Characteristic of Possible Obtained Products during the well Underground Coal Gasification

Dychkovskyi, Roman; Shavarskyi, Jaroslav; Cabana, Edgar Cáceres; Smoliński, Adam

doi:10.4028/www.scientific.net/ssp.291.52

Cited by 8 publications

(9 citation statements)

References 29 publications

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“…Many teams around the world are developing "green" technologies for coal mining, aimed at reducing the volumes of waste generation and pollutant emissions into the atmosphere, as well as improving the energy quality of coal products. In particular, a number of publications in recent years have been devoted to improving the quality of mined coal and reducing its losses [25]- [27]. The works of the authors in [28], [29] are aimed at finding a more perfect technology for stope operations.…”

Section: Introductionmentioning

confidence: 99%

Granulometric composition research of mine rocks as a material for backfilling the mined-out area in coal mines

Petlovanyi¹,

Malashkevych²,

Sai³

et al. 2021

Min. miner. depos.

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Purpose. Determination of the granulometric characteristics and loosening coefficient of mine rocks formed during stope operations from undercutting the bottom rocks as a potential backfill material based on a set of mine and laboratory research. Methods. To do research, a complex methodology is used, which includes a photographic surveying the mass of destroyed rocks from undercutting the bottom rocks in mine conditions, digital processing and determining the granulometric composition in the software package, sampling the mine rocks at the surface complex, and reconstructing the granulometric composition, similar to the full-scale mine conditions in the laboratory. Sieve analysis, laboratory balance and laboratory container are used to determine the granulometric composition and loosening coefficient. Findings. The dependence between the granulometric composition and loosening coefficient of rocks, which increases by 33% within fractions of 0-50 mm and by 8% within fractions of 50-140 mm, has been revealed. It has been determined that the destroyed rocks in the face within fractions of 0-140 mm have a bulk density of 1.28 g/cm3, loosening coefficient of 1.7, the voidness of and the maximum reserve for the backfill mass compaction with mine rocks is 41.9%. An analytical assessment of the volumes of the formed cavities of the mined-out area in the longwall face and gobed mine workings, as well as the prospects and completeness of their filling with mine rocks have been performed. Originality. It has been determined that the loosening coefficient of mine rocks destroyed in the stope face by KA-200 shearer changes according to the logarithmic dependence on their granulometric composition. This makes it possible to control the granulometric characteristics of the backfill material to achieve the maximum density of the backfill mass. Practical implications. Further research can serve as a basis for determining the rational parameters for the formation and placement of backfill masses during complex-mechanized selective mining of coal seams using various methods of backfilling operations.

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Section: Introductionmentioning

confidence: 99%

Granulometric composition research of mine rocks as a material for backfilling the mined-out area in coal mines

Petlovanyi¹,

Malashkevych²,

Sai³

et al. 2021

Min. miner. depos.

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“…In our previous studies attention was paid to different cogeneration technologies conducted with the mining enterprises operation [24,30,[36][37][38][39]. The specialized literature [37,[40][41][42][43][44] pays attention to the application of joint technological plants which means the usage of different renewable.…”

Section: Development Of Joint Technologies For the Geoenergy Usage Based On Gas Hydrates Transformationmentioning

confidence: 99%

“…mines, open casts, coal-preparation plants, thermal power stations, nuclear power stations etc.) should not be reconstructed with billions of expenses; it is more expedient to develop environmentally friendly activities on the basis of underground coal gasification which will provide stability and health of the environment [30,67,68]. Coal seam gasification is aimed at harmonious interaction between community and nature, human and environment as well as environmental improvement.…”

Section: Development and Application Of The Energy-saving Hydrating Complexmentioning

confidence: 99%

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Gas hydrates technologies in the joint concept of geoenergy usage

et al. 2021

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The paper represents the analysis, which has helped to establish the usage of gas hydrate technologies in the methane conversion. This gas could be obtained in different ways. Possibilities and sources for the gas obtaining have been demonstrated. Use of other environmentally friendly sources to support operation in such systems in terms of joint energy complex has been considered. The necessary kinetic connections to provide operational sustainability of all the constituents have been given. The approach helps evaluate quantitatively the priority of its physicochemical transformations to obtain gas hydrates artificially. It is possible to transport methane at considerable distances when it is solidified. Actually, in this case there is no necessity to build costly compressor stations and pipelines for its transportation to consumers. The approach is extremely important for mining regions as it helps prolong the operating period and working out of the abandoned and off-balance coal reserves. In this case, it is proposed to apply special gasification technologies tending to maximum methane recovery. The proposed solutions give the possibility to define the trends of our further research. They will be highlighted in the following authors’ studies.

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“…Efficiency of the gasification processes may be also increased considerably by using corre sponding catalysts, helping to reduce the temperature in terms of the preservation of high process rate and regulate the prod uct composition. The most widespread catalysts of the coal gasification process are as follows: compounds of alkaline, al kalineearth, and some transition metals (ruthenium (Ru), cobalt (Co), ferrum (Fe), and nickel (Ni) [12]) and potassium carbonates (K 2 CO 3 , Na 2 CO 3 , CaCO 3 [13]). The mentioned compounds are rather limited in terms of their mass produc tion and quite costly to be used as an intermediate product while forming gaseous powergenerating fuel during the coal gasification.…”

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confidence: 99%

Efficiency of underground gas generator in consideration of the reverse mode

Saik¹,

Falshtynskyi²,

Lozynskyi³

et al. 2020

Nauk. visn. nat. hirn. univ.

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effIcIency of unDerGrounD GAs GenerAtor In consIDerAtIonof the reverse MoDe purpose. Activation of the processes of well underground coal gasification with the consideration of the reverse mode of the underground gas generator based on the balanced state between the oxidizing and reducing zones of the fire face.Methodology. The underground gas generator efficiency was evaluated based on the analytical and laboratory studies. Analyti cal substantiation of the implementation of reverse operations in terms of the underground gas generator is based on the quantita tive parameters of coal gasification in the oxidizing and reducing zones of the underground gas generator and their advance rates. Laboratory studies were carried out on a stand unit with the modeling of the coal gasification processes.findings. Efficiency of the underground gas generator operation by reversing with blowing mixtures has been substantiated, which helps to maintain the balance between its oxidizing and reducing zones. Time periods for the reverse operations have been identified on the basis of the averaged value of concentrations of the combustible generator gases on the outlet from the modeled underground gas generator.originality. Dependences of the changes in displacements of the active underground gas generator zones in terms of the imple mented reverse of blowing mixture supply have been obtained with the consideration of mining and geological conditions of the occurrence of coal seam c 6 of Solenivska site of Donets coalfield. Parameters of the temperature field distribution around the fire face of the underground gas generator have been identified. Correction coefficient (k v ) has been determined, which helps to obtain the data on the advance rate of the oxidizing zone of the underground gas generator with the use of "MTB WUCG" software. practical value. A design of the laboratory stand unit for coal gasification has been improved, which simplifies the control of technological processes while studying gasification modes. Operating efficiency of the underground gas generator with the transi tion to the reverse mode has been substantiated on the basis of energy balance of the active zones of the reaction channel and composition of the generator gas.

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Characteristic of Possible Obtained Products during the well Underground Coal Gasification

Cited by 8 publications

References 29 publications

Granulometric composition research of mine rocks as a material for backfilling the mined-out area in coal mines

Granulometric composition research of mine rocks as a material for backfilling the mined-out area in coal mines

Gas hydrates technologies in the joint concept of geoenergy usage

Efficiency of underground gas generator in consideration of the reverse mode

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