WO2016026631A1 - Steam blower box - Google Patents

Steam blower box Download PDF

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Publication number
WO2016026631A1
WO2016026631A1 PCT/EP2015/066413 EP2015066413W WO2016026631A1 WO 2016026631 A1 WO2016026631 A1 WO 2016026631A1 EP 2015066413 W EP2015066413 W EP 2015066413W WO 2016026631 A1 WO2016026631 A1 WO 2016026631A1
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WO
Grant status
Application
Patent type
Prior art keywords
steam
pressure chamber
characterized
blower box
box according
Prior art date
Application number
PCT/EP2015/066413
Other languages
German (de)
French (fr)
Inventor
Frank Wegehaupt
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00Other details of machines for making continuous webs of paper
    • D21F7/008Steam showers
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00Calenders; Smoothing apparatus
    • D21G1/0073Accessories for calenders
    • D21G1/0093Web conditioning devices
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00Damping devices

Abstract

The invention relates to a steam blower box for applying a paper, paperboard, tissue or other fibrous material web (1) in a machine for the production and/or refinement thereof with steam, wherein at least one steam-filled pressure chamber (2) of the steam blower box is connected to one or more nozzles directed at the fibrous material web (1). For this purpose, in order to achieve a simple zonal control of the steaming, the outlet openings (3) of the nozzles of the pressure chamber (2) form an outlet surface (6) of the pressure chamber (1), and at least one section of the outlet surface (6) is assigned a controllable cover (5) for changing the effective nozzle cross-sectional area in this section.

Description

steam blow

The invention relates to a steam blower box for applying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with steam, wherein at least one filled with pressurized steam space of the steam with one or more directed towards the fibrous web nozzles communicates. Such steam boxes are used particularly in the press section or at Glättanordnungen of paper machines.

A treatment of the fibrous web with the hot steam the web temperature is increased and the viscosity of the water lowered in this.

This often occurs in several separately controllable zones transverse to the direction of web travel. For this purpose, the steam blower box has a plurality of transversely to the web running direction, arranged side by side chambers with a width between 40 and 400 mm, which are each connected via a control valve with a common Dampfeinspeisekammer.

Each of these chambers has its own nozzles that direct the steam to the fibrous web. Because of the different steam pressures in the chambers and the exit velocity of the vapor, which may adversely affect the efficiency of the steam is different.

A separate steam supply of the chambers would substantially increase the effort.

The object of the invention is therefore to improve the lowest possible cost efficiency of steam. According to the invention the task is solved in that the outlet openings of the nozzle of the pressure chamber forming an exit face of the pressure space and efficient, that is associated with the vapor flow-through nozzle cross-sectional area in this section, at least a portion of the exit surface a controllable cover for changing the.

In this way, the amount of steam that flows from the respective portion of the exit surface of the fibrous web can easily change and thus adapted to the requirements of the fibrous web or the process,

If a larger amount of steam to act on the fibrous web, the cover is a greater nozzle cross-sectional area free, and vice versa.

This eliminates the need of chambers, which significantly reduces the effort.

The exit speed with which hot steam leaves the nozzle, thus depends on the pressure in the pressure chamber and the open, that is shared by the covers nozzle cross-sectional area of ​​the nozzle from. Accordingly, the exit velocity is the same for all nozzles of an exit surface.

This in turn enables an exact metering of the amount of steam, which is to act on the individual sections of an exit surface of the fibrous web. As a result, this saves energy.

Depending on the nature and extent of the applied amount of steam also different nozzle shapes can be used.

The application of much steam with a compact beam is possible when the pressure space is in communication with only one, preferably slot-shaped nozzle meadow. In this case, the slot should extend transversely to the web running direction. About the covers while the slit width can be varied in the respective sections. For example, if a smaller amount of steam sprayed onto the fibrous web and / or the exit surface of the steam to be widened in the web running direction, however, it may be advantageous if the pressure chamber is in communication with a plurality of nozzles.

If the cross-sectional areas of the nozzle of the pressure chamber have the same shape and preferably also the same size, this can simplify the manufacture of the exit surface.

In contrast, an adaptation to the specific requirements in the respective sections is possible via different cross-sectional areas of the nozzles of the print space.

Depending on the shape and size of the nozzle openings, it may be advantageous if the corresponding cover of a closed surface is formed, or has at least one passage opening.

In both cases, a partial or complete closing of the nozzle openings is possible.

In order to enable control of the amount of steam in as many zones transverse to the web running direction, several be associated transversely to the web running direction adjacent or spaced-apart portions of the exit surface of the pressure chamber in each case one controllable cover should.

To simplify the construction, the cover should be located in front of the entry side of the nozzles. Thus contamination is vorgebeut.

