JP5450869B1 - Thermal storage structure of a thermal storage burner - Google Patents

Abstract

Provided is a heat storage section structure of a heat storage burner that is easy to construct, can be manufactured in a short time and at a low cost, and is compact and can be installed in a small space. .
A casing 4 containing a spherical heat storage material 3 for recovering heat from exhaust gas and heating the combustion air with the recovered heat is provided in a burner gas passage 1 in which combustion air and exhaust gas alternately flow. In the heat storage section structure of the heat storage burner, the casing is formed with a central region CA in which combustion air and exhaust gas circulate in the heat storage material, and the heat storage material near the inner surface 9a side of the casing is arranged so as to surround the center region. A protruding wall 14 is provided that forms an outer peripheral area OA that prevents the combustion air and exhaust gas from flowing.
[Selection] Figure 1

Description

  The present invention relates to a heat storage section structure of a regenerative burner provided with a heat storage material that recovers heat from exhaust gas and heats combustion air with the recovered heat in a burner gas passage in which combustion air and exhaust gas alternately flow. .

  For example, the "fuel preheating mechanism in a regenerative burner" in Patent Document 1 is a regenerative burner in which a heat exchange section configured by a heat storage section using a heat storage body as a fuel path from a fuel supply source to a fuel ejection section is provided. It is set as the structure made to go through, and after the fuel from a fuel supply source is preheated by the heat exchange part of a thermal storage part, it is set as the structure made to eject from a fuel ejection part.

  In addition, the “heat storage device and heat storage type burner” of Patent Document 2 is a heat storage device used to improve the heat conversion efficiency of the heating furnace, and in the exhaust gas containing side space of the heat storage body storage container in which the heat storage body is stored. A barrier block is provided, and an air supply nozzle is provided in the exhaust gas outlet side space. The combustion exhaust gas is dispersed and supplied to the heat storage body by the barrier block, and the combustion air is partially concentrated by the air supply nozzle. It supplies to the heat storage body.

JP 2000-97427 A Japanese Patent Laid-Open No. 9-178162

  The furnace heated by the combustion flame of the regenerative burner becomes as high as about 1300 degrees. The heat storage unit sucks high-temperature exhaust gas from the furnace. For this reason, the heat storage part needs to cover the outer side of the heat storage material accommodated in the heat storage part with a refractory having a sufficient thickness that can withstand the temperature of the exhaust gas so as to have fire resistance as in the furnace.

  When covering a heat storage material with a general amorphous refractory, multiple processes such as mold assembly, refractory pouring, drying, etc. are required and the work is complicated. There is a problem that the work cost increases. In addition, since the refractory needs to have a sufficient thickness that can withstand the temperature of the exhaust gas, there is a problem that the size of the heat storage section increases and a large installation space is required.

  The present invention was devised in view of the above conventional problems, is easy to construct, can be manufactured in a short time and at a low cost, and has a compact form and is installed in a space-saving manner. It aims at providing the thermal storage part structure of the thermal storage type burner which can do.

The heat storage part structure of the regenerative burner according to the present invention accommodates a heat storage material that recovers heat from the exhaust gas and heats the combustion air with the recovered heat in the burner gas passage in which combustion air and exhaust gas circulate alternately. In the heat storage part structure of the heat storage burner provided with the above-described casing, the casing is provided with a central region in which combustion air and exhaust gas circulate in the heat storage material, and is disposed so as to surround the central region. The heat storage material in the vicinity of the inner surface side is provided with a closing member that forms an outer peripheral region that prevents the flow of combustion air and exhaust gas , and the heat storage material is a large number of spheres filled inside the casing, Is a plurality of annular shaped projecting walls projecting inward from the inner surface of the casing, and the projecting walls at both ends of the casing communicate with the burner gas passage. And the projecting walls are spaced apart from each other at an interval wider than the outer dimension of the sphere so as to restrict the movement of the sphere and hold it in the outer peripheral area between the openings at both ends of the casing. It is characterized by being able to.

