JP7311482B2 - Regenerative burner, replacement unit for regenerative burner, and replacement method for replacement unit for regenerative burner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a regenerative burner capable of lowering the temperature of exhaust gas flowing into an exhaust valve with a simple and inexpensive structure, a replacement unit for the regenerative burner, and a method for replacing the replacement unit for the regenerative burner.

Conventionally, Patent Documents 1 to 4, for example, are known as techniques for lowering the temperature of exhaust gas from a regenerative burner. The "combustion device" of Patent Document 1 is configured such that a burner and an exhaust blower are connected in an exhaust gas flow path, and exhaust gas from the burner is discharged to the outside by the operation of the exhaust blower. A heat storage device is provided.

The "regenerative burners" of Patent Documents 2 and 3 are installed in plurality toward the inside of the furnace where the exhaust gas containing the SO2 component is generated. is supplied, and a burner that discharges the exhaust gas to the exhaust path during the suction operation, and the fuel supply path, the air supply path, and the exhaust path are provided corresponding to each burner, and the burner performs the combustion operation and the suction operation. A switching valve for fuel, a switching valve for air supply, and a switching valve for exhaust that are opened and closed for switching are provided. In a regenerative burner in which all switching valves and exhaust switching valves are closed and in a stopped state, Patent Document 2 discloses a fluid filling method for filling a fluid in the exhaust path between each burner and its exhaust switching valve. In Patent Document 3, a configuration in which a fluid introduction path for introducing a dilution fluid is connected to the exhaust path downstream of each exhaust switching valve, and a configuration in which a fluid introduction path for introducing a dilution fluid is connected to the exhaust path downstream of each exhaust switching valve A fluid introduction path for introducing a dilution fluid is connected to the exhaust path.

Patent Document 4, "Method for Preventing Metal Deposition in Regenerative Alternating Combustion Furnace", includes a pair of burners each provided with a heat storage chamber filled with a heat storage medium, and an air supply blower and an exhaust blower connected to each burner via a four-way valve. In a regenerative alternating combustion furnace in which the four-way valve is switched at regular time intervals so that exhaust heat is recovered in the heat storage chamber of one burner while the other burner is burning, the switching cycle of the four-way valve is set periodically. Alternatively, it is configured to provide a long cycle period that is switched at an arbitrary time and made longer than the normal cycle. At this time, in order to prevent the four-way valve from burning out during the long cycle period, the electric valve is opened to introduce outside air from the cooling air suction port.

In the "non-ferrous metal melting furnace" of Patent Document 5, a self-regenerative burner is attached to one side wall of a melting chamber, and a molten metal outlet leading to a holding chamber is provided at the lower end of the other side wall. In an aluminum melting furnace in which a flow gradient is formed in a hearth, the hearth is provided with a plurality of concave grooves along the flow direction. At this time, in order to absorb pressure fluctuations due to alternating combustion, a small hole drilled in one corner of the ceiling of the melting chamber is covered with a lid that can be opened and closed by a hinge. A balance weight is screwed to the protruding screw rod so as to be positionally adjustable, and by adjusting the position of the balance weight, the cover can be opened and closed with a slight force.

JP 2009-243854 A Japanese Patent No. 3973494 Japanese Patent No. 3898094 Japanese Patent No. 3711191 JP-A-2000-146447

Since the exhaust gas from the regenerative burner has a high temperature, if it exceeds the heat-resistant temperature of the exhaust valve, troubles such as the exhaust valve being damaged or the exhaust leaking occur.

In Patent Documents 1 to 3, it was not possible to protect the exhaust valve. In Patent Document 4, an electric valve is controlled, and the device is complicated and costly. The opening and closing of the lid of Patent Document 5 utilizes the weight of the lid itself, and the operation against pressure fluctuations in the chamber is unstable.

The present invention has been devised in view of the above-mentioned conventional problems, and is a regenerative burner that is capable of lowering the temperature of exhaust gas flowing into an exhaust valve with a simple and inexpensive structure, a regenerative burner replacement unit, and a regenerative burner. An object of the present invention is to provide a replacement method for a replacement unit of a burner.

