Ceramic gas burner and a heat regenerator provided with this burner

 

Ceramic gas burner is designed for use in the combustion chamber of the regenerator heat, such as the blast furnace. Ceramic burner is supplied with the first supply channel for the first component of the fuel, such as fuel gas, and a second flow channel for the second fuel component, such as combustion air, and the first supply channel communicates with essentially elongated outlet and the second flow channel is communicated at least one second outlet hole and the last hole(I) is essentially parallel to the first exhaust hole and the lower stream, partition, which lasts up to two outlet openings, and these outlet openings communicate directly with the combustion chamber, in addition, the partition is located between the first feed and the second feed channel, and in which at least one of the first and second input channels equipped with a means for creating turbulence component of fuel during operation, while he goes through the channel(s) in question, and that the turbulence is such that a combustible mixture of two components is formed upstream of the end of p is, the which is located near the outlet(s), at least the first and/or second supply channel, in cross-section of the channel in question, the degree of expansion provided by the shape of the septum and continues until the end of the partition by means of gradual expansion, resulting in the turbulence chamber. The invention allows for the burning is actually a permanent, preferably very close to the outlets. 2 S. and 1 C.p. f-crystals, 3 ill.

The invention relates to a ceramic gas burner, in particular for use in the combustion chamber of the regenerator heat, such as the blast furnace, and a ceramic burner is supplied with the first supply channel of the first component of the fuel, such as fuel gas, and a second supply channel of the second fuel component, such as combustion air, and the first supply channel communicates with essentially elongated outlet opening, and a second feed channel reported at least one second outlet opening, the latter opening(s) runs essentially parallel to the first exhaust hole and the lower flow, wall, kotori combustion, and, in addition, the partition wall is located between the first feed and the second feed channel. The invention also relates to a heat regenerator provided with a ceramic burner of this type.

When the blast furnace many stoves are grouped together near the blast furnace, resulting in switching from one heater to another is always possible to submit into the blast furnace through the outlet of the heated air heater hot air as a component of the reaction. When the heater is disconnected from the blast furnace, it can be re-heated gaseous product of combustion with ceramic burner, resulting hot exhaust gas passes through the combustion chamber and the heat retention shaft, and the heat retention shaft absorbs the heat of the hot exhaust gas, so that this heat can then be transferred again on the subsequent stage air, which is supplied to the heater through the inlet.

For efficiency, the installation is very important that the components of the fuel supplied to the ceramic burner burned as fully as possible before the hot exhaust gas passes through the shaft of the preserve is Rilke known type known design, have one channel of the fuel gas supply and one channel for feeding air for combustion. Also known structure in which one channel for fuel gas is located centrally between the two input channels of the combustion air.

Also known construction, in which the outlet channel for feeding air for combustion contains the same hole at the same time it is also known that the separation of the holes on the number of individual openings. The last design is described, for example, in European patent EP 0090096.

Although known designs to improve combustion efficiency that must be achieved, it was found that, nevertheless, it is possible to further improvement. In particular, it was found that it is very important to keep all the time the ignition of the flame as close as possible above the burner. This is because, if ignition occurs at a higher elevation due to the slow mixing of the fuel components, it becomes possible significant fluctuations of the place of burning, leading to a ripple of flame that can cause vibration of the unit itself.

Therefore, the object of the invention is to provide distinctive characteristics, thanks to the m

The solution that was found at the present time, can be used in structures with one and two input channels of the second fuel component, and in the constructions in which the outlet of each supply channel is a single hole or split into separate holes.

The invention consists in that at least one of the first and second input channels equipped with a means for creating turbulence component of fuel during operation, while he goes through the channel(s) in question, and that the turbulence is such that a combustible mixture of two components is formed upstream of the end walls and near him. It was found that turbulence can be created in a simple way, if the tool contains the expansion stage, which is located near the outlet(s), at least one and/or the second flow channel cross-section of the channel in question, the degree of expansion provided by the shape of the septum and continues until the end of the partition by means of gradual expansion, resulting in the turbulence chamber. On the site of a dramatic expansion of the turbulence created by Arburthnot also passed to another component of the fuel, resulting in a turbulent fuel-air mixture. This combustible mixture can be ignited directly in the same location due to the fact that the turbulence of the flow velocity in the longitudinal direction of the combustion chamber is low. In the result, the flame formed cannot easily be "deflated" in the direction from the burner head.