For the purpose of changing the pressure in the pressure chamber, and thus the exit velocity of the vapor from the nozzles supplied to the pressure chamber should be adjustable amount of steam via a control valve. If the exit velocity that is too small, so the steam can not or not fully penetrate the air boundary layer of the fast moving fibrous web. At least part of the steam is then carried away and lost that way. Too high exit velocity may cause a reflection of the vapor on the fiber web surface before it can condense. Also, damage to the fiber structure is possible.

Therefore, it is advantageous if the pressure in the pressure chamber is controlled by the control valve in such a way that depending on the open nozzle cross-sectional area of ​​the exit surface of the pressure chamber, the exit velocity of the vapor is in a specified range, and preferably constant.

Especially with small machines it can suffice often when the steam box has only a pressure chamber.

To better adapt to the conditions of the engine however, it may also be advantageous if the steam blower box has a plurality of pressure chambers, one or more have at least one cover of those.

This makes it possible to build, for example, in the pressure chambers, different pressures, which is also different exit speeds.

The invention will be explained in more detail in several exemplary embodiments.

In the accompanying drawings:

1 shows a cross section of a steam blower;

2 shows a detail of the exit surface 6 of Figure 1 and

3 shows a cross section of another steam blower and

4 shows a detail of the exit surface 6 of Figure 3 and

Figure 5 is a steam blower box with a plurality of pressure chambers 2 and

Figure 6 is an exit area 6 having only one nozzle. The steam boxes shown here serve for acting upon a passing pulp web 1, in particular a paper web with hot water vapor.

The vapor condenses on the surface of the fibrous web 1 and so increases its temperature and humidity. About the transverse profile of the fibrous web properties, such as to be able to influence the moisture profile specifically and efficiently, the intensity of the vapor impingement in zones or sections transversely to the web running direction 8 can be controlled separately.

The steam blower box shown in Figures 1 to 4 is formed essentially of only a pressure chamber 2, in which steam is bar overpressure at a pressure between 0.1 and 1; 5. In the side facing the fibrous web 1 side wall of the pressure chamber 2 there are a plurality of evenly over an exit surface 6 arranged distributed nozzles. From the outlet openings 3 of the nozzles of the vapor flows at a rate between 10 and 150 m / s, preferably between 30 and 80 m / s. In this way it is ensured that the steam can overcome the entrained from the fibrous web 1 air boundary layer.

In a particularly inexpensive embodiment, the exit surface is formed by a metal sheet of the side wall of the steam blower box in Figures 1 and 2 6 such that the nozzles with their outlet openings 3 can be provided via through-holes in the metal plate easy.

In order to control the reaching to the fibrous web 1 steam amount independently in a plurality of transversely to the web running direction 8 adjacent sections associated with these sections each have a controllable cover. 5 To protect against contamination and in the interest of a simple construction are the covers 5 in front of the inlet openings of the nozzles, that is, before the side facing the pressure space 2 side wall of the steam blower.

The displacement of the cover 5 occurs in all versions via electrical, hydraulic or pneumatic actuators 4 in the web running direction. 8

About the partial or full coverage of nozzles of the respective section the open, flow-through from the steam nozzle cross-sectional area can thus be changed.

In Figures 1 and 2, the covers 5 are formed from a closed surface.

In contrast, the exit surface 6 has only a slit-shaped nozzle, the slit-shaped outlet opening 3 extends transversely to the web running direction 8 at least approximately over the entire pressure chamber 2 in FIG. 6 Again, the slot width and thus the amount of vapor of the respective section of the exit surface 6 can be changed through the displacement of the transversely juxtaposed to the web travel direction covers 8. 5 In the embodiment according to Figures 3 and 4, the covers have 5

Passage openings 7, which coincide with the inlet openings of the nozzles. If the through-holes 7 aligned over the inlet openings of the nozzles, so a maximum amount of steam flows in through the nozzles. A displacement of the

Covers 5 reduces the open area of ​​the inlet openings of the nozzles and thus also the amount of steam passing through the nozzles in the relevant section.

Here, the exit surface 6 of the steam box comprises two parallel, spaced apart and extending transversely to the web running direction 8 strips. The nozzles are located transversely to the web running direction 8 alternately in different strips, and are formed in each section of the exit surface 6 of four parallel, spaced apart and transversely to the web running direction 8 extending slots.

Accordingly, each cover 5 has four parallel, spaced apart and extending transversely to the web running direction 8, slot-shaped passage openings. 7

Since the nozzles of each section are connected to the same pressure chamber 2, and the exit velocity of the vapor from the nozzles over these sections is the same. To adapt the exit velocity to the requirements should therefore be seen in Figure 5, the pressure chamber 2 amount of steam supplied via a control valve 9 be adjustable.

Via the control valve 9, the pressure in the pressure chamber 2 can be controlled so that, depending on the open nozzle cross-sectional area of ​​the exit surface 6 of the pressure chamber 2, the exit velocity of the vapor is in a specified range, and preferably constant.

