JPS5860111A - Ceramic burner for high temperature - Google Patents

Abstract

PURPOSE:To obtain stable characteristics in a burner even in high temperature, by using a ceramic which is durable to the thermal shock for the material to make a protective cylinder and an air nozzle, and by making the joint part of a ceramic with a metal part in a structure not being affected by expansion difference. CONSTITUTION:A burner body is composed in such a manner that a fuel gas pipe 1 is provided in the center part, around which air pipes 7 are provided at regular intervals, and surrounding the air pipes 7, a protective cylinder 18 is provided. The air pipe 7 has an air nozzle 9, which is joined to the tip of an air pipe 7 by an air nozzle fitting member 8. A cooling air ventilating channel 22 is formed on the external periphery of an air nozzle fitting member 8. In this case, a protective cylinder 18 and an air nozzle 9 are made of ceramic material. By using this material, stable characteristics can be obtained in a burner even in high temperature, and at the same time, the burner can be used for a long time with a small rate of air even in an air-cooled mode.

Description

Detailed description of the invention This invention @ 11 degrees inside the welfare furnace 1.400't: -1,900c
c (Regarding the improvement of the burner mechanism used in D-high Br) The object of the present invention is to provide an energy-saving gas/four-stove that reduces heat loss from the burner section.

1.400 cc~I, 900°cOi111F, 4
111C) The conventional burner used in the 71Jl' run has a high temperature of 1s from inside the furnace of 1.4000C to 1.900℃ and a temperature of 55G'e -1,200℃.
A water-cooled pipe is also used to protect the burner tip from the high secondary air.

Furthermore, recently, as part of energy conservation, waste gas sensible heat is increasingly being recovered and used as secondary air for combustion), and as a result, as the temperature of secondary air for combustion increases,
In conventional burners with metal nozzles, the lifespan of high-temperature oxidation forces has been shortened.In order to protect the tip of the burner from high temperatures, many of these types of burners adopt a water-cooling system. are doing.

However, such water-cooled burners have the following drawbacks. In other words, the heat loss due to water cooling is as high as 8,000 to 12,000 Kcal/hr per burner, and there are also problems such as leakage of water cooling pipes and carbon adhesion to the tips, which requires a lot of effort to maintain and manage the Sipana. I need. For example, in the case of a tunnel kiln with 16 burners, the total water cooling heat loss is 128.000 to 192.0.
00 Kcal/hr. Even if a water-cooling system is adopted, the service life is short when used in a high-temperature furnace, and the Kd is unsuitable for long-term use.

The present invention has been made in order to solve the above-described various quantities m of the water-cooled burner.

When a high-temperature burner is not water-cooled, a high-temperature refractory material is required in place of metal. Ceramic materials are generally considered for this, but ceramic materials (1)
Weak against thermal shock (2) There is a problem of damage caused by the difference in expansion between metal and ceramic materials. For this reason, we considered using ceramic material for the tip end and outer peripheral retaining cylinder of each member constituting the burner. In order to suppress the influence, 1. The ceramic material used in the present invention is made of a material that can sufficiently withstand thermal shock, and the joint part with the metal has a structure in which the difference in expansion does not have a relatively negative effect. Furthermore, this burner is characterized by a structure that has a sufficient air cooling effect by using a small amount of cooling air to reduce heat accumulation in the inner metal part and prevent overheating.

Next, an embodiment of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a partial longitudinal section of an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of the tip of FIG. 111.

The burner according to the present invention has a fuel gas pipe 1 provided in the center as shown in the figure, an air nove 7 is provided around the outer circumference K and the space between the legs txt, and a certain gap is provided at the outermost shoulder. air cooling)
The fuel gas nozzle 1 has a fuel gas nozzle 6 connected to it by a fuel gas nozzle attachment member 2 at its tip, as shown in FIG.

A primary air vent 141 is formed on the outer periphery of the fuel gas nozzle mounting member 2 ``K Fi, and the outer periphery of the chain part partially contacts the inner surfaces of the air nozzle 7 and the air nozzle mounting member 8 and the air nozzle 9. .

