JP5786358B2 - Top combustion hot stove - Google Patents

Description

  The present invention relates to a top combustion hot stove.

A hot stove is known as equipment for constantly sending hot air (hot air) to a blast furnace stably. As such a hot stove, conventionally, two types, an external combustion type (two-cylinder type) and an internal combustion type (single-cylinder type internal division type), are used according to the capacity of the blast furnace.
An external combustion type hot stove has a structure in which a combustion cylinder and a heat storage cylinder are connected to each other at the top of the furnace (see, for example, Patent Document 1). However, in such an external combustion type hot stove, although high-temperature air blowing is possible, since it is a two-cylinder type, the quantity is large compared to the internal combustion type, and the equipment tends to be large. In addition, since the internal temperature is different between the combustion part and the heat storage part, there is a possibility that a difference in thermal expansion occurs at the furnace top connection part and the internal refractory is damaged.

  An internal combustion type hot stove has a structure in which one steel cylinder is divided into two chambers by a refractory partition wall to form a combustion part and a heat storage part (see, for example, Patent Document 2). However, in such an internal combustion type hot stove, it is difficult to blow high-temperature air or increase the capacity (enlargement) compared to the external combustion type. In addition, the partition wall may be damaged by a temperature difference between the combustion part and the heat storage part.

  Therefore, in recent years, a top-combustion type single-cylinder hot air furnace has been proposed as a technique for solving the problems of these external combustion type internal combustion type hot air furnaces and internal combustion type hot air furnaces. For example, see Patent Document 3). This hot stove is an internal combustion type that performs combustion and heat storage in a single container (cylinder). A burner is installed at the top to cause combustion, and can be enlarged. In addition, there is an advantage that high temperature ventilation is possible.

JP-A-53-131906 JP 52-141404 A International Publication No. 2009/008758 Pamphlet

However, the top combustion type single-cylinder hot air furnace described in Patent Document 3 is very difficult to design, manufacture, and install because the structure of the channel of the burner section is complicated. Furthermore, in the hot stove of Patent Document 3, the pressure loss of the supplied fuel gas and combustion air is very large.
In addition, even in other top-combustion type single-cylinder hot air furnaces, no satisfactory products are provided in terms of combustion state and life.

  The present invention has been made in view of the above circumstances, and an object thereof is a top combustion type hot stove having a simple configuration and capable of reducing the pressure loss of the supplied fuel gas and combustion air. Is to provide.

The top combustion type hot stove of the present invention comprises a covered cylindrical mixing portion having a mixing chamber also serving as a burner portion inside, and a heat storage chamber arranged below the mixing chamber and communicating with the mixing chamber,
One of a fuel supply pipe for blowing fuel gas into the mixing chamber and an air supply pipe for blowing combustion air from the side of the mixing section By blowing fuel gas or combustion air into the mixing chamber, it is connected to form a swirling flow in the mixing chamber,
The other of the fuel supply pipe and the air supply pipe is connected to the canopy portion of the mixing unit so as to blow fuel gas or combustion air from above the mixing chamber toward the swirling flow. It is characterized by being.

  According to this top combustion type hot stove, one of the fuel gas and the combustion air is blown into the mixing chamber to form a swirling flow, and the other of the fuel gas and the combustion air is blown into the swirling flow. Therefore, combustion occurs favorably, and a uniform temperature distribution can be obtained in the combustion region. In particular, the structure of the mixing chamber that also serves as the burner unit has a simple configuration in which the fuel supply pipe and the air supply pipe are simply connected so that fuel gas or combustion air is blown into the mixing chamber. This is advantageous in terms of production. In addition, since one of the fuel supply pipe and the air supply pipe is connected to the side periphery of the mixing section and the other is connected to the canopy section, these pipes are directly connected to the mixing section. Further, if these pipes are provided, for example, one by one, the structure is simplified and the pipe diameter is increased, so that the pressure loss of the supplied fuel gas and combustion air is sufficiently reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the top combustion type hot stove which consists of simple structure and also made it possible to reduce the pressure loss of the fuel gas and combustion air to supply can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the top combustion type hot stove of this invention, (a) is the side view seen partially, (b) is a top view. (A) is principal part sectional drawing of a mixing part, (b) is an expanded sectional view for demonstrating a through-hole. It is a figure which shows 2nd Embodiment of the top combustion type hot stove of this invention, (a) is principal part sectional drawing, (b) is a top view. It is a figure which shows 3rd Embodiment of the top combustion type hot stove of this invention, (a) is principal part sectional drawing, (b) is a top view.

