KR100784148B1 - Stagnation layer removal device and removal method of a fluid reduction furnace - Google Patents

Abstract

The stagnation layer removal device of the flow reduction furnace according to the present invention is installed through the outer wall of the flow reduction furnace to remove the stagnation layer formed on the top of the dispersion plate, installed through the outer wall of the flow reduction furnace And a second gas injector for removing the stagnant layer formed on the lower portion of the dispersion plate and a third gas injector installed through the gas duct to remove the stagnant layer formed in the gas duct.

Description

Apparatus and method for removing stagnant bed in a fluid reduction furnace {APPARATUS AND METHOD FOR REMOVING STATIONARY BED OF FLUDIZED REDUCTION FURNACE}

1 is a schematic view showing an embodiment of a molten iron manufacturing apparatus.

Figure 2 is a schematic diagram of a flow reduction furnace equipped with a stagnation bed removal apparatus of the flow reduction furnace according to an embodiment of the present invention.

3 is a schematic view showing a first gas injector.

4 is a schematic view of a second gas injector.

The present invention relates to a method and an apparatus for removing a stagnation bed in a fluid reduction furnace. More specifically, the present invention relates to a stagnation layer of dust, spectroscopic and reduced-reduction iron, which is formed on a wall of a flow reduction furnace or a distribution plate by incomplete flow in a fluid reduction furnace. The present invention relates to a method and a device for removing a stagnation bed for removing a fluidized bed.

The steel industry is a key industry that supplies basic materials to the entire industry, such as automobiles, shipbuilding, home appliances, and construction, and is one of the oldest industries that has been with human development. Steel mills, which play a pivotal role in the steel industry, manufacture molten pig iron, molten pig iron, using iron ore and coal as raw materials, and then produce steel and supply it to each customer.

Currently, about 60% of the world's iron production comes from blast furnace methods developed since the 14th century. The blast furnace method is a method of producing molten iron by reducing iron ore to iron by putting together coke prepared from sintering process and coking coal as a raw material into a blast furnace.

The blast furnace method, which is a large-scale of molten iron production equipment, requires a raw material having a certain level or more of strength and a particle size capable of ensuring ventilation in the furnace because of its reaction characteristics. Depends on the coke processed specific raw coal, and as a source of iron mainly depends on the sintered ore through a series of agglomeration process.

As a result, the current blast furnace method necessarily involves preliminary treatment of raw materials such as coke production equipment and sintering equipment. Therefore, it is not only necessary to construct auxiliary equipment other than the blast furnace, but also to the environment for all environmental pollutants generated from the auxiliary equipment. Due to the need for the installation of pollution prevention equipment, there is a problem in that the cost of production is rapidly increased due to the large investment cost.

In order to solve the problems of the blast furnace method, steel mills around the world use molten coal as a fuel and a reducing agent directly, and as a source of iron, molten reduction of molten iron by directly using spectroscopy that occupies 80% or more of the world's ore production. Many efforts are being made in the development of the steelmaking method.

The melt reduction steelmaking method is mainly composed of two-stage reduction methods, preliminary reduction and final reduction. Conventional molten iron manufacturing apparatus is composed of a fluid reduction furnace in which a bubble fluidized bed is formed and a melt gasification furnace in which a coal packed bed is formed. Spectroscopy and subsidiary materials at room temperature are charged to a flow reduction furnace and preliminarily reduced.

Since the high temperature reducing gas is supplied from the melt gasification furnace to the fluid reduction furnace, the spectroscopy and subsidiary materials at room temperature are heated in contact with the high temperature reducing gas. At the same time, spectroscopy and secondary raw materials at room temperature are reduced by at least 90%, fired by at least 30% and charged into the melt gasifier.

On the other hand, in the flow reduction process, the spectroscopic charge into the flow reduction furnace is raised and reduced by the reducing gas supplied from the melt gasification furnace, which rises to a certain height depending on the characteristics of each particle size, density, etc. It descends again along the inner wall of the flow reduction furnace with little gas flow.

However, if the periphery of the reactor is not formed for a variety of reasons, such as sudden gas flow changes in the operation, the descending spectroscopy does not rise again and forms a layer between the bottom of the flow reduction furnace and the inner wall.

Thus, the layer formed between the lower part and the inner wall of a fluid reduction furnace is called a stagnation layer. In particular, when the operation instability continues or the impact of gas flow fluctuations is very large, the spectral forming the stagnant layer does not rise again, and disturbs the flow of spectral and gas in the flow reduction furnace.

The abnormal flow of spectral and gas formed by the stagnation layer further grows the stagnation layer, which in turn leads to a vicious cycle that further disturbs the flow of spectral and gas, greatly weakening the normal function of the flow reduction furnace.

Therefore, in order to remove the stagnation layer, the flow reduction process is stopped, the flow reduction furnace is cooled, and the manhole of the flow reduction furnace is opened, and then removed using a cleaning tool such as a shovel or a drag, a cleaning device, and the like. After that, the flow reduction furnace is heated again to increase the temperature and then operate.

This is called idle time, and after cooling it takes a considerable time to remove the cyclone of the flow reduction furnace, the stagnation layer of the upper and lower portions of the dispersion plate, the total downtime is very long. Therefore, the overall operation rate of the fluid reduction furnace is falling very much.

The present invention is to solve the above problems, an object of the present invention is to remove the stagnant bed of the flow reduction reactor during the operation or cooling process to re-fluidize, and then discharged to shorten the overall down time and operating rate of the flow reduction furnace The present invention provides a method and apparatus for removing a stagnation bed in a fluid reduction furnace capable of improving the efficiency of the reactor.

The stagnation layer removal device of the flow reduction furnace according to the present invention is installed through the outer wall of the flow reduction furnace to remove the stagnation layer formed on the top of the dispersion plate, installed through the outer wall of the flow reduction furnace And a second gas injector for removing the stagnant layer formed on the lower portion of the dispersion plate and a third gas injector installed through the gas duct to remove the stagnant layer formed in the gas duct.

The first gas injector is connected to a gas supply pipe and a gas supply pipe for supplying gas into the flow reduction furnace, and may include a nozzle head part for injecting gas. In addition, the first gas injector may further include a hydraulic cylinder to move the nozzle head.

The second gas injector may include an insertion tube fixed to an outer wall of the flow reduction furnace and an injection tube coupled to the insertion tube to inject gas into the flow reduction furnace. In addition, the insertion tube may include a ball valve disposed to the side coupled to the injection tube to open and close the insertion tube. In addition, the insertion tube may include a dust inflow prevention cap disposed inside the flow reduction furnace. The insertion tube may be arranged to inject gas in the downward direction of the flow reduction furnace.

The third gas injector is connected to a gas supply pipe and a gas supply pipe for supplying gas into the flow reduction furnace, and may include a nozzle head part for injecting gas. The third gas injector may further include a hydraulic cylinder for moving the nozzle head portion.

On the other hand, the stagnation bed removal method of the flow reduction furnace according to the present invention is the step of measuring the differential pressure between the upper and lower inside the flow reduction furnace, when the differential pressure is more than the predetermined value, using the stagnation bed removal device to convert the inert gas to the flow reduction furnace Spraying the stagnant layer formed therein.

Injecting an inert gas into the stagnation bed may occur during operation of the flow reduction furnace. In addition, the step of injecting the inert gas into the stagnation layer may be made during the cooling of the flow reduction furnace. In this case, the inert gas may be nitrogen gas.

Hereinafter, the present invention will be described in detail with reference to the attached drawings and the most preferred embodiment which can be easily carried out by those skilled in the art. These examples are merely to illustrate the invention, but the invention is not limited thereto.

Figure 1 is a schematic diagram showing an embodiment of a molten iron manufacturing apparatus 1000 that can be used to remove the stagnation layer and removal apparatus of the flow reduction furnace according to an embodiment of the present invention. The structure of the apparatus for manufacturing molten iron 1000 shown in FIG. 1 is merely for illustrating the present invention, and the present invention is not limited thereto. It is therefore possible to modify this to other structures and include other devices.

The molten iron manufacturing apparatus 1000 includes a flow reduction furnace 100, a melt gasifier 300, and a reduction gas supply pipe 400, which are reduction furnaces.