A primary air groove 12 is formed on the outer periphery of the fuel gas nozzle 6, and when the outer periphery of the # part is attached to the fuel gas nozzle mounting member 2, it partially contacts the inner surface of the air nozzle 9. Furthermore, a primary air vent 14 is drilled in the wall iii of the fuel gas nozzle 6, and an insert joined within the fuel gas nozzle 6;
It communicates with a central jet hole 15 formed at the tip of the member 4. A fuel gas passage groove 5 is formed in a part of the outer circumference of the inosert member 4, and the outer circumference of the chain part partially contacts the inner surface of the fuel gas nozzle 6. 6Fi fuel gas nozzle.

As shown in @2&J, the air master tube 7 has an air nozzle 9 connected to its tip by an air nozzle attachment member 8. A cooling air ventilation groove 22 is formed on the outer periphery of the air nozzle mounting member 80, and the outer circumferential surface of the armpit portion is the tip of the air cooling nozzle 16! ! It is partially abutted against the inner surface of the eel protector 16 connected by the thread member 17. 1s is a primary air outlet. The centering member 10 has a cooling air ventilation groove 21 on the outer periphery at the middle part of the entire length of the air guide 7, and the outer circumferential surface of the armpit part is connected to the connecting member 17. Partial KJllI on the inner surface of
I will be treated.

Air cooling model 16 having cooling air branch holes 20 on the circumference
A ventilation groove 67 is formed in the columnar member 17 and the tube receiving piece of the columnar member 17, which are connected to each other by the membrane retaining cylinder 18Iri connection member 17, and the burner mounting member s1 is formed.
The inner surface and the outer circumferential surface of the portion are partially in contact with each other. Safety bullet 18
A must for the tip of the eyelid! The heat insulating cover 19 may be fixed depending on the situation.

The two ink are cooling air vents. Oil pipe 1゜air arm ide 7. The opening IB at each base end of the air-cooled arm eve 16 is connected to the fuel gas pipe 24 . -Next air piping 26, air cooling piping 2
It is joined with 9. 28#i is an air cooling pipe additional member, and 25 is an air nozzle mounting member.

The nozzle main body constructed as described above is set in the furnace 1159 using the box-shaped paddle mounting member 61 as shown in FIG. 46 is a throat portion, 41 is a secondary air passage, and 42 is a secondary air chamber. The outer periphery of the paddle attachment member 1 inside the furnace is surrounded by a heat insulating material 32 to protect it from high IIXM air from the inside of the furnace 44. 58 is provided between the burner protection cylinder 18 and the heat insulating material s2. The burner body is a conical columnar space.The method of attaching the burner body to the furnace wall &9 is to use the connecting member 17 from the outside of the furnace 11M of the mounting member 1 which is fitted in advance to the furnace wall 69. Insert the outer periphery of the connected part sweet air groove IS7 while inscribing it into the inner surface of the burner mounting member IS1, and glue the sealing material holding fitting 66 with the sealing material ink 4 inside by screwing or other method, and set it. Ill tilt the burner body with bolt 65? Fix it. &6 is the space formed by the burner mounting member 31 and the air cooling hole 14.The burner constructed as described above has a length of about 1000 mm.
The outer diameter of the -2 protection III cylinder 18 has a dimension of approximately 70 mm.

In this case, the fuel gas is supplied from the fuel gas pipe 24, and the fuel gas is supplied from the fuel gas pipe 24. The primary air is sprayed through the primary air pipe 26 through the fuel gas passage 1115 inside the fuel gas nozzle through the fuel gas nozzle 1. The primary air is sprayed through the primary air pipe 26.
# / 312 pressure is supplied to the air! Passing through the interior of the idea, the primary 9 air passes 11 and the night air groove 12 passes through the air, -
Large air vent 1 ink) is ejected. Also, the part passes through the primary air vent 14 and is ejected from the central jet hole 1S.
The control valve 27 controls the amount of air at night.

