Research on Application for the Thermal Purpose of a Large-Sized Silicon Carbide Material

Sakai, Yukifumi; Ohta, Kazuo; Yamazaki, Masatoshi; Sakusabe, Hiromi

doi:10.2472/jsms.61.967

J. Soc. Mat. Sci., Japan

2012

DOI: 10.2472/jsms.61.967

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Research on Application for the Thermal Purpose of a Large-Sized Silicon Carbide Material

Yukifumi Sakai¹,

Kazuo Ohta²,

Masatoshi Yamazaki³

et al.

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Cited by 2 publications

References 3 publications

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Application of a Large-Sized Pressureless-Sintered Silicon Carbide for the Immersion Tube of Molten Metal

Sakai¹,

Ono²,

Seko³

et al. 2013

J. Soc. Mat. Sci., Japan

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We have developed a gas-fired immersion heater tube for use with melting furnaces for the processing of molten zinc. The tubes are made out of a pressureless sintered silicon carbide. The tubes single-ended have dimensions of either φ230 × φ210 × 2300mm or φ310 × φ290 × 1000mm. In this study, we examined thermal shock resistance upon water quenching, measured the gas temperature along the tubes, and simulated their tube wall temperature strength/stress distributions. Maximum stress of tube occurs just above the ring of contact with the surface of the molten zinc, where the temperature differential is the maximum. By inserting a thermal insulation sleeve (alumina silicate cloth) within the immersion heater tube, stress is decreased from 51.5MPa to 22.5MPa. The stress on dipping slant, which occurred at mechanical fixing part of tube, were not so large. We also checked the resistance of immersion heater tubes to molten zinc corrosion within actual production furnaces. We have found that within industrial zinc furnaces, the tubes can keep to operate on good condition (i.e., corrode only partially) after 6 years of service with normal burners and 4 years of service with regenerative burners.

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Application of a Large-Sized Pressureless-Sintered Silicon Carbide for the Immersion Tube of Molten Metal

Sakai¹,

Ono²,

Seko³

et al. 2013

J. Soc. Mat. Sci., Japan

View full text Add to dashboard Cite

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Application of a Large-Sized Pressureless-Sintered Silicon Carbide to a Heat Transfer Tube of Incinerator of Waste

Sakai¹,

Yoshida²,

Arai³

et al. 2015

J. Soc. Mat. Sci., Japan

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We have developed a heat-transfer tube for use as a heat exchanger in waste gasification and melting systems. This heat-transfer tube, which is made of a pressureless-sintered silicon carbide material, is a single end-type with cantilever support. Ceramic heat-transfer tubes fixed both ends to a metallic heat exchanger body are easily broken, due to differences in thermal expansion at high temperatures, but silicon carbide tubes on a cantilever support do not have this problem. We measure basic properties of the heat-transfer tube such as the coefficient of heat transfer and corrosion resistance, and discuss ash removal. We conduct a low-temperature heat transfer experiment, using saturated steam at 0.4 MPa pressure as a heating medium, and actual exhaust gas from a waste gasification and melting system at about 1150 K as a high-temperature range. Air of 290 K, 79.2 m 3 [normal]/h reaches 820 K after two heat exchanger passes. Near the dew point, silicon carbide shows high corrosion resistance to the exhaust gas. Regarding ash removal, sandblasting effectively cleans the tube surface, because of hardness of a pressureless-sintered silicon carbide material. We simulate application of a large heat transfer tube, about ϕ200 × ϕ179 × 1800 mm, in a furnace. Results indicate that a heat transfer tube made of pressureless-sintered silicon carbide is suited to waste gasification and melting systems.

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Research on Application for the Thermal Purpose of a Large-Sized Silicon Carbide Material

Cited by 2 publications

References 3 publications

Application of a Large-Sized Pressureless-Sintered Silicon Carbide for the Immersion Tube of Molten Metal

Application of a Large-Sized Pressureless-Sintered Silicon Carbide for the Immersion Tube of Molten Metal

Application of a Large-Sized Pressureless-Sintered Silicon Carbide to a Heat Transfer Tube of Incinerator of Waste

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