工业过程用太阳能技术简介（英文版）_38页_5mb

Summary of Solar Heat for Industrial Processes

Core Content

Solar thermal energy has significant potential to supply heat for industrial and agricultural processes globally. It can provide a substantial portion of industrial heat demand, particularly in developing countries where it is used for drying, curing, washing, boiling, pasteurisation, and sterilisation. In developed economies, solar thermal can supply up to half of the energy required for industrial heating, especially for hot water and steam applications.

Main Technologies and Applications

There are three primary types of solar thermal technologies used for industrial process heat:

• Solar Air Collectors: Used mainly in the food processing industry for drying, reducing spoilage, and improving product quality. They are often locally manufactured and cost-effective.
• Solar Water Systems: Include flat-plate collectors (FPC) and evacuated tube collectors (ETC), which are suitable for heating up to 125°C. They are widely used in residential and industrial settings, with lower costs in countries like India, China, and Brazil.
• Solar Concentrators: Such as parabolic dish, parabolic trough, and Linear Fresnel collectors, capable of producing temperatures up to 400°C. These are used for more demanding applications like steam generation.

Key Application Areas

• Food and Beverage Industry: Drying, washing, pasteurisation, boiling, sterilisation.
• Textile Industry: Dyeing, washing.
• Paper and Pulp Industry: Cooking, drying, bleaching.
• Transport Equipment: Drying, curing.
• Machinery and Chemical Industries: Medium-temperature processes.
• Thermally Driven Desalination: Up to 110°C for heating.

Main Views and Key Information

Deployment and Economic Factors

• Deployment levels are heavily influenced by economic competitiveness and the payback period.
• Solar thermal systems typically have short payback times (<3 years), but fossil fuel prices and integration complexities hinder adoption.
• For small- and medium-sized enterprises (SMEs), upfront costs and lack of finance are key barriers.

Technical Potential and Challenges

• Solar thermal can potentially fulfill up to 50% of industrial heat demand, especially for low- to medium-temperature applications.
• Most industrial heat is required in large, complex plants, where integration into existing systems is challenging.
• Solar process heat systems often require storage or advanced control systems to manage non-continuous solar energy supply.

Cost and Performance

• Conventional FPC and ETC costs range from EUR 250-1000/kW in Europe and EUR 200-300/kW in India, Turkey, South Africa, and Mexico.
• Concentrated systems (parabolic dish, trough, Linear Fresnel) have higher costs but can reach up to 400°C.
• Solar thermal cooling systems are also viable, especially for industries requiring air conditioning or refrigeration, with systems ranging from small-scale to large-scale.

Market and Regional Potential

• Solar thermal is most viable in regions with high solar irradiance, such as India, Mexico, and the Middle East.
• In India, over 80 parabolic dish collectors are used for community cooking, and the largest projects are concentrated in the copper mining sector.
• The market for solar thermal systems is growing, with increasing interest in hybrid systems and integration into industrial processes.

Barriers and Opportunities

Barriers

• High upfront costs for SMEs.
• Lack of awareness and familiarity with solar thermal technology.
• Integration complexities into existing industrial systems.
• Volatility and high costs of fossil fuels.
• Limited storage and control capabilities for non-continuous solar energy.

Opportunities

• Integration into new industrial plants.
• Use of local manufacturing to reduce costs.
• Support from research and government subsidies.
• Potential to replace fossil fuel subsidies with solar thermal support.
• Growing use of solar thermal for both heating and cooling in various industrial sectors.

Conclusion

Solar thermal technologies are a viable and sustainable alternative for industrial process heat and cooling. While challenges such as high initial costs and integration complexities exist, the long-term economic and environmental benefits make it a promising option. Policy support, awareness campaigns, and local manufacturing are essential for increasing market penetration and ensuring widespread adoption.