JPH0313516A - Perpendicular chute for bell-less charging device - Google Patents

Abstract

PURPOSE:To prolong the life of the perpendicular chute without requiring a large quantity of cooling gas flow and to prevent heat deformation by forming a passage in which a cooling medium flow in the wall of the perpendicular chute for passage of raw materials mounted in the bell-less type furnace top charging device. CONSTITUTION:The wall body of the perpendicular chute 1 for passage of raw materials mounted in the bell-less type furnace top charging device 11 installed to the top part of a blast furnace is formed by providing a coil 2 between a casing 3 and an internal liner 4 and injecting a packing material 5 of good heat conduction therebetween. The cooling water is supplied through a feed water pipe 6 to this coil 2, absorbs heat between the casing 3 and the internal liner 4 and is discharged from a drain pipe 7 to the outside of the furnace. The initial and running costs of the charging device 11 are reduced in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a vertical chute incorporated in a bellless blast furnace top charging device.

[Prior art J] Conventionally, in bellless charging equipment, cooled gas (N
It was customary to cool the equipment by blowing a large amount of (or blast furnace gas) into the equipment from the outside. However, in this type of cooling, the operating cost for blowing gas increases and the equipment cost becomes extremely expensive.

In order to overcome this drawback, a water-cooled bellless charging device proposed in Japanese Patent Application Laid-open Nos. 59-116305 and 59-116306 has been commercialized and put into practical use since 1984.

By the way, in this water-cooled device, although consideration has been given to cooling the bellless charging device itself, no consideration has been given to cooling the vertical chute incorporated within this device. The vertical chute is installed so that it passes through the bellless charging device in the vertical direction, and serves as a passage for guiding the material to be charged into the blast furnace into the furnace.It also functions as a liner to protect the bellless charging device itself from wear. It is a vibrator-like structure. FIG. 4 shows a conventional vertical chute 1 consisting of a casing 3 and a liner 4 lined on its inner surface.

This vertical chute is directly exposed to the gas inside the blast furnace, so it becomes quite high temperature if it is not cooled. However, in the conventional bell-less charging system that blows cooling gas, the atmosphere in the furnace near the vertical chute is heated up by the cooling gas. The temperature of the vertical shoot itself did not become very high because the temperature was lowered by dilution.

However, in the case of a water-cooled bellless charging device developed with the aim of reducing equipment costs and operating costs, the temperature around the vertical chute is almost the same as the ambient temperature in the furnace, and becomes quite high. As a result, the vertical chute becomes hot, its wear resistance deteriorates, thermal deformation occurs, and in extreme cases, the thermally deformed vertical chute interferes with the rotating table of the bellless charging device, making it impossible to operate. There has occurred.

If the bell-less charging equipment suddenly stops like this, the steelworks' pig iron production, blast furnace gas power plant, heating furnace, etc. will immediately stop, resulting in a shutdown of the entire steelworks, resulting in lower energy costs. Otherwise, the damage caused by production disruption will be enormous.

Furthermore, even when contact accidents do not occur, the wear resistance decreases, resulting in a shortened lifespan, leading to an increase in maintenance costs.

[Problems to be solved by the invention] As described above, the water-cooled bellless charging device has the following problems.
Although it is superior to the conventional gas-cooled bellless charging system in terms of equipment costs and operating costs, it is inferior to the gas-cooled system in terms of maintenance costs and reliability, so its advantages cannot be fully utilized. There wasn't.

[Means for Solving the Problems] The present invention is intended to solve all of these problems, and is directed to a method for guiding blast furnace charging material installed in a bellless top charging device installed at the top of the blast furnace. The vertical chute is characterized in that a passage through which a cooling medium flows is formed in the wall of the chute.

[Operation 1] In the present invention, cooling water is guided from the outside of the furnace to a vertical chute inside the furnace, and is discharged to a return location where the vertical chute is cooled. Therefore, a large amount of cooling airflow is not required,
Contributes to increasing the lifespan of vertical shades and preventing thermal deformation.

As the cooling medium of the present invention, the above-mentioned cooling water may of course be used directly as a heat removal material, or a heat vibrator or the like may be used and the cooling medium may be used as an intervening medium.

[Embodiment 1] One embodiment of the present invention will be described with reference to FIG. FIG. 1 shows the main parts of a bellless furnace top charging device 11, which consists of a vertical chute 1, a distribution chute 10, a rotating device 12, and the like. FIG. 1 (bl shows only the vertical chute 1).

Cooling water supplied from outside the furnace to the vertical chute 1 through the water supply vibro passes through a flexible pipe 2 embedded in the vertical chute 1, removes heat from the casing 3 and the liner 4, and is then discharged to the outside of the furnace through the drainage vibrator 7. Casing 3. Snake pipe 2. The space between the liners 4 is injected and filled with a filler 5 to improve heat conduction.This filler may be any material as long as it is chemically stable and has an appropriate thermal conductivity. In this example, silicon carbide mortar is used.

FIG. 2 shows an example in which a jacket 3a is provided on the casing 3 of the vertical chute 1, and cooling water is circulated through the jacket 3a.

FIG. 3 shows an example in which a heat vibrator 8 is used to transport heat in the vertical direction, and is embedded between the casing 3 and the liner 4. A filler material 5 is placed in the gap around the heat vibrator 18, as in Example 1. It is set up.

In this example, even if the liner 4 is partially worn and the heat vibrator 8 is exposed and damaged, the cooling water will not leak into the furnace (
In addition, since it is unlikely that all the heat vibes 8 are damaged at the same time in the circumferential direction, there is no need for redundant cooling pipes, and the heat exchange that takes out the heat from the heat vibes 8 is done using a casing. Heat is exchanged with cooling water supplied from the outside in a ring-shaped header 9 provided on the top of the cooling water. Although these waste water may be directly drained to the outside, there is no problem even if some of the water is used for cooling the water-cooled bellless charging device body 11 again.

[Effect of the Invention 1] According to the present invention, it is possible to reduce maintenance costs in a water-cooled bellless charging device and ensure reliability comparable to that of a gas-cooled bellless charging device, and the economic effects thereof are significant.

[Brief explanation of the drawing]

FIG. 1 shows (a) a vertical sectional view of a water-cooled bellless charging device according to an embodiment of the present invention, (b) a vertical chute-part side view,
2 and 3 are partially sectional side views showing variations of the cooling structure, and FIG. 4 is a partially sectional side view of a conventional vertical chute without cooling. l...Vertical chute 2...-Serial pipe 3--Casing 3a...Jacket 4--Liner 5...Filler 6...Water supply pipe 7...Drainage pipe 8--Heat pipe 9 ...Ring header 10...-Distribution chute 11...Water-cooled bellless charging device 12...Swivel device

Claims (1)

[Scope of Claims] 1. In a vertical chute for passing raw material installed in a bellless top charging device installed at the top of the blast furnace, a passage through which a cooling medium flows is formed in the wall of the chute. A raw material chute featuring