JPS5819151Y2 - Batsuful of rotary hearth furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a baffle that can be moved up and down in a rotary hearth heating furnace used for heating steel slabs, etc.

A conventional rotary hearth type heating furnace has fixed baffles for partitioning the inside of the furnace, which is surrounded by inner and outer walls, a rotary hearth, and a ceiling wall.

Therefore, the distance between the top surface of the hearth and the lowest end of the baffle is set according to the maximum dimension (height) of the material placed on the hearth and heated, and this prevents the material from colliding with the baffle. can be passed through.

Therefore, when processing a low-height material with this furnace, an extra gap is created between the material and the baffle, and a large amount of combustion gas flows through this gap, resulting in a large amount of effective Combustion gas will also be emitted.

The present invention aims to provide an improved baffle for eliminating the above-mentioned fuel waste.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In FIGS. 1 to 3, the heating furnace B has an inner wall 1,
A rotary hearth 3 is formed in an annular shape by the outer wall 2 and has an annular flat plate mounting table between the two side walls.

The upper part of the hearth 3 is sealed with a ceiling wall 4.

A charging port 5 for charging the material to be heated A into the furnace is provided at one location on the outer wall 2 of the furnace B, and the charging port 5 is openable and closable. An extraction port 6 is provided in the outer wall 2 on the downstream side along.

Further, an upward exhaust gas lower is bored in the downstream ceiling wall 4 along the material flow near the charging port 5.

The inside of the furnace surrounded by the inner and outer walls 1 and 2, the hearth 3 and the ceiling wall 4 is partitioned by a plurality of (six in this embodiment) baffles 8 installed radially from the center of the furnace B and hanging from the ceiling, Preheating zone C from the upstream side along the flow of material to be heated A
1. Commonly known as heating zone D and soaking zone E.

The inner wall 1 and the outer wall 2 of the preheating zone C1 heating zone are constructed of high-temperature ceramics 1a and 2a, respectively, at the portions close to the inside of the furnace, and low-temperature ceramics lb and 2b are stretched on the outside thereof.

In the inner wall 1, the outer surface of the low-temperature ceramic 1b is further covered with a heat-resistant steel plate 1C.

A plurality of gas burners 1d and 2d are opened on the inner and outer sides 1 and 2 of the preheating zone C and heating zone of the furnace.

A charging machine and an extractor (
(Nothing shown) is installed.

Guide metal fittings 9a and 9b each having a concave horizontal cross section are erected on the inner side of the inner wall 1 and outer wall 2 of the furnace with their concave grooves facing each other, forming the inner surface of the furnace. sealed and fixed.

The guide hardware 9a, 9b has a hollow portion 91 formed therein, and by passing water into the hollow portion 91, the temperature rise of the hardware itself and the surrounding ceramic is controlled.

The baffle 8 of the present invention is fitted at both horizontal ends into the concave grooves of the guide hardware 9a, 9b so as to maintain a minute gap.

The baffle 8 is installed along the concave groove and penetrates the ceiling wall 4, and is movable up and down in the furnace so as to slide on the surface of the opening 4a of the ceiling wall 4 while maintaining a small gap.

The surface of the opening 4a of the ceiling wall 4 is covered with a heat-resistant steel plate 41.

In addition, the baffle 8 includes a main body 81 having a cooling water pipe therein as shown in FIG.
It further includes a seal piece 83 that protrudes in the upstream and downstream directions and has a downwardly bent tip.

Furthermore, seal water tanks 41 are provided before and after the baffle 8 on the ceiling wall 4 through which the baffle 8 passes.

The tip of the seal piece 83 is set to be immersed in the water tank 41 at all times within the range of elevation of the baffle 8.

The baffle 8 is pinned to a link 85 via a lifting column 84, and further connected to an electric winch (not shown) via a lifting chino 86 and a lifting sheave 87, and is driven up and down by the operation of the electric winch. Ru.

The combustion gas seal structure using the seal water tank 41 and the seal piece 83 is also applied to the seal between the baffle 8 and the inner wall 1 and outer wall 2.

Therefore, the ceiling wall 4 and the baffle 8 are kept airtight over the entire surface of the baffle 8.

Note that the reference numeral 21 shown in FIG. 1 is an inspection window provided on the outer wall of the furnace.

Next, the operating state will be explained.

The material to be heated A is charged into the furnace through the charging port 5 and placed on the hearth 3, and is gradually carried downstream as the hearth 3 rotates to the left (counterclockwise).

Therefore, the heated material A generally has a cross-sectional shape of 270
~ 559 mm, and the height is within the range of 100 to 700 mm, so before charging, the hearth 3
The distance between the upper surface of the baffle 8 and the lowermost end of the baffle 8 is adjusted.

That is, the electric winch is operated to raise and lower the baffle 8, and the distance is adjusted to the minimum necessary height that allows the material to pass through.

To check this set interval outside the furnace, it is sufficient to install a known gauge at an appropriate location.

When the baffle 8 takes the lowest position, the bottom surface of the support part 82 is supported by the top surface of the ceiling wall 4 and stops.

The combustion gas heats the material to be treated by flowing over the hearth 3 from the downstream side to the upstream side along the material feeding direction, advances to the upstream side, and is discharged as exhaust gas from the exhaust gas lower.

According to implementation results, this idea reduced fuel consumption by approximately 3.
Improved by 0%.

As described above, in this invention, the baffle can be raised or lowered according to the height of the material to be heated, and can be set to keep the distance from the hearth to the minimum necessary limit, so that the combustion gas flowing below the baffle can be The volume is reduced, resulting in less effective gas emissions and helping to save fuel.

Moreover, since the baffle body, the ceiling wall, and the inner and outer walls of the furnace are sealed, there is no leakage of combustion gas due to the ability to raise and lower the baffle, making the above effect even more remarkable.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of an embodiment of the present invention excluding the ceiling wall, Fig. 2 is an enlarged cross-sectional view of the main part of Fig. 1, and Fig. 3 is a cross-sectional view of Fig. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2. A is the material to be treated, B is a rotary hearth furnace, C is a preheating zone, D is a heating zone, E is a soaking zone, 1 is an inner wall, 2 is an outer wall, 3 is a hearth, 4 is a ceiling wall, 5 is a 6 is an extraction port, 7 is an exhaust gas port, 8 is a baffle, and 9 is a concave seal metal fitting.

Claims (1)

[Scope of utility model registration request] A baffle for partitioning the furnace can be raised and lowered by penetrating the ceiling wall, and the baffle body and the ceiling wall are connected to a sealing piece that protrudes around the baffle above the ceiling wall and has its tip bent downward. and a seal water tank provided in the ceiling wall soil, and the baffle body is slidably fitted into a groove in a guide metal fitting that is sealed to the inner and outer walls of the furnace and has a concave portion facing the inside of the furnace. A baffle for a rotary hearth furnace characterized by: