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US 11,634,866 B2Granted
Apparatus for measuring the dewatering of a paper machine at different points of the wet end and a method for implementing it
AssigneeRuntech Systems Oy
InventorJuha Karvinen
Life of this patent
Estimating the term…
Abstract
An apparatus for measuring dewatering in the wet end of a paper machine includes a measuring receptacle functioning at normal air pressure, in which receptacle the amount of the water of the negatively-pressurized dewatering points of the paper machine is measured by means of a pressure-difference transmitter and of a measuring weir.
Claims18
An apparatus for measuring the dewatering of a paper machine at different dewatering points of a wet end of the machine, the apparatus comprising:
- a measuring receptacle functional as a meter under normal air pressure, in which meter water of the dewatering points subject to negative pressure is measured;
- a plurality of suction leg pipes operable under negative pressure and directing the water from a respective dewatering point into a plurality of water seal compartments disposed in the measuring receptacle;
- a plurality of weir plates, each weir plate installed between a respective one of the plurality of water seal compartments and a pumping compartment, each weir plate functional as a measuring weir for measuring the amount of dewatering flow;
- a plurality of pressure-difference transmitters, each pressure-difference transmitter installed on a respective one of the plurality of water seal compartments and configured to measure the height of the water surface produced by a corresponding measuring weir for measuring the amount of water;
- and
- a plurality of deaeration plates, each deaeration plate installed between a suction leg pipe of the plurality of suction leg pipes and a corresponding measuring weir;
- wherein water discharges from the measuring weir installed on one wall of the water seal compartment into the pumping compartment, and in that the different measuring weirs of the meter are installed on opposite sides of the pumping compartment wherein the water discharges from the measuring weir of the compartment into the pumping compartment towards the fixed wall of the water seal compartment of the other meter on the opposite side to it.
4 more elements
A method for measuring the dewatering of a paper machine at different dewatering points of a wet end of the machine, wherein water is removed by negative pressure in a suction box and the water removed into the suction box is conducted along a plurality of suction leg pipes, the method comprising:
- measuring water of the dewatering points of the paper machine subject to negative pressure in a measuring receptacle functioning as a meter at normal air pressure;
- guiding water from a dewatering point by gravity along respective ones of a plurality of negatively-pressurized suction leg pipes into the measuring receptacle and discharging into a plurality of water seal compartments below the water surface;
- and
- separating air from the water via a deaeration plate, the plate forcing air arriving with the water upwards to the surface along the deaeration plate and a container wall of the measuring receptacle,
- wherein in the method, the measuring is performed by a weir plate installed between each of the plurality of water seal compartments and a pumping compartment, the weir plate functioning as a measuring weir for measuring dewatering flow, and a pressure-difference transmitter that measures the height of the water surface produced by the measuring weir for measuring the amount of water, and
- wherein the water discharges from the measuring weir installed on one wall of the water seal compartment into the pumping compartment, and different measuring weirs of the meter are installed on opposite sides of the pumping compartment wherein the water discharges from the measuring weir of the respective water seal compartment into the pumping compartment towards a fixed wall of the water seal compartment of another meter on the opposite side to it.
3 more elements
An apparatus for measuring the dewatering of a paper machine comprising:
- a measuring receptacle open to ambient air pressure, the measuring receptacle for receiving water from a plurality of dewatering points of the paper machine, the measuring receptacle including a plurality of water seal compartments and a pumping compartment;
- and
- a plurality of suction leg pipes under negative pressure, each of the plurality of suction leg pipes directing the water from a respective one of the plurality of dewatering points into a respective one of the plurality of water seal compartments so that the water is discharged below a water surface of the water seal compartment,
- wherein each water seal compartment includes a measuring weir disposed between the water seal compartment and the pumping compartment for measuring water flow flowing from the water seal compartment into the pumping compartment and a differential pressure transmitter for measuring the water level of the water seal compartment, wherein the measured water flow and water level permit the amount of water discharged from each of the plurality of dewatering points into the water seal compartment to be determined independently.
1 more element
Dependencies are inferred from the claim text.