A regenerative burner according to the present invention includes an exhaust valve that is opened when exhaust gas is discharged, a heat storage unit that stores heat from the discharged exhaust gas, and is provided between the heat storage unit and the exhaust valve so that the exhaust gas flows. a communicating hole provided in the chamber for communicating the inside and outside of the chamber; and a communicating hole provided to be closable, and the communicating hole is opened when the inside of the chamber becomes negative pressure. characterized by comprising a damper for

The damper includes a closing plate that is rotatably provided and that can be displaced between a closed state that closes the communication hole and an open state that opens the communication hole, and an opening that assists the displacement of the closing plate to the open state. and an assist mechanism.

The damper includes a closing plate that is rotatably provided and that can be displaced between a closed state that closes the communicating hole and an open state that opens the communicating hole, and a closing plate that assists the displacement of the closing plate to the closed state. and an assist mechanism.

The chamber has an inspection opening closed by a removable cover instead of the communication hole, and the damper has a communication hole that communicates the inside and outside of the chamber, and replaces the cover. is provided in a replacement unit attached so as to block the inspection opening.

A regenerative burner replacement unit according to the present invention includes an exhaust valve that is opened when exhaust gas is discharged, a heat storage unit that stores heat from the discharged exhaust gas, and is provided between the heat storage unit and the exhaust valve, A regenerative burner having a chamber through which exhaust gas flows and an inspection opening provided in the chamber and closed by a removable lid, wherein the inspection opening is closed by replacing the lid. and a damper capable of closing a communicating hole provided to communicate the inside and outside of the chamber and opening the communicating hole when the inside of the chamber becomes negative pressure.

A method for replacing a replacement unit for a regenerative burner according to the present invention is a method for replacing a replacement unit for a regenerative burner, wherein the cover is removed from the chamber to open the inspection opening, and then the replacement unit is replaced by: It is attached to the chamber so as to close the access opening.

In the regenerative burner, the replacement unit for the regenerative burner, and the method for replacing the replacement unit for the regenerative burner according to the present invention, the temperature of the exhaust gas flowing into the exhaust valve can be lowered with a simple and inexpensive structure. can be protected.

1 is a schematic sectional side view showing a preferred embodiment of a regenerative burner according to the present invention; FIG. In FIG. 1, it is a cross-sectional view taken along the line AA. FIG. 3A is an explanatory diagram for explaining a modification of the damper applicable to the regenerative burner shown in FIG. 1, in which FIG. When provided, FIG. 3C shows a case where both the opening assist mechanism and the closing assist mechanism are provided. It is a view taken along line BB in FIG. 3(a). FIG. 5B is an explanatory diagram for explaining another modification of the damper applicable to the regenerative burner shown in FIG. 1, in which FIG. When the mechanism is provided, FIG. 5C shows the case where both the opening assist mechanism and the closing assist mechanism are provided. FIG. 2 is a schematic side view of a main part for explaining a replacement unit for a regenerative burner and a method for replacing the replacement unit for a regenerative burner according to the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a regenerative burner, a regenerative burner replacement unit, and a regenerative burner replacement unit replacement method according to the present invention will be described below in detail with reference to the accompanying drawings.

The regenerative burner 1 includes at least one set of two burner units 2 for ejecting flame from the crater 1a into the furnace and for sucking exhaust gas from the furnace from the crater 1a ( FIG. 1 shows one burner unit 2).

To the burner unit 2, as shown in FIG. 1, an air supply path 3 for supplying combustion air and an exhaust path 4 for discharging exhaust gas from the furnace are connected via a confluence path 5. ing.

Each burner unit 2 is connected to a fuel supply path 7 for supplying fuel gas to a fuel nozzle 6 provided therein.