  Hereinafter, the top combustion type hot stove of this embodiment will be described in detail with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

  As shown in FIG. 1 (a), the top combustion hot stove 1 is a closed-bottomed cylindrical hot stove, and particularly has a lid-like cylindrical mixing section 2 at the top (upper part). A bottomed cylindrical heat storage section 3 is provided below the section 2. The heat storage unit 3 is connected to the mixing unit 2 via the contraction unit 4 and the throat unit 5. In addition, when this top combustion type hot stove 1 is divided roughly into an external combustion type (2 cylinder type) and an internal combustion type (single cylinder type), it is classified into an internal combustion type.

  The mixing part 2 has a dome-shaped canopy part 2a, a cylindrical part 2b provided below the dome-shaped canopy part 2a, and a reduced diameter that extends inward (center side) from the bottom of the cylindrical part 2b to reduce the lower opening of the cylindrical part 2b. And a mixing chamber 6 formed therein. As shown in FIG. 2 (a), the mixing portion 2 is provided with a refractory layer 7 made of a refractory material such as brick, surrounding the mixing chamber 6, between the outer wall and the mixing chamber 6. Further, in the present embodiment, the first ceiling portion 8 and the second ceiling portion 9 made of a refractory material such as bricks are stacked in the vertical direction through the space portion 10, particularly on the canopy portion 2 a side of the mixing portion 2. Has been.

  The 1st ceiling part 8 comprises a part of said refractory material layer 7, and is provided inside the outer wall which forms the canopy part 2a. In the first ceiling portion 8, a vent hole 11 communicating with the air supply pipe 13 is formed at a connection position of the air supply pipe 13 described later. Although the air hole 11 is not particularly limited, the air hole 11 is formed to have an inner diameter that is substantially the same as the inner diameter of the air supply pipe 13, so that almost no pressure loss occurs between the air supply pipe 13 and the air hole 11. It is like that.

  The second ceiling portion 9 is disposed below the first ceiling portion 8, and is formed at a substantially boundary portion between the canopy portion 2a and the cylindrical portion 2b. The second ceiling portion 9 is formed by refractory bricks assembled in a dome shape to have a thickness of about 200 mm to 300 mm, and has a large number of through holes 12 penetrating up and down the second ceiling portion 9. Is. With such a configuration, the through-hole 12 allows the inside of the space portion 10 and the inside of the mixing chamber 6 below the second ceiling portion 9 to communicate with each other.

  Further, as shown in FIG. 2B, these through holes 12 are tapered holes having a large diameter on the space 10 side and a small diameter on the mixing chamber 6 side. Specifically, the inner diameter on the large diameter side is about 50 mm, and the inner diameter on the small diameter side is about 30 mm. Although these through-holes 12 differ depending on the size of the top combustion type hot stove 1, in the present embodiment, about several hundred to several thousand are formed and arranged almost uniformly. Therefore, when the combustion air supplied from the air supply pipe 13 flows into the mixing chamber 6 through the second ceiling portion 9 as will be described later, it is dispersed and flows in a shower shape. .

  As shown in FIGS. 1 (a), 1 (b), and 2 (b), an air supply pipe 13 is connected to the canopy 2a of the mixing section 2, and the cylindrical section 2b, that is, the side periphery of the mixing section 2 is used. A fuel supply pipe 14 is connected to the section. The air supply pipe 13 is connected to the center of the canopy 2a, that is, the outermost wall at the top, substantially downward in the vertical direction, communicates with the vent hole 11, and is connected to an air supply source (not shown). Then, the combustion air is configured to be supplied into the mixing chamber 6.

  The fuel supply pipe 14 extends from the outer wall surface of the cylindrical portion 2b to the inner surface of the mixing chamber 6 through the refractory layer 7, and opens to the inner surface. The gas is supplied into the mixing chamber 6. Note that the supply pressure on the fuel supply source side of the fuel gas supplied into the mixing chamber 6 by the fuel supply pipe 14 is determined by the specifications of the blast furnace plant to which the top combustion hot stove 1 of the present embodiment is applied. ing. Therefore, the pressure loss particularly in the fuel supply pipe 14 greatly affects the flow rate of the fuel gas supplied into the mixing chamber 6. That is, in order to supply a sufficient and stable flow rate of fuel gas into the mixing chamber 6, it is important to reduce the pressure loss in the entire fuel gas supply system, particularly the pressure loss in the fuel supply pipe 14. ing.

