KR0116412Y1 - Dust removing device of sintering machine main air pipe - Google Patents

Abstract

The present invention automatically removes the dust loaded on the main exhaust pipe with air pressure, thereby eliminating the difficulty of removing dust by eliminating dust removal by manpower, and automatically removing dust without stopping the production line. A plurality of dust removal means is provided in the main exhaust pipe wall portion to a position interposed between the double damper hopper to provide the main exhaust pipe of the steelmaking sintering machine to be removed to increase the productivity.

Description

Dust removal device of sintering machine main air pipe

1 is a cross-sectional view showing a main air pipe of a conventional steel sintering machine,

2 is a cross-sectional view taken along line X-X of FIG.

3 is a cross-sectional view showing a main air pipe of the steelmaking sintering machine according to the present invention,

4 is a cross-sectional view of the Y-Y section of FIG.

5 is an enlarged view showing A of FIG.

* Explanation of symbols for the main parts of the drawings

[Industrial use]

The present invention relates to a dust removal device of the main sintering pipe, in particular, the main exhaust pipe does not fall naturally to the double damper hopper installed below the main air duct in the steel sintering machine main air in the sub-atmospheric pressure The present invention relates to a dust removal device of a main exhaust pipe of a sintering machine capable of transporting and removing dust accumulated on an inner wall of a lower portion of the air into a double damper hopper under normal operation by injecting air from the atmosphere and spraying it through an injection hole.

[Private Technology]

In general, the sintering operation charges the sintered compound raw material at a constant height on a great bar spaced 5 mm apart so as to allow ventilation on the sintered truck, and sintered ore by advancing the sintered compound raw material while absorbing air from the lower main exhaust pipe. To manufacture.

At this time, in order to smoothly suck air into the sinter bogie, as shown in FIGS. 1 and 2, the high speed air flows through the main exhaust pipe 2, so that a lower pressure than the atmosphere is introduced into the main exhaust pipe. As it is formed, air is sucked from the upper atmosphere to the sinter bogie.

In addition, a wind box (wind box) 4 is installed on the upper part of the main exhaust pipe 2, and a double damper hopper that collects dust that has escaped between the great bars when the air is sucked in the lower part of the main exhaust pipe ( 6) is installed.

Here, the double damper hopper (6) in the large sintering machine is installed 10-15 pieces at intervals of about 2m in the main air pipe (2), some of the dust falling naturally from the main air pipe falls into the double damper hopper, Some will accumulate on the inner wall of the main exhaust pipe located between the double damper hoppers.

The accumulated dust causes resistance to the air flow in the main exhaust pipe (2), resulting in a decrease in the air intake capacity toward the light distribution side, thereby reducing the amount of suction pool of each wind box (4) installed on the main exhaust pipe. , Incomplete combustion in the sintered blended material lowers the temperature of the sintered layer, and as a result, the sintering productivity and the rate of recovery of the sintering decrease, which increases the anti-pores. It causes.

When the dust accumulated on the inner wall of the main exhaust pipe (2) is more than 1/2 of the diameter of the main exhaust pipe, the sintering process becomes difficult. Therefore, the operation of the plant is stopped and the dust accumulated on the inner wall of the main exhaust pipe is removed while the operation is stopped. The plant must be restarted afterwards.

Summary of the proposal

The present invention does not naturally fall into the double damper hopper installed at the lower part of the main air duct in the steel sintering machine main air duct with sub-atmospheric pressure. It is an object of the present invention to provide a dust removal apparatus of a sintering main exhaust pipe which can be transported and removed by a double damper hopper under normal operation by spraying through three days.

In order to achieve the above object, the present invention has the air supply pipe at the lower end of the main exhaust pipe through which the fluid passes to the right so as to be located at each left side between the double damper hoppers, Provided is a dust removing apparatus of a sintering machine main exhaust pipe, characterized in that a plurality of injection passages for injecting air in the right direction at one side of the air supply pipe is formed.

The configuration of the present invention will be described with reference to the drawings.

The main exhaust pipe 2 in the sintering machine has an inner diameter of about 5 m, and the suction air volume of the blower is 18000 Nm 3 / sec. Thus, the internal pressure formed inside is at a reduced pressure (1500-2000 mmAq) below atmospheric pressure.

When the fluid flows from the left side to the right side, the main vent pipe 2 refers to the light distribution portion, the central portion, and the right portion of the left portion.

At this time, the air pipe 10 penetrates horizontally in the direction perpendicular to the axial direction of the main exhaust pipe at the lower end of the main exhaust pipe so that the left side of the lower end of the main exhaust pipe 2 positioned between the double damper hoppers 6 is biased. It is.

Here, the air pipe 10 has a structure in which the one end surface embedded in the main exhaust pipe 2 is sealed while the other end surface external to the main exhaust pipe is opened.

