The Development of Environmentally Friendly Technologies of Using Coals and Products of Their Enrichment in the Form of Coal Water Slurries

Murko, V. I.; Hamalainen, Veniamin

doi:10.1051/e3sconf/20172101029

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Существенное снижение времени задержки зажигания Минеральные примеси (в том числе оксиды металлов) [56] Теплоемкость ВУС уменьшается с увеличением содержания минеральных добавок Фильтр-кек [57] Сокращение объемов отходов углеобогащения, снижение выбросов оксидов серы в дымовых газах Наноматериалы (углеродный наноматериал, обезвоженный карбонатный шлам) [58] Улучшение реологических свойств ВУС…”

Section: твердое отходы лесопереработки [55]unclassified

Coal-water suspensions: preparation, properties, characteristics (a brief overview)

Zenkov,

Gvozdyakov

2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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RELEVANCE. A review of the current state of research on coal-water slurries in Russia and abroad is presented. Coal-water slurries are promising alternative types of energy fuels. Their use in the energy sector will allow generating thermal and electrical energy. It is possible to use a fairly wide range of substances as components of such fuels. One of the preferred types are various waste. The analysis of modern literature has shown a fairly wide range of directions for the study of multicomponent coal-water slurries.THE PURPOSE. To provide information on the current state of research in the field of technologies for the preparation, spraying and combustion of coal-water fuels, as well as on existing and promising additives to such slurries.METHODS. The study was carried out by the method of collecting and structuring information.RESULTS. The review of the current state of research in the field of technologies for the preparation, spraying and combustion of coal-water fuels, as well as existing and promising additives to such slurries, was carried out. It was found that additives of liquid combustible waste and biomass contribute to reducing the ignition delay time. At the same time, such additives do not reduce the quality characteristics of spraying multicomponent coal-water slurries. A number of components reduces the amount of emissions of combustion products of such fuels into the atmosphere. The influence of additives and components of coal-water slurries on their characteristics and properties was analyzed. It was shown that liquid components contribute to the intensification of ignition and combustion processes. In addition, their introduction into the fuel composition has a positive effect on the rheological properties of slurries, the characteristics of their spraying, combustion and the concentration of harmful emissions.CONCLUSION. Coal-water slurries are promising alternative types of energy fuels. The introduction of combustible components into the composition of coal-water slurries can significantly improve the rheological properties, which can improve the storage and transportation characteristics of such fuels. The established positive characteristics and properties of coal-water slurries provide prerequisites for the full-scale introduction of such fuels into industrial power engineering.

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Section: твердое отходы лесопереработки [55]unclassified

Coal-water suspensions: preparation, properties, characteristics (a brief overview)

Zenkov,

Gvozdyakov

2023

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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“…Fly ash (up to 50%), carried away from the furnace with hot flue gases is trapped in the dust collector, and the remaining ash part in the form of slag falls on the grate. Under such conditions, the difference in the chemical-mineralogical composition of fly ash from the chemical-mineralogical composition of the ash of the initial fuel is insignificant [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Use of Ash-and-Slag Wastes after Burning of Fine-Dispersed Coal-Washing Wastes

Murko

Khyamyalyainen

Baranova³

2018

E3S Web Conf.

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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.

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Experimental studies of the influence of pressure of slurry fuel and air on the spray cone structure during atomization

Gvozdyakov

Zenkov

Губин

et al. 2019

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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Results of experimental studies of pneumomechanical atomization process of slurry fuel with a plasticizer in an aerodynamic simulator of power boiler furnace are presented. Analysis of the current state in the field of research of slurry fuel atomization processes has been conducted. Influence of pressure of slurry fuel and air on the structure of the emerging spray cone have been analyzed. The values of characteristic dimensions of three zones of spray cone have been determined: core, middle and outer zones. Effect of pressure of the sprayed slurry fuel and air on the period of stable spray cone formation and geometric characteristics of the zones has been experimentally confirmed. Ranges of velocities and sizes of droplets in the flow at various pressures have been distinguished. The quantitative values of slurry fuel droplets with different velocities in the process of its pneumatic spraying have been obtained. It has been established that the largest number of particles in the study area have velocities up to 8 m/s; a significant number of droplets (up to 20%) have velocities from 8 to 32 m/s; velocities of 32 m/s and more are typical for 1% of droplets. During the results processing, aerosol particles with a size of 1 micron or less have not been taken into account. The values of We criterion for the respective sizes and velocities of the sprayed fuel droplets have been determined. It has been established that significant part of the droplets undergoes catastrophic crushing, which is characteristic for the values of We numbers from 7800 and higher. The obtained results can be used for mathematical and physical modeling of the process of slurry fuels atomization in the furnaces of power boilers in order to predict the aerodynamic characteristics of the designed and existing units.

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The Development of Environmentally Friendly Technologies of Using Coals and Products of Their Enrichment in the Form of Coal Water Slurries

Cited by 3 publications

References 4 publications

Coal-water suspensions: preparation, properties, characteristics (a brief overview)

Coal-water suspensions: preparation, properties, characteristics (a brief overview)

Use of Ash-and-Slag Wastes after Burning of Fine-Dispersed Coal-Washing Wastes

Experimental studies of the influence of pressure of slurry fuel and air on the spray cone structure during atomization

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