KR100398406B1 - Pression apparatus for charing hopper of blast furnace - Google Patents

Abstract

The present invention relates to a pressure regulating device of a charging hopper of a blast furnace to prevent air pollution and environmental pollution in the blast furnace, the technical configuration of the two hopper hopper in the blast furnace equalization sequence at the same time and alternately mutually As the equalization is progressed, the gas used to equalize one top hopper is refilled to another top hopper installed on the side of atmospheric pressure. The point is to be attached.

Description

Filling hopper pressurization device of blast furnace {PRESSION APPARATUS FOR CHARING HOPPER OF BLAST FURNACE}

The present invention relates to a pressure equalizing device of a charge hopper during a blast furnace raw material charging process, and more particularly, to a charging hopper pressurization device of a blast furnace of a two bunker system of a bellless type blast furnace. .

The general raw material charging method of the blast furnace will be described briefly with reference to FIG.

In order to smoothly supply the raw material to the blast furnace 1c where the pressure of 2.50 to 2.65 kg / cm2 (hereinafter referred to as the nominal pressure) is always applied, the hopper blocked by the blast furnace 1c and the valves 5 and 6 ( 1a) (1b) shall be made at atmospheric pressure, and the raw material transferred through the charging belt conveyor (2) shall be loaded and pressurized above the nominal pressure to charge the furnace.

Here, the process of depressurizing the hopper and the equalized pressure to atmospheric pressure is referred to as "back pressure".

When the raw materials (coke and iron ore) cut out from the raw material hopper 1 are transferred to the upper part of the blast furnace by the charging belt conveyor 2, the switching chute 3 receives the raw materials from the two top hoppers 1a and 1b. (Raw material dump and back pressure sequence start), the back pressure valve (8) opened for back pressure is closed and at the same time the closed side (4) of the top of the top hopper open to transfer to the charging conveyor (2) Will receive.

At this time, all of the related valves 5, 6, 7a, 7b, and 8 except for the above-mentioned upper sealing valve 4 are in a closed state.

Subsequently, when the raw material is totally granulated in the top hoppers 1a and 1b, the top weighing machine issues a full signal, thereby closing the open top sealing side 4 and starting the equalization sequence.

The equalization is carried out by dividing the primary pressure using the blast furnace gas and the secondary pressure using the nitrogen gas, the primary pressure is the atmospheric pressure state of the semi-clean gas from the gas purifier at the back of the furnace by opening the primary pressure equalizer (7a) The pressure of the top hopper (1a) (1b) to 2.55kg / cm2 (when setting the pressure 2.60kg / cm), and then the primary equalization valve (7a) is closed and the secondary equalization valve (7b) is opened to the nitrogen gas. After the pressure by 2.60kg / ㎠ the secondary pressure equalizing valve (7b) maintains it.

The pressure equalization is completed when the pressure of the top hopper reaches the top pressure + 0.05kg / ㎠, and then when the charging level meter of the blast furnace reaches the charging baseline, the raw material is charged into the blast furnace and then enters the back pressure sequence. .

In the back pressure sequence, the secondary pressure equalizing valve 7b, which was open to back pressure of the top-loaded hopper completed to atmospheric pressure, is closed, and the back pressure valve 8 is opened at the same time to release all the internal filling pressure of the top hopper to the atmosphere. Will be done.

However, in addition to the air release method, the method of recovering the entire amount and reusing it as a fuel gas causes air pollution in the case of air discharge, and in the case of the recovery method, the efficiency of the gas cleaning device, which is a post-process due to the influx of dust in the top hopper, is reduced. In addition to the increase in the rate of containment of the furnace gas, there was a problem such as clogging, combustion failure of the hot stove combustion apparatus using this as a fuel gas.

The present invention has been made to solve the problems of the conventional blast furnace top hopper equalization method, and its purpose is to provide blast furnace gas used for the equalization of one top hopper. The present invention provides a blast furnace hopper pressurizing device that prevents air pollution and environmental pollution by refilling and using a certain amount of pressure.

1 is a schematic view showing a pressurization device of a conventional charge hopper

Figure 2 is a schematic diagram showing a pressurizing device according to the present invention

Figure 3 is a schematic diagram showing the operating state of the pressurizing device of the present invention

4 is a hydraulic circuit diagram of a pressure valve according to the present invention.

Figure 5 is a schematic diagram showing an installation state of the pressurizing device according to the present invention

6 is a flowchart showing a control state of the pressurizing device according to the present invention.

Explanation of symbols on the main parts of the drawings

3 ... flap chute 4 ... upper seal valve

5 ... low seal valve 6 ... flow control valve

8 back pressure 9 nitrogen storage tank

10 ... Double acting hydraulic cylinder (flange supported)

15 ... piston rod 20 ... balance body

27 ... valve flange 31 ... Non-magnetic cylinder

30 ... Basic pressure detection device 32 ... piston made of magnetic material

70 ... Electro-hydraulic 3-position switching valve (spring center tank port block)

The technical configuration of the present invention by achieving the above object is that the two hoppers in the blast furnace equalization sequence can not enter the equalization pressure at the same time, and the equalization proceeds alternately, so that the gas used for pressurization of one hopper is atmospheric pressure It is used for refilling other top hoppers installed on the side of the state, by connecting two existing top hoppers and providing a pressure hopper for the hopper of the blast furnace which consists of a pressure equalization detection device attached to the pressure equalizing valve installed thereon.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

Figure 2 is a schematic diagram showing a pressurizing device according to the present invention, Figure 3 is a schematic diagram showing the operating state of the pressurizing device of the present invention, Figure 4 is a hydraulic circuit diagram of the pressure valve according to the present invention, Figure 5 is the present invention Figure 6 is a schematic diagram showing an installation state of the pressurizing device according to the present invention, Figure 6 is a flow chart showing the control state of the pressurizing device according to the present invention, the present invention, the pressure equalizing valve having two discs (Disc) acting as a hydraulic cylinder ( 80) and the equalization detecting device 30 is attached to the cylinder portion of the equalization piece 80 (see Fig. 2).

