Experimental Study on Polymer Pyrolysis in High-Temperature Air Diluted by H2O and CO2 Using Stagnation-Point Flow

2011 ◽  
Author(s):  
Yasuhiro Ogami ◽  
Makoto Mori ◽  
Kentaro Yoshinaga ◽  
Hideaki Kobayashi
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Kinetic Parameters ◽  
Stagnation Point ◽  
Stagnation Point Flow ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Regression Rate ◽  
Extinction Limit ◽  
Polymer Pyrolysis

Combustion experiments were performed for polyethylene (PE) in stagnation-point flow to investigate the fundamental characteristics of PE in high-temperature air combustion (HiTAC). Air diluted by nitrogen, water vapor, and carbon dioxide was tested as the oxidizer, and the oxidizer temperature was varied from 300 to 773 K, to investigate the effect of the dilution and temperature on the regression rate, the extinction limit, and the sooting limit of PE. The kinetic parameters of PE pyrolysis under the combustion conditions were estimated from the regression rate experimental data using a new method combining experiments and numerical simulations. It was found that the previously reported kinetic parameters obtained with thermal gravimetric analysis (TGA) were much smaller than those obtained in this study, and that the kinetic parameters of pyrolysis were affected by dilution.

Synthesis of Novel Carbon Spheres and Study on Graphitization Process

2013 ◽  
Vol 634-638 ◽  
pp. 2293-2296
Author(s):  
Ai Li Ma ◽  
Cheng Qian Li ◽  
Wu Qing Du ◽  
Jie Chang
Keyword(s):  
High Temperature ◽  
Microwave Plasma ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Carbon Spheres ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cvd Method ◽  
Graphitization Degree ◽  
Scanning Electron

In this paper, carbon spheres were synthesized by CVD method. These carbon spheres exhibit diameters of about 200 nm. Thermal gravimetric analysis indicated the good stability in high temperature of the carbon spheres. The products were treated by microwave plasma and high temperature vacuum heat treatments respectively. The products were characterized by X-ray diffraction, Raman spectroscopy and Field Emission Scanning Electron Microscope. The study indicated that the original products, with perfect morphology and low graphitization degree, were converted to crystal. The different techniques were considered for the influence on the graphitization degree.

Evaluation on Microstructure Stability and Thermal Resistant Ability at High Temperature of Ternary-Blended Geopolymer

2021 ◽  
Vol 321 ◽  
pp. 73-79
Author(s):  
Hoc Thang Nguyen
Keyword(s):  
High Temperature ◽  
Rice Husk Ash ◽  
High Thermal Stability ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure Stability ◽  
Before And After ◽  
Materials Used

Stability of microstructure and heat resistant ability at high temperature is one of the important properties in ceramics or silicate materials which are normally exposed with fire such as refractories and insulation or other materials used in furnaces. This study used a ternary-blended geopolymer which was synthesized from an optimized mixture of red mud (RM), rice husk ash (RHA), diatomaceous earth (DE), and water glass solution (WGS) with silica modulus of 2.5. The geopolymer samples were tested thermal properties of heat resistance (%), volumetric shrinkage (%), mass loss (%) at 1000°C to evaluate thermal resistant ability. Changes of microstructure of the ternary-blended geopolymer samples were also characterized before and after exposed at high temperature using methods of X-ray diffraction (XRD), Thermogravimetric analysis or thermal gravimetric analysis (DTA-TGA), and Scanning electron microscope (SEM). The experimental results showed the ternary-blended geopolymer has high thermal stability and unchanged microstructure even at high temperatures. Hence, the geopolymer in this study is suggested to apply as an insolation with the upper limit of temperature to work at 1000°C.

High Temperature Oxidation Behaviour of DSS 2205 in Humid Air

2014 ◽  
Vol 900 ◽  
pp. 673-676 ◽  
Author(s):  
Jian Guo Peng ◽  
Mou Cheng Li
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Oxidation Behaviour ◽  
Gravimetric Analysis ◽  
Oxide Scales ◽  
Thermal Gravimetric ◽  
Humid Air ◽  
Temperature Oxidation ◽  
Increasing Temperature ◽  
Kinetics Of

The oxidation kinetics of 2205 stainless steel in humid air at high temperature were studied by adopting thermal-gravimetric analysis (TGA). The morphology, composition and microstructure of the oxide scales were analyzed using SEM and XRD. The experiment showed that few scales form on the surface of DSS2205 at less than 800°C.With increasing temperature above 800°C, thickness of oxide scales increase and the inner oxides can be found. The nodules can be observed when the temperature reaches 1050°C.

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