KR200308386Y1 - An apparatus for protecting refractory layers in stand pipes between reactors of finex facilities - Google Patents

Abstract

The present invention prevents breakage of refractory and prolongs service life by preventing nitrogen gas from directly colliding with the refractory construction site when nitrogen purge is made to solve the clogging phenomenon and poor flow phenomenon of the ore flow tube. The present invention relates to an ore flow pipe refractory damage prevention device of a Finex flow path which is improved to ensure an operation stability of a Finex facility.

The present invention provides a device for protecting the refractory of a stand pipe of a Finex flow path from thermal deformation and impact caused by nitrogen purge, and opposing a nitrogen gas nozzle having a nitrogen purge inside the ore flow pipe. The damage prevention plate made of steel is integrally fixed to the inner surface of the ore flow tube to form a collision site of nitrogen gas, thereby preventing thermal deformation of the refractory caused by nitrogen gas and damage caused by impact. Provide ore flow pipe refractory damage prevention device.

Description

AN APPARATUS FOR PROTECTING REFRACTORY LAYERS IN STAND PIPES BETWEEN REACTORS OF FINEX FACILITIES}

The present invention relates to a device for protecting the refractory of a stand pipe of a Finex flow path from thermal deformation and impact caused by nitrogen purge. In order to solve this problem, when nitrogen purge is made in the inside, nitrogen gas does not directly collide with the refractory construction site to prevent breakage of the refractory material and to extend the service life of the FINEX facility to ensure the operational stability. It relates to an ore flow pipe refractory damage prevention device of a Finex flow path.

In general, the blast furnace method that has been the mainstream of the molten iron production equipment to date is limited in the characteristics of the raw material to use a raw material having a particle size that can secure a certain level of strength and in-vehicle breathability in the reactor and process characteristics.

As the fuel used in the blast furnace method and the carbon source used as the reducing agent, coke processed with specific raw coal is used, and as the molten iron source, the sintered ore which has undergone the aggregating process such as sintering and pelletizing, which is a pretreatment process, or Depends mainly on pellets.

Accordingly, the current blast furnace method must be accompanied by raw material pretreatment facilities such as coke manufacturing facilities, raw material coal, sintering facilities for the compaction of ores, and pelletizing facilities. The competitiveness of the current blast furnace method is rapidly being eroded by the enormous investment costs of environmental pollution prevention facilities to overcome global regulations on environmental pollutants generated from facilities.

In order to cope with the above situation, in the art, general coal is directly used as a fuel and a reducing agent, and as a molten iron source, a new steelmaking process is manufactured using molten iron ore, which occupies 80% or more of the world's ore production. Spurs on

In line with the global trend as described above, the art industry is developing a Finex facility 100, which is a fluidized bed reduction process that can use a powdered iron ore and coal using a fluidized bed, and the entire process is preheated, as shown in FIG. Four stage flow paths, such as the furnace 110a, the preliminary reduction furnace 110b, the intermediate reduction furnace 110c, and the last reduction furnace 110d, are equipped with the melt gasification furnace 120 etc. in which the coal filling layer is formed. .

As shown in FIG. 1 and FIG. 2, the hot reducing gas generated in the molten gasifier 120 is passed through the reducing gas conduit 125 to the final reducing furnace 110d, the intermediate reducing furnace 110c, and the reserve. It is sequentially supplied to the reduction furnace 110b and the preheating furnace 110a, and in the case of ore, the spectral ore quantified in the spectroscopic charging device 130 is preheated through the ore flow tube 105 and the preliminary reduction furnace 110a. 110b, the intermediate reduction furnace 110c, and the final reduction furnace 110d are supplied to the respective flow furnaces in the order opposite to the reducing gas.

