JPS6214110Y2 - - Google Patents

Description

[Detailed description of the invention] (3.1) Industrial application field The present invention relates to a device for collecting smoke and dust generated from the furnace mouth, ladle, etc. during charging and tapping of molten steel in a converter.

(3.2) Prior art In general, large amounts of iron oxide dust or dust gas containing fine particles such as CaO are generated during molten steel charging and tapping operations in a converter, which deteriorates the indoor working environment and also prevents outdoor work. There is a problem that it emanates and causes air pollution.

The conventional technology for collecting the smoke and dust generated is to surround the entire converter equipment, ladle, steel receiving truck, etc. with a case to form a gas collection chamber (hereinafter referred to as case enclosure) to collect the smoke and dust. BACKGROUND OF THE INVENTION A device for generating air (Japanese Unexamined Patent Application Publications No. 153708/1983, No. 103906/1983, etc.) is well known.

However, these devices have various problems as follows.

That is, as shown in the representative example in Fig. 1, dust and high-temperature gas are generated by the converter b inside the case a, the tilting device of the converter, the charging ladle crane, the steel receiving cart c, and other equipment. Therefore, equipment troubles can have a considerable impact on production failures, as they are exposed to adverse environments. In addition, the furnace body and its surrounding equipment covered by the case enclosure cause an extremely large work hindrance during maintenance such as furnace repair or inspection, and it is inevitable that extra labor and time will be spent compared to an open state. Furthermore, the enclosure of the case inevitably becomes large and the equipment cost also increases.

(3.3) Purpose of the invention The present invention provides a dust collection hood device that eliminates the drawbacks of the prior art as described above.

(3.4) Structure of the invention The following will explain the embodiment of the invention apparatus shown in FIGS. 2 to 4.

FIG. 2 is a side sectional view of the apparatus according to the embodiment of the present invention, FIG. 3 is a view taken along the line A--A' in FIG. 2, and FIG. 4 is a diagram showing an example of application of the apparatus when charging molten steel. 1 in the drawing is a converter, 1
a is the furnace mouth of the converter 1, 2 is the ladle, 3 is the steel receiving cart, 4
7 indicates a moving work floor, 7 indicates a local hood adjacent to the main hood duct 10, and 11 indicates a local duct. Reference numeral 5 denotes a ladle hood that covers the upper part of the ladle 2, and an opening 5a of the ladle hood is provided on one side for allowing the tapped molten steel from the converter 1 to pass through, and a duct 9 is connected to the other side. There is. Reference numeral 6 designates a smoke-inducing enclosure formed in a three-sided enclosure with a wall facing the furnace opening 1a and walls placed on both sides to surround the furnace opening 1a. It is arranged so as to be bent so as to guide it to a position directly below. A ladle hood 5 and a smoke enclosure 6 are provided on the movable work floor 4. Reference numeral 8 denotes a swing plate at the tip of the local hood 7, which has a top plate that can be pivoted vertically in the form of a hinge. The swing board 8 is a drive machine (not shown)
This allows it to be rotated and fixed in any position. 12 is local food for dust gas 11
This is a rectifier plate to guide the flow.

(3.5) Effect Next, the operation of the device of the present invention will be explained.

First, we will discuss dust collection during tapping. In FIG. 2, when the converter 1 is rotated and the furnace opening 1a is directed toward the ladle 2 to start tapping, a large amount of molten steel passes through the opening 5a of the ladle hood 5 and reaches the inside of the ladle 2. Produces smoke. This dust gas generated in the ladle is sucked in the direction of A through the duct 9 by an exhaust fan (not shown), collected and removed without leaking to the outside from the ladle hood 5.

In addition, the dust gas inside the converter 1 rises upward from the furnace opening 1a, but is prevented from scattering to the sides by the smoke trap 6, and is guided by the recessed part of the upper bent part to directly below the local hood 7. reach.

At this time, the swing plate 8 is fixed at a diagonally downward position C, and the dust gas guided to just below the local hood 7 is sucked in the opening direction D of the local hood 7 facing the gas, and is sucked into the local duct 11. The smoke is collected and removed by an exhaust fan (not shown).

When charging the converter, dust is collected at the furnace opening 1 as shown in Figure 4.
From an upright position, tilt a slightly toward the ladle 2 to take the steel receiving position. In this case, the swing plate 8 of the local hood 7 is fixed after being moved to the horizontal position a. When the ladle 2 is gradually tilted by a cargo handling means such as an overhead crane (not shown) and receiving steel is started, a large amount of smoke is generated from the furnace mouth 1a and the opening of the ladle. At this time, the smoke collection opening formed by the local hood 7 and the swing plate 8 is shaped to cover the opening of the furnace mouth 1a and the ladle 2,
As the receiving steel progresses, the ladle 2 is also tilted into the shape shown by the chain line, and as a result, the position of the swing plate 8 is gradually changed from the above-mentioned position a to the upright position b, and the opening of the ladle 2 is covered. By moving along the opening of the ladle 2 while maintaining its shape, the dust gas can be collected without leaking to the outside.

Incidentally, the dust gas generated in the converter during refining is collected in the main hood duct 10.

(3.6) Effects of the invention The device of this invention collects smoke in close proximity according to the movement of the furnace mouth 1a and ladle 2, which are the sources of dust generation, so there is no need to enclose the entire area with a case as in the conventional technology, and only local enclosures are required. This reduces the size of the equipment, avoids bad conditions such as dust, and eliminates various drawbacks of conventional equipment.
Significant improvement effects can be obtained, such as a reduction in equipment failures, a marked improvement in maintainability, and a reduction in equipment investment.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional example of a converter dust collector, Fig. 2 is a side sectional view of an embodiment of the device of the present invention, Fig. 3 is a view taken along the line A-A' in Fig. 2, and Fig. 4 FIG. 2 is an explanatory diagram of an example of application of the present device during charging. 1 is a converter, 1a is a furnace opening, 2 is a ladle, 3 is a steel receiving cart, 4 is a moving work floor, 5 is a ladle hood, 5a is an opening, 6 is a smoke enclosure, 7 is a local hood, 8 is a swing plate, 9 is a duct, 10 is a main hood duct, 11 is a local duct, and 12 is a rectifier plate.

Claims (1)

[Claims for Utility Model Registration] (1) A ladle hood provided above the ladle with an opening on one side and a smoke trap extending upward from the top of the opening, and a duct on the other side; A dust collector for a converter equipped with a local hood with a local duct above the smoke enclosure. (2) The dust collector for a converter according to claim 1, wherein both sides and the upper part of the smoke-inducing enclosure are bent toward the converter. (3) The dust collector for a converter according to claim 1 or 2 of the utility model registration claim, in which a swing plate that can be rotated up and down is attached to the top of the local hood.