JPH11264667A - Thermal storage burner system for rotary melting furnace - Google Patents

Abstract

(57) [Problem] To provide a regenerative burner system for a rotary melting furnace capable of efficiently collecting waste heat, reducing the amount of oxygen used, and reducing the melting cost. SOLUTION: A rotary melting furnace 2 having a melting chamber 20 for melting cast iron, and a pair of regenerative burners 1 for blowing a flame into the melting chamber 20 are provided. Then, the combustion air A heated through the heat storage body 116 of the first regenerative burner 11 is supplied to one of the first regenerative burners 11, and during this time, the second
The regenerative burner 12 discharges the combustion exhaust gas E through the regenerator 126 of the second regenerative burner 12, and
After the elapse of a predetermined time, the introduction of the combustion air and the combustion exhaust gas is switched to the first regenerative burner 1.
1 combustor 112 and the combustor 12 of the second regenerative burner 12
2 are configured to emit the flame alternately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a rotary melting furnace using a regenerative burner capable of recovering and reusing waste heat of combustion exhaust gas.

[0002]

2. Description of the Related Art As a melting furnace for melting a material to be melted such as cast iron, for example, the following melting furnace is used. That is, as shown in FIG. 10, the melting furnace 9 includes a furnace body 92 and a burner 9 for melting the material to be melted charged in the furnace body 92.
Consists of 1. The furnace body 92 has a melting chamber 920 therein.
And is driven to rotate about a horizontal axis. The burner 91 is connected to the opening 921 of the furnace body 92 for burning fuel with oxygen to eject a flame into the melting chamber 920. On the other hand, an exhaust duct 96 is connected to the opening 922 of the furnace body 92.
Reference numeral 929 in the figure denotes a drive gear, 928 denotes a tap hole, and 98 denotes a molten metal receiver.

[0003]

However, in the conventional melting furnace 9, the combustion exhaust gas is discarded by the exhaust duct 96, so that the waste heat cannot be recovered and reused. Therefore, high thermal efficiency is obtained by using high-purity oxygen that can make the flame temperature relatively high for combustion. Therefore, the use of oxygen having a high unit price prevents the cost of dissolution from being reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above problems, and has been made in consideration of the above circumstances. It is intended to provide an automatic burner system.

[0005]

According to the first aspect of the present invention, there is provided a rotary melting furnace having a melting chamber for melting cast iron, and a pair of heat storages having a combustor for emitting a flame into the melting chamber of the rotary melting furnace and a heat storage body. A burner, and an air blower for feeding combustion air to a regenerator of the regenerative burner. One of the first regenerative burners receives combustion air heated through the regenerator. During this time, the other second regenerative burner discharges combustion exhaust gas through the regenerator to store heat in the regenerator, and after a predetermined time elapses,
By switching the introduction of combustion air and combustion exhaust gas,
The regenerative burner system for a rotary melting furnace is characterized in that the pair of regenerative burner combustors are configured to emit a flame alternately.

The most remarkable point in the present invention is that the regenerative burner system is provided with a regenerative burner for enabling waste heat recovery.

Next, the operation of the present invention will be described. In the present invention, first, combustion air is fed into the heat storage body of the first regenerative burner, and a flame is blown out of the combustor of the first regenerative burner to melt the cast iron in the melting chamber. Then, the burned combustion air becomes combustion exhaust gas and is discharged to the outside of the rotary melting furnace through the second regenerative burner. At this time, the temperature of the heat storage body of the second regenerative burner increases because waste heat (sensible heat) of the combustion exhaust gas is recovered.

After a lapse of a predetermined time, switching is performed to introduce combustion air into the heat storage body of the second regenerative burner. At this time, the temperature of the combustion air is increased by the heat storage body whose temperature has been increased. The second regenerative burner performs combustion using the heated fuel air. The combustion exhaust gas generated by this is discharged outside the rotary melting furnace through the first regenerative burner. Therefore, as in the above, the first
The temperature of the regenerator of the regenerative burner is increased by the combustion exhaust gas.

