Determining Optimum Productivity of a Ball Drum Mill When Milling Brown Coals

Ivanov, S. D.; Kudryashov, A. N.; Oshchepkov, V. V.

doi:10.1134/s0040601521010134

Cited by 2 publications

(17 citation statements)

References 4 publications

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Section: Resultsmentioning

confidence: 91%

“…Temperature was found to be one of the most important factors producing a significant effect on the intensity of the thermal decomposition of ODA 33,78–81 . According to the results obtained by Cao et al 80 and Ivanov and Klimanov, 78 in the absence of air, decomposition started at over 450°C and 350°C, respectively. However, according to Dubrovski et al 33 and Martinova et al, 81 thermolysis started at 95°C, which conclusion was reached based on products such as ammonia discovered at that temperature.…”

Section: Resultsmentioning

confidence: 91%

“…Above approximately 500°C, the decrease in the concentration of ODA was slower and at the temperature of 560°C, this concentration was only 7.5% of the initially measured ODA concentration. Ivanov and Klimanov 78 showed that the decomposition of ODA became faster from 300°C and at approximately 450°C almost 99% of the ODA was decomposed, while Babler et al 28 reported that at temperatures over 450°C, a complete degradation occurred. Cao et al, 80 Ivanov and Klimanov, 78 and Babler et al 28 failed to give clear information on the residence time of the ODA at these temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Thermal stability of film forming amines‐based corrosion inhibitors in high temperature power plant water solutions

Vidojkovic,

Mijajlovic,

Lindeboom

et al. 2023

Energy Science & Engineering

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Film forming amines (FFA) are corrosion inhibitors added to power plant water. The major concern associated with their application is the thermal stability in the high temperature power plant water medium, along with the risk of decomposition into low molecular weight organic acids that can cause corrosive damages in the water/steam cycle. However, there is still a lack of sufficient data on the thermal stability of FFA corrosion inhibitors. This paper presents a comprehensive critical review and state‐of‐the‐art assessment of the results obtained from studying the thermolysis of FFA corrosion inhibitors in power plant water/steam cycle conditions, highlighting the relevance for practical application and research needs. Temperature, exposure time, initial concentration, and alkalizing agents were identified as key factors influencing the thermal stability of FFA in high temperature power plant water. Organic acids are found in concentrations harmless to metal tubes. Advanced scientific background information and additional research are required on this topic.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Thermal stability of film forming amines‐based corrosion inhibitors in high temperature power plant water solutions

Vidojkovic,

Mijajlovic,

Lindeboom

et al. 2023

Energy Science & Engineering

View full text Add to dashboard Cite

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“…Mathematical modeling is successfully used to optimize the performance of the ball drum mill when grinding brown coals [5,6]. The segregation index provided in [5] is a result of the experimental study for three different diameters of the drum mill as well as three particle sizes.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The amount of volatiles and ash content have a significant impact on the distribution in a ball drum mill, respectively for fuel grinding, and this was not discussed in this paper. In [6], both grinding and transportation processes are modeled with respective equations. A close look at the equations reveals that energy consumption for grinding is contrariwise proportional to air consumption.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the efficiency of the coal grinding process in ball drum mills at thermal power plants

Kamarova

Abildinova

Terziev

et al. 2022

EEJET

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Ensuring the reliable operation of the dust fuel preparation system at thermal power plants (TPP) is a topical issue since it determines the energy strategy of any country that fires coals for thermal energy production. This unit is one of the most energy-intensive units in TPP. Those systems are outdated, poorly automated and high energy-intensive. Furthermore, they must ensure efficient and safe operation of the facility while being environmentally friendly. The current work focuses on the process of grinding coals in ball drum mills for further pulverized combustion. An experimental study was performed in order to determine the main factors (rotational speed of the drum mill, the degree of loading with the grinding balls, and the velocity of the supplied air) that affect the efficiency of the fuel preparation system. The obtained experimental data and performed mathematical modeling resulted in regression equations describing the energy performance of the mill. Three regression equations for mill productivity, power consumed, and specific surface area of the final product were obtained and validated. The study reveals that the lowest specific energy consumption is achieved when the relative rotational speed of the mill is between 0.81 and 0.87; the weighted average diameter of the balls ranges from 33.5 up to 34.5 mm; the load factor of the grinding media ranges from 0.325 up to 0.335, the supplied air velocity is between 0.2 and 0.3 m/s. The proposed methodology allows adjustment of the operating parameters of the grinding process to achieve the lowest energy consumption. The power consumption for the preparation can be reduced up to 5 % for the selected operation mode of the grinding facility.

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Determining Optimum Productivity of a Ball Drum Mill When Milling Brown Coals

Cited by 2 publications

References 4 publications

Thermal stability of film forming amines‐based corrosion inhibitors in high temperature power plant water solutions

Thermal stability of film forming amines‐based corrosion inhibitors in high temperature power plant water solutions

Improving the efficiency of the coal grinding process in ball drum mills at thermal power plants

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