JP2015169397A - Combustion-promoting chimney cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an existing stove not using any oxidation catalyst to use oxidation catalyst without hindering combustion at the time of starting combustion.SOLUTION: This invention relates to a combustion-promoting chimney in which a steel plate is formed into a cylindrical shape and connected to the exhaust port side of a stove to constitute a part of the chimney, its inner circumferential side is provided with a catalyst arrangement part housing a column-like oxidation catalyst 20 having a vertical through-hole for performing a secondary combustion of not-yet combusted gas under a state in which its central line is coincided with a central line of the chimney cylinder. At the catalyst arrangement part, a clearance having a prescribed width is formed between an outer circumferential surface of the oxidation catalyst 20 and the inner circumferential surface of a chimney 10. At the starting time of combustion at the stove, air containing exhaust gas below the oxidation catalyst 20 passes through the clearance, exhibits a draft action while ascending in a chimney flue to promote the combustion at the stove.

Description

  TECHNICAL FIELD The present invention relates to a combustion promoting chimney cylinder that constitutes a part of a chimney extended from a stove, and in particular, a combustion promoting chimney capable of ensuring a draft action at the start of firing even if a secondary combustion catalyst is present. Related to the tube.

  A stove that uses a solid fuel such as soot has a problem that black smoke containing a large amount of unburned components is discharged because the fuel is burned at a relatively low temperature. Moreover, it is not preferable in terms of energy efficiency to discharge a large amount of unburned components, and soot, tar, creosote, etc. derived from black smoke adhere to the chimney inner wall and narrow the flue in a short period of time. There is also a concern of causing a flue fire due to these reasons.

  In response to this problem, Japanese Patent Laid-Open No. 2000-46334 discloses that a catalyst is disposed between the primary combustion chamber of the stove and the chimney base end, and unburned gas generated in the primary combustion chamber is reduced to a low temperature of about 250 degrees. However, a technology that enables combustion is proposed. As described above, the unburned gas and solid matter generated in the primary combustion chamber are secondarily burned by the catalyst, thereby achieving energy saving and exhaust purification.

  As the catalyst described above, there is known an oxidation catalyst called a combiner in which a noble metal such as platinum palladium or rhodium is attached to a structure forming a honeycomb-shaped through hole as shown in FIG. In general, a space with an opening for introducing exhaust gas from the primary combustion chamber is formed under the top plate, and an oxidation catalyst is disposed in the opening to form a secondary combustion chamber. is there.

  However, placing the oxidation catalyst in the middle of the passage from the primary combustion chamber to the chimney is a great resistance to the flow of exhaust, so the draft action due to the temperature difference between the flue and the outside air tends to be insufficient, and the stove begins to burn. At times, the resistance of the oxidation catalyst made the ignition of the fuel more difficult. Therefore, a bypass damper that bypasses the secondary combustion chamber is provided, and this is opened for a while from the time of ignition to obtain a draft.

  However, even when secondary combustion is performed with the above-described oxidation catalyst, not all unburned components are burned, and unburned materials such as soot adhere to the inside of the through-holes due to the honeycomb structure. This also leads to shortening the life as a catalyst while increasing the resistance by narrowing the through hole in a short period of time. In this case, it is conceivable to periodically take out the oxidation catalyst and clean and wash it. However, in a wood stove, it takes time to attach and detach the work itself. It is normal.

  In response to the above-mentioned problems, the inventors of the present application disclosed in Japanese Patent Application Laid-Open No. 2006-52912 forcibly supplying recombustion air into the combustion chamber by the forced air supply means for the purpose of supplementing the drafting action at the beginning of firing. We have proposed a supply technology that enables smooth ignition even when an oxidation catalyst is used. However, it is not easy to provide the forced air supply means in an existing stove, and even in an existing stove that does not use an oxidation catalyst, it does not have a secondary combustion chamber or bypass damper, and the oxidation catalyst remains as it is. Since it cannot be installed, it has been difficult to improve energy efficiency and purify exhaust.

