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Study of low temperature processes for non-reactive elimination of tars from the producer gas

Abstract : This thesis focuses on the tar treatment process that enables the conversion of the producer gas obtained from biomass gasification into methane through a catalytic methanation. To do so, the tar content (including BTX) should be reduced to 1 mg.Nm-3. Tar treatment processes present to date an economic burden and an energy penalty. Consequently, psychrometric charts are developed for the tar representative components in the producer gas. Based on the charts, a temperature of -110°C is required to reach the acceptable tar content. Therefore, low temperature processes for tar removal are proposed. However, the gas should be pre-treated in two water-based scrubbers in order to reduce its temperature, its moisture content and its heavy tar fraction. Only benzene and toluene remain in the producer gas after the scrubbers. Afterwards, the gas flows over cooled plates over which a simultaneous deposition/condensation takes place. Below 5°C, benzene forms a porous frost layer while toluene condenses as a liquid. The tar removal at low temperatures, induces the water vapor frosting remaining in the producer gas in addition to CO2 frosting below -95°C. The simulation results allowed to analyze the impact of the operating conditions on the tar removal and the required energy for tar removal. Finally, a techno-economic analyses showed that tar removal at low temperature is a promising solution. The total cost rate of the proposed refrigeration system is reduced by integrating the cold of the producer gas in the refrigeration cycle. Hence, this thesis establishes the basis of a new method for tar removal at low temperatures.
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Submitted on : Friday, January 21, 2022 - 10:45:08 AM
Last modification on : Sunday, January 23, 2022 - 3:03:59 AM
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  • HAL Id : tel-03538633, version 1


Rita Harb. Study of low temperature processes for non-reactive elimination of tars from the producer gas. Chemical and Process Engineering. Université Paris sciences et lettres, 2021. English. ⟨NNT : 2021UPSLM041⟩. ⟨tel-03538633⟩



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