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huayin brand batch type lab scale rotary kiln pyrolysis reactor

modeling and pilot plant runs of slow biomass pyrolysis in

modeling and pilot plant runs of slow biomass pyrolysis in

Pyrolysis of biomass in a rotary kiln finds application both as an intermediate step in multistage gasification as well as a process on its own for the production of biochar. In this work, a numerical model for pyrolysis of lignocellulosic biomass in a rotary kiln is developed. The model is based on a set of conservation equations for mass and energy, combined with independent submodels for the pyrolysis reaction, heat transfer, and granular flow inside the kiln. The pyrolysis reaction is described by a two-step mechanism where biomass decays into gas, char, and tar that subsequently undergo further reactions; the heat transfer model accounts for conduction, convection and radiation inside the kiln; and the granular flow model is described by the well known Saeman model. The model is compared to experimental data obtained from a pilot scale rotary kiln pyrolyzer. In total 9 pilot plant trials at different feed flow rate and different heat supply were run. For moderate heat supplies we found good agreement between the model and the experiments while deviations were seen at high heat supply. Using the model to simulate various operation conditions reveals a strong interplay between heat transfer and granular flow which both are controlled by the kiln rotation speed. Also, the model indicates the importance of heat losses and lays the foundation for scale up calculations and process optimization.

pyrolysis - sciencedirect

pyrolysis - sciencedirect

Pyrolysis is a well-known process, widely and extensively researched at lab-scale and pilot-scale, in batch and continuous processes, including those induced by thermal and more recently via microwave heating. In addition, industrial-scale plants are recently appearing given the process advantages, regulations, and the technological maturity offered by some suppliers. Pyrolysis of waste tires (WT) is a promising sustainable source of fuels and petrochemical substitutes. It may help in compensating the progressive consumption of petroleum-based products, while valorizing an important and complex waste in the circular economy framework. Pyrolysis of WT releases the rubber, as volatile matter, from the carbonaceous structure fixed by the carbon black (CB) used in tire manufacture. Thus a mixture of gaseous products and condensable hydrocarbons is produced, as well as a solid fraction mainly composed by the CB depending on the tire part and branch, so-called recovered carbon black (rCB). This work outlines a brief state-of-the-art of the pyrolysis of WT considering a general description of the current technologies available at industrial-scale paying special attention to some characteristics of rCB produced.

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