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公开(公告)号：EP1192425A4
公开(公告)日：2006-12-06
申请号：EP00912250
申请日：2000-03-24
摘要： A method of determining an inlet flow rate (Finlet) of a flowable material including passing an inlet stream of flowable material through a chamber (20) having an outlet aperture (100); measuring a first rate of change of quantity of material in the chamber (20) when the material is entering at said inlet flow rate; measuring a second rate of change of quantity of material in the chamber (20) when no material is entering the chamber (20); and calculating the inlet flow rate (Finlet) from said first and second rates, wherein both rate measurements are made while the whole of the outlet aperture (100) of the chamber (20) is occupied by the flowable material.
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公开(公告)号：EP0677119A4
公开(公告)日：1996-02-28
申请号：EP93901962
申请日：1993-01-08
申请人： COMALCO ALU
IPC分类号： C25C20060101 , C25C3/14
CPC分类号： C25C3/14
摘要： A continuous feeder for feeding alumina to an aluminium reduction cell is positioned over a discharge outlet (114) of an alumina hopper. The feeder includes a flow control valve member (140) which is connected to a positioning means (132) by rod (142). The flow control valve member (140) includes a tapered section such that varying the vertical position of member (140) varies the clearance between the member (140) and an outlet orifice, which allows control over the flow rate of alumina from the hopper. The alumina flow control means is preferably mounted within an elongate tubular member (130), which is further mounted inside a housing (120). Housing (120) allows for removal of the flow control means for maintenance without having to first empty the hopper.
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