JP3511586B2 - Single-type heat storage combustion equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus (single-type regenerative combustion apparatus) provided with a single-type regenerative combustion burner.
About. [0002] Japanese Patent Application Laid-Open No. 8-166123 describes the structure of a single-type regenerative combustion burner. There, a single-type regenerative combustion burner has a burner tile at its tip, and this burner tile has a protrusion protruding from the supply / exhaust surface to the combustion chamber side of the furnace, and a fuel release surface inside the tip. have. Combustion air (supply air) flows along the side surface of the protrusion. However, since the air discharged from the air supply port on the air supply / exhaust surface flows in the axial direction of the protrusion, only the portion in contact with the air is cooled. Since it is not cooled over the entire circumference, it is not very effective for cooling the burner tile. In the above publication, FIG. 10 shows a burner provided with a sub-combustion cylinder having a narrowed tip and an exhaust gas inlet at the base. However, the purpose of narrowing the tip of the sub-combustion cylinder is to prevent the spread of air and stabilize combustion, and is not intended to cool the burner. [0003] When a conventional single-type regenerative combustion burner is used in a high-temperature furnace having an in-furnace temperature of 1300 to 1400 ° C, it is exposed to the in-furnace atmosphere.
In addition, it is necessary to improve the heat resistance of the burner tip portion (burner tile having a supply / exhaust surface, a supply / exhaust port, and a protruding portion in the case of a conventional burner structure) that is brought into contact with the exhaust gas returned to the burner at high temperature. Therefore, if the burner tile material is changed from metal to non-metal, for example, ceramic, processing becomes difficult and it becomes difficult to obtain dimensional accuracy. If the burner tile material is left as metal, the endurance temperature of the heat-resistant metal is about 1000 ° C. As a result, there arises a problem in terms of durability, or a problem that a metal that can withstand more than that is developed and used becomes too expensive. An object of the present invention is to use a single-type regenerative combustion burner having a heat-resistant temperature of about 1000 ° C. (thus, a burner whose burner tip can be made of metal) in a furnace having an in-furnace temperature of 1300 to 1400 ° C. An object of the present invention is to provide a single-type regenerative combustion apparatus that can be used. The present invention for achieving the above object is as follows. (1) Single-type heat storage combustion burner and the single-type heat storage
Single-type heat storage combustion formed separately from the thermal combustion burner
Burner tile with a burner mounting hole where the burner is mounted
The single-type regenerative combustion burner consists of
The fuel is located downstream of the air surface and the air supply / exhaust surface in the air supply flow direction.
The burner tile is a thin part.
Fuel gas and supply air from a glu-type regenerative combustion burner in the furnace
The first hole to flow out into the furnace and the exhaust from the furnace
The second heat storage combustion burner is circulated to the air supply / exhaust surface.
And the first hole is the single-type storage.
Surrounds the supply / exhaust surface of the thermal combustion burner and the downstream side of it
And the downstream part of the first hole is
Are squeezed than the upstream side portion, between the single-type regenerative combustion burner and burner mounting hole inner peripheral surface of the burner tile gap burner cooling air is introduced is formed, single-type regenerative Combustion device. In the single-type regenerative combustion apparatus of (1), since the first hole of the burner tile is throttled in the downstream portion, the flow resistance in the throttled downstream portion is increased, and the combustion air A part of the (air supply) is short-passed to the exhaust port on the air supply / exhaust surface, the tip of the burner is air-cooled, and overheating inside the burner (heat storage, burner internal mechanism, supply / exhaust switching machine, etc.) is also prevented. The About 1000 ° C
Even with a single heat storage combustion burner with heat resistance, the furnace temperature is 1
It can be used as a furnace burner that can reach 300 to 1400 ° C. In the single heat storage combustion apparatus of ( 1 ) above, a gap is formed in which the burner cooling air is introduced. Therefore, the burner cooling air is mixed with the exhaust gas returned to the supply / exhaust surface to lower the exhaust gas temperature and circulate In addition to preventing overheating of the burner tip contacting the exhaust gas, the burner cooling air and a part of the combustion air short-passing to the exhaust port prevent overheating inside the burner and improve reliability. Also,
The exhaust gas can be directly recirculated to the combustion air, the flame temperature can be lowered, the NOx can be reduced, the flame can be extended by slowing the combustion, and the furnace temperature can be made uniform. it can. DESCRIPTION OF THE PREFERRED EMBODIMENTS A single type heat storage combustion apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the single heat storage combustion apparatus 1 of the embodiment of the present invention includes a single heat storage combustion burner 10 and a burner tile 20 that is separate from the single heat storage combustion burner 10. The burner tile 20 has a burner mounting hole 23,
The single heat storage combustion burner 10 is mounted in the burner mounting hole 23. The burner tile 20 has a heat resistance of about 1300 ° C. or higher, for example, a refractory (for example, ceramic).
