pyrolysis and gasification differentiation pdf

Pyrolysis and gasification differentiation pdf

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Thermodynamic and Kinetic Study of Lignocellulosic Waste Gasification

To better realize how CaO promoted the pyrolysis process of a corn stover, which was important for further development of its technology, various effects of calcium oxide CaO on the pyrolysis of the corn stover at different temperatures were studied. Moreover, CaO was found to absorb some CO 2 and H 2 O produced during the pyrolysis, as well as promote the occurrence of pyrolysis, and reduce the activation energy required for the reaction. According to the calculation of the activation energy, the optimal addition ratio of CaO and the corn stover should be between and The analysis of the release of pyrolysis gas showed that CaO had a beneficial effect on deacidification and the production of hydrocarbons and aromatic compound gas.

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The effects of feedstock type and biomass conversion conditions on the speciation of sulfur in biochars are not well-known. In this study, the sulfur content and speciation in biochars generated from pyrolysis and gasification of oak and corn stover were determined. We found the primary determinant of the total sulfur content of biomass to be the feedstock from which the biochar is generated, with oak and corn stover biochars containing and — ppm sulfur, respectively. In contrast, for sulfur speciation, we found the primary determinant to be the temperature combined with the thermochemical conversion method. EDS mapping of a biochar produced from corn stover pyrolysis shows individual sulfur-containing mineral particles in addition to the sulfur that is distributed throughout the organic matrix. Lignocellulosic biomass is a renewable carbon source. The trace elements in biomass, such as potassium, sulfur, phosphorus, and chlorine, are also partitioned between gas and solid biochar and ash phases.

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The weight loss and their derivative curves show that the gasification takes place in three visible stages. The kinetic study was carried out using Coats-Redfern methods. The Ginstling-Brounstein model showed better fit. On the other hand, a thermodynamic model was proposed to predict the five waste gasification processes, considering the char and tar production. The higher temperatures favor the endothermic reactions as the H2 and CO formation reactions. Therefore, in the product, moles of H2 and CO increase and consequently the exergy efficiency of the process. Increasing the equivalence ratio value, H2, CO, and CH4 contents decrease; thus the calorific value of the produced gas and the exergetic efficiency decrease.


measure CO, CO2, CH4, CnHm, O2, H2, heating value.


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The aim of this study was to evaluate the effect of the moisture content in the mass and energy balance of Eucalyptus wood during the pyrolysis process in a macro-lab scale. Two cylindrical specimens of 30 cm length, 12 cm diameter, and two pre-established moisture contents of 0. The experiment was carried out in an electric oven, heating rate of 5 o C. Mass and energetic potentials of the non-condensable gases flow, were estimated from the data provided by the software Macro Thermogravimetric.

Thermodynamic and Kinetic Study of Lignocellulosic Waste Gasification

Gasification is a technological process that can convert any carbonaceous carbon-based raw material such as coal into fuel gas, also known as synthesis gas syngas for short. Composed primarily of the colorless, odorless, highly flammable gases carbon monoxide CO and hydrogen H 2 , syngas has a variety of uses. The advantages of gasification in specific applications and conditions, particularly in clean generation of electricity from coal, may make it an increasingly important part of the world's energy and industrial markets.

FTIR spectroscopy was used to obtain the IR spectra of generated gases and study their variation at different temperatures in the process of coal heating without oxygen, and the gas release during pyrolysis was discussed. The values of maximum and minimum weight loss rates were The mass loss during the pyrolysis process corresponded well with the volatile matter contained in the sample.

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3 comments

  • Roeterbcribin 16.05.2021 at 13:56

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  • Apolline T. 16.05.2021 at 17:38

    The decrease in fuel inorganic content with increasing PO fraction resulted in more dilute green liquor GL , and a greater portion of the feedstock carbon ended up in syngas as CO.

    Reply
  • Thibaut F. 25.05.2021 at 13:29

    The use of thermogravimetric analysis to describe biomass kinetics often uses bench top thermogravimetric analyser TGA analysers which are only capable of low heating rates.

    Reply

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