Showing papers on "Carbochemistry published in 2009"
TL;DR: In this article, the relative merits and limitations of various drying technologies and the current state of their development are presented, and an overview of the diverse processes used for low-rank coal drying is provided.
Abstract: Despite their vast reserves, low-rank coals are considered undesirable because their high moisture content entails high transportation costs, potential safety hazards in transportation and storage, and the low thermal efficiency obtained in combustion of such coals. Their high moisture content, greater tendency to combust spontaneously, high degree of weathering, and the dusting characteristics restrict widespread use of such coals. The price of coal sold to utilities depends upon the heating value of the coal. Thus, removal of moisture from low-rank coals (LRC) is an important operation. Furthermore, LRC can be used cost effectively for pyrolysis, gasification, and liquefaction processes. This article provides an overview the diverse processes—both those that utilize conventional drying technologies and those that is not yet commercialized and hence in need of R&D. Relative merits and limitations of the various technologies and the current state of their development are presented. Drying characteristics ...
266 citations
Journal Article•
TL;DR: In this paper, the status of the development of over-sea large-scale coal gasification technology is summarized and the development trend of and technical approach to commercialization of coal gasifiers are analyzed.
Abstract: Coal gasification is the key technology for clean and high-efficiency coal utilization. It also is the basis of process industry for coal-based chemicals synthesis(such as ammonia,methanol,acetic acid , olefin etc. ), advanced Intergrated Gasification Combined Cycle ( IGCC ) system , poly-cogeneration,hydrogen production,fuel cell and direct-reduction iron making. It is very important to research and develop large-scale coal gasification technology. In this paper,the status of the development of over-sea large-scale coal gasification technology is summarized. And that of research and commercialization of large-scale coal gasification in China is also been introduced. The development trend of and technical approach to commercialization of coal gasification are analyzed.
23 citations
TL;DR: In this article, the influence of mechanically activated methods at coals grinding on their chemical activeness at combustion and gasification has been determined, which enables development of new highly boosted processing methods for coals with various levels of metamorphism.
Abstract: Combustion and air gasification of mechanically activated micro-ground coals in the flux have been studied. Influence of mechanically activated methods at coals grinding on their chemical activeness at combustion and gasification has been determined. Intense mechanical activation of coals increases their chemical activeness that enables development of new highly boosted processing methods for coals with various levels of metamorphism.
10 citations
TL;DR: In this paper, a fluidized bed of iron-containing materials, which are able to catalyse the volatives oxidation provides the autothermal conditions of coal carbonization without the formation of harmful polycyclic compounds and pyrolysis tars.
8 citations
TL;DR: In this paper, a devolatilization process of entrained coal gasification is predicted by a CPD model, which could describe the chemical structure of coal based on the chemical properties of the coal.
Abstract: Integrated Coal Gasification Combined Cycle (IGCC) power plants have been developed to reduce carbon dioxide emissions and to increase the efficiency of electricity generation. A devolatilization process of entrained coal gasification is predicted by CPD model which could describe the devolatilization behavior of rapidly heated coal based on the chemical structure of the coal. This paper is intended to compare the mass release behavior of char, tar and gas(CO, ) for three different coals. The influence of coal structure on gas evolution is examined over the pressure range of 1030atm.
2 citations
TL;DR: In this paper, semi-and non-coking coals were blended with coking bituminous coals in varying proportions and an estimation was made as to their stability factors through petrographic techniques.
Abstract: Turkey, especially Zonguldak on the West Coast of Black Sea region, has large reserves of bituminous coal that can be used either directly or in blends with other coals for metallurgical coke production. It is possible to predict the coking properties of these coals by petrographic analysis. In this study, semi- and non-coking coals were blended with coking bituminous coals in varying proportions and an estimation was made as to their stability factors through petrographic techniques. It was established that semi- and non-coking bituminous coals could be used in the production of metallurgical coke.
2 citations