JPS5848549Y2 - Raw material charging device for vertical reduction furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention d1 relates to a raw material charging device for a vertical furnace for gas reduction of iron ore, pellets, etc. with reducing gas.

In a conventional raw material charging device, for example, as shown in Fig. 1, raw materials are charged into the furnace through a plurality of charging pipes 1 provided outside the top of the furnace in order to improve the particle size segregation of the contents in the furnace. I'm doing it like that.

However, it has recently been confirmed that high-pressure operation is effective in improving the productivity of reduction furnaces.

In order to perform this high-pressure operation, a separate hopper, gate valve, seal valve, etc. are naturally required, but if these are installed in a conventional charging device, the height of the device becomes extremely high. was.

Therefore, in order to solve these problems, a charging device as shown in Fig. 2 has been provided as a device that lowers the furnace height as much as possible, can sufficiently cope with high-pressure operation, and has less particle size segregation inside the furnace. There is.

That is, in a vertical reduction furnace equipped with a pressure equalization tank 8, a partition plate is provided inside the upper part of the reduction furnace to form a storage space for raw materials,
A storage hopper 3 is configured in the furnace by suspending and fixing one or more charging pipes 5 through which raw materials flow down to the partition plate, and a charge stock line having the apex at the lower end of the partition plate and the pipe is formed. This charging device has an exhaust gas outlet pipe 11 on the wall of the reduction furnace in the space formed between the two.

However, when such a charging device is used to charge raw materials, the particle size distribution of the charge in the storage hopper 3 tends to have many fine particles near the charging position and an increase in coarse particles toward the periphery.

This is due to the dynamic flow caused by falling raw materials.

This tendency becomes more pronounced as the diameter of the reduction furnace increases.

When such particle size segregation of the charge occurs in the storage hopper 3, similar particle size segregation occurs in the reduction furnace main body 2 via the charging pipe 5.

This appears as a biased flow of the reducing gas, and eventually affects the productivity of the reducing furnace.

In the present invention, in order to improve these problems, a third charging cylinder 4 is installed in the storage hopper 3 of the charging device configured as described above.
It is installed as shown in the figure.

The present invention will be explained below.

In the charging device of the present invention having the above configuration, the raw material 6 flowing out from the gate valve 10 is temporarily stored in the charging cylinder 4, and dynamic flow due to falling of the raw material is stopped.

Thereafter, by cutting out the contents from the lower part of the reduction furnace 2, the raw material in the charging cylinder 4 gradually flows out into the storage hopper 3.

As described above, by extinguishing the kinetic energy of the raw material in the charging tube 4, the 'D particle size segregation in the storage hopper 3 is improved, and this improves the particle size segregation in the reduction furnace 2 via the charging tube 5. It is something that will be done.

As described above, according to the present invention, it is possible to improve the grain size segregation of the charge in the furnace, and it is expected that the productivity of the reduction furnace will be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of a conventional raw material charging device for a vertical reduction furnace, FIG. 2 is a diagram showing an example of a high-pressure operation device, and FIG. 3 is an explanatory diagram of an example device of the present invention. DESCRIPTION OF SYMBOLS 1... Charging pipe, 2... Reduction furnace main body, 3... Storage hopper 4... Charging cylinder, 5... Charging pipe, 6... Raw material,
7... Gate valve, 8... Equalizing pressure pipe, 9... Seal valve, 10... Seal valve, 11... Exhaust gas pipe.

Claims (1)

[Scope of utility model registration request] In a raw material charging device, a storage hopper is formed in a furnace top main body, and a lower part of the storage hopper is communicated with the inside of the furnace via a plurality of charging pipes, and a charging cylinder is provided in an upper part of the storage hopper. A raw material charging device for a vertical reduction furnace, which is characterized by the fact that: