TW201907124A - Regenerative combustion equipment - Google Patents

Abstract

In a regenerative combustion equipment provided with a regenerative burner 20, the combustion air that is heated and guided by the regenerative unit 22 is supplied to the inside of a furnace 10 from an air supply and exhaust port 23b while whirling along the inner circumference of a cylindrical combustion air supply path 23. Further, the fuel is supplied from a first fuel supply nozzle 31 to the inside of the furnace via a first fuel supply port 31a provided in a furnace wall 11 near the air supply and exhaust port, such that the whirling combustion air is mixed with the fuel, and the fuel is burned in the furnace.

Description

 Regenerative combustion equipment  

The present invention relates to a regenerative combustion apparatus provided with a regenerative burner, which is heated by a heat storage material housed in a heat storage unit and guided to a furnace via a combustion air supply path. The combustion air is mixed with the fuel supplied from the fuel supply nozzle, and the fuel is burned in the furnace. In particular, it has a feature that the combustion air that is heated by the heat storage material stored in the heat storage unit and guided into the furnace through the combustion air supply path is mixed with the fuel supplied from the fuel supply nozzle, and When the fuel is burned in the furnace, the length of the flame at the time of combustion can be easily shortened or the amount of NOx generated during combustion can be reduced.

In the heating furnace or the like, in order to perform combustion with high efficiency by utilizing the heat of the combustion exhaust gas, as disclosed in Patent Document 1, a regenerative combustion apparatus including a regenerative burner is used, and the regenerative burner is The heat of the combustion exhaust gas in the furnace is stored in the heat storage material stored in the heat storage unit, and the combustion air is guided to the heat storage unit, and the combustion air is heated by the heat storage material stored in the heat storage unit. The heated combustion air thus heated is mixed with the fuel supplied from the fuel supply nozzle, and the fuel is burned in the furnace.

However, there are the following problems: in the case of the above-described regenerative burner, since the heated combustion air is mixed with the fuel and burned, the temperature of the flame at the time of combustion becomes high and the amount of NOx is increased, or In the case of the conventional regenerative burner, in general, the expansion of the flame is small and the flame becomes long, so that the flame contacts the object to be treated in the furnace, and damage is caused to the object to be treated, and further, in order to prevent the flame from being In contact with the object to be treated, it is necessary to increase the furnace, and there are various problems such as an increase in equipment cost or operating cost.

In order to shorten the flame at the time of combustion in the regenerative burner as described above, as disclosed in Patent Document 2, it has been proposed to provide a porous substance having a gas permeability at the end of the fuel supply nozzle, in the fuel supply nozzle. The front end portion constitutes a flame hole portion and constitutes a fuel ejecting portion, and the combustion air heated by the heat storage material in the heat accumulating portion is in the flame hole portion in which the porous material is provided as described above, and the fuel ejected from the fuel ejecting portion Mixing to burn it reduces the length of the flame when burning.

However, as shown in Patent Document 2, in the flame hole portion in which the porous material is provided, the fuel ejected from the fuel ejecting portion is mixed with the heated combustion air to be combusted, and the combustion air is provided through the aforementioned The flame hole portion of the porous material is sent out, and it is necessary to have a large blower or the like, and there is a problem of increasing equipment cost or operating cost.

In addition, as shown in the patent document 3, it is proposed that a cylindrical portion having a cylindrical shape is provided in a portion of the furnace for supplying combustion air heated by the heat storage material in the heat storage portion, and the circle is formed in the circle. The heated combustion air is swirled in the tubular portion, and the fuel gas is supplied from the gas nozzle to the cylindrical portion, and the combustion air and the fuel gas heated and swirled as described above are mixed and burned, and are passed through The enlarged diameter portion of the furnace wall is guided into the furnace, and the diameter of the burning flame is gradually increased to shorten the flame length during combustion and reduce the amount of NOx generated.