Cooling air is from cooling air pipe 29 to 200-400-H2
It is supplied at a pressure of Q, and the amount of cooling air is set to 0. Cooling air required to be supplied #
i, through the inside of the air cooling Δ Eve 16, a part of which passes through the cooling air branch hole 20, passes through the connection member ventilation $57 in the connection member 17 to the space 66, and passes through the space Sat to the secondary air chamber. 42
The cooling air that has passed through the cooling air branch hole 20 into the ζ0@ is heated while suitably cooling the connecting member 17, a part of the protective tube 18, and a part of the paddle mounting member 111, and is heated for combustion. The remaining cooling air, which is used as part of the air, passes through the cooling air vent W21 above the centering member 1o, and the protection tube 18. Air tii f7. Air nozzle mounting member 8. It passes through the air/Ikg while exchanging cooling heat, is ejected from the cooling air outlet 2iS, and becomes part of the combustion air/air.
・Inside the cooling air branch hole 20 of the 9-in-1 mounting member 31, seal with the sealing material 114 installed inside the space & 6 sealing material retaining metal fittings so that the cooling air does not leak out of the furnace. be done. High temperature secondary air (1,200~550cc)
enters the secondary air 1142 through the secondary air passage 41,
It passes through the throat section 4 inside the burna mail 40 and enters the furnace interior 44.

Protective tube 18. Air nozzle 9Fi (ceramic material such as silicon nitride), ultra-high temperature furnace (1,400~1.go).

These protective tubes can be used stably for a long time even at
．． The air nozzle 9 has a structure that allows it to be installed and replaced by a wild bird using the O0O connecting member 17 and the air nozzle mounting member 8. Due to the above structure and configuration, the cooling air is ultimately converted into combustion air. However, regardless of the amount of fuel ffi,
1011111 11 is determined by the air temperature, and it can be sufficiently effective with a small amount.According to the results of an ultra-high temperature tunnel run in a single air @ID* paper, the total amount of primary air and cooling air is .

The theoretical combustion air amount is in the range of 1O to IIIG), and if this ratio is 25 degrees or more, it is not favorable from the point of view of energy saving.

The burner of the present invention had the following effects.

■ Ceramic material is used for the protection tube and air nozzle, making it stable and compatible even at high SL.
Moreover, with the reform of the cooling method, long-term use is possible with a small amount of air even with an air-cooling system.

'■ As a result of the above (■), the cooling heat loss is greatly reduced and the fuel (oil) is approximately 7 O energy saving compared to when using a conventional water-cooled burner.

■ Water-cooling equipment is a military expense, and in terms of maintenance and management of burners, conventional C burners are still expensive.

Therefore, the ceramic burner of the present invention is suitable for use in oairi lagoon atmosphere furnaces other than tunnel kilns.

[Brief explanation of drawings]

Fig. II1 is a partial vertical sectional view showing an embodiment of the high temperature ceramic burner of the present invention, and Fig. 2 is an enlarged longitudinal sectional view of the tip of Fig. 1. In the figure, 1 is a fuel gas/mother tube; 2 is the fuel gas nozzle mounting member, black is the fuel gas nozzle,
4Fi insert member 1.5 is a fuel gas passage It,
7 #i air nozzle, aFi air nozzle mounting member, 9 is air nozzle, 10 is centering member,
11 is the primary air ventilation groove, 12 is the primary air piping 1
4 is the primary air vent, 15 is the central ejection hole, 16
is air-cooled 9ig, 17. are connection members, 18#i protection tube, 2QU cooling air branch hole, 21 is cooling air ventilation groove, 22 is cooling air ventilation groove, 24 is fuel gas piping, 26 is primary air piping, 29 is air cooling piping.

Claims (1)

[Claims] In the center of the burner, at its tip, a central jet hole is formed inside through a fuel gas nozzle mounting member formed with a secondary air vent on the outer periphery, and a nine insert member communicates with the primary air vent; An air groove is formed in a part of the built-in outer periphery across the fuel gas passage groove, and a fuel gas nodive consisting of a fuel I nozzle mounting part is provided, and the fuel gas/f i!
Provide an appropriate distance between the outside of the fuel gas pipe and the fuel gas pipe.
Cooling air ventilation W? '・A ceramic air nozzle is brazed through the air nozzle mounting member and is air cooled; an air nozzle is provided with a centering member with a cooling air ventilation groove formed inside the connection member between the air nozzle and the test tube. and
On the outside of the air outlet, two JIO protection tubes are attached to the inside of the furnace via connecting members, and an air cooling outlet is provided with cooling air branch holes. , an air/arm f, and each proximal end m of an air-cooled pipe are configured to be connectable to a fuel gas pipe, a secondary air pipe, and an air-cooled pipe, respectively.