CNG showing lower emissions than diesel.

Challenges and Considerations

CNG supply security is crucial for the sustainability and scalability of the project.
Vessel stability must be ensured during CNG tank installation and loading/unloading.
Exhaust emissions need to be monitored closely to prevent exceeding diesel levels.
Intermodal integration is necessary for IWT to become more competitive with road transport.

Conclusion

Improving the energy efficiency of inland water transport is essential for reducing greenhouse gas emissions and enhancing cost competitiveness. The report emphasizes the importance of technological innovation, operational optimization, and policy support in achieving these goals. The pilot project in Bangladesh using CNG represents a viable and beneficial approach, offering significant cost and emission savings. However, its successful implementation requires secure fuel supply, adequate infrastructure, and careful planning to ensure safety and efficiency.