downer reactor
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Author(s):  
Xueer Pan ◽  
Wenhao Lian ◽  
Jingxuan Yang ◽  
Junli Wang ◽  
Zhonglin Zhang ◽  
...  

Energy ◽  
2021 ◽  
pp. 123013
Author(s):  
Yuan Jiang ◽  
Peijie Zong ◽  
Yuan Bao ◽  
Xin Zhang ◽  
Haixin Wei ◽  
...  

Author(s):  
Bhuvaneswari Govindan ◽  
A. K Tiwari ◽  
Ullas Krishnan J.N ◽  
Jakka Sarat Chandra Babu ◽  
Radhakrishnan T.K ◽  
...  

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 916
Author(s):  
Juan S. Gómez Bonilla ◽  
Laura Unger ◽  
Jochen Schmidt ◽  
Wolfgang Peukert ◽  
Andreas Bück

Polypropylene (PP) powders are rounded at different conditions in a downer reactor with direct heating. The particles are fed through a single central tube, while the preheated sheath gas is fed coaxially surrounding the central aerosol jet. The influence of the process parameters on the quality of the powder product in terms of particle shape and size is analyzed by correlating the experimental results with the flow pattern, residence time distribution of the particles and temperature distribution predicted by computational fluid dynamics (CFD) simulations. An Eulerian–Lagrangian numerical approach is used to capture the effect of the particle size distribution on the particle dynamics and the degree of rounding. The simulation results reveal that inlet effects lead to inhomogeneous particle radial distributions along the total length of the downer. The configuration of particle/gas injection also leads to fast dispersion of the particles in direction of the wall and to particle segregation by size. Broad particle residence time distributions are obtained due to broad particle size distribution of the powders and the particles dispersion towards the wall. Lower mass flow ratios of aerosol to sheath gas are useful to reduce the particle dispersion and produce more homogenous residence time distributions. The particles’ residence time at temperatures above the polymer’s melting onset is determined from the simulations. This time accounts for the effective treatment (rounding) time of the particles. Clear correlations are observed between the numerically determined effective rounding time distributions and the progress of shape modification on the particles determined experimentally.


Energy ◽  
2021 ◽  
Vol 223 ◽  
pp. 119977
Author(s):  
Yuan Jiang ◽  
Peijie Zong ◽  
Xue Ming ◽  
Haixin Wei ◽  
Xin Zhang ◽  
...  

Clean Energy ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 167-179
Author(s):  
Bing Liu

Abstract The structural optimization of baffle internals for fast pyrolysis of coal with particulate mixing and heat transfer in a downer reactor using the discrete element method (DEM) has been investigated in this research. The pyrolysis terminal temperature at the exit of the downer reactor is not only decided by the volume-feeding-rate ratio of the coal to the sand, but also is affected by the inner structural design of the baffle internals in the downer reactor. As presented in the previous publication of the author, the inhibition from the baffle internals in a downer reactor can improve the particulate-mixing degree and heat carrier, and increase the mean residence time of the coal and heat-carrier particles in the downer reactor. The structure of the baffle internals in the downer reactor mentioned in this research can be optimized by the independently developed 3D soft-sphere model of the DEM programme of a 40-mm baffle length, a 30° baffle-slope angle and at least four baffles designed in the downer reactor, which is beneficial for the process design of coal pyrolysis with a heat carrier in the downer reactor.


2021 ◽  
Vol 320 ◽  
pp. 124401
Author(s):  
Yuanyu Tian ◽  
Jie Li ◽  
Wei Wei ◽  
Peijie Zong ◽  
Di Zhang ◽  
...  

Author(s):  
Bhuvaneswari Govindan ◽  
Sarat Chandra Babu Jakka ◽  
Radhakrishnan T.K. ◽  
Sashi kumar G.N ◽  
Tiwari A.K. ◽  
...  

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