DE102009027798A1 - Device for air-water separation and draining amount measurement of water at pipe suction device in paper machine, has microwave sensor and measuring chamber that is communicatively connected with backwater chamber - Google Patents

Abstract

The device has a measuring container (1) for containing fluid whose volumetric flow rate is measured. The container has a backwater chamber (15), a drainage chamber (14) and an air separation chamber (18) connected with each other. A connection opening from the backwater chamber to the drainage chamber by an orifice plate is selected such that defined back water is formed in the backwater chamber. A measuring apparatus measures height of the backwater and/or a fluid column, and has a microwave sensor (9) and a measuring chamber (13) that is communicatively connected with the backwater chamber.

Description

The The invention relates to a measuring device for air separation and Volume flow measurement of liquids or suspensions, In particular, the invention relates to a device for the measurement of dewatering quantities of suction devices like tube suckers of paper machines.

at Paper production is done by dewatering the paper web at various points in the paper machine, for example in the area of the wire section, the press section or the dryer section. For It is important to the papermaker, the dewatering quantities, that is, the volume flow of the dewatered liquid, to know very well.

to Measurement of accumulating liquids, including fibrous materials and / or additives may be so-called Dewatering quantity measuring boxes used.

about the determined dewatering performance can be the papermaker the necessary decisions, such as For example, the time of the next one Take a napkin or the next felt cleaning.

Of Furthermore, it is of particular importance to know when a new one Built-in felt reaches its optimum operating condition as the Paper machine only then with the highest production speed can be operated and their too early increase would lead to tearing of the paper web.

at an optimal setting of the drainage services In the individual sections energy savings are made in the overall process.

At The felt belts are dehydrated in the Usually by means of a vacuum cleaner the vacuum with the liquid suck from the felt belt. The extracted air-water mixture (approx. 99% air and 1% water) is used to separate the air-water mixture Pipes are sucked by a pump into a container.

in the inside the container, the flow velocity slows down and the liquid separates by its own weight from the much lighter air. The air is going up sucked off and the liquid collects in the lower part of the container in front of a metering orifice, through which only one can drain defined amount of liquid, so that it varies depending on the drainage performance Backwater levels come.

Of the Container must to a certain degree of separation to reach, have a very large calming zone, since too high a liquid content in the exhaust air damage the downstream pump or blower could.

With Help of a pressure transmitter is the hydrostatic pressure of the backward fluid flow measured and from this the dewatering performance is determined.

The Although measuring method using a pressure transmitter is generally as reliable, but it comes through relatively easily Deposits and turbulences, to measurement inaccuracies.

In the DE 10 2005 048 053 A1 For example, a similar measuring apparatus for a vacuumless liquid quantity measurement will be described.

Of the Invention is therefore based on the object, a device for Air separation and volume flow measurement of liquids or to develop suspensions of the aforementioned type, so that the degree of separation, the measurement accuracy and process reliability be improved.

According to the invention the object by a measuring device with the features of the claim 1 solved. The subclaims describe advantageous and particularly expedient embodiments of Invention.

The Device for air separation and volume flow measurement of liquids, especially for the measurement of dewatering quantities in paper machines, consists essentially of a measuring container for receiving a liquid whose volume flow is measured shall be.

In which the measuring container has at least three chambers, one Air separation chamber with an inlet, a backflow chamber and a drain chamber with a drain.

All Chambers are interconnected, with the connection opening from backflow chamber to the drainage chamber from a metering orifice, which has a defined opening is determined.

The Measuring port is chosen so that in the back pressure chamber forms a defined backwater. The high of Fluid column, which is due to the backwater is measured, and by means of the measured value, the flow rate certainly.

advantageously, the measuring device consists of a measuring chamber, which is connected to the back pressure chamber is communicatively connected, such as preferably a bypass, and a sensor of the level in the measuring chamber measures.

In which the sensor is preferably a microwave sensor, which by means of of the radar principle.

• – die Messung berührungslos erfolgt,
• – Eigenschaften des Messmediums (Dichte, Leitfähigkeit, Temperatur, usw) die Messung nicht beeinflussen
• – die Verschmutzungsanfälligkeit sehr gering ist.
• – der Wartungsaufwand sehr gering ist.

