The advanced dual fluidized bed (DFB) gasification technology allows to generate medium-calorific product gas from various feedstock. Thereby, biogenic residues, municipal and industrial wastes e.g. sewage sludge or rejects from pulp and paper industry can be utilized. The varying chemical properties of these feedstock pose a challenge not only to the DFB reactor system, but also demand improved gas cleaning of the generated product gas. Downstream gas cleaning and a Fischer-Tropsch plant converts the product gas into valuable products such as Fischer-Tropsch diesel or waxes. Over the last years, extensive research was conducted and over 50 fuels were tested on daily operation test runs in a 100 kW advanced DFB pilot plant at TU Wien. Based on the gained experience, a 1 MW demonstration plant was designed, built and commissioned, thus allowing the experimental gasification of various feedstock on a close-to-industrial scale. Investigating the feasibility of upscaling the technology with regards to product gas quality and operation parameters is the focus of the current test runs. In order to validate and verify the data from these campaigns, a process flow simulation using the software IPSEpro is conducted. This allows calculating otherwise immeasurable values such as mass and energy balances, heat losses and conversion efficiencies of chemical feedstock power into product gas power. This paper presents the results from these simulations to provide a comparison of different operating points for the feedstock wood chips Different temperatures, fuel loads, steam-to-fuel ratios and circulation rates, determine these operation points. During test campaigns, wood chips were used for gasification. Input data for the simulation model consists of the plants distributed control system, fuel and bed material analysis, online gas analytics, and analytical results of wet-chemical tar, NH3, H2S, HCl, sampling. Key performance indicators for the demonstration plant include e.g. cold gas efficiency, water conversion, and product gas yield. Additionally, by the use of the simulation results, the fluidization regimes in the reactor system can be determined. Results from the simulation allow drawing meaningful comparisons between design parameters, derived from 100 kW pilot plant operation and the upscaled 1 MW demonstration plant. This gives the opportunity to generate design values for industrial DFB gasification plants in the future.