As described above, by performing combustion alternately with a pair of regenerative burners, the regenerative burner in the exhaust gas can store waste heat in the heat storage body. Therefore, the heat storage body of the regenerative burner can raise the temperature of the combustion air by utilizing the waste heat stored during combustion. Therefore, high thermal efficiency can be obtained.

Next, as in the second aspect of the present invention, the regenerative burner system may include an oxygen enrichment device for enriching oxygen gas in the melting chamber. The oxygen gas may be directly enriched in the melting chamber, or may be enriched before entering the melting chamber, for example, between the air blower and the heat storage body of the regenerative burner. In this case, higher thermal efficiency can be obtained within the limit of the melting cost.

Next, as in the third aspect of the present invention, the regenerative burner system generates a large amount of carburizing agent in the combustion exhaust gas added for adjusting the cast iron component in the rotary melting furnace. It is preferable to have an auxiliary oxygen source supply device for supplying air, oxygen, and oxygen-enriched air for burning the generated carbon monoxide gas and recovering the combustion heat in the regenerative burner. A blower, an oxygen gas cylinder, or the like can be used as the auxiliary oxygen source supply device. When a pipe heat exchanger or the like is provided inside the regenerative burner, a preheated high-temperature gas inside the regenerative burner is used as an auxiliary oxygen source such as air, oxygen, or oxygen-enriched air. be able to.

In this case, an auxiliary oxygen source is fed into the combustor of the regenerative burner in the exhaust gas for oxidizing carbon monoxide gas, and is subjected to secondary combustion, and is stored in the regenerator of the regenerative burner. The carbon monoxide gas can be completely burned.
Therefore, the heat of combustion of the carbon monoxide gas can be stored in the heat storage body. In the production of cast iron, the carbon monoxide gas contained in the combustion exhaust gas has a relatively high concentration because a carburizing agent is added for adjusting the components of the cast iron.

Next, the regenerative burner is provided with a gap between the regenerative burner and the rotary melting furnace, and a part of the combustion exhaust gas is removed from the gap. It is preferable to have a pressure adjusting device for sucking and returning it to the regenerative burner.

Incidentally, a blower or the like can be used as the pressure adjusting device. In this case, the combustion exhaust gas in the rotary melting furnace is sucked from the gap,
Pressure fluctuations in the rotary melting furnace can be suppressed to reduce the increase in gas volume due to combustion heat. Further, it is possible to prevent the combustion exhaust gas containing a large amount of carbon monoxide gas from leaking from the rotary melting furnace.

When an exhaust blower for sucking and exhausting most of the combustion exhaust gas from the regenerator of the regenerative burner is provided, the exhaust blower is provided with a gap between the regenerative burner and the rotary melting furnace. The exhaust blower can also be used as a blower of a pressure regulator by sucking a part of the combustion exhaust gas.

Next, according to a fifth aspect of the present invention, the burner includes a burner port for passing combustion air or combustion exhaust gas heated through the regenerator and a fuel supply port disposed outside the burner port. It is preferable to have a fuel nozzle. In this case, the combustion exhaust gas can be reduced in NOx.

Next, as in the sixth aspect of the present invention, the axis of the fuel injection port provided at the tip of the fuel nozzle is provided in a direction inclined with respect to the axis of the fuel nozzle. Preferably, the fuel nozzle is provided rotatably.
In this case, the direction of the fuel ejection port can be freely changed by rotating the fuel nozzle. Therefore, the direction of the flame can be adjusted to the direction of the cast iron to be melted according to the amount of cast iron charged and the progress of melting. Therefore, the dissolution efficiency can be improved.

Next, it is preferable that the combustor has a nozzle for supplying auxiliary air or oxygen gas. In this case, the atmosphere in the rotary melting furnace can be adjusted by adjusting the position, number, and flow rate of the nozzles so that the lower portion of the rotary furnace has an excessive amount of fuel and the upper portion has an excessive amount of oxygen.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A regenerative burner system for a rotary melting furnace according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the regenerative burner system according to the present embodiment includes a rotary melting furnace 2 having a melting chamber 20 for melting cast iron, and a regenerative burner 1 for blowing a flame into the melting chamber 20 of the rotary melting furnace 2. And an air blower 61 for feeding combustion air A to the regenerative burner 1 and an exhaust blower 62 for feeding combustion exhaust gas E from the regenerative burner 1. The regenerative burner 1 includes a first regenerative burner 11 having a combustor 112 and a regenerator 116, and a combustor 122 and a regenerator 1.
26 and a second regenerative burner 12 having the same.

As shown in FIG. 1, the first regenerative burner 11 is supplied with combustion air A heated through a regenerator 116 to a combustor 112, and is supplied into a melting chamber 20 of a rotary melting furnace 2. Emit a flame. During this time, the second regenerative burner 12 discharges the combustion exhaust gas E through the regenerator 126 to cause the regenerator 126 to store heat. After a lapse of a predetermined time, the introduction of the combustion air A and the combustion exhaust gas E is switched to perform the first regenerative burner 11 and the second regenerative burner 1.
2, the flames are alternately ejected from the respective combustors 112 and 122.

In the regenerative burner system, an oxygen enrichment device for enriching oxygen gas X in the melting chamber 20 and auxiliary air a are fed to the regenerative burner 1 to reduce carbon monoxide in the combustion exhaust gas. Burns gas and stores the heat of combustion in regenerative burner 1
A part of the combustion exhaust gas e is sucked from a gap Q provided between the regenerative burner 1 and the rotary melting furnace 2 and the pressure is returned to the regenerative burner 1 Device.

Hereinafter, each component of the regenerative burner system of this embodiment will be described in detail. As shown in FIG. 1, the rotary melting furnace 2 has a cylindrical shape and has openings 21 and 22 at both ends for mounting a regenerative burner 1. Opening 21,
Reference numeral 22 communicates with a melting chamber 20 provided inside the rotary melting furnace 2. As shown in FIG. 2, a refractory material 24 is lined on the outer peripheral wall 23 of the rotary melting furnace 2. In addition,
The outer peripheral wall 23 has a driving gear 29 for rotation on its outer periphery. Although not shown, the rotary melting furnace 2 is
It has a charging port, a slag discharge port, and a tap hole (see FIG. 10) for charging a material to be melted such as a steel plate and steel scrap and a carburizing agent into the melting chamber 20.

Next, as shown in FIG. 1, the first regenerative burner 11 is disposed in the opening 21 of the rotary melting furnace 2 and
The regenerative burner 12 is arranged in the opening 22. The first regenerative burner 11 is connected to the air blower 61 and the exhaust blower 62 via the main pipe 610 and the switching valve 64. The second regenerative burner 12 is similarly connected via the main pipe 620. The first regenerative burner 11 and the second regenerative burner 12 are connected to a fuel pipe 80. Note that reference numeral 84 in the figure denotes an electromagnetic valve.

The first regenerative burner 11 and the second regenerative burner 12 have the same structure except for the mounting position.
Hereinafter, the structure of the second regenerative burner 12 will be described with reference to FIG. The second regenerative burner 12 includes a combustor 122.
And a heat storage element 126. The heat storage element 126 made of ceramic balls, saddles, honeycombs, and the like is disposed outside the rotary melting furnace 2. In addition, the heat storage 126
Is connected to the main pipe 620, and the other is connected to the combustor 122. The combustor 122 has a gap Q between the combustor 122 and the opening 22 of the rotary melting furnace 2.
Part of it is inserted. In addition, the combustor 122 includes:
The fuel pipe 80 is connected to respective feed pipes of an oxygen enrichment device, an auxiliary oxygen source supply device, and a pressure adjustment device, which will be described later.

