KR200319201Y1 - Air cooling type industrial burner - Google Patents

Abstract

The present invention is to provide an air-cooled industrial burner that is equipped with an internal air bulkhead, air-cooled crater baffle and a crater exterior member to enable excess air injection to increase burner capacity and burner combustion control range.

The air-cooled industrial burner of the present invention includes an air-cooled crater exterior member 230 coupled to the housing flange 101 of the burner housing 100 by a crater flange 201; In the inside of the crater exterior member 230, a disk-shaped flame plate 240 coupled to the nozzle tip 121 of the fuel supply pipe 120 is formed at one edge thereof, and at least one circumferential through hole 223 is formed. It has a crater baffle 220 which penetrates the main surface, and has at least one or more baffle supports 221 and 222 extending radially, respectively, vertically bent at opposite edges to contact the inner surface of the crater exterior member 230. Including the crater assembly 200, by installing the internal air partition wall 140 in the burner housing 100, radially injects excess air supercharged into the burner housing 100, radially injected air Passes the air cooling space 232 formed between the crater exterior member 230 and the crater baffle 220.

Description

Air Cooled Industrial Burner {AIR COOLING TYPE INDUSTRIAL BURNER}

The present invention relates to an air-cooled industrial burner, and to a large-capacity, high-efficiency air-cooled industrial burner used for preheating and heating steel mill facilities such as ladle, tundish, and torpedo car. It is about.

Industrial burners typically use burner fuels such as LPG, LNG, COG, OIL, and have capacities from hundreds of thousands to millions of kilocalories, and are custom made according to the application.

For example, industrial burners are used in various furnaces in steel mills to gradually raise the furnace temperature from several hundred degrees Celsius (600 to 900 degrees Celsius) to thousands of degrees Celsius (1000 to 2900 degrees Celsius).

These industrial burners have a large hot water, a passage for separating and transporting molten iron and slag in a blast furnace making process, a ladle, a container receiving molten steel or molten steel, and a tundish for storing and stabilizing molten steel between ladles and molds. In addition, it is used to heat the crosstalk car carrying the molten iron from the steelmaking process to the steelmaking process.

The industrial burner according to the prior art is capable of heating the entire surface of the tundish inner floor and walls to a uniform temperature at maximum combustion load for playing tundish preheating and heating, as shown in FIGS. 1A and 1B. .

To this end, a conventional industrial burner has a cylindrical burner body 1 and a crater 5. In the axial direction of the burner body 1, the fuel pipe 2 into which burner fuel is injected is arranged so as to penetrate from the outside to the inside, and at the end of the fuel pipe 2, a fuel nozzle having a nozzle hole 7a for ejecting flames. (7) is attached, and the fuel nozzle 7 is arrange | positioned at the axial center of the crater 5.

On the circumferential surface of the burner body 1, an external air pipe 3 for sucking air from the outside of the burner into the burner is piped. In addition, an inner air pipe 4 is formed at the center of the fuel pipe 2 so that the outside air sucked from the outside air pipe 3 side can be sucked back and discharged from the axis of the fuel nozzle 7 at the center of the fuel pipe 2. Plumbed in

The crater 5 is formed of a refractory that can withstand hundreds of degrees, and is coupled to the flame plate 8 around the fuel nozzle 7 to improve uniform heating.

This crater 5 radially forms a plurality of first air holes 6a through which the holes of the flame plate 8 penetrate the inside of the burner body 1, and around the first air holes 6a. A plurality of second air holes 6b are further formed. In addition, although not shown, the burner body 1 is further provided with an ignition device capable of igniting a flame in the fuel nozzle 7.

Such industrial burners of the prior art have a capacity of 20,000 mW / h to 600,000 mW / h and have an excess air ratio (air: fuel gas) of up to about 500%.

However, since the conventional industrial burners use refractory materials that can withstand the material at a predetermined temperature, the refractory material of the fireball is increased when the amount of air supplied through the first and second air holes is excessively increased to increase thermal efficiency. There is a disadvantage in that it can not withstand the high temperature and is damaged, and accordingly, the present invention is limited to a tundish preheating facility that heats the furnace temperature to about 700 ° C.

That is, when used not for preheating the conventional industrial burner but for heating to a higher temperature, not only does the burner endure durability, but also shortens the life of the refractory and consequently shortens the life of the burner. It will be.

In addition, the conventional industrial burner has a disadvantage that it is difficult to provide a fireball exterior member made of iron, which is vulnerable to high temperature, because the ambient temperature of the fireball made of refractory is several hundred ℃.