That is, the spectroscopy at room temperature continuously charged to the uppermost flow path 110a is brought into contact with the high temperature reducing air stream supplied from the melt gasifier 120 while passing through the four-stage flow paths, thereby increasing the temperature and reduction of 90% or more. Converted into a high temperature reduced spectrometer

And, the spectroscopy passing through each flow path is supplied to the Corex reduction furnace 117 and the melt gasification furnace 120 of the lower side through the HCI manufacturing equipment 135, the reduction spectroscopy is formed of a coal packed layer The molten gasifier 120 is continuously charged into the molten gasifier 120 and is melted in the coal filling layer, thereby being converted into molten iron and discharged to the outside of the molten gasifier 120.

In addition, in the molten gasifier 120, the bulky coal is continuously supplied from the furnace top to form a coal filling layer having a constant height in the furnace, and a plurality of coal formed at the bottom of the outer wall of the filling layer into the filling layer. Oxygen is blown through the two air vents to burn coal in the coal packed bed, and the combustion gas is converted into a high temperature reducing air stream as it rises up the packed bed and discharged to the outside of the molten gasifier 120. Are supplied to the flow paths 110a, 110b, 110c, and 110d.

3 and 4 are views of the ore flow principle of the Finex flow path and the operation of the ball valve 140 of the ore flow pipe 105 to transfer the spectroscopic stones to the next flow path, the configuration of the ore flow pipe 105, and the refractory damage site. It is shown.

The ore flow pipe 105 is a pipe connecting the flow paths, and is divided into inliner construction sites 105a and 105c and irregular refractory construction sites 105b. As shown in the situation 1 of FIG. 3, the flow of the spectroscope shows a situation in which the spectroscope is flowing in the flow path more than a predetermined height, and some of the spectra are filled into the ore flow tube 105.

At this time, the filling pressure of the spectroscopy of the ore flow pipe 105 can be known by the differential pressure of the differential pressure gauges 107a, and the nitrogen gas of 10 Kg / cm 2 and 40 Kg / cm 2 periodically for preheating the refractory and the ball valve 140. Is purged into the ore flow tube 105. Thereafter, as shown in situation 2, the ball valve 140 is opened to transfer the spectroscopic stones to the next flow path. When the differential pressure of the differential pressure gauge 107b is lowered, the ball valve 140 is closed as in situation 3, and the ore flow pipe ( Wait for the spectroscopy to enter the interior of 105).

By repeating the operation as described above, when the spectral ore fluid layer having a predetermined height or more is formed in the next flow path, the subsequent ball valve 140 is opened and the ore flow pipe operation is performed.

On the other hand, if there is no ore flow due to ore flow defects and blockage of the ore flow tube 105, 10Kg / ㎠ low pressure nitrogen (150a) and 40Kg / ㎠ high-pressure nitrogen (150b) ore flow tube 105 Purge inside the () to improve the ore flow and eliminate clogging.

That is, in the ore flow tube 105, as shown in FIG. 5, nitrogen purge is performed, and the refractory 160 in front of the purge nozzle 152 is subjected to thermal deformation and impact by the nitrogen gas. It is severely damaged by.

As shown in FIG. 4, the internal structure of the ore flow tube 105 is divided into inliner mounting portions 105a and 105c made of SUS 310 STP material, and an irregular refractory construction portion 105b. In the case where the clogging phenomenon and the flow failure of the ore flow pipe 105 occur mainly, the site of purging the low pressure nitrogen 150a of 10 Kg / cm 2 and the high pressure nitrogen 150b of 40 Kg / cm 2 is the site where the irregular refractory 160 is constructed. In the case of the nitrogen purge, the refractory 160 is directly contacted with the refractory 160 during nitrogen purge, and the refractory 160 layer is thinned due to the occurrence of heat deformation due to refractory cooling and damage of the refractory caused by impact.

Therefore, the heat insulation capacity of the corresponding part is lowered, which causes serious problems such as the heat of the shell and the damage of the shell, which may cause a large-scale accident, as well as adversely affect the operation of the ore flow pipe 105 in the long term. There is nothing else.

Until now, this phenomenon is inevitable due to the characteristics of the process, and until now, efforts have been made to extend the operation time from the initial operation to the occurrence of damage of the refractory 160, and when the heat of the shell 162 due to the refractory damage is maintained, After stopping and cooling the damaged portion refractory 160 has been repaired and dried, and operation has been performed again.

Therefore, not only the instability of the operation but also a decrease in the work productivity due to the interruption of operation.

The present invention was devised to solve the above-mentioned conventional problems, and its purpose is to prevent the refractory damage caused by the heat deformation and the shock caused by refractory cooling generated when purging nitrogen gas to the refractory in the ore flow pipe of the flow path. Ore flow pipe of Finex flow path improved to prevent operation interruption due to refractory damage of ore flow pipe and to maintain stable operation to improve work productivity. It is to provide a refractory damage prevention device.

1 is a process flow diagram showing the overall process of a typical Finex installation;

2 is a schematic diagram of a flow path equipped in a typical Finex installation;

3 is an explanatory view showing the flow of ore in a flow furnace equipped in a general Finex installation;

4 is a detailed view of an ore flow tube equipped in a typical Finex installation;

5 is a detailed view of an ore flow tube equipped in a Finex installation according to the prior art;

6 is a perspective view showing a refractory damage prevention device of the ore flow tube according to the present invention;

7 is a detailed view showing a refractory damage preventing device of the ore flow tube according to the present invention, a) is a perspective view, b) is a sectional view;

8 is a detailed view of an ore flow tube equipped with a refractory damage preventing apparatus according to the present invention;

9 is a detailed operation of the ore flow tube equipped with a refractory damage prevention device according to the present invention, a) is a cross-sectional view perpendicular to the ore flow direction, b) is a cross-sectional view of the ore flow direction.

<Description of the symbols for the main parts of the drawings>

5 .... Support 10 .... Damage Plate

15 .... Refractory Fixture 100 .... Finex Fixtures

105 .... Ore flow pipe 110a .... Preheating furnace

110b ... preliminary reduction furnace 110c .... intermediate reduction furnace

110d ... Final Reduction Furnace 120 .... Melt Gasification Furnace

125 .. Reduced gas conduit 130 .... Spectroscopic charging device

135 .... HCI Manufacturing Equipment 150a ... Low Pressure Nitrogen

150b .... High Pressure Nitrogen 152 .... Purge Nozzle

160 .... refractory 162 .... shell

In order to achieve the above object, the present invention, in the apparatus for protecting the refractory of the ore flow pipe (Stand Pipe) of the Finex flow path from thermal deformation and impact by nitrogen purge, the inside of the ore flow pipe On the opposite side of the nitrogen gas nozzle in which the nitrogen purge occurs, the damage preventing plate made of steel is integrally fixed to the inner surface of the ore flow pipe to form a collision site of nitrogen gas, thereby causing the thermal deformation of the refractory caused by nitrogen gas and the impact caused by the impact. By providing an ore flow pipe refractory damage prevention device of the Finex flow path, characterized in that configured to prevent damage.

Hereinafter, with reference to the drawings will be described in more detail with respect to the present invention.

Ore flow pipe refractory damage prevention device (1) of the Finex flow path according to the present invention is fixed to the inner support bar (162) of the ore flow pipe 105 by a fixed height by welding, preventing damage to the upper portion After the plate 10 is installed, the irregular shape refractory 160 is constructed to support the lower part of the damage preventing plate 10 so as to prevent damage of the refractory 160 by nitrogen gas together with the refractory support. It is.

That is, the ore flow pipe refractory damage prevention device 1 of the Finex flow path according to the present invention is a support 5 to the inner surface of the ore flow pipe 105 to maintain the damage preventing plate 10 at a constant height The welding plate is fixed and the damage preventing plate 10 has the same curvature as the inner diameter curvature of the refractory 160 mounted inside the ore flow tube 105.

Therefore, as shown in Figure 9a) it is possible to move without resistance when moving the ore by making the same inner curvature of the refractory, it is possible to effectively reflect the nitrogen gas injected from the nozzle.

