Devices for maintaining optical access in high‐temperature coal combustion environments

1991 ◽  
Vol 62 (3) ◽  
pp. 624-629 ◽  
Author(s):  
Robert L. Cook ◽  
Leslie R. Hester
Keyword(s):  
High Temperature ◽  
Coal Combustion ◽  
Optical Access

In-situ reaction between arsenic/selenium and minerals in fly ash at high temperature during blended coal combustion

2020 ◽  
Vol 48 (11) ◽  
pp. 1356-1364
Author(s):  
Jun HAN ◽  
Yang-shuo LIANG ◽  
Bo ZHAO ◽  
Zi-jiang XIONG ◽  
Lin-bo QIN ◽  
...  
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Coal Combustion ◽  
In Situ Reaction ◽  
Blended Coal

Capture of arsenic in coal combustion flue gas at high temperature in the presence of CaSiO3 with good anti-sintering

2020 ◽  
Vol 205 ◽  
pp. 106428 ◽  
Author(s):  
Yue Cao ◽  
Bing Song ◽  
Min Song ◽  
Fanyue Meng ◽  
Yuexing Wei ◽  
...  
Keyword(s):  
High Temperature ◽  
Flue Gas ◽  
Coal Combustion

Review on Reaction Mechanisms of Sulfur Species During Coal Combustion

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Honghe Ma ◽  
Lu Zhou ◽  
Sichen Lv ◽  
Jia Wei Chew ◽  
Zhijian Wang
Keyword(s):  
High Temperature ◽  
Reaction Mechanisms ◽  
Coal Combustion ◽  
High Temperature Corrosion ◽  
Sulfur Species ◽  
Water Wall ◽  
Adequate Knowledge ◽  
Hole Wall ◽  
High Concentrations ◽  
New Research

Various low-NOx combustion technologies have been widely applied as primary measures to limit NOx emission in coal-fired boilers. However, this leads to the formation of high concentrations of H2S in the fuel-rich zone and thus causes high-temperature corrosion of the water-wall. In order to suppress the formation of H2S near the water-wall, it is necessary to have adequate knowledge of the reaction mechanisms of sulfur species during coal combustion. Therefore, this work systematically reviews the current state-of-the-art concerning reaction mechanisms for sulfur species, including global mechanisms, detailed mechanisms, and reduced mechanisms. Additionally, two operation techniques, namely, near-wall air and multi-hole-wall air, are introduced to avoid high-temperature corrosion caused by H2S. Finally, some new research directions are recommended to further reveal the reaction mechanisms of sulfur species and to test the feasibility of multi-hole-wall air on preventing high-temperature corrosion.

Corrosion and Degradation of Ceramic Particulate Filters in Direct Coal-Fired Turbine Applications

1991 ◽  
Vol 113 (4) ◽  
pp. 602-606 ◽  
Author(s):  
J. Sawyer ◽  
R. J. Vass ◽  
N. R. Brown ◽  
J. J. Brown
Keyword(s):  
High Temperature ◽  
Coal Combustion ◽  
Degradation Mechanisms ◽  
Successful Operation ◽  
Ceramic Filters ◽  
Ceramic Particulate ◽  
Free Gas ◽  
Particulate Filters ◽  
Combustion Systems ◽  
Particulate Removal

High-temperature ceramic filters show considerable promise for efficient particulate removal from coal combustion systems. Advanced coal utilization processes such as direct coal-fired turbines require particulate-free gas for successful operation. This paper describes the various ceramic particulate filters under development and reviews the degradation mechanisms expected when operated in coal combustion systems.

scholarly journals Performance of Pulverized Coal Combustion under High Temperature Air Diluted by Steam

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Mohsen Saffari Pour ◽  
Yang Weihong
Keyword(s):  
High Temperature ◽  
Coal Combustion ◽  
Fluid Dynamic ◽  
Flame Temperature ◽  
Experimental Tests ◽  
Injection Rate ◽  
Pulverized Coal ◽  
Injection Velocity ◽  
Pulverized Coal Combustion ◽  
Injection Speed

The high temperature air combustion (HiTAC) is an advanced promising technology for heat recovery, energy saving, and stability improvement of flame. Computational fluid dynamic (CFD) is known as an applied tool to execute HiTAC modeling. In this paper, performances of pulverized coal combustion under the high preheated and oxygen deficient air are studied by both experimental and numerical methodology. The experimental facilities have been accomplished in a HiTAC chamber with coal injection velocity that ranges from 10 to 40 m/s. In order to achieve different preheated temperatures, the combustion air in such system is diluted by variable steam percentages from 0 to 44%. Results of mathematical simulation and experimental tests present convincible agreement through whole region. It is concluded that NOX emission is reduced by increasing the steam percentage in the oxidizer due to decreasing the flame temperature. Besides, graphical contours show that by adding more steam to oxidizer composition, the oxygen concentration decreased. Additionally, results show that when the injection speed of fuel is increased, NOX emission is also increased, and when the injection rate of preheated air is increased, NOX emission shows decreasing trend. Further contribution in future is needed to investigate the performance of such technologies.

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