CO2 and steam gasification of a grapefruit skin char

Márquez-Montesinos, F.; Cordero, Tomás; Rodríguez‐Mirasol, J.; Rodrı́guez, Juan J.

doi:10.1016/s0016-2361(01)00174-0

Cited by 135 publications

(77 citation statements)

References 21 publications

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“…Previous researches have shown that gasification reactivity of Fuel Processing Technology 118 (2014) 75-81 chars depends many factors, such as pyrolysis temperature and heating rate [11,12], inorganic constituents [1,13,14], and pyrolysis pressure [12,15,16].…”

Section: ) Biomass → Volatiles + Charmentioning

confidence: 99%

The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

104

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In this study, CO 2 gasification of raw and acid-washed chars obtained from various types of lignocellulosic biomasses (woody and agricultural waste biomasses) was studied under isothermal conditions (850°C) using thermal gravimetric analysis. The effect of surface area and alkali/earth alkali metals on the reactivity of the chars was investigated. The different kinetic models were used to fit with the reactivity data by using least square method. The gasification of chars with higher surface area was found to be faster than that of chars having lower surface area. The acid treatment decreased the overall gasification rate for each raw chars. However, although the AI (alkali index) values of chars obtained from agricultural biomasses had equal or higher than that of woody biomass chars, their initial rates were considerably lower. It was concluded that indigenous alkali metals of chars have a remarkable influence of gasification reactivity but an adequate surface area should be provided to react with CO 2 .

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Section: ) Biomass → Volatiles + Charmentioning

confidence: 99%

The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

104

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“…Gasification of Japanese cedar char in an entrained-flow gasifier with steam and oxygen between 900 and 1000 °C gave an value of 0.22 (Matsumoto et al 2009). Steam gasification of grapefruit char that was pyrolysed for 1 to 2 h between 900 and 1000 °C gave exponent numbers between 0.5 and 0.6 (Marquez-Montesinos et al 2002). Gasification of birch char in a steam atmosphere between 1023 and 1223 °C gave an value of 0.57, while beech wood gave 0.51 as the exponential number under the same conditions (Barrio et al 2008).…”

Section: Determination Of Reaction Kinetic Parametersmentioning

confidence: 96%

Investigation of the Reaction Behavior of Albizia gummifera Wood under Steam Gasification with Varied Partial Pressures and Gasification Temperatures

Oluoti¹,

Richards²

2016

BioResources

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The astronomical increase in global energy demand makes locating energy sources other than fossil fuels worthwhile. The use of tropical biomass wood waste as a renewable energy source was investigated in this study. The thermal conversion analysis of Albizia gummifera (ayinre) was carried out in a thermobalance reactor via steam gasification under varying temperature (700 to 1000 °C) and steam partial pressure (0.020 to 0.050 MPa). The experimental data was evaluated using three gas-solid reaction models. The modified volume reaction model (mVRM) gave the overall highest coefficient of determination (0.9993) and thereby the best conversion prediction. The observed char activation constant rates (from paired reaction conditions) indicated, on average, an increase in reactivity as the parameters increased. The results showed that the activation energy of the mVRM gave the lowest value (32.54 kJ/mol) compared with those of the shrinking core model (SCM) and the volume reaction model (VRM) (49.29 and 49.89 kJ/mol, respectively).

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“…In PSW gasification, the endothermic gasification reactions involving steam and CO 2 [32,33] (and high heating rates create a char which is more reactive and easier to deal with [34,35]. As a result of these reactions, high gasification temperatures have been reported to increase the H 2 concentration, gas yield [15] and sometimes LHV [36] for a wide range of gasification configurations and oxidizing media.…”

Section: Gasification Of Pswmentioning

confidence: 99%

Gaseous Emissions During Concurrent Combustion of Biomass and Non-Recyclable Municipal Solid Waste

2015

Solid Waste as a Renewable Resource

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The disposal of plastic solid waste (PSW) has become a major worldwide environmental problem. New sustainable processes have emerged, i.e. either advanced mechanical recycling of PSW as virgin or second grade plastic feedstock, or thermal treatments to recycle the waste as virgin monomer, as synthetic fuel gas, or as heat source (incineration with energy recovery). These processes avoid land filling, where the non-biodegradable plastics remain a lasting environmental burden. Within the thermal treatments, gasification and pyrolysis gain increased interest. Gasification has been widely studied and applied for biomass and coal, with results reported and published in literature. The application to the treatment of PSW is less documented. Gasification is commonly operated at high temperatures (> 600˚C to 800˚C) in an airlean environment (or oxygen-deficient in some applications): the air factor is generally between 20% and 40% of the amount of air needed for the combustion of the PSW. Gasification produces mostly a gas phase and a solid residue (char and ashes). The use of air introduces N 2 in the product gases, thus considerably reducing the calorific value of the syngas, because of the dilution. The paper will review the existing literature data on PSW gasification, both as the result of laboratory and pilot-scale research. Processes developed in the past will be illustrated. Recently, the use of a sequential gasification and combustion system (at very high temperatures) has been applied to various plastic-containing wastes, with atmospheric emissions shown to be invariably below the legal limits.Operating results and conditions will be reviewed in the paper, and completed with recent own lab-scale experimental results. These results demonstrate that gasification of PSW can be considered as a first order reaction, with values of the activation energy in the order of 187 to 289 kJ/mol as a function of the PSW nature.

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CO2 and steam gasification of a grapefruit skin char

Cited by 135 publications

References 21 publications

The effect of char properties on gasification reactivity

The effect of char properties on gasification reactivity

Investigation of the Reaction Behavior of Albizia gummifera Wood under Steam Gasification with Varied Partial Pressures and Gasification Temperatures

Gaseous Emissions During Concurrent Combustion of Biomass and Non-Recyclable Municipal Solid Waste

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