发明名称 |
Mass flow measurement, preferably for controlling chip feed to a digester |
摘要 |
A method and system are provided for controlling the feed of comminuted cellulosic fibrous material (e.g. wood chips) to a continuous digester utilizing a chips meter of variable speed. A quality of the chips related to mass flow-preferably density-is continuously determined, preferably while the material is in free fall, not immersed in liquid. The speed of the material meter is controlled in response to the quality determined to provide a target mass flow of material from the meter to the digester. A nuclear type density gauge may be utilized having a source and a detector mounted on opposite sides of a chip chute, and above the level of liquid in a chip chute so that density is determined during free fall of the chips, not immersed in liquid. A level sensor may also be associated with the chip chute with a shield between the nuclear source and the level sensor. The chip meter speed is controlled in the range of about 0-16 rpm.
|
申请公布号 |
US5266159(A) |
申请公布日期 |
1993.11.30 |
申请号 |
US19910782828 |
申请日期 |
1991.10.25 |
申请人 |
KAMYR, INC. |
发明人 |
GREENWOOD, BRIAN;DAAMEN, ANDRIES;GRAHAM, GENE |
分类号 |
D21C7/06;D21C7/12;(IPC1-7):D21C3/26 |
主分类号 |
D21C7/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|