Through the use of a microwave sensor in the Baypass, the measurement accuracy is significantly improved by:

• - the measurement takes place without contact,
• - Properties of the measuring medium (density, conductivity, temperature, etc.) do not influence the measurement
• - The susceptibility to pollution is very low.
• - The maintenance is very low.

The Luftabscheidevorrichtung consists of a Luftabscheidekammer and a suction air connection, so that at the inlet and thus also in the measuring tank a negative pressure can be generated.

Of the Inlet essentially takes place from above into the backflow chamber or in the upper part of the air separation chamber. Where the best Effect with an inlet of the tangential into the Luftabscheidekammer to achieve.

The Luftabscheidekammer is preferably according to the invention, as well as the whole measuring container, cylindrical and on the cylinder wall of the air separation chamber is an air baffle so attached that the flow through the air baffle spirally directed from the inlet down.

The Orifice is preferably designed to be interchangeable is. In addition, this can be an adjustable orifice exhibit.

Of Furthermore, the measuring aperture opening can be designed such that that the outgoing flow rate changes with Backwater level antiproportional changes.

Of the Drain is in the drain chamber below the aperture attached, preferably in the bottom region of the drain chamber.

The Measuring chamber can be outside or inside the backpressure chamber be positioned and parallel to the measuring chamber may additionally a bypass sight glass be positioned, which then also communicates connected to the measuring chamber.

The solution according to the invention is hereinafter explained with reference to figures. In detail is the following shown:

1 shows a sectional view of an inventive measuring device for a suction device with air-liquid separator.

2 shows the measuring device of 1 from a different perspective

3 shows an example of some apertures

1 shows a sectional view of an inventive measuring device for a suction device with air-liquid separator.

So is z. B. by means of tube suckers, the water from the felt belts sucked. The extraction creates an air-liquid mixture, that again must be separated in order to a liquid flow to be able to measure and to ensure that do not get any liquid to the vacuum pump.

The air-liquid mixture occurs in the upper range z. B. tangentially in the Luftabscheidekammer 18 and the liquid is through the air flow along the spiral baffle 17 in the direction of the bottom plate of Luftabscheidekammer 18 guided. The resulting centrifugal forces and gravity separate the liquid from the air. The air then flows through the down to the lower part of the Luftabscheidekammer 18 reaching suction tube from the measuring container 1 ,

The liquid flows through an opening in the bottom plate of the air separation chamber 18 in the backwater chamber 15 ,

In the backwater chamber 15 The liquid accumulates and accumulates until it reaches the opening in the orifice plate 6 reached, through which the liquid from the back pressure chamber 15 in the drainage chamber 14 can flow.

The Orifice plate extends in the vertical direction, for example in the form of a rectangle that is taller than wide is. The orifice can also be different shape exhibit.

The overflow level results from the distance between Rückstaukammerboden and Unterkannte the Meßblendenöffnung 7 ,

Holds the fluid supply after reaching the level of the lower edge of the orifice 7 continues, the liquid begins over the orifice 7 from the backwater chamber 15 in the drainage chamber 14 to flow, wherein the liquid level continues to increase until the outflowing from the Meßblendenöffnung liquid stream corresponds to the liquid flow over the inlet 2 accrues.

At a balance between the incoming liquid volume flow and the out flowing liquid volume flow, the liquid level remains stationary at a height.

The measuring device 8th is with the backwater chamber 15 communicatively connected. This is the measuring chamber 13 once with the lower section of the backflow chamber 15 and once with the upper part of the backflow chamber 15 , which is above the maximum possible backwater, connected. This ensures that there is always the same pressure in the backflow chamber 15 and the measuring chamber prevails and so the liquid level is always identical, so the chambers communicate with each other.

The through the aperture 7 into the drainage chamber 14 Flowed liquid is then passed through the drain 3 aspirated. This prevents z. B. a pump that false air through the drain 3 gets into the measuring container.

In 2 is the measuring device 8th from 1 shown from another perspective, so that the measuring device 8th becomes more visible.

For measuring the height of the liquid level is the measuring chamber 13 with the backwater chamber 15 communicating so connected that in the measuring chamber 13 always the same level is available as in the back pressure chamber 15 , By separating the measuring chamber 13 from the backwater chamber 15 is achieved that the liquid surface for the measurement of the filling level is much quieter or calms down faster and so vibration is not as strong on the liquid surface in the measuring chamber 13 effect.