As shown in FIG. 1, the oxygen enrichment apparatus comprises an oxygen supply source 3, an oxygen supply pipe 30 (FIG. 2), and solenoid valves 341 and 3
42. The oxygen supply source 3 is connected to the combustor 112 of each regenerative burner via the oxygen inlet pipe 30 and the solenoid valve 341.
122. The oxygen supply source 3 is connected between the air blower 61 and the switching valve 64 via the oxygen supply pipe 30 and the electromagnetic valve 342. The auxiliary oxygen source supply device includes an auxiliary air blower 5 and an auxiliary air supply pipe 50.
(FIG. 2) and a switching valve 54. Auxiliary air blower 5
Are connected to the combustors 112 and 122 of each regenerative burner via the auxiliary air inlet pipe 50 and the switching valve 54.

The pressure adjusting device includes an exhaust hood 77 (FIG. 2) for collecting a part e of the combustion exhaust gas E leaking from the gap Q between the rotary melting furnace 2 and the regenerative burner 1, and a pressure adjusting blower. 7. It comprises retransmission inlet pipes 710 and 720 (FIG. 2) and switching valves 741 and 742. The rotary melting furnace 2 is connected to the pressure adjusting blower 7 via an exhaust hood 77, a re-feed pipe 710, and a switching valve 741. The pressure adjusting blower 7 is connected to the combustors 112 and 122 of the regenerative burner 1 via the switching valve 742 and the re-sending pipe 720.

Hereinafter, the operation of the regenerative burner system will be described in detail. In this example, as shown in FIG.
First, the air blower 61 is connected to the switching valve 64 and the main pipe 61.
The combustion air A is supplied to the heat storage body 116 of the first regenerative burner 11 through the air storage device 0. On the other hand, the fuel F is fed into the combustor 112 of the first regenerative burner 1 from the fuel pipe 80. Then, a flame is ejected from the combustor 112 of the first regenerative burner 1 to melt the cast iron in the melting chamber 20. The burned combustion air A becomes combustion exhaust gas E in the melting chamber 20. The exhaust blower 62 discharges the combustion exhaust gas E to the outside of the rotary melting furnace 2 through the second regenerative burner 12, the main pipe 620, and the switching valve 64. At this time, the temperature of the heat storage body 126 of the second regenerative burner 12 increases because the waste heat (sensible heat) of the combustion exhaust gas E is recovered.

After a lapse of a predetermined time, the switching valve 6
4 through the main pipe 620 to switch the second
Combustion air is introduced into the heat storage body 126 of the heat storage burner 12. At this time, the combustion air is stored in the heat storage body 12 whose temperature has been increased.
The temperature is raised by 6. And the second regenerative burner 12
Burns using the heated fuel air. The combustion exhaust gas generated by this is discharged to the outside of the rotary melting furnace 2 through the first regenerative burner 11 and the main pipe 610. Therefore, similarly to the above, the first regenerative burner 11
Is heated by the combustion exhaust gas.

As described above, the first regenerative burner 11 and the second regenerative burner 12 perform combustion alternately, for example, as shown in FIG. The heat storage 126 can store waste heat. Therefore, the heat storage element 126 of the second regenerative burner 12
During combustion, the temperature of the combustion air can be raised using the waste heat stored. The first regenerative burner 11 also
Waste heat is stored in the heat storage body 116 during exhaust, and the temperature of the combustion air A can be raised by the waste heat during combustion.

Next, the operation of the oxygen enrichment device, the auxiliary oxygen source supply device, and the pressure adjusting device when the first regenerative burner 11 is performing combustion will be described. As shown in FIG. 1, the oxygen supply source 3 of the oxygen enrichment device is connected to the air supply pipe 30 between the air blower 61 and the switching valve 64 and at three places of the combustors 112 and 122 of each regenerative burner. Oxygen gas X is supplied. Then, by opening the solenoid valve 341 located on the first regenerative burner 11 side during combustion, the oxygen gas X is enriched in the combustor 112 of the first regenerative burner 11 during combustion. By burning the oxygen gas X, higher thermal efficiency can be obtained within the limits of the melting cost. The electromagnetic valve 3 located between the blower 61 and the switching valve 64
The oxygen gas X can also be enriched by opening the opening 42 (see Embodiment 4).