In the air supply path 3, on the upstream side in the flow direction of the combustion air, an air supply valve 8 that can be freely opened and closed for opening and closing the air supply path 3, An air supply blower 9 is provided for pumping air to each burner unit 2 .

The exhaust path 4 is provided with an openable/closable exhaust valve 10 for opening and closing the exhaust path 4 and an exhaust blower 11 for sucking the exhaust gas from the furnace through the exhaust path 4 on the downstream side in the flow direction of the exhaust gas. .

An air supply branch 25 is provided in the air supply path 3 between the air supply valve 8 and the air supply blower 9, and an exhaust branch 26 is provided in the exhaust path 4 between the exhaust valve 10 and the exhaust blower 11. is provided, and a set of another burner unit (not shown) of the same construction is provided.

During the operation of the regenerative burner 1, the air supply blower 9 and the exhaust blower 11 are always operated, and when exhaust gas is sucked and discharged, the exhaust valve 10 is opened and the air supply valve 8 is closed. When generating a flame, the air supply valve 8 is opened and the exhaust valve 10 is closed.

Further, the fuel supply path 7 is provided with an openable/closable fuel supply valve 12 that opens and closes the fuel supply path 7 upstream of the fuel nozzle 6 in the flow direction of the fuel gas.

The fuel supply valve 12 is opened when flame is generated and closed when exhaust gas is sucked and discharged.

Each burner unit 2 is disposed between the crater 1a and the confluence path 5, collects and stores exhaust heat from the exhaust gas discharged from the crater 1a through the confluence path 5 to the exhaust path 4, and A heat storage unit 13 is provided for heating the combustion air supplied to the crater 1a from the air supply path 3 through the confluence path 5 with stored exhaust heat.

In a set of two burner units 2, while one unit is generating flame, the other unit sucks and exhausts the exhaust gas, and these flames are emitted between the two burner units 2 at regular intervals. Generation and exhaust suction are switched.

The heat storage part 13 is filled with a large number of heat storage balls 13a, and the exhaust gas from the crater 1a and the combustion air from the air supply path 3 alternately flow through the heat storage balls 13a. The heat of the exhaust gas is stored in the heat storage balls 13a, and the heat is used to preheat the combustion air, thereby performing an energy-saving operation.

A chamber 14 called a so-called wind box is provided between the heat storage section 13 and the air supply valve 8 of the air supply path 3 and the exhaust valve 10 of the exhaust path 4 that pass through the junction path 5 .

A merging path 5 is connected to a peripheral wall 14 a forming the chamber 14 , thereby communicating the inside of the chamber 14 with the air supply path 3 and the exhaust path 4 .

Therefore, the combustion air from the air supply path 3 and the exhaust gas going to the exhaust path 4 are circulated in the chamber.

A grating 13b is provided between the chamber 14 and the heat storage section 13, and the chamber 14 and the heat storage section 13 are partitioned by this grating 13b.

The peripheral wall 14a of the chamber 14 is also provided with a communicating hole 14c that communicates the inside of the chamber 14 with the outside of the chamber 14, as shown in FIG.

In the present embodiment, the communication hole 14c is formed in a rectangular shape and is formed at a position facing the portion where the confluence path 5 is connected.

A damper 15 is provided in the chamber 14 for opening and closing the communication hole 14c.

The damper 15 includes a closing plate 15a that covers and closes the communication hole 14c from the inside of the chamber 14. As shown in FIG.

The closing plate 15a has its upper end attached to a shaft 15b that spans between the peripheral walls 14a and is rotatable with respect to the peripheral walls 14a. there is

The rotatable closing plate 15a is provided in the chamber 14 so as to be displaceable between a closed state for closing the communication hole 14c and an open state for opening the communication hole 14c.

The closing plate 15a is naturally suspended from the rotatable shaft 15b, and is configured to contact the peripheral wall 14a to close the communicating hole 14c.

When the combustion air is circulated in the chamber 14, the closing plate 15a is brought into contact with the peripheral wall 14a with a strong pressure due to the positive pressure generated in the chamber 14. As shown in FIG.

In the closed state where the closing plate 15a closes the communication hole 14c, the portion around the communication hole 14c where the closing plate 15a and the peripheral wall 14a abut against each other is provided on the side of the closing plate 15a, the side of the peripheral wall 14a, or both sides. A sealing material (not shown) is provided to seal the portion around the communicating hole 14c.

When the damper 15 opens the air supply valve 8 and pressurizes the combustion air from the air supply path 3 to the burner unit 2 through the chamber 14 and the heat storage section 13, the pressure inside the chamber 14 becomes positive, and the closing plate 15a moves toward the peripheral wall 14a. is pressed to close the communicating hole 14c.

On the other hand, when the exhaust valve 10 is opened and the exhaust gas in the furnace is sucked into the exhaust path 4 through the heat storage part 13 and the chamber 14, the pressure inside the chamber 14 becomes negative, and the closing plate 15a moves through the rotatable shaft 15b. As the chamber 14 rotates inwardly, the closing plate 15 separates from the peripheral wall 14a and the communicating hole 14c is opened.

At this time, the outside air outside the chamber 14 is sucked into the chamber 14 by the suction action of the exhaust blower 11 through the communication opening 14c, and the outside air is mixed with the exhaust gas inside the chamber 14. As shown in FIG. Exhaust gas mixed with outside air flows from the confluence path 5 into the exhaust path 4 and is discharged through the exhaust valve 10 .

That is, according to the regenerative burner 1 according to the present embodiment, the damper 15 provided in the chamber 14 which is provided between the heat accumulator 13 and the exhaust valve 10 and forms a flow path of the exhaust gas has a negative pressure inside the chamber 14 . Since the communication hole 14c is opened when the pressure is increased, the outside air is taken in through the communication hole 14c when the exhaust gas is discharged, and the exhaust gas passing through the chamber 14 is mixed with the taken outside air and the temperature is lowered.

As a result, exhaust gas whose temperature has been lowered by mixing with the outside air can flow through the exhaust valve 10, and damage to the exhaust valve 10 due to high-temperature exhaust gas can be prevented.

The damper 15 can open the communicating hole 14c only when the inside of the chamber 14 becomes negative pressure due to the suction action of the exhaust blower 11. Therefore, the configuration for taking outside air into the chamber 14 is extremely simple, and a dedicated power source is required. Since no control or the like is required, the installation cost can be reduced.

In this way, it is possible to provide the regenerative burner 1 which can lower the temperature of the exhaust gas flowing into the exhaust valve 10 with a simple structure and at a low cost.

Since the chamber 14 is provided closer to the exhaust valve 10 than the heat accumulator 13 , the exhaust gas has a high temperature when passing through the heat accumulator 13 . Therefore, it is possible to both lower the temperature of the exhaust gas passing through the exhaust valve 10 and store heat in the heat storage unit 13 with high-temperature exhaust gas.

Therefore, the exhaust valve 10 can be protected without reducing the thermal efficiency of the regenerative burner 1 .

In the above-described embodiment, the closing plate 15a is opened when the inside of the chamber 14 becomes negative pressure, but the present invention is not limited to this. For example, when it is difficult to displace the closing plate 15a to the open side only by changing the pressure in the chamber 14, such as when the closing plate 15a is heavy, an opening assist mechanism 16 is provided to assist the displacement of the closing plate 15a to the open state. You may prepare.

As shown in FIGS. 3 and 4, the opening assist mechanism 16 is provided, for example, on a shaft 15b projecting outward from the chamber 14. As shown in FIGS.

The opening assist mechanism 16 includes a connecting member 17 provided across the chamber 14 so as to connect both ends of the protruding shaft 15 b outside the chamber 14 .

As shown in FIG. 3(a), the connecting members 17 are provided at both ends of the shaft 15b, and are composed of arms 17a whose tip end protrudes from the chamber and connecting bars 17b that connect the tip end portions of these arms 17a. have.