  Therefore, in the present embodiment, only one fuel supply pipe 14 is directly connected to the cylindrical portion 2 b and is opened through the refractory layer 7 to the inner surface of the mixing chamber 6. Therefore, the configuration is simplified, and the pipe diameter can be adjusted to, for example, about 700 mm to about 1700 mm according to the capacity of the hot stove 1. Therefore, the pressure loss in the fuel supply pipe 14 is sufficiently suppressed, and the pressure loss is significantly reduced as compared with the conventional hot stove, particularly the hot stove of Patent Document 3 in which the structure of the channel of the burner portion is complicated. It has been made.

  Further, the fuel supply pipe 14 is arranged so as to blow fuel gas along the inner surface of the mixing chamber 6 as shown in FIG. That is, the fuel supply pipe 14 is arranged so that the central axis thereof is parallel to the tangential direction of the inner surface (inner peripheral surface) of the mixing chamber 6 at the position of the outermost end 14b of the opening 14a. Accordingly, the fuel gas blowing direction by the fuel supply pipe 14 is parallel to the tangential direction of the inner surface (inner peripheral surface) of the mixing chamber 6 at the position of the outermost end 14b, and along the inner surface. It comes to blow. Under such a configuration, the fuel supply pipe 14 blows the fuel gas into the mixing chamber 6 so that the swirling flow of the fuel gas into the mixing chamber 6 as shown by an arrow in FIG. Is supposed to form.

  Under such a configuration, the combustion air supplied from the air supply pipe 13 spreads radially by flowing into the space portion 10 through the vent hole 11 of the first ceiling portion 8, and It flows into the mixing chamber 6 through the through-hole 12 of the second ceiling portion 9 and blows into the swirling flow. At that time, the combustion air flows in a shower-like manner as described above, so that it is better and uniformly mixed with the fuel gas forming the swirl flow.

  Note that the pressure loss in the air supply pipe 13 is also required to be smaller than the pressure loss in the fuel supply pipe 14. Therefore, in the present embodiment, since only one of the air supply pipes 13 is directly connected to the canopy 2a, the configuration is simplified, and the pipe diameter is the same as that of the fuel supply pipe 14. For example, the size can be about 700 mm to about 1700 mm. Therefore, the pressure loss in the air supply pipe 13 is sufficiently suppressed, and the pressure loss is significantly reduced as compared with the conventional hot stove, particularly the hot stove of Patent Document 3 in which the structure of the channel of the burner portion is complicated. It has been made.

  The mixing unit 2 having such a configuration is configured such that the inside of the mixing chamber 6 functions as a burner unit. That is, since the top combustion type hot stove 1 of this embodiment is always heated to about 1400 ° C. to 1500 ° C., the fuel gas and the combustion air are supplied into the mixing chamber 6, and these have a predetermined mixing degree. When mixed, it will ignite spontaneously. That is, combustion occurs from slightly below the opening 14a of the fuel supply pipe 14 to the contracted flow portion 4 and the throat portion 5 described later. The ratio of the fuel gas supply amount (supply flow rate) from the fuel supply piping 14 and the combustion air supply amount (supply flow rate) from the air supply piping 13 is not particularly limited. For example, it is set to be approximately 1: 1.

  The contracted flow part 4 is a cylindrical part connected to the reduced diameter part 2 c of the mixing part 2, and has a contracted flow path 4 a communicating with the mixing chamber 6 therein. The throat portion 5 is in the shape of a truncated cone connected to the contracted flow portion 4, and has an enlarged diameter path 5a communicating with the contracted flow path 4a. With such a configuration, the contracted flow path 4a and the expanded diameter path 5a are reduced in diameter once after the inner diameter of the mixing chamber 6 is increased, thereby increasing the degree of mixing of the fuel gas and the combustion air, and by combustion. The influence of thermal expansion is suppressed, and the combustion gas is lowered at a uniform flow rate.

  The heat storage part 3 is a cylindrical thing connected to the throat part 5, forms the heat storage chamber 3a inside, further connects the hot air supply pipe 15 to the upper part (throat part 5 side), and the flue pipe 16 to the bottom part. Connected. In the heat storage chamber 3a, a heat storage brick 18 is laminated on a heat storage brick receiving material 17 provided at the bottom thereof, and heat generated by combustion on the mixing chamber 6 side is accumulated in the heat storage brick 18. It has come to be. The hot air supply pipe 15 is connected to the blast furnace side, and supplies hot air having heat accumulated in the heat storage brick 18 to the blast furnace side as will be described later.

  The flue pipe 16 is disposed on the side of the heat storage brick receiver 17, has a flue valve 19, and is further connected to an exhaust duct (not shown). The flue pipe 16 is provided with a blower pipe 20 branched from the flue valve 19 to the heat storage section 3 side. The blower pipe 20 is provided with a blower valve 21 and a blower (not shown).

  In the top combustion type hot stove 1 having such a configuration, first, at the time of combustion operation, with the blower valve 21 closed and the flue valve 19 opened, the fuel gas is supplied from the fuel supply pipe 14 as described above. The combustion air is supplied to the mixing chamber 6 from the air supply pipe 13. Then, the fuel gas forms a swirl flow, and combustion air is blown into the swirl flow, so that the fuel gas and the combustion air are mixed with each other and further mixed with each other while forming a swirl flow. Burn. Further, such combustion occurs while a mixed gas of fuel gas and combustion air flows toward the heat storage section 3, so that the combustion gas contacts the heat storage brick 18 in the heat storage chamber 3 a and exchanges heat. Therefore, the heat storage brick 18 accumulates heat obtained by heat exchange with the combustion gas. Further, the combustion gas (exhaust gas) after the heat exchange is guided to the exhaust duct through the flue pipe 16.

  After performing heat storage on the heat storage brick 18 in this way, the blower is operated with the blower valve 21 opened and the flue valve 19 closed at the time of the blowing operation for sending hot air to the blast furnace side. Then, the air flowing into the heat storage chamber 3a from the blower pipe 20 through the flue pipe 16 receives heat accumulated in the heat storage brick 18 by exchanging heat with the heat storage brick 18, and becomes hot air to supply hot air. It is discharged from the pipe 15 and supplied to the blast furnace side.

Here, during the combustion operation, the combustion air introduced into the space portion 10 through the first ceiling portion 8 exchanges heat with the first ceiling portion 8 by temporarily staying in the space portion 10. The first ceiling portion 8 is cooled.
Further, during the air blowing operation, part of the hot air after heat exchange with the heat storage brick 18 flows into the mixing chamber 6. Then, the 2nd ceiling part 9 receives radiant heat and accumulates heat. Accordingly, when the combustion operation is performed again after the air blowing operation, the combustion air exchanges heat with the second ceiling portion 9 when it passes through the second ceiling portion 9.

  In such an operation, at the time of the combustion operation, fuel gas is blown into the mixing chamber 6 to form a swirl flow, and combustion air is blown into the swirl flow, so that combustion occurs favorably. . Accordingly, a uniform temperature distribution can be obtained in the combustion region formed from the vicinity of the opening 14a of the fuel supply pipe 14 in the mixing chamber 6 to the contracted flow path 4a side of the expanded diameter path 5a.

  Therefore, in the top combustion type hot stove 1 of the present embodiment, since a uniform temperature distribution is obtained in the combustion region, the internal refractory is prevented from being damaged by a temperature difference or a thermal expansion difference, and is durable. Can be improved. Accordingly, in a hot stove that is normally operated for 20 years or longer without refurbishment or the like, durability is improved, which is extremely advantageous in terms of maintenance and cost.

  In addition, the structure of the mixing chamber 6 that functions as a burner portion, and thus also serves as a burner portion, is connected to the fuel supply pipe 14 to the mixing portion 2 so as to blow fuel gas into the mixing chamber 6 and blows combustion air. As described above, since the air supply pipe 13 is simply connected, it is advantageous in terms of design and manufacturing, and it is possible to extend the life and improve the maintainability and reduce the manufacturing cost. Can also be planned.

  Further, the fuel supply pipe 14 is connected to the side periphery of the mixing section 2, the air supply pipe 13 is directly connected to the canopy section 2a, and these pipes 13 and 14 are provided one by one, so the structure is simple. By increasing the pipe diameter, the pressure loss of the supplied fuel gas and combustion air can be sufficiently reduced. Therefore, in particular, the swirl flow formed by the fuel gas can be made stronger, thereby increasing the mixing efficiency and further increasing the combustion efficiency.

  Moreover, since the 1st ceiling part 8 and the 2nd ceiling part 9 are laminated | stacked up and down via the space part 10 at the canopy part 2a side of the mixing part 2, the through-hole of the 2nd ceiling part 9 Combustion air can be dispersed and flowed into the mixing chamber 6 in the form of a shower through the mixing chamber 6, so that the fuel gas forming the swirling flow can be better and uniformly mixed.

