Assurance of guaranteed atmosphere air quality for a point emission source

Polishchuk, S; Falko, V; Polishchuk, A. V.; Demydenko, A

doi:10.33271/mining13.02.103

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Theoretical models of combustion stability [39], [40], despite the complexity and multifactorial process nature, are only in qualitative agreement with experimental data [41]. Therefore, in practice, experimental data obtained from bench or industrial tests of burners with various designs are used to determine the flame stabilization limits [42].…”

Section: Methodsmentioning

confidence: 99%

Research into limits of gas-fired burners flame stabilization in the flue gas recirculation

Ivanov¹,

Polishchuk²,

Holiakova³

et al. 2020

Min. miner. depos.

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Determining the flue gas recirculation effect on the verge of the gas-fired burners flame stabilization based on experimental industrial research. Methods. The studies were conducted on a circular heating furnace with a diameter of 30 m of the Interpipe NTRP wheelrolling workshop. The furnace for blanks heating to 625 ± 25°C with their isothermal holding has 5 zones with an adjustable and systematic supply of natural gas. To increase the thermal performance efficiency, the furnace has been equipped with an external exhaust gas recirculation system. When assessing the burners forcing ability of the after their ignition, the gas consumption, as well as recycled gas consumption was increased gradually in a predetermined ratio. Therewith, gas consumption was determined at the time of the flame-out, which was recorded visually. Findings. Based on a comprehensive analysis, the factors have been revealed, which affect the sustainability of the burner operating modes when exhaust flue gases are fed into the combustion zone. It is shown that the most rational for analyzing the recirculation influence on gas combustion stability is the use of criterion empirical models that take into account the complex of physical-chemical characteristics of the reagents, parameters of the combustion mode, gas-dynamic and design burner peculiarities. A criterion model has been obtained for the loss of a diffusion flame in combined "pipe-in-pipe" type burners when burning gas fuel in a medium of recycle flue gases with a temperature of 140-200°C and an oxygen composition of 15.4-19.6% in them. Dependences have been determined for assessing the expansion of combustion stability limits with a change in the coefficient of the oxidising agent consumption, its temperature, and the recirculation ratio. Originality. New computational models have been obtained for assessing the limits of the flame stabilization of straightflow gas burners during flue gas recirculation. The ratios have also been found of the recirculation ratio and the oxidising agents temperatures, that provide the conditions of their identical work for the flame-out and flame backflash when replacing the air with recycled gas for fuel combustion. Practical implications. The results make it possible to make a reasonable choice of burners and combustion standard parameters that ensure the safe unit operation during flue gas recirculation.

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Section: Methodsmentioning

confidence: 99%

Research into limits of gas-fired burners flame stabilization in the flue gas recirculation

Ivanov¹,

Polishchuk²,

Holiakova³

et al. 2020

Min. miner. depos.

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“…Moreover, Polishchuk et al in [3] defined the problem of assessing the guaranteed atmospheric air quality for a point source. Such point(s) can be defined in various fields such as mining, metallurgy, chemistry etc., but are always described as a vector random field and a variable with multidimensional distribution density.…”

Section: Introductionmentioning

confidence: 99%

Relation between air and soil pollution based on statistical analysis and interpolation of Nickel (Ni) and Lead (Pb): Case study of Zagreb, Croatia

Račić¹,

Malvić²

2023

Min. miner. depos.

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Purpose. This paper focuses on the comparison of Ni and Pb concentrations in air and soil pollution in the Zagreb area. Due to the very limited amount of publicly available data from soil analysis samples, 2016 and 2019 were chosen as the best possible indicators of related changes in metal concentrations in soil and air. Methods. Testing the normality of Ni and Pb concentrations in the total deposited matter (TDM) confirmed the feasibility of using two parametric statistical tools – the Pearson correlation coefficient and the t-test. The Inverse Distance Weighting (IDW) interpolation method was selected as the best approach for a small number of measurements. Findings. The insufficient amount of data is the main shortcoming for urban health policy in a large area like Zagreb. The small number of air measurement stations and especially soil sampling sites cannot lead to any reliable conclusions about urban pollutants, their activity over time and direct links to soil toxic degradation based on statistical or geological methods and analyses. However, there is no doubt that urban pollution sources fill the soil with accumulated toxic elements such as Ni and Pb, especially in suburban areas located along the paths of the dominant wind directions. Originality. This is an original research that for the first time statistically analyzes and maps publicly available air and soil pollution data for the period 2016-2019. Practical implications. This research is a necessary step in determining the future planning of air and soil measurement stations in the Zagreb urban area.

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Improving the geometric topology of geothermal heat exchangers in oil bore-holes

et al. 2019

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A review has been conducted of key trends in the development of geometric topology of geothermal heat exchangers. Authors proposed approaches to improving the designs and network structures for heat-transfer media circulation in the bottom-hole space of oil-and-gas reservoirs. Four geometric topologies of geothermal heat exchangers have been analysed: І – ІІ – rectilinear vertical smooth and finned pipelines; ІІІ – IV – a cluster in the form of a set of smooth and finned single-pipe elements, representing a figure of “squirrel wheel” or “meridian sphere” type. It is shown that the most effective technical solution, which ensures the increase in the coefficient of performance (COP) of bore-hole geothermal systems is finning the heat exchanging pipes. For the heat exchangers of І – ІІ type, the calculated increase in COP in comparison with smooth pipes is 40%, and for ІІІ – IV type – 95%. The key parameters influencing the COP of a geothermal heat exchanger are: the radius of fluids draining out during the heat exchange process, the radius of pipelines with circulating heat-transfer medium, the diameter of a cluster heat exchanger, the heat exchange area, the parameters of rocks thermal resistance in the bottom-hole zone of heat-receiving.

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Assurance of guaranteed atmosphere air quality for a point emission source

Cited by 3 publications

References 19 publications

Research into limits of gas-fired burners flame stabilization in the flue gas recirculation

Research into limits of gas-fired burners flame stabilization in the flue gas recirculation

Relation between air and soil pollution based on statistical analysis and interpolation of Nickel (Ni) and Lead (Pb): Case study of Zagreb, Croatia

Improving the geometric topology of geothermal heat exchangers in oil bore-holes

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