Model investigation of condensation behaviors of alkalis during syngas treatment of pressurized biomass gasification
| Autor: | Klas Engvall, Wei Wan, Weihong Yang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
020209 energy
Process Chemistry and Technology General Chemical Engineering Carbonation Condensation Energy Engineering and Power Technology Biomass chemistry.chemical_element 02 engineering and technology General Chemistry Alkali metal Oxygen Industrial and Manufacturing Engineering 020401 chemical engineering Chemical engineering chemistry Fluidized bed 0202 electrical engineering electronic engineering information engineering Deposition (phase transition) 0204 chemical engineering Syngas |
| Zdroj: | Chemical Engineering and Processing - Process Intensification. 129:28-36 |
| ISSN: | 0255-2701 |
| DOI: | 10.1016/j.cep.2018.05.001 |
| Popis: | In order to eliminate problems such as corrosion and ash deposition caused by alkalis, effects of the biomass composition and the pressure of syngas in the downstream process on condensation of alkalis in a wood steam/oxygen blown fluidized bed gasification process are investigated based on a model. This model is established by combining Aspen Plus with SimuSage. Aspen Plus is applied to predict the composition of major gas species formed by C, H, O, N, S and Cl, using empirical correlations to predict the yields of non-equilibrium substances. SimuSage is used to study the release and condensation of inorganics associated with the minor elements (Al, Ca, Fe, K, Mg, Na, P, Si and Ti) based on a customized thermodynamic database. Results show that carbonation reactions between alkalis and CO/CO2 can be occurred during gas cooling, leading to form alkali carbonates in the condensed phase. The temperature window forming melts varies with the change of the downstream pressure of syngas and the elemental composition of biomass. As the syngas pressure in the downstream process decreases, the initial temperature of forming melts during gas cooling is reduced. For biomass lower in K/Cl ratio, the condensate with the largest mass formed during gas cooling is potassium chloride. The condensation rate of Cl increases with the decrease of the K/Cl ratio in biomass. |
| Databáze: | OpenAIRE |
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