Control of Ash Deposition in Pulverized Coal Combustor
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- Naruse Ichiro
- Department of Mechanical Science and Engineering, Nagoya University
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- Yoshiie Ryo
- Department of Mechanical Science and Engineering, Nagoya University
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- Matsuura Mikio
- Department of Mechanical Science and Engineering, Nagoya University
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- Ueki Yasuaki
- EcoTopia Science Institute, Nagoya University
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- Naganuma Hiroshi
- Tohoku Electric Power Engineering and Construction, Co., Ltd.
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- Ito Tadashi
- Nippon Welding Rod Co., Ltd.
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Abstract
A thermal spraying technique was adopted to change the surface properties of heat exchanger tubes in pulverized coal fired boilers in order to reduce ash deposition. Initially, four types of coal ash with different melting points were tested as samples for ash deposition experiments. As a result, ash particles with higher fouling factor selectively adhered on the tube surface. Even for the ash particles with lower melting point, Ni alloy as a thermal spraying material played an effective role in reducing deposition. Ni alloy can reduce the ash deposition by limiting formation of molten slag at high temperature. In addition, long-term ash adhesion experiments were also carried out using a precise tension tester at high temperature. The effectiveness of the Ni alloy was also proved after long term contact between an ash pellet and a rod thermally sprayed Ni alloy at high temperature. This is because the Ni alloy can control the diffusion of Fe compounds from the tube rod to the ash deposition layer.
Journal
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- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
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JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 43 (10), 872-879, 2010
The Society of Chemical Engineers, Japan
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Details 詳細情報について
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- CRID
- 1390001204568701696
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- NII Article ID
- 10028157233
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- NII Book ID
- AA00709658
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- ISSN
- 18811299
- 00219592
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- NDL BIB ID
- 10921491
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed