JP5856082B2 - Oxidation furnace - Google Patents

Description

  The present invention is an oxidation furnace for the oxidation treatment of fibers, in particular for the production of carbon fibres, which is a) an airtight housing excluding the fiber inlet and outlet regions, and b) disposed inside the housing. C) disposed in the central region of the process chamber, so that hot air can be blown into the process chamber in the opposite direction, spaced vertically above each other, and A blowing device comprising a plurality of blowing boxes each having an inlet hole for hot air and an outlet hole for hot air on the opposite side; and d) hot air from the process chamber in both opposing end regions of the process chamber E) each suction device for drawing in, e) a small amount of hot air circulating through the blow-out device, the process chamber and the two suction devices And f) at least one heating device arranged in the fluid path of the circulating hot air, and g) guiding the fibers in a meandering manner through a gap between the blowing boxes arranged above each other And an oxidation furnace having a guide roller.

  There are various ways to induce hot air to treat the fiber passing through the oxidation furnace. Oxidation furnaces that induce air by the principle of "flowing from center to end" have gained support. In this oxidation furnace, in the central region of the process chamber, hot air is blown in both directions, ie in the direction of the opposite ends of the process chamber, and is drawn again by a suction device at these two ends of the process chamber. The process chamber can also be viewed as an area for various temperatures and air flows that can be repeated in the longitudinal direction of the furnace.

  In known oxidation furnaces of the type described at the outset, the blowing box forming the blowing device has a continuous top and bottom surface and outlet holes for hot air only on the opposing narrow end faces. This is not a specific method, in any case that hot air does not flow through the gaps between the blowout boxes located above each other and that the fibers are not oxidized when passing through these gaps. means. Since the blowout box needs to have large dimensions for air distribution, the distance at which the fibers are not oxidized by the absence of air flow is never negligible.

  The object of the present invention is to realize an oxidation furnace of the type described at the outset, whereby the defined dimensions of the oxidation treatment of the fibers are configured such that the furnace can be of a relatively small volume, in particular a low furnace structure. There is.

  For this purpose, h) two stacks of blowout boxes arranged in the upper space above each other are provided, arranged in the space behind the other as viewed from the direction of fiber movement, and / or i A stacked blowing box arranged above the other is realized according to the invention with at least one additional outlet hole for hot air on the top and bottom surfaces.

  The basic idea according to the invention for both structural options is the same and each can be realized essentially in the same furnace.

  In the first option, the dimensions of the blowing box are such that the movement of the fibers is such that the volume of the two blowing boxes arranged behind the other corresponds to the total volume of one blowing box in the conventional design. Seen from the direction, it is smaller. The size between the two blow-out boxes can increase the amount of hot air in the gap between the blow-out boxes arranged above the other, and this has not been realized in the prior art. Accordingly, the gap between the blow-out boxes arranged above the other can actively carry out the oxidation treatment of the fibers.

  Another second structural option, in which the volume of the individual blowing boxes can be practically equal to the volume of the conventional structure, functions in a similar manner. Additional air outlet holes provided in the top and bottom surfaces allow hot air to flow through the gap between the blow-out boxes located above the other as well, so that the fibers placed in the gap An oxidation step can be performed on this part. Thus, by using a path through which fibers are better than the prior art, an overall smaller oxidation furnace structure can be realized.

  Particularly useful, the furnace can be made lower with the same furnace length. This is an advantage related to the entire range, but only requires a shorter meandering path for the fiber through the process chamber, so the deflection roller for the fiber and the area where the fiber enters the process chamber and from the process chamber. It is possible to save a locking device that prevents air from leaking in the exit area. Furthermore, the entire furnace is lightweight, which is preferable in terms of cost in the steel structure that constitutes the furnace. Furthermore, the increased air flow around the fibers in the process chamber improves the quality of the manufactured product.

  If the horizontal distance between adjacent stacks of blowout boxes is equal to twice the vertical distance between the blowout boxes of the stack and at most equal to the dimensions of the blowout boxes in the longitudinal direction of the furnace Is preferred. This product determines the state of flow in the area between the laminates and in the area between the blow-out boxes arranged above each other.

  In another second construction, it is preferred if the blowing box has a plurality of additional outlet holes for hot air along the center line at the top and bottom surfaces. This means also functions to guide the hot air in a controlled manner.

  Exemplary embodiments according to the present invention will be described in more detail with reference to the drawings shown below.

FIG. 3 shows a longitudinal section through an oxidation furnace for the production of carbon fibers according to the line II in FIG. 2. 2 shows a cross-sectional view of the oxidation furnace of FIG. Fig. 2 shows an enlarged detail view of Fig. 1 in the area of the blowing device. FIG. 6 shows a cross-sectional view of a top view of a blowout box used in another exemplary embodiment of an oxidation furnace according to line IV-IV in FIG. 5. The top view of the blowing box of FIG. 4 is shown.

  Referring initially to FIGS. 1-3, these figures illustrate a first embodiment of an oxidation furnace, indicated generally by the reference numeral 1, and are used to produce carbon fiber. The oxidation furnace 1 includes a housing 2 composed of two vertical side walls 2a and 2b, two vertical end walls 2c and 2d, an upper wall 2e, and a bottom wall 2f. The housing 2 is airtight except for the two regions 3 and 4 of the end wall 2c and the end wall 2d, into which the fibers 20 to be treated are guided in and out and have special locking devices.

  In particular, as shown in FIG. 2, the interior of the housing 2 includes an actual process chamber 6 by a vertical partition wall 5 and air induction chambers 7, 8, 9, 10, 11, 12 disposed on the side of the process chamber. And divided into As a whole, the inside of the oxidation furnace 1 is substantially mirror-symmetrical with respect to the vertical center plane SS shown in FIG.

  The blowing device, indicated as a whole by the reference numeral 13 and described in detail below, is arranged in the central region of the process chamber 6. The suction device 14 and the suction device 15 are arranged in two outer end regions of the process chamber 6 adjacent to the inlet region 3 and the outlet region 4, respectively.

  Two directionally opposed air circulation paths are maintained inside the housing 2, for example air starts from the suction devices 14, 15, through the air induction chamber 7 and the air induction chamber 12 and the filters 16 and It is guided to the filter 17 and then to the air induction chamber 8 and the air induction chamber 11 through the heating unit 18a and the heating unit 18b in the direction of the arrow shown in FIG. The heated air is drawn from the air induction chamber 8 and the air induction chamber 11 by the ventilator 21 a and the ventilator 21 b and blown out to the air induction chamber 9 and the air induction chamber 10. From there, the air in each case reaches one of the halves of the blowing device 13 described in more detail below, from there to the process chamber 6 and from there to the suction device 14 and the suction device 15 in the opposite direction. Thereby making two rounds of the two air circulation paths.

  Two outlets 30 a and 30 b are provided on the wall of the housing 2. They are produced during the oxidation process so as to maintain the balance of the air in the oxidation furnace 1 or those large quantities of gas or air that reach the process chamber 6 as fresh air by the inlet region 3 and the outlet region 4 Can be used to dispense. Exhaust gas, which may also contain toxic components, is supplied for heat after combustion. The heat generated thereby can be used to preheat at least the fresh air supplied to the oxidation furnace 1.

  The detailed structure of the blowing device 13 will be described below.

  It comprises two “laminates” of blowout boxes 18. Each of these blowout boxes 18 has a shape of a hollow cuboid whose longitudinal dimension extends laterally over the entire width in the longitudinal direction of the process chamber 6. The narrow sides of the blowing box 18 each facing the process chamber 6 are configured as a perforated plate 18a. Each end face of each blowing box 18 communicates with the air induction chamber 9 and the air induction chamber 10, so that the air transported by the ventilator 20 and the ventilator 21 flows into the inside of the blowout box 18, respectively. The plate 18a can blow out from there.

  In each of the two laminates, the various blowout boxes 18 are arranged at a small distance above each other, the two laminates of blowout boxes 18 being viewed from the longitudinal direction of the furnace or the direction of movement of the fibers 20. And similarly spaced from the other. Preferably (unlike the relationship shown in FIG. 1), the vertical distance between the two blowout boxes 18 in the stack is equal to the distance between the stacks 18 in the longitudinal direction of the process chamber 6.

  The two suction devices 14, 15 are substantially formed by respective stacks of suction boxes 19 extending in a manner similar to the blowout box 18 in a direction transverse to the whole process chamber 6, With their narrow sides extending across the longitudinal region, they are configured as perforated plates 19a. Here, the holes of the perforated plate 19a can have any geometric shape. The suction box 19 in the suction devices 14 and 15 is at an equal vertical distance from the other, like the blow box 18 in the blow device 13.

  The fiber 20 to be treated is supplied to the oxidation furnace 1 by the deflecting roller 21 and passes through the locking device 22, which is not to be noted in the context of the present invention. It functions to prevent leakage from the outside. The fibers 20 then pass through the gap between the suction boxes 19 arranged above the other, through the process chamber 6 and through the gap between the blowing boxes 18 arranged above each other in the blowing device 13 At opposite ends of the chamber 6, they pass through a gap between the suction boxes 19 arranged above each other and are guided through the locking device 23.

  In order for the path of the fibers 20 through the process chamber 6 outlined to be repeated in a serpentine manner several times, a plurality of deflection rollers 24 and deflection rollers 25 with the axes arranged in parallel on the other side are connected to the oxidation furnace. 1 in both end regions. After the uppermost path through the process chamber 6, the fibers 20 exit the oxidation furnace 1 and are guided by further deflection rollers 26.

  During the serpentine path of the fibers 20 through the process chamber, they are covered by hot oxygen-containing air and thereby oxidized. The outlet from the oxidation furnace 1 substantially completes at least one oxidation step. Further oxidation steps are shown below.

  FIG. 3 shows the movement of the air flow in the area of the blowing device 13. Air that flows into the interior of each blowing box 18 by the corresponding ventilator 20 and ventilator 21 is provided on the opposite side of both of the blowing boxes 18 by a perforated plate 18a provided on both narrow longitudinal sides of the inlet box 18. Can be blown out to the part. Thereby, in the area of the gap between the two stacks of the blowout box 18, the air flow impinges in the opposite direction shown in FIG. This impingement causes the air to swirl there, passing through the gap between the blow-out boxes 18 located above each other in each of the two stacks in the direction of the opposite end regions of the process chamber 6, thereby corresponding suction devices 14 and 15 are generated. This part of the air carried by the blowing box 18 also flows around the fibers 20 in a path arranged between the blowing boxes 18. Therefore, these pathways are effective in the oxidation process. It is therefore possible to reduce the height of the furnace compared to the prior art oxidation furnace outlined at the beginning with equal furnace lengths. The advantages associated with this are as already described above.

  4 and 5 show the blowing box 118 of FIGS. 1 to 3 that can be used in another exemplary embodiment of an oxidation furnace and in each case replaceable with a pair of blowing boxes 18. In this exemplary embodiment, they are arranged at the same height adjacent to the other of the two various laminates. Instead of two individual blowing boxes 18 spaced apart in the longitudinal direction of the process chamber 6, the dimensions viewed in parallel to the longitudinal direction of the process chamber 6 correspond to the two blowing boxes 18 in FIG. 1. A common blowout box 118 can be used that corresponds to the sum of the dimensions to be measured.

  The blowing box 118 according to FIGS. 4 and 5 has a plurality of air outlet holes 130 in each case instead of a gap between two mutually adjacent blowing boxes 18, thereby allowing air to flow in FIGS. It can be blown out from the (common) blowout boxes 118 on the top and bottom as indicated by the arrows 5. This allows a flow pattern similar to that shown in FIG. 3 to be achieved, increasing the air flow along the top and bottom surfaces of the blowout box 118 parallel to the direction of fiber movement, It is also possible for the air flow to cover the fibers between the blowing boxes, where the oxidation process can be started.

  4 and 5, the air induction chamber 9 and the air induction chamber 10 of FIG. 2 are integrated to supply air to the blowing box 118 together.

Claims (5)

An oxidation furnace of Me other oxidation processing of the fibers,
a) an airtight housing excluding the fiber inlet and outlet regions;
b) a process chamber disposed within the housing;
by being located in the central region of c) the process chamber can be hot air is blown into the process chamber in the opposite direction, it is stacked at a distance from each other in lead straight direction, and the inlet hole and the opposite hot air A blowout device comprising a plurality of blowout boxes each having an outlet hole for hot air on a side portion;
d) respective suction devices in both opposing end regions of the process chamber for drawing hot air from the process chamber;
e) at least one ventilator for circulating hot air through the blowing device, the process chamber and the two suction devices;
f) at least one heating device arranged in the fluid path of the circulating hot air;
g) In an oxidation furnace having a guide roller that guides fibers in a meandering manner through a gap between the blow-out boxes stacked apart in the vertical direction ,
h) two stacks of the blow-out boxes (18) stacked apart in the vertical direction are provided , arranged so as to be spaced apart and adjacent in the moving direction of the fibers (20), and / or
i) Oxidation furnace characterized in that the blowout box (118) in the form of a stack has at least one additional outlet hole (130) for hot air on the top and bottom surfaces. The oxidation furnace according to claim 1, which is an oxidation furnace for producing carbon fiber. The horizontal distance between the stacks arranged adjacent to each other of the blowout boxes (18) is equal to twice the vertical distance between the blowout boxes (18) of the stack. Oxidation furnace. The horizontal distance between stacked bodies arranged adjacent to each other of the blowing box (18) is at most equal to the size of the blowing box (18) in the longitudinal direction of the oxidation furnace (1). Item 4. The oxidation furnace according to Item 1. Oxidation furnace according to claim 1, characterized in that the blowing box (18) has a plurality of additional outlet holes (130) for hot air along the centerline at the top and bottom.

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