Next, the auxiliary air blower 5 of the auxiliary oxygen source supply device feeds the auxiliary air a into the combustor 122 of the second regenerative burner in the exhaust gas through the auxiliary air inlet pipe 50 and the switching valve 54. . Therefore, auxiliary air a is supplied to the combustor 122 of the second regenerative burner 12 in the exhaust gas for oxidizing the carbon monoxide gas in the combustion exhaust gas, and the heat is stored in the regenerator 126 of the second regenerative burner. Thus, the carbon monoxide gas can be completely burned. Therefore, the heat of combustion of the carbon monoxide gas can be stored in the heat storage body 126. The concentration of carbon monoxide gas generated in a large amount from the carburizing agent added for adjusting the cast iron component in the rotary melting furnace is 25 to 45%.

Next, the pressure adjusting blower 7 of the pressure adjusting device
Is a part of the combustion exhaust gas leaking from the gap Q between the rotary melting furnace 2 and the regenerative burner 1 through the exhaust hood 77, the re-supply pipe 710, and the switching valve 741 provided on the combustor 122 side of the second regenerative burner 12. The part e is sucked. The inside of the rotary melting furnace 2 and the exhaust hood 77 is suctioned by the pressure adjusting blower 7 and has a negative pressure. Then, the pressure adjusting blower 7 sends the combustion exhaust gas E to the combustor 112 of the first regenerative burner 1 through the switching valve 742 and the re-sending pipe 720.
Is re-transmitted.

For this reason, the combustion exhaust gas in the melting furnace 20 of the rotary melting furnace 2 is sucked from the gap Q to reduce an increase in gas volume due to combustion heat. Therefore, melting chamber 2
Pressure fluctuation within 0 can be suppressed. The above-described operation is particularly remarkable at the start of combustion when the gas temperature is low.

In the regenerative burner system of this embodiment,
Since the waste heat is efficiently collected, high thermal efficiency can be obtained. Therefore, the amount of oxygen used for obtaining high thermal efficiency can be reduced. Therefore, the running cost can be suppressed and the melting cost can be reduced.

In this embodiment, the use of the switching valve 64 allows the main pipes 610 and 620 to serve both to feed combustion air and exhaust combustion exhaust gas. However, it is not always necessary to use the switching valve 64. That is, each regenerative burner is provided with a pipe for feeding combustion air and a pipe for exhausting combustion exhaust gas.
It is also possible to provide a solenoid valve for each pipe. The same applies to the switching valve 54 of the auxiliary oxygen source supply device and its piping.

Embodiment 2 This embodiment is different from Embodiment 1 in that the combustion nozzle 82 is located outside the burner port 10 as shown in FIGS.
Is different from That is, as shown in FIG. 4, the combustor 112 of the regenerative burner 11 includes the burner port 10 for passing the combustion air A or the combustion exhaust gas E and the fuel nozzle 82 for fuel supply disposed outside the burner port 10. And
As shown in FIG. 5, the axis of the fuel outlet 820 provided at the tip of the fuel nozzle 82 is aligned with the fuel nozzle 82.
Are provided in a direction inclined with respect to the axis of the shaft. As shown in FIG. 6, the fuel nozzle 82 is provided rotatably. Similarly, the combustor 12 of the regenerative burner 12
2 also has the burner port 10 and the fuel nozzle 82. Other configurations are the same as those of the first embodiment.

