Progress and results of UKhIN work on caking and coke formation theory
Early investigations led to fundamental research to study the kinetics of thermochemical transformations in coals and thus derive a mathematical model of the entire set of processes. An hypothesis was developed about the nature of thermochemical transformation processes in coals as a chain of successive and parallel reactions of the radical type, involving degradation of the macromolecules and interactional synthesis reactions between the newly liberated radicals and fragments of various complexities. Experimental investigations used traditional and modern techniques. Special attention was devoted to studying the kinetics of processs that take place when coals are heated to a wide range of temperatures, under both isothermal and nonisothermal conditions. The results were used to formulate a general hypothesis of the stepwise nature of the observed phenomena, draw up a broad scheme of the reactions involved and calculate the kinetic factors for each stage in the process. These theoretical assumptions and experimentally established kinetic characteristics provide a basis for proposals on how to control the processes of coal caking an coke formation to improve the existing coking technology and develop new commercial processes, e.g. by increasing yield of mobile liquid products as the heating rate is increased, especially when carbonizing low-rank coals. Analysis of the kinetic model shows further that a larger yield of mobile liquid products should be obtained, by the thermal degradation of coarse rather than fine grains. The stepwise nature of these processes and the quantitative data on reaction rates and activation energies have provided a theoretical basis for new methods of coke production which have been under development, using continuous techniques with regulation by stages (formed coke, continuous bed carbonization).
- OSTI ID:
- 5413421
- Journal Information:
- Coke Chem. USSR (Engl. Transl.); (United States), Vol. 6; Other Information: Translated from Koks Khim.; No. 6, 33-36(1980)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
COKING
CHEMICAL REACTION KINETICS
MATHEMATICAL MODELS
ACTIVATION ENERGY
CAKING POWER
CHEMICAL REACTIONS
CHEMISTRY
COAL RANK
HYDROGEN
MEETINGS
PLASTICITY
RADICALS
USSR
YIELDS
ASIA
CARBONACEOUS MATERIALS
CARBONIZATION
DECOMPOSITION
EASTERN EUROPE
ELEMENTS
ENERGY
ENERGY SOURCES
EUROPE
FOSSIL FUELS
FUELS
KINETICS
MATERIALS
MECHANICAL PROPERTIES
NONMETALS
REACTION KINETICS
010401* - Coal & Coal Products- Carbonization- (-1987)