JPH08338625A - Operation method of heat storage type burner - Google Patents

Abstract

PURPOSE: To obtain an operation method of a heat storage type burner that achieves effective use of combusted waste gas heat and uniformization of temperature distribution in a furnace. CONSTITUTION: An operation method of a heat storage type burner is constructed as follows. A plurality of sets of paired heat storage type burners 10 are disposed on an opposing furnace wall 20. M burners among burners provided on one wall surface are combusted, and the total amount of waste gas is sucked into N burners among the burners provided on the other wall surface, and waste gas heat is stored in its heat storage unit 12 and is exhausted to the outside of the furnace. After a predetermined time the sucking N burners are burned which are sucked by the other burning M burners. Further, after the lapse of a predetermined time the M burners are combusted which are sucked by other N burners stopped in operation among the burners provided on the other wall surface. Furthermore, after the lapse of a predetermined time the sucking N burners are combusted waste gas of which being sucked by the burning M burbners. The process is repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a regenerative burner for uniformizing temperature distribution in a furnace.

[0002]

2. Description of the Related Art Conventionally, when the inside of a furnace is heated by a plurality of burners, the combustion exhaust gas of each burner is discharged from the burner to the flue through a substantially constant path to the outside of the furnace. In some cases, there was a low temperature region where the gas in the furnace stayed and the material could not be heated uniformly. by the way,
In recent years, various heat storage type burners provided with a heat storage device have been proposed. As shown in FIG. 2, this regenerative burner generally has
Two sets of two groups A ₁ , B ₁ and A ₂ , B _{2 are} provided facing the furnace wall 1, and one burner A ₁ , B ₂ is burning while the other burner A ₂ , B ₁ is burning. The exhaust gas is sucked through the regenerator (not shown) to recover the exhaust heat, and then the combustion and heat storage states are switched to preheat the combustion air by the regenerator. At the same time, the flow (path) of the combustion exhaust gas is changed to make the temperature distribution in the furnace more uniform as compared with the conventional heating method. Although the figure shows the case where two sets of heat storage type burners are provided, the number of sets may be more than that.

However, the gas flow in the furnace is almost as shown by the arrows, and even if these are synthesized, the flow velocity in the central part of the furnace is slow, that is, even if the regenerative burner is used, It was found that the gas retention area was not eliminated and the temperature inside the furnace could not be made uniform. Therefore, the present invention changes the combustion and the number of heat storage bases of the regenerative burner to further change the gas flow in the furnace to minimize the retention area of the in-furnace gas, thereby making the temperature distribution in the furnace uniform. The purpose is to provide a driving method.

[0004]

According to the present invention, in order to achieve the above object, a plurality of pairs of regenerative burners are installed on opposing furnace walls, and one of the burners provided on one furnace wall is M. The base burner is burned, the total amount of exhaust gas is sucked by the N burners of the burners provided on the other furnace wall, the exhaust gas heat is stored in the regenerator, and then exhausted to the outside of the furnace, and after a certain period of time, The sucked N burners are burned and sucked by the other burned M burners, and after a lapse of a certain time, the burned M burners are burned on the other furnace wall. A step of sucking with another N burner which has been stopped, and after a certain period of time, burning the sucked N burner and sucking the exhaust gas with the burned M burner Is to be repeated.

[0005]

EXAMPLE An example of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 10 denotes a known heat storage type burner (hereinafter referred to as a burner), which includes a burner body 11 and a heat storage unit 12, and the burner body 11 includes a fuel supply pipe 16
And the air pipes 17 and 18 of which the other end is connected to the heat accumulator 12 are respectively connected. Further, the fuel supply pipe 16 is connected to the fuel tank 13 via the switching valve V ₁ , and the heat accumulator 12 is connected to the blower fan 14 and the suction fan 15 via the switching valves V ₂ and V ₃ provided in the air pipes 17 and 18. Communicate with each. A heat storage material such as alumina balls is stored in the heat storage device 12. In the figure, the burner 10 having the above-described structure is installed so as to face the furnace wall 20 and two sets A ₁ , B ₁ and A ₂ , B ₂ are installed.

The burners operate as follows. (First operation) Open the switching valves V ₁ and V ₂ of the burners A ₁ and A ₂ ,
₃ is closed, the fuel is supplied from the fuel tank 13, and the air is supplied from the blower fan 14 via the heat accumulator 12 to the burner body 11
To burn these burners. On the other hand, the changeover valves V ₁ and V ₂ of the burner B ₁ are closed and V ₃ is opened so that the burners A ₁ and A
The total amount of the combustion exhaust gas _{No. 2} is sucked and exhausted by the suction fan 15 through the heat storage unit 12 of the burner B ₁ . Incidentally, all said switching valve V ₁ ~V ₃ of the burner B ₂ in the closed, its operation is stopped [Figure 1 (b)].

(Second operation) When the exhaust gas heat is sufficiently stored in the heat storage material of the burner B ₁ after a lapse of a predetermined time, as shown in FIG.
As shown in (b), the switching valves V ₁ and V ₂ of the burner B ₁ are opened and V ₃ is closed, and the combustion air is preheated by passing through the heat storage material to burn the burner. On the other hand, the switching valves V ₁ and V ₂ of the burners A ₁ and A ₂ are closed and V ₃ is opened, and the total amount of the combustion gas from the burner B ₁ is passed through the regenerator 12 of the burners A ₁ and A _2. The air is exhausted and the heat is stored in the heat storage material.

(Third operation) When a predetermined time has elapsed and the heat storage material of the burners A ₁ and A ₂ sufficiently stores heat, as shown in FIG. 1C, the switching valve V of the burners A ₁ and A _{2 1,} the V ₂ open, V
₃ is closed, the combustion of these burners A _1, A _2, switching valve V ₁ of the burner B _1, V _2, switching valve V ₁ of the burner B ₂ with the V ₃ stops in a closed, V ₂ and closed, the V ₃ to suck the whole amount of the combustion exhaust gas of the burner a _1, a ₂ are opened.

(Fourth operation) When a predetermined time has passed, the burners A ₁ and A ₂ are sucked, the burner B ₂ is burned, and the burner B ₁ is stopped (FIG. 1 (d)). Hereinafter, the above operation is repeated.

As is clear from the combustion exhaust gas flow shown in FIG. 1, its path is greatly changed as compared with that shown in FIG. Then, when the combustion exhaust gas flows in each of these figures are combined, it can be seen that there is almost no retention area of the in-furnace gas except for a very small central area in the incinerator.

After the fourth operation, the burners B ₁ and B ₂ may be set to A ₁ and A ₂ so that the flow of the combustion exhaust gas is reversed. In the above-described embodiment, the case where two and one burners burn and store heat is shown. However, the number of burners during combustion at a certain moment is M, and the number of burners during heat storage is N. The number of burners in No. 2 is N, and the number of burners in heat storage is M. However,
When M ≠ N, M and N are integers of 1 or more.

[0012]

As is apparent from the above description, according to the present invention, a plurality of pairs of regenerative burners are installed on the opposing furnace walls, and one of the burners provided on one furnace wall has M groups. Of the burner and N burners of the burners provided on the other furnace wall are alternately burned and sucked to change the combustion exhaust gas flow in the furnace in a complicated manner, so that there is almost no retention area in the furnace.
The temperature distribution can be made uniform. Further, since the burner is a heat storage type, the heat quantity of the exhaust gas can be effectively used and energy can be saved.

[Brief description of drawings]

1 (a), (b), (c), and (d) show the arrangement of a heat storage burner to which the present invention is applied and the combustion heat storage state and combustion exhaust gas flow distribution of the burner by switching the burners.

FIG. 2 shows a combustion heat storage state and a combustion exhaust gas flow distribution of a burner when the heat storage type burner is arranged and the burner is switched in the conventional example.

[Explanation of symbols]

10, A ₁ , A ₂ , B ₁ , B ₂ ... Regenerative burner, 11 ... Burner body, 12 ... Regenerator, 13 ... Fuel source, 14 ... Blower fan, 15 ... Suction fan, 16 ... Fuel supply pipe, 17 , 18
... air tube, 20 ... furnace wall, V ₁ ~V ₃ ... changeover valve.

Claims (1)

[Claims] 1. A plurality of pairs of heat storage type burners are installed on opposing furnace walls, and M burners out of the burners provided on one furnace wall are burned, and the total amount of exhaust gas is taken from the other furnace wall. Among the burners provided in the above, the N burners are sucked, the exhaust gas heat is stored in the regenerator and then discharged to the outside of the furnace, and after a certain period of time, the sucked N burners are burned to burn the other The burner of the M group which had been operated, and after a certain period of time, burned the burner of the M group, which was burned by another burner of the N group which was out of operation among the burners provided on the other furnace wall. The method for operating a heat storage burner, further comprising: after a certain period of time, repeating the step of burning the sucked N burners and sucking the exhaust gas with the burned M burners. (M ≠ N, where M and N are integers of 1 or more)