Mass flow measurement, preferably for controlling chip feed to a

Details Mass flow measurement, preferably for controlling chip feed to a Mass flow measurement, preferably for controlling chip feed to a

1991-10-25

1993-11-30

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 52, 162246, 162198, 162262, 162263, 162252, D21C 326

Patent

active

052661598

ABSTRACT:
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.

REFERENCES:
patent: 3822179 (1974-07-01), Chari
patent: 3898124 (1975-08-01), Olson
patent: 4071399 (1978-01-01), Prough
patent: 4239590 (1980-12-01), Prough
patent: 4506541 (1985-03-01), Cunningham
patent: 4582992 (1986-04-01), Atwell

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