The Influence of Organic Waste Content on Characteristics of Inert Heating and Ignition of Composite Liquid Fuel Droplets

Ignition Characteristics of Coal–Water Slurry Containing Petrochemicals Based on Coal of Varying Degrees of Metamorphism

“…One of the promising directions for the development of composite coal fuels is the preparation of a coal–water slurry containing petrochemicals (CWSP). − Such a slurry has not only water and coal in its composition but also a flammable liquid of petroleum or natural origin (for example, oils, alcohols, resins, water–oil emulsions, fuel oil, oil sludge, etc.). Flammable liquids are added to the slurry composition to enhance the stability of fuel (segmental stability) and to change its energy characteristics.…”

“…This is a promising technology for combustion of biomass, waste, and liquid coal fuel. However, despite the relevance and expediency to use CWSP in power plants, there is a rather limited number of the experimental and theoretical data indicating how different components influence the combustion characteristics of CWSP − based on waste of processing coal and oil.…”

“…One of the ways to reduce the ignition delay of composite liquid fuel is to add such high-reaction substances as petroleum derivatives − or high-reaction coal to its composition. Note that, despite the spread and large stocks of lignite (which is the most highly reactive type of coal) in many regions of the world, it is not in high demand in industry and power generation, in contrast to bituminous coal and anthracite.…”

“…Note that, despite the spread and large stocks of lignite (which is the most highly reactive type of coal) in many regions of the world, it is not in high demand in industry and power generation, in contrast to bituminous coal and anthracite. Usually, lignite is not a project (main) fuel in thermal power plants and other power units because of its high humidity and ash content, as well as a large amount of volatiles in its structure. , The latter is a main cause for high risk of fire and explosion of lignite during its transportation, loading, drying, and preparation. , However, lignite can be effectively used for preparing CWS and CWSP to enhance the reactivity of the fuel composition, especially under low-temperature conditions (the oxidant temperature is less than 1000 K). − Note that, to date, there is a lack of data on the combustion characteristics and conditions of CWS and CWSP consisting of coal of varying degrees of metamorphism (for example, refs and ). In particular, ref put forward the idea that to prepare CWS from the mixture of low-reaction coal (anthracite) and high-reaction lignite is reasonable.…”

“…Moreover, the study specifies the ignition temperature, the duration of evaporation and burning of an individual CWS droplet. Reference reports that an increasing concentration of enriched coal in CWSP based on waste coal leads to decreasing the time of combustion initiation by 10–15%. Thus, the creation of a fuel composition is of interest when combining components ensuring not only a high calorific value (owing to high-calorie bituminous coal or anthracite) but also relatively high reactivity (by adding a combustible liquid and lignite).…”