KR100431863B1 - Apparatus for cleaning dispersion plate in fluid-bed reducing furnace - Google Patents

Abstract

PURPOSE: An apparatus for cleaning a dispersion plate in a fluidized-bed reduction furnace is provided to improve an operating rate by efficiently preventing clogging of dispersion plate nozzles through which a reducing gas passes in the fluidized-bed reduction furnace. CONSTITUTION: In a dispersion plate(30) which is installed at the lower side of the inner part of a fluidized-bed reduction furnace(10) so as to uniformly eject a reducing gas from a melter gasifier(20), the apparatus for cleaning the dispersion plate in the fluidized-bed reduction furnace is characterized in that a cleaning member injecting pipe(40) is installed which is extended to the inside of each nozzles(32) of the dispersion plate(30) through iron skin and bricks of the fluidized-bed reduction furnace(10) so that the nozzles(32) of the dispersion plate(30) are cleaned using the cleaning member by supplying a high pressure of low pressure gas into the injecting pipe(40).

Description

Dispersion Plate Cleaning Device for Fluidized Bed Reduction Furnace {APPARATUS FOR CLEANING DISPERSION PLATE IN FLUID-BED REDUCING FURNACE}

The present invention relates to a fluidized bed reduction furnace (FLUID-BED REDUCING FURNACE). In detail, the nozzle portion of the dispersion plate installed in the preheating furnace, the preliminary reduction reactor and the final reduction furnace of the fluidized bed reduction furnace is blocked. The present invention relates to a dispersion plate cleaning apparatus of a fluidized-bed reduction furnace that enables the dispersion plate to be cleaned in advance to prevent the occurrence of water.

In general, up to now, the mainstream of molten iron production equipment is the blast furnace method. Such a blast furnace method uses only raw materials having a strength that is higher than a certain level and breathability in the furnace depending on the reactor and the process, and uses fuel. And as a carbon source to be used as a reducing agent, coke processed from specific raw coal should be used.

In addition, as an iron source, sinter ores or pellets that have undergone aggregation processes such as sintering and pelletizing, which are pretreatment processes, are mainly used. Raw material pretreatment facilities, such as gong facilities, are necessary, which is a problem that must be solved to increase the cost of the construction of the auxiliary equipment and to solve the environmental pollution problem in the auxiliary equipment.

Therefore, a new steelmaking process is being developed that uses plain coal directly as a fuel and a reducing agent, and uses ferrous iron ore directly as an iron source, which occupies more than 80% of the world's ore production, namely FLUID-BED REDUCING FURNACE. )to be.

Such a general fluidized-bed reduction furnace is shown in FIG. 1, but the fluidized-bed reduction furnace shown in FIG. 1 shows a process related to the Finex process.

As shown in FIG. 1, the entire process of the fluidized-bed reduction reactor includes a three-stage fluidized-bed reduction reactor 100 such as a preheating furnace 110, a preliminary reduction reactor 120, and a final reduction reactor 130. , Consisting of a portion of the melt gasification furnace 140 in which a coal packed bed is formed, the spectroscopy at room temperature continuously charged from the uppermost reduction furnace passes through the three-stage fluidized-bed reduction furnace 100 and the molten gasification furnace. By contacting with a high temperature reducing air stream supplied through the reducing gas pipe 170 at 140, the conversion is discharged to the high temperature reduction spectroscopy where the temperature rises and the reduction is 90% or more.

Such reduced spectroscopy is continuously charged into the molten gasifier 140 in which the coal filling layer is formed, melted in the coal filling layer, and converted into molten iron and discharged to the outside from the molten gasifier 140.

In addition, the molten gasifier 140 forms a coal filling layer having a constant height inside the furnace while continuously feeding the bulk coal from the upper portion of the furnace, and a plurality of the coal filling layers formed at the bottom of the outer wall of the filling layer into the filling layer. Oxygen is blown through the air outlet 150 to burn coal in the packed bed, and the combustion gas generated at this time is converted into a high temperature reducing gas while raising the packed bed, thereby allowing the fluidized bed reducing furnace 100 outside the molten gasifier 140 to be filled. Supplied to.

