## 1 Introduction
It has been stated that the greatest challenge in using gasified biomass for methanol production lies in the large excess of carbon in the syngas [2]. An option to deal with this issue consists of using an acid-gas separation process to remove CO\({}_{2}\) from the syngas until the correct balance ratio is reached. Another approach to obtain this ratio is to add H\({}_{2}\) to the syngas. The endothermal WGS reaction can be used for this purpose. Alongside H\({}_{2}\), CO\({}_{2}\) is also formed by the reaction. Some of this CO\({}_{2}\) has to be removed from the gaseous mixture, decreasing the process carbon yield and maintaining CO\({}_{2}\) emissions, even though the carbon released is of biogenic origin. The WGS reaction also affects the overall process heat output negatively. An alternative source of H\({}_{2}\) would be from an electrolyser. If the electricity consumed by the electrolyser comes from a renewable source, such as hydropower, then the process remains carbon-neutral, meaning that it does not require the use of fossil carbon. In addition, hydropower is usually much cheaper than power generated by other renewable means. Areas of the world where biomass and hydropower are readily available are ideally suited to biomethanol production. [PERSON] et al. modeled a system made of a wheat straw fueled, low temperature circulating fluidised bed and a high-temperature solid oxide electrolyser (SOE) to synthesise methanol with high energy efficiency and high carbon conversion yield [3]. They explained that the SOE requires less electrical energy, compared to lower temperature electrolysis technologies. They stated that the extra heat required for the endothermal SOE reaction, compared to other technologies, can easily be provided by the gasification reactions. They mentioned the usefulness of having a general match between the SOE operating temperature and the gasification temperatures. They showed that the SOE generates separate streams of O\({}_{2}\) and H\({}_{2}\) that can both be used advantageously. The O\({}_{2}\) can be used as a gasifying agent to enhance energy efficiency. The H\({}_{2}\) can be used to boost methanol production. Precise prediction of gasification product characteristics (e.g., product distribution, chemical composition, and energy content) and process variables is very challenging. Some research has been directed towards improving such predictions for the purpose of optimizing operation conditions, such as in a downdraft gasifier [4]. Some modelling studies have been conducted on the simulation of more complex systems, such as a technology that included an entrained flow gasifier [5]. Artificial intelligence has been applied with the objective of obtaining more accurate predictions for the thermal properties of biomass [6]. The present article is not devoted to obtaining simulation results that provide the most precise possible predictions, at a level that would be required, for example, for industrial design and specifications. Through simple, basic modelling, the purpose of the current paper is to show the potential and introduce a new integrated system concept. This article aims at briefly presenting and demonstrating the usefulness of using an extra source of renewable H\({}_{2}\) instead of relying on the WGS reaction, for a much higher performance of syngas production from gasification of wood in a simple system that includes a fixed-bed gasifier. With the use of a process simulation program, we demonstrate the usefulness of a judicious integration of high-temperature water electrolysis, for a drastic increase in carbon conversion yield. A general process concept is exposed in the form of simple mathematical blocks, relying on mass and energy balance, stoichiometry, and thermodynamics. This process is conducive to biomethanol production in dispersed, small plants using local biomass for end-users from the same geographical area, thus contributing to regional sustainability.