JPS6219675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition device for a sintering machine, and in particular to a device that is effective in saving fuel and downsizing the device by employing a strip-shaped flame burner that creates a continuous flame in the width direction of the pallet. suggest.

Description of the Prior Art Generally, the ignition device of a sintering machine fires a gas such as heavy oil, coke oven gas, or a mixture of coke oven gas and blast furnace gas to the upper surface of the sintering raw material layer charged and deposited on a pallet. It is used to burn the coke in the sintering raw material by the combustion of the burner using the sintering material, in cooperation with the combustion flame and high-temperature hot air obtained at the time.

FIG. 1 shows a sintering machine in which the igniter of the present invention is installed. In the figure, 1 is a pallet, 2 is a wind box, and 8 is an igniter, which mainly consists of an ignition furnace 3a and a burner 3b. 4 is a bedding hopper, and 5 is a raw material hopper.

Figure 2 shows a typical sintering machine ignition system that has been used in the past, and consists of a group of burners 3b, each consisting of a set of burners arranged in multiple rows in the direction of pallet movement. It has been done.

Such conventional ignition devices have the drawbacks of uneven burning and poor fuel consumption. Third
The figure shows the distribution of ignition strength in the width direction of the pallet when a conventional ignition system is used. There is a clear difference in ignition strength between directly below the burner, which shows each peak value, and at an intermediate position between them. It causes unevenness. In such a case, it is generally necessary to adjust the combustion rate of the burner 3b based on the weakest ignition strength to prevent uneven burning, which results in increased energy usage. Moreover, since the ignition strength of each burner is different, it is almost difficult to obtain a uniform ignition strength distribution in the width direction of the pallet.

In addition, in the conventional ignition device, an ignition furnace 3a is used to preheat the sintering raw material or to retain heat after ignition.
The furnace capacity was increased and hot air was blown into the sintered raw material before and after the ignition point, but this method has not been effective in improving quality or reducing fuel consumption and is on the verge of being phased out. Furthermore, since the conventional ignition furnace 3a has a high furnace height of 1500 mm on average, the distance from the burner tip to the surface of the sintered raw material layer tends to be long, which tends to promote energy loss. Combined with natural dissipation, the energy loss becomes even greater.

In response to this, an ignition device having a single mixing combustion chamber and a slit-shaped combustion gas discharge port was recently proposed as disclosed in Japanese Patent Application Laid-Open No. 57-37685. This device had the following drawbacks because what was blown out from the slit-shaped outlet was not a flame but a type of high-temperature exhaust gas.

(1) Since the mixing chamber becomes red-hot, the burner chip that serves as the combustion gas discharge port is easily deformed, making it difficult to obtain a stable frame, making it difficult to ignite uniformly in the width direction of the pallet.

(2) In order to prevent the slit-shaped burner chips from deforming, special materials are required, and the structure becomes complicated, resulting in high equipment costs.

(3) It is difficult to achieve complete combustion in the above mixing chamber;
Unburned gas is likely to be discharged and cause ignition failure.

(4) Furthermore, like the existing equipment, the ignition furnace is large, so energy loss cannot be avoided, and the furnace structure is quite complex, requiring a structure with high support strength, which increases equipment costs.

OBJECT AND SUMMARY OF THE INVENTION An object of the present invention is to overcome the drawbacks of the above-mentioned ignition furnace and conventional ignition device having a slit-shaped combustion gas discharge port, thereby achieving downsizing of equipment and simplification of repair. The object of the present invention is to provide a device that is advantageous in reducing equipment costs and conserving energy. To this end, the present invention provides a pallet in which the air passages are located on both sides of the fuel gas passages sandwiching the fuel gas passages from the fuel gas pipes and combustion air pipes arranged across the pallet width direction of the sintering machine. The burner main body has a band-shaped burner passage extending in the width direction, and a gas nozzle passage is provided in the center corresponding to each of the burner passages, and nozzle holes are provided on both sides of the gas nozzle passage in such a manner that their jet directions intersect with each other. A sintering method characterized in that a large number of long burner chips arranged in a longitudinal direction are removably attached, and a small burner hood is provided to cover only the combustion atmosphere below the burner chips. The company adopted the aircraft's ignition system as a means of solving this problem.

Explanation of structure and operation of the invention Figure 4 and the following show one preferred example of the ignition device of the present invention, in which numeral 6 is a fuel gas pipe, 7 is a combustion air pipe, and 8 is a fuel gas supply pipe. , 9 are air supply pipes, each of which has its axial direction extending in the width direction of the pallet, and short pipes 10, 11 at multiple locations in the axial direction.
The gas pipe 6 and the gas supply pipe 8 and the air pipe 7 and the air supply pipe 9 are individually communicated via the fuel gas pipe 6 and the air pipe 7, and the fuel gas pipe 6 and the air pipe 7
It is constructed of heavy pipes, and coke oven gas and the like flow through the fuel gas supply pipe 8 constituting the central flow path 8a, while air flows through the air pipe 9 constituting the annular flow path 9a.

In the central flow path 8a of the fuel gas pipe and the annular flow path 9a of the air pipe, rectifying plates 18 and 14 are provided with a large number of through holes 12 that can be inserted and removed.
It serves to provide even gas flow distribution in the axial direction of the tube.

From the fuel gas pipe 6 and the combustion air pipe 7, there is a slit-shaped fuel gas burner passage 15 extending in the width direction of the pallet, and an air burner passage 1.
6 and 16' protrude in the radial direction, and flanges 17 and 17' are protruded from their tips, and this structure forms the burner body B _b .

For the burner body, a fuel gas burner passage 15 and an air burner passage 16, 16' are provided.
A gas nozzle passage 18 and an air nozzle passage 19, 19' corresponding to the above are provided, and nozzle holes 20, 20', 21, 21' are opened at the tip of each passage, while flanges 22, 22' are provided at the upper end thereof. A burner tip B _t is detachably attached via a bolt 23 .

The fuel gas nozzle holes 20, 20' in the burner chip _Bt are open in directions facing both outsides, and the air nozzle holes 21,
21', on the other hand, is opened inward, and the injection directions of both are formed to intersect with each other. Moreover, each nozzle hole 20, 20',
The structure shown in FIGS. 5 and 6 is such that a large number of combinations of tubes 21 and 21' are arranged in rows at intervals of approximately 10 to 20 mm in the tube axis direction over the width direction of the pallet.

The nozzle holes 20, 20', 2 of the present invention described above
When the arrangement and combination of 1 and 21' (injection directions are made to intersect) is adopted, compared to conventional burners, the fuel gas and air are injected more preferably at right angles to each other than through small diameter holes. The flame becomes a short flame. For this reason, the upper surface of the sintered raw material layer on the pallet and the burner tip B _t can be brought close to each other.

As a result of this, the burner hood according to the present invention can have the following structure.

That is, since the burner hood 24 can be made smaller not only in the height direction but also in its entirety, energy loss is reduced and construction costs are reduced due to equipment downsizing.

Furthermore, the effect of making the burner hood 24 smaller produces the following synergistic effect in conjunction with the use of the removable burner tip _Bt . That is, if the burner tip _Bt of the present invention is adopted, ignition can be performed uniformly in the width direction of the pallet and is advantageous from a thermoeconomic standpoint.
You only need to cover _{the t} part. However, this problem, which is a phenomenon often observed in conventional burners, has the disadvantage that the burner chip B _t is easily overheated and thermally deformed. In order to avoid this, it is desirable to be able to easily replace only the burner tip _Bt , and in order to meet this requirement, the present invention has made the tip removable from the burner body. Furthermore, in order to facilitate replacement, a burner hood is provided below the removable part of the burner chip to protect the removable part from high heat and prevent thermal deformation of the removable part.

Explanation of Effects of the Invention As described above, according to the present invention, the burner flame becomes a short flame band that is uniform in the width direction of the pallet, so the ignition strength is made uniform, the hood is made smaller, and energy loss is significantly reduced. Improve. For example, according to experiments conducted by the present inventors, the conventional fuel unit was
The one that was 15000kcal/t-sinter,
9000Kcal/t-sinter (sinter production 5000t/
D, 3.9Nm ³ /t, A/G = 2.2, mixed gas calorie = 2300Kcal/Nm ³ ).

Further, according to the present invention, since the burner tip can be easily replaced (by using heat-resistant steel or the like), the service life can be extended. In addition, construction and maintenance costs can be saved because the entire equipment can be downsized and parts can be replaced.

Furthermore, since uniform ignition can be achieved in the width direction of the pallet (see FIG. 6), uneven burning can be eliminated, and the yield of sintered products can be significantly improved.

In addition, another effect of using the burner chip of the present invention is that by increasing the diameter of the nozzle hole in the side wall of the sintering machine to correspond to the large ventilation area, it is possible to adjust the nozzle hole diameter appropriately according to the air volume distribution. It is in a position where it can provide ignition strength.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a sintering machine, Fig. 2 is a sectional view of a conventional ignition device, Fig. 3 is a distribution graph of ignition strength in the pallet width direction by the conventional ignition device, and Fig. 4 is a graph of the present invention. 5 is a partially cutaway bottom view of the igniter of the present invention; FIG. 6 is an enlarged bottom view of the nozzle hole of the burner tip; FIG.
The figure shows a front view of the sintering machine pallet and igniter,
The figure shows a distribution graph of the ignition strength in the pallet width direction by the ignition device of the present invention. B _b ... Burner body, F... Frame, B _t ...
... Burner chip, 1 ... Pallet, 2 ... Wind box, 3 ... Ignition device, 4, 5 ... Hopper, 6 ... Fuel gas pipe, 7 ... Combustion air pipe,
8...Fuel gas supply pipe, 9...Air supply pipe, 1
0,11...Short pipe, 12...Through hole, 13,14...
...straightening plate, 15...burner passage for fuel gas, 1
6, 16'...Air burner passage, 17, 17'...
...Flange, 18...Gas nozzle passage, 19,1
9'...Air nozzle passage, 20, 20', 21, 2
1'... Nozzle hole, 22, 22'... Flange, 2
3...Bolt, 24...Burner hood.

Claims (1)

[Scope of Claims] 1. From the fuel gas pipes and combustion air pipes arranged across the pallet width direction of the sintering machine, the pallet width direction is such that air passages are located on both sides of the fuel gas passage. The burner body has a protruding band-shaped burner passage extending in the direction of the burner, and a gas nozzle passage is provided in the center corresponding to each of the burner passages, and nozzle holes are opened on both sides of the gas nozzle passage so that their jet directions intersect with each other in the longitudinal direction. A sintering machine characterized in that a large number of long burner chips arranged in rows along a sintering machine are removably attached, and a small burner hood is provided to cover only the combustion atmosphere below the burner chips. Ignition device.