重油だき高負荷炉筒における伝熱の実験的研究

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タイトル別名
  • An Experimental Study on Heat Transfer in a Heavily Loaded Oil-Fired Flue
  • ジュウユ ダ キ コウフカロトウ ニ オケル デンネツ ノ ジッケンテキ ケンキュウ

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A new type of cylindrical boiler was successfuly developed in Japan to shut out almost completely the older types from the market. One important point about the new boiler is that the furnace heat release is nearly twice that of the older types. It might be suspected that the heavy load would cause overheating of the flue. To investigate the heat transfer characteristics of the flue, a test flue was placed in a tank to generate steam under atmospheric pressure. The heat flux and the surface temperature were measured at 9 points distributed on the flue. The furnace heat release was up to 1.3×106 kcal/m3h, which is in excess of the maximum rating of the actual boiler. When compared with the boiling heat transfer coefficients previously reported by the authors for small flat surfaces in a vessel, the coefficients at the top and side of the flue were in agreement, but the coefficient at the bottom of the flue was inferior to the downward facing small surface. The heat flux was smaller at the bottom. No overheating was observed at any point on the test flue even under such an extreme test conditions that the heat release was largest and protective brick layer at the bottom of the flue was removed.

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