POWDER INJECTION METHOD

PROBLEM TO BE SOLVED: To provide a powder injection method capable of suppressing fluctuation of a measured value at the time of switching of a measurement method for a discharge flow rate by reducing an error in measurement of the discharge flow rate with a powder flowmeter.SOLUTION: A method inclu...

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Bibliographische Detailangaben
Hauptverfasser: YANAI KEIJI, SAITO MINORU, WATANABE KENTA, IWASHITA TOMOHIRO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a powder injection method capable of suppressing fluctuation of a measured value at the time of switching of a measurement method for a discharge flow rate by reducing an error in measurement of the discharge flow rate with a powder flowmeter.SOLUTION: A method includes: a step of supplying powder 31 to a pressure equalization tank 1; a step of performing measurement by a mass measuring device 19 in a state where the pressure equalization tank 1 is at an atmospheric pressure, and calculating a supply mass of the powder supplied to the pressure equalization tank 1 by using a measurement value of the mass measuring device 19; a step of supplying the powder stored in the pressure equalization tank 1 to a feed tank 2 in a state where the pressure in the pressure equalization tank 1 is equalized with that of the feed tank 2; a step of injecting the powder of the supply mass from the feed tank 2 into a furnace 41 via a transportation pipe 8 while measuring a discharge flow rate by a powder flowmeter 4; and a step of calibrating a calibration curve of the powder flowmeter 4 so that the measurement value of the discharge flow rate by the powder flowmeter 4 coincides with the discharge flow rate calculated using the supply mass.SELECTED DRAWING: Figure 2 【課題】粉体流量計による排出流量の測定において誤差を低減することにより、排出流量の測定方法の切替え時に測定値が変動するのを抑制できる粉体の吹込み方法を提供する。【解決手段】粉体31を均圧タンク1に供給するステップと、均圧タンク1が大気圧である状態で質量測定装置19による測定を行い、質量測定装置19の測定値を用いて均圧タンク1に供給された粉体の供給質量を算出するステップと、均圧タンク1をフィードタンク2と均圧した状態で、均圧タンク1に貯蔵された粉体をフィードタンク2へ補給するステップと、粉体流量計4によって排出流量を測定しながら、供給質量の粉体をフィードタンク2から輸送配管8を介して炉41内に吹込むステップと、粉体流量計4の測定値による排出流量が、供給質量を用いて算出される排出流量と一致するように、粉体流量計4の検量線を校正するステップと、を含む。【選択図】図2