The steam blower box in Figure 5 has in addition to the pressure chamber 2 with the covers 5, respectively in the edge area of ​​the fibrous web 1 is still a further narrow pressure chamber 2 without cover 5 without the cover 5, the steam supply being controlled through control valves 9 Even when the pressure chambers. 2

In the edge region of the fibrous web 1 other requirements are often given to the profiling, so a larger or smaller pressure may be required here in comparison to the intermediate pressure space. 2

Claims

Claims. 1 Steam blower box for applying a paper, board, tissue or another fibrous web (1) in a machine for producing and / or finishing the same with steam, wherein at least one filled with pressurized steam chamber (2) of the steam with one or more to the fibrous web (1) directed nozzles is in communication, characterized in that the outlet openings (3) of the nozzle of the pressure chamber (2) form an outlet face (6) of the pressure chamber (2) and at least a portion of the exit surface (6) a controllable cover (5 ) is assigned to change the effective nozzle cross-sectional area in this section.
2. Steam blower box according to claim 1, characterized, in that the
Pressure chamber (2) with only one nozzle is in connection, which is preferably formed slit-shaped.
3. Steam blower box according to claim 1, characterized in that the pressure chamber (2) communicates with a plurality of nozzles.
4. Steam blower box according to claim 3, characterized in that
Cross-sectional areas of the nozzle of the pressure chamber (2) have the same shape.
5. Steam blower box according to claim 3, characterized in that
Cross-sectional areas of the nozzle of the pressure chamber (2) have different shapes.
6. Steam blower box according to one of the preceding claims, characterized in that the cover (5) is formed from a closed surface.
7. Steam blower box according to one of claims 1 to 5, characterized in that the cover (5) has at least one passage opening (7).
8. Steam blower box according to one of the preceding claims, characterized in that a plurality of transversely to the web running direction (8) adjacent or spaced-apart portions of the exit surface (6) of the pressure chamber (2) is assigned a controllable cover (5).
9. Steam blower box according to one of the preceding claims, characterized in that the cover (5) is in front of the entry side of the nozzles.
10. Steam blower box according to one of the preceding claims, characterized in that the pressure chamber (2) is adjustable amount of steam supplied via a control valve (9).
1 1 .Dampfblaskasten according to claim 10, characterized in that the pressure in the pressure chamber (2) via the control valve (9) is controlled so that depending on the open nozzle cross-sectional area of ​​the exit surface (6) of the pressure chamber (2) the exit velocity of the vapor remains in a predetermined range and preferably constant.
12. Steam blower box according to one of the preceding claims, characterized in that it comprises only one pressure chamber (2).
13. Steam blower box according to one of claims 1 to 1 1, characterized in that said plurality of pressure chambers (2), of which have one or more of at least one cover (5).
PCT/EP2015/066413 2014-08-19 2015-07-17 Steam blower box WO2016026631A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102014216412.5 2014-08-19
DE102014216412 2014-08-19

Publications (1)

Publication Number Publication Date
WO2016026631A1 true true WO2016026631A1 (en) 2016-02-25

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ID=53887072

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/066413 WO2016026631A1 (en) 2014-08-19 2015-07-17 Steam blower box

Country Status (1)

Country Link
WO (1) WO2016026631A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268976A (en) * 1978-07-14 1981-05-26 Dove Norman F Steam distribution apparatus
US20040261965A1 (en) * 2003-06-25 2004-12-30 Burma Gary K. Cross-direction actuator and control system with adaptive footprint
EP1722031A1 (en) * 2005-05-13 2006-11-15 Voith Patent GmbH Method and apparatus for humidifying a web material
DE102005031444A1 (en) * 2005-07-04 2007-01-11 Voith Patent Gmbh Apparatus for wetting sheet of material, e.g. paper, has nozzle arrangement supplied with controllable amounts of water, steam and air, allowing variation of wetting effects
EP2792787A1 (en) * 2013-04-17 2014-10-22 Honeywell Asca, Inc. Method and apparatus for distributing steam

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268976A (en) * 1978-07-14 1981-05-26 Dove Norman F Steam distribution apparatus
US20040261965A1 (en) * 2003-06-25 2004-12-30 Burma Gary K. Cross-direction actuator and control system with adaptive footprint
EP1722031A1 (en) * 2005-05-13 2006-11-15 Voith Patent GmbH Method and apparatus for humidifying a web material
DE102005031444A1 (en) * 2005-07-04 2007-01-11 Voith Patent Gmbh Apparatus for wetting sheet of material, e.g. paper, has nozzle arrangement supplied with controllable amounts of water, steam and air, allowing variation of wetting effects
EP2792787A1 (en) * 2013-04-17 2014-10-22 Honeywell Asca, Inc. Method and apparatus for distributing steam

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