The heat storage section structure of the heat storage burner according to the present invention is easy to construct, can be manufactured in a short time and at a low cost, and is compact and can be installed in a space-saving manner. . Specifically, combustion air and exhaust gas circulate in a central region having both ends of an opening formed by a protruding wall and an opening formed by the protruding wall. In the outer peripheral region formed in an arrangement that surrounds the periphery of the central region, once the combustion air or exhaust gas enters between adjacent protruding walls, the pressure stabilizes, and thereafter, the combustion air and exhaust gas flow in the outer peripheral region. Is disturbed. For this reason, in the outer peripheral region, combustion air and exhaust gas do not enter between the heat storage materials held between the projection walls by the projection walls, that is, the heat storage materials near the inner surface side of the casing. Thus, since the combustion air and exhaust gas do not circulate in the outer peripheral region by the protruding wall provided in the casing, the heat storage material filled between the protruding walls can function as a heat insulating material. In particular, since the plurality of projecting walls are provided by projecting from the inner surface of the casing to the inside of the casing, it is possible to restrict the movement of the spherical heat storage material, and to prevent the circulation of combustion air and exhaust gas in the outer peripheral region, The temperature rise near the inner surface side of the casing can be suppressed.

It is a longitudinal cross-sectional view which shows suitable one Embodiment of the thermal storage part structure of the thermal storage type burner which concerns on this invention. It is a partially expanded perspective view which shows a mode that the heat storage part in the heat storage part structure of the heat storage type burner shown in FIG. 1 was filled with the spherical heat storage material. It is a longitudinal cross-sectional view which shows the modification of the thermal storage part structure of the thermal storage type burner which concerns on this invention. It is a partially expanded perspective view which shows a mode that the thermal storage material comprised by the honeycomb-shaped block body was provided in the thermal storage part in the thermal storage part structure of the thermal storage type burner shown in FIG. It is a longitudinal cross-sectional view which shows the other modification of the thermal storage part structure of the thermal storage type burner which concerns on this invention. It is a longitudinal cross-sectional view which shows the other modification of the thermal storage part structure of the thermal storage type burner which concerns on this invention. It is a longitudinal cross-sectional view which shows the other modification of the thermal storage part structure of the thermal storage type burner which concerns on this invention. It is a longitudinal cross-sectional view which shows the other modification of the thermal storage part structure of the thermal storage type burner which concerns on this invention.

  Hereinafter, preferred embodiments of a heat storage section structure of a heat storage burner according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a heat storage unit structure of a heat storage burner according to the present embodiment. The heat storage section structure of the regenerative burner according to this embodiment is provided in the regenerative burner B and is installed in the burner gas passage 1 that communicates the inside and outside of the furnace, and is mixed with fuel and burned in the furnace. Is provided in the heat storage unit 2 in which the combustion air for generating the gas and the exhaust gas discharged from the furnace flow alternately. In the heat storage unit 2, a sphere-shaped heat storage material (hereinafter referred to as a spherical heat storage material) 3 for collecting heat from exhaust gas discharged from the furnace and heating the combustion air with the collected heat is accommodated in a casing 4. Configured.

  As shown in FIG. 1, the heat storage section 2 is filled in a casing 4 that is joined to a connecting pipe section 5 that forms part of the gas passage 1 for the burner B of the heat storage burner B connected to the furnace, and the casing 4 is filled. A large number of the spherical heat storage materials 3 are formed, and a large number of holes are formed, and a heat resistant grating 6 that holds the large number of spherical heat storage materials 3 inside the casing 4 while ensuring gas circulation. A large number of holes of the grating 6 are smaller than the outer dimensions of the spherical heat storage material 3.

  The connecting pipe portion 5 forms the burner gas passage 1 using an amorphous refractory similar to that of a furnace. The connecting pipe portion 5 is provided with a fuel supply port 7 for supplying fuel to the burner gas passage 1 from the outside. The passage forming portion 8 formed of an irregular refractory in the connecting pipe portion 5 is formed to be sufficiently thick to withstand the temperature of the hot exhaust gas discharged from the furnace, and its end portion faces downward. Open. The position of the fuel supply port 7 is an example, and it goes without saying that the fuel supply port 7 may be provided at other positions.

  The casing 4 is formed of a steel plate. The casing 4 is joined to the end portion opened downward of the connecting pipe portion 5. The casing 4 includes a peripheral wall portion 9 and a closed wall portion (bottom portion in the drawing) 10 that closes the lower end thereof.

