Conditions and characteristics of droplets breakup for industrial waste-derived fuel suspensions ignited in high-temperature air

Glushkov, Dmitrii O.; Feoktistov, Dmitriy; Кузнецов, Г. В.; Batishcheva, Kseniya; Kůdelová, Tereza; Paushkina, Kristina

doi:10.1016/j.fuel.2019.116915

Cited by 39 publications

(4 citation statements)

References 77 publications

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“…Dependences of the ignition delay time of the studied hydrocarbon droplets on the heating medium temperature in range from 450 to 700 °C are presented in Figure 4. For all samples the ignition delay time τi was found to exponentially decrease with the increasing of heating medium temperature which was in good correspondence with earlier published articles [29][30][31]. The average ignition delay time of the studied samples was reduced by 19.2 times with increase in the temperature from 450 °C to 700 °C.…”

Section: Droplet Ignition and Combustion Of Liquid Hydrocarbonssupporting

confidence: 90%

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Liquid Hydrocarbons Production by the Steam Gasification of Used Tires: Energy Characteristics and Environmental Sustainability

Ларионов¹,

Slyusarskiy²,

Kirgina³

et al. 2021

Preprint

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The technical characteristics of liquid hydrocarbons obtained by steam gasification of the recycled automobile tires were studied as well as the features of their combustion process. Steam gasification of grinded tires was carried out in a tubular reactor using superheated steam with 500°C temperature and 5 kg/h mass flow rate. The obtained characteristics were compared with a traditional liquid fuel oil. The technical characteristics were determined via the standard analytical methods. An ignition and a combustion of liquid hydrocarbon samples were carried out in the combustion chamber at different temperatures of heating medium Tg = 450–700°C. Gas-phase combustion products were analyzed using a flow-through gas analyzer. It was found that liquid hydrocarbons were characterized by a low pour point (-43°C – (-52) °C) and comparable to calorific value of traditional fuel oil (40.56–43.3 MJ/kg). In addition, the studied samples of liquid hydrocarbons were characterized by a lower ignition delay time (by 56 %, on average) and flame burning time (by 30 %, on average). Combustion process of the studied samples (including traditional fuel oil) was accompanied by the formation of micro-explosions.

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Section: Droplet Ignition and Combustion Of Liquid Hydrocarbonssupporting

confidence: 90%

“…They open channels for the release of light volatile compounds during vaporization and initiate the microburst effect. Intensity of microbursts was increased with the temperature of the heating medium, which was also reported in some other articles [29][30][31].…”

Section: Introductionsupporting

confidence: 83%

Liquid Hydrocarbons Production by the Steam Gasification of Used Tires: Energy Characteristics and Environmental Sustainability

Ларионов¹,

Slyusarskiy²,

Kirgina³

et al. 2021

Preprint

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show abstract

“…There are two types of fragmentation. Primary fragmentation is destruction of particles at stages of fuel drying and devolatilization [50][51][52]. It is due to mechanical stresses between different points of the same particle with different temperatures, and due to the destructive effect of the pressure of gas-vapor formed during pyrolysis.…”

Section: Particles Fragmentation During Combustionmentioning

confidence: 99%

Experimental Study to Replicate Wood Fuel Conversion in a Downdraft Gasifier: Features and Mechanism of Single Particle Combustion in an Inert Channel