The connecting member 17 is integrally formed with the closing plate 15a and the shaft 15b, and is configured to be rotated together with the closing plate 15a by the rotation of the shaft 15b.

The connecting bar 17b has a stud 18 having a threaded groove formed on its outer circumference protruding toward the communicating hole 14c side. are screwed together.

When the closing plate 15a naturally suspended from the rotatable shaft 15b closes the communicating hole 14c, the shaft 15b receives a rotational moment (Fig. 3) in which the closing plate 15a moves away from the communicating hole 14c. In the case of (a), when a counterclockwise rotational moment acts, it is possible to assist the displacement of the closing plate 15a to the open state, making it easier to open the closing plate 15a with a smaller force. As a result, the closing plate 15a can be reliably displaced to the open state by the negative pressure inside the chamber 14, and the communication hole 14c can be appropriately opened.

Rotating the weight 19 to move the weight 19 closer to the connecting bar 17b can reduce the rotational moment, and moving the weight 19 away from the connecting bar 17b can increase the rotational moment. Furthermore, by changing the position of the weight 19, it is possible to finely adjust the acting force of the opening assist mechanism 16 for opening the closing plate 15a.

Since the weight 19 is only screwed onto the stud 18, the position of the weight 19 can be easily moved and adjusted simply by rotating the weight 19. - 特許庁

Further, as shown in FIG. 3(b), the stud 18 of the opening assist mechanism 16 projects from the connecting bar 17b in the direction opposite to that shown in FIG. By screwing them together, it is possible to increase the rotational moment in the direction opposite to that in the case of FIG. 3(a).

As a result, the closing assist mechanism 20 is configured to assist the displacement of the closing plate 15a to the closed state so that the closing plate 15a is pressed more strongly toward the peripheral wall 14a and the communicating hole 14c is reliably closed. may

Furthermore, as shown in FIG. 3(c), by combining the configurations of FIGS. By doing so, both the opening assist mechanism 16 that assists the opening of the closing plate 15a and the closing assist mechanism 20 that assists the closing of the closing plate 15a may be provided.

If the opening assist mechanism 16 and the closing assist mechanism 20 are provided, it is possible to easily cope with any situation in which the closing plate 15a is difficult to open or difficult to close. The movement of the plate 15a can be finely adjusted.

As shown in FIG. 5, the opening assist mechanism 16 and the closing assist mechanism 20 may have a configuration in which a spring 21 is used to bias the connecting bar 17b.

The chamber 14 is provided with a supporting portion 22a which faces the connecting bar 17b with a space therebetween and receives and supports the spring force that urges the connecting bar 17b.

A threaded rod 22b having a spring seat 22c attached to its tip is screwed to the support portion 22a, and a spring 21 is provided in a compressed state between the spring seat 22c and the connecting bar 17b.

As shown in FIG. 5(a), when a spring 21 is installed on the opposite side of the communicating hole 14c with the shaft 15b interposed therebetween, the rotational moment around the shaft 15b causes the closing plate 15a to displace to the open state. An assisting opening assist mechanism 16 is obtained.

As shown in FIG. 5(b), when the spring 21 is installed closer to the communication hole 14c than the position of the shaft 15b, the rotational moment around the shaft 15b assists the displacement of the closing plate 15a to the closed state. A closing assist mechanism 20 is obtained.

Even when the springs 21 are used, both the opening assist mechanism 16 and the closing assist mechanism 20 can be installed side by side by arranging the springs 21 on both sides of the connecting bar 17b as shown in FIG. 5(c).

Also, in the above embodiment, the case where the damper 15 is provided in the chamber 14 has been described, but the present invention is not limited to this.

As shown in FIG. 6, an inspection opening 14d is provided in the chamber 14, and the inspection opening 14d is closed by a lid 14e (indicated by phantom lines in the drawing) that can be removed from the outside of the chamber 14. You may be trying to

At this time, a configuration can be employed in which a replacement unit 24 having a communication hole 24a and a damper 15 is attached to the chamber 14 so as to close the inspection opening 14 by replacing the cover 14e.

