FI110701B - Apparatus for connecting the dilution flow to the stock flow derived from the manifolds of the paper machine / board machine - Google Patents

Description

110701

Apparatus for connecting the dilution flow to the stock flow derived from the manifolds of the paper machine / board machine

Anläggning for att förena en utspädningsström med massaströmmen som letts frän fordelningsbommen i en pappersmaskin / cardboard mask 5

The invention relates to an apparatus for combining a dilution flow with a pulp stream from a junction of a paper machine / board machine.

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From the applicant's previous patent applications FI901593, FI 933027 and FI 942780 there are known so-called. a dilution headbox, which means a headbox structure in which the basis weight of the web is adjustable by introducing a dilution flow through the valves at different widths of the headbox and adjusting the amount of such flow. The dilution flow is mixed with the mass flow from the manifold head manifolds 15. The dilution flow may be a pure or fibrous liquid. The dilution water may thus be, for example, tap water taken from the web as retention.

From the patent application FI 942780 there is known a so-called. a sleeve arrangement wherein the diluent 20 is introduced into a sleeve at the front end of the turbulence generator and flows toward the end of the sleeve at the annular channel between the sleeve and the space where the sleeve is placed, where the flow is mixed with the mass flow from the sleeve. The combined * * »flow is further passed through the throttle in the turbulence generator and • · * · 'forward to the lip cone and forming wire. EN 942780 solution dilution flow '. . · 25 is thus introduced into one of the tubes of the turbulence generator at each respective point of the tube: ''. However, it has proven advantageous to split the dilution flow into more than one overlapping mass flow tube.

t • In this application, this problem has been inventively solved by creating a completely: 30 new type of sleeve structure. The sleeve opens to a mass flow distribution space wider than its inlet end, e.g., in the intermediate chamber and in the middle of the sleeve has an annular groove, whereby several holes are made in the groove area through the sleeve wall. Similarly for career. ': a partition of a turbulence generator or similar manifold, such as a bellows, has been • drilled through. Dilution water flows from the annular space not only inside the sleeve and is thereby combined with the mass flow, but also through said through-hole bore into the second channel below and the annular space of the sleeve therein. In the solution according to the invention, the dilution water flow is first led to the first sleeve 2110701 above its annular space and further through the annular space of said sleeve through the wall bore to the second sleeve and possibly to the third sleeve by an arrangement similar to the second sleeve.

It should be noted that the structure of the invention can be placed in the dilution water either in a turbulence generator or directly in connection with a manifold on the inlet side of the duct pipes with the sleeve (s) arranged to open in the manifold. Thus, the structure of the invention is not intended to limit the invention to a particular location of the sleeve structure.

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The structure of the invention may also be such that at each sleeve, the dilution flow is led to the mass flow from the headbox, not only through the core sleeve boreholes of the sleeve, but also by allowing a portion of the dilution water stream to pass through the sleeve. in the annular space 15 between the wall of the mixing chamber, whereby the dilution fluid is mixed with the mass flow from the sleeve at the end of the sleeve, whereupon, after throttling, the combined flow is introduced into either the turbulence generator tubes or downstream piping tubes. The direction in which the dilution flow and the mass flow meet each other can be selected by drilling the slit holes either perpendicular to the central axis of the slit or obliquely with respect to said central axis. Thus, the dilution flow can be led to the mass flow in the desired direction. For example, the dilution flow can be derived against the mass flow, whereby the mass flow and the dilution flow collide obliquely.

; The invention is characterized by what is stated in the claims.

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The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, but which are not intended to be limited thereto.

Fig. 1A shows a structure according to the invention fitted in the headbox of a paper machine / board machine at the front end of a post-intermediate turbulence generator.

': · 1 · An example of a headbox type is shown.

Figure IB is a top plan view of the structure of Figure IA; »2 2 for importing dilution liquid.

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Fig. 2 is a cross-sectional view of a sleeve structure in a vertical row A.

