-It is shown that use of coal-water slurry fuel (CWF) is most preferable for reduction of sulfur oxide content during combustion of coal fuel by feeding of sulfur capture agents (SCA) in the burning area. The technique of thermodynamic analysis of chemical reactions in the process of CWF burning was developed. In this case, the optimal temperature conditions have been determined as required for the effective reduction of sulfur oxides in flue gases when using different types of SCA. According to the results of calculating the composition of CWF combustion products when entering various substances in the burner space as SCA it has been determined that magnesite, calcite, and dolomite are the most effective natural minerals. The reliability of the results obtained is confirmed by experimental studies of burning CWFs prepared from Bulgarian high-sulfur coal Keywords-sulfur capture agent; water-coal slurry fuel; thermodynamic analysis; vortex combustion of coal fuel
Abstract. It is shown that an effective way of burning high sulfur coal is to burn coal-water slurry fuel (CWF) prepared on its basis containing a sulfur capture agent (SCA) entered in the slurry at the stage of preparation. The technique of thermodynamic analysis of chemical reactions during CWF burning has been developed including burning in the presence of SCA. Using the developed calculation program, the optimal temperature conditions have been determined as required for the effective reduction of sulfur oxides in flue gases when using different types of SCA. According to the results of calculating the composition of CWF combustion products when entering various substances in the burner space as SCA it has been determined that magnesite, calcite, and dolomite are the most effective natural minerals. The analysis of calculated and experimental data proves the efficiency of SCA addition as well as validity of the obtained results.
Abstract. Effective utilization of ash-and-slag waste generated by coalfired power plants can help significantly to reduce the negative impact on the environment and improve their economic performance. Studies have been made of the mineralogical composition of ash-and-slag wastes obtained after the combustion of water-coal fuel based on fine-dispersed coal-washing waste (filter cake) in a specially designed boiler with a vortex combustion system. The possibility of effective use of ash-and-slag wastes for the production of building materials, primarily mortar mixes, widely used for mining works on mine openings, laying the worked out space, etc. (high content of silicon oxide and aluminum oxide is combined with a low carbon content in other words a negligible unburned carbon loss). The optimum percentage ratio of the initial components of the filling mixture based on ash-and-slag wastes and crushed rock (granulated slag) has been established. The results of experimental tests of hardening tabs on the strength under uniaxial compression are presented. It has been established that a sample containing 18% of ash-and-slag wastes, 33% of a granulated slag and 19% of cement, corresponds to the required technological parameters for the strength and cement content.
A serious problem for coal production is the environmentally friendly utilization of coal mining waste and coal enrichment. In different countries, the best specialists in this field are trying to find the solution of this problem. In the United States, France and China, the technology of preparation and burning of water-coal suspensions (WCS) for the utilization of fine-dispersed wastes of coal enrichment and coal slurries has been successfully used. A boiler with a thermal capacity of 0.63 MW with a vortex combustion system efficiently operating on fuel from coal waste was designed, manufactured and tested. The results of the operation of the boiler on this fuel showed its high efficiency (the efficiency is 83-86%) with the level of harmful emissions in the flue gases below the permissible values Keywords-ash-and-slag wastes, fine waste of coal enrichment, a boiler with a vortex combustion system
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