Utilization of solid wastes from the gasification of coal-water slurries

Shpirt, M. Ya.; Goryunova, N. P.

doi:10.3103/s0361521909040119

Cited by 3 publications

(3 citation statements)

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“…A disadvantage of the traditional technology of lignite coal briquetting is loss of fuel material as slurry disposal outside factories due to the lack of closed-loop water-slurry cycle [9][10].…”

Section: Unsolved Aspects Of the Problemmentioning

confidence: 99%

Techniques and Technology of Waste Disposal of Lignite Briquettes

Krivoschokov

KUSHNIRUK

Скляр

2020

KEM

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Development of a waste-free technology for lignite slurry upgrading at briquetting factories, which provides for getting cleared water for closed-loop water supply and transportable product for burning or briquetting with sustainable equipment application. Detection and study of peculiarities of lignite coal and slurry of briquetting factories, as well as research on slurry surface properties for substantiating a separation ratio. Determination of the separation ratio of lignite coal slurry taking into account its surface properties to estimate technological efficiency of reagentless flotation separation. Research on kinetics of settling and influence of different flocculants on efficiency of the slurry thickening process for sludge collection and getting circulating water. Development of waste-free technology for lignite slurry upgrading with the purpose of slurry recycling based on the substantiation of rational technological parameters and appropriate equipment. Regularities of the process of reagentless flotation separation of lignite coal slurry, kinetics of settling are defined, which is the basis of technological solutions on separate briquetting waste treatment. A waste-free technology for upgrading lignite slurry and cinders with closed-cycle of water supply and transportable final product for burning and briquetting with moisture content of 26% ... 28 % is developed. Floating and sinking fractions of lignite slurry are studied and necessity of separate treatment of these fractions is substantiated. Kinetic regularities of deposition of heat-treated lignite particles are determined; rational modes which provide for efficient deposition of particles of the sinking fraction with minimum flow of a flocculant are defined. A phenomenon of hydrophobic behaviour of mineral particle surface after heat treating and briquetting of lignite coal is revealed, which is taken as a separation ratio; this allowed substantiating the waste-free technology for lignite slurry upgrading through reagentless flotation separation. The practical value of the results obtained involves development of a waste treatment technology at a briquetting factory (slurries and cinders) and its conversion into closed-loop water supply, which will allow obtaining 23 t/year of transportable final product additionally as well as decreasing consumption of pure water considerably and eliminating environment pollution.

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Section: Unsolved Aspects Of the Problemmentioning

confidence: 99%

Techniques and Technology of Waste Disposal of Lignite Briquettes

Krivoschokov

KUSHNIRUK

Скляр

2020

KEM

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“…The development of new technologies for industrial thermal power engineering will allow large-scale utilization of the numerous combustible wastes of coal enrichment and oil refining, which has not been demanded so far. Thus, expansion of the fuel base due to the involvement of industrial waste is one of the current trends in the development of thermal power engineering. , In this case, it is possible to create effective composite fuels. Such fuels, depending on the component composition, are called coal–water slurries (CWSs) or CWSPs.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, expansion of the fuel base due to the involvement of industrial waste is one of the current trends in the development of thermal power engineering. 14,15 In this case, it is possible to create effective composite fuels. Such fuels, depending on the component composition, are called coal− water slurries (CWSs) or CWSPs.…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Model for Processes in Coal–Water Slurries Containing Petrochemicals under Heating

2018

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One of the promising directions for improving the environmental, technical, and economic efficiency of coal-fired thermal power plants is the use of the multicomponent fuels based on coal and combustible liquids. Such fuels, as a rule, are called coal–water slurries containing petrochemicals (CWSPs). The typical wastes of coal enrichment, low-grade coals, oil production, and oil refining wastes as well as used flammable liquids, for example oils, can be included in the fuel composition. To date, mathematical models have not been developed for predicting the effective conditions for the ignition of promising CWSPs at minimum ambient temperatures and with short ignition delay times. This problem was solved in the present work. On the basis of the experimental results, three modes of physical and chemical transformations were established when heating single particles of the composite fuel. The first one is the intensive thermal decomposition of the coal component after evaporation of the liquid components of the fuel. Then goes the gasification of coal under the boiling conditions of the liquid components followed by the heterogeneous combustion of the solid residue. The third mode is the ignition of the gas mixture in the vicinity of the fuel particle and initiation of heterogeneous combustion of the solid residue. The temperature ranges of the environment were determined under which the detected modes of the physical and chemical transformations occur. The obtained experimental data became the basis for the development of a predictive mathematical model of the transformations that occur when heating a composite fuel with different characteristics of the components. It takes into account the interrelated physical and chemical processes: inert heating, evaporation, thermal decomposition, and exothermic reaction. The developed mathematical model and the results of the theoretical studies make it possible to establish the influence of the characteristics of the fuel components and the conditions of its heating on the three identified modes of physical and chemical transformations.

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