FI95404C - Steam box in paper / board machine - Google Patents

Description

5 95404 Steam box in paper / board machine Angläda i pappers / board board

The invention relates to a steam box in a paper / board machine.

A steam box used in connection with a Sym-Press II type press is known from the prior art, through which hot steam is introduced into the paper web to reduce the viscosity of the water in the dough and thus to promote the drainage of water from the web. The steam box according to the prior art is the so-called single hull. It comprises, in connection with it, a steam supply pipe, valves and a steam distribution section. Steam distribution pipe must be of sufficient diameter one, so that the pressure in the inlet conduit does not change too much between the drive side and the service side. The volume of the blocks in the control zone should also be large, as this facilitates an even distribution of steam across the width of the control block. The structure has thus become relatively bulky and has been difficult to place between the rollers. As the structure has become space-consuming, its opening movement from the operating position to the washing position has remained small. There will be a lot of welds in the current steam box structure. However, the exact shape of the steam distribution surface is required. The large number of welds, on the other hand, leads to welding distortions and thus the above-mentioned correctness of the steam distribution surface is compromised. The distribution of steam in the current structure is performed by means of control valves. Control valves are very difficult to maintain due to space constraints.

According to the invention, it is proposed in the present application to form a steam box with a distribution body comprising a first body part, i.e. a blowing part, through which steam is fed to a paper web and a second body part, i.e. a distribution body, to which steam is first introduced before and through the first body part. in connection with the pulp web to reduce the viscosity of the water in the pulp and thereby promote the drainage of water from the web. The second body part is the so-called a manifold to which control valves can be fitted and through which steam is conducted to the first body part, i.e. the steam blowing part. Between the first and second body parts are 2 95404 flexible hoses. Thus, the first body part can be fitted very far from the actual distribution point of the steam mass path. The steam blowing section does not require as much space as the old structure where the control valves are located in connection with the blowing section. By using flexible hoses between the manifold body and the blowing part, the space requirement at the steam distribution point is reduced and thus a structure is possible in which the small-sized blowing part can be turned from the operating position to the washing position. The solution is thus advantageous for space use. The space delimited by the press suction roll and the center roll scrapers is available for the construction of the blowing part and its movements. Correspondingly, the steam distribution body can be made a fair size and the fixed steam supply connection can be placed quite freely. In addition, the steam control valves can be positioned so that they are easily accessible for maintenance. In this case, the valves can be replaced a few at a time during maintenance, which means that the entire valve system can be kept in good condition and the need for spare valves can also be minimized.

15 The new design is especially suitable for Twinver-type press parts.

The steam box according to the invention in a paper / board machine is mainly characterized in that the steam box comprises a blowing part and a separate steam distribution body and hoses or the like between them.

20

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

Figure 1 shows the different positions of the steam box in connection with the Sym-Press II press section.

. · Figure 2 shows a steam box according to the prior art in an axonometric view and a cross-section at the end.

Figure 3 shows a steam box structure according to the invention in a cross-sectional view.

95404 3

In Figure 4, the structure according to the invention of the arrow in Figure 3 shows Ki direction.

Figure 5 shows another preferred embodiment of the valve structure.

Figure 6 shows another grouping of the steam hoses in the manifold and their connection to the manifold.

Figure 1 shows a target area of the invention for a steam box in connection with a Sym-Press II press. The different positions of the steam box are marked Bj ... B5.

10

Figure 2 shows a steam box according to the prior art in axonometric and end view and in a cross-sectional view. As shown in the figure, the steam is first introduced into the central distribution pipe (c) and through it into the actual distribution chambers (b) of the steam blowing box, the extension pipe (c) comprising outlet pipes (d) and flow control valves (e).

Figure 3 shows a structure according to the invention, in which the blowing part 11 of the steam box 10 is a separate body part which can be turned around the joint N or the joint mechanism or moved by guides or otherwise, which is connected to the distribution body 15 by flexible hoses.

The blowing part 11 comprises a steam distribution surface 12, for example a perforated plate, through which steam is distributed in connection with the pulp web / web W ... from the distribution chambers 13 of the blowing part 11. The blowing part 11 is adapted to pivot from the operating position to the washing position. As shown in the figure, the flexible hoses 14a1, 14a2 ... are connected between the blowing part 11 and the distribution body 15.

25

The manifold body 15 is preferably a tubular structure to which steam is first conducted, comprising valves 16a ^, 16a2 ··. Connected to the tube 17a ^ Yl ^ Yfoy .. such that by moving the valve stem 183 ^ 1832- .. a connection is opened from the internal steam space D to each of the manifold bodies. to the pipe 17ai, 17a2 ... through their openings Ej,! ^ .... Karan 18ai, 18a2 · ..

30 adjusts the throttle at points F1, F2 ... in the pipes 173 ^ 1732- .. Thus, by adjusting each valve 163 ^ 1632- .. the steam flow from the manifold 15 from its chamber 95404 4 to the flexible hoses 14aj, 14a2 ... and each flexible through the hose to the blowing part 11. The blowing part 11 is divided in the width direction of the machine into separate blocks A1, A2, A3 ... Thus, the amount of steam introduced into the web can be adjusted from the web width and thus the paper / board web moisture profile in the web width direction.

5

In Figure 4, the structure according to the invention of the arrow in Figure 3 shows Ki direction.

The flexible hoses 14a1,14a2 ... are connected from the manifold to the blow section to each of the partitions A1, A2, A3 separated by partitions. Figure 5 shows an embodiment of the invention in which the valves 16aj, 16a2 ... are fitted to each flexible joint connecting the blow part and the manifold. for hose 14a1,14a2 ....

By means of the valves 16aj, 16a2 ... the amount of steam flow can be adjusted via the hoses 17a1,17a2 .... Valves 16aj, 16a2 ... are manually adjustable or remote adjustable.

15. . . Fig. 6 shows a dense grouping of valves 16a1, 16a2 ... corresponding to the embodiment of Fig. 5. The valve division does not have to be the same as the block division of the blowing part 11. Valves 16aj, 16a2 ... are fitted to flexible hoses 14aj, 14a2 ____ The design of the manifold does not have to be a pipe over the whole machine, etc., but can be, for example, a tank.

20 The steam outlets can be located on different sides of the manifold.

The distribution body can also be segmented, i.e. compartmentalized or non-compartmentalized, in which case steam is transferred from a uniform space inside the distribution body via hoses or valves to the blowing part 11.

25

il Iti t Iitti I 1 t ¢ 1 ': J

Claims (7)

95404 A steam box in a paper / board machine through which steam is passed to a paper / board web, characterized in that the steam box (10) comprises 5 blowing sections (11) and a separate steam distribution body (15) and hoses (14a1,14a2 ... ) or equivalent. 2. The method according to claim 1, having regard to the operative part (15) of the separate separator valve (16a1,16a2 ...)> with a separate wedge of the head 10 (14a, 14a2 ...) and at the same time blends (11) and parts of the cardboard chamber (13) and därfrän via ängfördelningsytan (12) i förbindelse med kartonmaskinen / pappersmaskinen. Apparatus according to claim 1, characterized in that the distribution body (15) comprises separate valves (16a1, 16a2 ...) by means of which steam is led to the hoses 10 (14aj, 14a2 ...) and further to the blowing part (11) and its distribution chamber (13) and from there through the steam distribution surface (12) to the paperboard / paper web. 3. Anläggning enligt nägot av ovanstäende patentkrav, kännetecknad därav, 15 att bläsningsdelen (11) innefattar separata avsnitt (Aj, A2, A3 ...) utöver dess längd, vilka avsnitt är separerade med en mellanvägg frän varandra oci hän vilka ventilema (löaj.löa ^ ..). Apparatus according to one of the preceding claims, characterized in that the blowing part (11) comprises blocks (A1, A2, A3 ...) separated by its length, which are separated from one another by partitions and to which steam is conducted from valves (16a !, 16a2). ..). 4. Anläggning enligt nägot av ovanstäende patentkrav, kännetecknad därav, 20 att ventilema (16a1,16a2 ...) är anordnade i slangama (ΙΑ ^, ΙΑ ^ ···) · Apparatus according to one of the preceding claims, characterized in that the valves (16a1, 16a2 ...) are arranged in hoses (14a !, 14a2 ...). 5. An invention according to claim 1 or 2, provided that the valve (16a !, 16a2 ...) is a spindle valve and a spindle with a spindle (lSa ^ iea ^ ..), which is not provided with a regulator of the spindle from the chamber. (D) av fördelningsstommen 25 (15) account röret (17aj, 17a2,17a3) and därigenom account slangama (14a!, 14a2 ...) under det att vart vart och ett av rören (Ha ^ Ha ^ na-j ... ) innefattar öppningar (Ej.E ^ ...), via vilka φ • ängan överförs frän kammaren (D) innanför rören (17aj, 17a2 ...) och förbi spindeln (lSa ^ lSa ^ ..) via strypningsstället (F1, F2 ...). Apparatus according to claim 1 or 2, characterized in that the valves (16a1, 16a2 ...) are stem valves and comprise a movable stem (18aj, 18a2 ...) adapted to regulate the flow of steam from the chamber (15) of the manifold (15). D) to the pipe (17a1,17a2,17a3) and through it to the hoses (14aj, 14a2 ...) the pipe (17a1,17a2,17a3 ...) each comprising openings (Ej,% ...) through which the steam passes from the chamber (D) inside the tube 25 (17a1,17a2 ...) and past the mandrel (18a !, 18a2 ...) through the throttling point (F1} F2 ...). . Apparatus according to claim 1, characterized in that the distribution body (15) is blocked. Apparatus according to claim 1, characterized in that the manifold (15) is non-block comprising a uniform space from which steam is transferred to the blowing part (11). 95404 1. Ängläda i pappers- / kartonmaskin, via vilken änga leds i förbindelse med pappers- / kartonmaskinen, kännetecknad därav, att änglädan (10) innefattar en 5 bläsningsdel (11) och en separat änguppdelningsstomme (15) Mah slang ^ ..) or under the same conditions. 6. A method according to claim 1, which comprises the steps (15) of the invention or of the invention. 95404 7. An application according to claim 1, which comprises a method (15) in which it is possible to disclose the effect of the invention on account (11). 5