JP 2000-46334 A JP 2006-52912 A

  The present invention is intended to solve the above-described problems, and it is an object of the present invention to make it possible to use an oxidation catalyst without hindering combustion at the beginning of burning for an existing stove that does not use an oxidation catalyst. And

  Therefore, the present invention is a chimney cylinder that forms a steel plate in a cylindrical shape and is connected to the exhaust outlet side of the stove to constitute a part of the chimney, and the unburned gas is secondarily introduced to the inner peripheral side thereof. It has a catalyst placement section for storing a cylindrical oxidation catalyst having a vertical through-hole to be burned in a state where its center line coincides with the center line of the chimney cylinder, and the catalyst placement section has an oxidation catalyst arranged A gap of a predetermined width is formed between the outer peripheral surface of the gas cylinder and the inner peripheral surface of the chimney cylinder, and when the stove begins to burn, the air including the exhaust gas below the oxidation catalyst rises in the flue through the gap and acts as a draft. A chimney for combustion promotion characterized by promoting the combustion of the stove.

  In other words, even with a stove that does not use an oxidation catalyst, it is possible to exert its catalytic function by placing the oxidation catalyst in a chimney connected to the stove, but in the stage where the draft action is weak at the beginning of the stove, Since the exhaust gas that rises passes near the inner peripheral surface of the chimney cylinder, in the present invention, a gap is formed between the inner peripheral surface of the chimney cylinder and the outer peripheral surface of the oxidation catalyst housed therein. The exhaust passes smoothly, making the ignition work easy, and at the stage where the combustion of the stove is stable and the drafting action is sufficient, the exhaust rises at the center of the chimney cylinder, so that the gap is present. However, most of the exhaust gas passes through the oxidation catalyst, so that the unburned gas is sufficiently processed.

  Moreover, in this combustion promoting chimney cylinder, if the width of the gap is 8 to 15% of the inner diameter of the catalyst arrangement portion, the draft action at the beginning of the stove and the normal stove It has an excellent balance of catalytic action during combustion.

  Furthermore, in the above-described combustion promoting chimney cylinder, the chimney cylinder peripheral wall having the catalyst arrangement portion is provided with an outlet having a larger lateral width and vertical width than the oxidation catalyst, and can be opened and closed by an opening / closing door. If it is closed and the operation of the oxidation catalyst can be taken in and out through this outlet, the attachment and detachment operation of the oxidation catalyst becomes extremely easy. It will be easy to do.

  In this case, the catalyst arrangement part has a larger outer diameter than the oxidation catalyst, and is detachably provided with a placement net on which the removal port is placed with the oxidation catalyst placed thereon. If it is characterized in that it can be taken in and out, maintenance work can be reduced by taking out the oxidation catalyst and the loading net at the same time and performing cleaning and washing.

  Furthermore, the connection part for connecting the jet outlet of a predetermined blowing means to the peripheral wall above the catalyst arrangement part of the above-mentioned combustion promoting chimney cylinder or the peripheral wall of another chimney cylinder connected to the upper end side of the peripheral wall And supporting means for supporting the air blowing means on the outer peripheral side of the peripheral wall in a state where the air blowing means is connected, and by connecting the jet port to the connection portion and operating the air blowing means, If the jetted air is introduced upward through the connecting part and rises in the flue, the upward air in the flue above the catalyst at the beginning of the burning of the stove with a weak draft action A flow will occur, and combustion will be further promoted.

  In this case, if the connected blowing means is characterized in that hot air of a predetermined temperature or higher can be generated and ejected, the draft action is further promoted by the hot air. In addition, since the chimney cylinder peripheral wall constituting the flue is warmed in a short time, the combustion state of the stove is easily stabilized in a short time after ignition.

  In addition, in the above-mentioned, the peripheral wall made of the steel plate having the cylindrical shape is made of a single layer type except for the connecting portion, so that the two parts by the oxidation catalyst in addition to the heat of the exhaust gas by the primary combustion. Since the heat of the next combustion is easily used for indoor heating due to radiation or conduction, the room is likely to be warmed up in a short time at the stage of starting the stove, and it is advantageous in terms of energy efficiency.