  The inside of the casing 4 is partitioned up and down by a grating 6 fixed to the peripheral wall portion 9 so as to form a horizontal plane. On the upper side of the grating 6, a heat storage material accommodating portion 11 for accommodating the heat storage material 3 is formed, and on the lower side of the grating 6, a hollow chamber 12 is formed. The grating 6 is disposed at a height position separating a space suitable for the flow of combustion air and exhaust gas from the closed wall portion (bottom portion) 10. The peripheral wall portion 9 that forms the chamber 12 is provided with an intake / exhaust pipe portion 13 that protrudes in the horizontal direction and connects the inside of the chamber 12 and the outside of the casing 4 to constitute the burner gas passage 1.

  A portion of the casing 4 that constitutes the heat storage material accommodating portion 11 is provided with a plurality of protruding walls 14 that protrude from the inner surface 9a of the peripheral wall portion 9 inward of the casing 4 and that are spaced apart from each other in the vertical direction. It is done.

  FIG. 2 is a partially enlarged perspective view showing a state in which the heat storage part 2 is filled with the spherical heat storage material 3. In the present embodiment, four protruding walls 14 are formed. In FIG. 2, two of the protruding walls 14 are shown. As shown in FIG. 2, each projecting wall 14 is formed in an annular shelf shape so as to surround a central region CA inside the peripheral wall portion 9.

  Of the four protruding walls 14, the lowermost protruding wall 14 is brought into contact with the grating 6 from below. The uppermost protruding wall 14 is provided on the upper edge of the peripheral wall portion 9. Between the uppermost protruding wall 14 and the lowermost protruding wall 14, the two protruding walls 14 are arranged at substantially equal intervals. The interval between the protruding walls 14 is set wider than the outer dimension of the spherical heat storage material 3.

  The number of protruding walls 14 is the number including the uppermost protruding wall 14 and the lowermost protruding wall 14. The shape of the protruding wall 14 is not limited to a plate-like shape, and may be any form as long as it plays a similar role.

  The heat storage unit 2 is connected to an end portion of the connecting pipe unit 5 that is open downward from the passage forming unit 8 with an outer peripheral flange 19 in contact with the uppermost protruding wall 14 of the casing 4. . A plurality of spherical heat storage materials 3 are filled and stored on the grating 6 from above in the heat storage material storage portion 11 of the casing 4 connected to the connection pipe portion 5. The heat storage material 3 is uniformly filled from the space between the protruding walls 14 to the central area CA. Since the movement of the filled spherical heat storage material 3 is restricted by the four protruding walls 14, the spherical heat storage material 3 is more reliably held between the protruding walls 14 positioned above and below.

  Combustion air and exhaust gas flowing between the connecting pipe part 5 and the intake / exhaust pipe part 13 include a lower opening 15 formed by the lowermost protruding wall 14 and an upper opening 16 formed by the uppermost protruding wall 14. Circulates in the central area CA in the heat storage material accommodating portion 11 having both ends as shown in the figure (indicated in the gas flow direction). On the other hand, in the outer peripheral area OA formed outside the central area CA and surrounding the central area CA, the pressure is stabilized once the combustion air or exhaust gas enters between the protruding walls 14 adjacent to each other. This hinders the flow of combustion air and exhaust gas in the outer peripheral area OA. For this reason, in the outer peripheral area OA, the combustion air and exhaust gas do not enter between the heat storage material 3 held between the protrusion walls 14 by the protrusion walls 14, that is, the heat storage material 3 near the inner surface 9 a side of the casing 4. For this reason, the heat storage material 3 and the casing 4 in the outer peripheral area OA are not heated to a high temperature. The protruding wall 14 that hinders the flow of combustion air and exhaust gas to the outer peripheral area OA corresponds to a closing member.

  According to the heat storage part structure of the heat storage type burner according to the present embodiment, the combustion wall and the exhaust gas do not circulate in the outer peripheral area OA by the protruding wall 14 provided in the casing 4. The material 3 can function as a heat insulating material. In particular, since the plurality of protruding walls 14 are provided on the inner surface 9a side of the peripheral wall portion 9, the movement of the spherical heat storage material 3 can be restricted, and the distribution of combustion air and exhaust gas in the outer peripheral area OA can be prevented. 4 can suppress the temperature rise near the inner surface 9a side.

