Regenerative Energie
AVE runs two lines of waste to energy plants with a capacity of 300,000 tons of municipal waste per year nearby the community of Wels and it is also allowed to burn 10 % of sewage sludge. Increasing the sewage sludge input into the waste to energy plants is one of the most critical adjustments running WAV II. The content of organic carbon is rising proportionally with the amount of sewage sludge. To reduce this effect, a system to change the water of the wet slag extractor was installed. The reference value is the total organic carbon (TOC), which is limited by the "threshold in the landfill ordinance". The extracted water will be injected into the burning chamber of line II.
Slag, produced by WAV I and WAV II will be deposited into the landfill area called "Schießstätte" in Wels, nearby the plants. TOC content of the slag is characterized of contamination of water in the wet slag extractors from sewage sludge and is limiting the injection into line II.
Sewage sludge, stabilized by polymers, will be pumped out from storage vessel combined with a piston pump system and is dosing portions of sludge into the chute. It moves via the moving grate to the descending grate. Municipal waste is normally reduced to ash and slag at the end of the grate. Compact portions of sludge are still carrying organic carbon. Especially this phenomenon is documented in line II.
Heat and the slag itself cause lack of water in the wet slag extractor. So water has to be replaced. On the other side surplus water is passes the overflow. Now the water will be changed by flow control continuously and pumped to a 30 m² storage tank, which collects water from line I and II. The tank is equipped with a circulation pump and also strainers. Two redundant discharge pumps bring the sewage water to the 8 secondary air injection nozzles, which are modified with some water injectors. The water injectors can be used separately and each of them has a flow control system. For start up and shut down, the water injectors can be blown dry. Experiences since 2009 shows, that the optimized injection is directed to the center of the grate not to cause any damages at the burning chamber. Effects of the injection are increased amount of flue gas and also increasing temperature of the scrubbers.
But the summary effects of the injection-projects can be seen at the draught fan (increasing amount of flue gas) and the higher flexibility of input material.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben |
| Quelle: | Depotech 2012 (November 2012) |
| Seiten: | 4 |
| Preis: | € 2,00 |
| Autor: | G. Madlsperger Andreas Freimund |
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