In addition, the first ceiling portion 8 can be cooled during the combustion operation, thereby reducing the thermal fatigue of the dome-shaped canopy portion that is structurally weakened and improving the durability.
In addition, heat exchange occurs between the combustion air and the second ceiling portion 9 during the combustion operation due to radiation to the second ceiling portion 9 during the air blowing operation, thereby improving the thermal efficiency and increasing the inside of the mixing chamber 6. The combustion efficiency can be increased.

  Further, since the through hole 12 is a tapered hole having a small diameter on the mixing chamber 6 side and a large diameter on the space portion 10 side, the combustion air from the space portion 10 side to the mixing chamber 6 side during the combustion operation. The pressure loss during the inflow of is reduced. On the other hand, since the through hole 12 is the tapered hole during the air blowing operation, the pressure loss when the hot air flows back from the mixing chamber 6 side to the space portion 10 side becomes relatively high. Therefore, the backflow of hot air from the mixing chamber 6 side to the space part 10 side is suppressed.

  In addition, since the fuel supply pipe 14 is connected to the side periphery of the mixing section 2 and the air supply pipe 13 is connected to the canopy section 2a of the mixing section 2, the supply pressure is particularly limited for fuel gas. The pressure loss on the fuel supply pipe 14 side can be kept low. That is, by forming two layers of the ceiling part on the canopy part 2a side, the pressure loss is higher in the supply from the canopy part 2a than in the supply from the side peripheral part. As described above, the pressure loss can be kept low.

  Then, with reference to FIG. 3, the top combustion type hot stove 30 which concerns on 2nd Embodiment is demonstrated. The top combustion type hot stove 30 is mainly different from the top combustion type hot stove 1 shown in FIGS. 1 (a) and 1 (b) in that an air supply connected to the canopy 2a as shown in FIG. 3 (a). This is a point in which a plurality of pipes 13 are provided. That is, in this embodiment, as shown in FIG. 3 (b), four air supply pipes 13 are arranged at equal intervals in the circumferential direction on the outer peripheral part of the canopy part 2a (near the inner wall of the cylindrical part 2b in plan view). It is arranged.

  Further, in this embodiment, unlike the first embodiment, the second ceiling portion 9 in the mixing portion 2 shown in FIG. 2A is not provided, and the first ceiling portion 8, that is, a refractory material. It consists only of layer 7. Therefore, the combustion air supplied from the four air supply pipes 13 flows into the mixing chamber 6 through the vent holes 11 communicating with the air supply pipes 13 and is supplied from the fuel supply pipe 14. The swirl flow formed by the fuel gas is blown from the top to the bottom.

Even in the top combustion type hot stove 30 having such a configuration, combustion air is blown into the swirl flow formed by the fuel gas, so that combustion occurs satisfactorily and a uniform temperature distribution is obtained in the combustion region. be able to. Therefore, it is possible to suppress the internal refractory from being damaged by a temperature difference or a thermal expansion difference, and to improve durability.
In addition, since the structure of the mixing chamber 6 that also serves as the burner is simplified, it is advantageous in terms of design and production, and it is possible to extend the life and improve the maintainability, and to reduce the manufacturing cost. You can also plan.
In addition, the pressure loss of the supplied fuel gas and combustion air can be reduced, so that the swirl flow formed by the fuel gas can be made stronger, thereby increasing the mixing efficiency and further increasing the combustion efficiency. Can be achieved.

  Then, with reference to FIG. 4, the top combustion type hot stove 40 which concerns on 3rd Embodiment is demonstrated. The top combustion type hot stove 40 differs from the top combustion type hot stove 30 shown in FIGS. 3 (a) and 3 (b) mainly in the fuel supply connected to the cylindrical part 2b as shown in FIG. 3 (a). A plurality of piping 14 is provided. That is, in the present embodiment, as shown in FIG. 4B, four fuel supply pipes 14 are arranged at equal intervals in the circumferential direction on the outer wall portion of the cylindrical portion 2b (side peripheral portion of the mixing portion 2). doing.

These four fuel supply pipes 14 are arranged so as to blow fuel gas along the inner surface of the mixing chamber 6 in the same manner as the fuel supply pipe 14 shown in FIG.
In the present embodiment as well, as in the second embodiment, the second ceiling portion 9 in the mixing portion 2 shown in FIG. 2A is not provided, but the first ceiling portion 8, that is, It consists only of the refractory layer 7.

