| 摘要 |
A method for producing syngas from preferably vegetal biomass is described. The method provides for the use of a fixed bed gasifier, equipped with two reactors. The biomass is fed to both reactors together with a primary flow rate of air. Advantageously, the method according to the present invention is different from the known art since a secondary flow rate of air is withdrawn from the first reactor at the area where the biomass dries, and fed to the second reactor at the area where the biomass dries, and vice versa, alternately during time. Alternatively, an oscillating air flow is created in each reactor. The achievable result is a greater syngas production, but not exclusively. The syngas quality is improved too, since the biomass has a longer time for completing the gasification reactions. |
| 主权项 |
1. A method for producing syngas from preferably vegetal biomass, comprising the steps of:
a) prearranging a gasifier (100) provided with at least one first reactor (1) and at least one second reactor (2), b) feeding, in each reactor (1, 2), biomass and a primary flow rate of oxidizing aeriform fluid, to the extent of obtaining a fixed bed of drying biomass, biomass (12) subjected to pyrolysis and biomass char (13), that release the syngas, wherein the primary flow rate of oxidizing aeriform fluid is fed co-current or counter-current to the reactors (1, 2) with respect to the biomass, and/or is fed into a chamber (3) connecting the reactors (1, 2), and wherein the steps alternated in time, which promote the char (13) gasification, of: c) suctioning a secondary flow rate of oxidizing aeriform fluid from the first reactor (1), at the area where the biomass dries, and feeding to a second reactor (2), at the area where the biomass dries, and d) suctioning a secondary flow rate of oxidizing aeriform fluid from the second reactor (2), at the area where the biomass dries, and feeding to a first reactor (1), at the area where the biomass dries, or, as an alternative to steps c) and d), the method comprises the steps, alternated in time, of: e) increasing the volume of the first reactor (1) to expand a volume of oxidizing aeriform fluid at the area where the biomass dries and, at the same time, decreasing the volume of the second reactor (2) to compress a corresponding volume of oxidizing aeriform fluid at the area where the biomass dries, and f) increasing the volume of the second reactor (2) to expand a volume of oxidizing aeriform fluid at the area where the biomass dries and, at the same time, decreasing the volume of the first reactor (2) to compress a corresponding volume of oxidizing aeriform fluid at the area where the biomass dries. |