However, as shown in Patent Document 3, the heated combustion air is swirled in the cylindrical portion that supplies the combustion air in the furnace, and the fuel gas is supplied from the gas nozzle to the cylindrical portion, thereby being The swirling heated combustion air and the fuel gas are mixed and burned, and the flame diameter which is burned by the enlarged diameter portion of the furnace wall is gradually increased, and the temperature of the flame at the time of combustion is still high. The amount of NOx generated cannot be sufficiently reduced, and when the amount of combustion increases, the amount of supply of combustion air or fuel gas increases, the amount of NOx generated increases, and the flame cannot be made along the enlarged diameter portion of the furnace wall. The diameter is sufficiently enlarged, and it is difficult to shorten the flame length at the time of combustion.

 [Previous Technical Literature]    [Patent Literature]  

Patent Document 1: Japanese Patent Laid-Open No. Hei 9-222223

Patent Document 2: Japanese Laid-Open Patent Publication No. 2000-199611

Patent Document 3: Japanese Patent Laid-Open Publication No. 2013-2706

An object of the present invention is to solve various problems as described above in a regenerative combustion apparatus including a regenerative burner which is heated by a heat storage material accommodated in a heat storage unit and passed through combustion air. The combustion air introduced into the furnace and the fuel supplied from the fuel supply nozzle are mixed and the fuel is burned in the furnace.

In other words, in the present invention, the combustion air that is heated by the heat storage material stored in the heat storage unit and guided to the furnace through the combustion air supply path and the fuel supplied from the fuel supply nozzle When the fuel is mixed and the fuel is burned in the furnace, the length of the flame at the time of combustion or the amount of NOx generated during combustion can be easily reduced.

In the regenerative combustion apparatus of the present invention, in order to solve the above problems, a combustion air that is heated by a heat storage material stored in a heat storage unit and guided to a combustion air supply passage is provided. And a regenerative combustion apparatus that is mixed with the fuel supplied from the fuel supply nozzle and that combusts the fuel in the furnace, and is configured to be guided from the heat accumulating unit to a cylindrical combustion air supply path. The combustion air is swirled from the inner circumference of the combustion air supply path, and is supplied from the air supply and exhaust port to the inside of the furnace through the combustion air supply path, and the fuel is supplied from the first fuel supply nozzle. The first fuel supply port provided in the furnace wall near the air supply and exhaust port supplies the inside of the furnace, and the combustion air and the fuel are mixed to burn the fuel in the furnace.

Further, in the regenerative combustion apparatus of the present invention, the combustion air system that is guided from the heat accumulating portion to the combustion air supply path that is in the tubular shape is swirled along the inner circumference of the combustion air supply path, and is supplied from the air supply. The exhaust port supplies the inside of the furnace, and the fuel is supplied from the first fuel supply nozzle to the inside of the furnace via the first fuel supply port provided in the furnace wall near the supply and exhaust port, and the fuel is supplied In the combustion in the furnace, the combustion exhaust gas system in the furnace is captured by the negative pressure generated in the central portion of the swirling flow of the combustion air supplied to the inside of the furnace by being swirled while being supplied to the air supply and exhaust port. When combustion is performed, the amount of NOx generated during combustion is lowered, and the fuel supplied from the first fuel supply port provided in the furnace wall near the gas supply exhaust port to the furnace is supplied in a wider range and in the gas supply. The exhaust port is mixed and combusted by the combustion air supplied to the furnace while swirling, and the flame at the time of combustion expands and the flame length is shortened.

Here, in the regenerative combustion apparatus, the first fuel supply nozzle may be disposed on both sides of the combustion air supply path, and the first fuel supply to the inside of the furnace may be supplied from the first fuel supply nozzles. The mouth is provided on both sides of the furnace wall near the gas supply and exhaust port. In this manner, the combustion air supplied to the furnace while swirling the air supply exhaust port and the first fuel supply port provided on both sides of the furnace wall near the air supply exhaust port are supplied to the furnace. The fuel can be uniformly mixed and burned on both sides of the gas supply vent, and the expansion of the flame at the time of combustion is more uniformly expanded.

