METHOD AND DEVICE FOR ESTIMATING COIL OUTER SURFACE TEMPERATURE OF ETHYLENE GENERATION/DECOMPOSITION FURNACE AND ETHYLENE MANUFACTURING DEVICE

To estimate an outer surface temperature of a coil by reflecting the temperature of even a point whose temperature is relatively high in an imaged region.SOLUTION: A device for estimating an outer surface temperature of a coil includes: an imaging camera 20 which is provided at an ethylene generation/decomposition furnace 2, and which images an imaged region 60 of a coil 8; and an image analysis device 22 for processing an output signal from the imaging camera 20, so as to estimate an outer surface temperature of the coil 8. The ethylene generation/decomposition furnace 2 includes: the coil 8 to which a hydrocarbon as a decomposition raw material and water vapor are supplied; a convection part 4 for preheating a mixed fluid in the coil 8; a radiation part 6 for heating the coil 8 with radiation heat, so as to thermally decompose the raw material; and a housing 2A for storing those.SELECTED DRAWING: Figure 1 【課題】被撮像領域に相対的に温度が高い箇所が存在する場合にも、その部分の温度を反映してコイルの外表面温度を推定する。【解決手段】このコイル外表面温度の推定装置は、分解原料である炭化水素および水蒸気が供給されるコイル８、と、コイル８内の混合流体を予熱する対流部４と、コイル８を輻射熱で加熱して原料を熱分解する輻射部６と、これらを収容する筐体２Ａとを有するエチレン生成分解炉２に設けられ、コイル８の被撮像領域６０を撮像する撮像カメラ２０と、撮像カメラ２０からの出力信号を処理することによりコイル８の外表面温度を推定する画像解析装置２２とを具備する。【選択図】図１