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ルツボ式電気保持炉に於ける |
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非繊維系高断熱材の断熱効果 熱通過モデル |
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| 非繊維系高断熱材施工例 |
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炉内側 |
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断熱材厚さ合計 230mm |
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炉外側 |
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加熱雰囲気 |
軽量耐火断熱煉瓦 |
非繊維系 |
耐火断熱煉瓦 |
セラッミク |
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870℃ |
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高断熱材 |
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ファイバー |
周囲温度 |
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115mm |
25mm |
65mm |
25mm |
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35℃ |
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熱伝導率
λ0.24 |
λ0.026 |
λ0.26 |
λ0.09 |
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| 溶湯720℃ |
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t 1 |
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t
2 |
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t
3 |
炉体表面 |
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680.4 |
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300.0 |
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201.1 |
68.0 |
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〔℃〕 |
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〔℃〕 |
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〔℃〕 |
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通過熱量 （放散熱量） 396W/㎡ |
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| 従来施工、断熱材経年劣化例 （非繊維系高断熱材無し） |
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炉内側 |
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断熱材厚さ合計 230mm |
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炉外側 |
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加熱雰囲気 |
軽量耐火断熱煉瓦 |
耐火断熱煉瓦 |
セラッミク |
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870℃ |
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ファイバー |
周囲温度 |
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115mm |
65mm |
50mm |
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35℃ |
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熱伝導率
λ0.275 |
λ0.275 |
λ0.09 |
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| 溶湯720℃ |
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t
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t
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炉体表面 |
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611.8 |
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465.8 |
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86.5 |
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〔℃〕 |
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〔℃〕 |
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〔℃〕 |
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通過熱量 （放散熱量） 643W/㎡ |
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| ※ 上記2例を＃800型保持炉 (φ1420mm×H 860mm) で 放散熱量を比較すると |
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| 2例の 1㎡
あたりの放散熱量差は247W、 炉体外周面から放散する熱量差は |
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| 外周面面積 （3.5㎡）×247W ＝865W 1日（24hr）分の差は20.8kWh |
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