AFBC of coal with tyre rubber. Influence of the co-combustion variables on the mineral matter of solid by-products and on Zn lixiviation

Díaz-Bautista, Arantxa; Álvarez-Rodríguez, Ramón; Clemente-Jul, Carmen; Mastral, A.M.

doi:10.1016/j.fuel.2012.12.041

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…Although no prediction model has acquired universal application, almost all coking plants have some form of a model based on coal rank, rheological properties, petrology and ash chemistry. Due to its influence on the CRI and CSR indices, the role of the ash composition has been given more consideration because certain minerals in coke have an accelerating or inhibiting effect on coke gasification as a result of catalytic reactions [7]. Alkalis are also responsible for the deterioration of coke quality, since they attack and degrade the carbon fraction of coke in a blast furnace [35].…”

Section: Carbonization and Coke Qualitymentioning

confidence: 99%

“…Waste tyres can be co-injected with metallurgical coke in the electric arc furnace steelmaking process to provide additional energy for combustion [6]. Previous works study the combustion of different rank coals mixed with end-of-life tyres in an atmospheric fluidized bed combustion (AFBC) pilot plant [7]. This combustion system shows several advantages over conventional systems, such as fuel flexibility and better emissions control.…”

Section: Introductionmentioning

confidence: 99%

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Recycling tyre wastes as additives in industrial coal blends for cokemaking

Fernández

Barriocanal

Díaz-Faes

2015

Fuel Processing Technology

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Two industrial coal blends (B1 and B2) used in cokemaking were selected for this study. Two wastes from scrap tyres (TC, F) were added to these coal blends at different ratios (98:2 and 95:5). The investigation was focused on assessing the influence of the additives on thermoplastic properties of coal by means of the Gieseler fluidity test and thermogravimetric. In addition, the blends were carbonized in a 17 kg electrically heated movable wall oven in order to examine the quality of the resultant cokes. Quality of the cokes produced was evaluated by measuring their cold mechanical strength, reactivity and post-reaction strength. It was found that ash composition of the additives contribute to a deterioration in coke quality. Moreover, F causes a greater decrease in coke strength after reaction with CO 2 due to the diminution of bulk density in the coking process and to the higher basicity index. Trace elements were also studied in relation to waste addition.

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Section: Carbonization and Coke Qualitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recycling tyre wastes as additives in industrial coal blends for cokemaking

Fernández

Barriocanal

Díaz-Faes

2015

Fuel Processing Technology

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“…Fluidized bed incinerators are characterised by high flexibility, i. e. the possibility of burning fuels in all physical states [1][2][3][4][5][6][7], homogeneous thermal conditions and proper mixing of the fuel-oxidant system. They are used to burn fuels such as coal [8][9][10], biomass [11,12] and to dispose of solid waste. Electronic waste [13,14] polymers [15,16], low calorific and water-containing waste such as wet sewage sludge [17], and rubber waste [18,19], can be mentioned from the full range of waste types.…”

Section: Introductionmentioning

confidence: 99%

Cenospheric and sand fluidized bed as an environment for waste rubber combustion-comparisons of decomposition dynamics and flue gas emission

et al. 2019

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The results of thermal recycling of rubber in the fluidized bed are presented. Two different types of the bed material were used: sand and low density spheres (cenospheres). For two bed types, rubber decomposition time, as the mass and the bed temperature functions, were determined. Time of the samples residence time was calculated with the assumption, that reactor and the analytical block may be described with the well-stirred model. Time of samples decomposition, decrease with increasing temperature, as expected. It was also established, there are significant deviations between shirking core model, and obtained results of the residence time as a mass function. Cenospheric bed application allows to reduce of the process pressure drop, and caused shift of the gas decomposition products zone to the deeper region of the bed. Acoustic and optical effects confirmed significant differences between combustion of sand and cenospheric bed. Higher frequency of bubbles explosions and reduction of diffusive flames number were observed during incineration in cenospheric bed. The relationship between exhaust emission (VOC, CO, NO x) and type of the bed was not confirmed, the identical situation is observed for the samples combustion time. In the presented manuscript, the above physical quantity depends almost completely on sample type and bed temperature.

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“…In the case of liquid [2, 3] or solid fuels [4–8], the processes is always accompanied by the combustion of the gaseous products of their evaporation or/and decomposition [2–8]. A fluidized bed reactor can be fed, also in a specific bubbling fluidized bed combustor employing the jet-fountain configuration [9, 10].…”

Section: Introductionmentioning

confidence: 99%

Premixed LPG + Air Combustion in a Bubbling FBC with Variable Content of Solid Particles in the Bubbles

Baron

Żukowski

Migas

2018

Flow Turbulence Combust

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This paper presents the results of studies on the combustion of gaseous LPG in a bubbling fluidized bed. Relationships between the temperature, the bed mass and the location of the combustion zone and the NOx and CO concentrations in exhaust gases are described. The concentrations of both gases increase with rising temperature and then quickly decline. It has been shown that despite the increase in average bed temperature the drop in the emission of nitrogen oxides is connected with lower temperatures inside the exploding bubbles. These temperatures strongly depend on the quantity of solid contained in them. The paper also presents the results of modeling the combustion process in a fuel-air bubble. The modeling carried out has shown that above the temperature at which bubble self-ignition becomes possible inside the bed, with further bed temperature rise there is an increase in the solids content inside the bubbles at the moment of explosion. As a result, the maximum temperature inside the bubbles falls and the emission of nitrogen oxides is reduced. In turn, the emission of CO is linked to the propagation of combustion between bubbles when self-ignition cannot take place inside them. Graphical AbstractComparison of experimental and calculated NOx concentration, as a function of the fluidised bed temperature Highlights1.A gaseous fuel burns in a bubbling fluidized bed2.The combustion is intermittent and takes place inside bubbles, the combustion process starts in the toroidal part of the bubble3.The NO concentration is linked to the bubble temperature, not to the bed temperature4.The solids inside a bubble affect its thermal capacity5.Consequently NO concentration falls with rising bed temperature

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AFBC of coal with tyre rubber. Influence of the co-combustion variables on the mineral matter of solid by-products and on Zn lixiviation

Cited by 10 publications

References 23 publications

Recycling tyre wastes as additives in industrial coal blends for cokemaking

Recycling tyre wastes as additives in industrial coal blends for cokemaking

Cenospheric and sand fluidized bed as an environment for waste rubber combustion-comparisons of decomposition dynamics and flue gas emission

Premixed LPG + Air Combustion in a Bubbling FBC with Variable Content of Solid Particles in the Bubbles

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