Resumen de Producción de energía eléctrica a partir de basura doméstica. Valorización térmica de basura en el lecho fluído circulante: el proceso WIKONEX de Lurgi
Dpto. Medio Ambiente de Lurgi
Lurgi's WIKONEX process (waste conversion process) achieves with high efficiency the recovery of the waste-borne energy due to:
- the utilization of a fluid bed super heater to overheat the steam in the gasification system (operation with higher steam parameters), - the utilization of air for gasification and combustion at high temperature (minimization of self-consumption), - waste drying (minin1ization of the gas volume).
After the grinding- and drying, the waste will be gamified with the addition of air in the circulating fluid bed (CFB) The generated gas will be burnt in a combustion chamber at high temperatures, destroying the existing organical substances, including dioxines and furanes. At the same time, the ashes carried with by the gas (as well as the bottom ashes from the gasifier and the fly ashes from the flue gas cleaning process) will be fused to obtain a vitrified granular, as good as non lixiviable which can be used as construction material.
The superheated high-pressure steam generated in the recovery boiler/fluid bed superheater will be sent to a turbine for the generation of electric energy in the flue gas cleaning process will be produced gypsum and chlorohydric acid as subproducts, whilst at the end of the effluent treatment there will remain small amounts of heavy metal dusts and salts which have to be eliminated as special waste. The emissions through the stack are clearly lower than the limit value given by the seventeenth Federal Decree on Emissions Control (17. Bundes-Immissions-Schutz-Verordnung). Lurgi's WIKONEX process is very flexible regarding the types of waste to be used (residual household waste, assimilable waste, sewage sludges, other types of waste).
