Adding gas from biomass to the gas grid - SGC

active coal filter and cooled. The resulting syngas quality is given in table 70. The system availability isestimated at 7,000 hours/year. There are two plants currently in operation:• Aalen: pilot plant 1983 to 1987, commercial plant built in 1996 (in operation).• Freiberg: since 1994 in operation with industrial waste as feedstock, 20,000 ton/year.Quality Value UnitComponents• Carbon monoxide38 %• Hydrogen46 %• Methane0 %• Other hydrocarbons0 %• Carbon dioxide14 %• Nitrogen and argon1 %Contaminants• Ammonia0.5 ppm• Sulphur containing2 ppm• Hydrogen chloride1 ppm• Metal containing2 ppm• Metal carbides0 ppmCalorific value typical 10 MJ/m 3Table 70: Syngas properties of the Gibros PEC processpyrolysis:NOELL CONVERSION PROCESSProcess name: NTCManufacturerNOELLDescription:pyrolysis followed by gasification of organic residualsPyrolysis• pressure atmospheric• temperature 550 o C• reactants noneGasification• pressure 25 bar• temperatureof 2000 o C• reactants pure oxygen and steamStatus:pre-commercial pilots plantsThe waste is pyrolysed in an indirectly heated drum at a temperature at 550 o C. Pyrolysis cokes are cooled,separated from the metals, pulverised and brought to the gasifier reactor. The pyrolysis gases are cooled,compressed and brought to the gasifier reactor. The gasification process is at a pressure of 25 bar. Due tothe high temperature of 2000 o C the metal oxides melt and form slags. Water is injected to cool the syngasleaving the gasifier. The raw syngas is cleaned by SNCR and dry sorption.Pilot projects:page: 138