TWI751217B - Regenerative burner device - Google Patents

Abstract

A regenerative burner device provided with a regenerative body that recovers the heat of combustion gas burned in a furnace and heats combustion air, the regenerative burner device is characterized in that it is provided with: a main fuel pipe , supply fuel; and a plurality of supply and exhaust pipes, arranged around the main fuel pipe, supply combustion air and discharge combustion gas, and in the vicinity of the supply and exhaust pipes, are respectively provided with auxiliary fuel pipes for supplying fuel, The main fuel pipe and the auxiliary fuel pipe can adjust the fuel supply amount, and the supply and exhaust pipe can adjust the combustion air supply amount.

Description

Regenerative burner device Field of Invention

The present invention relates to the invention of a regenerative burner device.

Background of the Invention

Conventionally, for the purpose of saving energy in a combustion apparatus such as a heating furnace or a combustion furnace, a heat storage body is provided in the burner to recover the heat of the combustion gas burned in the furnace and heat the combustion air. Type burner devices are well known. In addition, as shown in Patent Documents 1 and 2, there is a combustion device in which a burner for supplying fuel and combustion air is arranged in the center of a furnace introduction portion, and the combustion air is supplied and exhausted around the burner. The main flame is formed by the supply and exhaust pipes of the combusted combustion gases.

prior art literature Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2007-024335

Patent Document 2: Japanese Patent Laid-Open No. 2010-127525

Summary of Invention

In these examples, a long flame is formed from the furnace introduction part by the jet flow of the combustion air from the supply and exhaust pipe, which makes it difficult to perform the desired heat treatment.

Then, in this invention, it aims at providing the regenerative burner apparatus which can adjust the length and inclination of a flame.

The present invention is a regenerative burner device provided with a regenerative body that recovers the heat of combustion gas burned in a furnace and heats combustion air, the regenerative burner device is characterized in that: : a main fuel pipe for supplying fuel; and a plurality of supply and exhaust pipes arranged around the main fuel pipe to supply combustion air and discharge combustion gas, and in the vicinity of the supply and exhaust pipes, each is provided with a supply pipe The fuel sub-fuel pipe, 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.

According to the above configuration, since the supply and exhaust pipes are arranged around the main fuel pipe and the sub fuel pipes are provided in the vicinity of the supply and exhaust pipes, the main fuel can also be used when the fuel is injected to the supply air from each of the supply and exhaust pipes. Tube. In addition, 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 sub-fuel pipe can be adjusted by adjusting the fuel supply amount. and The amount of combustion air supplied from the supply and exhaust pipes can adjust the length or inclination of the flame.

It is preferable that this invention further has the following structure.

(1) The supply and exhaust pipes are provided with a first supply and exhaust pipe and a second supply and exhaust pipe, and the opening of the main fuel pipe toward the inside of the furnace is arranged at the opening of the first supply and exhaust pipe toward the inside of the furnace. Between the opening and the opening of the second air supply and exhaust pipe toward the inside of the furnace, in the sub-fuel pipe, an opening of the second fuel pipe is provided near the opening of the first air supply and exhaust pipe, and in the vicinity of the opening of the first air supply and exhaust pipe. In the vicinity of the opening of the second supply and exhaust pipe, an opening of the third fuel pipe toward the inside of the furnace is provided, and the regenerative burner device is configured such that the main fuel pipe is configured such that when the first supply and exhaust pipe is supplied with combustion air, the main fuel 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 is configured such that when the second supply and exhaust pipe supplies combustion air, the main fuel pipe and the 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-mentioned configuration (1), the total amount of fuel supply 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 If the fuel supply amount is larger than that of the second fuel pipe or the third fuel pipe, the length of the flame will be longer than when the fuel supply amount is the same as that of the second fuel pipe or the third fuel pipe. .

(3) In the aforementioned configuration (1), the main fuel pipe and the second The sum of the fuel supply amounts of the fuel pipe and the third fuel pipe is fixed, and by setting the fuel supply amount of the main fuel pipe to be smaller than the fuel supply amount of the second fuel pipe or the third fuel pipe, Compared with the case where the fuel supply amount of the second fuel pipe or the third fuel pipe is set to be equal to or larger than the fuel supply amount of the second fuel pipe, the inclination of the flame is increased.

(4) In any one of the aforementioned configurations (1) to (3), the second fuel pipe is configured to open in the furnace and to supply fuel toward the first supply and exhaust pipe to the opening in the furnace, The said 3rd fuel pipe is comprised so that it may open in a furnace, and the said 2nd supply-and-exhaust pipe is comprised so that it may supply a fuel to the opening part in a furnace.

(5) In any one of the aforementioned configurations (1) to (3), the second fuel pipe is configured to open 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 open 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 to 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 for supplying combustion air into the main fuel pipe is provided.

According to the aforementioned configuration (1), since the combustion air is alternately supplied between the first air supply and exhaust pipe and the second air supply and exhaust pipe, and it is configured with this configuration. Combined, the fuel is supplied alternately between the second fuel pipe and the third fuel pipe, so 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 combustion amount can be maintained And adjust the length or tilt of the flame.

According to the above configuration (2), by setting the fuel supply amount of the main fuel pipe to be larger than the fuel supply amount of the second fuel pipe or the third fuel pipe, and setting the fuel supply amount with the second fuel pipe or the third fuel pipe The length of the flame can be made longer than when the fuel supply amount is the same.

According to the above configuration (3), by setting the fuel supply amount of the main fuel pipe to be smaller than the fuel supply amount of the second fuel pipe or the third fuel pipe, and setting the fuel supply amount in the second fuel pipe or the third fuel pipe The inclination of the flame can be made larger than when the fuel supply amount is more than that.

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

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

According to the aforementioned configuration (6), by delaying the mixing timing of fuel and combustion air from the main fuel pipe relative to the mixing timing of fuel and air from the second fuel pipe and the third fuel pipe, the flame temperature can be increased. As a result, the NOx generation amount can be reduced. In addition, it is easy to secure the arrangement area of the second fuel pipe and the third fuel pipe, and it becomes easy to design the second fuel pipe and the inclination angle of the third fuel pipe to the furnace wall or the supply and exhaust pipe.

According to the aforementioned configuration (7), since the flame is formed in the main fuel pipe, the state of the flame in the furnace can be further stabilized.

In conclusion, according to the present invention, it is possible to provide a regenerative burner device in which the length or inclination of the flame can be adjusted.

1: Main fuel pipe

1a, 12a, 21a, 22a, 31, 34, 41, 44: Opening

3: The second fuel pipe (sub-fuel pipe)

4: 3rd fuel pipe (auxiliary fuel pipe)

10: Regenerative burner device

11, 13, 32, 42, 511, 521: Adjustment valve

12: 1st air pipe

21, 22, 23, 24: Supply and 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 chamber

212, 222: heat accumulator

213, 223: Flange

F1~F10: Flame length

L1~L4: Distance

S: inside the furnace

θ1~θ3: Angle

FIG. 1 is a schematic plan cross-sectional view of a regenerative burner device according to an embodiment of the present invention.

Fig. 2 is a schematic view of the regenerative burner device viewed from the inside of the furnace.

FIG. 3 is a diagram illustrating the switching of the air/exhaust switching device.

FIG. 4 is a diagram illustrating the switching of the air/exhaust switching device.

5A is a schematic cross-sectional view showing a state of flame formation when the entire fuel supply amount is fixed and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed.

5B is a schematic cross-sectional view showing the state of flame formation when the entire fuel supply amount is fixed and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed.

5C is a schematic cross-sectional view showing a state of flame formation when the entire fuel supply amount is fixed and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed.

6A is a schematic cross-sectional view showing the state of flame formation when the entire fuel supply amount is fixed and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed.

6B is a schematic cross-sectional view showing a state of flame formation when the entire fuel supply amount is fixed and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed.

7A is a cross section showing the state of flame formation when the entire fuel supply amount is doubled as in FIGS. 5A to 6B and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed Sketch map.

7B is a cross section showing the state of flame formation when the entire fuel supply amount is doubled as shown in FIGS. 5A to 6B and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed Sketch map.

7C is a cross-section showing the state of flame formation when the entire fuel supply amount is doubled as shown in FIGS. 5A to 6B and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed Sketch map.

8A is a cross section showing the state of flame formation when the entire fuel supply amount is doubled as shown in FIGS. 5A to 6B and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed Sketch map.

8B is a cross-section showing the state of flame formation when the entire fuel supply amount is doubled as shown in FIGS. 5A to 6B and the fuel supply amounts from the main fuel pipe, the second fuel pipe, and the third fuel pipe are changed Sketch map.

9 is a schematic cross-sectional view of a regenerative burner device according to another embodiment.

Fig. 10 is a schematic cross-sectional view of a regenerative burner device according to another embodiment.

Form for carrying out the invention

(overall composition)

FIG. 1 is a schematic plan cross-sectional 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 for supplying fuel, and two or more supply and exhaust pipes 21 and 22 arranged around the main fuel pipe 1 for supplying combustion air and arranged in parallel Release combustion gases.

The main fuel pipe 1 is configured to supply fuel into the furnace S, and one end communicates with the furnace S. The supply and exhaust pipes 21 and 22 are configured to supply combustion air to the inside of the furnace S, and have one end communicated with the inside of the furnace S. The main fuel pipe 1 is provided with a regulating valve 11 that opens and closes the main fuel pipe 1 to adjust the fuel supply amount. The supply and exhaust pipes 21 and 22 are inclined toward the inside of the furnace S so as to be close to the main fuel pipe 1 . Preferably, the supply and exhaust pipes 21 and 22 are inclined at about 10 degrees in advance.

Furthermore, a second fuel pipe 3 and a third fuel pipe 4 for supplying fuel into 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 31 toward the inside of the furnace S in the vicinity of the opening 21a of the supply and exhaust pipe 21 toward the inside of the furnace S. The second fuel pipe 3 is configured to supply fuel toward the opening 21 a of the supply and 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 a regulating valve 32 that opens and closes 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 41 toward the inside of the furnace S in the vicinity of the opening 22a of the supply and exhaust pipe 22 toward the inside of the furnace S. The third fuel pipe 4 is configured to supply fuel toward the opening 22 a of the supply and 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 . A regulating valve 42 is provided in the third fuel pipe 4, and the regulating valve 42 opens and closes the third fuel pipe 4. The fuel pipe 4 is used to adjust the fuel supply amount.

The other end of the supply and exhaust pipe 21 is communicated with the supply and exhaust chamber 211 . A thermal storage body 212 is arranged in the air supply and exhaust chamber 211 . Similarly, the other end of the supply and exhaust pipe 22 communicates with the supply and exhaust chamber 221 . A thermal storage body 222 is arranged in the air supply and exhaust chamber 221 .

FIG. 2 is a schematic diagram of the regenerative burner device 10 viewed from the S side in the furnace. As shown in FIG. 2 , the main fuel pipe 1 is arranged in the center, the supply and exhaust pipe 21 is arranged to the right of the main fuel pipe 1 , and the supply and exhaust pipe 22 is arranged to the left of the main fuel pipe 1 . The second fuel pipe 3 is arranged to the right of the supply and exhaust pipe 21 , and the third fuel pipe 4 is arranged to the left of the supply and exhaust pipe 22 . In addition, 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 row from the right to the left.

The distance L1 between the second fuel pipe 3 and the supply and exhaust pipe 21 is smaller than the distance L2 between the supply and exhaust pipe 21 and the main fuel pipe 1 . Preferably, the distance L1 is not more 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 supply and exhaust pipe 22 and the main fuel pipe 1 . Preferably, the distance L3 is not more 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 air supply and exhaust chamber 211 is connected to the air and exhaust gas switching device 61 via the piping 51 , and the air supply and exhaust chamber 221 is similarly connected to the air and exhaust gas switching device 61 via the piping 52 . The supply and exhaust chamber 211 and the piping 51 are connected through the flange 213 , and the supply and exhaust chamber 221 and the piping 52 are connected through the flange 223 . The piping 51 is provided with a regulating valve 511 that opens and closes the piping 51 to adjust the supply amount of combustion air, and the piping 52 is provided with a regulating valve 511 . The valve 521 opens and closes the piping 52 to adjust the supply amount of combustion air. The air 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 allows the air supply pipe 62 to communicate with the pipe 51 or the pipe 52, and simultaneously connects the exhaust gas discharge pipe 63 to the pipe 51. The piping 52 or the piping 51 communicates with each other. The air supply pipe 62 is provided with an air supply blower (not shown) for supplying combustion air, and the exhaust gas discharge pipe 63 is provided with an exhaust fan (not shown) for discharging combustion exhaust gas.

3 and 4 are diagrams for explaining switching of the air and exhaust gas switching device 61 . In FIG. 3 , the switching valve 61 a of the air-exhaust switching device 61 communicates the air supply pipe 62 and the piping 51 , and communicates the exhaust gas discharge pipe 63 and the piping 52 . As a result, the combustion air from the air supply pipe 62 passes through the pipe 51 and is heated by the heat accumulator 212 in the supply and exhaust chamber 211 , which has been thermally stored, and is injected into the furnace S from the supply and exhaust pipe 21 . In addition, 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 waste heat is recovered and stored by the heat storage body 222 in 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 61 a of the air-to-exhaust switching device 61 communicates the air supply pipe 62 and the piping 52 , and communicates the exhaust gas discharge pipe 63 and the piping 51 . As a result, the combustion air from the air supply pipe 62 passes through the pipe 52 and is heated by the heat accumulating body 222 of the supply and exhaust chamber 221 , and is sprayed into the furnace S from the supply and exhaust pipe 22 . In addition, 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 waste heat is recovered and stored by the heat accumulator 212 of the supply and exhaust chamber 211, and through the piping 51 to remove the exhaust gas from the The discharge pipe 63 discharges.

As described above, by switching the switching valve 61a of the air-exhaust 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 recovers the heat of the combustion exhaust gas burned in the furnace S by the regenerators 212 and 222, and the combustion air is heated by the heat recovered by the regenerators 212 and 222.

In the present invention, 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, 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 , and a flame is further formed by this flame and the fuel from the main fuel pipe 1 . In addition, when the combustion air is supplied from the supply and exhaust pipe 22 to the furnace S and the combustion exhaust gas is recovered from the furnace S to the 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 this flame and the fuel from the main fuel pipe 1 .

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

FIGS. 5A to 5C and FIGS. 6A and 6B show that the overall fuel supply amount 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 second fuel pipe 3 are 3. A schematic cross-sectional view of the formation state of the flame 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. In addition, here, the amount of combustion air is set to be an amount for supplying coordinated combustion. Also, FIGS. 5A to 6B all show The state in which combustion air is supplied from the supply and exhaust pipe 21 and the combustion gas is discharged from the supply and exhaust pipe 22 is shown, and the flame state when the supply of combustion air and the exhaust of combustion gas are switched is shown by a broken line.

As shown in FIG. 5A , the opening degree of the regulating valve 11 is fully opened, all the fuel (4 million kcal/h) is supplied from the main fuel pipe 1, the regulating valves 32 and 42 are closed, and the second fuel pipe 3 and the The fuel supply amount of the third fuel pipe 4 is zero. Then, the supply of combustion air from the supply and exhaust pipe 21, the exhaust of combustion gas from the supply and exhaust pipe 22, the supply of combustion air from the supply and exhaust pipe 22, and the supply of the combustion air from the supply and exhaust pipe are alternately repeated. 21 of the combustion gas exhaust. At this time, the flame extends substantially straight into the furnace, and the length F1 of the flame becomes the longest as compared with FIGS. 5B and 5C described later.

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

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

As shown in FIG. 6A , the opening degree of the regulating valve 11 is set to be opened by a fixed amount, the fuel less than half of the total fuel supply amount (for example, 1 million kcal/h) is supplied from the main fuel pipe 1, and the opening of the regulating valve 32 is set to The opening degree is set to open a fixed amount to supply the remaining fuel (eg, 3 million kcal/h) from the second fuel pipe 3, and close the regulating valve 42 to make the fuel supply amount from the third fuel pipe 4 zero. Then, combustion air is supplied from the supply and exhaust pipe 21 , and combustion gas is exhausted from the supply and exhaust pipe 22 . At this time, on the paper, the flame is inclined downward (leftward in FIG. 2 ) in the furnace compared with FIG. 5B , and the length F4 of the flame is substantially the same as the length F2 of the flame in FIG. 5B . Degree.

As shown in 6B, the following operations are alternately repeated in which the opening degree of the regulating valve 32 is fully opened, all the fuel (4 million kcal/h) is supplied from the second fuel pipe 3, and the supply and exhaust pipe 21 The operation of supplying combustion air (and discharging combustion gas from the supply and exhaust pipe 22 ), and fully opening the opening degree of the regulating valve 42 to supply all the fuel (4 million kcal/h) from the third fuel pipe 4, and The operation of supplying combustion air from the supply and exhaust pipe 22 (and discharging combustion gas from the supply and exhaust pipe 21 ). In addition, the regulating valve 11 is closed, and the fuel supply from the main fuel pipe 1 is not performed. At this point, on paper, the flames and Compared with FIG. 6A , the shape is inclined downward or upward (left or right in FIG. 2 ) in the furnace, and the length F5 of the flame is approximately the same as the length F1 of the flame in FIG. 5A .

FIGS. 7A to 7C and FIGS. 8A and 8B show that the entire fuel supply amount supplied to the furnace S is the same, and the fuel supply amount is set to be twice the fuel supply amount of FIGS. 5A to 5C and FIGS. 6A and 6B ( 8,000,000 kcal/h), and a schematic cross-sectional view of a flame formation state when the fuel supply amounts from the main fuel pipe 1, the second fuel pipe 3, and the third fuel pipe 4 are changed. In addition, in these figures, the supply and exhaust chambers 211 and 221 are omitted. In addition, here, the amount of combustion air is set to be an amount for supplying coordinated combustion. 7A to 8B all show the state in which combustion air is supplied from the supply and exhaust pipe 21 and combustion gas is discharged from the supply and exhaust pipe 22, and the flame when the supply of combustion air and the exhaust of combustion gas are switched Status is shown with dashed lines.

As shown in FIG. 7A , the opening degree of the regulating valve 11 is fully opened, and all the fuel (8 million kcal/h) is supplied from the main fuel pipe 1, and the regulating valves 32 and 42 are closed, and the second fuel pipes 3 and 42 are closed. The fuel supply amount of the third fuel pipe 4 is zero. Then, the supply of combustion air from the supply and exhaust pipe 21, the exhaust of combustion gas from the supply and exhaust pipe 22, the supply of combustion air from the supply and exhaust pipe 22, and the supply of the combustion air from the supply and exhaust pipe are alternately repeated. 21 of the combustion gas exhaust. At this time, the flame extends substantially straight into the furnace, and the length of the flame becomes the longest as compared with FIGS. 7B and 7C described later. In addition, 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 regulating valve 11 is set to be opened by a fixed amount, and a fuel exceeding half of the entire fuel supply amount is supplied from the main fuel pipe 1 fuel (for example, 6 million kcal/h), the opening degree of the regulating valve 32 is set to open a fixed amount, the remaining fuel (for example, 2 million kcal/h) is supplied from the second fuel pipe 3, and the regulating valve is closed 42 to make the fuel supply amount from the third fuel pipe 4 zero. Then, combustion air is supplied from the supply and exhaust pipe 21 , and combustion gas is exhausted from the supply and exhaust pipe 22 . At this time, on the paper, the flame extends from the upper part toward the lower part (from the right to the left in FIG. 2 ) and becomes longer, and the length of the flame becomes shorter than that in FIG. 7A . In addition, 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 regulating valve 11 is set to a fixed amount, and half of the fuel (4 million kcal/h) of the entire fuel supply amount is supplied from the main fuel pipe 1, and the opening degree of the regulating valve 32 is set to A fixed amount of fuel is supplied from the second fuel pipe 3 (4 million kcal/h) of the entire fuel supply amount, and the regulating valve 42 is closed to make the fuel supply amount from the third fuel pipe 4 zero. Then, combustion air is supplied from the supply and exhaust pipe 21 , and combustion gas is exhausted from the supply and exhaust pipe 22 . At this time, on the paper, the flame extends from the upper part to the lower part (from the right to the left in FIG. 2 ) to have a substantially equal length, and the flame length F8 is the same as the flame length F6 in FIG. 7A and the flame length in FIG. 7B . Compared to F7, it will become the shortest. In addition, 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 regulating valve 11 is set to be opened by a fixed amount, and the fuel (for example, 2 million kcal/h) is supplied from the main fuel pipe 1 less than half of the total fuel supply amount (for example, 2 million kcal/h), and the opening of the regulating valve 32 is set. The opening degree is set to open a fixed amount to supply the remaining fuel (for example, 6 million kcal/h) from the second fuel pipe 3, and close the regulating valve 42 to supply the fuel from the third fuel pipe 4. The amount is zero. Then, combustion air is supplied from the supply and exhaust pipe 21 , and combustion gas is exhausted from the supply and exhaust pipe 22 . At this time, on the paper, the flame is inclined downward (leftward in FIG. 2 ) in the furnace compared with FIG. 7B , and the length F9 of the flame is substantially the same as the length F7 of the flame in FIG. 7B . Degree. In addition, 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 following operations are alternately repeated, that is, the opening degree of the regulating valve 32 is fully opened, all the fuel (8 million kcal/h) is supplied from the second fuel pipe 3, and the entire amount of fuel (8 million kcal/h) is supplied from the supply and exhaust pipe 3. 21 supplying combustion air (and discharging combustion gas from the supply and exhaust pipe 22), and fully opening the opening degree of the regulating valve 42 to supply all the fuel (8 million kcal/h) from the third fuel pipe 4, And the operation of supplying combustion air from the supply and exhaust pipe 22 (and discharging combustion gas from the supply and exhaust pipe 21 ). In addition, the regulating valve 11 is closed, and the fuel supply from the main fuel pipe 1 is not performed. At this time, on the paper, the flame is inclined downward or upward (left or right in FIG. 2 ) in the furnace compared with FIG. 8A , and the length F10 of the flame is the same as the flame in FIG. 7A . The length of F6 is about the same degree. In addition, the length F10 of the flame at this time becomes longer than the length F5 of the flame of FIG. 6B .

The following effects can be exhibited by the regenerative burner device 10 configured as described above.

(1) Since the supply and exhaust pipes 21 and 22 are arranged 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, the The main fuel pipe 1 may also be used when fuel is injected from the air supply from the exhaust pipes 21 and 22 . Moreover, due to the main fuel pipe 1, the first 2. The 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. Therefore, by adjusting the fuel supply amount from the main fuel pipe 1, from the second fuel The fuel supply amount of the 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 and inclination of the flame.

(2) Since combustion air is alternately supplied between the supply and exhaust pipes 21 and 22 , and in conjunction with this, fuel is alternately supplied between the second fuel pipe 3 and the third fuel pipe 4 . 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 length or inclination of the flame can be adjusted while maintaining the combustion amount.

(3) By setting the fuel supply amount of the main fuel pipe 1 to be larger than the fuel supply amount of the second fuel pipe 3 or the third fuel pipe 4, and setting the fuel supply amount to the second fuel pipe 3 or the third fuel pipe 4 Compared with the same amount of fuel supply, the length of the flame can be made longer.

(4) By setting the fuel supply amount of the main fuel pipe 1 to be smaller than the fuel supply amount of the second fuel pipe 3 or the third fuel pipe 4, and setting it in 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 more than 100%.

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

(6) The opening 31 of the second fuel pipe 3 is located on the opposite side of the opening 21 a of the supply and exhaust pipe 21 from the opening of the main fuel pipe 1 , and the opening 41 of the third fuel pipe 4 is opposite to the opening 21 a of the supply and exhaust pipe 21 . The opening portion 22 a of the supply and exhaust pipe 22 is located on the opposite side to the opening portion 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 and the fuel from the main fuel pipe 1, the flame temperature can be lowered, and as a result, the NOx generation amount can be reduced. Moreover, it is easy to secure the arrangement area of the second fuel pipe 3 and the third fuel pipe 4, and it becomes easy to design the inclination angle 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 supply and exhaust pipe 21 and the main fuel pipe 1 . Preferably, the distance L1 is less than or equal to half of the distance L2, so 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 mixed with the fuel from the main fuel pipe 1. fuel mix. 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 NOx generation amount 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 supply and exhaust pipe 22 and the main fuel pipe 1 . Preferably, the distance L3 is less than or equal to half of 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 mixed with the fuel from the main fuel pipe 1. fuel mix. 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 NOx generation amount can be reduced.

(9) The supply and exhaust pipes 21 and 22 are arranged symmetrically on the concentric circle of the main fuel pipe 1 , and the second fuel pipe 3 and the third fuel pipe 4 are arranged on the concentric circle of the main fuel pipe 1 so as to meet each other. symmetry. Therefore, it becomes easy to uniformly supply combustion air from the supply and exhaust pipes 21 and 22 and exhaust combustion exhaust gas to the main fuel pipe 1, and it becomes easy to form the following symmetrically about the main fuel pipe 1. The flame, that is, the flame formed by mixing the combustion air from the supply and exhaust pipe 21 and the fuel from the second fuel pipe 3, and the flame formed by mixing the combustion air from the supply and exhaust pipe 22 and the third fuel Because of the flame formed by the fuel in the pipe 4, in the furnace S, the combustion state around the main fuel pipe 1 can be more stabilized.

(Other Embodiments)

9 shows 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 supply and exhaust pipe 21, and to supply fuel into the supply and exhaust pipe 21, the third The fuel pipe 4 is not opened in the furnace S but is opened in the supply and exhaust pipe 22 , and is configured to supply fuel into the supply and exhaust pipe 22 . The other embodiment is different 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 the above-described embodiment. Therefore, in description of other embodiment, the same code|symbol is attached|subjected to the part which is the same as the above-mentioned embodiment, and the detailed description of the content is abbreviate|omitted.

As shown in FIG. 9 , the second fuel pipe 3 has an opening 34 in the supply and exhaust pipe 21 . The opening 34 is located on the upstream side of the air supply than the opening 21a in the air supply and exhaust pipe 21 . 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 44 is located on the upstream side of the air supply than the opening 22a in the air supply and exhaust pipe 22 . 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 inside of the furnace S and the combustion exhaust gas is discharged from the inside of the furnace S to the supply and exhaust pipe 22, first, in the supply and exhaust pipe 21, the fuel from the second fuel pipe 3 is mixed. The fuel and the combustion air from the supply and exhaust pipe 21 form a flame, and then, in the furnace S, a flame is further formed by the flame in the supply and exhaust pipe 21 and the fuel from the main fuel pipe 1 .

Furthermore, 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, in the supply and exhaust pipe 22, the fuel from the third fuel pipe 4 is mixed. 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 the supply and exhaust pipe 22, the flame state in the furnace S can be further stabilized.

Since the angle formed between 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, the fuel from the second fuel pipe 3 follows the flow of the combustion air in the supply and exhaust pipe 21 The smooth flow can promote the mixing of the fuel from the second fuel pipe 3 and the combustion air from the supply and exhaust pipe 21 .

Since the angle formed between 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, the fuel from the third fuel pipe 4 follows the flow of the combustion air in the supply and exhaust pipe 22 The smooth flow can promote the mixing of the fuel from the third fuel pipe 4 and the combustion air from the supply and exhaust pipe 22 .

In the above-described 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. 10 is a schematic cross-sectional view of the regenerative burner device 10 provided with the first air pipe 12 for supplying combustion air to the main fuel pipe 1 .

As shown in FIG. 10 , the first air pipe 12 has an opening 12 a in the main fuel pipe 1 . In the main fuel pipe 1, the opening portion 12a is located on the upstream side of the fuel supply from the opening portion 1a of the main fuel pipe 1 facing the inside of the furnace S. The first air pipe 12 is provided with a regulating valve 13 that opens and closes the first air pipe 12 to adjust the supply amount of combustion air. In addition, 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 inside of the furnace S and the combustion exhaust gas is discharged from the inside of the furnace S to the supply and exhaust pipe 22, in the inside of the furnace S, first, the fuel from the second fuel pipe 3 is mixed A flame is formed with the combustion air from the supply and exhaust pipe 21 . Moreover, 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. In addition, 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 .

In addition, 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, in the furnace S, first, the fuel from the third fuel pipe 4 is mixed A flame is formed with the combustion air from the supply and exhaust pipe 22 . Moreover, 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. In addition, 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 state of the flame in the furnace S can be further stabilized.

Since the angle formed between 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 flows smoothly 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 1st air duct 12, a heating device, such as an electric heater, may be provided in the 1st air duct 12.

In the above-described embodiment, the regenerative burner device 10 is provided with the two supply and exhaust pipes 21 and 22, but the number of the supply and exhaust pipes may be three or more. In addition, in consideration of alternately supplying combustion air between the supply and exhaust pipes and discharging combustion gas, the number of the supply and exhaust pipes is preferably an even number of 2 or more.

In the above-described embodiment, the supply and exhaust pipes 21 and 22 are arranged symmetrically on the concentric circle of the main fuel pipe 1 , but they 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 Although it may be arranged symmetrically on the concentric circle of the main fuel pipe 1 , it may be arranged asymmetrically with respect to the main fuel pipe 1 .

Various modifications and changes can be made without departing from the spirit and scope of the present invention described in the claims.

industrial availability

In the present invention, since it is possible to provide a regenerative burner device that can adjust the length and inclination of the flame, it is of great industrial utility.

1‧‧‧Main fuel pipe

21a, 22a, 31, 41‧‧‧Opening

3‧‧‧Second fuel pipe (sub-fuel pipe)

4‧‧‧The 3rd fuel pipe (sub-fuel pipe)

10‧‧‧Regenerative burner device

11, 32, 42, 511, 521‧‧‧regulating valve

21, 22‧‧‧Supply and exhaust pipes

51, 52‧‧‧Piping

61‧‧‧Air exhaust gas switching device

61a‧‧‧Switching valve

62‧‧‧Air supply pipe

63‧‧‧Exhaust pipe

211, 221‧‧‧supply and exhaust chamber

212, 222‧‧‧Regenerator

213, 223‧‧‧Flange

S‧‧‧In the furnace

Claims (7)

A regenerative burner device is provided with a regenerative body that recovers the heat of combustion gas burned in a furnace and heats combustion air, the regenerative burner device is characterized in that: the regenerative burner device is provided with: a main fuel a pipe for supplying fuel; and a plurality of supply and exhaust pipes, which are arranged around the main fuel pipe, supply combustion air and discharge combustion gas, and in the vicinity of the supply and exhaust pipes, respectively are provided with auxiliary fuel supply pipes The fuel pipe, the main fuel pipe and the auxiliary fuel pipe can adjust the fuel supply amount, the supply and exhaust pipe can adjust the supply amount of combustion air, and the supply and exhaust pipe is provided with a first supply and exhaust pipe and a second exhaust pipe. A supply and exhaust pipe, wherein the opening of the main fuel pipe into the furnace is arranged between the opening of the first supply and exhaust pipe into the furnace and the opening of the second supply and exhaust pipe into the furnace, and between the opening of the second supply and exhaust pipe. Regarding the fuel pipe, the opening of the second fuel pipe is provided near the opening of the first supply and exhaust pipe, and the opening of the third fuel pipe into the furnace is provided near the opening of the second supply and exhaust pipe. The regenerative burner device is configured such that when combustion air is supplied to the first supply and exhaust pipe, the main fuel pipe and the second fuel pipe supply fuel, the second supply and exhaust pipe recovers waste heat, and the third The fuel line does not supply fuel, When the combustion air is supplied to the second supply and exhaust pipe, the main fuel pipe and the third fuel pipe supply fuel, the first supply and exhaust pipe recovers waste heat, the second fuel pipe does not supply fuel, and the second fuel pipe does not supply fuel. The main fuel pipe and the auxiliary fuel pipe share the supply and exhaust pipe, and the distance between the opening of the auxiliary fuel pipe toward the inside of the furnace and the opening of the supply and exhaust pipe toward the inside of the furnace is greater than the distance between the opening of the supply and exhaust pipe toward the inside of the furnace. The distance between the opening in the furnace and the opening of the main fuel pipe in the furnace is small. The regenerative burner device according to claim 1, wherein the sum of the fuel supply amounts of the main fuel pipe, the second fuel pipe, and the third fuel pipe is fixed, and the fuel supply from the main fuel pipe is If the amount is set to be larger than the fuel supply amount of the second fuel pipe or the third fuel pipe, the flame length will be longer than when the fuel supply amount is set to be the same as the fuel supply amount of the second fuel pipe or the third fuel pipe. length. The regenerative burner device according to claim 1, wherein the sum of the fuel supply amounts of the main fuel pipe, the second fuel pipe, and the third fuel pipe is fixed, and the fuel supply from the main fuel pipe is 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 larger than the fuel supply amount of the second fuel pipe or the third fuel pipe. tilt. The regenerative burner device according to claim 1, wherein the second fuel pipe is configured to open in the furnace, and the fuel is supplied to the opening in the furnace toward the first supply and exhaust pipe, The said 3rd fuel pipe is comprised so that it may open in a furnace, and the said 2nd supply-exhaust pipe is comprised so that it may supply fuel to the opening part in a furnace. The regenerative burner device according to claim 1, wherein the second fuel pipe is configured to open in the first supply and exhaust pipe and to supply fuel into the first supply and exhaust pipe, and the third fuel pipe is configured to In order to open in the said 2nd supply-exhaust pipe, the fuel is supplied into the said 2nd supply-exhaust pipe. The regenerative burner device according to claim 4, wherein the opening of the second fuel pipe is located on the opposite side to the opening of the main fuel pipe with respect to the opening of the first supply and exhaust pipe, and the first 3. The opening of the fuel pipe is located on the opposite side to the opening of the main fuel pipe with respect to the opening of the second air supply and exhaust pipe. The regenerative burner device according to any one of claims 1 to 6, further comprising a first air pipe that supplies combustion air into the main fuel pipe.

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