Effect of coal quality on maintenance costs at utility plants. Final report. [Effect of ash and sulfur content of coal]

Application of stochastic models for mine planning and coal quality control

Thermal Science ◽

10.2298/tsci130201031s ◽

2014 ◽

Vol 18 (4) ◽

pp. 1361-1372 ◽

Cited By ~ 1

Author(s):

Dejan Stevanovic ◽

Bozo Kolonja ◽

Ranka Stankovic ◽

Dinko Knezevic ◽

Mirjana Bankovic

Keyword(s):

Quality Control ◽

Power Plant ◽

Sulfur Content ◽

Random Variable ◽

Complex Problem ◽

Mine Planning ◽

Coal Quality ◽

Mine Site ◽

Variable Nature

The power plant owner is interested to know in advance the quality of coal to be burnt which should meet maximal efficiency of power plant and the environmental regulations. There is the need to control and to predict the quality of coal at the mine site to meet sulfur emission requirements. Coal quality control between the mine site and the utility plant is a complex problem owing to the variable nature of coal properties (heating value, sulfur, ash), even within the same coal seam. Due to the fluctuation of the coal quality, mine planning and coal homogenization are in fact an optimization problem under uncertain conditions. To deal with these issues a stochastic optimization model is developed for an illustrative coal homogenization problem. Mining block grades from an optimized mining schedule are used to simulate any given homogenization process in stockpiles throughout the mine`s life. Sulfur content is treated as lognormally distributed random variable. The objectives of the model include minimizing the expected sulfur content and standard deviation in sulfur content. The methodology was illustrated using the case study on Kolubara surface coal mine.

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Study on SO3 emission test of typical ultra-low emission coal-fired units in western region of Inner Mongolia

E3S Web of Conferences ◽

10.1051/e3sconf/202130002004 ◽

2021 ◽

Vol 300 ◽

pp. 02004

Author(s):

Meng Wang ◽

Zhiyong Zhang ◽

Suhua Hao ◽

Yu Wu ◽

Zhiqiang He

Keyword(s):

Sulfur Content ◽

Inner Mongolia ◽

Western Region ◽

Test Results ◽

Coal Quality ◽

Condensation Method ◽

Low Emission ◽

Treatment Facilities

To study the effect of types of boilers, pollutant treatment facilities and coal quality on SO3, emission concentration of SO3 was tested by controlled condensation method for seven typical ultra-low emissions coal-fired units in western region of Inner Mongolia. The test results showed that the SO3 emission concentration of all units ranged from 0.36 mg/m3 to 2.04 mg/m3, much lower than 5 mg/m3, so there was no need to add SO3 removal facilities. For the units burning the coal of same sulfur content, which adopt LLTESP and WESP has the lower SO3 emission concentration. The SO3 emission concentration can also be controlled at a lower value when SNCR and double-tower double-cycle WFGD technology are adopted in the unit burning medium-high sulfur coal.

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