JPH03260592A - Scale discharge apparatus of heating furnace - Google Patents

Abstract

PURPOSE:To eliminate the possibility such that the open air flows in a heating furnace and to perform the discharge treatment of scale while the heating furnace is operated by providing water tank under the scale falling passage communicating with the heating furnace so as to seal the outlet of the passage by the surface of the water and providing a scale feed-out means in the water tank. CONSTITUTION:A scale discharge apparatus 1 is equipped with a water tank 3, a surface-of-water control apparatus 4 and a scale feed-out apparatus 5. The scale separated from the steel material K transferred into a heating furnace 100 passes through falling passages 2 from the receiving ports 2a of a furnace floor 100a to fall in the water W stored in a water tank 3 from outlets 2c. At this time, since the surface of the water W stored in the water tank 3 is controlled by the surface-of-water control apparatus 4 so as to always seal the outlets 2c, there is no possibility such that the open air flows in the heating furnace through the falling passages 2. The scale accumulated on the bottom part 3a of the water tank 3 is cooled by the water W and successively transferred by the scraping plate 7 of the feed-out apparatus 5 to be fed out of the upper end discharge part 9 of the water tank 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scale discharge device suitable for scale treatment in a steel heating furnace.

[Conventional technology]

In general, in steel heating furnaces, scale (metal oxides) peels off from the surface of the steel that is transferred using a walking beam method (or hearth method) and falls into the hearth (particularly noticeable near the extraction port). . The scale is
If it accumulates on the hearth, it will cause equipment failure, so in the past,
A scale discharge device for a heating furnace has been used in which a scale storage chamber is provided in the hearth, and when a predetermined amount of scale has accumulated in the storage chamber, it is taken out to the outside.

That is, the conventional scale discharge device for a heating furnace, as shown in FIG. , the storage chamber 110 is provided in the hearth 100a of the steel heating furnace 100, and the bottom cover 1 of the storage chamber 110 is
11 was opened to discharge the scale S deposited inside. R is a roller for transferring the steel material.

[Problem to be solved by the invention]

The conventional scale discharge device described above is configured to discharge the scale accumulated inside the scale storage chamber by opening the bottom cover, so the storage chamber becomes a communication path and outside air flows into the heating furnace. The heating furnace had to be temporarily shut down. However, stopping the heating furnace not only wastes a large amount of energy, but also causes a serious problem in that it shortens the life of the furnace.

In addition, the scale deposited in the scale storage chamber gets hotter as it goes upward, especially near the top layer, which reaches 1000°C.
Some reach a certain degree. For this reason, the scale discharge work is dangerous, and there is a possibility that the worker may be burned.

In view of the above-mentioned points, it is an object of the present invention to provide a scale discharge device for a heating furnace, which can discharge scale without stopping the heating furnace, and is free from the risk of exposing high-temperature scale to the working environment. .

[Means to solve the problem]

In order to achieve the above object, the scale discharge device for a heating furnace according to the present invention is provided with a water tank below the scale falling passage communicating with the heating furnace, which seals the outlet of the passage with a water surface, and a water tank that seals the exit of the passage with a water surface. The system is equipped with a scale transport means, and by preventing outside air from entering at the water surface, the scale can be guided into the water tank while the furnace is operating. Furthermore, by cooling the scale in water and then transporting it out of the tank, the high-temperature scale is prevented from being exposed.

〔Example〕

The present invention will be described below based on an embodiment shown in the accompanying drawings.

Figure 1 is a sectional view of the scale discharge device of the present application, Figure 2 is a perspective view of the scale carrying out section, Figure 3 is a sectional view of the scale dropping passage, Figure 4 is a front view of the scale carrying out part, and Figure 5 is the conventional FIG. 2 is a cross-sectional view of the device.

In the figure, reference numeral 1 denotes a scale discharge device according to the present invention, and the scale discharge device 1 is equipped with a water tank 3, a water level control device 4, and a scale carry-out device 5, and is disposed below a scale fall passage 2 communicating with a heating furnace 100. It is set up. The scale fall passage 2 has a funnel-shaped reception port 2a in its upper part that communicates with the bottom surface 100a of the heating furnace 100, and the scale exfoliated from the steel material K in the furnace 100 is introduced into the passage 2b through the reception port 2a. Then, it can fall further downward from the exit 2C at the bottom. Further, a heat insulating material is provided around the passage 2b, so that the heat inside the furnace 100 is transferred to the scale falling passage 2b.
This prevents it from dissipating to the outside via the

The water tank 3 is configured to be able to seal the outlet 2c of the scale falling passage 2 with the water surface of the water W stored in the tank, and prevent outside air from flowing into the heating furnace 100 through the outlet 2c. That is, the upper limit of the water surface height of the water storage W is the height of the upper edge of the water tank 3, and the lower limit is the exit 2C of the scale falling passage 2.
It is controlled by the water surface control device 4 so that the tip height is within the range of . The water level control device 4 includes, for example, a water level sensor and a water amount adjustment device. & (both not shown).

