Regenerative Energie
At present, in ten coal-fired power plants in Germany solid recovered fuels from mixed municipal waste and production-specific commercial waste are co-combusted and experiments have been conducted at other locations. Altogether, in 2010 about 800,000 tons of these solid recovered fuels were used. In the coming years up to 2014 a slight decline in the quantity of materials used in co-combustions is expected.
The co-combustion activities are to some extent significantly influenced by increasing power supply from renewable energy sources and their impact on the regime of coal-fired power plants usage. Moreover, price trends of CO2 allowances, solid recovered fuels as well as imported coal also have significant influence. Aside from the usage of solid recovered fuels with biogenic con-tent, the co-combustion of pure renewable biofuels has become more important in coal-fired power plants.
The power plant operators make high demands on the quality of solid recovered fuels. The individual requirement profiles concerning the solid recovered fuels to be co-combusted include chemical, mechanical, calorific and other properties.
As the operational experience shows, a set of problems may be posed by co-combustion:
- Incomplete burnout,
- Chlorine corrosion,
- HCl emission - Retrofitting of emission control requirements at CFB plants,
- Fouling and slagging of the boiler heating surfaces,
- Increased chloride load of the flue gas desulfurization and FGD products,
- Problems with discharging, conveying and dosing,
- Mechanical problems due to metallic contaminants,
- Chemical and thermal problems due to aluminum in CFB boilers,
- Erosion of boiler and
- Exceeding the capacity of the ash discharge systems.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben |
| Quelle: | Depotech 2012 (November 2012) |
| Seiten: | 6 |
| Preis: | € 3,00 |
| Autor: | Dr.-Ing. Stephanie Thiel |
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