JP2000035207A - Thinning operation method for regenerative burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of a heat storage body by a method wherein when thinning operation is effected by switching, in order, a plurality of regenerative burners, and in the switching, the regenerative burner always terminates in combustion. SOLUTION: Supply valves 52 and 53 and an exhaust valve 55 are opened and air supply valves 51 and 54 and an exhaust valve 56 are closed. A regenerative burner A1 is caused to effect combustion, exhaust gas therefrom is sucked by a regenerative burner B1, and the heat of exhaust gas is stored in a heat storage body 22. Thereafter, when the regenerative burner B1 is caused to effect combustion, combustion air is preheated by the heat storage body 22 to store heat. In this case, the regenerative burners are brought into a state to be always terminated in combustion during switching of the burners. This constitution, since the heat storage body is reduced in temperature to a suited low value through heat-exchange with combustion air or fuel, prevents the increase of temperature to a so high value through heating even when high temperature exhaust gas in a furnace gradually penetrates during rest, resulting in prevention of deterioration of the heat storage body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerating burner thinning operation method. Equipped with multiple sets of regenerative burners, usually one set of opposing regenerative burners, on both sides of the heating furnace, and when burning one regenerative burner,
When the exhaust gas is sucked into the regenerative burner on the other side, the heat of the exhaust gas is stored in the heat storage body of the regenerative burner on the other side, and then when the regenerative burner on the other side is burned,
The combustion air or fuel supplied to the other side of the regenerative burner is preheated with the heat stored in the heat storage body and then burned, and the exhaust gas is sucked into the one side of the regenerative burner to reduce the heat of the exhaust gas. The material to be heated in the furnace is heated under the alternating combustion of the regenerative burner in which the heat is stored in the heat storage body of the one side regenerative burner.

In the alternating combustion of the regenerative burner as described above, if it is necessary to reduce the amount of combustion of the regenerative burner depending on the size and material of the material to be heated or when a trouble occurs, for the time being, the regenerative burner must be supplied to the regenerative burner. Lower the fuel supply,
If the fuel supply amount is reduced too much, the combustion of the regenerative burner will be extinguished or the combustion will be incomplete. In the thinning operation of the regenerative burner, some of the regenerative burners are burned while the regenerative burners that are not involved in the combustion of the burners and the suction of the exhaust gas are left, and the exhaust gas is sucked into some other regenerative burners. This is a method of sequentially switching the operation of causing the operation to be performed. The present invention relates to an improvement in such a regenerating burner thinning operation method.

[0003]

2. Description of the Related Art Conventionally, as a thinning operation method of a regenerative burner, a thinning operation method in which a regenerative burner is alternately burned in a set has been proposed (JP-A-8-3562).
3). In this conventional method, for example, when four sets of regenerative burners are provided, one set of regenerative burners opposed to both sides of the heating furnace (a total of eight regenerative burners), first, the second set, the third set, and the fourth set With the first regenerative burner at rest, the first regenerative burner is burned on one regenerative burner, the exhaust gas is drawn into the other regenerative burner, and then the other regenerative burner is burned. Alternate combustion is performed in which the exhaust gas is sucked into one of the regenerative burners. Next, with the first, third, and fourth sets of regenerative burners stopped, the second set of regenerative burners is alternately burned in the same manner as the first set of regenerative burners. Similarly, after the third and fourth sets of regenerative burners are sequentially fired alternately, the operation of returning to the first set of regenerative burners and causing the first set of regenerative burners to be fired again is sequentially switched. Is the way.

[0004] Therefore, in the conventional method described above, when switching from alternating combustion of the first set of regenerative burners to alternating combustion of the second set of regenerative burners, one of the first set of regenerative burners emits exhaust gas. Will be terminated. The same applies to the second, third, and fourth regenerative burners. However, such a conventional method has a problem that the heat storage body of the regenerative burner that has been terminated by sucking the exhaust gas is deteriorated. The regenerative burner heat storage that has been terminated by exhaust gas suction has a relatively high temperature due to exhaust gas suction and, due to gas leakage from an exhaust valve connected downstream thereof, This is because the high-temperature exhaust gas in the furnace gradually invades even during the stoppage of the furnace, and as a result, the furnace is overheated beyond its heat-resistant temperature. In general, the heat storage body is formed by laminating heat storage materials having different heat-resistant temperatures in terms of cost, but when the heat storage material is overheated as described above, the heat storage material having a low heat-resistant temperature is particularly low. Deterioration is rapid.

[0005]

The problem to be solved by the present invention is that in the conventional thinning operation method in which the regenerative burners are alternately burned in one set, the heat storage body deteriorates.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to burn a part of a regenerative burner while leaving the regenerative burner not involved in the combustion of the burner and the suction of the exhaust gas. In a thinning operation method of a regenerating burner in which an operation of sequentially sucking the exhaust gas to another part of the regenerating burner is performed, in which the regenerating burner is terminated by combustion at the time of the switching. Related to driving method.

In the present invention, the operation of alternatingly burning the regenerative burners in units of one set as in the conventional method is not performed by sequentially switching, but upon switching, each regenerative burner is terminated by combustion. For example, when four regenerative burners A1 to A4 are installed on one side of the heating furnace, and four regenerative burners B1 to B4 are installed on the other side (total of eight regenerative burners). First, with the other regenerative burners stopped, the regenerative burner A1 is burned, and the exhaust gas is sucked into the regenerative burner B1. Next, with the other regenerative burners stopped, the regenerative burner B1 is burned, and the exhaust gas is sucked into the regenerative burner A2. Further, while the other regenerative burners are stopped, the regenerative burner of A2 is burned, and the exhaust gas is sucked into the regenerative burner of B2. Similarly, the regenerating burners B2, A3, B3, A4, and B4 are sequentially burned, and the exhaust gas when the regenerating burner B4 is burned is sucked into the regenerating burner A1. The following is the repetition, but each regenerative burner is always in a state of being terminated by combustion at the time of switching.

[0008] The switching operation as described above is a thinning operation method in which one regenerative burner is sequentially burned.
It is also possible to perform a thinning operation by burning two regenerative burners sequentially. For example, when a total of eight regenerative burners are installed in the same manner as described above, first, while the other regenerative burners are stopped, the regenerative burners A1 and A2 are burned, and the exhaust gas is sucked into the regenerative burners B1 and B2. Let it. Next, while the other regenerative burners are stopped, the regenerative burners B1 and B2 are burned, and the exhaust gas is sucked into the regenerative burners A3 and A4. Further, while the other regenerative burners are stopped, the regenerative burners A3 and A4 are burned, and the exhaust gas is sucked into the regenerative burners B3 and B4. Then, with the other regenerative burners stopped, the regenerative burners B3 and B4 are burned, and the exhaust gas is sucked into the regenerative burners A1 and A2. The following is the repetition, but also in this case, each regenerative burner is always in a state of being terminated by combustion at the time of switching.

Although it depends on the number of regenerative burners installed in the heating furnace, three or more regenerative burners can be burned sequentially to perform a thinning operation. In any case, each regenerative burner is always terminated by combustion at the time of the switching. According to the present invention, the regenerative burner of each regenerative burner that has been terminated by combustion has a correspondingly low temperature due to heat exchange with combustion air or fuel. Even if high-temperature exhaust gas in the furnace gradually enters during a stop due to the gas leakage, the high-temperature exhaust gas is not heated so much, so that the deterioration of the heat storage body can be prevented.

[0010]

1 is a schematic perspective view showing a thinning operation method according to the present invention in a longitudinal section in a furnace width direction, and FIG. 2 is a schematic sectional view showing the same thinning operation method as in FIG. 1 in a furnace length direction. View, FIG.
FIG. 4 is a schematic view showing a cross section in a furnace length direction of another thinning operation method according to the present invention. Four regenerative burners A1 to A4 are provided on one side of the heating furnace 11, and four regenerative burners B1 to B4 are also provided on the other side opposite to these. The regenerative burner A1 has a heat storage element 21, and the regenerative burner B1 also has a heat storage element 22. A fuel supply system 31 whose downstream side is branched is connected to the regenerative burners A1 and B1, and a flow control valve 41 and air supply valves 51 and 52 are interposed in the fuel supply system 31. Further, a combustion air supply system 32 whose downstream side is branched is connected to the regenerating burners A1 and B1, and the combustion air supply system 32 is connected to a flow control valve 42 and air supply valves 53 and 54.
Is interposed. Further, an exhaust system 33 whose upstream side is branched is connected to the regenerating burners A1 and B1, and a flow control valve 43 and exhaust valves 55 and 56 are interposed in the exhaust system 33. Open the supply valves 52, 53 and the exhaust valve 55,
The air supply valves 51 and 54 and the exhaust valve 56 are closed to burn the regenerative burner A1, and the exhaust gas is discharged to the regenerative burner B1.
So that the heat of the exhaust gas is stored in the heat storage body 22, and the next time the regenerative burner B1 is burned, the combustion air is preheated by the heat storage body 22 that has stored the heat. I have. The same applies to other regenerative burners A2 to A4 and B2 to B4 whose illustration and description are omitted.

FIG. 2 shows a case in which each of the regenerative burners is sequentially burned one by one to perform a thinning operation. in this case,
First, while the other regenerative burners are stopped, the regenerative burner A1 is burned, and the exhaust gas is sucked into the regenerative burner B1 (solid arrow a in FIG. 2). Next, while the other regenerative burners are at rest, regenerative burner B
1 is burned, and the exhaust gas is sucked into the regenerative burner A2 (broken arrow b in FIG. 2). Further, with the other regenerative burners stopped, the regenerative burner A2 is burned, and the exhaust gas is sucked into the regenerative burner B2 (dashed arrow c in FIG. 2). Hereinafter, similarly, the regenerating burner B
2, A3, B3, A4, and B4 are sequentially burned (dashed arrows d to g in FIG. 2), and the exhaust gas when burning the regenerative burner B4 is sucked into the regenerative burner A1 (FIG. 2).
Broken arrow h) in the middle. The following is the repetition, but each regenerative burner is always in a state of being terminated by combustion at the time of switching.

FIG. 3 shows a case where two regenerative burners are sequentially burned to perform a thinning operation. in this case,
First, with the other regenerative burners stopped, the regenerative burners A1 and A2 are burned, and the exhaust gas is sucked into the regenerative burners B1 and B2 (solid arrow p in FIG. 3). Next, with other regenerative burners paused,
The regenerative burners B1 and B2 are burned, and the exhaust gas is sucked by the regenerative burners A3 and A4 (broken arrow q in FIG. 3). Further, while the other regenerative burners are stopped, the regenerative burners A3 and A4 are burned, and the exhaust gas is sucked into the regenerative burners B3 and B4 (broken arrow r in FIG. 3). Then, while the other regenerative burners are stopped, the regenerative burners B3 and B4 are burned, and the exhaust gas is sucked by the regenerative burners A1 and A2 (dashed arrow s in FIG. 3). The following is the repetition, but also in this case, each regenerative burner is always in a state of being terminated by combustion at the time of switching.

[0013]

As is apparent from the above description, according to the present invention described above, when a plurality of regenerative burners are sequentially switched to perform a thinning operation, each of the regenerative burners is always terminated by combustion at the time of the switching. This has the effect of preventing the deterioration of the device.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a thinning operation method according to the present invention in a longitudinal section in a furnace width direction.

FIG. 2 is a schematic view showing the same thinning operation method as in FIG. 1 in a cross section in a furnace length direction.

FIG. 3 is a schematic view showing another thinning operation method according to the present invention in a cross section in a furnace length direction.

[Explanation of symbols]

11: heating furnace, 21, 22, ... heat storage body, 51 to 5
4: Air supply valve, 55, 56: Exhaust valve, A1 to A
4, B1 to B4 ... regenerative burner

Claims (1)

[Claims] 1. A method in which a part of a regenerative burner is burned in a state where a regenerative burner which is not involved in combustion of a burner and suction of the exhaust gas is left, and the exhaust gas is sucked in another part of the regenerative burner. A regenerating burner thinning operation method in which operations are sequentially switched, wherein each regenerating burner is terminated by combustion at the time of the switching.