In addition, a conventional industrial burner has a minimum capacity of 1/7 to 1/8 relative to a maximum capacity, and its burner combustion control range is very narrow, and lifting is carried out in a flame state at a minimum flame state (1 to 20,000 kPa). There is a disadvantage that the phenomenon often occurs.

Therefore, the object of the present invention is to install the internal air bulkhead and the air-cooled crater baffle and the outer shell member to allow excess air injection to increase the burner capacity and burner combustion control range compared to the same burner specification, It is to provide an air-cooled industrial burner that can increase durability.

Figure 1a is a cross-sectional view for explaining the configuration of the industrial burner according to the present invention,

Figure 1b is a plan view for explaining the crater of the industrial burner shown in Figure 1a,

2 is a front view for explaining the configuration of an air-cooled industrial burner according to an embodiment of the present invention,

3 is a plan view of the air-cooled industrial burner shown in FIG.

4 is a left side view of the air-cooled industrial burner shown in FIG.

5 is an internal cross-sectional view of the air-cooled industrial burner shown in FIG.

6 is a longitudinal cross-sectional view taken along line A-A 'of the air-cooled industrial burner shown in FIG.

<Description of the symbols for the main parts of the drawings>

100: burner housing 101: housing flange

110: air injection pipe 120: fuel supply pipe

121: nozzle tip 130: ignition device

131: flame detection device 140: internal air partition

200: crater assembly 201: crater flange

220: crater baffle 221, 222: baffle support

223: circumferential through hole 224: support gap

230: crater exterior member 232: air cooling space

240: flame plate

An object of the present invention as described above is an air-cooled industrial burner equipped with an ignition device and a flame detection device in a burner housing in which an air inlet pipe and a fuel supply pipe are supplied with air and fuel, in a housing flange of the burner housing. An air-cooled crater exterior member coupled to the crater flange; At the inside of the crater exterior member, a disk shaped disk is joined to the nozzle tip of the fuel supply pipe at one rim, at least one circumferential through hole is formed at the circumferential surface, and at least one or more radially extending respectively. A crater assembly having a crater baffle in which the baffle support is bent vertically at each of the opposite edges to contact the inner surface of the crater exterior member; It is achieved by an air-cooled industrial burner characterized in that the air is sprayed radially, and the radially sprayed air passes through an air cooling space formed between the fireball exterior member and the fireball baffle.

Further, according to the present invention, it is preferable that the burner housing and the crater assembly have an internal space capable of maintaining an excess air ratio of up to 12000%.

Further, according to the present invention, the burner housing and the crater assembly are formed of iron, and it is preferable to stabilize the thermal stress generated by the flame by air passing through the air cooling space.

In addition, according to the present invention, it is preferable that the inner air partition has a plurality of holes penetrated therethrough.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In the drawings, Figure 2 is a front view for explaining the configuration of the air-cooled industrial burner according to an embodiment of the present invention, Figure 3 is a plan view of the air-cooled industrial burner shown in Figure 2, Figure 4 is Left side view of an air cooled industrial burner shown in FIG. 5 is an internal cross-sectional view of the air-cooled industrial burner shown in FIG. 2, and FIG. 6 is a longitudinal cross-sectional view taken along line A-A 'of the air-cooled industrial burner shown in FIG.

As shown in Figures 2 to 4, although the present invention is an industrial burner comparable to the capacity mentioned in the prior art, iron crater assembly by pulling up the excess air ratio from the conventional 500% up to about 12000% A burner device that protects the 200 from thermal stress and exhibits the ability to heat the furnace temperature to 1200 ° C or higher.

To this end, the present invention provides a burner housing 100 having a relatively large internal space and a crater assembly 200 that is an air-cooled crater.

The burner housing 100 has a cylindrical body formed of iron material, the left side of which is sealed using the circular side plate 102 and the bolt coupling member, and the opposite side thereof is used by the housing flange 101 to burn the fireball assembly ( It is coupled with the crater flange 201 of 200.

The cylindrical body of the burner housing 100 is piped through the air inlet pipe 110 with a flange 111, the '' 'with a flange 122 at the center of the circular side plate 102 on the left side Shaped fuel supply pipe 120 is coupled to extend to the axis of the crater assembly 200.

