JPS5987016A - Dust removing device of blast furnace - Google Patents

Abstract

PURPOSE:To prevent the dust generation during dust delivery and the leakage of noxious gas, by a method a reticulated partition plate is provided in a dust storage hopper while rising gas is blown into said hopper to fluidize the stored dust which is, in turn, delivered by the internal pressure of a dust removing device. CONSTITUTION:A porous plate 11 is provided to the lower part of the dust storage hopper 5 of a gravitational precipitation type dust removing device 3 and inert gas from a system 12 or gas obtained by compressing the gas generated from a blast furnace and subjected to dust removal by a secondary dust collector is introduced into the hopper to fluidize the stored dust. When dust is delivered, a cut-off valve 14 of a dust delivery pipe 13 is opened and dust is delivered to a dispersing device 15 at high concn. by the pressure in the dust removing device 3. High pressure gas is blown into the dispersing device 15 from a system 16 to dilute the high concn. dust and the diluted dust is conveyed to a sintering factory for re-utilizing the dust in a solid-gas two-phase stream through a conveying pipe 17. In order to prevent a large lumpy charged stock material accompanied by furnace top gas from being mixed in the delivery pipe 13 when abnormal blowing-through is generated during the operation of the blast furnace, a reticulated partition plate 10 is provided in the hopper 5 and the large lump is taken out from a manhole 18 during the idle time of the blast furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gravity settling type deexpanding device for a blast furnace having a dust cutting mechanism.

FIG. 1 shows an example of a method for cutting out dust stored in section (C) of a conventional remover. The scum generated at the top of the blast furnace is included in the total amount of powder of the charged raw material and passes through the downcomer 1 and enters the dust remover 3. Furnace top gas is downcomer
The flow direction is reversed at the lower end open part of the expanding pipe 2 following the flow, and the flow rises at a low speed inside the eliminator 3, passes through the entire eliminator outlet pipe 4, and is used for secondary dust collection such as a Venturi scrubber or an electric concentrator. Most of the dust entrained in the top gas led to the device is separated from the top gas due to the difference in specific gravity when the flow direction is reversed in the dust remover and stored in a dust storage hopper at the bottom of the dust remover. accumulate. The dust in the hopper is normally removed from the dust cutting pipe 6V periodically (generally 1 to 3 times a day) during blast furnace operation.
' - The installed shutoff valve 7°8 is opened, and the bag mill 9, which has a built-in turning plate rotated by an electric motor, is cut into a truck (or freight car) and placed at a predetermined place for reuse.
For example, it is transported to a sintering factory or a pellet factory).

With conventional equipment, a layer of powder is generated when the dust is loaded into the truck, and it also develops during transport by truck, posing problems in the working environment. The cutting work required several workers, creating a dust-producing environment as well as a dangerous environment where toxic furnace top gas leaked, posing problems in terms of health and safety as well as labor-saving. In terms of equipment, it is necessary to secure a space for the trunk to fit under the dust extraction device, so the dust remover main body 3 has to be installed high above the ground, which increases the equipment cost by 10,000 yen. There is.

In addition, sometimes in the blast furnace stairwell, the raw materials charged in the blast furnace get mixed into the dust remover and clog the dust removal device, and the shadow of moisture is generated.
In some cases, the dust may hang on the shelf in the storage pumper 5, making it impossible to cut out the dust.

The present invention has been proposed to solve the problems of the conventional method, and the present invention will be explained below with reference to FIG. A dust cutting pipe 13 is provided at the center of the pipe. In the lower chamber of the perforated plate 11, an inert gas (for example, crab gas, etc.) or a pressurized blast furnace generated gas, which has been removed by a secondary dust collector installed downstream of the main clearing device, is supplied from the system 12. Introduce. These inert gases or blast furnace generated gases pass through the perforated plate 11, are stored, and rise while fluidizing the stored dust. When cutting out dust, the shutoff valve 14 installed in the dust cutting pipe 13 is opened, and the dust is cut out at a cylinder concentration into the disperser 15 by the pressure inside the dust remover 3. Next, high-pressure gas is blown into the LR 15 through the system 16 connected to this disperser 15, which dilutes the humidity dust and turns it into a solid-gas two-phase flow, which is then transferred to the conveyor pipe 1'7 to reuse the dust. Transport it to a predetermined location such as a sintering factory or pellet factory.

During the operation of a blast furnace, abnormal blow-through may occur from time to time, and at this time, a large lump of charging material may be entrained in the furnace top gas and enter the deburrer. Such large lumps pose a danger of clogging the labor coffin 15 and the transport pipe l'7, so to prevent this, a mesh is installed in the dust storage hopper 5 to prevent large lumps from getting mixed in. A partition plate 10 having the shape of a shape is provided inside.The large lumps accumulated on the partition plate can be taken out from the manhole 18 to the outside of the embankment when the blast furnace is periodically shut down.

The dust remover according to the present invention can completely prevent the development of dust during extraction and the leakage of toxic gases, and can eliminate the need to transport dust by trucks and freight cars, thereby improving the working environment, preventing air pollution, saving labor, and reducing transportation costs. This is an extremely effective device as it enables the removal of dust from the ground, and by reducing the space required to carry the truck in at the bottom of the dustproof device, the height of the de-expanding device from the ground can be lowered, thereby reducing equipment costs.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a dust removal method of a blast furnace dust remover that has been generally employed in the past. Figure 2 shows the bath ore furnace dust remover according to the present invention? This is the diagram shown. 1... Downcomer 2... Expansion pipe 3... Dust remover 4... ... Head removal outlet pipe 5... Dust storage hopper 6. 13... Das 1, cut snow・7.8.14・
・Shutoff valve 10...Partition plate Jl...Perforated plate 12.16...Gas thread Applicant Nippon Steel Corporation

Claims (1)

[Claims] A mesh-like partition plate is installed in the dust storage hopper of the gravity settling type deexpanding device, and the blast furnace gas or inert gas, which is pressurized from the bottom of the hopper, is filled with a gold layer, and the stored dust Hr is fluidized while inside the dust remover. A blast furnace dust remover, characterized in that the dust is cut out by pressure, and furthermore, a conveying gas inlet is formed in the cut out part, and the dust is conveyed to a predetermined location by the gas.