Of course, the sudden expansion should be wide enough to create sufficient turbulence. It was found that good results are achieved if the magnitude of the expansion stage is from 20 to 35% of the original cross section of the channel in question.

It was found that the success of a new design contribute not only to the size of the expansion stage, but also that the best results are achieved if the expansion stage continues until the end of the partition by means of gradual expansion, resulting in the turbulence chamber. With the gradual expansion chamber formed by the turbulence reaches a sufficient volume to create more turbulence of the gas and, consequently, to mix it into a combustible mixture. This further ensures the stability of obreros for fuel gas and combustion air, which is located upstream of the combustion chamber and separated from it by a narrow channel cross-section. In the mixing chamber, the combustion mixture is prevented by this channel with a narrow cross section. As in the ceramic burner according to the present invention, the outlet openings for gas and air are communicated directly with the combustion chamber and means for creating turbulence forms a combustible mixture upstream of the end walls and near it, the ignition of the combustible mixture begins at the specified funds.

In EP 0090096 describes a ceramic burner, in which the outlet openings for the gas and air are of the form, to create turbulence from these outlets to the combustion chamber. No separate device, such as expansion stage to create a turbulent mixture of gas and air upstream of the openings and adjacent the end walls, are not described. In the US 3837793 were described ceramic burners of the prior art, in comparison with which the present invention is an improvement.

Except as described ceramic burner the invention also relates to a heat regenerator, such as the blast furnace, which is equipped with the Aza, containing the combustion chamber and the heat retention shaft, a combustion chamber provided with a ceramic gas burner to heat the heat regenerator and the gas burner is of the type described above.

The invention will be explained in more detail below with reference to the drawings, in which: Fig. 1 depicts an example of a regenerator heat stove for a blast furnace; Fig.2 - item 11 of Fig.1 in an enlarged scale; Fig.3 is another embodiment of this details.

In Fig.1 the reference 1 indicates as a heat regenerator in the form of a hot blast stove for a blast furnace. The heater comprises a combustion chamber 2 and the heat retention shaft 3, which are separated from each other by a wall 4. Ceramic burner 5 is arranged in the lower part of the combustion chamber. The combustion air for ceramic burner is supplied through the connecting hole 6, and the fuel in the combustible gas is supplied through the communication hole 7. The mixture of combustion air and combustible gas is combusted in the combustion chamber 2. Flue gases from combustion, rise up in the combustion chamber 2, is discharged through the dome 8 and then pass through the heat storage shaft 3, which is made of refractory bricks (not shown), where istia, leave the heater through the outlet opening 9, one of which is shown.

After the refractory bricks are heated to a sufficient temperature, the supply of fuel and combustion air through the openings 6 and 7 is terminated, after which cold air is supplied through the outlet opening 9. This cold air then passes through the surface of the heat storage in the heat storage shaft 3, is heated here and then leaves the heater through the hole 10. Hole 10 is connected to a distribution system for hot air, the so-called "hot wind", with the aim of submitting it in a blast furnace.

The combustible gas which is supplied through the connection opening 7, is given up in the first feed channel 13 fuel gas, while the connecting hole 6 is connected to the second supply channel 12 of the combustion air. The input channels 12 and 13 are separated from each other by a partition 11.

The configuration around the upper end of the partition 11 is indicated by the position 11 and shown in detail in enlarged scale in Fig.2. Corresponding reference numbers in Fig.1 refer to the corresponding elements in Fig.2. In Fig.2 can be seen that the outlet 14 of the first feed channel 12 is determined, the air flow may pass through the gas stream, as a result they are mixed so as to form a combustible mixture.

The feed channel 13 is provided directly below the outlet 15, the expansion step 16, which is provided by the local constriction of the walls 11. Expansion stage 16 adjacent to the gradual extension 17 in the direction of the outlet 15. The result is the turbulence chamber 18 between the expansion step 16, the gradual extension 17 and the outlet 15. In the turbulence chamber 18 intensive turbulent motion, which takes place directly over the outlet 15, is transferred to the gas stream, which it reported to the combustion air from the channel 12. As a result, in the turbulence chamber 18 is formed a rich fuel mixture, which has a low component of velocity in the direction of the main flow through the combustion chamber 2. If this rich fuel-air mixture is lit, the flame front near the free end of the partition 11 remains very stable. The result is to prevent pulsation of the flame and, consequently, vibration phenomena of the whole structure is also prevented. Moreover, the combustion efficiency is improved.

