The isothermal studies of char-CO2 gasification using the high-pressure thermo-gravimetric method

2015 ◽  
Vol 120 (3) ◽  
pp. 1877-1882 ◽  
Author(s):  
Lang Liu ◽  
Qingcai Liu ◽  
Yan Cao ◽  
Wei-Ping Pan
Keyword(s):  
High Pressure ◽  
Gravimetric Method ◽  
Thermo Gravimetric ◽  
Co2 Gasification

Moisture Sorption Isotherms and Isosteric Heats of Sorption of High-Pressure Treated Paulownia Wood under Different Storage Conditions

2019 ◽  
Vol 62 (1) ◽  
pp. 105-114
Author(s):  
Xiuping Jiang ◽  
Xiuping Jiang ◽  
Huanhuan Li ◽  
Hosahalli S. Ramaswamy ◽  
Songming Zhu ◽  
...  
Keyword(s):  
High Pressure ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Storage Conditions ◽  
Sorption Behavior ◽  
Adsorption And Desorption ◽  
Moisture Sorption Isotherm ◽  
Moisture Sorption Isotherms ◽  
Paulownia Wood

Abstract. Understanding of moisture sorption isotherms (MSI) is critical for predicting the stability of wood during handling, transport, and storage. The aim of this study was to evaluate the adsorption and desorption isotherm characteristics of high-pressure (HP) treated paulownia wood and to identify the best-fitting model to describe its sorption behavior. The equilibrium moisture contents (EMCs) of HP-treated paulownia wood were obtained using a static gravimetric method under different storage conditions: three temperatures (20°C, 30°C, and 40°C) and five water activity (aw) levels (0.32 to 0.95). Results showed that HP parameters did not significantly affect the MSI trend of treated groups. Eight modified models (modified Chung-Pfost, modified Henderson, modified Oswin, modified Halsey, Chen-Clayton, Guggenheim-Anderson-de Boer (GAB), simply modified GAB, and Peleg) were fitted to the experimental data. The Chen-Clayton model (temperature-dependent) produced randomized residuals and the best prediction performance for both adsorption and desorption among all models. Net isosteric heat of adsorption and desorption decreased from 7.55 to 4.84 kJ mol-1 and from 18.1 to 12.2 kJ mol-1, respectively, with an increase in EMC from 7.5% to 10%. The isosteric temperature (Tß) was 352 K for adsorption and 335 K for desorption, between which all the adsorption and desorption reactions proceeded at the same rate. All thermodynamic functions were adequately characterized by a power law model. Keywords: Equilibrium moisture content, High-pressure treatment, Modeling, Moisture sorption isotherm, Paulownia wood, Temperature, Thermodynamic analysis.

Express thermo-gravimetric method for the vaporization enthalpies appraisal for very low volatile molecular and ionic compounds

2012 ◽  
Vol 538 ◽  
pp. 55-62 ◽  
Author(s):  
Sergey P. Verevkin ◽  
Ricardas V. Ralys ◽  
Dzmitry H. Zaitsau ◽  
Vladimir N. Emel’yanenko ◽  
Christoph Schick
Keyword(s):  
Gravimetric Method ◽  
Thermo Gravimetric ◽  
Ionic Compounds

scholarly journals Effects of K2CO3 and Ca(OH)2 on CO2 gasification of char with high alkali and alkaline earth metal content and study of different kinetic models

2020 ◽  
pp. 305-305
Author(s):  
Xin Yang ◽  
Zhanwei Liang ◽  
Hongwei Chen ◽  
Jixuan Wang ◽  
Xinglong Mu
Keyword(s):  
High Pressure ◽  
Catalytic Effect ◽  
Earth Metal ◽  
Open Pit ◽  
Catalyst Loading ◽  
Catalytic Gasification ◽  
Co2 Gasification ◽  
Gasification Reactivity ◽  
Shrinking Core ◽  
Loading Methods

The CO2 gasification of South Open-pit Mines coal from Zhundong Field of China using Ca(OH)2 or K2CO3 as catalyst with different loading methods and contents were conducted in thermogravimetric analysis. Comparison of the gasification reactivity and rate of coal loaded various concentration of Ca(OH)2 concluded that the increase of Ca(OH)2 loading pronouncedly improved the reactivity and rate for grinding method; nevertheless, for impregnation and high pressure method the increase of Ca(OH)2 loading observed a similar catalytic effect on char gasification. However, the catalytic effect of K2CO3 revealed that the catalytic activity increased with the increase of K2CO3 loading for three loading method. For the same catalyst loading, the highest catalytic gasification reactivity achieved for Ca(OH)2 and K2CO3 were the loading methods of high pressure and grinding, respectively. In addition, the gasification of raw char, K2CO3 loaded char and Ca(OH)2 loaded char were quantitatively evaluated by kinetic analysis using shrinking core, random pore and modified random pore models.