The filling level is in the measuring chamber 13 measured by a sensor without contact, preferably a microwave sensor whose transmitter emits pulses on the liquid surface which are reflected by the liquid surface and received by an antenna system again.

Parallel to the measuring chamber 13 In addition, a bypass sight glass may be attached.

The upper area of the backflow chamber 15 and the upper portion of the measuring chamber and the sight glass are connected to the negative pressure of Luftabscheidekammer / back pressure chamber.

To Cleaning purposes are maintenance openings to each chamber available.

In the 3 some aperture shapes are shown. Due to the different shapes, the flow rate can be influenced so that the change in the backwater level leads to clear measurement results. So it is possible to design the opening so that at critical backwater heights results in a clear backwater height change.

LIST OF REFERENCE NUMBERS

1

measuring Cup

2

Intake

3

procedure

4

partition wall

5

baffle

6

orifice

7

Measuring aperture

8th

measuring device

9

gauge

10

Bypass sight glass

11

connection

12

maintenance opening

13

measuring chamber

14

drain chamber

fifteen

back pressure chamber

16

Luftabscheidevorrichtung

17

Air baffle

18

air separation chamber

19

suction

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005048053 A1 [0012]

Claims (15)

Device for air separation and volume flow measurement of liquids, in particular for the measurement of dewatering quantities in paper machines, with a measuring container ( 1 ) for receiving a liquid whose volume flow is to be measured, wherein the measuring container ( 1 ) has at least three chambers, an air separation chamber ( 18 ) with a feed ( 2 ), a backflow chamber ( 15 ) and a drain chamber ( 14 ) with a sequence ( 3 ), which are interconnected; wherein the connection opening of the backflow chamber ( 15 ) to the drain chamber ( 14 ) from a metering orifice ( 6 ), which has a defined opening ( 7 ) is determined, which is chosen so that forms a defined backwater in the back pressure chamber; and a measuring device which measures the height of the backflow or the height of the liquid column, characterized in that the measuring device ( 8th ) from a measuring chamber ( 13 ) connected to the backflow chamber ( 15 ) is communicatively connected and consists of a sensor. Device according to claim 1, characterized in that in the measuring chamber ( 13 ) is provided a sensor for measuring the height of the liquid column. Device according to one of claims 1 or 2, characterized in that the sensor is a microwave sensor ( 9 ). Device according to one of claims 1, characterized in that the air separation device ( 16 ) from an air separation chamber ( 18 ) and a suction air connection ( 19 ), so that at the inlet ( 2 ) and thus also in the measuring container ( 1 ) A negative pressure can be generated. Device according to claim 4, characterized in that the inlet ( 2 ) substantially from above into the backflow chamber ( 15 ) or in the upper region of the air separation chamber ( 18 ) he follows. Device according to claim 4, characterized in that the inlet ( 2 ) tangentially into the air separation chamber ( 18 ) he follows. Apparatus according to claim 4, characterized in that the Luftabscheidekammer ( 18 ) is cylindrical and on the cylinder wall an air baffle ( 17 ). Apparatus according to claim 7, characterized in that the air baffle ( 17 ) spirally from the inlet ( 2 ) goes down. Device according to claim 1, characterized in that the measuring diaphragm ( 6 ) is interchangeable. Device according to one of claims 1 or 9, characterized in that the measuring diaphragm ( 6 ) an adjustable measuring opening ( 7 ) having. Device according to one of claims 1, 9 or 10, characterized in that the measuring aperture ( 7 ) is designed so that the running volume flow changes with antiproportional changing with backwater height. Device according to claim 1, characterized in that the process ( 3 ) in the drain chamber ( 14 ) is mounted below the aperture, preferably in the bottom region of the drain chamber. Device according to claim 1, characterized in that the measuring chamber ( 13 ) outside the backflow chamber ( 15 ) is positioned. Device according to claim 1, characterized in that the measuring chamber ( 13 ) within the backflow chamber ( 15 ) is positioned. Apparatus according to claim 1, characterized in that parallel to the measuring chamber ( 13 ) a bypass sight glass ( 10 ) and communicating with the measuring chamber ( 13 ) connected is.

Images