Figure 3 illustrates an embodiment of the invention in which the dilution flow is conducted in connection with the mass flow not only through bores passing through the wall of the sleeve but also at the end of the sleeve.

Figure 4 shows an embodiment of a sleeve structure according to the invention in which the collision angle of the dilution flow and the mass flow is selected by selecting the direction of the wall bore of the sleeve. In the embodiment of Figure 4, the wall bore is inclined 10 at an angle to the central axis of the sleeve. The currents L1 and L2 thus collide with each other and the mixing of the currents is efficient.

Figure 5A shows the positioning of the sleeve of the invention at the front end of the pulley in connection with the pulp log of the headbox of a paper machine / board machine.

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Figure 5B is a top plan view of the structure of Figure 5A at the point where the diluent is introduced.

As shown in Fig. 1A, the headbox 10 of the paper machine / board machine comprises a manifold J, 20 a manifold 11 after the manifold J, and then an intermediate chamber 12 which opens up to an equalization; · In chamber 13. After the intermediate chamber 12 there is a turbulence generator G in which the invention. '. The sleeve 15 used for dispensing the diluent according to FIG. Turbulence Generator ··. the tubes Gu, Gi.2 ... of the market G further open into the lip cone 16, which, as shown in the figure, comprises lamellae 17a, 17a2, 17a3. The mass is further led from the lip cone 16 through the outflow gap 25 to the forming wire H. As shown in the figure, the outflow gap after the lip cone 16 comprises a tip strip n and its adjusting mechanism 18. The positioning n can be adjusted by adjusting spindles 19 The diluent Li may be pure water or tap water or any other fiber-containing liquid preferably in a concentration different from that of the mass flow rate 1 "(30). The dilution fluid flow Li is controlled by the valves Vi, V2 ... the width of the headbox so that the desired dilution flow at different widths of the headbox can be brought in and adjusted at each width position by adjusting the dilution flow valve V1, V2 .... 1 1 ': 35 Fig. 1B shows a plan view of Fig. 1A.

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Figure 2 illustrates the dilution water import flow associated with Figure IA, IB. The dilution water is led (arrow Li) along the dilution water line Di, as shown in Figure 1, to the pipeline of the turbulence generator G at its forward end. The dilution water is introduced (arrow Li) into the mixing chamber 21, which further opens into the tube 5 Gi.i of the turbulence generator G. The mixing chamber is provided with a sleeve 15 centrally positioned, the sleeve 15 having a central flow passage 15a and a sleeve 15 in the center of the annular groove 15b and bores 15ci, 15c2 ... or the like passing through the sleeve wall structure. The mass flow L2 from the headbox manifold J is led from the intermediate chamber E into the sleeve 15, whereby the mass flow L2 encounters the dilution flow L1 through the bores 15ci, 15c2 ... from the annular groove 15b. The combined flow L1 + L2 continues to flow inside the sleeve 15 in the flow passage 15ai towards the front end of the turbulence generator G via separate flow resistors 22ai, 22a2 .... As shown in Fig. 2, the flow resistor 22ai is formed by a condensation. The sleeve 15 further comprises an end shoulder 15d facing the end shoulder 23 of the mixing chamber. After the shoulder 15d, the sleeve 15 comprises threads 15e, of which the sleeve 15 is rotatable at the end of the mixing chamber 15 into its counter-threads 24. The sleeve 15 and the mixing chamber 21 have a circular cross section.

As shown in Fig. 2, there is a flow orifice 14 in the piping wall F at the annular groove 15b of the sleeve 15ai, from which the dilution flow is led to the second mixing chamber 21 'below into the annular space 15b' of the sleeve 15 '. 15 'of the ring space of said sleeve; further, the dilution flow can be conducted in a similar arrangement to the next underside sleeve 15 ", and so in the structure, one dilution fluid connection Di can be conducted to the vertical dipstick A, preferably to all of its tubes.

As shown in Fig. 2, the sleeve 15 further comprises at its end a conical extension M, from which the combined flow L1 + L2 is further passed to the mixing chamber 21 and further to the tube of the turbulence generator G and further to the turbulence generator.