Svishchev

2022

Applied Sciences

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Downdraft gasification is a promising process of energy conversion of wood biomass. There are such fuel conversion conditions that differ favorably from conventional conditions. In such conditions, there is no pyrolysis zone in the fuel bed, which precedes the oxidation zone. Fuel is supplied into the oxidizing zone without charring, where it reacts with the intensive cold air flow from tuyeres. The study aims to replicate the conversion of particles in a gasifier close to tuyeres. For this purpose, the individual particles are burned in the muffle furnace space and the quartz channel replicating presence of other bed particles at a first approximation. In the experiment, the furnace temperature was varied, as well as the velocity of air supplied to the particle. Two-stage and single-stage mechanisms of particle combustion were identified. A two-stage process is observed in the range of tuyere velocities below 20 m s−1. The two-stage mechanism is characterized by a stage of devolatilization and volatiles combustion, followed by a stage of char residue combustion. The stages are predominantly separate from each other, and their degree of overlapping is low, amounting to 24%. At the tuyere velocities above 125 m s−1 combustion of particles is realized primarily as a single-stage process. The intensive air flow reaches the fuel particle surface and initiates combustion of the surface char layer. In this case, the stages of devolatilization and char residue combustion run concurrently for the most part. In the single-stage mechanism, the degree of stage overlapping is significantly higher and amounts to 60–95%. For the two-stage combustion mechanism, the effect of cyclic movement of the flame across the particle surface is evident. The number of cycles can reach eight. This effect is due to the change of conversion stages. At air velocity above 95 m s−1, fragmentation of fuel particles commences. A layer of char formed at an initial stage of burning heats up in the intensive air flow and is separated from the particle surface. The heated walls of the quartz channel contribute to the intensification of particle combustion. This effect is probably due to the swirling of the flame between the wall and the particle surface.

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“…Currently, CWF is considered as an alternative replacement for the traditional liquid‐hydrocarbon slurry (fuel oil and oil) and is actively studied by various scientific schools 19‐23 . The advantage of this type of slurry is in the variation of different fuel components (waste oils, solid household, and industrial waste, as well as waste from coal mining and oil refining enterprises), which can have a positive impact on environmental and energy characteristics 24‐26 . In Reference 24, the authors found that these slurry composites are more prospective than the traditional coal in terms of a whole set of criteria: heat value, ignition temperature, and its combustion kinetics, as well as anthropogenic emissions and costs.…”

Section: Introductionmentioning

confidence: 99%

Energy recycling of pyrolysis water as a part of coal‐water fuel

Ларионов

Gvozdyakov

Zenkov

et al. 2021

Intl J of Energy Research

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Under research, there is a combustion process of multicomponent coal-water fuel (CWF) that was conducted with mixing ratio of coal, pyrolysis, and technical water. The pyrolysis water was extracted through pyrolysis oil settling, where the oil was obtained from pyrolysis of wood waste. Ignition and combustion of CWF samples were carried out in a combustion chamber at heating medium temperatures (T g = 600-1000 C, with an interim step of 50 C). Gas-phase combustion products were analyzed with a flow-line gas analyzer. Technical water in CWF composition was replaced with pyrolysis one that was acted to raise the reactive capacity. It resulted in reducing the ignition delay time τ i (by an average of 25%) and the minimum ignition temperature T min i (from 440 С to 393 С, reliance on a CWF composition). In addition, increase in flame combustion time was recorded by an average of 20%, as well as dependence on a heating medium temperature and a CWF composition. In the case when a CWF liquid-phase component was completely replaced with the pyrolysis water, the significant increase in heat value by 2.14 MJ/kg was observed. According to the data of the flow-line gas analyzer, we concluded that the CWF combustion based on the pyrolysis water was accompanied by less NO x emission (by an average of 22%) but more CO and CO 2 amount (by an average of 1.4 and 1.2, respectively). It was found according to the results of the energy balance assessment that application of pyrolysis water in CWF composition leads to a decrease in fuel consumption for heat production by 16.7%.

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Conditions and characteristics of droplets breakup for industrial waste-derived fuel suspensions ignited in high-temperature air

Cited by 39 publications

References 77 publications

Liquid Hydrocarbons Production by the Steam Gasification of Used Tires: Energy Characteristics and Environmental Sustainability

Liquid Hydrocarbons Production by the Steam Gasification of Used Tires: Energy Characteristics and Environmental Sustainability

Experimental Study to Replicate Wood Fuel Conversion in a Downdraft Gasifier: Features and Mechanism of Single Particle Combustion in an Inert Channel

Energy recycling of pyrolysis water as a part of coal‐water fuel

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