In addition, the damage preventing plate 10 is disposed to face the opposite side of the nitrogen gas purge nozzle 152 so that all of the nitrogen gas injected from the nozzle 152 collides with the damage preventing plate 10. will be.

The damage preventing plate 10 and the support 5 are made of SUS 310 STP material, so that when the nitrogen gas from the nitrogen gas purge nozzle 152 collides with the damage preventing plate 10, the impact and damage thereof are caused. Will be minimized.

Meanwhile, a plurality of refractory anchors 15 are formed on the lower surface of the damage preventing plate 10 in parallel with the support 5 to provide a firm coupling between the damage preventing plate 10 and the refractory 160. It is guaranteed. That is, conventionally, there was no means to support the amorphous refractory structurally weak, but in the present design a plurality of fasteners 15 protruding to the lower surface of the damage prevention plate 10 serves to secure the refractory to the steel structure more stable It is possible to maintain the amorphous refractory state.

The ore flow pipe refractory damage prevention apparatus 1 of the Finex flow path according to the present invention configured as described above is a low pressure nitrogen (150a) and 40Kg / ㎠ of 10Kg / ㎠ in the nitrogen purge nozzle 152 of the ore flow pipe 105 When the high pressure nitrogen (150b) of the purge is conventionally in direct contact with the surface of the refractory 160 caused a fatal damage to the refractory 160, but the contact portion on the damage prevention plate 10 installed on the front of the purge nozzle 152 The impact is offset and the nitrogen gas is dispersed to prevent the occurrence of thermal deformation of the surrounding refractory 160 and the refractory damage due to the impact.

In addition, when the refractory fixture 15 is installed for the purpose of preventing falling off due to poor support during construction of the irregular refractory construction, when the refractory 160 is cured in the state inserted into the refractory 160, the damage prevention plate 10 and the refractory 160 By integrally forming the damage preventing plate 10 can be supported up, down, left, right, and can increase the binding force of the refractory 160.

On the other hand, while the ore flow pipe refractory damage prevention device 1 of the Finex flow path according to the present invention is shown as a structure mounted inside the ore flow pipe 105, the present invention is not limited to this, Finex It is applied to all parts that need support of refractory 160 and all refractory construction sites where nitrogen gas is purged, such as a dump pipe of a facility, a pipe such as a riser for transporting high temperature spectroscopy, etc. This is of course possible to ensure the extension of the life of the refractory 160 and the stability of the equipment.

According to the present invention as described above, the ore flow tube (not hesitating to purge the nitrogen gas due to fear of refractory damage when clogging phenomenon and flow failure occurs ore flow tube 105) The operation of 105) was not performed smoothly, so unstable operation had to be performed, but through the present invention, active and rapid measures were made to enable stable operation of the ore flow pipe 105, thereby improving the facility utilization rate by extending the operation period of the furnace. Can be.

In addition, cost savings such as reduction of maintenance costs can be expected due to the reduction of maintenance work.

Claims (3)

In the apparatus for protecting the refractory 160 of the ore flow pipe (Fix) flow path of the ore flow path (Fix) (160) from nitrogen purge, The damage preventing plate 10 made of steel is integrally fixed to the inner surface of the ore flow tube 105 on the opposite side of the nitrogen gas nozzle 152 in which nitrogen purge is performed inside the ore flow tube 105. Preventing ore flow pipe refractory damage of the Finex flow path, characterized in that configured to prevent damage caused by thermal deformation and impact of the refractory 160 by nitrogen gas by forming a collision site. The ore flow tube refractory of claim 1, wherein the damage preventing plate 10 has the same curvature as the inner diameter curvature of the refractory 160 mounted inside the ore flow tube 105. Damage prevention device. The damage prevention plate 10 of claim 1, wherein a plurality of refractory fixtures 15 are formed on the lower surface of the damage preventing plate 10 in parallel with the support 5 for fixing it to the ore flow tube 105. Refractory damage prevention device of the ore flow pipe of the Finex flow path, characterized in that to ensure a solid combination of the refractory and ().