替代燃料在塞内加尔水泥部门的使用：机遇、挑战和解决办法（英文版）_44页-22mb

Summary of the Use of Alternative Fuels in the Cement Sector in Senegal: Opportunities, Challenges and Solutions

Core Content

This report, prepared by the International Finance Corporation (IFC) in collaboration with the Korea Green Growth Partnership, evaluates the opportunities, challenges, and potential solutions for the use of alternative fuels (AF) in the cement sector of Senegal. It is part of a broader assessment across four Sub-Saharan African (SSA) countries: Ethiopia, Kenya, Nigeria, and Senegal. The focus is on the Dakar area, which is a key cement production cluster in West Africa, and the potential to substitute conventional fuels with AF derived from municipal solid waste (MSW), agricultural residue, sewage sludge, waste tires, and used oils.

Main Viewpoints

• Energy Intensity of Cement Production: Cement production is highly energy-intensive, with thermal energy accounting for up to 40% of total production costs. Energy costs represent about 60% of overall production costs.
• Growth in Cement Demand: The demand for cement in SSA is expected to grow by nearly 50% from 2015 to 2020, necessitating new kilns and increased energy efficiency.
• Alternative Fuels as a Solution: AF can significantly reduce reliance on conventional fuels like coal and natural gas, which are expensive and subject to supply risks. Substituting up to 25–30% of thermal energy demand with AF could save up to US$6–7 million annually in fuel costs.
• Technical Potential: In Senegal, the technical potential for AF substitution is estimated at 7.9 million GJ/year, which is nearly 50% of the total energy demand. RDF (Refuse-Derived Fuel) and TDF (Tire-Derived Fuel) show the highest economic potential.
• Challenges: The current waste management system in Senegal is underdeveloped, with poor collection and transport infrastructure and a lack of incentives for private sector participation. These factors hinder the full utilization of AF potential.
• Need for Investment: Establishing material recovery facilities (MRFs) and modifying cement kilns are necessary to process and utilize AF. Total investment required is estimated at up to US$25 million, with a payback period of 3–4 years.
• Policy and Regulatory Gaps: While Senegal has a waste management policy, it lacks specific targets or incentives to promote AF use. Secondary regulations related to payments and contracting are not effectively enforced.
• Global Best Practices: In countries like the EU and the US, AF substitution rates are significantly higher (18–30% and up to 100%, respectively), driven by strong landfill taxes, waste management policies, and Extended Producer Responsibility (EPR) mechanisms.
• Case Study: Poland: Poland has achieved an AF substitution rate of over 60% by implementing high landfill taxes, promoting RDF production, and engaging in EPR and public-private partnerships (PPPs).

Key Information

5.1 Municipal Solid Waste (MSW)

• MSW is a major source of AF in Senegal, with the potential to supply up to 1 million metric tons annually.
• RDF production from MSW requires MRFs, which are not yet fully developed in the country.
• The cost of MSW collection and processing is a key factor in the economic feasibility of AF projects.

5.2 Agricultural Residue

• Agricultural residue is already used by some cement companies in Senegal.
• However, its expansion is challenging due to its dispersed nature across the country.

5.3 Wastewater and Sewage Sludge

• Sewage sludge is not currently produced in sufficient quantities for AF use.
• Infrastructure for dry sludge production is only planned to be developed in 10–15 years.

5.4 Waste Tires

• Waste tires are a promising AF source but require dedicated collection and processing systems.
• TDF (Tire-Derived Fuel) is considered a high-potential AF, with current use limited.

5.5 Used Oils

• Used oils can be converted into fuel, but their availability and processing infrastructure are limited.

6. Waste Management and AF Policies

• Senegal's waste management system is in transition, with a coordinating agency set up for policy and operational management.
• The agency aims to promote PPPs and private investment in waste management.
• Clear waste ownership definitions and enforcement of collection obligations are critical for AF development.

7. Economic Potential

• Substituting 25–30% of thermal energy with AF could reduce fuel costs by up to 10%.
• The total investment required for AF projects is up to US$25 million, with a payback period of 3–4 years.
• RDF and TDF are the most economically viable options due to their availability and lower cost compared to traditional fuels.

8. Conclusion and Recommendations

• A supportive policy environment and efficient waste management system are essential for the successful adoption of AF.
• IFC recommends implementing clear waste ownership definitions, developing MRFs, and promoting PPPs to enable private sector participation.
• Extended Producer Responsibility (EPR) mechanisms should be introduced to incentivize waste collection and processing.
• The report outlines the need for a transparent long-term contracting approach and regulatory improvements to ensure sustainable AF utilization.

Summary of AF Opportunities in Senegal

• AF Streams: MSW (RDF), agricultural residue, sewage sludge, waste tires (TDF), and used oils.
• Technical Potential: 7.9 million GJ/year, equivalent to about 50% of the total energy demand.
• Economic Potential: Up to 25–30% substitution rate, with potential savings of US$6–7 million annually.
• Investment Needs: Up to US$25 million, including US$15 million for kiln modifications and US$10 million for MRF establishment.
• Payback Period: 3–4 years, depending on the sourcing model and fuel mix.
• Key Barriers: Poor waste collection and transport infrastructure, lack of policy incentives, and weak enforcement of regulations.

Annexes and Supporting Data

• The report includes detailed cost scenarios for MSW/RDF sourcing, with two main options.
• Technical and economic parameters are outlined in Annexes 2–4, including assumptions on waste collection, processing, and transportation.
• Global examples of successful AF implementation, such as in Poland and Egypt, are used to highlight best practices and lessons learned.

Conclusion

The use of alternative fuels in the cement sector in Senegal presents significant opportunities for cost reduction, environmental sustainability, and economic growth. However, these opportunities are constrained by current waste management challenges and policy gaps. By developing an enabling environment, investing in infrastructure, and promoting private sector participation, Senegal can unlock the full potential of AF and contribute to its sustainable development goals.