TW201831830A - Regenerative burner device characterized by using the regenerator to recover the heat of the burned gas therein and heat the air used in combustion - Google Patents

Abstract

Disclosed is a regenerative burner device provided with a regenerator to recover the heat of the burned gas therein and heat the air used in combustion. The present regenerative burner device is characterized by having a main fuel pipe used to supply fuel and a plurality of air supply/discharge pipes arranged at the periphery of the main fuel pipe to supply air used in combustion and discharge the burned gas. In addition, the sub-fuel pipes used to supply fuel are individually installed in the proximity of each air supply/discharge pipe. Wherein, the main fuel pipe and the sub-fuel pipes can adjust the fuel supply amount, and the air supply/discharge pipes can adjust the supply amount of air used in combustion.

Description

Regenerative burner device

FIELD OF THE INVENTION The present invention relates to an invention of a regenerative burner apparatus.

BACKGROUND OF THE INVENTION Conventionally, in a combustion apparatus such as a heating furnace or a combustion furnace, in order to save energy, a heat storage body is provided in a burner to recover heat of combustion gas combusted in the furnace and to heat the combustion air. Regenerative burner devices are well known. Further, as shown in Patent Documents 1 and 2, there is a combustion apparatus in which a burner for supplying fuel and combustion air is disposed in the center of the furnace introduction portion, and combustion air is supplied and discharged around the burner. The exhaust gas of the burned combustion gas forms a main flame. Prior Technical Literature Patent Literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-024335. Patent Document 2: Japanese Patent Laid-Open No. 2010-127525

SUMMARY OF THE INVENTION Problems to be Solved by the Invention In these examples, a long flame is formed from the inside of the furnace by a jet of combustion air from the supply and exhaust pipe, and it is difficult to perform a desired heat treatment. Question.

Accordingly, in the present invention, it is an object of the invention to provide a regenerative burner device which can adjust the length or inclination of a flame. Means to solve the problem

The present invention relates to a regenerative burner device, comprising a heat storage body that recovers heat of combustion gas combusted in the furnace and heats combustion air, and the regenerative burner device is characterized by: a main fuel pipe for supplying fuel; and a plurality of supply and exhaust pipes disposed around the main fuel pipe to supply combustion air and discharge combustion gas, and each of the supply and exhaust pipes is provided with a supply separately The auxiliary fuel pipe of the fuel, the main fuel pipe and the auxiliary fuel pipe may adjust a fuel supply amount, and the supply and exhaust pipe may adjust a supply amount of combustion air.

According to the above configuration, since the air supply and exhaust pipe is disposed around the main fuel pipe and the sub fuel pipe is provided in the vicinity of the air supply and exhaust pipe, the main fuel can be used as the fuel is injected into the air supply from each of the air supply and exhaust pipes. tube. Further, since the main fuel pipe and the sub fuel pipe can adjust the fuel supply amount, and the supply and exhaust pipe can adjust the combustion air supply amount, the fuel supply amount from the main fuel pipe and the fuel supply amount from the auxiliary fuel pipe are adjusted. And the amount of combustion air supplied from the supply and exhaust pipe, the length or inclination of the flame can be adjusted.

The present invention further preferably has the following constitution. (1) The first supply and exhaust pipe and the second supply and exhaust pipe are provided in the exhaust pipe, and the main fuel pipe is disposed in the furnace opening, and the first supply and exhaust pipe is disposed in the furnace. An opening of the second fuel pipe is provided in the vicinity of the opening of the first supply and exhaust pipe in the vicinity of the opening of the first supply and exhaust pipe between the opening and the opening of the second supply and exhaust pipe in the furnace. An opening of the third fuel pipe in the furnace is provided in the vicinity of the opening of the second air supply and exhaust pipe, and the regenerative burner device is configured to provide the main fuel pipe when the combustion air is supplied to the first supply and exhaust pipe. And the second fuel pipe supplies fuel, the second supply and exhaust pipe recovers waste heat, the third fuel pipe does not supply fuel, and the main fuel pipe and the main fuel pipe are configured when the combustion air is supplied to the second supply and exhaust pipe The third fuel pipe supplies fuel, the first supply and exhaust pipe recovers waste heat, and the second fuel pipe does not supply fuel. (2) In the above configuration (1), the total fuel supply amount of the main fuel pipe, the second fuel pipe, and the third fuel pipe is fixed, and the fuel supply amount of the main fuel pipe is set. The fuel supply amount is larger than the fuel supply amount of the second fuel pipe or the third fuel pipe, and the length of the flame is lengthened as compared with when the fuel supply amount of the second fuel pipe or the third fuel pipe is the same. . (3) In the above configuration (1), the total fuel supply amount of the main fuel pipe, the second fuel pipe, and the third fuel pipe is fixed, and the fuel supply amount of the main fuel pipe is set. The amount of fuel supplied is smaller than the fuel supply amount of the second fuel pipe or the third fuel pipe, and the flame is increased as compared with when the fuel supply amount of the second fuel pipe or the third fuel pipe is equal to or greater than that of the second fuel pipe or the third fuel pipe. tilt. (4) In any one of the above-mentioned configurations (1) to (3), the second fuel pipe is configured to be opened in the furnace, and supplies fuel to the opening of the furnace toward the first supply and exhaust pipe. The third fuel pipe is configured to be opened in the furnace and to supply fuel to the opening of the furnace toward the second supply and exhaust pipe. (5) The second fuel pipe is configured to be open in the first supply and exhaust pipe and to supply fuel into the first supply and exhaust pipe in any one of the above-described configurations (1) to (3) The third fuel pipe is configured to be opened in the second supply and exhaust pipe and to supply fuel into the second supply and exhaust pipe. (6) In the above configuration (4) or (5), the opening of the second fuel pipe is located on the opposite side of the opening of the main fuel pipe with respect to the opening of the first supply and exhaust pipe The opening of the third fuel pipe is located on the opposite side of the opening of the main fuel pipe with respect to the opening of the second supply and exhaust pipe. (7) A first air pipe is provided, and the first air pipe supplies combustion air into the main fuel pipe.

According to the above configuration (1), the combustion air is alternately supplied between the first supply and exhaust pipe and the second supply and exhaust pipe, and is fitted between the second fuel pipe and the third fuel pipe. Since the fuel is supplied, by adjusting the fuel supply amount from the main fuel pipe and the fuel supply amount from the second fuel pipe and the third fuel pipe, the amount of combustion can be maintained and the length or inclination of the flame can be adjusted.

According to the above configuration (2), the fuel supply amount of the main fuel pipe is set to be larger than the fuel supply amount of the second fuel pipe or the third fuel pipe, and the second fuel pipe or the third fuel pipe is provided. When the fuel supply amount is the same, the length of the flame can be lengthened.

According to the above configuration (3), the fuel supply amount of the main fuel pipe is set to be smaller than the fuel supply amount of the second fuel pipe or the third fuel pipe, and is set to be the second fuel pipe or the third fuel pipe. When the fuel supply amount is equal to or higher than the above, the inclination of the flame can be increased.

According to the above configuration (4), since the combustion air is mixed with the fuel and burned in the furnace, and then mixed with the fuel of the main fuel pipe and burned, the time of forming the flame can be divided into two times. The flame temperature is lowered, and as a result, the amount of NOx generated can be reduced.

According to the above configuration (5), since the flame is formed in the first supply and exhaust pipe and in the second supply and exhaust pipe, the flame state in the furnace can be further stabilized.

According to the above configuration (6), the mixing time of the fuel from the main fuel pipe and the combustion air is delayed with respect to the mixing timing of the fuel and the air from the second fuel pipe and the third fuel pipe, whereby the flame temperature can be made Lowering, the result is that the amount of NOx generated can be reduced. Moreover, it is easy to ensure the arrangement area of the second fuel pipe and the third fuel pipe, and it is easy to design the inclination angles of the second fuel pipe and the third fuel pipe to the furnace wall or the supply and exhaust pipe.

According to the above configuration (7), since the flame is formed in the main fuel pipe, the flame state in the furnace can be made more stable. Effect of the invention

In summary, in accordance with the present invention, a regenerative burner apparatus that can adjust the length or inclination of the flame can be provided.

(Embodiment) FIG. 1 is a schematic cross-sectional schematic view of a regenerative burner device 10 according to an embodiment of the present invention. As shown in Fig. 1, the regenerative burner device 10 includes a main fuel pipe 1 and fuel supply, and two or more supply and exhaust pipes 21 and 22 disposed around the main fuel pipe 1, and are supplied with combustion air side by side. Put the combustion gas.

The main fuel pipe 1 is configured to supply fuel into the furnace interior S, and one end is connected to the furnace interior S. The supply and exhaust pipes 21 and 22 are configured to supply combustion air into the furnace interior S, and one end communicates with the furnace interior S. The main fuel pipe 1 is provided with a regulating valve 11, which switches the main fuel pipe 1 to adjust the fuel supply amount. The supply and exhaust pipes 21, 22 are inclined toward the furnace S so as to be close to the main fuel pipe 1. It is preferable that the exhaust pipes 21 and 22 are inclined at about 10 degrees in advance.

Further, a second fuel pipe 3 and a third fuel pipe 4 that supply fuel to the furnace S are provided. The second fuel pipe 3 is provided in the vicinity of the supply and exhaust pipe 21, and has an opening portion 31 facing the furnace interior S in the vicinity of the opening 21a of the furnace S in the supply and exhaust pipe 21. The second fuel pipe 3 is configured to supply fuel to the opening 21a of the exhaust pipe 21. The inner diameter of the second fuel pipe 3 is smaller than the inner diameter of the supply and exhaust pipe 21. The second fuel pipe 3 is provided with an adjustment valve 32 that switches the second fuel pipe 3 to adjust the fuel supply amount.

The third fuel pipe 4 is provided in the vicinity of the supply and exhaust pipe 22, and has an opening portion 41 facing the furnace interior S in the vicinity of the opening portion 22a of the furnace S in the supply and exhaust pipe 22. The third fuel pipe 4 is configured to supply fuel to the opening 22a of the exhaust pipe 22. The inner diameter of the third fuel pipe 4 is smaller than the inner diameter of the supply and exhaust pipe 22. The third fuel pipe 4 is provided with an adjustment valve 42 that switches the third fuel pipe 4 to adjust the fuel supply amount.

The other end of the supply and exhaust pipe 21 is in communication with the supply and exhaust chamber 211. The heat storage body 212 is disposed in the supply and exhaust chamber 211. Similarly, the other end of the supply and exhaust pipe 22 communicates with the supply and exhaust chamber 221. The heat storage body 222 is disposed in the supply and exhaust chamber 221 .

Fig. 2 is a schematic view of the regenerative burner device 10 as seen from the side S of the furnace. As shown in FIG. 2, the main fuel pipe 1 is disposed at the center, the supply and exhaust pipe 21 is disposed to the left of the main fuel pipe 1, and the supply and exhaust pipe 22 is disposed to the right of the main fuel pipe 1. The second fuel pipe 3 is disposed on the left side of the exhaust pipe 21, and the third fuel pipe 4 is disposed on the right side of the exhaust pipe 22. Further, the second fuel pipe 3, the supply and exhaust pipe 21, the main fuel pipe 1, the supply and exhaust pipe 22, and the third fuel pipe 4 are arranged in a line from the left to the right.

The distance L1 between the second fuel pipe 3 and the supply and exhaust pipe 21 is smaller than the distance L2 between the exhaust pipe 21 and the main fuel pipe 1. It is desirable that the distance L1 is less than half of the distance L2. Similarly, the distance L3 between the third fuel pipe 4 and the supply and exhaust pipe 22 is smaller than the distance L4 between the exhaust pipe 22 and the main fuel pipe 1. It is desirable that the distance L3 is less than half of the distance L4. Furthermore, the distance L1 is equal to the distance L3, and the distance L2 is equal to the distance L4.

As shown in FIG. 1, the supply and exhaust chamber 211 is connected to the air-to-exhaust gas switching device 61 through a pipe 51, and the supply and exhaust chamber 221 is also connected to the air-to-air switching device 61 through the pipe 52 in the same manner. The supply and exhaust chamber 211 and the pipe 51 are connected via the flange 213, and the supply and exhaust chamber 221 and the pipe 52 are connected via the flange 223. The piping 51 is provided with a regulating valve 511 that switches the piping 51 to adjust the amount of supply of combustion air, and the piping 52 is provided with an adjustment valve 521 that switches the piping 52 to adjust the combustion. Air supply. The air-to-exhaust gas switching device 61 is connected to the air supply pipe 62 and the exhaust gas discharge pipe 63, and includes a switching valve 61a that communicates the air supply pipe 62 with the pipe 51 or the pipe 52, and simultaneously causes the exhaust gas discharge pipe 63 and The piping 52 or the piping 51 is in communication. An air supply blower (not shown) for supplying combustion air is provided in the air supply pipe 62, and an exhaust fan (not shown) for exhausting the combustion exhaust gas is provided in the exhaust gas discharge pipe 63.

3 and 4 are views for explaining switching of the air-to-air switching device 61. In FIG. 3, the switching valve 61a of the air-to-exhaust gas switching device 61 causes the air supply pipe 62 to communicate with the pipe 51, and causes the exhaust gas discharge pipe 63 to communicate with the pipe 52. As a result, the combustion air from the air supply pipe 62 passes through the pipe 51, is heated by the heat storage body 212 of the supply and exhaust chamber 211, and is then ejected from the supply and exhaust pipe 21 into the furnace S. Further, the combustion exhaust gas from the furnace S passes through the supply and exhaust pipe 22 by the exhaust fan provided in the exhaust gas discharge pipe 63, and the residual heat is recovered and stored by the heat storage body 222 of the supply and exhaust chamber 221. It is discharged from the exhaust gas discharge pipe 63 through the pipe 52.

On the other hand, in FIG. 4, the switching valve 61a of the air-to-air switching device 61 causes the air supply pipe 62 to communicate with the pipe 52, and causes the exhaust gas discharge pipe 63 to communicate with the pipe 51. As a result, the combustion air from the air supply pipe 62 passes through the pipe 52, is heated by the heat storage body 222 of the supply and exhaust chamber 221 that has been stored, and is then ejected from the supply and exhaust pipe 22 into the furnace S. Further, the combustion exhaust gas from the furnace S passes through the supply and exhaust pipe 21 by the exhaust fan provided in the exhaust gas discharge pipe 63, and the residual heat is recovered and stored by the heat storage body 212 of the supply and exhaust chamber 211. It is discharged from the exhaust gas discharge pipe 63 through the pipe 51.

As described above, by switching the switching valve 61a of the air-to-exhaust gas switching device 61 between FIG. 3 and FIG. 4, it is possible to alternately repeat the combustion air between the supply and exhaust pipe 21 and the supply and exhaust pipe 22. The exhaust gas supplied to the combustion exhaust gas is recovered by the heat regenerators 212 and 222 of the combustion exhaust gas which is burned in the furnace S, and the combustion air is heated by the heat recovered by the heat storage bodies 212 and 222.

The present invention is configured to mix the fuel from the second fuel pipe 3 in the furnace S when the combustion air is supplied from the supply and exhaust pipe 21 into the furnace S and the combustion exhaust gas is discharged from the furnace S to the supply and exhaust pipe 22. A flame is formed with the combustion air from the supply and exhaust pipe 21, and a flame is further formed by the flame and the fuel from the main fuel pipe 1. Further, when the combustion air is supplied from the air supply and exhaust pipe 22 to the furnace S and the combustion gas is recovered from the furnace S to the air supply and exhaust pipe 21, the fuel from the third fuel pipe 4 is mixed in the furnace S. A flame is formed with the combustion air from the supply and exhaust pipe 22, and a flame is further formed by the flame and the fuel from the main fuel pipe 1.

The regenerative burner device 10 is configured to operate as follows.

5A to 5C and FIGS. 6A and 6B are diagrams showing that the total fuel supply amount supplied to the furnace S is fixed (for example, 4 million kcal/h), and the main fuel pipe 1, the second fuel pipe 3, and the 3 is a schematic cross-sectional view showing a state in which a flame is supplied when the fuel supply amount of the fuel pipe 4 is changed. In addition, in these figures, the supply and exhaust chambers 211 and 221 are omitted. Further, the amount of combustion air here is set to an amount supplied for the coordinated combustion. In addition, each of FIGS. 5A to 6B shows a state in which the combustion air is supplied from the supply and exhaust pipe 21 and the combustion gas is discharged from the supply and exhaust pipe 22, and the flame is supplied when the combustion air is supplied and the exhaust gas of the combustion gas is switched. The status is shown with a dotted line.

As shown in FIG. 5A, the opening degree of the regulating valve 11 is set to be fully open, and all the fuel (4 million kcal/h) is supplied from the main fuel pipe 1, and the regulating valves 32, 42 are closed to bring the second fuel pipe 3 and The fuel supply amount of the third fuel pipe 4 is zero. Further, the supply of the combustion air from the supply and exhaust pipe 21, the exhaust gas from the combustion gas from the exhaust pipe 22, the supply of the combustion air from the supply and exhaust pipe 22, and the supply and exhaust pipes are alternately repeated. Exhaust gas of 21 combustion gases. At this time, the flame extends substantially straight toward the inside of the furnace, and the length F1 of the flame is the longest compared with FIG. 5B and FIG. 5C which will be described later.

As shown in FIG. 5B, the opening degree of the adjustment valve 11 is set to a fixed amount to supply fuel (for example, 3 million kcal/h) exceeding half of the total fuel supply amount from the main fuel pipe 1, and the opening of the regulating valve 32 is turned on. The degree of opening is fixed to supply the remaining fuel (for example, 1 million kcal/h) from the second fuel pipe 3, and the regulating valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Further, combustion air is supplied from the supply and exhaust pipe 21, and exhaust gas of the combustion gas is supplied from the supply and exhaust pipe 22. At this time, on the paper surface, the flame extends from the upper portion toward the lower portion (right to left in FIG. 2) and becomes longer, and the length F2 of the flame is shorter than that of FIG. 5A.

As shown in FIG. 5C, the opening degree of the adjustment valve 11 is set to a fixed amount to supply the fuel (2 million kcal/h) which is half of the total fuel supply amount from the main fuel pipe 1, and the opening degree of the adjustment valve 32 is set to When a fixed amount is turned on, fuel (2 million kcal/h) which is half of the total fuel supply amount is supplied from the second fuel pipe 3, and the adjustment valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Further, combustion air is supplied from the supply and exhaust pipe 21, and exhaust gas of the combustion gas is supplied from the supply and exhaust pipe 22. At this time, on the paper surface, the flame extends from the upper portion toward the lower portion (the right side to the left side in FIG. 2) to have a substantially uniform length, and the flame length F3 is the shortest compared to FIGS. 5A and 5B.

As shown in FIG. 6A, the opening degree of the adjustment valve 11 is set to a fixed amount to supply fuel (for example, 1 million kcal/h) lower than the entire fuel supply amount from the main fuel pipe 1, and the valve 32 is adjusted. The opening degree is set to a fixed amount, and the remaining fuel (for example, 3 million kcal/h) is supplied from the second fuel pipe 3, and the regulating valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Further, combustion air is supplied from the supply and exhaust pipe 21, and exhaust gas of the combustion gas is supplied from the supply and exhaust pipe 22. At this time, on the paper surface, the flame is inclined toward the lower side of the furnace (to the left in FIG. 2) as compared with FIG. 5B, and the length F4 of the flame is substantially the same as the length F2 of the flame of FIG. 5B. Degree.

As shown in FIG. 6B, the operation of alternately opening the adjustment valve 32 to the full opening to supply all the fuel (4 million kcal/h) from the second fuel pipe 3, and from the supply and exhaust pipe 21 is alternately repeated. The operation of supplying the combustion air (and discharging the combustion gas from the supply and exhaust pipe 22) and the opening degree of the adjustment valve 42 are fully opened, and all the fuel (4 million kcal/h) is supplied from the third fuel pipe 4, and The operation of supplying combustion air from the exhaust pipe 22 (and discharging the combustion gas from the supply and exhaust pipe 21). Further, the adjustment valve 11 is closed, and fuel supply from the main fuel pipe 1 is not performed. At this time, on the paper surface, the flame will be inclined toward the bottom or the upper side of the furnace (left or right in FIG. 2) as compared with FIG. 6A, and the flame length F5 will become the flame of FIG. 5A. The length of F1 is approximately the same.

7A to 7C and Figs. 8A and 8B show that the total fuel supply amount supplied to the furnace S is the same, and the fuel supply amount is set to twice the fuel supply amount of Figs. 5A to 5C and Figs. 6A and 6B ( A schematic cross-sectional view showing a state in which the flame is supplied from the main fuel pipe 1, the second fuel pipe 3, and the third fuel pipe 4 when the amount of fuel supplied from the main fuel pipe 1, the second fuel pipe 3, and the third fuel pipe 4 is changed. In addition, in these figures, the supply and exhaust chambers 211 and 221 are omitted. Further, the amount of combustion air here is set to an amount supplied for the coordinated combustion. In addition, in FIGS. 7A to 8B, the flame is supplied from the supply and exhaust pipe 21, and the combustion gas is discharged from the supply and exhaust pipe 22, and the flame is supplied when the combustion air is supplied and the exhaust gas of the combustion gas is switched. The status is shown with a dotted line.

As shown in FIG. 7A, the opening degree of the regulating valve 11 is set to be fully open, and all the fuel (8 million kcal/h) is supplied from the main fuel pipe 1, and the regulating valves 32, 42 are closed to bring the second fuel pipe 3 and The fuel supply amount of the third fuel pipe 4 is zero. Further, the supply of the combustion air from the supply and exhaust pipe 21, the exhaust gas from the combustion gas from the exhaust pipe 22, the supply of the combustion air from the supply and exhaust pipe 22, and the supply and exhaust pipes are alternately repeated. Exhaust gas of 21 combustion gases. At this time, the flame extends substantially straight toward the inside of the furnace, and the length of the flame is the longest compared with FIG. 7B and FIG. 7C which will be described later. Further, the length F6 of the flame at this time becomes longer than the length F1 of the flame of FIG. 5A.

As shown in FIG. 7B, the opening degree of the adjustment valve 11 is set to a fixed amount to supply fuel (for example, 6 million kcal/h) exceeding half of the total fuel supply amount from the main fuel pipe 1, and the opening of the regulating valve 32 is opened. The degree of opening is fixed to supply the remaining fuel (for example, 2 million kcal/h) from the second fuel pipe 3, and the regulating valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Further, combustion air is supplied from the supply and exhaust pipe 21, and exhaust gas of the combustion gas is supplied from the supply and exhaust pipe 22. At this time, on the paper surface, the flame extends from the upper portion toward the lower portion (right to left in FIG. 2) and becomes longer, and the length of the flame is shorter than that of FIG. 7A. Further, the length F7 of the flame at this time becomes longer than the length F2 of the flame of FIG. 5B.

As shown in FIG. 7C, the opening degree of the adjustment valve 11 is set to a fixed amount, and the fuel (half million kcal/h) of the entire fuel supply amount is supplied from the main fuel pipe 1, and the opening degree of the adjustment valve 32 is set to When a fixed amount is turned on, fuel (4 million kcal/h) that supplies half of the total fuel supply amount is supplied from the second fuel pipe 3, and the adjustment valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Further, combustion air is supplied from the supply and exhaust pipe 21, and exhaust gas of the combustion gas is supplied from the supply and exhaust pipe 22. At this time, on the paper surface, the flame extends from the upper portion toward the lower portion (the right side to the left side in FIG. 2) to have a substantially equal length, and the flame length F8 is the flame length F6 of FIG. 7A and the flame length of FIG. 7B. Compared with F7, it will be the shortest. Further, the length F8 of the flame at this time becomes longer than the length F3 of the flame of FIG. 5C.

As shown in FIG. 8A, the opening degree of the adjustment valve 11 is set to a fixed amount to supply fuel (for example, 2 million kcal/h) lower than the entire fuel supply amount from the main fuel pipe 1, and the valve 32 is adjusted. The opening degree is set to a fixed amount, and the remaining fuel (for example, 6 million kcal/h) is supplied from the second fuel pipe 3, and the regulating valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Further, combustion air is supplied from the supply and exhaust pipe 21, and exhaust gas of the combustion gas is supplied from the supply and exhaust pipe 22. At this time, on the paper surface, the flame is inclined toward the lower side of the furnace (to the left in FIG. 2) as compared with FIG. 7B, and the length F9 of the flame is substantially the same as the length F7 of the flame of FIG. 7B. Degree. Further, the length F9 of the flame at this time becomes longer than the length F4 of the flame of FIG. 6A.

As shown in FIG. 8B, the operation of alternately opening the adjustment valve 32 to fully open and supplying all the fuel (8 million kcal/h) from the second fuel pipe 3, and from the supply and exhaust pipe, is alternately repeated. The operation of supplying the combustion air (and discharging the combustion gas from the supply and exhaust pipe 22) and the opening of the adjustment valve 42 to the full opening, and supplying all the fuel (8 million kcal/h) from the third fuel pipe 4, The operation of supplying the combustion air from the supply and exhaust pipe 22 (and discharging the combustion gas from the supply and exhaust pipe 21). Further, the adjustment valve 11 is closed, and fuel supply from the main fuel pipe 1 is not performed. At this time, on the paper surface, the flame is inclined toward the lower or upper side of the furnace (left or right in FIG. 2) as compared with FIG. 8A, and the flame length F10 becomes the flame of FIG. 7A. The length of F6 is approximately the same. Further, the length F10 of the flame at this time becomes longer than the length F5 of the flame of FIG. 6B.

According to the regenerative burner device 10 having the above configuration, the following effects can be exhibited.

(1) Since the supply and exhaust pipes 21 and 22 are disposed around the main fuel pipe 1, and the second fuel pipe 3 and the third fuel pipe 4 are provided in the vicinity of the supply and exhaust pipes 21 and 22, When the fuel is supplied from the exhaust pipes 21 and 22, the main fuel pipe 1 can be used in combination. Further, since the main fuel pipe 1, the second fuel pipe 3, and the third fuel pipe 4 can adjust the fuel supply amount, and the supply and exhaust pipes 21 and 22 can adjust the combustion air supply amount, the main fuel pipe 1 is adjusted by adjustment. The fuel supply amount, the fuel supply amount from the second fuel pipe 3, the fuel supply amount from the third fuel pipe 4, and the combustion air supply amount from the supply and exhaust pipes 21 and 22 can adjust the length or inclination of the flame. .

(2) Since the combustion air is alternately supplied between the supply and exhaust pipe 21 and the supply and exhaust pipe 22, and the fuel is alternately supplied between the second fuel pipe 3 and the third fuel pipe 4, the fuel is alternately supplied. By adjusting the fuel supply amount from the main fuel pipe 1 and the fuel supply amount from the second fuel pipe 3 and the third fuel pipe 4, the amount of combustion can be maintained and the length or inclination of the flame can be adjusted.

(3) The fuel supply amount of the main fuel pipe 1 is set to be larger than the fuel supply amount of the second fuel pipe 3 or the third fuel pipe 4, and the second fuel pipe 3 or the third fuel pipe 4 is provided. The length of the flame can be lengthened compared to when the fuel supply amount is the same.

(4) The fuel supply amount of the main fuel pipe 1 is set to be smaller than the fuel supply amount of the second fuel pipe 3 or the third fuel pipe 4, and is set to be the second fuel pipe 3 or the third fuel pipe 4 The inclination of the flame can be made larger than when the fuel supply amount is higher than the above.

(5) The second fuel pipe 3 is configured to be open in the furnace S, and supplies fuel to the opening 21a of the furnace S toward the exhaust pipe 21, and the third fuel pipe 4 is configured to open in the furnace S, and Fuel is supplied to the opening 22a of the furnace S toward the exhaust pipe 22. Therefore, since the combustion air is mixed with the fuel and burned in the furnace S, and then mixed with the fuel of the main fuel pipe 1 and burned, the flame temperature can be made by dividing the time point of formation of the flame into two times. Lowering, the result is that the amount of NOx generated can be reduced.

(6) The opening portion 31 of the second fuel pipe 3 is located opposite to the opening portion 21a of the supply and exhaust pipe 21 on the opposite side of the opening of the main fuel pipe 1, and the opening portion 41 of the third fuel pipe 4 is opposed to The opening 22a of the supply and exhaust pipe 22 is located on the opposite side of the opening of the main fuel pipe 1. Therefore, by delaying the mixing of the fuel from the second fuel pipe 3 and the third fuel pipe 4 with the fuel from the main fuel pipe 1, the flame temperature can be lowered, and as a result, the amount of NOx generated can be reduced. Moreover, it is easy to ensure the arrangement angle of the second fuel pipe 3 and the third fuel pipe 4, and it is easy to design the inclination angles of the second fuel pipe 3 and the third fuel pipe 4 with respect to the furnace wall or the supply and exhaust pipes 21 and 22.

(7) The distance L1 between the second fuel pipe 3 and the supply and exhaust pipe 21 is smaller than the distance L2 between the exhaust pipe 21 and the main fuel pipe 1. It is preferable that the distance L1 is equal to or less than half of the distance L2. Therefore, the fuel from the second fuel pipe 3 and the combustion air from the supply and exhaust pipe 21 can be mixed first to form a flame, and then with the main fuel pipe 1. Fuel mixing. Therefore, by delaying the mixing of the fuel from the second fuel pipe 3 and the fuel from the main fuel pipe 1, the flame temperature can be lowered, and as a result, the amount of NOx generated can be reduced.

(8) The distance L3 between the third fuel pipe 4 and the supply and exhaust pipe 22 is smaller than the distance L4 between the exhaust pipe 22 and the main fuel pipe 1. It is preferable that the distance L3 is less than or equal to half the distance L4. Therefore, the fuel from the third fuel pipe 4 and the combustion air from the supply and exhaust pipe 22 can be mixed first to form a flame, and then with the fuel from the main fuel pipe 1. Fuel mixing. Therefore, by delaying the mixing of the fuel from the third fuel pipe 4 and the fuel from the main fuel pipe 1, the flame temperature can be lowered, and as a result, the amount of NOx generated can be reduced.

(9) The exhaust pipes 21 and 22 are arranged symmetrically on the concentric circles of the main fuel pipe 1, and the second fuel pipe 3 and the third fuel pipe 4 are arranged on the concentric circles of the main fuel pipe 1. symmetry. Therefore, it is easy to uniformly supply the combustion air from the supply and exhaust pipes 21 and 22 and the exhaust gas of the combustion exhaust gas to the main fuel pipe 1, and it is also easy to form the main fuel pipe 1 symmetrically as follows. The flame, that is, the flame formed by mixing the combustion air from the supply and exhaust pipe 21 with the fuel from the second fuel pipe 3, and the combustion air from the supply and exhaust pipe 22 and the third fuel The flame formed by the fuel of the tube 4 makes it possible to stabilize the combustion state around the main fuel pipe 1 in the furnace S.

(Other embodiment) FIG. 9 is a view showing another embodiment of the present invention. The second fuel pipe 3 is configured not to open in the furnace S but to open in the air supply and exhaust pipe 21 and to be in the air supply and exhaust pipe 21 Fuel is supplied, and the third fuel pipe 4 is configured not to open in the furnace S but to open in the supply and exhaust pipe 22, and to supply fuel into the supply and exhaust pipe 22. The other embodiment differs from the above-described embodiment in that the opening positions of the second fuel pipe 3 and the third fuel pipe 4 are different, and other configurations are the same as those of the above embodiment. Therefore, in the description of the other embodiments, the same portions as those in the above-described embodiments will be denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 9, the second fuel pipe 3 has an opening 34 in the supply and exhaust pipe 21. The opening portion 34 is located on the air supply upstream side of the air supply and exhaust pipe 21 more than the opening portion 21a. Moreover, the angle θ1 formed by the axial direction of the supply and exhaust pipe 21 and the axial direction of the second fuel pipe 3 is 45 degrees or less.

Similarly, the third fuel pipe 4 has an opening 44 in the supply and exhaust pipe 22 . The opening portion 44 is located on the air supply upstream side of the air supply and exhaust pipe 22 more than the opening portion 22a. Moreover, the angle θ2 formed by the axial direction of the supply and exhaust pipe 22 and the axial direction of the third fuel pipe 4 is 45 degrees or less.

Therefore, when the combustion air is supplied from the supply and exhaust pipe 21 to the furnace S and the combustion exhaust gas is discharged from the furnace S to the supply and exhaust pipe 22, first, the second fuel pipe 3 is mixed in the supply and exhaust pipe 21. The fuel and the combustion air from the exhaust pipe 21 form a flame, and then, in the furnace S, a flame is further formed by the flame in the exhaust pipe 21 and the fuel from the main fuel pipe 1.

When the combustion air is supplied from the air supply and exhaust pipe 22 to the furnace interior S and the combustion air is discharged from the furnace interior S to the air supply and exhaust pipe 21, first, the third fuel pipe 4 is mixed in the air supply and exhaust pipe 22. The fuel and the combustion air from the supply and exhaust pipe 22 form a flame, and then, in the furnace S, a flame is further formed by the flame in the supply and exhaust pipe 22 and the fuel from the main fuel pipe 1.

According to the above configuration, since the flame is formed in the supply and exhaust pipe 21 and in the supply and exhaust pipe 22, the flame state in the furnace S can be further stabilized.

Since the angle between the axial direction of the exhaust pipe 21 and the axial direction of the second fuel pipe 3 is 45 degrees or less, the fuel from the second fuel pipe 3 flows along the combustion air of the supply and exhaust pipe 21. The direction flows smoothly, and the mixing of the fuel from the second fuel pipe 3 and the combustion air from the supply and exhaust pipe 21 can be promoted.

Since the angle between the axial direction of the exhaust pipe 22 and the axial direction of the third fuel pipe 4 is 45 degrees or less, the fuel from the third fuel pipe 4 flows along the combustion air of the supply and exhaust pipe 22 . The direction flows smoothly, and the mixing of the fuel from the third fuel pipe 4 and the combustion air from the supply and exhaust pipe 22 can be promoted.

In the above embodiment and other embodiments, the main fuel pipe 1 is configured to supply only fuel, but the main fuel pipe 1 may be configured to supply fuel and combustion air. FIG. 10 is a schematic cross-sectional view of the regenerative burner device 10 in which the first air pipe 12 is provided, and the first air pipe 12 supplies combustion air to the main fuel pipe 1.

As shown in FIG. 10, the first air pipe 12 has an opening 12a in the main fuel pipe 1. The opening portion 12a is located on the upstream side of the fuel supply in the main fuel pipe 1 from the opening portion 1a of the main fuel pipe 1 toward the furnace interior S. The first air pipe 12 is provided with an adjustment valve 13 that switches the first air pipe 12 to adjust the amount of supply air for combustion. Moreover, the angle θ3 formed by the axial direction of the main fuel pipe 1 and the axial direction of the first air pipe 12 is 45 degrees or less.

Therefore, when the combustion air is supplied from the supply and exhaust pipe 21 to the furnace S and the combustion exhaust gas is discharged from the furnace S to the supply and exhaust pipe 22, first, the fuel from the second fuel pipe 3 is mixed in the furnace S. A flame is formed with the combustion air from the supply and exhaust pipe 21. Further, in the main fuel pipe 1, the fuel from the main fuel pipe 1 and the combustion air from the first air pipe 12 are mixed to form a flame. Further, in the furnace S, a flame is further formed by the flame from the second fuel pipe 3 and the supply and exhaust pipe 21 and the flame from the main fuel pipe 1.

Further, when the combustion air is supplied from the supply and exhaust pipe 22 to the furnace S and the combustion exhaust gas is discharged from the furnace S to the supply and exhaust pipe 21, first, the fuel from the third fuel pipe 4 is mixed in the furnace S. A flame is formed with the combustion air from the supply and exhaust pipe 22. Further, in the main fuel pipe 1, the fuel from the main fuel pipe 1 and the combustion air from the first air pipe 12 are mixed to form a flame. Further, in the furnace S, a flame is further formed by the flame from the third fuel pipe 4 and the supply and exhaust pipe 22 and the flame from the main fuel pipe 1.

According to the above configuration, since the flame is formed in the main fuel pipe 1, the flame state in the furnace S can be made more stable.

Since the angle formed by the axial direction of the main fuel pipe 1 and the axial direction of the first air pipe 12 is 45 degrees or less, the combustion air from the first air pipe 12 smoothly flows along the fuel flow direction of the main fuel pipe 1. The flow can promote the mixing of the fuel from the main fuel pipe 1 and the combustion air from the first air pipe 12.

In addition, in order to heat the combustion air in the first air pipe 12, a heating device such as an electric heater may be provided in the first air pipe 12.

In the above embodiment, the regenerative burner device 10 includes two supply and exhaust pipes 21 and 22, but the number of the supply and exhaust pipes may be three or more. Further, in consideration of the fact that the combustion air is alternately supplied between the supply and exhaust pipes and the combustion gas is discharged, the number of the supply and exhaust pipes is preferably an even number of two or more.

In the above embodiment, the supply and exhaust pipes 21 and 22 are arranged symmetrically on the concentric circles of the main fuel pipe 1, but may be arranged asymmetrically with respect to the main fuel pipe 1. Similarly, the second fuel pipe 3 and the third fuel pipe 4 are arranged symmetrically on the concentric circle of the main fuel pipe 1, but may be arranged asymmetrically with respect to the main fuel pipe 1.

Various changes and modifications can be made without departing from the spirit and scope of the inventions. Industrial availability

In the present invention, since it is possible to provide a regenerative burner device which can adjust the length or inclination of the flame, the industrial use value is large.

1‧‧‧Main fuel pipe

Openings 1a, 12a, 21a, 22a, 31, 34, 41, 44‧‧

3‧‧‧2nd fuel pipe (sub fuel pipe)

4‧‧‧3rd fuel pipe (sub fuel pipe)

10‧‧‧ Regenerative burner installation

11, 13, 32, 42, 511, 521‧‧ ‧ adjustment valve

12‧‧‧1st air tube

21, 22, 23, 24‧‧‧ exhaust pipes

51, 52‧‧‧ piping

61‧‧‧Air exhaust switching device

61a‧‧‧Switching valve

62‧‧‧Air supply pipe

63‧‧‧Exhaust exhaust pipe

211, 221‧‧ ‧ supply and exhaust room

212, 222‧‧ ‧ regenerator

213, 223‧‧‧Flange

F1~F10‧‧‧ Flame length

L1~L4‧‧‧Distance

S‧‧‧ furnace

Θ1～θ3‧‧‧ angle

Fig. 1 is a schematic cross-sectional view showing a regenerative burner device according to an embodiment of the present invention. Fig. 2 is a schematic view of a regenerative burner device as seen from the inside of the furnace. Fig. 3 is a view for explaining switching of an air-to-exhaust gas switching device. Fig. 4 is a view for explaining switching of an air-to-exhaust gas switching device. FIG. 5A is a schematic cross-sectional view showing a state in which the flame is supplied and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. FIG. 5B is a schematic cross-sectional view showing a state in which the flame is supplied and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. 5C is a schematic cross-sectional view showing a state in which the flame is supplied and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. FIG. 6A is a schematic cross-sectional view showing a state in which the flame is supplied and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. FIG. 6B is a schematic cross-sectional view showing a state in which the flame is supplied and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. FIG. 7A is a cross-sectional view showing a state in which the fuel supply amount is changed twice as shown in FIGS. 5A to 6B and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. Schematic diagram. FIG. 7B is a cross-sectional view showing a state in which the fuel supply amount is changed to twice as large as that of FIGS. 5A to 6B, and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. Schematic diagram. 7C is a cross-sectional view showing a state in which the entire fuel supply amount is set to twice as large as that of FIG. 5A to FIG. 6B, and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. Schematic diagram. FIG. 8A is a cross-sectional view showing a state in which the fuel supply amount is changed twice as shown in FIG. 5A to FIG. 6B and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. Schematic diagram. FIG. 8B is a cross-sectional view showing a state in which the fuel supply amount is changed twice as shown in FIGS. 5A to 6B and the fuel supply amount from the main fuel pipe, the second fuel pipe, and the third fuel pipe is changed. Schematic diagram. Fig. 9 is a schematic cross-sectional view showing a regenerative burner device according to another embodiment. Fig. 10 is a schematic cross-sectional view showing a regenerative burner device according to still another embodiment.

Claims (8)

A regenerative burner device is provided with a regenerator that recovers heat of combustion gas combusted in the furnace and heats combustion air. The regenerative burner device is characterized by: a fuel supply pipe; a plurality of supply and exhaust pipes disposed around the main fuel pipe, supplying combustion air and discharging combustion gas, and a fuel supply side in the vicinity of the supply and exhaust pipe In the fuel pipe, the main fuel pipe and the auxiliary fuel pipe may adjust a fuel supply amount, and the supply and exhaust pipe may adjust a combustion air supply amount. The regenerative burner device according to claim 1, wherein the first supply and exhaust pipe and the second supply and exhaust pipe are provided in the exhaust pipe, and the main fuel pipe is disposed in the opening in the furnace 1 between the opening of the exhaust pipe and the opening of the second supply and exhaust pipe in the furnace, and the first fuel pipe is provided in the vicinity of the opening of the first supply and exhaust pipe (2) an opening of the fuel pipe, and an opening of the third fuel pipe in the furnace is provided in the vicinity of the opening of the second supply and exhaust pipe, and the regenerative burner device is configured to be supplied to the first supply and exhaust pipe In the case of the combustion air, the main fuel pipe and the second fuel pipe are supplied with fuel, the second supply and exhaust pipe recovers waste heat, the third fuel pipe is not supplied with fuel, and the second supply pipe is configured to be combusted. When air is used, the main fuel pipe and the third fuel pipe supply fuel, the first supply and exhaust pipe recovers waste heat, and the second fuel pipe does not supply fuel. The regenerative burner device according to claim 2, wherein the total fuel supply amount of the main fuel pipe, the second fuel pipe, and the third fuel pipe is fixed, and the fuel of the main fuel pipe is supplied The amount is larger than the fuel supply amount of the second fuel pipe or the third fuel pipe, and the flame is lengthened as compared with when the fuel supply amount of the second fuel pipe or the third fuel pipe is the same. length. The regenerative burner device according to claim 2, wherein the total fuel supply amount of the main fuel pipe, the second fuel pipe, and the third fuel pipe is fixed, and the fuel of the main fuel pipe is supplied The amount is set to be smaller than the fuel supply amount of the second fuel pipe or the third fuel pipe, and the flame is increased in comparison with the fuel supply amount of the second fuel pipe or the third fuel pipe. The slope. The regenerative burner device according to any one of claims 2 to 4, wherein the second fuel pipe is configured to be open in the furnace and to supply fuel to the opening of the furnace toward the first supply and exhaust pipe. The third fuel pipe is configured to be opened in the furnace, and supplies fuel to the opening of the furnace toward the second supply and exhaust pipe. The regenerative burner device according to any one of claims 2 to 4, wherein the second fuel pipe is configured to be opened in the first supply and exhaust pipe, and to supply fuel into the first supply and exhaust pipe. The third fuel pipe is configured to be opened in the second supply and exhaust pipe and to supply fuel into the second supply and exhaust pipe. The regenerative burner device according to claim 5 or 6, wherein the opening of the second fuel pipe is located on the opposite side of the opening of the main fuel pipe with respect to the opening of the first fuel supply pipe; The opening of the third fuel pipe is located on the opposite side of the opening of the main fuel pipe with respect to the opening of the second supply and exhaust pipe. The regenerative burner device according to any one of claims 1 to 7, wherein the first air pipe is provided, and the first air pipe supplies combustion air to the main fuel pipe.