Consists of. The single-type regenerative combustion burner 10 is provided in order from the upstream side to the downstream side in the supply air flow direction.
Supply / exhaust switching mechanism 11, heat storage body 12, and burner tip 1
It consists of three. The single-type regenerative combustion burner 10 has about 1
What is necessary is just to have heat resistance of 000 degreeC or more, and the burner front-end | tip part 13 is metal, for example (however, it may be made from a ceramic). The supply / exhaust switching mechanism 11 switches between supply / exhaust by rotating around the axis. The heat storage body 12 is made of a honeycomb body and takes exhaust heat when the exhaust gas passes to store the heat, and radiates heat when the air supply (combustion air) passes to preheat the air supply. Fuel gas passes through the center of the heat storage body 12, pilot air passes through it, and supply / exhaust air passes through the outside.
Reference numeral 19 denotes a spark portion. The burner tip 13 has an air supply / exhaust surface 14 where the air supply / exhaust port 18 is opened, and a fuel release portion 15 which is located downstream of the air supply / exhaust surface 14 in the air supply flow direction and releases the fuel gas.
And having. The air supply / exhaust port 18 passes air supply or exhaust. The burner tip 13 only needs to have a heat resistance of about 1000 ° C., and is made of metal, for example. The burner tile 20 is made of a refractory material and is attached to the furnace wall of the furnace 30. The burner tile 20 surrounds the burner tip 13 (and the heat storage body 12 part) of the burner 10 from the outer peripheral side. The burner tile 20 supplies fuel gas and supply air from the single-type regenerative combustion burner 10 in the furnace 3.
1 and a second hole 22 for circulating the exhaust from the furnace 31 to the supply / exhaust surface 14 of the single-type regenerative combustion burner 10. The inner peripheral surface of the first hole 21 is an air supply / exhaust surface 14 of the single-type regenerative combustion burner 10.
And the part downstream from it. The downstream portion 21 a of the first hole 21 is narrower than the upstream portion 21 b of the first hole 21. The downstream portion 2 of the first hole 21 that has been narrowed down
1a is a supply / exhaust surface 14 of the single-type regenerative combustion burner 10
It is located downstream of the air supply flow direction. Fuel release portion 15 of burner tip 13 of single-type regenerative combustion burner 10
Is positioned downstream of the downstream portion 21a where the first hole 21 is narrowed in the flow direction of the supply air. Thereby, the air supply passage between the inner peripheral surface of the downstream portion 21a in which the first hole 21 is narrowed and the outer peripheral surface of the fuel release portion 15 is
Compared with the upstream portion 21 b of the first hole 21, the passage cross-sectional area is reduced. The 1st hole 21 is restrict | squeezed by the reducer shape (taper shape) from the upstream part 21b to the downstream part 21a. The second hole 22 of the burner tile 20 is a first hole.
