BIOGAS TECHNOLOGY BASED ON VALUING THE URBAN AND AGRI-FORESTRY SOLID CUMBERSOME WASTE

The study proposes a new process and plant construction for the gasification (through pyrolysis) of solid urban forestry and agricultural cumbersome waste that provides the obtaining ecologically three products: 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 gas 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 hardening in the foundry or in building, mainly in road lying). The proposed biomass (waste) gasification process and of resulting gas using have several steps: collection; processing; gasification; gas cleaning and gas use (compressed 80 % for the use as fuel and 20 % can be liquefied). The syngas process has a high energy efficiency by a high purity of the synthesis gas and of a relatively low temperature (300-500 °C) in the purpose of direct use of the gas for producing heating, electricity and/or second generation biofuels. The syngas plant provides the continuous synthesis gas supplying during its whole working time (reaching decades) and can be used in the municipal landfill reducing in time their dimensions 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 plant of suitable dimensions can be mounted on a trailers to be moved at the biomass waste deposits. The main product (syngas) may be transformed in ethanol, other fuels or chemicals (even hydrogen), or in electricity and heat by very known procedures.