Component Characteristic of Lignite Semi-Coke Hydrogasification Residue

2013 ◽  
Vol 316-317 ◽  
pp. 153-156
Author(s):  
Tao Jun Lu ◽  
Yong Fa Zhang
Keyword(s):  
Diffraction Method ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Co2 Gasification ◽  
Gasification Reactivity ◽  
Reaction Conversion ◽  
Direction Of Movement ◽  
Hydrogenation Temperature ◽  
Gasification Reaction ◽  
Co2 Gasification Reactivity

The residue of Inner Mongolia lignite semi-coke by different final temperature hydrogenation system methane of CO2 gasification reactivity is studied by means of thermo gravimetric and X-Ray Diffraction method. The results show that, with the rise of hydrogasification temperature, the residue aromaticity fa increase, the residual carbon microcrystalline tend to graphitization, CO2 reactivity decrease and residue CO2 reaction temperature raise. The final hydrogenation temperature residue CO2 gasification reaction conversion rate curves similar and curve to temperature increase in the direction of movement.

Measurement of CO2 Gasification Rate of Coal Char Under High Pressure and High Temperature Using a Mini Directly-Heated Reactor

2012 ◽  
pp. 713-717
Author(s):  
Kouichi Miura ◽  
Mitsunori Makino ◽  
Eiji Sasaoka ◽  
Syunsuke Imai ◽  
Ryuichi Ashida
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Coal Char ◽  
Co2 Gasification ◽  
Gasification Rate

The Use of Thermo-Gravimetric Studies for the Assessment of Technological Properties of Quartzites for the Ferrosilicon Smelting Process

2016 ◽  
Vol 246 ◽  
pp. 63-66
Author(s):  
Janusz Węgrzyn ◽  
Bolesław Machulec
Keyword(s):  
Weight Loss ◽  
Objective Assessment ◽  
Relative Weight ◽  
Gravimetric Method ◽  
Industrial Process ◽  
Raw Material ◽  
Smelting Process ◽  
Molar Ratio ◽  
Technological Properties ◽  
Thermo Gravimetric

The most objective methods of determining the usefulness of quartzite for the ferrosilicon smelting process are industrial research methods, but such studies are long-lasting and costly. In order to test the usefulness of thermo-gravimetric method to evaluate technological properties of quartzites in a laboratory, thermo-gravimetric studies of quartzites samples from various deposits were carried out. These quartzites are used or were used as a raw material in industrial ferrosilicon process. The study consisted of measuring the weight loss of powder samples in the form of mixture of quartz with graphite of molar ratio SiO2 + 3C during heating under an argon atmosphere in the temperature range up to 1500°C. The evaluation of technological properties of quartzites was done by comparing the curves of relative weight loss with industrial technological data of the ferrosilicon smelting process. It was established that the results of thermo-gravimetric studies show satisfying agreement with observations of industrial process, whereas quartzites of improved technological properties revealed a lower weight loss in thermo-gravimetric studies. Studies of this type can be useful as one of the methods of objective assessment of usefulness of quartzites for the ferrosilicon smelting process.

scholarly journals Experimental aspects of buoyancy correction in measuring reliable high-pressure excess adsorption isotherms using the gravimetric method

2017 ◽  
Vol 28 (12) ◽  
pp. 125802 ◽  
Author(s):  
Huong Giang T Nguyen ◽  
Jarod C Horn ◽  
Matthias Thommes ◽  
Roger D van Zee ◽  
Laura Espinal
Keyword(s):  
High Pressure ◽  
Adsorption Isotherms ◽  
Gravimetric Method ◽  
Excess Adsorption ◽  
Buoyancy Correction
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