In this embodiment, the low N
Oxification can be achieved, and as shown in FIG.
By rotating the fuel nozzle 82, the direction of the fuel outlet 820 can be freely changed. Therefore, depending on the amount of cast iron and the progress of melting,
Since the fuel F can be injected into the combustion air A, the direction of the flame on the heat storage burner side during combustion can be adjusted to the direction of the cast iron to be melted. Therefore, the dissolution efficiency can be improved. Others have the same operation and effects as the first embodiment.

Embodiment 3 In this embodiment, as shown in FIG. 7, the combustor 112 includes a secondary combustion nozzle 32 for supplying oxygen gas Y for secondary combustion.
Is provided. The above combustor 112
It is a combustor in a regenerative burner in exhaust gas. Similarly, the combustor 122 also has the secondary combustion nozzle 32. Others are the same as the second embodiment.

In this embodiment, the oxygen gas Y is supplied from the secondary combustion nozzle 32 to supply the auxiliary air a from the auxiliary air supply pipe 50 in the first embodiment. The same operation as the device can be obtained. The other effects are the same as those of the second embodiment.

In the first embodiment, the auxiliary air a is supplied from the auxiliary air inlet pipe 50 for the secondary combustion. However, the auxiliary air a is supplied from the secondary combustion nozzle 32. It is also possible.

Fourth Embodiment As shown in FIGS. 8 and 9, the present
Is an oxygen enrichment nozzle 33 for supplying oxygen gas X.
Is provided. Similarly, the combustor 112 also has an oxygen enrichment nozzle 33.

FIG. 8 shows an example in which the oxygen-enriched nozzle 33 is disposed substantially perpendicular to the burner port 10. FIG. 9A shows an example in which the oxygen-enriched nozzle 33 is disposed in a direction substantially parallel to the fuel nozzle 82. FIG. 9B shows an example in which the oxygen-enriched nozzles 33 are arranged at a plurality of locations. FIG. 9C shows an example in which the oxygen-enriched nozzle 33 is disposed above the burner port 10 and the fuel nozzle 82 is disposed below the burner port 10. Others are the same as the second embodiment.

In this embodiment, for example, as shown in FIG. 9C, the oxygen enrichment nozzle 33 and the fuel nozzle 82
And the melting chamber 20 of the rotary melting furnace 2 is provided.
The lower part of the inside can be partially made a reducing atmosphere. In other words, the position and number of the oxygen enrichment nozzle 33 and the fuel nozzle 82 are variously combined, so that the melting chamber 20
The atmosphere inside can be partially adjusted. The other effects are the same as those of the second embodiment.

In the third embodiment, the secondary combustion nozzle 32 provided in the combustor of the regenerative burner in the exhaust gas is
At the time of combustion, it can also be used as the oxygen enrichment nozzle 33. Conversely, the oxygen enrichment nozzle 33 can also be used as the secondary combustion nozzle 32.

Further, as shown in FIG. 1, the blower 61 and the switching valve 64 are provided like the oxygen enrichment device in the first embodiment.
By opening the solenoid valve 342 located between the burners 11 and 12 through the main pipes 610 and 620, the oxygen gas X
To enrich the oxygen gas X.

Further, although not shown, the combustion exhaust gas E discharged from the exhaust blower 62 in the first embodiment is re-supplied to the main pipes 610 and 620 and mixed with the oxygen gas X. Then, the pseudo air generated by mixing the combustion exhaust gas E and the oxygen gas X is fed into one of the regenerative burners 11 and 12 during combustion to enrich the oxygen gas X. You can also.

[0047]

As described above, according to the present invention, there is provided a regenerative burner system for a rotary melting furnace capable of efficiently recovering waste heat, reducing the amount of oxygen used, and reducing melting costs. can do.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a regenerative burner system according to a first embodiment.

FIG. 2 is a sectional view of a rotary melting furnace and a regenerative burner according to the first embodiment.

FIG. 3 is a diagram illustrating a burner port and a fuel nozzle in a regenerative burner combustor according to a second embodiment.

FIG. 4 is a cross-sectional view of a regenerative burner combustor according to a second embodiment.

