JPS6036878A - Method of sealing hearth suitable for continuous use of truck furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The heating energy for the truck part is either intermittent type or continuous type, and the thermal efficiency is poor probably because the temperature of the truck part increases, and it is difficult to find a countermeasure for this problem.

The problem is that the heat energy that has been heated is not allowed to escape. However, due to the structure of the truck, the moving rollers and rails are open spaces, which causes large heat convection and loss, making it impossible to avoid defects.

Taking this point into consideration, in the conventional truck part, the heated object on the hearth is covered with an inner layer and a cover from above, and the periphery is covered with sand,
It was sealed with mortar etc. However, large-capacity inners and covers are extremely expensive to manufacture, and the thermal energy consumed during heating is also a problem. Moreover, the rail part on the upper periphery is damaged and must be repaired every time when the temperature is outside, and the purpose of sealing the furnace gas is also incomplete.

Furthermore, an attempt was made to seal the furnace and equalize the temperature distribution in the furnace by filling it with protective gas, but no good results were obtained.

Generally, the trolley section is divided into a heating section and a cooling section to make it easier to work with, and the trolley is designed so that it can be easily moved in and out of the furnace chamber. However, if the temperature is to be raised in the furnace chamber, complete sealing is desirable.

In order to improve the above-mentioned problems, the present invention implements a method of blocking heat loss caused by airflow through the gap below the hearth and the carriage.

This will be explained using a real-life example shown in the figure below. Two sand boxes are placed around the entire edge of the hearth 1. When the trolley enters the furnace chamber and raises the temperature, the sand box is immediately raised using the packing cylinder 4, and the iron plate skirts 9 added to the side walls, the hearth, and the lower part of the upper and lower operation doors are used to remove the sand. It is buried inside and becomes a completely sealed furnace chamber. Therefore, the heating time was extremely shortened, and the temperature distribution within the furnace chamber differed by only 5° C., and a uniform temperature distribution was achieved quickly.

Depending on each specification, if the furnace temperature is as low as 500℃, 130
In both cases, the furnace temperature at the ceiling, hearth, front wall, rear wall, right side wall, and left side wall differed within 5 degrees Celsius, making it completely sealed. The effect of

Another effect is that of course it saves energy, but the conventional method requires a lot of replenishment of sand and mortar to ensure complete sealing, resulting in high running costs.

In the method of the present invention, the sand is hardly consumed and is semi-permanent, so there is no need for repair. The quality of the sand to be used may be of any heat resistant type, and there is the advantage that low-cost sand suitable for the furnace temperature, such as crushed sand, zircon sand, and alundum powder 3, can be selected.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the bogie furnace seen from above. FIG. 2 is a cross-sectional view when the cart enters the furnace and the temperature rises. Figure 3 is a cross-sectional view that makes it easier to see the top, bottom, operating door, and sandbox holes. 1... Hearth cart part 2... Sand box 3... Hearth wall 4.
・Backing for the top and bottom of the sand box, part of the cylinder 5・
... Wheels of the cart 6 ... Rails for the cart 7 ... Upper, lower, operating doors 8 ... Basket for storing objects to be heated 9 ... Iron plate skirt Patent applicant Touneno Co., Ltd.

Claims (1)

[Claims] As a method for the hearth rail of the trolley section, heat-resistant sand is stored in a sand box, the sand box is raised when the temperature is raised, the furnace is sealed, and the sand box is lowered when the furnace temperature is lowered and when the trolley is pulled out. How to leave it to cool.