JPS5837947Y2 - Continuous slab heating furnace - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a continuous heating furnace for slabs, and aims at uniform heating of slabs in the heating furnace.

As is well known, a continuous slab heating furnace has a preheating zone, a heating zone,
It consists of a soaking zone, and the preheating zone and heating zone are equipped with multiple rows of skids that support the slab, and there are two types: a pusher set and a walking beam type.

In both the pusher set and walking beam type, the slab charged into the furnace is heated to almost the extraction temperature in the preheating zone and heating zone, but the heating unevenness (skid marks) due to the skid (water cooling) is large, making it difficult to roll. To avoid this, the next step is soaking in the soaking area to reduce skid marks before extraction.

However, in conventional continuous heating furnaces, the top and bottom parts of the slab in the preheating zone and heating zone are heated from two sides, with the central part of the slab heating from the ceiling and the bottom of the furnace.
The temperature is extremely high because heating occurs from three sides: the ceiling, the furnace bottom, and the furnace side walls. Especially in the case of long slabs that protrude from the skid, there is a disadvantage that there is a significant temperature difference between the top and bottom parts of the slab and the skid part. , the soaking time in the soaking zone was long, which was a major factor in worsening the fuel consumption rate.

This idea is an improvement to solve the above-mentioned conventional problems.By newly installing cooling skids in the parts corresponding to the top and bottom parts of the slab in the heating zone, This is characterized by preventing overheating of the bottom portion.

In other words, the idea is to install skids on both sides of the skid in the heating zone where there is a significant temperature difference between the top, bottom and skid parts of the slab, and to place the skids at the top and bottom of the slab above the skids in the heating zone. One embodiment of this will be explained below using a pusher-equipped continuous heating furnace as an example.As shown in Figs. In the conventional skid 4-1, the skids 4-1 are located on both sides of the skid group 4 of the heating zone 2 between the skids 4-1 at both ends and the furnace side wall 6, and are at the same height as the conventional skid 4-1. A cooling skid 8 is arranged by a support 7 so that the cooling skid 8 is in the same position as that shown in FIG.

The cooling skids 8 are installed so that they are located at the top and bottom of a slab of maximum length that can be loaded into the furnace.

Furthermore, although this skid is shown in the drawing as being installed over the entire length of the heating zone 2 in the longitudinal direction, the length of the skid does not necessarily have to be the same as the entire length of the heating zone.
Alternatively, the optimum length should be selected depending on the furnace, such as approximately 1/2 or 2/3 of the total length of the heating zone from the boundary with the soaking zone 3.

It goes without saying that this cooling skid also has a water-cooled structure like the conventional one.

As mentioned above, when the cooling skids 8 are newly installed along the furnace side walls on both sides of the skid group of the heating zone 2, among the slabs conveyed on the skid 4-1 of the heating zone, especially the skid 4-1 In the case of the long slab 9 protruding from both sides, the top and bottom portions are in contact with or close to the cooling skid 8, so that overheating of the top and bottom portions is prevented.

Therefore, the temperature difference between the top and bottom portions of the slab and the skid portion is smaller than in conventional furnaces without cooling skids.

As mentioned above, this idea is based on the installation of new cooling skids close to both side walls of the heating zone, which reduces the temperature difference between the top and bottom of the slab and the conventional skid section. This makes it possible to shorten the soaking time in the rolling process, thereby reducing the fuel consumption rate, and also has great effects in terms of rolling operations and quality.

Although the case where the present invention is applied to a continuous heating furnace with a pusher set has been described here, it goes without saying that similar effects can be obtained even when applied to a walking beam type.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of essential parts of a continuous heating furnace with pusher set showing one embodiment of this invention, and Fig. 2 is a cross-sectional plan view of the main parts of a continuous heating furnace with a pusher set, and Fig. 2 is a plan view of Fig. 1 II-II.
FIG. In the diagram: 1...Pre-heating zone, 2...Heating zone,
3...Soaking zone, 4...Skid group, 4
-1... Conventional skid, 5... Support, 6... Furnace side wall, 7... Support, 8...
...cooling skid, 9...slab.

Claims (1)

[Scope of utility model registration request] In a continuous heating furnace consisting of a pre-heating zone, a heating zone, and a soaking zone, cooling cooling devices are placed on both sides of the skid in the heating zone at the same height as the skid, as if located at the top and bottom of the slab installed in the furnace. A continuous slab heating furnace featuring a skid.