Further, in the regenerative combustion apparatus, a second fuel supply nozzle for supplying fuel and a second fuel supply port may be provided in the combustion air supply passage in the vicinity of the air supply and exhaust port. In this manner, in the combustion air supply path, the fuel to be swirled is supplied with fuel from the second fuel supply port, and in the state where the fuel is mixed with the swirling combustion air, the combustion is first started and guided to the furnace. In the case where the fuel is supplied from the first fuel supply nozzle to the inside of the furnace through the first fuel supply port, the length of the flame becomes shorter, and the fuel is surely used for combustion in the combustion air path. The air is mixed, so that the flame can be prevented from being lost when the temperature in the furnace is low. Further, when the fuel is supplied from the first fuel supply nozzle to the inside of the furnace through the first fuel supply port, the combustibility at the time when the temperature in the furnace is low can be improved or the combustion can be performed. The amount of NOx generated is lowered, or the expansion of the flame at the time of combustion and the length adjustment of the flame are simply performed.

Further, in the regenerative combustion apparatus, the discharge portion of the tip end that discharges the fuel in the first fuel supply nozzle may be made porous. When the discharge portion for discharging the fuel in the first fuel supply nozzle is made porous, the fuel supplied to the furnace by the first fuel supply nozzle is dispersed and sprayed from the porous discharge portion. It can expand the flame expansion during combustion and shorten the length of the flame.

Further, in the above-described regenerative combustion apparatus, the combustion air is swirled from the inner circumference of the combustion air supply path, and is supplied from the air supply and exhaust port to the inside of the furnace through the combustion air supply path. At this time, the supply air exhaust port can be formed to expand toward the inside of the furnace. In addition, when the air supply and exhaust port is formed to expand toward the inside of the furnace, the combustion air is guided to the air supply and exhaust port while swirling along the inner circumference of the combustion air supply path. When the expanded air supply and exhaust port is swirled in a more expanded state, it is supplied to the furnace and mixed with the fuel, so that the flame at the time of combustion can be more greatly expanded and the length of the flame can be shortened.

In the regenerative combustion apparatus of the present invention, the combustion air is guided to the inside of the furnace by the heating air stored in the heat storage unit and is guided to the combustion air supply path along the combustion air supply path. The inner circumference is swirled, and the inside of the furnace is supplied from the air supply and exhaust port, and the fuel is supplied from the first fuel supply nozzle via the first fuel supply port provided in the furnace wall near the air supply and exhaust port. In the furnace, and the fuel is burned in the furnace, the combustion exhaust gas in the furnace is replenished in the central portion of the swirling flow of the combustion air supplied to the inside of the furnace as described above while swirling at the supply and exhaust port. And the combustion is performed, and the fuel supplied to the furnace from the first fuel supply port near the gas supply exhaust port is supplied to the furnace in a wide range with the swirling of the gas supply exhaust port. Mix with air and burn.

As a result, in the regenerative combustion apparatus of the present invention, the combustion air that is heated by the heat storage material stored in the heat storage unit and guided to the inside of the furnace via the combustion air supply path, and the fuel supply nozzle are provided. When the supplied fuel is mixed and the fuel is burned in the furnace, the shortening of the flame length at the time of combustion or the reduction of the amount of NOx generated during combustion can be easily performed.

10‧‧‧ furnace

11‧‧‧ furnace wall

20‧‧‧ Regenerative burner

21‧‧‧Air supply exhaust guide

22‧‧‧ Thermal Storage Department

22a‧‧·heat storage materials

23‧‧‧Combustion air supply path

23a‧‧‧Guide

23b‧‧‧ gas supply vent

31‧‧‧First fuel supply nozzle

31a‧‧‧First fuel supply port

31b‧‧‧Spray out

32‧‧‧Second fuel supply nozzle

32a‧‧‧second fuel supply port

Fig. 1 is a view showing a state in which a regenerative combustion apparatus according to an embodiment of the present invention is provided in a furnace and viewed from the outside of the furnace wall, and the combustion air is swirled along the inner circumference of the combustion air supply path. A partial diagram of the situation is illustrated.

Fig. 2 is a schematic partial explanatory view showing a state in which the regenerative combustion apparatus of the above-described embodiment is provided in the furnace and the inside of the furnace is viewed.

In the regenerative combustion apparatus of the above-described embodiment, the combustion air heated by the heat storage material stored in the heat storage unit is guided to the cylindrical combustion air supply path, and the combustion is performed. The air system is swirled along the inner circumference of the combustion air supply path, and is supplied from the air supply and exhaust port to the inside of the furnace through the combustion air supply path, and the fuel is supplied from the two first fuel supply nozzles. A partial cross section (AA line segment in Fig. 1) of a state in which the first fuel supply port provided on both sides of the furnace wall near the gas supply and exhaust port is supplied to the furnace and the fuel is burned in the furnace is illustrated.

In the regenerative combustion apparatus according to the above-described embodiment, the combustion air heated by the heat storage material stored in the heat storage unit is guided to a cylindrical combustion air supply path, and the combustion air system is used. While swirling along the inner circumference of the combustion air supply path, the fuel is supplied from the second fuel supply nozzle via the combustion air supply path, and is guided to the furnace while the fuel is mixed with the swirling combustion air. A partial cross-sectional explanatory view of a state in which it is burned.

Fig. 5 is a view showing a first modification of the regenerative combustion apparatus of the above-described embodiment, and shows that the end portions of the two first fuel supply nozzles are provided with a porous discharge portion for discharging fuel, and the fuel is supplied from each of the first A partial cross-sectional explanatory view of a state in which the discharge portion of the fuel supply nozzle is supplied to the inside of the furnace while being dispersed by the first fuel supply port, and the fuel is burned in the furnace.

Fig. 6 is a view showing a second modification of the regenerative combustion apparatus of the above-described embodiment, and is provided with a porous discharge portion for discharging fuel at the end portions of the two first fuel supply nozzles, and a combustion air supply path. In the middle, the air supply and exhaust ports for supplying combustion air into the furnace are formed in a state of being swirled, and are dispersed from the discharge portions of the respective first fuel supply nozzles via the first fuel supply port. In the state in which the fuel system supplied to the furnace is mixed with the combustion air supplied from the supply air exhaust port formed to extend into the furnace, and burned in the furnace, a partial cross-sectional explanatory view is shown.

Hereinafter, a regenerative combustion apparatus according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In addition, the regenerative combustion apparatus according to the present invention is not limited to the embodiment described below, and may be appropriately modified without departing from the scope of the invention.

In the regenerative combustion apparatus of the embodiment, as shown in FIG. 1 and the like, when the regenerative burner 20 is installed in the furnace 10, the combustion air is guided from the supply and exhaust guide pipe 21 to the heat storage. The heat storage unit 22 of the material 22a heats the combustion air by the heat stored in the heat storage material 22a in the heat storage unit 22.

In addition, the combustion air heated in the heat storage unit 22 is guided through the guide portion 23a so as to follow the inner circumference of the cylindrical combustion air supply path 23, and the combustion air is one. The inner circumference of the combustion air supply path 23 is swirled, and is supplied from the air supply and exhaust port 23b to the inside of the furnace 10 via the combustion air supply path 23.

Further, in the regenerative combustion apparatus according to the embodiment, as shown in FIG. 3 and the like, the first fuel supply nozzles 31 are provided on both sides of the combustion air supply passage 23, and the first fuel supply nozzles are provided. 31 is supplied to the inside of the furnace 10 via the respective first fuel supply ports 31a provided in the furnace wall 11 on both sides in the vicinity of the air supply exhaust port 23b.

Further, in the regenerative combustion apparatus of the embodiment, as shown in FIG. 4 and the like, the combustion air supply path 23 in the vicinity of the air supply and exhaust port 23b is provided with the second fuel supply nozzle 32 for supplying fuel and The second fuel supply port 32a supplies fuel to the combustion air that swirls from the second fuel supply port 32a along the inner circumference of the combustion air supply path 23, and thus the combustion air that supplies fuel and swirls is via the combustion air. The supply air exhaust port 23b is supplied to the inside of the furnace 10.

As shown in Fig. 3, in the regenerative combustion apparatus of the embodiment, the combustion air is supplied from the air supply and exhaust port 23b to the furnace 10 while swirling along the inner circumference of the combustion air supply path 23. Further, the fuel is supplied from the first fuel supply nozzles 31 to the furnaces 10 via the respective first fuel supply ports 31a provided on the furnace walls 11 on both sides of the vicinity of the air supply and exhaust ports 23b, and is supplied to the furnace 10, and combustion.

In this way, the combustion exhaust gas system in the furnace 10 is captured by the negative pressure generated in the central portion of the swirling flow of the combustion air supplied to the combustion chamber 10 while being swirled while being supplied to the air supply and exhaust port 23b. The combustion is performed, and the amount of NOx generated during combustion is lowered, and the fuel supplied to the furnace 10 from the respective first fuel supply ports 31a provided on both sides of the furnace wall 11 near the supply air exhaust port 23b is The combustion air supplied to the inside of the furnace 10 is mixed and burned in a wide range with the supply air exhaust port 23b, and the flame at the time of combustion expands and the flame length becomes short.

Further, as shown in Fig. 4, in the regenerative combustion apparatus of the embodiment, the combustion air swirled from the second fuel supply nozzle 32 along the inner circumference of the combustion air supply passage 23 is as described above. The fuel is supplied in the vicinity of the air supply and exhaust port 23b. When the combustion air that is supplied with fuel and swirled is guided into the furnace 10 through the air supply and exhaust port 23b, and the fuel is burned, the fuel system is from the foregoing A fuel supply nozzle 31 supplies the inside of the furnace 10 via the respective first fuel supply ports 31a provided on the furnace walls 11 on both sides in the vicinity of the supply and exhaust ports 23b, as compared with burning the fuel in the furnace 10. In this case, the flame length can be shortened, and the increase in flammability at a lower temperature in the furnace also avoids loss of flame.

In addition, as described above, the fuel is supplied from the respective first fuel supply nozzles 31 via the respective first fuel supply ports 31a provided on the furnace walls 11 on both sides of the vicinity of the supply and exhaust ports 23b. And the operation of burning the fuel in the furnace 10; and the combustion air swirling along the inner circumference of the combustion air supply path 23 from the second fuel supply nozzle 32 in the vicinity of the air supply exhaust port 23b The fuel is supplied, and the combustion air which is supplied with the fuel and swirled is guided into the furnace 10 through the supply air exhaust port 23b, and the fuel is burned; or, the operations are combined in an appropriate ratio. The flow rate is adjusted by a flow rate adjusting valve not shown in the figure, whereby the following adjustment is simply performed: the amount of NOx generated during combustion in the low furnace 10 is lowered, or the flame in the furnace 10 during combustion is lowered. Extended adjustments to shorten the flame length.

Here, in the regenerative combustion apparatus according to the above-described embodiment, the fuel is supplied from the front end of each of the first fuel supply nozzles 31 directly to the furnace 10 via the first fuel supply port 31a, as shown in Fig. 5. A discharge portion 31b having a porous shape may be provided at an end portion of each of the first fuel supply nozzles 31, and the fuel is supplied into the furnace 10 from the porous discharge portion 31b. In this manner, the fuel is dispersed from the porous discharge portion 31b and injected through the first fuel supply port 31a, so that the expansion of the flame in the furnace 10 during combustion can be further enlarged, and the length of the flame can be shortened.