An ignition device 130 and a flame detection device 131 are mounted on the circular side plate 102 around the fuel supply pipe 120. Here, the spark plug 132 formed at the end of the ignition device 130 is coupled near the nozzle tip 121 at the end of the fuel supply pipe 120 disposed inside the crater assembly 200, the fuel supply pipe 120 It serves to ignite various industrial burner fuels (LPG, LNG, COG, OIL) supplied from the outside. In addition, the flame detection device 131 has a flame scanner sensor (133: flame scanner sensor) using any one of the salt current method, CDS method, infrared method, laser sensor at its end.

The disc-shaped inner air partition 140 is fixed to the fuel supply pipe 120 at the position close to the housing flange 101 in the burner housing 100. Here, the diameter of the inner air partition wall 140 is smaller than the inner diameter of the burner housing 100, and partially restricts the flow of air so that the air can radially flow along the edge of the inner air partition wall 140. It plays a role. In addition, a plurality of holes for controlling air flow may be formed in the internal air partition wall 140 as needed.

The crater assembly 200 includes an air cooled crater baffle 220 and an air cooled crater exterior member 230 formed of iron material.

The crater exterior member 230 is a large-diameter hollow pipe shape made of iron, which is weak in thermal stress due to the characteristics of the material, but in the present invention, the internal air partition wall 140 is used to supply excess air injected into the burner housing 100. Heat to the crater baffle 220 and the crater exterior member 230 by supercharging the air cooling space 232 formed between the crater baffle 220 and the crater exterior member 230. Stabilize the stress.

5 and 6, the outer surface of the crater baffle 220 in the crater assembly 200 maintains a predetermined distance from the inner surface of the crater exterior member 230 so as to have the aforementioned air cooling space 232. Will form.

To this end, the crater baffle 220 forms a disc shaped disk 240 at one end edge thereof. The nozzle plate 121 at the end of the fuel supply pipe 120 is inserted into the flame plate 240, and gradually moves along the radial direction to supply smooth air to the fire ignited around the nozzle tip 121. A plurality of air holes 241 and 242 having a large diameter are formed. In the industrial burner, performance characteristics vary according to the number, formation, and arrangement of air holes 241 and 242 formed in the flame plate 240, and the shape and length of the flame vary.

In addition, a plurality of circumferential through-holes 223 are formed in the circumferential surface of the crater baffle 220 to stabilize the thermal stress and to perform an inflammation function.

In addition, the crater baffle 220 has at least one baffle support 221, 222 each extending in the shape of a sunflower or radially formed by bending perpendicularly to the opposite end edge thereof, respectively, of each baffle support 221, 222. Between them, support voids 224 are formed that are equal in width to the baffle supports 221, 222.

Excess air inside the burner housing 100 charged to the air cooling space 232 passes through the support cavity 224, and then is discharged to the outside along the inner surface of the crater exterior member 230, thereby causing the crater baffle 220. The crater exterior member 230 is cooled.

Thus, the characteristic feature of the present invention is that the burner housing 100 is equipped with a crater assembly 200 composed of an air-cooled crater exterior member 230 and an air-cooled crater baffle 220. In addition, another characteristic feature of the present invention is that the burner housing 100 forms a relatively large inner space so that the burner assembly 200 can maintain an excess air ratio of up to 12000% and the inner air partition 140 therein. ) Is installed.

In the following, it will be described the operation relationship of the air-cooled industrial burner of the present invention as described in detail above.

External air supply means (not shown) is piped with the air inlet pipe 110 through a flange coupling, external fuel supply means (not shown) is piped with the fuel supply pipe 120 by a conventional piping method, external power supply The means (not shown) is coupled to the input end of the ignition device 130 by an electrical coupling method.

According to a conventional industrial burner ignition sequence, ignition power is supplied through an input terminal of the ignition device 130, and an ignition flame is generated between the ignition plug 132 and the nozzle tip 121 of the ignition device 130. do. On the other hand, the fuel supplied from the external fuel supply means is delivered to the nozzle tip 121 through the fuel supply pipe 120, is injected from the nozzle hole of the nozzle tip 121, the crater baffle 220 by the ignition flame Fires inside).

Thereafter, the air supplied from the external air supply means is supercharged into the burner housing 100 through the air injection pipe 110 and flows to the open fireball assembly 200. At this time, the flowing air hits the disk-shaped inner air partition 140 and flows radially along the rim so that it is not directly supplied to the crater assembly 200. That is, the external air partition 140 prevents the air inside the burner housing 100 from being directly supplied to the flame plate 240 of the crater assembly 200 when air is charged, and at the same time, the air flows radially as the air flows. To supercharge the crater exterior member cooling air cooling space 232 at the same time.

