Effect of Hydrothermal Environments on the Erosion of Castable Refractories

1977 ◽  
Vol 99 (2) ◽  
pp. 143-146 ◽  
Author(s):  
S. M. Wiederhorn ◽  
E. R. Fuller ◽  
J. M. Bukowski ◽  
C. R. Robbins
Keyword(s):  
High Pressure ◽  
Wear Resistance ◽  
Room Temperature ◽  
Coal Gasification ◽  
Wear Behavior ◽  
Erosive Wear ◽  
Chemical Changes ◽  
High Pressure Steam ◽  
Pressure Steam ◽  
Hydrothermal Environments

Hydrothermal environments are expected to adversely affect the erosive resistance of castable refractories intended for use in high wear areas of coal gasification plants. The erosive wear behavior of two grades of refractories proposed for such use was studied at room temperature after exposure of the refractories to high-pressure steam. Wear occurs primarily in the cement phase that bonds the more wear-resistant aggregate. The wear resistance of the refractories depended on chemical interactions between the cement and the high pressure steam. Although chemical changes were observed to occur in both refractories, the wear resistance was found to decrease only in those cases for which the strength of the cement phase was substantially reduced.

Localized Interaction between Coal-Included Minerals and Ca-Based CO2Sorbents during the High-Pressure Steam Coal Gasification (HyPr−RING) Process

2004 ◽  
Vol 43 (25) ◽  
pp. 7989-7995 ◽  
Author(s):  
Koji Kuramoto ◽  
Katsuyuki Ohtomo ◽  
Koichi Suzuki ◽  
Shinji Fujimoto ◽  
Sayaka Shibano ◽  
...  
Keyword(s):  
High Pressure ◽  
Coal Gasification ◽  
High Pressure Steam ◽  
Pressure Steam

Using CFD to Enhance the Preliminary Design of High-Pressure Steam Turbines

2013 ◽  
Author(s):  
Juri Bellucci ◽  
Federica Sazzini ◽  
Filippo Rubechini ◽  
Andrea Arnone ◽  
Lorenzo Arcangeli ◽  
...  
Keyword(s):  
High Pressure ◽  
Steam Turbine ◽  
Design Tool ◽  
Tip Clearance ◽  
Large Set ◽  
Preliminary Design ◽  
Steam Turbines ◽  
High Pressure Steam ◽  
Wide Range ◽  
Pressure Steam

This paper focuses on the use of the CFD for improving a steam turbine preliminary design tool. Three-dimensional RANS analyses were carried out in order to independently investigate the effects of profile, secondary flow and tip clearance losses, on the efficiency of two high-pressure steam turbine stages. The parametric study included geometrical features such as stagger angle, aspect ratio and radius ratio, and was conducted for a wide range of flow coefficients to cover the whole operating envelope. The results are reported in terms of stage performance curves, enthalpy loss coefficients and span-wise distribution of the blade-to-blade exit angles. A detailed discussion of these results is provided in order to highlight the different aerodynamic behavior of the two geometries. Once the analysis was concluded, the tuning of a preliminary steam turbine design tool was carried out, based on a correlative approach. Due to the lack of a large set of experimental data, the information obtained from the post-processing of the CFD computations were applied to update the current correlations, in order to improve the accuracy of the efficiency evaluation for both stages. Finally, the predictions of the tuned preliminary design tool were compared with the results of the CFD computations, in terms of stage efficiency, in a broad range of flow coefficients and in different real machine layouts.

Crosslinking Cotton Cellulose with a High Pressure Steam Process

2001 ◽  
Vol 71 (12) ◽  
pp. 1063-1067 ◽  
Author(s):  
Jui-Chin Chen ◽  
Wei-Hua Yao ◽  
Chien-Hsin Chen ◽  
Cheng-Chi Chen
Keyword(s):  
High Pressure ◽  
Cotton Cellulose ◽  
High Pressure Steam ◽  
Pressure Steam
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