Abstract
The article presents the results of experimental studies performed for the comparative analysis of factors affecting the concentration of the main gas emissions during the combustion of fuel suspensions obtained from coal enrichment waste. The factors influencing the formation of anthropogenic emissions during the flaring of coal-water fuel suspensions were investigated. Experiments were carried out with coal processing waste, both with and without additives in the form of spent mineral oil. The article shows how the concentration of sulfur dioxide, nitrogen dioxide, and hydrocarbons is affected by the parameters of preparation (particle size, solid-liquid phase ratio, additives of used engine oil) and flame combustion (temperature in the combustion chamber, excess air coefficient, and droplet size after spraying) of fuel suspensions. The ranges of parameters were selected at which the best combustion parameters are observed, based on the data obtained: degree of grinding is less than 100μm, solid part content in the suspension is from 55 to 60%; combustion temperature is in the range from 950 to 1050° C, droplet size when spraying the suspension is less than 300μm, additive of waste mineral oil is from 3 to 7 wt.%. and air-fuel ratio from 1.2 to 1.3.
Highlights
The demand for high-calorie coals is growing every year
The article presents the results of experimental studies performed for the comparative analysis of factors affecting the concentration of the main gas emissions during the combustion of fuel suspensions obtained from coal enrichment waste
Experiments to determine the effect of the fineness of grinding on the composition of waste gases were carried out for water-coal suspensions obtained from coal enrichment waste with an average particle diameter of 35, 47, 92, 154, and 202 μm
Summary
The demand for high-calorie coals is growing every year. This leads to an increase in the productivity of existing processing plants, the commissioning of new coal processing facilities and, as a result, an increase in the volume of waste generation. To be able to control the combustion process and obtain the best fuel and environmental characteristics in the thermal disposal of coal enrichment waste, it is necessary to consider the influence of the main parameters of preparation, spraying, and combustion of fuel suspensions. The concentration of hydrocarbons was determined only in those experiments where, according to the literature, a change in the parameter significantly affects the content of organic compounds in the composition of waste gases during fuel combustion. These include the effect of organic compound additives, change of the temperature in the combustion chamber, and the effect of the air-fuel ratio. When identifying the dependences of the energy and environmental characteristics of thermal utilization, the values of only one of the studied characteristics were changed separately, while the rest were unchanged
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