As mentioned above, the invention is not limited to the illustrated constitutional 12bcombustion air are disposed symmetrically with respect to the supply channel 13 fuel gas. In this design, as shown in Fig.3, instead of one partition 11 has two partitions 11aand 11band there are two outlet openings 14aand the 14bfor input channels 12aand 12b.

The same positive effect is achieved if the outlet opening(s) 14 (or 14aand the 14b) combustion air is divided into separate holes.

Claims

1. Ceramic gas burner, in particular for use in the combustion chamber (2) of the regenerator heat, such as a heater (1) for a blast furnace, and a ceramic burner is supplied with the first supply channel (13) for the first fuel component, such as a combustible gas and the second flow channel (12) for the second fuel component, such as combustion air, and the first feed channel (13) is connected with essentially elongated outlet opening (15) and a second supply channel reported at least one second outlet opening (14)and the last hole(I) is essentially parallel to the first exhaust hole and the lower thread will communicate directly with the combustion chamber (2), and, in addition, the partition wall is located between the first feed channel (13) and the second flow channel (12), and in which at least one of the first and second input channels (12, 13) provided with a means for creating turbulence component of fuel during operation, while he goes through the channel(s) in question, and that the turbulence is such that a combustible mixture of two components is formed upstream of the end wall (11) and near him, moreover, the tool for creating turbulence contains the expansion step (16), which is located near the outlet(s) (14, 15), at least the first and/or second supply channel, in cross-section of the channel in question, the degree of expansion (16) is provided by the shape of the walls (11) and continues until the end of the partition (11) through the gradual expansion of (17), resulting in the turbulence chamber.

2. Ceramic burner under item 1, characterized in that the magnitude of the expansion stage (16) is from 20 to 35% of the original cross section of the channel in question.

3. The heat regenerator, such as the blast furnace, which is provided with an inlet opening (9) for filing Gaius (2) and the heat retention shaft (3), moreover, the combustion chamber (2), to heat the heat regenerator provided with a ceramic burner (5), characterized in that the ceramic burner refers to the type corresponding to one of the preceding claims.

 

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FIELD: metallurgy, namely constructions of air heaters of blast furnaces.

SUBSTANCE: apparatus includes casing with lining; adapter; roof with pre-combustion chamber coaxially arranged in its upper portion and having jacket and lining separately rested upon casing; ducts for passing air and gas are formed in lateral vertical wall of pre-combustion chamber lining and they are communicated with inner collectors and unions for supplying gas and air. Ducts of lower collector are arranged in its upper portion and they are directed upwards from horizontal plane by inclination angle 15 - 30°. Ducts of upper collector are arranged in its lower portion and they are directed downwards from horizontal plane by inclination angle 15 - 30°. Projections of axes of all ducts on horizontal plane form angle 15 - 45° relative to projections on horizontal plane of radiuses of pre-combustion chambers passing through centers of outlet cross sections of said ducts.

EFFECT: lowered operational expenses, improved quality of gas burning.

2 dwg

FIELD: ferrous metallurgy, namely designs of hot blast valves of blast furnace air heaters.

SUBSTANCE: valve includes water cooled lined lock disc, water cooled lined housing having lid, mouth portion, attached flanges and cylindrical portion inside which stop rings restricting inter-ring space for placing lock disc are arranged. At each side of inter-ring space in housing there are two annular ducts for water used for cooling stop rings and attached flanges. On lateral outer surface of housing ducts for cooling water are mounted. In lower portion of housing at each side of inter-ring space branch pipe with two openings is mounted in order to partition duct for water that cools attached flange. One opening of said branch pipe is connected with system for supplying cooling water and with duct for cooling stop ring. Second opening is connected with duct for cooling flange and with duct for cooling water on lateral outer surface of housing. On each front outer surface of mouth of housing there is duct for cooling water connected with duct on lateral outer surface of housing.

EFFECT: increased period of useful life of valve.

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FIELD: metallurgy.

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EFFECT: decreasing of consumed electricity, increasing of coefficient of efficiency of blast furnace air heaters.

3 cl, 1 dwg

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