Mathematical and physical modeling of the coal–water fuel particle ignition with a liquid film on the surface

Research of the Spraying and Ignition Characteristics of Coal-Water Fuels With Isopropyl Alcohol Addition

“…Одной из главных причин, сдерживающих внедрение технологий ВУТ в энергетический сектор, является образование достаточно крупных капель топлива (более 1 мм) после распыления. Времена задержки их зажигания, как правило, большие -до 30 с в неблагоприятных условиях [11,12]. Например, в России и других государствах исследованы характеристики и свойства водоугольных суспензий (ВУТ [13], органоводоугольных [14], с добавлением древесных отходов [15], спиртов [16,17]).…”

Ignition of coal‐water fuel droplets with addition of isopropyl alcohol

“…Comparative analysis 19‐27 of the ignition and combustion characteristics of CWF with a third liquid combustible component in the composition (eg, oil or alcohol) showed that the minimum ignition delay times for droplets of such three‐component suspensions are 25% to 50% less than for two‐component coal‐water fuels. Results of experimental studies 28 show that emissions of sulfur oxides are reduced by 18% to 20%, nitrogen oxides by 5% to 8% during combustion of CWF based on coal and industrial wastewater, for example.…”

“…One of the main reasons holding back the introduction of CWF technologies at thermal power stations is the long (up to 30 s in unfavorable conditions) delay times of ignition of such fuel droplets. [19][20][21] In recent decades, theoretical and experimental studies of the properties (rheological, environmental, and energy) of fuel suspensions prepared on the basis of various grades of coal with addition of waste of coal-processing and oil refineries were quite actively conducted, as well as slurries containing waste oils (machine, turbine, and transformer) 22 and alcohols. [23][24][25][26] Glushkov et al 22 present the results of a research on the properties of coal-water suspensions and their comparison with coal.…”

“…It was experimentally established 27 that emission of anthropogenic compounds is significantly lower (by 2%-5% for carbon dioxide [CO 2 ], 185-400 ppm for carbon monoxide [CO], 10-420 ppm for nitrogen oxides [NO x ], and 5-19 ppm for sulfur dioxide [SO 2 ]) during combustion of coal-water fuels with a high moisture content due to lower temperatures in the combustion zone and interaction of water vapor with oxides of sulfur, nitrogen, and carbon compared to high-temperature combustion of coal dust. 24,25 Comparative analysis [19][20][21][22][23][24][25][26][27] of the ignition and combustion characteristics of CWF with a third liquid combustible component in the composition (eg, oil or alcohol) showed that the minimum ignition delay times for droplets of such three-component suspensions are 25% to 50% less than for two-component coal-water fuels. Results of experimental studies 28 show that emissions of sulfur oxides are reduced by 18% to 20%, nitrogen oxides by 5% to 8% during combustion of CWF based on coal and industrial wastewater, for example.…”

“…Results of experimental studies 28 show that emissions of sulfur oxides are reduced by 18% to 20%, nitrogen oxides by 5% to 8% during combustion of CWF based on coal and industrial wastewater, for example. Analyzing the research results of a large group of authors, [17][18][19][20][21][22][23][24][25][26][27][28][29][30] it can be concluded that energy and environmental efficiency of multi-component coal-water fuels is higher than that of two-component fuels (proportion of plasticizer, as a rule, does not exceed 1% by weight).…”