In addition, the molten iron manufacturing apparatus 1000 may further include a compacted material manufacturing apparatus 500 and a high temperature uniform pressure-reducing apparatus 600 connected between the flow reduction furnace 100 and the melt gasification furnace 300. In addition, the apparatus for manufacturing molten iron 1000 further includes various other apparatuses necessary for manufacturing molten iron.

The fluid reduction furnace 100 has a fluidized bed formed therein, and is sequentially connected to reduce the spectroscopic or the like of the fluidized bed and convert it into a reducing body. Each flow reduction furnace 100 receives the reducing gas discharged from the coal packed bed of the melt gasifier 300 through the reduction gas supply pipe 400. Flow reducing furnace 100 is converted to a reducing body by passing the spectroscopic and secondary raw materials while allowing the reducing gas to flow.

The flow reducing furnace 100 may be provided in plural, and in FIG. 1, for example, the preheating reduction furnace 100a, the first preliminary reduction furnace 100b, the second preliminary reduction furnace 100c and the final reduction furnace 100d A configuration consisting of) is shown.

The compacted material manufacturing apparatus 500 compacts a reducing body to ensure breathability and prevent scattering. The compacted material manufacturing apparatus 500 includes a charging hopper 520, a pair of rolls 540, a crusher 560, and a reducing tank 580. In addition, the compacted material manufacturing apparatus 500 may include other devices as necessary.

Charging hopper 520 stores a reduced body of the iron-containing mixture. The pair of rolls 540 is made of compacted compacts by compressing the reduced bodies. The shredder 560 breaks the compacted reduced material into an appropriate size. The reducing body storage tank 580 temporarily stores the crushed reducing body.

The high temperature uniform back pressure device 600 is located between the compacted material manufacturing apparatus 500 and the melt gasifier 300. The high temperature uniform back pressure device 600 is installed above the melt gasifier 300 for pressure control. Since the inside of the melt gasifier 300 is a high pressure, the high temperature equalization device 600 to uniformly adjust the pressure to easily charge the crushed reducing body into the melt gasifier 300.

The molten gasifier 300 is supplied with coal briquettes formed of lump coal or pulverized coal to form a coal packed layer. The lump coal or coal briquettes injected into the melt gasifier 300 is gasified by a pyrolysis reaction in an upper part of a coal packed bed and a combustion reaction by oxygen in a lower part. The high temperature reducing gas generated in the melt gasification furnace 300 by the gasification reaction is sequentially supplied to the flow reduction furnace 100 through a reducing gas supply pipe 400 connected to the rear end of the final reduction furnace 10d to reduce and fluidize. It is used as a gas.

As described above, as the molten iron manufacturing process is performed in the molten iron manufacturing apparatus 1000, a stagnation layer is formed in the flow reduction furnace 100. Hereinafter will be described in detail with respect to the stagnation layer removing apparatus according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a flow reduction furnace in which a stagnation layer removal apparatus according to an embodiment of the present invention is installed. The fluid reduction furnace 10 has a fluidized bed formed therein, and is sequentially connected to reduce the spectroscopic or the like of the fluidized bed and convert it into a reducing body. The flow reduction furnace 10 receives the reducing gas discharged from the coal packed bed of the melt gasifier.

The flow reduction furnace 10 converts the reducing gas into a reducing body by passing the spectroscopic and secondary raw materials while allowing the reducing gas to flow through the lower gas duct 40. In the flow reduction process, the flow reduction furnace 10 may be provided in plurality. The cyclone 20 is installed inside the flow reduction furnace to collect spectroscopy, and the dispersion plate 30 is disposed to disperse the reducing gas.

A first gas injector 110 is installed at an upper portion of the dispersion plate 30 of the flow reduction furnace to penetrate through an outer wall of the flow reduction furnace, and a second gas injector 120 is provided at a lower portion of the dispersion plate 30. Is installed, the third gas injector 130 is installed through the outer wall of the gas duct 40.

In each of the gas injectors 110, 120, 130 installed as described above, high-pressure nitrogen gas is injected during the operation or cooling of the flow reduction furnace 10 to remove the stagnant layer by dust and reduced iron.

