Small scale biomass gasifiers have the advantage of having higher electrical efficiency in comparison to other conventional small scale energy systems. Nonetheless, a major drawback of small scale biomass gasifiers is the relatively poor quality of the producer gas. In addition, several EU Member States are seeking ways to store the excess energy that is produced from renewables like wind power and hydropower. A recent development is the storage of energy by electrolysis of water and the production of hydrogen in a process that is commonly known as “power-to-gas”. The present manuscript proposes an onsite secondary reactor for upgrading producer gas by mixing it with hydrogen in order to initiate methanation reactions. A thermodynamic model has been developed for assessing the potential of the proposed methanation process. The model utilized input parameters from a representative small scale biomass gasifier and molar ratios of hydrogen from 1:0 to 1:4.1. The Villar-Cruise-Smith algorithm was used for minimizing the Gibbs free energy. The model returned the molar fractions of the permanent gases, the heating values and the Wobbe Index. For mixtures of hydrogen and producer gas on a 1:0.9 ratio the increase of the heating value is maximized with an increase of 78%. For ratios higher than 1:3, the Wobbe index increases significantly and surpasses the value of 30 MJ/Nm³.

与其他传统的小型能源系统相比，小型生物质气化炉具有电效率更高的优势。但是，小型生物质气化炉的主要缺点是生产气体的质量相对较差。此外，一些欧盟成员国正在寻找方法来存储由风能和水力发电等可再生能源产生的多余能量。最近的发展是通过水的电解来存储能量并在通常被称为“动力转化为气体”的过程中产生氢。本手稿提出了一种现场二级反应器，用于通过将生产气与氢气混合来提质生产气，从而引发甲烷化反应。已开发出一种热力学模型，用于评估提议的甲烷化过程的潜力。该模型利用了代表性的小型生物质气化炉的输入参数和氢气的摩尔比（从1：0到1：4.1）。Villar-Cruise-Smith算法用于最小化吉布斯自由能。该模型返回了永久气体的摩尔分数，热值和Wobbe指数。对于比例为1：0.9的氢气和生产气的混合物，发热量的增加最大，增加了78％。对于高于1：3的比率，Wobbe指数会显着增加并超过30 MJ / Nm的值 对于比例为1：0.9的氢气和生产气的混合物，发热量的增加最大，增加了78％。对于高于1：3的比率，Wobbe指数会显着增加并超过30 MJ / Nm的值 对于比例为1：0.9的氢气和生产气的混合物，发热量的增加最大，增加了78％。对于高于1：3的比率，Wobbe指数会显着增加并超过30 MJ / Nm的值³。