Showing papers on "Carbochemistry published in 2012"
TL;DR: In this paper, the main technical and structural characteristics of Tavantolgoi coal from Mongolia are determined and the type, code number and other valuable technological indexes of the coal are estimated according to the international classification system of coals.
Abstract: Main technical and structural characteristics of Tavantolgoi coal from Mongolia are determined. Type, code number and other valuable technological indexes of the coal are estimated according to the international classification system of coals. Cokes obtained in a laboratory chamber stove and in a reactor was characterized.
4 citations
TL;DR: In this article, the main characteristics of the composition of coals from Mongolian deposits and their reactivity in thermal dissolution and coking processes were determined, and the thermochemical conversion of coal into hydrocarbon products was studied.
Abstract: The main characteristics of the composition of coals from Mongolian deposits and their reactivity in thermal dissolution and coking processes were determined. The thermochemical conversion of coals into hydrocarbon products was studied. It was found that Tavantolgoi coal is characterized by high coking properties with the yield of carbon residue to 82.3%. The composition of semicoking tar was studied by chemical analysis and IR spectroscopy.
2 citations
01 Jul 2012
TL;DR: In this article, the effect of minerals on the gasification reactivity of coal has been studied by TGA using CO2 as a gasifying agent and surface properties such as, true density apparent density, porosity surface area of different gravity cut samples have also been measured to find out the impact of gravity separation on gasification reaction.
Abstract: Minerals in coals cause operational problems in various coal utilization technology as well as act as diluents towards its heat value. Indian coals contain higher percentage of mineral matter compared to foreign coal due to its formation through drift origin. Efficient utilization of high ash coal in environment friendly manner is the driving force for the development of clean coal technology. Coal gasification offers practical means meeting stringent environment controlled parameters for producing power, chemicals, liquid fuels and clean energy on a single platform. It is well accepted that gasification technology has sufficient potential for sustainable development of clean coal technology. Gasification reactivity depends on the coal properties and operational parameters as well as minerals present in coal. Minerals not only create operational problems but on the other side also catalyze the gasification and combustion reaction. Therefore to understand the effect of minerals on the gasification reactivity, present paper proposes to study the variation of gasification reactivity with various gravity cuts such as, 1.4-1.5;1.6-1.7; and 1.8-1.9 of a selected coal. Gasification reactivity has been studied by thermo gravimetric analyzer (TGA) using CO2 as gasifying agent. Surface properties such as, true density apparent density, porosity surface area of different gravity cut samples have also been measured to find out the effect of gravity separation on gasification reactivity.
2 citations
TL;DR: The results of an analysis of the current state of the Moscow Coal Basin and the development of science and technology for the multiple use and conversion of coal into refined energy carriers, products, and materials with new consumer properties are presented in this paper.
Abstract: The results of an analysis of the current state of the Moscow Coal Basin and the development of science and technology for the multiple use and conversion of coal into refined energy carriers, products, and materials with new consumer properties are presented. It is demonstrated that a number of processes and facilities based on the coals and overburden rocks of the basin have been prepared for technical implementation, namely: the generation of heat and power at plants with in-cycle coal gasification; the fluidized-bed combustion of coal in low-power boiler units (50–60 MW); the manufacture of ballast-free humic plant growth stimulators and coagulants for the purification of wastewater and drinking water; and the use of coals and coal mining and benefication wastes as catalytic additives in the process of hydrogenation.
1 citations
TL;DR: In this article, the coal fractionation method proposed by the authors was applied to characterize coals and binders, and it was clarified that the thermoplastic behaviors of the mixture of coal and binder can be explained by focusing on the relative abundance of the fractions in the mixture.
Abstract: Steel industries need to increase the use of low-grade coals in coke making due to the recent rapid increase in coking coal price. To do so, it is necessary to effectively use binders, and it is desired to develop a theory on how to mix coals and binders effectively. In this work the coal fractionation method proposed by the authors was applied to characterize coals and binders. Three different-rank coals and two binders (HPC developed by Kobe Steel and ASP) that were heat-treated at 400°C in advance were separated into several fractions having different molecular weight by sequential solvent extractions at different temperatures up to 350°C. The chemical and physical properties of each fraction were found to be almost independent of the coal and binder types. Then, it was clarified that the thermoplastic behaviors of the mixture of coals and binders can be explained by focusing on the relative abundance of the fractions in the mixture. It is therefore possible to determine an appropriate mixing ratio of coals and binders to realize the thermoplastic behavior required to obtain high-strength coke. This approach can be expected as a new mixing theory which is applicable even to low-grade coals and newly-developed binders.