In the flow reduction furnace 10 as described above, first, the fine particles stagnated inside the cyclone 20 are poured into the upper portion of the dispersion plate 30 by using the penetrating device 50 installed in the cyclone 20. Serve

Next, the first gas injector 110 and the second gas injector 120 inject a high-pressure inert gas into the stagnant layer formed on the fine powder, etc. poured from the cyclone 20 and the upper and lower portions of the dispersion plate 30. To fluidize

At this time, the high pressure inert gas may be injected while moving the nozzle head part back and forth and left and right through the motors provided in the first gas injector 110 and the second gas injector 120.

Next, the stagnant layer of the gas duct 40 is fluidized using the third gas injector 130. At this time, the fluidized stagnant layer is discharged to the outside through the dumping hole 60 formed on the distribution plate 30 together with the cooling gas or the reducing gas introduced into the gas duct 40. Therefore, the stagnation layer in the flow reduction furnace 10 is greatly reduced, the cleaning time of the stagnation layer by the operator is greatly reduced.

Hereinafter, the configuration of the stagnation layer removing device including each gas injection device will be described in detail.

3 is a schematic diagram of the first gas injector 110. As shown, the first gas injector 110 includes a gas supply pipe 112 and a nozzle head portion 114.

The first gas injector 110 is installed through the outer wall of the flow reduction furnace, and the flow nozzle head 114 is disposed inside the flow reduction furnace. The high pressure nitrogen gas supplied through the gas supply pipe 112 is injected from the nozzle head 114 to remove the stagnant layer formed on the upper part of the dispersion plate. At this time, the nitrogen gas may be injected at a pressure of approximately 10bar.

In addition, the first gas injector 110 is provided with a hydraulic cylinder 116, the nozzle head 114 is moved to the left or right or up and down direction by the hydraulic cylinder 116 to form a stagnant layer on the upper portion of the distribution plate (30). More effective removal. In FIG. 4, the nozzle head 114 is rotated by the hydraulic cylinder.

On the other hand, since the configuration of the third gas injector 130 installed in the gas duct 40 of the flow reduction furnace to remove the stagnant layer formed in the gas duct 40 is the same as the first gas injector 110 described above The detailed description thereof will be omitted.

4 is a schematic view showing that the insertion pipe 122 and the injection pipe 124 of the second gas injection device 120 are separated from each other. Hereinafter, the configuration of the second gas injector 120 will be described in detail.

The second gas injector 120 is installed through the outer wall of the flow reduction furnace to remove the stagnant layer formed under the distribution plate of the flow reduction furnace. The second gas injector 120 includes an insertion tube 122 that is fixedly installed through an outer wall of the flow reduction path and an injection tube 124 that can be separated and combined with the insertion tube 122.

A ball valve 122a is provided in an outward direction of the flow reduction path of the injection pipe 124. Accordingly, the ball valve 122a is closed when the stagnation layer removing device is not used, and the ball valve 122a is opened when the stagnation layer is removed by being combined with the insertion tube 122.

In addition, when the dust inflow prevention cap 122b is installed in the flow reduction path inner direction of the injection pipe 124 and no gas is injected, the dust or the reducing iron flows into the second gas injector 120 from the flow reduction furnace. Will be blocked.

When the injection pipe 124 is coupled to the insertion pipe 122, the ball valve 122a is opened, and the high pressure nitrogen gas is injected into the flow reduction furnace from the nozzle 124a of the injection pipe 124 to disperse the plate ( 30) Remove the lower stagnant layer.

On the other hand, the injection pipe 124 is mounted on the moving means 126 may be moved to the insertion pipe 122 installed in another portion of the flow reduction furnace. At this time, the insertion pipe 122 is installed in the downward direction of the flow reduction furnace nitrogen gas is injected to the bottom, the dust and reducing iron forming the stagnant layer is discharged through the gas duct installed in the lower portion of the flow reduction furnace.

Hereinafter, a method of removing the stagnation layer by using the stagnation layer removal device of the fluid reduction furnace described above will be described.

First, by using a pressure measuring sensor installed inside the flow reduction furnace, the differential pressure between the lower portion of the stagnation layer and the upper portion of the stagnation layer is not measured. At this time, when the differential pressure is more than a predetermined value, that is, when the stagnation layer is formed a predetermined amount or more, the stagnation layer removing device is operated. In the stagnant bed removing apparatus, the inert gas is injected into the stagnant layer formed inside the flow reduction furnace, and the stagnant layer is reflowed by the injection of the inert gas.

The reflowed stagnation bed is discharged to the outside of the flow reduction furnace by the reducing gas or cooling gas and removed.

The stagnation layer removal using the stagnation layer removal device as described above may be performed before the cleaning operation by the operator, that is, during the operation of the flow reduction furnace or during the cooling of the flow reduction furnace. Accordingly, the amount of stagnant layer to be removed by the operator is greatly reduced, thereby reducing the down time for removing the stagnant layer.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, according to the apparatus for removing a stagnation layer of the fluid reduction furnace of the present invention, by removing the stagnant layer formed by dust and reduced ore in the cooling process, the down time for removing it is greatly shortened, and accordingly, the flow reduction furnace By increasing the operation rate of the process efficiency can be obtained.

Claims (14)

In the stagnant layer removal apparatus of the flow reduction furnace for removing the stagnant layer formed in the flow reduction furnace having a gas duct connected to the lower portion, the dispersion plate for dispersing the reducing gas supplied through the gas duct in the inner side, A first gas injector installed through the outer wall of the flow reduction furnace to remove the stagnant layer formed on the dispersion plate; A second gas injector installed through the outer wall of the flow reduction furnace to remove the stagnant layer formed under the dispersion plate; and And a third gas injector disposed through the gas duct to remove the stagnant layer formed in the gas duct. According to claim 1, The first gas injector, A gas supply pipe for supplying gas into the flow reduction furnace, and The stagnant layer removal device of the flow reduction furnace connected to the gas supply pipe, comprising a nozzle head for injecting gas. The method of claim 2, The first gas injector further comprises a hydraulic cylinder for moving the nozzle head portion stagnation layer removal apparatus of the flow reduction furnace. According to claim 1, The second gas injector, Insertion pipe fixed to the outer wall of the flow reduction furnace, And The stagnant bed removal apparatus of the fluid reduction furnace comprising an injection pipe coupled to the insertion pipe for injecting gas into the flow reduction furnace. The method of claim 4, wherein The insertion pipe is disposed on the side coupled to the injection pipe is a stagnation layer removal device of the flow reduction furnace comprising a ball valve for opening and closing the insertion pipe. The method of claim 4, wherein The insertion pipe is a stagnation layer removal apparatus of the flow reduction furnace comprising a dust inlet prevention cap disposed inward of the flow reduction furnace. The method of claim 4, wherein The insertion tube is a stagnation layer removal device of the flow reduction furnace is arranged to inject gas in the downward direction of the flow reduction furnace. According to claim 1, The third gas injector, A gas supply pipe for supplying gas into the flow reduction furnace, and The stagnant layer removal device of the flow reduction furnace connected to the gas supply pipe, comprising a nozzle head for injecting gas. The method of claim 8, The third gas injector further comprises a hydraulic cylinder for moving the nozzle head portion stagnation layer removal apparatus of the flow reduction furnace. According to claim 1, And the first gas injector, the second gas injector, and the third gas injector inject nitrogen gas to remove the stagnant layer of the flow reduction furnace. Measuring the differential pressure between the upper part and the lower part in the flow reduction furnace, Injecting an inert gas into the stagnation layer formed inside the flow reduction furnace by using the stagnation layer removing apparatus according to claim 1 when the differential pressure is equal to or greater than a preset value; and Stagnation layer removal method of the fluid reduction furnace comprising a. The method of claim 11, wherein A method of removing a stagnation bed in a fluid reduction furnace, wherein the injecting the inert gas into the stagnation layer is performed during operation of the fluid reduction furnace. The method of claim 11, wherein A method of removing a stagnation bed in a fluid reduction furnace, wherein the step of injecting the inert gas into the stagnation layer occurs during cooling of the fluid reduction furnace. The method of claim 11, wherein And the inert gas is nitrogen gas.

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