DE10002982A1 - Assembly to filter and degas water flows in an equalized pressure system has an external intermediate store at the inflow side into the vessel which has a filter layer and a vacuum environment - Google Patents

Abstract

For the filtration under vacuum of flow systems, with equalized pressure, a vacuum chamber (6) has a filter layer (7). The water flow is held in an external intermediate membrane store (14) at the inflow side of the closed vessel. The water to be treated is drawn by a suction pump (1) through the filter layer. A throttle sets the flow manually or automatically, to generate the vacuum. At the filter layer, all the gas and vapor bubbles which cannot pass through the filter permeability are held and gathered. At the end of the vacuum time, the pressure equalizing is restored to the operating pressure, and any gas is ejected by the overpressure through the exhaust (15). The disrupted solution equilibrium for the gases through the pressure drop, and also single and lightly-grouped water molecules, is further disrupted to give a stronger spontaneous gas ejection by physical forces acting on the filter layer e.g. mechanical oscillations or electrostatic pulses, or special filter layer characteristics by electrochemical and/or catalyst and/or tribochemical effects.

Description

State of the art

The degassing of water according to DE 197 04 298.8 is known as an extremely effective method. The disadvantage is that lack of possibility for simultaneous or final Filtration of the medium during or after completion of the vacuum pro zesses. In the absence of a filter matrix, steam and gas bubbles and other solids are not separated and, secondly, because of a suitable fil termatrix the other outgassing behavior can be changed. When treating water in hermetic circles, such as. B. Heaters or closed cooling water systems, or at the boiler preservation, it would be a great advantage if At the same time as the degassing, the water is also clearly filtered would and that of the water that was in during the vacuum period an intermediate storage is transported when passing through through the filter matrix, the gas and vapor bubbles, so to speak filters "so that they can climb into the exhaust area nen.

solution

The object is achieved by the apparatus according to the invention solved that in the chamber in which the vacuum is generated Filter medium is introduced, through which the water must flow, before it comes out again.

At the same time, it can be placed above or above the filter medium one or more sieves or filter mats etc. positio to the vapor and gas bubbles above the filter to separate the layer.

description

Fig. 1a, 1b and 1c show a possible embodiment of such a filtration degassing apparatus. Fig. 1a shows the apparatus in the state "circulate water and filter", and Fig. 1b shows the apparatus in the state "pull vacuum, degas".

Fig. 1c shows a detail in the water area: transition into the filter layer and shows how the filter layer separates steam and gas bubbles from the water flowing down through the layer.

Representation Fig. 1a

A suitable for generating both positive and negative pressure pump or pump apparatus 1 takes a circuit 2 via the connection point 3 and Ven valve 4 water and presses this, flowing valve 5 , into the container 6 and further through the filter layer 7 , at the end the water collects in a nozzle 8 at the bottom, the tube 9 rises, the flow switch 10 and the check valve 11 flows through and at the connection point 12 clearly filtered flows back into the circuit 2 .

In the control box 13 there is a timer on which the length of the circulation time is set. At the beginning of the circulation period, the water previously stored in the membrane storage 14 could flow back into the container 7 and press the accumulated gases via the exhaust 15 and the check valve 16 to the atmosphere. The thick lines show the respective flow path of the water during the function shown in this and the following figures. The thin lines show the inactive strand.

Representation Fig. 1b

After the circulation time = filtration time = exchange time for the previously degassed water, the apparatus switches to the "pull vacuum" function. Now the pump 1 sucks the water through the filter layer 7 , the bottom nozzle 8 , the tube 9 , the flow switch 10 , the valve 17 and presses it through the valve 18 through the connection point 12 into the circuit 2 and further into the membrane accumulator 14 . Note: the membrane accumulator 14 is not part of this apparatus according to the invention, but must be present in every hermetic water system so that volume fluctuations can be absorbed. The storage bladder can be provided with a specific gas cushion or, at the highest point of the system, can be equipped with a flexible membrane that is open to the atmosphere.

After completion of the cycle shown in Fig. 1b, the cycle "circulation, filtration" starts as shown in Fig. 1a. The container 6 is again filled with water from the circuit 2 , and the pressure rises from vacuum to operating pressure, with all vapor bubbles spontaneously condensing. The gases accumulated on the container ceiling are pushed into the exhaust chamber 15 by the rising water and further by the check valve 16 to the free atmosphere. The gas is therefore emitted with overpressure and not only at normal pressure.

FIGS. 2a, 2b and 2c show a second embodiment of such a filtration degassing apparatus, in which the water drag even when vacuum is continuously sucked through the filter layer and the vacuum is interrupted only briefly for the purpose of Gasaustoßes. The possible installation of a sieve is also shown, both for separating the bubbles and for mechanically strengthening the gas expulsion in a vacuum.

Fig. 2a shows the apparatus in the state "circulate water, pull vacuum and filter."

Fig. 2b shows the apparatus in the state "return to operating pressure and gas emission".