In addition, the pressure equalizing valve 80 has a structure in which the double acting hydraulic cylinder 10 is coupled to the pressure equalizing body 20 in a flange support type, and the front end of the piston rod 15 is provided. After the two valve discs (Valve Disc) (23) is fastened and threaded to be fixed by the disk fixing nut (24), the piston rod (15) operating part and the open external connection pipe to the gas leakage To prevent grease and dust penetration of the piston rod 15 by combining and sealing the packing materials 12, 22 and 28 to prevent grease from being supplied to the grease. Install nipple (21).

And, the end of the piston rod 15 is provided with a striker (50) for detecting the valve position, the non-contact limit switch (Non Tack) (51) (52) for detecting the operation state of the valve (Valve) (53) Three brackets are fitted to the double acting hydraulic cylinder (10) flange and are fitted to the valve operating stroke.

The connection of the external pipe for connecting the pressure equalizing valve body 20 and the furnace hopper shell is made by fastening the valve flange 27, and the double acting hydraulic cylinder 10 is an electrohydraulic three-position switching valve. It is connected to and operated (shown in FIG. 4) 70, and a hydraulic circuit for driving thereof is shown in FIG.

In addition, the pressure equalizing device 30 is composed of a cylinder 31 made of a small nonmagnetic material, a non-contact limit switch 33 attached to the center of the cylinder outer cylinder, and a piston 32 made of a magnetic material. A tube is connected to the pressure equalizing body 20 and a filter 34 is attached to prevent spectral and dust inflow into the cylinder 31.

The operation of the pressure equalizing valve 80 having the above configuration is performed by two valve discs 23 fastened to the piston rod 15 operated by the switching valve 70. Is done. (The purpose of using two discs is to get better sealing effect because the direction of breaking pressure is changed at every operation)

In addition, the pressure equalizing valve 80 is operated in three ways: NO.1 side closed, open, and NO.2 side closed according to a separately inputted pressurization sequence command, and completion is mounted at the end of the piston rod 50. It is detected by three non-contact limit switches 51, 52 and 53, and the result is fed back.

When the pressure equalizing valve 80 is opened, the pressurized gas is moved from the higher pressure (2.60kg / ㎠) to the lower foot (atmospheric pressure) (the volume of the hopper is 85 m 3, which is the same for both hoppers). In this way, the flow of refilled gas (Gas) in the pressure equalizing valve 80 is stopped and the pressure equalizing (complete pressure) is completed. The pressure equalizing detection is performed by the pressure equalizing device 30.

In addition, when the pressures of the two hoppers are the same (1.30kg / ㎠), the piston 32 is located at the center of the cylinder 31, and the non-contact limit switch 33 attached to the center operates the contact signal to complete the pressure equalization. It is sent to the control unit to proceed with the subsequent sequence.

When the equalization of both hoppers is completed, the hopper, which was in the first equalization state, starts the back pressure sequence and the hopper, which was the atmospheric pressure, starts the equalization sequence.

This operation is repeated every time the top hopper performs the equalization sequence.

According to the blast furnace charging hopper pressurization apparatus according to the present invention as described above, by reusing 1/2 of the filling gas during pressurization of the blast furnace hopper, as well as reducing the filling gas, reducing the amount of air dissipation to 1/2 air pollution and environmental pollution In this special case, the pressure hopper is used in the blast furnace hopper in the special case where the pressure direction is alternately changed when the valve is shut off. As well as reducing installation cost, it is possible to prevent troubles such as clogging or malfunction of the pressure pipe which may occur when installing a separate pressure transmitter, and thus it has an excellent effect of providing a stable blast furnace hopper pressurization device.

Claims (4)

In the hopper, The equalization valve body 20 which has two chambers which mutually open in the 1st, 2nd loading hopper 1a, 1b inside is connected as a flange, respectively, and the double-acting hydraulic cylinder ( 10) is coupled, the front end portion of the piston rod 15 of the hydraulic cylinder 10 is inserted into the pressure equalizing body 20, the two valve disks 23 are fastened, the packing so as to be in close contact with the external connection pipe opening Ash (12) (22) and (28) are respectively coupled to the rod, and the end of the piston rod (15) is provided with a striker (50) is installed to be connected to the non-contact limit switch (51) (52) (53) The crushing 80 Non-contact limit attached to the center of the cylinder outer cylinder and the cylinder 31 made of a small non-magnetic material is installed on the upper side of the pressure equalizing body 20 to be separated and connected to two rooms formed in the pressure equalizing body 20 A switch 33 and a piston 32 made of a magnetic material are installed, and a pressure equalizing device 30 is connected to the pressure equalizing body 20 by a copper tube. Top Hopper Pressurization Device According to claim 1, wherein the pressure equalizing body 20, the grease supply nipple (Nipple (21) that can be filled with grease from the outside to prevent lubrication and dust penetration of the piston rod 15 is installed) Furnace hopper pressurizing device, characterized in that The method of claim 1, wherein the double acting hydraulic cylinder 10 is coupled to one side of the pressure equalizing body 20, the electro-hydraulic three-position switching valve 70 is connected to the hopper hopper of the blast furnace, characterized in that The cylinder (31) of the pressure equalizing device (30) is characterized in that the filter (34) is attached to the inside of the fusion chamber to prevent spectroscopy and dust inflow into the cylinder (31). Blast furnace hopper pressurization device