  In the present embodiment, as in the second embodiment, four air supply pipes 13 are provided, and the air supply pipes 13 and the fuel supply pipes 14 are arranged corresponding to each other. ing. That is, each air supply pipe 13 is arranged in front of the opening of the corresponding fuel supply pipe 14, that is, on the blowing direction side. As a result, the combustion air supplied from each air supply pipe 13 is blown into the swirl flow formed by the fuel gas supplied from the corresponding fuel supply pipe 14.

Even in the top combustion type hot stove 40 having such a configuration, combustion air is blown into the swirl flow formed by the fuel gas, so that combustion occurs satisfactorily and a uniform temperature distribution is obtained in the combustion region. be able to. Therefore, it is possible to suppress the internal refractory from being damaged by a temperature difference or a thermal expansion difference, and to improve durability.
In addition, since the structure of the mixing chamber 6 that also serves as the burner is simplified, it is advantageous in terms of design and production, and it is possible to extend the life and improve the maintainability, and to reduce the manufacturing cost. You can also plan.
Further, by reducing the pressure loss of the supplied fuel gas and combustion air, it is possible to increase the mixing efficiency and further increase the efficiency of combustion.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the second embodiment and the third embodiment, the refractory layer 7 on the side of the canopy 2a is formed only by the first ceiling portion 8 without providing the second ceiling portion 9. In the embodiment and the third embodiment, similarly to the first embodiment, the first ceiling portion 8 and the second ceiling portion 9 may be stacked via the space portion 10.

Further, in this case, the through holes 12 formed in the second ceiling portion 9 are not formed almost uniformly over the entire area of the second ceiling portion 9 and are formed and arranged only in the blowing direction of the air supply pipe 13. You may make it do. That is, it is preferable that the through hole 12 is formed at a position where the opening at the lower end of the air supply pipe 13 faces the second ceiling portion 9. In this way, the air blown from the air supply pipe 13 can easily reach the swirl flow directly.
Moreover, in the said embodiment, although the fuel supply piping 14 was connected to the side periphery of the mixing part 2, and the air supply piping 13 was connected to the canopy 2a, conversely, the fuel supply piping 14 was connected to the canopy 2a. The air supply pipe 13 may be connected to the side periphery of the mixing unit 2.

  Further, the air supply pipe 13 (pipe connected to the canopy part 2a) in the second embodiment, the air supply pipe 13 (pipe connected to the canopy part 2a) and the fuel supply pipe 14 in the third embodiment. About the number of (piping connected to the side peripheral part of the mixing part 2), arbitrary numbers are employable, without being limited to four.

DESCRIPTION OF SYMBOLS 1, 30, 40 ... Top combustion type hot stove, 2 ... Mixing part, 2a ... Canopy part, 2b ... Cylindrical part, 3 ... Heat storage part, 3a ... Thermal storage room, 6 ... Mixing room, 7 ... Refractory layer, 8 ... 1st ceiling part, 9 ... 2nd ceiling part, 10 ... Space part, 12 ... Through hole, 13 ... Air supply pipe, 14 ... Fuel supply pipe

Claims (2)

A covered cylindrical mixing section having a mixing chamber also serving as a burner section inside, and a heat storage chamber arranged below the mixing chamber and communicating with the mixing chamber,
One of a fuel supply pipe for blowing fuel gas into the mixing chamber and an air supply pipe for blowing combustion air from the side of the mixing section By blowing fuel gas or combustion air into the mixing chamber, it is connected to form a swirling flow in the mixing chamber,
The other of the fuel supply pipe and the air supply pipe is connected to the canopy portion of the mixing unit so as to blow fuel gas or combustion air from above the mixing chamber toward the swirling flow. It is,
A canopy portion of the mixing portion is formed in a dome shape, and a first ceiling portion and a second ceiling portion made of a refractory are vertically arranged through the space portion on the canopy portion side of the mixing portion. A plurality of through holes communicating with the mixing chamber are provided in the second ceiling portion,
The top combustion hot stove characterized in that the through hole is a tapered hole having a small diameter on the mixing chamber side and a large diameter on the space side . The top combustion hot stove according to claim 1 , wherein a fuel supply pipe is connected to a side peripheral portion of the mixing section, and an air supply pipe is connected to the canopy section of the mixing section .

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