Influence of water-methanol solution additives on hydrocarbon fuel combustion in burner

Mathematical model of burning disposal a water-methanol solution by the gas fuel is presented. Two-dimensional model in the ANSYS Fluent Software is made. Thermal distribution of the flare and distribution of methane concentration are derived. We analysed the results of mathematical modelling

Influence of water-methanol solution additives on hydrocarbon fuel combustion in burner

Mathematical model of burning disposal a water-methanol solution by the gas fuel is presented. Two-dimensional model in the ANSYS Fluent Software is made. Thermal distribution of the flare and distribution of methane concentration are derived. We analysed the results of mathematical modelling

Influence of gellant and drag-reducing agent on the ignition characteristics of typical liquid hydrocarbon fuels

This experimental research studies the ignition of fuel particles (droplets) in a high-temperature air medium. Two groups of fuel compositions are considered: the first one is based on kerosene, the second one is based on diesel fuel, with gellant (silicon dioxide) and drag-reducing agent (polyhexene) added to them, respectively. The following compositions were used: K-100 (100% kerosene), K-99 (1 wt% silicon dioxide), K-95 (5 wt% silicon dioxide), K-90 (10 wt% silicon dioxide), K-85 (15 wt% silicon dioxide), D-100 (100% diesel fuel), D-FTA (0.04 wt% ForeFTA drag-reducing agent according to TU 2458-002-10022,712-2015), and D-FTA02 (0.04 wt% ForeFTA-02 drag-reducing agent according to TU 20.59.42-015-10022,712-2018). Fuels K-100, D-100, D-FTA, and D-FTA02 behave like Newtonian fluids with constant viscosity vs. shear rate. Kerosene gels K-99 and K-95 behave like non-Newtonian fluids, exhibiting a shear-thinning property, and decrease in viscosity with an increase in the shear rate. Kerosene gels K-90 and K-85 are incapable of flowing and appear to be “solids”. Single fuel particles (droplets) were ignited in a heated air medium at temperatures 873–1273 K. Using a system of high-speed video recording, we established that at various initial temperatures of the compositions, different in the concentrations and appearance of fuel components, an identical set of physical and chemical processes occurs during the induction period, whose duration corresponds to the ignition delay time. These are roughly the same as the processes, occurring when liquid fuels are ignited in a normal state (without gellants or agents). The lowest temperature of heated air, at which fuel compositions are ignited, is 873 K. This value can be notionally referred to as the auto-ignition temperature of fuel when conducting the experiments under the said conditions. The ignition delay times for K-100 and K-99 droplets are identical, whereas for K-95, K-90, and K-85, they are 10–30% longer than the induction period for liquid fuel droplets in a normal state. Compositions based on diesel fuel with 0.04% of drag-reducing agent feature puffing of droplets, when heated, though this process does not affect ignition delay times as the main process characteristic

Conditions and Characteristics of Coal Water Slurry Containing Petrochemicals Ignition by Hot Particle

Characteristics of CWS containing petrochemicals ignition by single hot particle in disk shape established experimentally. The main components of fuel composition are coal 45 %, water 45 %, used engine oil 10 %. The main parameters of local heat sources are: material – steel, diameter 10–12 mm, high 4–8 mm. As a result of experimental study is established limit (minimum) conditions for ignition of CWS containing petrochemicals by hot particle and the impact of local heat source parameters on the main process characteristic – ignition delay time

Ignition mechanism and characteristics of gel fuels based on oil-free and oil-filled cryogels with fine coal particles

Methods of preparing heterogeneous gel fuels have been elaborated on the basis of oil-free and oil-filled cryogels, containing coal dust particles with a size no more than 140 μm. Mechanical properties of 20-mm fuel pellets have been analyzed. The ignition mechanisms of heterogeneous gel fuels have been experimentally discovered in a high-temperature (600–1000 °C) oxidizer medium, and the influence of the initial fuel temperature (from −85 to 20 °C) on the fuel ignition characteristics has been researched. The multi-component composition of the oil-filled cryogels with coal dust particles is the reason for microexplosions that leads to the fuel sample dispersion and intensification both the ignition and burnout. Such fuel compositions are characterized by 1.5–2-fold lower ignition delay times (1–6 s vs. 2–12 s) than the compositions based on cryogels containing only coal particles, other things being equal

Oil-filled cryogels: new approach for storage and utilization of liquid combustible wastes

A method of preparing oil-filled cryogels on the basis of an aqueous solution of poly(vinyl alcohol) (PVA) has been elaborated. The stability of primary oil emulsions and their rheological properties were analyzed for 30 days, as well as the mechanical properties of gel fuel pellets (obtained after 15 cycles of freezing/thawing of oil emulsions) with size of 20 mm for a group of compositions: 100-20 vol % aqueous solution of PVA (5, 10 wt %) + 0-80 vol % oil. The rheological behavior of non-Newtonian oil emulsions is described by the Herschel-Bulkley model. The elastic moduli and the tensile strength of fuel pellets of different component compositions range from 0.7 to 7.6 kPa and from 2.5 to 60 kPa, respectively. The oleophilic properties are more distinct for gel fuel prepared from oil emulsions with a higher content of the dispersed phase and lower concentrations of the polymer in the dispersion medium. The ignition mechanism and combustion characteristics have been established for processes occurring under the conditions of a radiant heat supply. Gel fuels, unlike combustible liquids, are characterized by a longer induction period, but a multicomponent structure of fuel caused microexplosions that enhance the combustion process