On the influence of different experimental systems on measured heterogeneous gasification kinetics

Stoesser, P.; Schneider, Christoph; Kreitzberg, Thobias; Kneer, Reinhold; Kolb, Thomas

doi:10.1016/j.apenergy.2017.11.037

Cited by 30 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the char was produced under typical conditions of entrained-flow gasification (EFG). The char (WC1600) [44] was sieved to a 50-100 µm fraction. Physical and chemical data of the biomass char can be found in Table 1.…”

Section: Biomass Char Characterizationmentioning

confidence: 99%

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

Schneider

Prat

Kolb

2020

Fuel

View full text Add to dashboard Cite

Section: Biomass Char Characterizationmentioning

confidence: 99%

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

Schneider

Prat

Kolb

2020

Fuel

View full text Add to dashboard Cite

“…Char gasification kinetics have been researched extensively using various types of experimental equipment. According to a summary by Stoesser et al, approximately 60% of experiments have been carried out in TGA systems, − followed by fixed bed reactors, drop-tube furnaces, , and fluidized bed reactors. ,, Various influencing parameters were investigated with regard to the char gasification process, such as the coal rank, pressure, gas temperature, gas composition, particle size, etc. These parameters were varied throughout a wide range as a result of the demands of different applications.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Gasification of a Lignite Char in Microfluidized Bed Thermogravimetric Analysis for Chemical Looping Combustion and Chemical Looping with Oxygen Uncoupling

Wang

et al. 2018

Energy Fuels

View full text Add to dashboard Cite

Chemical looping combustion (CLC) and chemical looping with oxygen uncoupling (CLOU) are novel combustion technologies with low energy penalty CO2 capture. In a CLC/CLOU unit, the gasification of char is the rate-controlling step as a result of the slow gasification kinetics of char under a CO2 and H2O atmosphere. Reliable measurements of char gasification kinetics are absolutely necessary for CLC/CLOU reactor design, operation, and optimization and are the focus of this paper. To solve the problems of measuring gasification kinetics using thermogravimetric analysis (TGA) and fluidized bed (FB) reactors with gas measuring, a microfluidized bed thermogravimetric analysis (MFB–TGA) method was developed and reported in this paper to investigate the CO2 gasification of a lignite char. The feasibility of the novel MFB–TGA approach was tested, and its stability and accuracy were validated. MFB–TGA was then used to study the CO2 gasification of a lignite char. First, the CO2 gasification kinetics of the lignite char in MFB–TGA were compared to those obtained using a TGA-Q500 instrument. The char gasification kinetics in MFB–TGA were found to be much faster than those in the TGA-Q500. Second, the effect of the particle size on the gasification kinetics was investigated, and it was found that 900–1250 μm was the threshold size range, below which there was no obvious particle size effect on the kinetics. However, for particle sizes larger than 900–1250 μm, the effect of the particle size on the kinetics was significant. Then, using 900–1250 μm particles, the influence of the temperature, CO2 concentration, and O2 concentration was studied, and the experimental results obtained from MFB–TGA showed that the lignite char could be fully converted within 300 s at 900 °C with 75 vol % CO2. The time for the full conversion of the char could be reduced to 190 s when the gasification temperature was increased to 950 °C or when 3 vol % O2 was present in the atmosphere. Finally, a predictive kinetic model was developed from the experimental results, which could predict both the conversion of carbon versus time and the reaction rate versus carbon conversion well.

show abstract

“…Reaction kinetics is important for elucidating the thermochemical reaction's mechanism, design, and optimization process conditions. 20,21 Many kinetic models of coke gasification reaction, including the homogeneous model (HM), shrinking unreacted core model (SUCM), distributed activation energy model (DEAM), and random pore model (RPM), have been established to simulate the gasification reaction process, and their applicability has been discussed. Wu et al 22 simulated the gasification reaction process between Yanzhou coal char and steam, and found that the correlation between the fitted and actual data of SUCM outperformed that of the HM.…”

Section: Introductionmentioning

confidence: 99%

Promoting characteristics and mechanisms of phenol in coking wastewater on coke gasification

Geng

Bai

Zhong

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary Coke gasification and coking wastewater treatment are the major concerns of the research community, both in the past and today. However, most researchers have not paid enough attention to the research that phenol in coking wastewater can promote coke gasification. The promoting characteristics of aqueous solution with phenol concentration of 1000 and 2000 mg/L on coke gasification were experimentally studied. The effects of the reaction temperature on coke gasification, phenol concentration in water on reaction kinetics, and phenol aqueous solutions on the coke structure during gasification reactions were explored. The morphological, physicochemical, and textural properties of coke were characterized using Raman spectroscopy, scanning electron microscopy, and N2 low‐temperature physical adsorption analyzer. Results show that with an increase in the reaction temperature from 900°C to 1100°C, the total syngas amount, low calorific value, carbon conversion, and reaction rate increased by 20.5%, 4.6%, 10.2%, and 1.2 times, respectively. The random pore model was the most suitable among the considered kinetic models. The apparent activation energy for the reaction of aqueous solution with phenol concentration of 1000 and 2000 mg/L reacted with gasification‐coke was approximately 8.48% and 27.26% lower than that of pure water with coke, respectively. Compared with pure water, phenol aqueous solutions may preferentially consume the amorphous carbon structure and penetrate deeply into the carbon matrix of the gasification‐coke to participate in the reaction. Phenol aqueous solutions can inhibit the sintering and aggregation of the ash phase in coke and improve its dispersibility on the coke surface. Moreover, it facilitates the development of the coke pore structure.

show abstract

On the influence of different experimental systems on measured heterogeneous gasification kinetics

Cited by 30 publications

References 29 publications

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

CO₂ Gasification of a Lignite Char in Microfluidized Bed Thermogravimetric Analysis for Chemical Looping Combustion and Chemical Looping with Oxygen Uncoupling

Promoting characteristics and mechanisms of phenol in coking wastewater on coke gasification

Contact Info

Product

Resources

About

On the influence of different experimental systems on measured heterogeneous gasification kinetics

Cited by 30 publications

References 29 publications

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

CO2 Gasification of a Lignite Char in Microfluidized Bed Thermogravimetric Analysis for Chemical Looping Combustion and Chemical Looping with Oxygen Uncoupling

Promoting characteristics and mechanisms of phenol in coking wastewater on coke gasification

Contact Info

Product

Resources

About

CO₂ Gasification of a Lignite Char in Microfluidized Bed Thermogravimetric Analysis for Chemical Looping Combustion and Chemical Looping with Oxygen Uncoupling