  Since the outer peripheral area OA and the casing 4 do not reach a high temperature, the heat storage section 2 can be formed using a steel casing 4 that is lighter and more compact than an amorphous refractory without using an irregular refractory. . That is, when using an irregular refractory, many processes such as mold assembly, refractory pouring, drying, etc. are required and the work is complicated, and the construction time is increased and the work cost increases. According to the heat storage part structure of the heat storage type burner, since refractory is not used, construction is easy, it can be manufactured in a short time and at low cost, and it is compact and installed in a space-saving manner be able to.

  The projecting wall 14 (blocking member) that forms the outer peripheral region OA that prevents the combustion air and exhaust gas from flowing through the spherical heat storage material 3 in the vicinity of the inner surface 9a side of the casing 4 in an arrangement that surrounds the periphery of the central region CA. The configuration of the present embodiment is not disclosed or suggested at all in Patent Documents 1 and 2, and the present embodiment has advantageous effects that cannot be obtained by any of these Patent Documents 1 and 2. Play.

  In addition, since the same spherical heat storage material 3 as the central region CA in which the combustion air and the exhaust gas circulate is filled in the outer peripheral region OA in which the combustion air and the exhaust gas do not circulate, the vicinity of the peripheral wall portion 9 of the casing 4 is insulated. Construction and member management are easy, and costs can be reduced.

  In the said embodiment, although the example using the heat storage material 3 which makes | forms a spherical shape was demonstrated as a heat storage material, it does not restrict to this. A modification is shown in FIGS. 3 and 4. FIG. 3 is a longitudinal sectional view showing a heat storage section using a heat storage material formed of a honeycomb-shaped block body. As shown in FIG. 3, as the heat storage material, a heat storage material (hereinafter referred to as a honeycomb heat storage material) comprising a honeycomb-shaped block body having a large number of through-holes 17a having a honeycomb-like cross section along the direction in which combustion air and exhaust gas circulate. 17) may be used.

  When the honeycomb heat storage material 17 is used, the honeycomb heat storage material 17 may be disposed between the uppermost and lowermost two protruding walls 14 without using the grating 6. FIG. 4 is a view showing a state where the heat storage section 2 includes the honeycomb heat storage material 17. In this case, at the both ends of the honeycomb heat storage material 17 in the direction in which the combustion air and exhaust gas flow (indicated by the gas flow direction), the through holes 17a positioned in the outer peripheral area OA as shown in FIG. Since it is obstruct | occluded by the sheet | seat protrusion wall 14, combustion air and waste gas do not distribute | circulate to the outer periphery area | region OA. For this reason, since the honeycomb heat storage material 17 has a through-hole 17a closed in the vicinity of the inner surface 9a side of the casing 4 to form an air insulation layer, the honeycomb heat storage material 17 and the casing 4 in the outer peripheral region OA are heated to a high temperature. Can be prevented.

  5 and 6 show still another modification. FIG. 5 is a vertical cross-sectional view showing a heat storage unit using a spherical heat storage material and in which combustion air and the like circulate in the horizontal direction. FIG. 6 is a longitudinal sectional view showing a heat storage section using a honeycomb heat storage material and in which combustion air and the like circulate in the horizontal direction.

  In the above embodiment, the case where combustion air and exhaust gas circulate in the vertical direction has been described. However, as shown in FIGS. 5 and 6, the combustion air extends horizontally from the burner gas passage 1 to the intake / exhaust pipe portion 13. And the heat storage part 2 may be horizontally arranged so that the exhaust gas flows. At this time, when the spherical heat storage material 3 is used as the heat storage material, it is desirable to provide the grating 18 also in the opening on the furnace side (right side in the figure).

  The grating 18 installed in the opening on the furnace side is also heat resistant and has a large number of holes smaller than the outer diameter of the spherical heat storage material 3.

  Further, when the spherical heat storage material 3 is used, it is desirable that the spherical heat storage material 3 is filled in the casing 4 that is vertically oriented, and then attached in a horizontal horizontal direction. However, the present invention is not limited to this, and a filling opening that opens upward when the casing 4 is placed horizontally and horizontally is formed, and the spherical heat storage material 3 is dropped into the casing 4 from the filling opening and filled. May be. The fact that this casing 4 can be installed vertically vertically is as described in the above embodiment (see FIG. 1).

