JP2009276024A - Regenerative burner control method and control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method and a control system for uniformly heating the whole interior of a furnace in regard to regenerative burners composed of four burners provided vertically and laterally at the rear part of a furnace body. <P>SOLUTION: The method is provided for controlling the combustion of two sets of regenerative burners 1 in a furnace 10 such as a heating furnace or a heat treatment furnace of metal or nonferrous metal in which two sets of regenerative burners 1, that is, two burners 2 arranged in total on the sides and up and down, are used for alternately firing two burners 2 used as a pair, accumulating waste heat obtained by firing one burner, in a heat accumulator of the other burner, and using the waste heat when firing the other burner. In this method, a combination of two burners 2 used as the pair out of the four burners 2 is switched being suitably selected from the combinations of two burners 2 located in vertical, lateral and oblique directions. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for controlling a regenerative burner configured by providing at least four burners in a furnace body of an industrial furnace such as a metal or non-ferrous metal heating furnace or heat treatment furnace, and a system for controlling the regenerative burner. is there.

  Conventionally, in a general industrial furnace such as a metal or non-ferrous metal heating furnace or a heat treatment furnace, as shown in FIG. A regeneration burner 11 is used in which 12a and 12b are an upper pair and the lower two burners 12c and 12d are a lower pair.

This regenerative burner 11 alternately burns the two burners 12a and 12b located on the left and right of the upper pair, and sends the high-temperature exhaust heat generated by the combustion of one burner 12a to the other burner 12b side to generate heat. The stored exhaust heat is used when the other burner 12b is burned, and at the same time, the two burners 12c and 12d located on the left and right of the lower pair are alternately burned to burn one burner 12c. The high-temperature exhaust heat generated in step 1 is sent to the other burner 12d to store heat, and the stored exhaust heat is used to burn the other burner 12d.
The regenerative burner 11 configured as described above has a feature that combustion efficiency is high.

However, this conventional regenerative burner 11 burns alternately only between the two burners 12a and 12b of the upper pair and between the two burners 12c and 12d of the lower pair of burners 12c and 12d. As shown in FIG. 5, the flow F of hot air is limited only in the left-right direction.
Therefore, the location where the flow F of the hot air is small is generated, and the low temperature region L is generated there, thereby causing a problem that the entire inside of the furnace is not uniformly heated.

  Accordingly, an object of the present invention is to provide a control method capable of uniformly heating the entire interior of a furnace in a regenerative burner configured by providing at least four burners on the furnace body in the vertical and horizontal directions. There is to do.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that two burners (2) forming a pair are alternately burned, and waste heat obtained by combustion of one burner is used as the other burner. The regenerator burner (1) used when the other burner is burned, and the waste heat is stored in a heat accumulator of two, a total of four burners (2), a metal in which each of the four burners (2) is arranged vertically and horizontally or In a furnace (10) such as a non-ferrous metal heating furnace or a heat treatment furnace, the method controls combustion of the two sets of regenerative burners (1),
Of the four burners (2), the combination of the two burners (2) forming the pair is appropriately selected from the combination of the two burners (2) positioned in the vertical, left and right, and diagonal directions. It is characterized by selecting and switching.

  The invention according to claim 2 is characterized in that the combination of the two burners (2) forming the pair of pairs is switched every predetermined time.

  Furthermore, the invention described in claim 3 is characterized in that the combination of the two burners (2) forming the pair is switched according to the temperature in the furnace.

Further, the invention according to claim 4 alternately burns the two burners (2) that form a pair, and stores the waste heat obtained by the combustion of one burner in the regenerator of the other burner, Metal or non-ferrous metal heating furnace or heat treatment in which two sets of regenerative burners (1) used for burning the other burner, the four burners (2) are arranged vertically and horizontally In a furnace (10) such as a furnace, the system controls combustion of the two sets of regenerative burners (1),
Of the four burners (2), the combination of the two burners (2) forming the pair is appropriately selected from the combination of the two burners (2) positioned in the vertical, left and right, and diagonal directions. It is characterized by being selectable and switchable.

  Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and the best mode for carrying out the invention described later.

According to the first aspect of the present invention, in the method of controlling a regenerative burner in which the four burners are respectively arranged vertically and horizontally at the rear of the furnace body, a pair of the four burners is paired. The combination of the two burners is set to burners positioned in the vertical, horizontal, and diagonal directions, so the flow of hot air in the furnace is set to two in the vertical, horizontal, and diagonal directions. Therefore, the flow of hot air can be supplied to the entire interior of the furnace.
Therefore, unlike the prior art, a low temperature region is not formed, and the entire inside of the furnace can be heated uniformly.

  Further, according to the invention described in claim 2, in addition to the function and effect of the invention described in claim 1, the combination of two burners forming a pair is changed every predetermined time. It is possible to reliably supply a flow of hot air to the whole. Thereby, the whole inside of a furnace can be heated more uniformly.

  Further, according to the invention described in claim 3, in addition to the function and effect of the invention described in claim 1, the combination of two burners that form a pair is changed according to the temperature in the furnace, for example, the temperature. Therefore, the flow of hot air can be reliably supplied to the entire inside of the furnace. Thereby, the whole inside of a furnace can be heated more uniformly.

According to the fourth aspect of the present invention, in the system for controlling the regenerative burner configured by arranging the four burners in the upper, lower, left and right directions at the rear part of the furnace body, a pair of the four burners is controlled. The combination of the two burners that form a pair is appropriately set in the burners positioned in the vertical, horizontal, and diagonal directions, so that the flow of hot air in the furnace is positioned in the vertical, horizontal, and diagonal directions. Since it can be appropriately selected and switched from a combination of two burners, a flow of hot air can be supplied to the entire interior of the furnace.
Therefore, unlike the prior art, a low temperature region is not formed, and the entire inside of the furnace can be heated uniformly.

  With reference to FIG. 1 thru | or FIG. 4, the regeneration burner control method and control system which concern on embodiment of this invention are demonstrated. FIG. 1 is a schematic configuration diagram showing a regenerative burner 1 as a control system that implements the control method according to the present embodiment. Moreover, FIG. 2 thru | or FIG. 4 is explanatory drawing which shows the regeneration burner control method which concerns on this embodiment. The same parts as those shown in the conventional example are denoted by the same reference numerals.

This regenerative burner control method and regenerative burner control system are configured by arranging four burners 2 vertically and horizontally at the rear of a furnace body 10 of a general industrial furnace such as a metal or non-ferrous metal heating furnace or heat treatment furnace. The two sets of regeneration burners 1 are controlled.
And this regeneration burner 1 chooses suitably the combination of two burners used as a pair among four burners from the combination of two burners located up and down, right and left, and diagonally. It is supposed to switch.

  Here, the regenerative burner 1 alternately burns the two burners 2 in a pair, stores the waste heat obtained by the combustion of one burner in the regenerator of the other burner, and stores the waste heat in the other burner. The burner is used for burning. In this embodiment, a combination of the two burners 2 forming a pair is selected from four burners and switched.

  In the present embodiment, as shown in FIG. 1, the two burners 2 arranged on the upper left and right sides of the furnace body 10 are respectively referred to as a first burner 2 a and a second burner 2 b, and the two burners 2 located on the lower left and right are The third burner 2c and the fourth burner 2d are used. Each burner 2 is connected to a fuel pipe 3 for supplying fuel, an air pipe 4 for supplying combustion air, and an exhaust heat pipe 5 for exhausting high-temperature exhaust heat. , 6 are provided with valves 6a, 6b, 6c that can control the flow rates of air, exhaust gas, and fuel according to the opening of the valve. The opening and closing of these valves 6a, 6b, 6c is controlled by a CPU (controller) 7. Also, each of the burners 2a, 2b, 2c, 2d has a shutoff valve 8a1, 8b1, 8c1, 8d1 for closing the fuel supply, a shutoff valve 8a2, 8b2, 8c2, 8d2 for closing the air supply, and exhaust gas. The shut-off valves 8a3, 8b3, 8c3, 8d3 for closing the discharge are provided, and two pairs of burners are selected from the four burners 2 by an on / off control signal from the CPU (controller) 7 inputted thereto. It is possible to select and control each burner as a regeneration burner.

  In the regenerative burner control method according to the present embodiment, a CPU (controller) 7 is controlled, for example, first, as shown in FIG. 2, a first burner 2a and a third burner 2c positioned on the top and bottom (left side) are paired. A pair of regenerative burners 1 is configured, and another pair of regenerative burners 1 is configured with another pair of the second burner 2b and the fourth burner 2d that are also located on the upper and lower sides (right side). Then, the two burners in each pair are alternately burned to form a hot air flow F in the vertical direction.

At this time, for example, as shown in FIG. 2A, first, the first burner 2a located on the upper left side of the furnace body 10 and the fourth burner 2d located on the lower right side of the furnace body 10 are simultaneously burned. (Here, the flame is indicated by the symbol H). At this time, the waste heat obtained by the combustion of the upper left burner 2a is stored in the regenerator of the lower left burner 2c, and the waste heat is used when the lower left burner 2c is burned, and the lower right burner 2d. The waste heat obtained by burning is stored in the regenerator of the upper right burner 2b, and the waste heat is used when the upper right burner 2b is burned.
Thereafter, as shown in FIG. 2 (b), the third burner 2 c located on the lower left side of the furnace body 10 and the second burner 2 b located on the upper right side of the furnace body 10 can be burned.

In this way, by burning the burner 2 located at the upper part of the furnace body 10 and the burner 2 located at the lower part at the same time, the flow F of hot air is generated in two directions from top to bottom and from bottom to top. be able to.
And when this two-way flow F partially crosses, hot air reaches every corner in a furnace, and, thereby, the whole inside of a furnace can be heated more uniformly.

  Next, as shown in FIG. 3, the first burner 2a and the fourth burner 2d positioned in the oblique direction constitute a pair of the regenerative burner 1, and the oblique direction is perpendicular to the oblique direction. Another set of regenerative burners 1 is configured with the second burner 2b and the third burner 2c positioned in the direction as another pair. Then, the two burners in each pair are alternately burned to form a flow F of hot air in an oblique direction.

At this time, for example, as shown in FIG. 3A, first, the fourth burner 2d located on the lower right side of the furnace body 10 and the second burner 2b located on the upper right side of the furnace body 10 are burned simultaneously. (Here, the flame is indicated by the symbol H). At this time, the waste heat obtained by the combustion of the lower right burner 2d is stored in the regenerator of the upper left burner 2a, and the waste heat is used to burn the upper left burner 2a, and the upper right burner 2b. The waste heat obtained by burning is stored in a heat accumulator of the lower left burner 2c, and the waste heat is used when the lower left burner 2c is burned.
Thereafter, as shown in FIG. 3B, the first burner 2 a located on the upper left side of the furnace body 10 and the third burner 2 c located on the lower left side of the furnace body 10 can be burned.

  In this way, by burning the burner 2 located at the upper part of the furnace body 10 and the burner 2 located at the oblique lower part at the same time, the hot air flow F is directed obliquely downward from above and obliquely upward from below. Therefore, the entire inside of the furnace can be heated more uniformly.

  Subsequently, as shown in FIG. 4, a pair of regenerative burners 1 is configured with a first burner 2 a positioned on the upper left side and a second burner 2 b positioned on the upper right side as a pair, and positioned on the lower right side. Another set of regeneration burners 1 is configured with the fourth burner 2d and the third burner 2c located on the lower left side as another pair. Then, the two burners of each pair are alternately burned to form a hot air flow F in the left-right direction.

At this time, for example, as shown in FIG. 4A, first, the first burner 2a located on the upper left side of the furnace body 10 and the fourth burner 2d located on the lower right side of the furnace body 10 are simultaneously burned. (Here, the flame is indicated by the symbol H). At this time, the waste heat obtained by the combustion of the upper left burner 2a is stored in the regenerator of the upper right burner 2b, and the waste heat is used to burn the upper right burner 2b, and the lower right burner 2d. The waste heat obtained by burning is stored in a heat accumulator of the lower left burner 2c, and the waste heat is used when the lower left burner 2c is burned.
Thereafter, as shown in FIG. 4B, the second burner 2a located on the upper right side of the furnace body 10 and the third burner 2c located on the lower left side of the furnace body 10 can be burned.

  In this way, by simultaneously burning the burner 2 located on the left side of the furnace body 10 and the burner 2 located on the right side, the flow F of hot air is changed in two directions from left to right and from right to left. Since it can generate | occur | produce, the whole inside of a furnace can be heated more uniformly.

  In this manner, the combustion of the burner 2 is controlled by appropriately selecting the combination of the regenerative burner 1 as a pair of burners 2 by on / off control from the upper, lower, diagonal, and left and right combinations. The flow F can be sequentially changed in the vertical direction, the diagonal direction, and the horizontal direction, and the entire inside of the furnace can be uniformly heated without generating a low temperature region.

In addition, the combination of the two burners 2 used as a pair of regeneration burner 1 can be manually set by pushing a touch panel screen with a finger, and can also be switched easily. In addition, for example, by changing automatically to a combination such as up / down, diagonal, left / right at every predetermined time by automatic control at every predetermined time, or by temperature modulation in the furnace, for example, a change in temperature has a predetermined displacement width. When it exceeds, it can also be changed by switching to a combination of up / down, diagonal, left / right.
In addition, regarding the control of the combination of the two burners 2 that form a pair of the regenerative burner 1, the three combinations of up, down, diagonal, left and right are automatically switched sequentially in sequence at predetermined time intervals or according to temperature modulation. Of course, only two combinations are selected from the three combinations, that is, the top / bottom and diagonal combinations are repeated, the top / bottom and left / right combinations are repeated, or the diagonal and left / right are repeated. These combinations may be repeated.

It is a schematic block diagram which shows the regeneration burner control system which enforces the regeneration burner control method which concerns on embodiment of this invention. In the regeneration burner control method concerning an embodiment of the present invention, it is an explanatory view showing the state where the flow of hot air is generated in the up-and-down direction. In the regeneration burner control method concerning the embodiment of the present invention, it is an explanatory view showing the state where the flow of hot air is generated in the slanting direction. It is explanatory drawing which shows the state which is generating the flow of hot air in the left-right direction in the regeneration burner control method which concerns on embodiment of this invention. It is explanatory drawing which shows the regeneration burner control method which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Regenerative burner 2 Burner 2a 1st burner 2b 2nd burner 2c 3rd burner 2d 4th burner 3 Fuel pipe 4 Air pipe 5 Waste heat pipe 6a, 6b, 6c Valve 7 CPU
8a1, 8a2, 8a3 shut-off valve 8b1, 8b2, 8b3 shut-off valve 8c1, 8c2, 8c3 shut-off valve 8d1, 8d2, 8d3 shut-off valve 10 furnace body 11 regeneration burner 12 burner 12a, 12b upper pair burner 12c, 12d lower pair burner F Hot air flow H Flame L Low temperature range

Claims (4)

Two burners in a pair are burned alternately, waste heat obtained by burning one burner is stored in the regenerator of the other burner, and the waste heat is used to burn the other burner This is a method for controlling the combustion of the two sets of regenerative burners in a furnace such as a metal or non-ferrous metal heating furnace or heat treatment furnace in which two sets of a total of four burners are arranged vertically and horizontally. And
Of the four burners, the combination of the two burners that form the pair of pairs is appropriately selected and switched from a combination of two burners positioned in the up, down, left, and right directions. Regenerative burner control method.   The regeneration burner control method according to claim 1, wherein a combination of the two burners forming the pair is switched every predetermined time.   The regeneration burner control method according to claim 1, wherein the combination of the two burners forming the pair is switched according to the temperature in the furnace. Two burners in a pair are burned alternately, waste heat obtained by burning one burner is stored in the regenerator of the other burner, and the waste heat is used to burn the other burner This is a system that controls the combustion of the two regenerative burners in a furnace such as a metal or non-ferrous metal heating furnace or heat treatment furnace, in which two sets of regenerative burners are arranged in the vertical and horizontal directions. And
Among the four burners, the combination of the two burners forming the pair of pairs can be appropriately selected and switched from a combination of two burners positioned in the up, down, left, and right directions. A regenerative burner control system.

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