Updraft gasification of pelletized hydrochar is a relatively new method in the thermochemical conversion of syngas. Syngas utilization depends on its applicability to the industry, i.e., cold utilization for operating IC or gas engines. The present work is a steady numerical investigation of thermal fluid behavior based on the kinetic model of MSW-coconut husk with HTC pretreatment. It deals with the CFD simulation of an updraft fixed bed gasifier. Three injection rates were taken into consideration for simulating the k-epsilon turbulence, species transport, and temperature profile of gasification using a Non-Premixed Combustion Species approach. The carbon dioxide mixed with nitrogen as inert entering the bottom inlet was utilized as the gasifying agent. The MSW: CH with a blend ratio of 1:9 was characterized as sample fuel. The CFD simulation using Ansys 2022 showed an increasing trend in the CO/H2 ratio at a faster injection rate. The principle of injection is similar to ER variation, which influences the temperature profile at the combustion zone. In effect, the synthesis gas yields depend on the reaction rates coupled by increasing temperature gradient. The results of kinetic energy achieve normalized results with a faster dissipation rate, thus contributing to higher heat generation. The results imply that the MSW: CH sample can be used as a feed type for updraft reactors. Thus, it can be concluded that the simulated gasifier can be applied as a base design for standardized industrial reactors.