As such, when the air is supplied, the flame ignited in the crater baffle 220 is more intense and emits strong heat.

Of course, when more and more air and fuel is supplied in excess, the thermal stress that weakens the fireball assembly 200 is increased while generating more flame and heat.

However, in the present invention, the excess air flows further over the internal air partition 140 to correspond to an increase amount of the excess air supplied into the burner housing 100.

Since the excess air primarily collides with the internal air partition wall 140, while the flame shape change or the load change rate is relatively small, the excess air is linearly radially introduced into the air cooling space 232 for cooling the fireball exterior member.

This excess air is first introduced into the crater baffle 220 through the circumferential through hole 223 of the crater baffle 220 to cool the crater baffle 220 primarily, and is formed by the baffle supports 221 and 222. Cooling the fireball baffle 220 secondaryly through the support voids 224.

In addition, the excess air exiting the fireball baffle 220 cools the air-cooling fireball exterior member 230 while exiting to the outside like a flame through the inner surface of the air-cooling fireball exterior member 230.

In the present invention, since the crater assembly 200 is cooled by the excess air, the thermal stress applied to the crater assembly 200 can be relatively reduced, and the fuel and air supply can be relatively increased. Excellent performance in its class.

In addition, in the air-cooled industrial burner of the present invention, even if the amount of fuel and air (gas) are adjusted to a minimum, such as 10,000 to 20,000 kW, the lifting phenomenon occurs by the internal air partition 140. At the same time, the flame will not be lost.

In addition, the air-cooled industrial burner of the present invention exhibits stable operating performance even when the maximum capacity of burner combustion is adjusted to about 20 to 30 when the minimum capacity of burner combustion is set to 1 by the internal air partition wall 140.

As described above, the air-cooled industrial burner according to the present invention has an air-cooled chemical structure assembly, which has about twice the performance improvement compared to the same class, and since the material of the fireball assembly is made of iron, it is compared with the burner using refractory materials. The relatively light weight has the advantage of easy installation and maintenance.

In addition, the air-cooled industrial burner of the present invention has a burner housing having a relatively large capacity compared to that of the same class, and performs excessive supply of air, so that the amount of fuel used is relatively low, and the furnace is capable of heating the furnace temperature to 1200 ° C or more. Has performance.

In addition, the air-cooled industrial burner of the present invention has the advantage of having a relatively long product life, very strong against mechanical shock during installation and maintenance, and excellent durability against thermal stress because there is little use of refractory.

In addition, the air-cooled industrial burner of the present invention has a minimum capacity of 1/20 to 1/30 of its maximum capacity, and its burner combustion control range is very wide, and sparks do not burn even in a minimum flame state (1 to 20,000 kPa). There is no advantage.

The technical idea of the air-cooled industrial burner of the present invention has been described together with the accompanying drawings, but this is illustrative of the best embodiment of the present invention and is not intended to limit the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (4)

In the air-cooled industrial burner equipped with the ignition device 130 and the flame detection device 131 in the burner housing 100 in which the air injection pipe 110 and the fuel supply pipe 120 are supplied with air and fuel, An air-cooling crater exterior member 230 coupled to the housing flange 101 of the burner housing 100 by a crater flange 201; In the inside of the crater exterior member 230, a disk-shaped flame plate 240 coupled to the nozzle tip 121 of the fuel supply pipe 120 is formed at one edge thereof, and at least one circumferential through hole 223 is formed. Crater baffles 220 formed to penetrate the circumferential surface and bent at least one or more baffle supports 221 and 222 extending radially from each other at the opposite edges to contact the inner surface of the crater exterior member 230. Including a crater assembly 200 having, The internal air partition wall 140 is installed inside the burner housing 100 to radially inject excess air that is supercharged into the burner housing 100, and the air injected radially is the crater exterior member ( Air cooling type industrial burner, characterized in that passing through the air cooling space 232 formed between the 230 and the crater baffle (220). The method of claim 1, The burner housing (100) and the crater assembly (200) have an internal space capable of maintaining an excess air ratio of up to 12000%. The method of claim 1, The burner housing 100 and the crater assembly 200 are formed of iron, and the air cooling type is characterized in that the thermal stress generated by the flame is stabilized by the air passing through the air cooling space 232. Industrial burners. The method of claim 1, The internal air partition wall 140 is an air-cooled industrial burner, characterized in that it has a plurality of holes through the through.