48 MAKALE / ARTICLE There is huge market potential in tropical countries, which have enormous biomass sources suitable for energy production. But the less-developed countries cannot provide similar subsidy structures as the richer EU and this tends to limit the development of these markets. This method - which requires no fuel pro-drying or support fuel - provides a stable, constant combustion process for fuels with moisture content of up to 65 %. Furthermore, after-burning time and temperature can be very accurately adjusted. This patented technology allows a variety of biofuels to be used. New technology from Wartsila üne drawback to the advance of smaller-scale biopower has been the problem of combusting The combustion gases from the primary combustion chamber flow into the secondary combustion chamber to ensure the thoroughly wet and even icy fuels in periods of cold weather such as is experienced in the Nordic countries during winter. Sermet Oy has worked on this challenge since the early 1 990s, and the first 4 MWth installation using advanced BioGrate Technology commenced operation in 1 994 at a Finnish sawmi l l . Currently, the two main customer One drawback to the advance of smaller-sca/e biopower has been the problem of combusting thoroughly wet and even icy fue/s in periods of co/d weather such as is experienced in the Nordic countries during winter. Sermet Oy has worked on this challenge since the early 1990s, and the first 4 MWth installation using advanced BioGrate technology commenced operation in 1994 ata Finnish sawmi/1. groups for BioGrate technology are Nordic highest possible temperature and thorough mixing in order to completely bum out gas and particles. Hot gases flow from the secondary combustion chamber into the fire tube steam boiler and, when superheated steam is needed, into a steam superheating device. sawmills and municipal energy (district heating) companies. To date, over 60 BioGrate installations have been delivered to Scandinavia, the Baltic countries, Russia, Canada and France. For this existing The system produces very low emissions of CO2, Cx, Hy, NOx and particulates. Where a thermal output of more than 1 2 MWth is needed, a water tube boiler is assembled above the primary combustion chamber. The necessary insulation linings partly cover the water tube walls, depending on fuel properties, in order to maintain the high combustion temperature. in all applications the connecting channel customer base, bioboiler and biopower plants using BioGrate technology designed to cope with hard climate conditions and wet fuels provide a most competitive solution; future developments of BioGrate technology will build on this success to address operation in other environments. The BioGrate solution is based on a rotating conical grate. in the primary combustion chamber, fuel is fed upwards onto the rotating grate bars through a channel in the center of the chamber. Combustion is stable, because the fresh fuel entering in the center of the rotating conical grate does not disturb the surrounding burning fuel bed and the rotating grate bars control the thickness of the fuel layer. As the fresh fuel flows in a controlled fashion Customers benefit from operational reliability, high thermal efficiency, fuel flexibility anda long equipment /ifetime. This has been proven in the large numberof installations in operation. Future developments will address an enlarged field of power generation, and RioGrate technology will be adjusted for still lower emissions and different fuels like RDF between the combustor and the boiler creates a high turbulence for more efficient combustion of gas. Customers benefit from operational reliability, high thermal efficiency, fuel flexibility and a long equipment lifetime. This has been proven in the large number of installations in operation. Future developments will address an enlarged field of power generation, and RioGrate technology will be adjusted for stili lower emissions and different fuels like RDF, fast growing tropical woods and agricultural biomasses like sugar bagasse and rice husk. down to the combustion grates, it is dried by heat radiation from burning gas and the refractory surfaces lining the primary combustion chamber. The further the fuel rolls from the center, the more combustion takes place; the fuel is completely combusted when it reaches the outer edge of the grate and only ash is left. "in the future, the competitiveness of on-site industrial powder generation, stricter waste handling requirements and increasing environmental care will drive the growth of renewable energy," Mr Heikkinen comments. "Modular decentralized bio-energy systems offer a most interesting international market potential for us". ENERJi & KOJENERASYON DÜNYASI
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