Fig. 2c shows a detailed section in the water area: transition into the filter layer and shows how the vibrating screen 24 placed above the filter layer promotes the formation of bubbles 19 and their separation and how the bubble-free water flows through the filter layer 7 down to the collecting nozzle.

Instead of the mechanical vibrating screen 24 , other power sources for the forced expulsion of the steam and gas bubbles can be used, such as. B. those that work with high frequency vibrations and / or take advantage of electrochemical or catalytic effects.

Representation Fig. 2a

A pump 21 with a very strong suction power or the combination of a powerful pump + jet pump sucks water from the circuit 2 via the section 22 , automatic valve 23 , collecting nozzle 8 , filter layer 7 , vibrating screen 24 , section 25 , orifice 26 and connection point 27 . The orifice 26 reduces the volume flow on the suction side of the pump 21 so much that there is a strong negative pressure, as a result of which the pressure drops in the container 6 and the gases can escape from the liquid because the solubility equilibrium is undershot. In order to accelerate the gas release and to allow the desired vapor bubble formation (trailing steam to gas expel) to take place at the earliest possible time, there is a vibrating screen 24 above the filter layer 7 , which is connected to the vibrating drive 29 via the rod 28 .

The water sucked in by the pump 21 is conveyed back into the circuit 2 via the flow monitor 10 and the connection point 30 . Valve 32 is closed. The membrane expansion vessel 14 buffers pressure and volume fluctuations and provides the volume replacement for expelled gases. The pressure gauge 20 shows the respective pressure.

Representation Fig. 2b

Valve 23 is closed and has shut off route 22 . Valve 32 has opened and has opened the path 31 for the forced circulation of the circulatory system 2 from connection point 33 via the pump 21 , flow monitor 10 and connection point 30 . The check valve 34 prevents backflow from connection point 30 to connection point 33 , so that a circulation takes place in the system 2 even when the circulation pump (not shown) is switched off there. The pump 21 now has no effect on the degassing and filtration apparatus, so that water can flow into the vessel 6 via the connection point 27 , the orifice 26 , the section 25 and there the pressure builds up again to the level of the system pressure. All steam bubbles condense, and the expelled gases are pressed out of the puff collector 15 and the check valve 16 to the free atmosphere.

Achievable advantages

With the apparatuses according to the invention, hermetic currents systems such. B. heating or cooling circuits on machines and engines not only effectively degassed, but also at the same time can be clearly filtered with any fineness. The latter is an essential requirement for any effective water treatment development, whose goal is to stop corrosion processes and Remove sludge during operation without the circle running water must be replaced. Through the continuous Return fully degassed water to the circulatory system stem can gas depots, such as z. B. often in underfloor heating can be found and there z. B. a not yet curable Evil are to be completely removed, leaving such circuits become hydraulically controllable again. The same applies z. B. for Cooling circuits in complicated manufacturing tools, e.g. B. in the Manufacture of technical plastic parts.  

Applications

Commissioning and renovation of heating systems, cooling water and Climate cycles. Degassing of feed water in steam generators, especially rapid steam generators, for preservation of downtimes of steam boilers. Degassing of fire protection pipe systems (Sprinkler systems) and other applications.  

List of reference numerals used in Figures 1a-c and 2a-c

1

c (detail) =

Fig.

1c

1

pump

2

Circulatory system

3rd

Suction connection point

4

aut. valve

5

aut. valve

6

Filter and vacuum containers

7

Filter layer

8th

Collecting nozzle

9

Riser pipe

10th

Flow switch

11

check valve

12th

Return point of return

13

control

14

Membrane accumulator

15

Exhaust collector

16

check valve

17th

aut. valve

18th

aut. valve

19th

Steam and gas bubbles

2

c (detail) =

Fig.

2c

20th

manometer

21

Suction pump

22

route

23

aut. valve

24th

scree

25th

route

26

cover

27

Vacuum the connection point

28

pole

29

Vibratory drive

30th

Return point of return

31

route

32

aut. valve

33

Conn. Point idle circulation

Claims (5)

1. A method of filtering water when flowing through a vacuum chamber equipped with a filter layer, characterized in that the water which has flowed through is temporarily stored in an external compensation tank when the vessel is closed on the inlet side. 2. The method according to claim 1, characterized in that the water flowing through by means of a suction pump the filter layer is transported, for manufacturing of the vacuum on the inlet side one manually or automatically adjustable throttle that changes the flow rate is. 3. Process according to claims 1 and 2, characterized in that all gas and vapor bubbles larger using a filter layer than the permeability of the layer this doesn't happen can and collect about it.   4. The method according to claims 1, 2, 3, characterized in that after the end of the vacuum time the pressure equalization at Operating pressure is restored, in a row whose the expelled gases with overpressure over the off puff be expelled. 5. The method according to claims 1, 2 and 3, characterized in that by means of special acting on the filter layer physical forces, such as mechanical vibrations or elec trostatic impulses or special layer properties by means of electrochemical and / or catalytic and / or tribochemical effects already through the pressure drop disturbed solution balance for gases (and also for simp and small grouped water molecules) even further can be disturbed so that the gas and steam spon tan is reinforced.