Papers by Keyword: Coal Gasification

Abstract: This article is a summarizing of the results of the author's team on the establishment of technological parameters of underground gasification. It provides a justification of the final chemical and energy products that can be obtained as a result of complex physical and chemical transformations of coal. The thermodynamic processes of formation of the gasification source when changing the composition of the blast furnace mixture and the modes of its application to the georeactor are considered. Moreover, the change in the stress-strain state of rocks depending on the composition of the lateral rocks is taken into account. To better ensure the results are consistent with the well-known principles of thermodynamics and phase formation under the influence of the temperature field and the main chemical reactions occurring in complex gasification processes are presented. The main phase transitions in the georeactor are given for the maximum reception of different energy gases. Particular attention is given to the formation of an appropriate relationship between hydrogen and carbon monoxide, which form a synthesis gas. The Anderson-Schultz-Flory reaction is used to determine the maximum CO concentration in the outlet mixture. In general, the system for determining the material and thermal balance is proposed. These approaches were checked both for working out the coal reserves and for utilization of the mining waste products. Results of this investigation were included to the Roman Dychkovskyi thesis of the scientific degree of the Doctor of the Technique Sciences “Scientific Principles of Technologies Combination for Coal Mining in Weakly Metamorphoses Rockmass”. Also, this results were partially presented on international scientific and practical conferences “Forum of Miners” from different years. They contain the researches, which were conducted within the project GP – 489, financed by Ministry of Education and Science of Ukraine.

Abstract: The formation of the stress-strain state of rocks in the several phase gasification processes was considered. Proceeding from the well-known principles of thermodynamics and phase formation of the multi-type rockmass under the influence of the temperature field, a geomechanical model of a two-layer artificially-formed shell formed during the gasification process by the method of variation feeding of the blowing mixture to the body of the gas generator was developed. The Neumann principle is used for the magnitude determination of the maximum stress vector, which involves the definition of the axial tensor of mechanical deformations through the anisotropy of the thermal expansion (the polar tensor of the second rank). This makes the possibility to create the base for a package of information programs creation. Such programs give the possibility to simplify the study of the rockmass deformation characteristics and to evaluate the stresses in a thermally changing environment. Researches are carried out by creating the final element system with the adaptation to the specific mining-geological conditions. These approaches are checked both for working out the coal reserves and for utilization of the mining waste products. Results of this investigation were included to the Roman Dychkovskyi thesis of the scientific degree of the Doctor of the Technique Sciences “Scientific Principles of Technologies Combination for Coal Mining in Weakly Metamorphoses Rockmass”. They contain the researches, which were conducted within the project GP – 489, financed by Ministry of Education and Science of Ukraine.

Abstract: Energy efficiency of coal gasification with possible utilization of mining wastes within ecologically closed gas generator cycle has been considered. Technical and technological performance of such gas generator and mechanism of material and heat balance on the basis of the available analytical methods and practices as well as the developed author software have been proposed. Heat carrier formed in the process of coal gasification has been used for the utilization. Temperature of the utilization process within the industrially expedient limits being supported with the help of either activation or attenuation of the gasification process. After specific treatment, organogenic waste and domestic wastes are utilized by means of thermal decomposition within a gas generator. Economic evaluation of the proposed means confirms the expediency of their implementation in mines with industrial and balanced coal reserves as well as within the areas where this energetic source has already been already mined out. Results of this investigation were partially presented on international scientific and practical conference “Forum of Miners - 2017”. They contain the researches, which were conducted within the project GP – 489, financed by Ministry of Education and Science of Ukraine.

Abstract: To determine the quantities and the treatment ways of coal gasification methanol production residues, questionnaire survey and field investigation were carried out in this research. Moreover, the distribution characteristics of PAHs in two typical residues were determined by GC-MS technique, according to USEPA8100 method. The outputs of gasifier slag and boiler ash for were 127,494 t/a and 164,850t/a, respectively, all the boiler ash and 80% of the gasifier slag would be reused for brick-making. Coal tar residue, with the yield of 480 t/a, was always delivered to coke plant for coking, which was a effective measure to save energy and solve the environmental issues caused by the storage of this residue. The results indicated that the concentration of PAHs with 5-6 aromatic rings was 905 mg/kg in coal tar residue, accounting for 9.23% of the total PAHs concentration, its Benzo (a) pyrene concentration was 160 mg/kg, making it a major health hazard. The concentration of PAHs in gasifier slag was 189mg/kg and the PAHs with 2-3 aromatic rings accounted as high as 81.41% of the total PAHs concentration, the PAHs with 5-6 aromatic rings made up only 1.1%. TheBaPeq were 322.9 mg/kg and 0.23 mg/kg for coal tar residue and gasifier slag, respectively.

Abstract: With starch and NaOH, CaO as raw materials, the type of coal gasification catalyst prepared with mixed, the effects of different additive ratio on the viscosity, mechanical strength, thermal stability, chemical reactivity. The results show that the catalyst can improve the briquette indicators, play a good catalytic effect on the gasification of coal briquette, in 10% of the amount of catalyst, the effect of the additive is used in an amount 30% optimal.

Abstract: The vaporization and liquefied coal has important value to answer oil crisis for us, in technological chain support ,The coal chemical industry chain extension dependent on coal chemical industry innovation service system construction. In this paper,the author settled the coal chemical industry and technological innovation service system construction of research and development present situation, puts forward a ultimate extension of the technological chain is mature coal gasification technology, in industry chain the core industry is coal gas industry in the future,While improving the coal chemical industry innovation service system can effectively support technological chain the realization of the goal technique, also can promote the formation of the core industry chain.

Abstract: The volatilization behavior of Seleenium in coal / coal char was studied by determining the concentration of Se with AFS at H₂O(Ar) atmosphere in high-temperature tube furnace. The inhibition effects on the volatilization of Se with calcium-based material (CaO) and nano materials Fe₃O₄ as absorbents were studied during coal gasification. The results show that the volatilization rates of Se, rising with the temperature of gasification, can be effectively controlled with the absorbent of CaO. Because CaO can reacts with Se produce CaSeO₄, a more stable compoud. Nano-Fe₃O₄ can enhance the ability of CaO to inhibit the volatilization of selenium, it is because not only can promote more CaSeO₄, while also reducing the possibility of its decomposition.

Abstract: At present, molten blast furnace slag is quenched rapidly using a large amount of water to produce a glassy-granulated slag without any recovery of its much sensible heat, polluting water and atmosphere. To solve these problems, a new heat recovery system is proposed. This system consists of melting gasifier, the 2nd gasifier and boiler in order to achieve stepped energy using. The melting gasifier and the 2nd gasifier use the endothermic heat of gasification reaction instead of sensible heat to recover the energy of molten blast furnace slag. The possibility of the new heat recovery system is studied. The reactions in melting gasifier are studied using STA409PC thermal analyzer and HSC chemistry software. The economic and environmental benefits are calculated based on the heat and mass balances. The results indicate that this method is possible and better than conventional methods such as hot water or steam production. The molten BF slag acts as not only thermal media but also good catalyst. The efficiency of melting gasifier is high and without pollution. Besides, this method can bring huge economic and environmental benefits which are important to the survival and sustainable development of iron-steel enterprises.