  According to the present invention in which an oxidation catalyst is housed inside a chimney cylinder connected to the stove and a gap is provided on the outer peripheral side thereof, the oxidation catalyst can be easily used without hindering combustion at the start of burning.

It is a side view (a house is a section) showing the whole chimney structure provided with the chimney cylinder for combustion promotion which is an embodiment in the present invention. It is an expansion exploded view of the chimney cylinder for combustion promotion of FIG. FIG. 3 is an enlarged cross-sectional view of the combustion promoting chimney cylinder of FIG. 2 cut above the oxidation catalyst. It is a perspective view which shows the structure of the oxidation catalyst of FIG. 3, and its mounting net | network. FIG. 2 is an enlarged partial longitudinal sectional view for explaining the function of the combustion promoting chimney cylinder of FIG. 1. It is a partial side view which shows the application example of the chimney cylinder for combustion promotion of FIG. (A) is a partial side view showing a modification of the combustion promoting chimney cylinder of FIG. 6, (B) is a schematic cross-sectional view showing the insertion direction of the heat gun of (A), and (C) is of (B). It is the schematic cross-sectional view which shows a modification. (A) is a schematic longitudinal sectional view showing the state of exhaust in the chimney when the stove begins to burn, and (B) is a schematic longitudinal section of the chimney showing the state of exhaust in the chimney during the normal combustion of the stove. FIG. It is a perspective view which shows an example of an oxidation catalyst.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows an arrangement state of a chimney 1 partially including a combustion promoting chimney cylinder 1A according to the present embodiment. This combustion promoting chimney cylinder 1A is connected to the exhaust port side of a soot stove 100 of a system that does not use an oxidation catalyst for secondary combustion, and constitutes the base end side portion of the chimney 1 that guides the exhaust to the outside, Whereas the peripheral wall of the chimney stack 1C constituting the part penetrating the roof from the outside is a double layer (double) with double steel plates, the peripheral wall excluding the connecting portion is a single layer made of a single steel plate. Formula (single).

  The configuration will be described in detail with reference to FIGS. 2 to 4. The combustion promoting chimney cylinder 1A of the present embodiment is composed of three parts of two chimney cylinders 10 and 11 and an adapter 12 to the stove exhaust port. Become. The chimney cylinder 10 as the main part is formed by forming a single steel plate into a cylindrical shape, and is connected to the wood stove 100 through the adapter 12, but is discharged from the wood stove 100 to the inner peripheral side thereof. The catalyst arrangement part which accommodates the cylindrical oxidation catalyst 20 which recombusts the unburned gas etc. which were performed is provided in the vertical center position.

  FIG. 3 is a cross-sectional view for explaining the configuration of the catalyst arrangement section by cutting the chimney cylinder 10 at a position above the oxidation catalyst 20. In this catalyst arrangement portion, an oxidation catalyst 20 called a combiner having honeycomb-shaped through holes vertically penetrated is placed on a placement net 40 so that its center line coincides with the center line of the chimney cylinder 10. A gap having a predetermined width is formed between the outer peripheral surface of the oxidation catalyst 20 and the inner peripheral surface of the straight tubular chimney cylinder 10.

  By adopting such a configuration, at the beginning of the burning of the stove from the ignition until the combustion state of the fuel becomes stable, the air below the oxidation catalyst 20 exhibits a draft action while rising through the gap in the flue. Therefore, it has a function of accelerating combustion in the wood heating stove 100, and this is the most characteristic part of the present invention.

  In other words, if an oxidation catalyst for reburning unburned gas is placed in the exhaust passage of the stove, this will be a great resistance to the exhaust flow, so there must be an oxidation catalyst at the beginning of the stove with a weak draft action. However, there was a problem that the ignition work became more difficult. Therefore, the oxidation catalyst 20 is built in the chimney cylinder 10 constituting a part of the chimney, and a gap for circulating air is provided on the outer peripheral side thereof, so that the drafting action is hardly inhibited even at the beginning of the stove burning. It is.