Further, in the regenerative combustion apparatus according to the above-described embodiment, as shown in FIG. 6, the combustion air is swirled along the inner circumference of the combustion air supply passage 23, and the combustion air supply passage 23 is passed through the combustion air supply passage 23 When the combustion air is supplied into the furnace 10 from the air supply and exhaust port 23b, the air supply and exhaust port 23b can be formed to expand in the furnace 10 as shown in the figure.

In this manner, the combustion air that is guided to the air supply and exhaust port 23b while swirling along the inner circumference of the combustion air supply path 23 expands the formed air supply port 23b toward the inside of the furnace 10. The more expanded state is supplied to the furnace 10 while being swirled, and is mixed with the fuel, so that the flame at the time of combustion can be more greatly expanded and the length of the flame can be shortened.

Further, in the regenerative combustion apparatus according to the above-described embodiment, the first fuel supply nozzles 31 are provided on both sides of the combustion air supply passage 23, and the first fuel supply nozzles 31 pass through the supply air exhaust ports. The first fuel supply port 31a provided in the furnace wall 11 on both sides in the vicinity of 23b is supplied to the inside of the furnace 10, but the number of the first fuel supply nozzle 31 and the first fuel supply port 31a is not particularly limited. Further, a first fuel supply nozzle 31, a first fuel supply port 31a, or a first fuel supply nozzle 31 or a first side may be provided on only one side of the combustion air supply path 23 or the supply air outlet 23b. Fuel supply port 31a.

Further, in the regenerative combustion apparatus of the above-described embodiment, each of the first fuel supply nozzles 31 on both sides of the combustion air supply path 23 is inclined so as to face the supply air exhaust port 23b, but only The combustion air that is swirled by the air supply and exhaust port 23b and supplied into the furnace 10 is appropriately mixed with the fuel supplied from the first fuel supply nozzle 31, and the first fuel supply nozzle 31 and the combustion may be used. The air supply path 23 is disposed in parallel.

Further, in the present embodiment, the combustion air is supplied from the air supply and exhaust port 23b and burned by the flame. However, in the regenerative combustion apparatus, of course, the air supply and exhaust guide are provided at a certain time interval. The flow path of the guide pipe 21 is switched and exhausted from the air supply exhaust port 23b to store heat of the exhaust heat of the heat storage material 22a.

Claims (5)

 A regenerative combustion apparatus is provided with a regenerative burner that is heated by a heat storage material stored in a heat storage unit and guided to combustion air in a furnace via a combustion air supply path, The regenerative combustion equipment system is configured to mix with the fuel supplied from the fuel supply nozzle and to combust the fuel in the furnace. The combustion air is guided from the heat accumulating portion to the combustion air serving as the cylindrical combustion air supply path. While swirling along the inner circumference of the combustion air supply path, the combustion air supply path is supplied from the air supply and exhaust port to the inside of the furnace, and the fuel is supplied from the first fuel supply nozzle through the aforementioned The first fuel supply port provided in the furnace wall near the gas supply and exhaust port supplies the inside of the furnace, mixes the combustion air and the fuel, and burns the fuel in the furnace.    The regenerative combustion apparatus according to claim 1, wherein the first fuel supply nozzle is disposed on both sides of the combustion air supply path, and fuel is supplied to the furnace from each of the first fuel supply nozzles. The first fuel supply port is provided on both sides of the furnace wall in the vicinity of the air supply and exhaust port.    The regenerative combustion apparatus according to claim 1 or 2, wherein the combustion air supply path in the vicinity of the air supply and exhaust port is provided with a second fuel supply nozzle and a second fuel supply port for supplying fuel.    The regenerative combustion apparatus according to claim 1 or 2, wherein a front end portion of the first fuel supply nozzle is provided with a porous discharge portion, and the fuel is dispersed from the discharge portion to the furnace Supply.    The regenerative combustion apparatus according to claim 1 or 2, wherein the combustion air supply path is bypassed from the air supply and exhaust port while being swirled along the inner circumference of the combustion air supply path When the inside of the furnace is supplied, the supply air exhaust port is formed to expand toward the inside of the furnace.