The replacement unit 24 is formed in a rectangular parallelepiped hollow box body, has a communicating hole 24a, and includes a damper 15 inside a housing 24b having an opening 24d formed in alignment with an inspection opening 14d. .

The housing 24b is provided with a flange portion 24c for attachment to the chamber 14 around the opening 24d.

When replacing the lid 14e with the replacement unit 24, the lid 14e is removed from the chamber 14 to open the inspection opening 14d. The replacement unit 24 is then mounted on the chamber 14 so as to block the access opening 14d.

When the flange portion 24c is attached to the chamber 14, the inside of the chamber 14 and the inside of the housing 24b are communicated through the inspection opening 14d and the opening 24d.

The communication hole 24a of the replacement unit 24 is releasably closed by the closing plate 15a of the damper 15, as in the above embodiment.

By using such a replacement unit 24, the damper 15 can be easily retrofitted to the existing regenerative burner 1, and the exhaust gas passing through the exhaust valve 10 can be reduced without modifying the existing regenerative burner 1. You can lower the temperature and protect it.

The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. The present invention can be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof.

1 regenerative burner 1a crater 2 burner unit 3 air supply path 4 exhaust path 5 merging path 6 fuel nozzle 7 fuel supply path 8 air supply valve 9 air supply blower 10 exhaust valve 11 exhaust blower 12 fuel supply valve 13 heat storage section 13a heat storage ball 13b grating 14 chamber 14a peripheral wall,
14c communication opening 14d inspection opening 14e lid 15 damper 15a closing plate 15b shaft 16 opening assist mechanism 17 connecting member 17a arm 17b connecting bar 18 stud 19 weight 20 closing assist mechanism 21 spring 22a support portion 22b screw rod 22c spring seat 24 replacement Unit 24a Communication opening 24b Housing 24c Flange 24d Opening 25 Air supply branch 26 Exhaust branch

Claims (6)

an exhaust valve that is opened when the exhaust gas is discharged;
a heat storage unit that stores heat from the discharged exhaust gas;
a chamber provided between the heat storage unit and the exhaust valve, through which the exhaust gas flows;
a communication hole provided in the chamber and communicating between the inside and outside of the chamber;
A regenerative burner, comprising: a damper which is provided so as to be able to close the communicating hole, and which opens the communicating hole when the inside of the chamber becomes negative pressure. The damper includes a closing plate that is rotatably provided and that can be displaced between a closed state that closes the communication hole and an open state that opens the communication hole, and an opening that assists the displacement of the closing plate to the open state. The regenerative burner according to claim 1, further comprising an assist mechanism. The damper includes a closing plate that is rotatably provided and that can be displaced between a closed state that closes the communicating hole and an open state that opens the communicating hole, and a closing plate that assists the displacement of the closing plate to the closed state. The regenerative burner according to claim 1, further comprising an assist mechanism. the chamber includes an inspection opening closed by a removable lid instead of the communication opening;
2. The damper is provided in a replacement unit which has a communication hole communicating between the inside and the outside of the chamber, and which is attached so as to close the inspection opening by replacing the lid. 3. The regenerative burner according to any one of items 1 to 3. an exhaust valve that is opened when the exhaust gas is discharged; a heat storage unit that stores heat from the discharged exhaust gas; a chamber that is provided between the heat storage unit and the exhaust valve and through which the exhaust gas flows; a regenerative burner having an inspection opening provided and closed by a removable lid,
A communication opening provided to communicate between the inside and outside of the chamber can be closed, and the communication is opened when the inside of the chamber becomes negative pressure. A regenerative burner replacement unit comprising a damper for opening a hole. A method for exchanging a replacement unit for a regenerative burner according to claim 5,
A method for replacing a replacement unit for a regenerative burner, comprising removing the cover from the chamber to open the inspection opening, and then mounting the replacement unit to the chamber so as to close the inspection opening.

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