Biogas technology based on valuing the urban and agri-forestry solid cumbersome waste.

Abstract

The study proposes a new process and plant construc tion for the gasification (through pyrolysis) of solid urban for estry and agricultural cumbersome waste that provides the obtaining ecologically three prod ucts: 1. synthesis gas with a high calorific power, resulting from the pyrolisis of the organic materials (wood, paper, forestry, agriculture and food industry waste, etc.). This ga s can be used in producing second generation biofuels, including hydrogen 2. an alloy of liquid metal, used in the metallurgical industry; 3. a molten slag (usable after the harden ing in the foundry or in building, mainly in road lying). The proposed biomass (waste) gasificat ion process and of resulting gas using have several steps: collection; processing; gasific ation; gas cleaning and gas use (compressed 80 % for the use as fuel and 20 % can b e liquefied). The syngas process has a high energy efficiency by a high purity of the synt hesis gas and of a relatively low temperature (300-500 °C) in the purpose of direct uof the gas for producing heating, electricity and/or second generation biofuels. The syngas plant provides the continuous synthesis gas supplying during its whole working ti me (reaching decades) and can be used in the municipal landfill reducing in time their dimen sions and in the rural areas (forestry or agriculture), also, for the gasification the solid waste specific for these areas (straw, grass, seeds, leaves, branches, etc.), case in which the p lant of suitable dimensions can be mounted on a trailers to be moved at the biomass waste depo sits. The main product (syngas) may be transformed in ethanol, other fuels or chemicals (e ven hydrogen), or in electricity and heat by very known procedures.