In particular, the air pipe 10 is formed with a plurality of injection holes 12 on the right side of the outer peripheral surface built in the main exhaust pipe (2), the injection hole 12 is air in the same direction as the fluid flow of the main exhaust pipe It is formed horizontally to spray the.

Therefore, the internal pressure below atmospheric pressure is formed in the air pipe 10 by the pressure in the main exhaust pipe 2, whereby the air is sucked into the air pipe and is injected through the injection hole 12.

EXAMPLE

The size of particles accumulated in the main exhaust pipe when the main exhaust pipe (2) of the sintering machine has an average pressure of 0.85 atm, a temperature of 383 ° K, a density of 0.75 kg / m3 and a viscosity of 0.00002005 kg / m.sec. The particle velocity according to the particle velocity (the fluid velocity that can be scattered by a single particle) is calculated as shown in Table 1 below.

Also, the particle size of the dust accumulated in the main exhaust pipe varies depending on the position of the main exhaust pipe.

The state of the sintering machine is about 1mm, the middle part is 2-3mm, and the light distribution part is about 4-5mm.

Has a particle size of.

Therefore, when the particle end speed is shown in Table 1, the flow rate is approximately 13 m / sec, the central part is 20 m / sce, and the light distribution part has to maintain the flow rate to the double damper hopper at the site where the dust naturally falls. Can be transferred.

In the air pipe 10 having a diameter of 80 mm used in the present invention, a plurality of injection holes 12 are formed to inject air to the light emitting part side of the main exhaust pipe 2.

At this time, the matters to be taken into consideration when determining the diameter of the injection hole 12 should be large, so as not to be closed due to the falling dust, and second, by the high velocity air through which the diameter of the injection hole passes. Consideration should be given to the possibility of expansion.

Therefore, the diameter of the injection hole 12 of the air pipe 10 is processed to 5 mm on the light feeding part side, 8 mm on the middle side, and 10 mm on the light distribution part side.

At this time, the relationship between the diameter of the injection hole 12 and its discharge flow rate and the number of injection holes is shown in Table 2 below.

If the air pipe 10 is a diameter of 60 mm or less or a pipe of 100 mm or more without using an 80 mm diameter pipe, the ratio of the cross-sectional area of the injection hole 12 is as shown in Table 3 below. The reason why the diameter of 80mm is used will be described.

First, in the air pipe 10 near the light emitting part which forms a large number of injection holes 12 having a diameter of 5 mm, in consideration of the difficulty of work and durability of the pipe, the gap between the injection holes is about 5 mm, and 1600 injection holes are drilled. In the length of air pipe, about 6 lines should be drilled about 250 per line.

In this case, since the required diameter of the air pipe 10 is at least 65 mm, the minimum diameter of the air inlet pipe is more than 80 mm, and in this case, the cross sectional area ratio of the injection hole 12 is 5.08%.

Therefore, air inlet pipes with a cross sectional area ratio of 5.08% or less should be used.

In this case, all the pipes of 80 mm or more, including a part of the diameter of 60 mm and a part of the diameter of 40 mm in Table 3, will be the diameter applied to the present invention.

However, the cantilever supply pipe 10 having a diameter of 60 mm or less is inappropriate to be used in consideration of the problem of removing foreign matters inside the pipe, durability problems, etc., and a pipe having a diameter of 100 mm or more may extend the diameter of the air inlet pipe more than necessary. In addition, due to the capacity of the suction blower of the main exhaust pipe (2), there is a possibility that much more air is sucked than the suction air flow rate when the diameter is 80mm, which will adversely affect the sintering machine.

Therefore, the diameter of the air inlet pipe is suitable for the sintering machine of the present invention is 80mm.

The present invention is a method of sucking air from the outside through the air pipe 10 in the main exhaust pipe (2) in a reduced pressure state, the leakage occurs in the main exhaust pipe as much as the amount of air sucked through the air pipe, Calculation shows that the capacity of the main blower pipe suction blower is 1800 Nm. / sec, the flow rate of air leaked is 3.765m when the flow rate of air through the air pipe is 80mm, the number of air pipes is up to 15, and the air flow rate is 50m / sec. / sec.

Therefore the leak rate is It is enough.

Therefore, the leak rate of 0.02% is unlikely to adversely affect the sintering operation.

As described above, the present invention is easy to install because the pipe of simple structure is installed in the main exhaust pipe, and since the dust can be removed continuously, it causes the production interruption and operation interruption cases due to the accumulation of dust in the main exhaust pipe. The industrial effect is great because it enables the sintering operation without making it work.

Claims (1)

Air supply pipes 10 are built in through the lower side of the main exhaust pipe 2 through which fluid flows to the right, respectively, on the left side between the double damper hoppers 6, and the main exhaust pipes 2 are built-in. The dust removal apparatus of the sintering machine main exhaust pipe, characterized in that a plurality of injection holes 12 for injecting air in the right direction at one side of the air supply pipe 10 is formed.