  Also, in this case, at the beginning of the drafting with a weak draft action, as shown in FIG. 8 (A), the flow of the exhaust gas having a relatively small flow rate passes closer to the inner peripheral surface of the chimney cylinder (outer edge side of the flue). However, in the present invention in which a predetermined gap is provided on the inner peripheral side of the chimney cylinder, even if the oxidation catalyst 20 is present in the exhaust passage, the flow of the exhaust gas is hardly inhibited. .

  Further, as shown in FIG. 8 (9), at the stage where the combustion is stable and the drafting function sufficiently functions, the flow of exhaust gas whose flow rate has increased passes through the center side of the chimney cylinder and becomes closer to the center. Although it is known that large particles pass through, most of the exhaust gas passes through the oxidation catalyst 20 even when the outer peripheral side of the oxidation catalyst 20 is free as described above, so that an excellent secondary combustion function and good particles are obtained. The capture function will be demonstrated.

  The gap size on the outer peripheral side of the oxidation catalyst 20 will be described with reference to FIG. 3. In the case of the present embodiment, when the outer diameter Y of the oxidation catalyst 20 to be used is 150 mm, the inner diameter X of the chimney cylinder 10 is about 200 mm. The gap Z is assumed to be about 25 mm. This is because, as a result of the inventors conducting tests in many patterns for each of these sizes, the gap X is equal to the inner diameter of the catalyst arrangement portion from the viewpoint of the balance between the draft action at the start of firing and the catalyst function at the time of combustion stabilization. This is due to the conclusion that 5 to 20% is preferable and 8 to 16% is more preferable.

  Referring again to FIG. 2, in this chimney cylinder 10, an outlet 10 a having a lateral width and a vertical width larger than that of the oxidation catalyst 20 is opened on the peripheral wall of the portion where the catalyst arrangement portion is located. The opening / closing door 10b is closed with a hinge so that it can be opened and closed, and the operation of the oxidation catalyst 20 can be taken in / out through the outlet 10a. When the opening / closing door 10b is closed, it can be locked by the engaging body 10c. It is like that.

  The chimney cylinder 10 has a placement net 40 for placing the oxidation catalyst 20 made of a steel wire having a diameter larger than that of the oxidation catalyst 20 and substantially the same as the inner diameter of the catalyst arrangement portion (slightly smaller diameter). These are arranged on the latching claws 10d, 10d, 10d, and 10d protruding from the inner peripheral surface of the chimney cylinder 10, and these and a space for accommodating the oxidation catalyst 20 constitute a catalyst arrangement portion. Yes.

  As shown in FIG. 4, the mounting net 40 is provided with a catalyst fixing wall 40 a in which a strip-shaped steel plate is formed in an annular shape having an inner diameter slightly larger than the outer diameter of the oxidation catalyst 20 on the upper surface side. In addition, by inserting and placing the oxidation catalyst 20 on the inner peripheral side thereof, the center line is fixed in a state of being coincident with the center line of the chimney cylinder 10, and the placement surface thereof The portion of the net that constitutes is lifted from a leg portion in which a steel wire is formed in a circular shape.

  Therefore, with the open / close door 10b having a width larger than the outer diameter of the placement net 40 opened, an appropriate plate material can be inserted into the gap between the leg portion and the net on the upper surface to slightly lift it. In this case, the placement net 40 can be pulled out from the outlet 10a with the oxidation catalyst 20 placed thereon, so that the placement net 40 can be taken out together with the oxidation catalyst 20 and cleaned / washed by a simple operation. In the present embodiment, the gap Z between the outer peripheral surface of the oxidation catalyst 20 and the inner peripheral surface of the chimney cylinder 10 is slightly smaller (about 2 mm) by the catalyst fixing wall 40a.

  As shown in FIG. 2, the combustion promoting chimney cylinder 1 </ b> A of the present embodiment is integrated by inserting and connecting the lower end side of another chimney cylinder 11 to the upper end side of the chimney cylinder 10. In addition to the characteristic configuration described above, the peripheral wall of the chimney tube 11 is provided with an insertion tube 11c serving as a connecting portion for connecting the jet port of the air blowing means, and the air blowing means is connected to the insertion tube 11c. As a support means for supporting on the outer peripheral side of the peripheral wall, there is also a feature that a support arm 11a formed by bending a steel wire in a U-shape and connecting the base end side to the outer surface of the peripheral wall is provided.

  That is, by operating a blowing means such as the sirocco fan 30A with the ejection port connected to the insertion cylinder 11c, the blown air rises in the flue while being introduced upward through the insertion cylinder 11c. Therefore, since an upward air flow is generated in the flue above the oxidation catalyst 20 at the beginning of the burning of the stove where the draft action is weak, combustion in the stove is further promoted.

  The insertion tube 11c has an inner peripheral surface that is tapered within a predetermined range from the opening (see FIG. 5), and ensures adhesion even when a jet port of various outer diameters is inserted. In addition, a cap 11d is attached to the opening via a hinge, and when the air blowing means is not used, the opening is closed with the cap 11d, thereby ensuring the inside / outside sealing performance and the draft. It is possible to make it difficult to inhibit.

  Further, the support arm 11a is made of a steel wire excellent in spring elasticity, and its tip side is elastically swingable in the vertical direction as indicated by a broken line, so that the lower side of the blowing means If it is supported in a lowered state while being inserted into the U-shaped tip, it can be brought into close contact by pressing the blower outlet into the insertion tube 11c while lifting the blowing means by its elastic repulsive force. .

  The function of the combustion promoting chimney cylinder 1A described above with reference to FIG. 5 will be described in detail below. Since the nozzle 11b is extended at the tip of the insertion cylinder 11c into which the ejection nozzle of the sirocco fan 30A is inserted, and the tip is opened upward at substantially the center line position inside the chimney cylinder 11, so that the wood stove 100 is ignited. When the sirocco fan 30A is sometimes driven, indoor air can be introduced into the flue above the oxidation catalyst 20 and ejected upward.

  By using the air blowing means in this way, the seasonal indoor air that uses the stove has a higher temperature than the outdoor air in the chimney opening, so that an upward air flow is generated in the flue. The function of promoting the drafting action when the stove starts is exhibited. At this time, the exhaust gas mixed with the combustion gas from the wood stove 100 and the sucked indoor air has a low flow rate and passes through the outer edge side of the flue at this stage, and therefore, the inner diameter X of the chimney cylinder 10 and the outer diameter Y of the oxidation catalyst. Ignition / combustion is promoted while smoothly passing through the gap Z due to the difference.

  When the combustion in the wood stove 100 is settled, the draft is sufficiently obtained. At that time, the driving of the sirocco fan 30A is stopped, or this is removed from the insertion port 11c and the cap 11d What is necessary is just to close an opening part. Further, at the stage where the draft is sufficiently obtained, the exhaust gas of the wood heating stove 100 rises mainly through the central portion of the flue as described above, so that even if there is a gap Z, most of the flow rate is the oxidation catalyst 20. Will be catalyzed through.

  Further, since the peripheral wall of the combustion promoting chimney cylinder 1A is a single-layer type except for the connecting portion, the heat generated by the secondary combustion of the unburned gas by the oxidation catalyst 20 forms the peripheral wall. It will be used for indoor heating by conduction or radiation through a single steel plate. Therefore, the present embodiment is also excellent in energy saving performance. In particular, at the beginning of the burning of the stove, it took time until the wood heating stove 100 main body made of a thick casting was warmed. On the other hand, the single-layer chimney cylinders 10 and 11 are warmed in a short time and exhibit a heating function, so that they have excellent room temperature rise performance at the start of heating.

  In addition, as described above, the combustion promoting chimney cylinder 1A of the present embodiment can be used as a catalytic stove simply by connecting to the exhaust port of a stove that does not use a catalyst. It is not necessary to purchase a relatively expensive catalytic stove with a chamber, and a similar catalytic function can be realized at a low cost while using a relatively inexpensive existing stove. Since the catalyst can be washed relatively easily, a good catalyst function can be easily exhibited over a long period of time.

