scholarly journals Development of method for determination of the kinetics constants of coal char gasification in pore diffusion regimes

2019 ◽  
Vol 114 ◽  
pp. 07007
Author(s):  
Irina Remkunas ◽  
Igor Donskoy ◽  
Aleksandr Kozlov
Keyword(s):  
Heterogeneous Reactions ◽  
Kinetic Constants ◽  
Carbon Conversion ◽  
Porous Sample ◽  
Char Gasification ◽  
Gasification Process ◽  
Diffusion Controlled ◽  
Reliable Assessment ◽  
Coal Char Gasification

In this paper, we developed a method for determining the kinetic constants of partially diffusion-controlled heterogeneous reactions in a porous sample of powder. Studies have been conducted on the experimental data of thermogravimetric analysis of carbon conversion in a stream of CO2, using a new method of processing kinetic curves, to obtain updated values of the kinetic constants under conditions where widely used models are inappropriate. Data obtained can be used for a reliable assessment of the characteristics of the gasification process.

scholarly journals Determination of the kinetic constants of the process of plasma gasification of coal-water fuel

2019 ◽  
Vol 109 ◽  
pp. 00034
Author(s):  
Leonid Kholiavchenko ◽  
Yevhen Pihida ◽  
Serhii Demchenko ◽  
Serhii Davydov
Keyword(s):  
Kinetic Constants ◽  
Carbon Conversion ◽  
Thermal Transformations ◽  
Plasma Gasification ◽  
Gaseous Environment ◽  
Gasification Process ◽  
High Temperature Processing ◽  
Fuel Particles ◽  
Kinetics Of

The chemical kinetics of processes of thermal transformations of carbon-containing media was studied at high-temperature processing (2000 K ≤ T ≤ 5000 K) in the chamber of a plasma-jet reactor using water vapor as an oxidizer. The chemical reactions rate was calculated according to the method of determining the kinetic constants of the process of gasification of coal-water fuel. The influence of the temperature of the gaseous environment in the chamber on the time of complete carbon conversion of the fuel particles is established. An example of calculating the parameters of the gasification process of coke residue particles with a size of (5 - 20)·10-5 m with an oxidizer excess coefficient α = 0.45 and fuel consumption mf = 100 kg/hr is given. The expediency of the process of vapor-plasma gasification at the temperature of gases in the reactor chamber up to 3000 K is shown.

scholarly journals Kinetics of Pyrolysis and Gasification Using Thermogravimetric and Thermovolumetric Analyses

2016 ◽  
Vol 62 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Grzegorz Czerski ◽  
Katarzyna Zubek ◽  
Przemysław Grzywacz
Keyword(s):  
Conversion Degree ◽  
Solid Fuels ◽  
Carbon Conversion ◽  
Continuous Analysis ◽  
Gasification Process ◽  
Miscanthus Giganteus ◽  
Loss Of Weight ◽  
Kinetics Of ◽  
Carbon Dioxide Gasification

Abstract The carbon dioxide gasification process of Miscanthus giganteus biomass was examined using two methods. First an isothermal thermovolumetric method was applied. The measurement was conducted at 950°C and pressure of 0.1 MPa. Based on the continuous analysis of different kinds of gases formed during the gasification process, the thermovolumetric method allowed the determination of yields and composition of the resulting gas as well as the rate constant of CO formation. Then a non-isothermal thermogravimetric method was applied, during which the loss of weight of a sample as a function of temperature was recorded. In the course of the measurement, the temperature was raised from ambient to 950°C and the pressure was 0.1 MPa. As a result, a change in the carbon conversion degree was obtained. Moreover, TGA methods allow distinguishing various stages of the gasification process such as primary pyrolysis, secondary pyrolysis and gasification, and determining kinetic parameters for each stage. The presented methods differs from each other as they are based either on the analysis of changes in the resulting product or on the analysis of changes in the supplied feedstock, but both can be successfully used to the effective examination of kinetics of the gasification process. In addition, an important advantage of both methods is the possibility to carry out the gasification process for different solid fuels as coal, biomass, or solid waste in the atmosphere of a variety of gasification agents.

