Method and system for producing biomethane and ecological methane

Abstract

The method for the manufacture of bio-methane and eco-methane according to the present invention consists in hydrogasification of a mixture of bio-carbon and fossil carbon in a carbon hydrogasification reactor using bio-hydrogen obtained in a reactor for the production of bio-hydrogen from a mixture of bio-methane with steam in the presence of a catalyst. That mixture is preheated by a heating gas that is heated up in a preheater and flows around tubes in the bio-hydrogen production reactor. The raw gas formed, after purification, is subjected to separation into hydrogen and methane sent to a hydrogen production process and to a gas distribution pipeline. The hot mixture of hydrogen and CO2 leaving the bio-hydrogen production reactor is subjected to cooling down in a waste heat boiler and, subsequently, separation into bio-methane sent to the carbon hydrogasification reactor and CO2 sent to the CO2 sequestration process. The system for the manufacture of methane consists of a first reactor (1) for the hydrogasification of a mixture of bio-carbon and carbon prepared by a carbon feed preparation unit (25) connected to a biomass pyrolysis reactor (2) and a carbon conveyor (24) and fed by a carbon mixture conveyor (26) to the first reactor (1) connected to a vapour and gas separator (5), said separator having a hydrogen outlet connected to the first reactor (1) and to a burner (14) in a preheater (9) and a methane outlet connected to a third reactor (3) and a pipeline (20b) to a gas distribution pipeline. In addition, the third reactor (3) has a heating gas nozzle (10d) connected via pipeline (10) to the preheater (9), and the outlet of that gas is connected via pipeline (10a) to a heat exchanger (9a) of the preheater (9). The outlet of the mixture of hydrogen and CO2 from the third reactor (3) is connected via pipeline (10b) to a heat exchanger (4a) in the waste heat boiler (4) and, subsequently, to a hydrogen gas separator (8) whose hydrogen outlet is connected via pipelines (18a) and (18b) to the first reactor (1) and the CO2 outlet is connected via CO2 pipeline (10e) to a CO2 sequestration system.

Description

technical field [0001] The subject of the present invention is a process for the production of biomethane and ecological methane by hydrogasification of biochar and fossil carbon, wherein biohydrogen is the gasification agent. Background technique [0002] Biohydrogen is a product formed from biomass through the reaction of biomethane with water vapour. Biomethane is the product of the hydrogasification of biochar using biohydrogen. The product of the hydrogasification of coal or lignite with biohydrogen is ecomethane. Biochar is the product of pyrolysis of dry biomass, preferably with a high content of cellulose, hemicellulose and lignin. Further advantageous pyrolysis products are combustible vapors and gases hereinafter referred to as pyrolysis gases. The product of incomplete pyrolysis of biomass at 170°C to 270°C is a semi-carbon containing approximately 60% to 65% elemental carbon C' with chemical properties similar to those of lignite. The product of complete pyro...

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