A plurality of holes 21 are provided at equal intervals in the circumferential direction. One end of the second hole 22 of the burner tile 20 is open to a portion that forms the furnace inner surface 25 of the burner tile 20, and the other end of the second hole 22 is a portion on the air supply / exhaust surface 14 of the first hole 21 or a downstream portion thereof. Is open. As a result, the second hole 22 causes the exhaust gas from the furnace 31 to flow in the vicinity of the supply / exhaust surface 14 of the burner 10 without forming a counterflow with the flow of fuel gas and supply air (combustion air) ( It is returned to the portion slightly downstream from the air supply / exhaust surface 14 in the air supply flow direction. Heat storage body 2 of single type heat storage combustion burner 10
Between the outer peripheral surface of the two storage portions and the inner peripheral surface of the burner mounting hole 23 of the burner tile 20, a gap (burner cooling air introduction path) 24 into which burner cooling air is introduced is formed. The air for cooling the burner is introduced from the outside by a blowing means (not shown). The first hole 21, the second hole 22, and the gap (burner cooling air introduction path) 24 communicate with each other. [0013] Next, a description will be given for the work of the present invention. The single-type regenerative combustion burner 10 has combustion main air (supply air)
Is preheated by the heat storage body 12 and blown out from the air supply / exhaust surface 14. On the other hand, the fuel gas is blown out from the fuel release portion 15 together with the pilot air. The fuel gas is ignited in the spark part 19,
Mixed with the main combustion air downstream of the fuel opening 15;
It flows out into the furnace 31 through the first hole 21 of the burner tile 20, forms a flame in the furnace 31, and burns. The combustion gas returns in the furnace 31 toward the regenerative combustion burner 10, and returns from the lateral direction with respect to the flow direction of the supply air to the vicinity of the supply / exhaust surface 14 through the second hole 22 of the burner tile 20. A part of the exhaust gas flows downstream in the supply air flow direction along with the supply air and recirculates in the furnace 31, and the rest flows to the heat storage body 12 through the supply / exhaust port 18 working as an exhaust port.
2 is deprived of heat and the temperature drops, and is released to the atmosphere through the supply / exhaust switching mechanism 11. Since the exhaust gas is returned to the single-type regenerative combustion burner 10, the combustion main air is diluted with the exhaust gas,
Combustion slows down, NOx production decreases, and the flame extends longer. Accordingly, the temperature difference in the furnace 31 is reduced, the furnace temperature is substantially uniform over the entire region, and the furnace 31 can be heated uniformly. Further, since the exhaust gas is returned through the second hole 22 of the burner tile 20 to the supply / exhaust surface 14 portion of the single-type regenerative combustion burner 10 or its vicinity, the return flow of the exhaust gas burns through the first hole 21. Therefore, the main air does not flow counter to the main air flow and can be smoothly returned to the supply / exhaust surface 14 or its vicinity, and the exhaust can be circulated effectively. When a throttle part is provided in the downstream portion 21a of the first hole 21 of the burner tile 20, and the fuel release part 15 is positioned at the throttle part or downstream thereof, the passage cross-sectional area of the combustion air becomes the fuel. It becomes the area of the annular passage between the outer diameter of the open portion 15 and the inner diameter of the throttle portion of the downstream portion 21a of the first hole 21, and the cross-sectional area of the passage is reduced. As a result, the flow resistance of the combustion air is increased, and a part of the combustion air is short-passed from the port serving as the supply port of the supply / exhaust port 18 to the port serving as the exhaust port of the supply / exhaust port 18. , Mix with exhaust gas, lower the temperature of exhaust gas,
The exhaust gas is discharged from the supply / exhaust port 18 together with the exhaust gas, and the remainder flows downstream as combustion air together with the circulating exhaust gas, and is mixed with the fuel gas and burned. Although a part of the combustion air that is short-passed is preheated when passing through the heat storage body 12, the temperature is lower than that of the exhaust gas (for example, when the exhaust gas passes through the heat storage body, it is preheated at 800 ° C. Combustion air is 700 ° C.), the fuel opening 15, the burner tip 13 including the air supply / exhaust surface 14, and the burner interior (such as a heat storage body) are automatically and effectively cooled to a temperature of 1000 ° C. or less, for example. When the burner tip 13 is cooled by the short pass air, the burner 10 having a heat resistance of 1000 ° C. can be used as the burner of the furnace 30 having a furnace temperature of 1300 ° C. to 1400 ° C. Improves durability. Further, a gap 24 is formed between the outer peripheral surface of the heat storage body 22 housing portion of the single type heat storage combustion burner 10 and the inner peripheral surface of the burner mounting hole 23 of the burner tile 20, and the atmospheric temperature is passed through the gap 24. When the burner cooling air is introduced, the burner cooling air is mixed with the exhaust gas to lower the exhaust gas temperature, so that the burner tip 13 and the burner 1
