Control of Ash Deposition in Pulverized Coal Combustor

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Ichiro Naruse¹  Ryo Yoshiie¹  Hiroshi Naganuma³  Mikio Matsuura¹  Tadashi Ito⁴  Yasuaki Ueki² 

[1] Department of Mechanical Science and Engineering, Nagoya University;EcoTopia Science Institute, Nagoya University;Tohoku Electric Power Engineering and Construction, Co., Ltd.;Nippon Welding Rod Co., Ltd.

关键词: Ash Deposition;    Coal Combustion;    Thermal Spraying;   

DOI  :  10.1252/jcej.10we129

来源: Maruzen Company Ltd

【 摘 要 】

References(18)Cited-By(4)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.

【 授权许可】

Unknown