METHOD OF PRODUCING ELECTRICITY FROM SUBSTANDARD FUEL BIOMASS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC F02C3/28 F23G5/27 C10J3/66 

FIELD: electricity.

SUBSTANCE: method provides for the first stage the supply of raw materials - crushed fuel biomass of various origins - and its steam-air gasification in a dense layer in a direct-process gasification reactor, while in the process of gasification in countercurrent flow of raw materials through the lower part of the gasification reactor where the accumulation and withdrawal of solid products are carried out - gasification wastes, gasifying agents - air and water vapour and/or water - are supplied to the active gasification zone by means of, for example, blowing, in the ratio necessary for the occurrence of redox reactions of gasification with the raw materials, and the resulting gasification combustible fuel gas is filtered through a layer loaded in the gasification reactor of the raw material and is discharged from its upper part for use in the second stage, including the burning of the resulting fuel gas in a steam boiler, converting heat energy of steam into mechanical energy in a thermal machine and an electric energy through the generator. Moreover, raw materials for gasification - substandard in terms of moisture content of the fuel biomass, are subjected to preliminary preparation, including drying, for which a closed loop of the working medium of the heat engine is created, in which the exhausted steam is cooled in an air condenser by atmospheric air, which is then used by forced circulation as a drying agent for convective air-heater-drying of the raw material, and the exhausted steam that has completed the phase transition, in the form of condensate, continues to circulate in a closed circuit. The raw material for drying is an optimized biofuel mixture, which is obtained by mixing raw materials from different groups characterized by different values of the biomass fuel parameters, including substandard one or several parameters. The optimized characteristic is the relative humidity of the biofuel mixture, the optimisation parameter is the composition of the mixture as the ratio of the weight fractions of the raw material species in the final mixture, and the optimality criterion is the correspondence of the relative humidity of the biofuel mixture to the optimum value providing the maximum electrical efficiency at the generator output with complete removal of external moisture from the raw material in the process of its drying.

EFFECT: increasing the efficiency of electricity production.

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