FIG. 5 is a diagram illustrating a fuel nozzle and a fuel ejection port according to a second embodiment.

FIG. 6 is a diagram illustrating rotation of a fuel injection port according to a second embodiment.

FIG. 7 is a diagram illustrating a nozzle of a combustor for secondary combustion according to a third embodiment.

FIG. 8 is a diagram illustrating a nozzle of a combustor for enriching oxygen according to a fourth embodiment.

FIG. 9 is a sectional view of a regenerative burner combustor according to a fourth embodiment.

FIG. 10 is a sectional view of a melting furnace according to a conventional example.

[Explanation of symbols]

 1. . . 10. regenerative burners, . . 1st regenerative burner, 112. . . Combustor, 116. . . 11. heat storage, . . 122. Second regenerative burner . . Combustor, 126. . . Heat storage, 2. . . Rotary melting furnace, 20. . . Dissolution chamber, 21, 22,. . . 2. an opening; . . Oxygen supply source, 5. . . Auxiliary air blower, 61. . . Air blower, 610, 620. . . Main pipe, 62. . . Exhaust blower, 64. . . Switching valve, 7. . . Pressure adjustment blower,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Ito 19-18 Sakuradacho, Atsuta-ku, Nagoya City, Aichi Prefecture Inside Higashi Kokugasu Co., Ltd. (72) Inventor Shin Shizukuishi 3-13-1, Minamisenju, Arakawa-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Susumu Uchida 3-13-1, Minamisenju, Arakawa-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Satoru Murakawa 208, Nishiyama, Shizu, Oaza, Kuwana-shi, Mie Metal Testing Laboratory, Mie Prefecture

Claims (7)

[Claims] 1. A rotary melting furnace having a melting chamber for melting cast iron, a pair of regenerative burners having a combustor and a regenerator for blowing a flame into the melting chamber of the rotary melting furnace, and the regenerative burner An air blower for feeding combustion air to the heat storage element of the first type, and one of the first heat storage type burners has:
The combustion air heated through the regenerator is supplied to the combustor, and during this time, the other second regenerative burner discharges combustion exhaust gas through the regenerator to store heat in the regenerator, and the heat is stored in the regenerator. After the lapse of time, the introduction of the combustion air and the combustion exhaust gas is switched, and the combustors of the pair of regenerative burners are configured to alternately emit a flame. Regenerative burner system for furnaces. 2. The regenerative burner system for a rotary melting furnace according to claim 1, wherein the regenerative burner system has an oxygen enrichment device for enriching oxygen gas in the melting chamber. 3. The regenerative burner system according to claim 1, wherein the regenerative burner system is characterized in that a large amount of monoxide generated from a carburizing agent in the combustion exhaust gas added for adjusting a cast iron component in a rotary melting furnace. An auxiliary oxygen source supply device for supplying air, oxygen, and oxygen-enriched air for combusting carbon gas and recovering the combustion heat to the regenerative burner. Thermal storage burner system. 4. The method according to claim 1, wherein:
The regenerative burner is disposed with a gap between the regenerative melting furnace and a pressure for sucking a part of the combustion exhaust gas from the gap and returning it to the regenerative burner. A regenerative burner system for a rotary melting furnace having an adjusting device. 5. The method according to claim 1, wherein:
A rotary melting furnace having a burner port for passing combustion air or combustion exhaust gas heated through the regenerator and a fuel nozzle disposed outside the burner port for supplying fuel; Regenerative burner system. 6. The fuel nozzle according to claim 5, wherein the axis of the fuel injection port provided at the tip of the fuel nozzle is provided in a direction inclined with respect to the axis of the fuel nozzle, and the fuel nozzle rotates. A regenerative burner system for a rotary melting furnace, wherein the system is provided as possible. 7. The method according to claim 1, wherein:
A regenerative burner system for a rotary melting furnace, wherein the combustor has a nozzle for supplying auxiliary air or oxygen gas.