The inside of 0 is further cooled, and durability and reliability are improved. Furthermore, there is an effect of directly cooling the burner from the outside by introducing the air for cooling the burner along the side surface of the burner as shown in FIG. According to the single heat storage combustion apparatus of the first aspect, since the first hole of the burner tile is restricted at the downstream portion, the flow resistance at the restricted downstream portion is reduced. A part of the combustion air (supply air) is short-passed to the exhaust port on the supply / exhaust surface, and the burner tip is cooled by the short-pass air, and the burner interior (heat storage, burner internal mechanism, supply / exhaust) The overheating of the switching mechanism or the like is also prevented. As a result, even a single-type regenerative combustion burner having a heat resistant temperature of about 1000 ° C. can be used as a furnace burner having an in-furnace temperature of 1300 to 1400 ° C. In addition, since a gap is formed to introduce the burner cooling air, the burner cooling air is mixed with the exhaust gas that is returned to the supply / exhaust surface to lower the exhaust gas temperature, and the overheating of the burner tip contacting the circulating exhaust gas is prevented. In addition to preventing the burner cooling air and a part of the combustion air that short-passes to the exhaust port, it prevents overheating inside the burner and improves reliability. In addition, exhaust gas can be directly recirculated to combustion air, flame temperature can be lowered, NOx reduction can be achieved, combustion can be slowed down, flame can be extended, and furnace temperature can be made uniform be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a tip of a heat storage combustion burner and a burner tile of a single type heat storage combustion apparatus according to an embodiment of the present invention. 2 is a cross-sectional view of the apparatus of FIG. 1 along the line AA. FIG. 3 is a cross-sectional view of a heat storage combustion burner of a single type heat storage combustion apparatus according to an embodiment of the present invention. [Description of Symbols] 1 Single-type regenerative combustion apparatus 10 Regenerative combustion burner 11 Supply / exhaust switching mechanism 12 Regenerator 13 Burner tip 14 Supply / exhaust surface 15 Fuel release part 18 Supply / exhaust port 19 Spark part 20 Burner tile 21 First hole 21a Downstream portion (throttle portion) 21b Upstream portion 22 Second hole 23 Burner mounting hole 24 Clearance 25 Burner tile furnace inner surface 30 Furnace 31 Furnace

──────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiko Nishiyama 1-132 Nishimachi, Toyota City, Aichi Pref. 132 (in) Terra Corporation (72) Inventor Satoru Sugito 1-715 Taisho-cho, Kariya City, Aichi Pref. Sugiyama (56) References JP-A-5-114309 (JP, A) JP-A-10-205744 (JP, A) JP-A-8-247410 (JP, A) JP-A-7-27386 (JP , A) JP-A-6-288520 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23L 15/02 F23C 9/08 303 F23L 15/00

Claims (1)

(57) [Claims] [Claim 1] Single-type regenerative combustion burner and said single
The single heat storage combustion burner is formed separately from the single heat storage combustion burner.
Burner having a burner mounting hole in which a thermal combustion burner is mounted
And the single-type regenerative combustion burner comprises a supply / exhaust surface and the supply / exhaust surface.
A fuel release portion located downstream of the air surface in the direction of air supply flow,
The burner tiles from a single heat storage combustion burner
A first hole through which fuel gas and supply air flow into the furnace;
Exhaust from inside is supplied to the single-type regenerative combustion burner.
A second hole circulating to the exhaust surface, and the second hole
1 hole is the supply / exhaust surface of the single-type regenerative combustion burner
And a portion downstream of the first hole and below the first hole
The flow side portion is narrower than the upstream side portion of the first hole.
Ri, between the single-type regenerative combustion burner and burner mounting hole inner peripheral surface of the burner tile gap burner cooling air is introduced is formed, single-type regenerative combustion apparatus.