METHOD AND SYSTEM FOR LIQUID FUEL DESULPHURIZATION FOR FUEL CELL APPLICATION

摘要

A method for desulphurization of a liquid fossil fuel to be used in connection with a fuel cell is performed in a system comprising an evaporator unit (1), wherein the liquid fuel is first evaporated, a fixed bed reactor (2) in the form of a gas-phase hydro-desulphurizer, where the fuel is treated with hydrogen at atmospheric pressure over a highly active hydro-cracking (HAHT) catalyst, whereby sulphur species are converted to H2S, an adsorber (3), where the produced hydrogen sulphide can be adsorbed on a catalytic bed, and a fuel reformer (4), in which the fuel product is converted to syngas to be fed to an SOFC system (6). The evaporator unit (1) comprises a liquid spraying device, preferably in the form of a piezoelectric spray nozzle.

主权项

1. A method for desulphurization of a liquid fossil fuel to be used in connection with a solid oxide fuel cell (SOFC) system, said method comprising the following steps:
(a) evaporation of the selected liquid fossil fuel in an evaporator unit comprising a liquid spraying device, which has the ability of atomizing fuel at room temperature to a very small droplet size into a hot gas mixture comprising hydrogen and/or steam, preferably a piezoelectric spray nozzle with the ability of atomizing fuel at room temperature to a very small droplet size, and subsequent treatment with hydrogen in a fixed bed reactor over a catalyst, whereby sulphur species are fully/partially converted, mainly to the volatile sulphur species H2S and/or COS, (b) full or partial removal of the formed volatile sulphur species and (c) conversion of the product to mostly syngas in a connected fuel reforming unit, where the evaporation of the selected liquid fossil fuel and subsequent catalytic treatment with hydrogen in a fixed bed reactor in step (a) is conducted at a pressure below 5 bar (abs), preferably below 2 bar (abs) and most preferred close to ambient pressure, whereafter the obtained syngas is fed to the SOFC system.