US 2019/0345673 A1Published application

Apparatus for measuring the dewatering of a paper machine at different points of the wet end and a method for implementing it

OwnerJuha Karvineninventor

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Abstract

The object of the invention is an apparatus and a method for measuring dewatering in the wet end of a paper machine. What is essential in the invention is that the measuring system (26) comprises an essentially horizontal inlet pipe (10) on the machine level (11), which pipe is installed in the measuring receptacle (27), and in that the separation of air (22) is performed in an expanded pipe section (15) made in the inlet pipe (10) and in the outlet pipe (16) connected to it. A weir plate is installed in the measuring receptacle (27) of the measuring system (26), the weir plate functioning as a measuring weir (8) for measuring the amount of the dewatering flow, and from a pressure difference transmitter (20) installed on one side, which transmitter measures the height of the water surface produced by the measuring weir (8) for measuring the amount of water (7).

Claims17

Dependent claims

Apparatus for measuring the dewatering of a paper machine at different points of the wet end in such a way that the water (7) removed from a roll (6) by means of centrifugal force or blowing is collected in a trough (3), or corresponding receptacle, and is conducted by gravity along an inlet pipe (10), characterized in that the apparatus functioning as a measuring system (26) comprises:

an essentially horizontal inlet pipe (10) on the machine level (11), which pipe is installed in the bottom part of the inlet of the deaeration chamber (17) comprised in the measuring receptacle (27),
a two-part separation of the air (22) in the water (7) in such a way that the first part comprises an expanded pipe section (15) made in the inlet pipe (10) and the outlet pipe (16) connected to it, for directing away from the pipe section (15) the air (22) separated from the water (7),
the second part of the separation of air (22) comprises a deaeration chamber (17) comprised in the measuring receptacle, one wall of which chamber is open at the bottom, functioning as a water seal (21), in which the remainder of the air (22) in the water (7) is separated to the surface of the deaeration chamber (17) and the water (7) is conducted from the wall that is open at the bottom functioning as a water seal (21) to the other side of said wall,
forming a measuring chamber (18) comprised in the measuring receptacle (27) in such a way that a weir plate is installed on the opposite side of the water seal (21), the weir plate functioning as a measuring weir (8) for measuring the amount of the dewatering flow, and a pressure difference transmitter (20) installed on one side, which transmitter measures the height of the water surface produced by the measuring weir (8) for measuring the amount of water (7).

1 more element

Method for measuring the dewatering of the wet end of a paper machine at different points in such a way that the water (7) removed from a roll (6) by means of centrifugal force or blowing is collected in a trough (3), or corresponding water receptacle, and is conducted by gravity along an inlet pipe (10), characterized in that in the method according to the measuring system (26)

measurement of the removed water (8) is performed completely on the machine level (11)
water (7) is directed from the trough (3) along an essentially horizontal inlet pipe (10) that is installed in the bottom part of the inlet of the deaeration chamber (17) comprised in the measuring receptacle (27),
deaeration (22) of the water (7) is performed in two parts in such a way that in the first part water (7) is guided into an inlet pipe (10) and onwards into an expanded pipe section (15) made in it, in which pipe section the air (22) separates from the water (7) into the top part of the pipe (15) and the separated air (22) is guided out of the pipe section (15) along an outlet pipe (16) connected to it,
in the second part of the separation of air (22) the water (7) is guided into a deaeration chamber (17) comprised in the measuring receptacle (27), one wall of which chamber is open at the bottom, functioning as a water seal (21), in which the remainder of the air (22) in the water (7) is separated to the surface of the deaeration chamber (17) and the water (7) is conducted from the wall that is open at the bottom functioning as a water seal (21) to the other side of said wall,
in the method, the measurement is performed in the measuring chamber (18) comprised in the measuring receptacle (27) in such a way that installed on the opposite side of the water seal (21) is a weir plate, which functions as a measuring weir (8) for measuring the amount of the dewatering flow, and a pressure difference transmitter (20) installed on one side, which transmitter measures the height of the water surface produced by the measuring weir (8) for measuring the amount of water (7).

2 more elements

Dependencies are inferred from the claim text.