Results of Study of Sulfur Oxide Reduction During Combustion of Coal-Water Slurry Fuel Through use of Sulfur Capturing Agents

Abstract

Abstract. It is shown that an effective way of burning high sulfur coal is to burn coal-water slurry fuel (CWF) prepared on its basis containing a sulfur capture agent (SCA) entered in the slurry at the stage of preparation. The technique of thermodynamic analysis of chemical reactions during CWF burning has been developed including burning in the presence of SCA. Using the developed calculation program, the optimal temperature conditions have been determined as required for the effective reduction of sulfur oxides in flue gases when using different types of SCA. According to the results of calculating the composition of CWF combustion products when entering various substances in the burner space as SCA it has been determined that magnesite, calcite, and dolomite are the most effective natural minerals. The analysis of calculated and experimental data proves the efficiency of SCA addition as well as validity of the obtained results.

Studies on CWL with glycerol for combustion process

“…This reduces the emission of sulfur dioxide. According to Murko et al, it is possible to increase the efficiency of reduction of sulfur oxides in the flue gases during the combustion of coal-water suspensions by adding sulfur capture agents, whose action regards bonding of either sulfuric substances or compounds containing sulfur and formation new sulfuric compounds in the solid phase (Murko et al 2016 ).…”

Development of Efficient Technologies for Abatement of Nitrogen and Sulfur Oxides in Flues Gases of Coal Combustion

“…Figure 1 presents the site for preparation of coal fuel (including water-coal slurry fuel) and SAR in the composition of the test bench created in the frame of the project. As the main technology of the fuel preparation for the combustion, the technology of water-coal slurry fuel (WCF) was used [1][2][3]. The water-coal slurry fuel containing SAR was prepared from the mixture of the filtercake of "Barzas Association", technical water and a plasticizing additive.…”

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.…”

“…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).…”

“…Results of the studies 25 show that low heating rates of the fuel with oil and ethanol in the composition (up to 20% by weight) contribute to the evaporation of moisture before the start of the combustion process, thereby not affecting the general ignition characteristics of such fuel. 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.…”