  FIG. 6 shows an application example of the above-described embodiment, and a heat gun (industrial dryer) 30 </ b> B capable of generating and blowing hot air of 400 ° C. or more as air blowing means attached to the chimney cylinder 11. The case where is used is shown. In this case, since the air to be ejected is high temperature, the draft action is superior to the case of using the indoor air described above.

  Moreover, since the surrounding wall which comprises a flue with the hot air by the heat gun 30B heats up in a comparatively short time, it becomes easy to obtain a normal draft at an early stage. Since the chimney cylinder 11 and the chimney cylinder 1B connected to the chimney cylinder 11 are of a single-layer type as described above, the hot air of the heat gun 30B is also used for indoor heating via the circumferential wall of the chimney cylinder. This also contributes a little to the speed of heating.

  FIG. 7A shows a case where two heat guns 30B are used as a modification of the combustion promoting chimney cylinder of FIG. 6, but as shown in FIG. By setting the directions to be shifted, the hot air of the two rises spirally while being entangled in the central portion of the flue, so that a better draft can be easily obtained. Moreover, as shown in the figure (C), the effect mentioned above becomes still more remarkable by combining the three heat guns 30B similarly.

  As described above, with respect to existing stoves that do not use an oxidation catalyst, the present invention makes it possible to easily use an oxidation catalyst without inhibiting combustion at the start of burning.

  1A Combustion promotion chimney cylinder, 10, 11 Chimney cylinder, 10a outlet, 10b Open / close door, 11a Support arm, 11b, 11e Nozzle, 11c Insertion port, 20 Oxidation catalyst, 30A Sirocco fan, 30B Heat gun, 40 Mounting network, 100 wood stove

Claims (6)

  A chimney cylinder that is formed in a cylindrical shape and is connected to the exhaust outlet side of the stove to constitute a part of the chimney. A catalyst placement portion for accommodating a cylindrical oxidation catalyst having a hole in a state in which the center line thereof coincides with the center line of the chimney cylinder, and the catalyst placement portion includes an outer peripheral surface of the placed oxidation catalyst. And a gap of a predetermined width is formed between the inner surface of the chimney cylinder, and at the beginning of the burning of the stove, air including the exhaust gas below the oxidation catalyst rises in the flue through the gap and performs a draft action. A chimney cylinder for promoting combustion, which is demonstrated to promote combustion of the stove.   2. The combustion promotion chimney according to claim 1, wherein a width of the gap is 8 to 15% of an inner diameter of the catalyst arrangement portion.   The chimney cylinder peripheral wall with the catalyst arrangement portion is provided with an outlet having a larger left and right width and upper and lower width than the oxidation catalyst, and is closed in a state that can be opened and closed by an open / close door. The combustion promoting chimney cylinder according to claim 1 or 2, wherein the oxidation catalyst can be taken in and out.   The catalyst placement portion is detachably provided with a placement net for placing the oxidation catalyst having an outer diameter larger than that of the oxidation catalyst, and the take-out port remains with the oxidation catalyst being placed. The chimney for a combustion device according to claim 1, 2 or 3, characterized in that an operation for taking in and out is possible.   The peripheral wall of the upper part of the catalyst arrangement part or the peripheral wall of another chimney cylinder connected to the upper end side of the peripheral wall is provided with a connection part for connecting a jet port of a predetermined air blowing means, and the air blowing means is connected In this state, a support means for supporting the air blowing means is provided on the outer peripheral side of the peripheral wall, and the blown air is operated upward by connecting the jet port to the connecting portion and operating the air blowing means. The combustion promoting chimney cylinder according to claim 1, 2, 3 or 4, wherein the chimney cylinder rises in the flue by being introduced into the flue.   The combustion promoting chimney according to claim 5, wherein the connected blowing means is capable of generating hot air having a predetermined temperature or more and ejecting it.

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