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    Method of automatically controlling the roasting of materials containing roastable sulphur
    6.
    发明专利
    Method of automatically controlling the roasting of materials containing roastable sulphur 未知

    公开(公告)号：GB886786A

    公开(公告)日：1962-01-10

    申请号：GB2043460

    申请日：1960-06-10

    Applicant: BASF AG

    Inventor： WITTMANN GEORG ,  HENGST KONRAD ,  STUMPFI HANS

    IPC: C01B17/52 ,  C22B1/10

    Abstract: In the roasting of materials containing roastable sulphur in two fluidized layers with a separate supply of an oxygen-containing gas to each layer, the amount of oxygen-containing gas supplied to the first (pre-roasting) layer is automatically controlled by a regulator situated in the second (after-roasting) layer so that a rise in temperature in the second layer reduces the supply of oxygen-containing gas and vice versa, and the supply of raw material to the first layer is automatically controlled by a regulator situated in the first layer so that when the temperature in the first layer rises above a certain level more raw material is supplied, and vice versa, thereby tending to keep the temperature constant. The oxygen-containing gas supply to the second layer is preferably so controlled by a regulator that the supply remains constant regardless of the height of the layer. The heights of the individual layers may be controlled independently of the supply of material thereto, by means of pressure or differential pressure regulators which control the solids discharge means from the layers. Preferably the supply of oxygen-containing gas to the first layer is controlled by a regulator which is varied within fixed limits about a hand-set mean value by the temperature sensitive device in the second layer. In the figure, raw material from hopper 1 is fed into the first fluidised (preroasting) layer 4 by means of a plate feeder 2, the rate of feed being controlled by a temperature sensitive device 11. The supply of oxygen-containing gas to the first layer is controlled by temperature sensitive device 14, which is situated in the second fluidised (after-roasting) layer 7. Pressure regulator 12 controls the rate of discharge of solids from layer 4 to layer 7, and pressure regulator 15 controls the discharge of solids from layer 7. The regulator 16 maintains a constant rate of supply of oxygen-containing gas to layer 7. Any dust leaving cyclone 6 is burnt in a combustion zone 9, the supply of oxygen-containing gas to this zone being controlled by temperature regulator 17 in such a way that the temperature reaches a maximum.

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