Development of a Drop Tube Reactor to Test and Assist a Sustainable Manufacturing Process
This work outlines the development of a Drop Tube Reactor (DTR) following a simulation assisted design. The general purpose of the DTR is to simulate the thermochemical conversion process of solid hydrocarbon feedstock, such as coal, coke, biomass, and industrial waste under controlled reaction conditions. It supports the development of more efficient and flexible conversion devices (i.e. reactors, gasifier, etc.) to accommodate none conventional solid fuel, i.e. biomass and solid waste material. The DTR is extensively used in investigating the thermochemical pathways and in the development of high fidelity reactive flow models. As this device is custom made, the thermochemical loading, i.e. thermal flow/heating and exothermic reactivity requires detailed flow analysis. This work attempts to provide guidelines for the DTR development. It details the functionality of the main device components, investigates the flow conditions and suggests the tube material by considering a variable heating flux and mass flow rate in a conjugate heat flow environment. The results demonstrated how basic analytical calculations, CFD simulation, and conjugate heat analysis influence design decisions. In particular, the effect of the heat flux and mass flow rate and their effect on the flow pattern are investigated. Results have shown that the adjustment of the wall heat flux leads to a more predictable change in temperature whereas the variation in the mass flow rate results in a more predictable change in the velocity profile. The residence time varies linearly with mass flow rate and nearly parabolic with wall heat flux. An increase of the heat flux requires adjustment of the mass flow rate to maintain particle residence time at a constant value.
KeywordsGasification Drop Tube Reactor Sustainable Product Development Small Scale Experiments Simulation Assisted Design
Unable to display preview. Download preview PDF.
- 1.Mincher, A. J., 2005, Coal gasification for advanced power generation, Fuel, Pages 2222–2235Google Scholar
- 2.Ricketts, B., 2002, Technology Status Review of Waste/Biomass Co-Gasification with Coal, IChemE Fifth European Gasification Conference Google Scholar
- 3.Ciaxia Chen, Masayuki Horio, Toshinori Kojima, 2000, Numerical simulation of entrained flow coal gasifiers, Chemical Engineering Science, Pages 3861–3874 and 3875–3883Google Scholar
- 4.S. Kajitani, S. Hara, H. Matsuda, 2002, Gasification rate analysis of coal char with a pressurized drop tube furnace, Fuel, 539–546Google Scholar
- 5.M. Cloke, E. L., 2002, Combustion characteristics of coals using a drop-tube furnace, Fuel, 727–735Google Scholar
- 6.Shan Ouyang, H. Y., 1998, A pressurized drop-tube furnace for coal reactivity studies, Review of scientific instruments, Volume 69, Number 8Google Scholar
- 7.Ilham Talab, Zaki Al-Nahari, Rana Qudaih, and Isam Janajreh, Masdar Institute of Science and Technology, 2011, Solar Assisted Gasification: Implementation and Systematic Analysis, International Journal of Energy, Environment and Economics, in PressGoogle Scholar
- 8.Mills A. F., 1999, Heat Transfer, second edition, University of California at Los Angeles, Princeton Hall Inc.Google Scholar
- 9.Francisco V. Tinaut, Andres Melgar, Juan F. Perez, Alfonso Horrillo, 2008, Effect of biomass particle size and air superficial velocity on the gasification process in a downdraft fixed bed gasifier. An experimental and modelling study, Fuel Processing Technology, Pages 1076–1089Google Scholar
- 10.Colomba Di Blasi, 1996, Heat, Momentum, and Mass Transport Through a Shrinking Biomass Particle Exposed to Thermal Radiation, Chemical Engineering Science, Vol. 51, No. 7, pp. 1121–1132Google Scholar