  FIG. 7 shows still another modification. FIG. 7 is a longitudinal sectional view of a heat storage section structure of a heat storage burner according to this modification. In this modification, only the uppermost protruding wall 14 and the lowermost protruding wall 14 are provided in the casing 4. Even in such a modification, it is a matter of course that the same operational effects as those of the above-described embodiment can be obtained.

  FIG. 8 shows still another modification. FIG. 8 is a longitudinal sectional view of the heat storage section structure of the heat storage burner according to this modification. In this modification, the casing 4 is not provided with the protruding wall 14 as a closing member.

  Similar to the above embodiment, the casing 4 is provided with an upper opening 16 and a lower opening 15 through which combustion air and exhaust gas flow into the casing 4. In this modified example, a sealing portion for narrowing the diameters of the openings 15 and 16 is provided in a portion around the upper opening 16 and the lower opening 15 of the casing 4.

  In the illustrated example, the blocking portion of the upper opening 16 is formed by joining a passage forming portion 8 having a thickness that forms the gas passage 1 for the burner to a peripheral portion of the upper opening 16 of the casing 4. Specifically, the end 8 a of the passage forming portion 8 having a thickness closes the lip portion of the upper opening 16 of the casing 4 along the circumferential direction, and narrows the diameter of the upper opening 16. On the other hand, the blocking portion of the lower opening 15 closes the lip portion of the lower opening 15 of the casing 4 along the circumferential direction at the upper end position of the grating 6 positioned below the casing 4 to narrow the diameter of the lower opening 15. An annular lid 20 is formed.

  These blocking portions play the same role as the protruding walls of the above embodiment. That is, the passage forming portion 8 and the lid 20 as the sealing portion are arranged in the casing 4 so as to form a central region CA in which combustion air and exhaust gas circulate in the spherical heat storage material 3 and surround the periphery of the central region CA. An outer peripheral area OA that prevents the combustion air and exhaust gas from flowing through the spherical heat storage material 3 near the inner surface side of the casing 4 is formed.

  Even in such a modification, since the combustion air and the exhaust gas do not circulate in the outer peripheral area OA, the heat storage material 3 filled between the end 8a of the passage forming portion 8 and the annular lid 20 is used as the heat insulating material. And the same effects as those of the above embodiment can be obtained. In this modification, since it is not necessary to provide a protruding wall in the casing 4, it is easier to construct than the above embodiment, can be manufactured in a short time and at a low cost, and has a compact form. It can be installed in a small space.

  Of course, the modified examples shown in FIGS. 7 and 8 can be applied to the honeycomb heat storage material 17.

DESCRIPTION OF SYMBOLS 1 Gas path for burners 2 Heat storage part 3 Spherical heat storage material 4 Casing 5 Connection pipe part 6 Grating 7 Fuel supply port 8 Passage formation part 8a End part (blocking part) of passage formation part
9 peripheral wall portion 9a inner surface of peripheral wall portion 10 closed wall portion (bottom)
DESCRIPTION OF SYMBOLS 11 Heat storage material accommodating part 12 Chamber 13 Intake / exhaust pipe part 14 Projection wall (blocking member)
DESCRIPTION OF SYMBOLS 15 Lower opening 16 Upper opening 17 Heat storage material which consists of a honeycomb-shaped block body 17a Through-hole 18 Grating 19 Outer peripheral flange 20 Lid (blocking part)
B Thermal storage burner CA Central area OA Outer peripheral area

Claims (1)

In the heat storage part structure of a regenerative burner provided with a casing containing a heat storage material that collects heat from the exhaust gas and heats the combustion air with the recovered heat in a gas passage for the burner in which combustion air and exhaust gas circulate alternately ,
The casing is formed with a central region in which combustion air and exhaust gas circulate in the heat storage material, and combustion air and exhaust gas are disposed on the heat storage material in the vicinity of the inner surface side of the casing in an arrangement surrounding the periphery of the central region. Providing a blocking member that forms an outer peripheral region that prevents circulation ,
The heat storage material is a large number of spheres filled in the casing,
The closing member is a plurality of annular shaped projecting walls projecting from the inner surface of the casing to the inside of the casing, and the projecting walls at both ends of the casing communicate with the gas passage for the burner. And the protruding walls are spaced apart from each other at an interval wider than the outer dimension of the sphere so as to restrict the movement of the sphere and hold it in the outer peripheral area between the openings at both ends of the casing. A heat storage structure of a heat storage burner that is characterized.

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