Method for producing pulverized coal

C - Chemistry – Metallurgy – 10 – B

Patent

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Details

C10B 57/10 (2006.01) B02C 23/34 (2006.01) C21B 5/00 (2006.01) F26B 21/10 (2006.01)

Patent

CA 2731885

Method for producing pulverized coal, the method comprising the steps of heating a drying gas, preferably an inert gas, in a hot gas generator (26) to a predefined temperature; feeding the heated drying gas into a pulverizer (20); introducing raw coal into the pulverizer (20), the pulverizer (20) grinding the raw coal to pulverized coal; collecting a mixture of drying gas and pulverized coal from the pulverizer (20) and feeding the mixture to a filter (34), the filter (34) separating the dried pulverized coal from the drying gas; and collecting the dried pulverized coal for further use and feeding part of the drying gas from the filter to a recirculation line (38) for returning at least part of the drying gas to the hot gas generator (26). According to an important aspect of the present invention, the method comprises the further step of controlling an exit temperature of the mixture of drying gas and pulverized coal exiting the pulverizer (20) by controlling a volume of water injected into the heated drying gas before feeding it into the pulverizer (20).

L'invention concerne un procédé de production de charbon pulvérisé, ce procédé comprend les étapes consistant à chauffer un gaz déshydratant, de préférence un gaz inerte, dans un générateur de gaz chaud (26) à une température prédéfinie; à alimenter le gaz déshydratant chauffé dans un pulvérisateur (20); à introduire le charbon brut dans le pulvérisateur (20), ce dernier (20) broyant le charbon brut en charbon pulvérisé; à collecter un mélange de gaz déshydratant et de charbon pulvérisé par le pulvérisateur (20) et à alimenter le mélange dans un filtre (34), ce filtre (34) séparant le charbon pulvérisé sec en vue d'une utilisation ultérieure et la partie d'alimentation du gaz déshydratant du filtre vers un conduit de recirculation (38) afin de retourner au moins une partie du gaz déshydratant dans le générateur de gaz chaud (26). Selon un aspect important de l'invention, le procédé comprend l'étape de commande d'une température de sortie du mélange de gaz déshydratant et de charbon pulvérisé sortant du pulvérisateur (20) par régulation du volume d'eau injecté dans le gaz déshydratant chauffé avant de l'alimenter dans le pulvérisateur (20).

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