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Figure 3 illustrates an embodiment of the invention which otherwise corresponds to the embodiment of Figure 2, but in which the flow is conducted except for the bores, ·,; 15ci, 15c2 ... through the sleeve 15 into the channel 15a, also so that a portion of the dilution flow Li 'passes between the outer surface Ci of the sleeve wall structure and the wall structure C2 of the mixing chamber 21 to the end of the sleeve where it meets the throttle Ni. whereupon said dilution flow Li 'is led to the end of the mixing chamber 21 where it further encounters the flow Li + L2 from inside the sleeve 15. Thus, the dilution flow Li is combined with the mass flow in two ways. In the first step (downstream 5 110701) in the center region of the sleeve and in the final stage outflow from the annular space at the end of the sleeve 15 in the end area of the mixing chamber 21 before ducting.

Figure 4 illustrates an embodiment of the invention in which the junction angle of streams L1 and L2 is selected by selecting the direction of bores 15ai, 15a2 ... or openings in the sleeve relative to the center axis (X axis) of the sleeve 15 for dilution flow. Thus, in the embodiment of Figure 4, the flows L1 and L2 meet so that the dilution flow L2 collides with the flow L1. Thus, the dilution flow L1 is controlled against the flow L2. The collision intensifies the mixing of the flows L1 and L2.

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Fig. 5A shows a sleeve structure according to the invention disposed at the front end of a bellows 11 in connection with a manifold J.

Figure 5B is a top plan view of the device structure of Figure 5A. The structure of Figures 5A and 5B is exactly similar to that of the dilution fluid introduced and controlled as described above except that the sleeve structure of the invention is now fitted not to the turbulence generator G but to the bellows 11 after the manifold J.

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Claims (5)

110701 Apparatus for combining a dilution flow (Li) with a pulp flow (L2) derived from a paper machine / board dispenser support (J), the apparatus comprising a dilution flow passage (Di) through which a dilution flow is conducted in in such a way that the dilution flow is led to a mixing chamber (21), which mixing chamber comprises a sleeve (15) which opens at one end into a common mass distribution space (E, J), characterized in that the apparatus comprises at least one second mixing chamber (21 ') 10 an associated turbulence generator or duct tube (G1.2), the mixing chamber (2Γ) comprising a sleeve (15 ') connected thereto, wherein a flow path (14) is formed between the overlapping sleeves, whereby the dilution flow (Li) (15 ') and thus the dilution flow rate (Li) can be brought to one from the flow passage (Di) to the entire vertical row (Ai), that is to say, several overlapping tubes of the turbulence generator (G) or the bellows (11). Apparatus according to the preceding claim, characterized in that bores (15ci, 15c2 ...) are introduced through the wall structure of the sleeve (15), preferably in the middle region of the sleeve. An apparatus according to the preceding claim, characterized in that the sleeve *; > j (15) comprises an annular groove (15b) extending in its central region around the sleeve, in which ·; the diluent (Li) is first introduced and the annular groove (15b) comprises a passageway (15) passing through said bores, openings (15ci, 15c2 ...) or the like. »* * -» * ¥ m Apparatus according to any one of the preceding claims, characterized in that; ; the sleeve (15) comprises bores (15ci, 15c2 ...) through its wall and is thus * fitted into the mixing chamber (21) so as to leave a flow path between its outer surface (Ci) and the wall (C2) of the mixing chamber (21), the dilution flow is mixed with the mass flow, not only inside the sleeve (15) but also in the 30 parts of the mixing chamber (21) at its end after the end of the sleeve (15). <»',, J Apparatus according to one of the preceding claims, characterized in that. boreholes, openings (15ci, 15c2 ...) of the sleeve or the like are made obliquely with respect to the central axis of the sleeve (X-axis), whereby the dilution flow rate (Li) can be aligned with the mass flow rate (L2): 35 at an oblique angle. 7 110701