KINETIC CONSTANTS DETERMINATION OF PETROLEUM REFINERY EFFLUENT TREATMENT IN A UASB REACTOR USING RSM

2017 ◽  
Vol 16 (1) ◽  
pp. 121-130 ◽  
Author(s):  
Seyyed Mohammad Mousavi ◽  
Seyed Omid Rastegar ◽  
Seyed Abbas Shojaosadati ◽  
Soheila Sheibani
Keyword(s):  
Petroleum Refinery ◽  
Kinetic Constants ◽  
Effluent Treatment ◽  
Uasb Reactor ◽  
Refinery Effluent ◽  
Petroleum Refinery Effluent

Reactivity prediction and mechanism analysis of raw and demineralized coal char gasification

Energy ◽  
2021 ◽  
Vol 229 ◽  
pp. 120724
Author(s):  
Qing He ◽  
Yan Gong ◽  
Lu Ding ◽  
Qinghua Guo ◽  
Kunio Yoshikawa ◽  
...  
Keyword(s):  
Coal Char ◽  
Mechanism Analysis ◽  
Char Gasification ◽  
Coal Char Gasification

scholarly journals Simulation of extracellular nucleotide hydrolysis and determination of kinetic constants for the ectonucleotidases.

1986 ◽  
Vol 261 (33) ◽  
pp. 15505-15507
Author(s):  
L L Slakey ◽  
K Cosimini ◽  
J P Earls ◽  
C Thomas ◽  
E L Gordon
Keyword(s):  
Kinetic Constants ◽  
Extracellular Nucleotide ◽  
Nucleotide Hydrolysis

Noncatalytic coal char gasification

AIChE Journal ◽  
1984 ◽  
Vol 30 (4) ◽  
pp. 583-593 ◽  
Author(s):  
Sunggyu Lee ◽  
J. C. Angus ◽  
R. V. Edwards ◽  
N. C. Gardner
Keyword(s):  
Coal Char ◽  
Char Gasification ◽  
Coal Char Gasification

Design and Simulation of a Hybrid Entrained-Flow and Fluidized Bed Mild Gasifier: Part 2—Case Study and Analysis

2011 ◽  
Author(s):  
A. K. M. Monayem Mazumder ◽  
Ting Wang ◽  
Jobaidur R. Khan
Keyword(s):  
Multiphase Flow ◽  
Fluidized Bed ◽  
Flow Behavior ◽  
Flame Temperature ◽  
Heterogeneous Reactions ◽  
Thermal Flow ◽  
Entrained Flow ◽  
Progressive Development ◽  
Gasification Process ◽  
Flow And Heat Transfer

To help design a mild-gasifier, a reactive multiphase flow computational model has been developed in Part 1 using Eulerian-Eulerian method to investigate the thermal-flow and gasification process inside a conceptual, hybrid entrained-flow and fluidized-bed mild-gasifier. In Part 2, the results of the verifications and the progressive development from simple conditions without particles and reactions to complicated conditions with full reactive multiphase flow are presented. Development of the model starts from simulating single-phase turbulent flow and heat transfer in order to understand the thermal-flow behavior, followed by introducing seven global, homogeneous gasification reactions progressively added one equation at a time. Finally, the particles are introduced, and heterogeneous reactions are added in a granular flow field. The mass-weighted, adiabatic flame temperature is validated through theoretical calculation and the minimum fluidization velocity is found to be close to Ergun’s correlation. Furthermore, the predicted exit species composition is consistent with the equilibrium values.

Kinetic studies on bituminous coal char gasification using CO2 and H2O mixtures

2019 ◽  
Vol 16 (14) ◽  
pp. 1144-1151 ◽  
Author(s):  
Junwei Chen ◽  
Weibin Chen ◽  
Ru Ji ◽  
Yang Jiao ◽  
Xidong Wang
Keyword(s):  
Bituminous Coal ◽  
Kinetic Studies ◽  
Coal Char ◽  
Char Gasification ◽  
Coal Char Gasification
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