The scale carrying-out device 5 includes a chain 6 that can circulate inside the water tank 3, and scale scraping plates 7 provided on the chain 6 at predetermined intervals.

The scale scraping plate 7 is configured so that its tip rotates around the bottom surface 3a of the water tank 3, and sequentially transfers the scale accumulated on the bottom surface 3a from the upper discharge end 9 of the water tank 3 to the discharge gutter 10. It is ready to be transported. Reference numeral 8 denotes a sprocket, which is used to drive the chain 6 and is provided at an appropriate position on the wall of the water tank 3.

It goes without saying that a belt conveyor or the like may be used as the means for conveying the scale within the water tank 3. Furthermore, if the scale carrying-out device 5 is constructed using the above-mentioned drawing board method, the scale will be transferred to the upper discharge end 9 of the water tank 3 along with the water.
However, for post-processing reasons, it may be desirable to keep the water free of moisture. In this case, for example,
A belt conveyor capable of circulating inside the water tank 3 may be used, and the belt of the conveyor may be constructed of a mesh belt to drain the water before discharging the water to the outside of the tank.

The discharge gutter 10 is for causing the scale to slide down under its own weight and guiding it to the pit 11, from a gutter-like slideway constructed between the upper discharge end 9 of the water tank 3 and the pit 1-11 on the ground surface. It has become.

In the above embodiment, the scale exfoliated from the steel material K transferred in the heating furnace 100 is removed from the receiving port 2a of the hearth 100a.
The water passes through the fall passage 2 and falls into the water storage W of the water tank 3 from the outlet 2c. At this time, the water surface of the water storage W in the water tank 3 is controlled by the water surface control device 4 so as to always seal the outlet 2c, so there is no risk of outside air flowing into the heating furnace through the drop passage 2. The scale deposited on the bottom 3a of the water tank 3 is cooled by the stored water W, and is sequentially transferred by the scraping plate 7 of the carrying out device 5, and is carried out from the upper end discharge part 9 of the water tank 3. Furthermore, the scale carried out slides down along the scale derivation gutter 10 and is deposited in the pit 11, after which it is processed by appropriate means (for example, a conveyance truck).

〔Effect of the invention〕

As mentioned above, the heating furnace scale evacuation device of the present invention has the following features:
The feature is that a water tank is provided below the scale falling passage communicating with the heating furnace, and the outlet of the passage is sealed with a water surface, and a scale carrying means is provided in the water tank, so that outside air is not allowed to enter the heating furnace. The scale can be discharged while the heating furnace is running without fear of the scale flowing into the furnace. Also,
Since the scale is cooled in water before being carried out, it is highly safe to work with and can be disposed of efficiently.

As a result, an outstanding effect is achieved in that it is possible to simultaneously realize energy savings in the heating furnace and improvement in the safety of scale treatment.

[Brief explanation of drawings]

Figure 1 is a sectional view of the scale discharge device of the present application, Figure 2 is a perspective view of the scale carrying out section, Figure 3 is a sectional view of the scale dropping passage, Figure 4 is a front view of the scale carrying out part, and Figure 5 is the conventional FIG. 2 is a cross-sectional view of the device. 1.-Scale discharge device 2--Scale falling passage 2a-Intake port 2a-Outlet 3-Water tank 3a-・Bottom 4-Water surface control device 5.--Scale carry-out device (scale carry-out means) 6--
- Chain 7 - Scale scraping plate 8 - Sprocket 9 - Upper discharge end 10 - Scale outlet gutter 11 - Scale pit 100 - Heating path 100a - Bottom surface 101 - Extraction port 110 - Scale discharge device (conventional device) ) 110 a-Intake port 110b-・On bottom cover-m-Steel material R---m-Transport roller S・-Scale

Claims (1)

[Claims] A scale discharge device for a heating furnace, characterized in that a water tank is provided below a scale falling passage communicating with the heating furnace, the outlet of the passage being sealed with a water surface, and a scale carrying means is provided in the water tank.