Li Hongzhong, a Chemical Engineering Expert, Leads a Fluidized Life that is Full of Wisdom Among Particles
Li Hongzhong is a well-known chemical engineering expert and one of the academic leaders in the field of fluidization research.Prof.Li is a full-time professor at the Institute of Process Engineering (IPE) (formerly the Institute of Chemical Metallurgy (ICM) before 2001), Chinese Academy of Sciences (CAS) and was elected Member of the CAS in 2005.He was born in Xiyang County, Shanxi Province in 1941 and graduated from the Department of Chemical Engineering, Taiyuan University of Technology in 1965.Since then, he worked as an Assistant Fellow at the Institute of Coal Chemistry (ICC), CAS before 1978, after which he started his postgraduate study.He received his master degree in chemical engineering from the University of Science and Technology of China in 1981 and his doctor degree in chemical engineering from the ICM, CAS in 1986.He worked as a postdoctoral fellow and visiting scholar at the Department of Chemical Engineering, University of British Columbia, Canada during 1986—1988.Since 1988, Prof.Li worked at ICM, CAS as a full-time research scientist.His research interests focused on the theoretical foundation and industrial application of fluidized/non-fluidized bed technology.When he worked at ICC, CAS, he engaged in developing a fluidized bed reactor to convert butene into butadiene, which belonged to the state key project for butadiene rubber and this project was awarded the State Top Class Prize for Science and Technology Progress in 1985.When he worked at UBC, Canada, he engaged in the combustion of different fuels in a pilot scale circulating fluidized bed combustor, and the paper titled "Combustion characteristics of different fuels in a pilot scale circulating fluidized bed combustor" was awarded the Best Paper Prize at the 10th International Conference on Fluidized Bed Combustion in 1989 in San Francisco.When he studied and worked at IPE, CAS, he established the dynamic theory of gas-solids moving beds and the models to describe the gas and solids flows in vertical and inclined moving beds by coupling the basic principles of multi-phase flow with the particulate media mechanics.This theory can predict the gas and solids flow rates, the distributions of the gas pressures, the particle-particle and particle-wall contacting stresses, as well as the arching width.He developed the dynamic models and design methods for the different kinds of non-mechanic valves such as L-valve and U-valve, which are used to pneumatically control the solids flow rate in gas-solid multi-phase flow systems.He invented moving-bed type V-valve and pneumatically controlled peristaltic feeder, vertical pneumatic critical moving bed transport etc.He establishes the theory of non-fluidized gas-solid two-phase flow, which enriches the scientific connotation of multi-phase flow and solves the practical issues with industrial manufacturing of powder.He is the first person who photographs the particle clusters and the dilute/dense two-phase structure in the fast fluidized bed.By using a self-developed optic fiber micrograph probe, he succeeded in taking photos of transient clusters and the two-phase structures of dilute and dense phases in the fast fluidized bed.His creative work leads to the proof of the agglomerating phenomena and the great attention of scientists from both domestic and overseas.He also proposes the theory of gas-solid particulatization, including particle and additive design (the particle design involves density, size and size distribution, shape and surface status etc., the additive selection means to select suitable fine particles or coarse particles as the additives.), fluid design (fluid density and viscosity), external field design (vibrating field, acoustic field, centrifugal force field, and magnetic field etc.), and internals-vessel configuration design (ring internals, perforated plate, remiform internals, shutter typed internals, shallow bed, conical bed, fast fluidized bed, turbulent bed etc.), which can restrain and eliminate the bubbles and agglomerates in gas-solids fluidized beds.This is of great help to the realization of the particulate and homogeneous fluidization, which significantly improves the conversion efficiency of traditional multiphase reactors.He establishes the quantitative control method of structure-transfer relationship and fluidized bed reaction behavior, which guides the reactor design and optimization.Based on the above research foundations, he promoted many applications of fluidization technology in the chemical engineering and metallurgy industries, such as iron ore reduction and manganese dioxide ore reduction.This paper introduces Li's spirit of dedicating to serving the country from the aspects of his educational experience, innovative scientific research, industrial development, book writing and talent cultivation.
Li Hongzhongfluidizationgas-solid two-phase flowparticulatizationstructure-transfer theory
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