巻号一覧
55 巻 (2017)
- 6 号 p. 289-
- 5 号 p. 234-
- 4 号 p. 158-
- 3 号 p. 106-
- 2 号 p. 50-
- 1 号 p. 3-
前身誌
55 巻, 2 号
選択された号の論文の4件中1～4を表示しています
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論文
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熱伝導逆問題解析による耐火物の厚さ測定に関する基礎的研究 第1報遠藤 英樹, 阪上 隆英, 斉田 圭佑, 久保 司郎原稿種別: 論文
2017 年 55 巻 2 号 p. 50-59
発行日: 2017/03/25
公開日: 2017/04/27
ジャーナル フリーThe hot-blast stove in steel mills is an enormous heat exchanger for sending hot air to the blast furnace. Hot-blast stoves employed under high-temperature environment are protected by refractory. These facilities suffer from a loss of refractory during longstanding use. When the refractory is damaged, SCC occurs in the steel shell. To avoid damages in steel shell, it is important to estimate the remaining life based on the thickness of refractory. However, no simple non-destructive inspection technique is available for measuring the thickness of the refractory when the blast stove is running.
In the present study, a method is presented to estimate the thickness of the refractory of the outermost layer that protects the steel shell of the hot-blast stove from the temperature variation of the outer surface. From the results of numerical experiments in the case of refractories of the hot-blast stove, it was found that the application of the inverse analysis method using a time delay is useful.抄録全体を表示PDF形式でダウンロード (461K) -
熱伝導逆問題解析による耐火物の厚さ測定に関する基礎的研究 第2報遠藤 英樹, 阪上 隆英, 斉田 圭佑, 久保 司郎原稿種別: 論文
2017 年 55 巻 2 号 p. 60-69
発行日: 2017/03/25
公開日: 2017/04/27
ジャーナル フリーThe hot-blast stove in steel mills is an enormous heat exchanger for sending hot air to the blast furnace. The hot-blast stove must be continued to operate, while the blast furnace is running. One of the causes of shutdown of hot-blast stove is an accident due to the damage of the refractory. It is important to know the life of the refractory material to protect the iron skin, for the prevention of accidents.
The authors have proposed an inverse analysis method to estimate the thickness of the refractory from the delay time due to heat conduction. This paper describes a method for determining the thickness of the refractory of the hot-blast stove using the temperature change in the furnace caused by the operation. First, focusing on the temperature change of the casing, we examined how to extract the damaged part of the refractory. Secondly, we examined how to remove the influence of the noise from the measurement data in order to accurately obtain a delay time due to heat conduction. Further,we estimated the thickness of the refractory, using the proposed method. It was found that the thickness can be estimated by the proposed method with good accuracy.抄録全体を表示PDF形式でダウンロード (733K)
解説
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吉田 聖一原稿種別: 解説
2017 年 55 巻 2 号 p. 70-76
発行日: 2017/03/25
公開日: 2017/04/27
ジャーナル フリーOn March 31, 2014, LNG Peak Shaving Plant of Williams Partners Operation LLC in Plymouth, Washington, USA experienced a catastrophic failure and a resulting explosion on a portion of the facility's purification and regeneration system. Five employees were injured. A large-sized LNG storage tank was damaged by ejected debris. The penetration of the outer shell in the storage tank caused the perlite insulation leakage. The Pipeline Hazardous Materials Safety Administration (PHMSA) of U. S. Department of Transportation and the Washington Utilities and Transportation Commission (WUTC) conducted a combined investigation into the causes of the incident. The investigation report released on April 28, 2016. This paper describes this incident based on the PHMSA & WUTC report.抄録全体を表示PDF形式でダウンロード (573K) -
-面内繰り返し曲げ変位荷重を受けるエルボ配管の累積歪推定を中心として-浦部 吉雄原稿種別: 解説
2017 年 55 巻 2 号 p. 77-86
発行日: 2017/03/25
公開日: 2017/04/27
ジャーナル フリーLow cycle fatigue strength of elbow piping subjected to in-plane cyclic bending displacement is extremely less than the best-fit fatigue curve or the Manson's fatigue curve of the test material because of damage of cumulative strain. However, it is very difficult to calculate accurate cumulative strain by the conventional multi-purpose structural analysis codes. The author proposes to estimate equivalent cumulative strain by combining the advanced revised universal slope method with the cumulative damage rule considering multi-axial stress degree. He also discusses the reason why the accuracy of the proposed method reduces in the region of high fatigue damage ratio Df and an example of engineering application of the proposed method. Finally, he discusses the margin of the ASME design fatigue curve from the view-point of the cumulative damage rule considering multi-axial stress degree.抄録全体を表示PDF形式でダウンロード (309K)
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