Investigation of forestry wastes: Torrefaction and their thermal properties for use in energy recovery schemes

2017 ◽  
Vol 40 (1) ◽  
pp. 100-107
Author(s):  
Gohar Ayoub ◽  
Javaid Akhtar ◽  
Maham Rana ◽  
Muhammad Qasim ◽  
Naseer Sheikh ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Energy Recovery ◽  
Recovery Schemes

Evaluation of the washability characteristics of Khushab coal (Pakistani) by heavy media separation process

2017 ◽  
Vol 28 (5-6) ◽  
pp. 598-607 ◽  
Author(s):  
Hafiz Sana ◽  
Sumaira Kanwal ◽  
Javaid Akhtar ◽  
Naseer Sheikh ◽  
Shahid Munir
Keyword(s):  
Energy Recovery ◽  
Power Plants ◽  
Calorific Value ◽  
Environmental Issues ◽  
Thermochemical Conversion ◽  
Low Grade ◽  
Particle Sizes ◽  
Clean Coal ◽  
Recovery Schemes ◽  
Combustion Technique

The use of high-sulfur Pakistani coals can cause serious problems of slagging and fouling in thermochemical conversion reactors along with environmental issues like acid rain, etc. In this study, a pre-combustion technique, namely heavy media separation, is employed for the cleaning of low-grade Pakistani coal. Six crushed coal samples of different particle sizes were individually subjected to heavy media solutions of ZnCl2 of different specific gravities. It was found that the sample with a particle size of −6.25+4 mm at specific gravity of 1.4 produced the optimum float product as clean coal, showing 83.53% yield of clean coal with 1.24% ash and 1.0% sulfur contents. An overall reduction of 91.68% in ash and 86.11% sulfur contents was obtained. Moreover, up to 19.3% enhancement of gross calorific value was achieved. The resultant clean coal can be used in various energy recovery schemes in Pakistan such as coal-fired power plants and cement industries.

scholarly journals Effect of Velocity Slip on Head Prediction for Centrifugal Pumps as Turbines

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaohui Wang ◽  
Junhu Yang ◽  
Zhengting Xia ◽  
Yan Hao ◽  
Xiaorui Cheng
Keyword(s):  
Prediction Model ◽  
Energy Recovery ◽  
Velocity Slip ◽  
Centrifugal Pumps ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Turbine Mode ◽  
Recovery Schemes ◽  
Slip Phenomenon ◽  
Good Agreement

The application of pumps as turbines (PAT) has been developed in several applications for energy recovery schemes. Therefore, establishing a performance correlation between pump mode and turbine mode is essential for selecting the proper machine. However, slip phenomenon is the challenges of head prediction for PAT. In this paper, the slip phenomenon of pump and PAT was revealed, and the slip factor was studied using CFD. The effect of slip on head prediction for PAT was analyzed, and a theoretical prediction model was presented considering slip factors. In order to validate the head prediction model, six centrifugal pumps with specific speed (ns) from 9 to 54.8 were tested as turbines. Results showed that the predicted head by the proposed method was in good agreement with the experimental data, and it is more accurate than Stepanoff, Alatorre-Frenk, Sharma, and Derakhshan models. This method can be applied in head prediction for low specific speed PAT ( ns <60).

The thermal properties of some amine tetraphenylboron salts8-Quinolinol and its derivatives

1960 ◽  
Vol 23 ◽  
pp. 332-336 ◽  
Author(s):  
W WENDLANDT ◽  
J VANTASSEL ◽  
G ROBERTHORTON
Keyword(s):  
Thermal Properties

Thermal properties of an erbium-doped fibre amplifier

1990 ◽  
Vol 137 (3) ◽  
pp. 155 ◽  
Author(s):  
C.A. Millar ◽  
T.J. Whitley ◽  
S.C. Fleming
Keyword(s):  
Thermal Properties ◽  
Fibre Amplifier ◽  
Erbium Doped

Thermal properties of Sr0,3Ba0,7Ti1-yZryO3ferroelectric ceramics: Dependence on sample’s porosity

2005 ◽  
Vol 125 ◽  
pp. 309-311 ◽  
Author(s):  
S. García ◽  
E. Marín ◽  
O. Delgado-Vasallo ◽  
J. Portelles ◽  
G. Peña Rodríguez ◽  
...  
Keyword(s):  
Thermal Properties

THE THERMAL PROPERTIES OF AMORPHOUS ARSENIC AT LOW TEMPERATURES

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-978-C6-979 ◽  
Author(s):  
D. P. Jones ◽  
N. Thomas ◽  
W. A. Phillips
Keyword(s):  
Thermal Properties ◽  
Low Temperatures
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