Next, FIG. 2 illustrates the fluidized bed reduction furnace 100 in detail as described above, and each fluidized bed reducing furnace 110, 120, 130 of the ore passing through the three-stage fluidized bed reduction furnace 100. ) Is moved through the conduit gain, ore flow conduit 160 connected to the corresponding and lower ends of the reduction furnaces, and in the conduit 160, the fluidized-bed reduction furnace 130 at the bottom due to the pressure difference between the upper and lower ends. ) So that the high-temperature reducing gas flow formed from the fluidized bed reduction furnace 110 at the top and the ore flow formed from the fluidized bed reduction furnace 130 at the lower end from the fluidized bed reduction reactor 110 at the top by gravity cross each other. Formed.

At this time, the three stages as described above, that is, the preheating furnace 110, the preliminary reduction furnace 120 and the high temperature reducing gas (gas) supplied to the fluidized-bed reduction furnace 100 of the final reduction furnace 130 in the melt gasification furnace ( The dust is scattered from 140 and tar by the ordinary coal, etc., and the high-temperature reducing gas reaches the fluidized-bed reduction furnace 100 to reduce the respective gas for uniform gas flow in the reduction furnace 100 Dispersion plates 200 in which dispersion nozzles 210 are installed are disposed below the furnaces 110, 120, and 130.

However, each of the dispersion plates 200 in the fluidized-bed reduction reactor 100 includes dust and tar in the reducing gas, and is supplied to the preheating furnace 110 and the preliminary reduction reactor 120 to be scattered. Iron ore is included, and thus, the dust, tar, and iron ore are aggregated in the dispersion plate nozzle 210 when passing through the dispersion plate 200, and when such a phenomenon is satisfied, the volume of the aggregation portion grows, eventually. This results in blocking the nozzle 210 of the distribution plate 200, in particular, the distribution plate nozzle 210 is clogged more easily because the upper portion is formed in a narrow cone.

Therefore, it is impossible to move the source gas through the fluidized-bed reduction furnace 100 or the like, which causes the operation to stop. In the past, although the process delays the clogging time of the nozzle 210 of the dispersion plate 200, Such clogging of the dispersion plate 200 could not be completely prevented.

As a result, the worker has taken out the dispersion plate 200 in the state in which the operation of the fluidized bed reduction furnace 100 is stopped, and then cleans it, and then proceeds with the operation again. there was.

The present invention has been made in order to improve the various problems as described above, the object of the present invention is to effectively prevent the nozzle of the distribution plate through which the reducing gas passes through the fluidized bed reduction, thereby preventing the operation of the fluidized bed reduction furnace It is to provide a dispersion plate cleaning apparatus for a fluidized bed reduction furnace to prevent the back and improve the operation rate.

In addition, another object of the present invention, by preventing the clogging of the dispersion plate with a simple structure, the production and installation of the dispersion plate cleaning device is easy, and if necessary, maintenance and maintenance of the dispersion plate in the fluidized bed reduction furnace is also easily performed It is to provide a cleaning apparatus.

1 is a schematic view showing a typical fluidized bed reduction furnace

Figure 2 is a schematic diagram showing the flow path structure of a conventional fluidized bed reduction furnace

3 (a) and 3 (b) are a perspective view of the main part and the internal structure showing the jet plate of the conventional fluidized bed reduction furnace

Figure 4a is an overall configuration showing the dispersion plate cleaning apparatus of the present invention fluidized bed reduction furnace

Figure 4b is a schematic diagram for explaining the operation by zone of the dispersion plate cleaning apparatus

5 is a main state diagram showing the dispersion plate cleaning operation by the dispersion plate cleaning apparatus of the present invention fluidized bed reduction furnace

Explanation of symbols on the main parts of the drawings

1 .... Reduction Furnace Cleaning Device 10 .... Reduction Furnace

20 .... Melting Furnace 30 .... Dispersion Plate

32 .... Nozzle 40 .... Cleaning member injection pipe

42 .... spray nozzle tip 44 .... annular tube

50 .... fine sand 52 .... sand storage hopper

60 ... gas supply pipe 70 ... pressure detector

80 ....

As a technical configuration for achieving the above object, the present invention is a dispersion plate which is installed to uniformly spray the reducing gas from the molten gasifier in the lower side of the fluidized bed reduction furnace, Fluidized bed reduction characterized in that it is equipped with a cleaning member injection tube extending to the inside of each nozzle of the distribution plate through the smoke and configured to clean the nozzle of the distribution plate as a cleaning member as a gas of high pressure or low pressure supplied to the injection tube. Dispersion Plate Cleaning Equipment

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4a is an overall configuration diagram showing the dispersion plate cleaning device of the fluidized bed reduction reactor of the present invention, Figure 4b is a schematic diagram for explaining the operation of each zone of the dispersion plate cleaning device, Figure 5 is a dispersion plate of the fluidized bed reduction reactor of the present invention It is a principal part state diagram which shows the dispersion plate cleaning operation by a cleaning apparatus.

4 and 5 shows a dispersion plate cleaning apparatus 1 of the fluidized bed reduction reactor of the present invention. First, the dispersion plate 30 is a preheating furnace 100a, a preliminary reduction reactor 100b, and a final reduction reactor ( It is installed to uniformly spray the reducing gas supplied from the molten gasifier 20 in the lower side of each of the three reduction stage 10 consisting of 100c).

In addition, a cleaning member injection tube 40 extending to the inside of each nozzle 32 of the dispersion plate 30 through the iron bar and the edge of the fluidized-bed reduction furnace 10 is provided with a high pressure or The nozzle 32 of the distribution plate 30 is installed as the cleaning member 50 as a gas of low pressure.

In addition, the cleaning member 50 is fine sand, the fine sand injection pipe 40 is connected to the gas pipe 60a, 60b for supplying high and low pressure nitrogen gas to the reduction furnace 10, the The sand storage hopper 52 for supplying the fine sand 50 through the gas pipe 60 is connected.

On the other hand, the fine sand injection pipe 40 is provided with an annular tube 44 to which a plurality of injection nozzle tips 42 located below each of the dispersion plate nozzle 32, the annular tube 44 ) Is mounted to the outside of the reduction furnace 100 in the lower portion of the distribution plate 30, the cleaning member injection nozzle 42 portion is installed through the iron shell and the edge of the reduction furnace (100).

In addition, a plurality of pressure detectors 70 are installed on upper and lower sides of the dispersion plate 30 of the reduction furnace 10 to detect a blockage of the dispersion plate nozzles 32, and each of the pressure detectors 50 is provided with the pressure detector 50. When the nozzles 32 of the distribution plate 30 are blocked by connecting the respective blocking valves 80a, 80b, 80c interposed between the gas pipe 60 and the storage hopper 52, the pressure difference is sensed to be fine as gas. It is made of a configuration that the sand 50 is sprayed to the dispersion plate nozzle (32).

Referring to the operation and effects of the present invention made in the above configuration in more detail as follows.

As shown in FIG. 4 and FIG. 5, the dispersion plate 30 installed in the fluidized-bed reduction furnace 10 and installed to uniformly supply the reducing gas reduced from the molten gasifier 20 into the reduction furnace 10 is provided. Dispersion plate cleaning of the fluidized-bed reduction furnace of the present invention, which is quickly blocked when it is blocked by dust, tar included in the reducing gas, and spectroscopic stones included in the spectroscopic feed flow, thereby preventing the operation of the reduction furnace 10 in advance. The apparatus 1 is as follows.

First, as shown in Figure 4, briefly look at the operation of the fluidized bed reduction furnace 10, the high temperature reducing gas generated in the molten reduction gas furnace 20 through the gas conduit at the bottom of the final reduction path (10) From the preheating furnace 10 through the preliminary reduction furnace 10 to the upper end of the preheating furnace 10, on the contrary, in the case of spectral ores, it is supplied from the preheating furnace to the final reduction furnace and discharged through the reduction furnace 10 to melt gasification. It is supplied to the furnace 20.

In this case, a distribution plate 30 having a plurality of nozzles 32 for uniformly distributing and supplying reducing gas to the inside of the fluidized-bed reduction furnace 10 is installed at an inner lower portion of each fluidized-bed reduction furnace 10. .

On the other hand, as shown in Figure 4 and 5, through the dispersion plate 30, dust and tar is contained, so that the various nozzles 32 of the dispersion plate 30 is blocked, the dispersion plate The pressure difference is generated in the reduction furnace 10 based on (30).

Therefore, when the pressure detected by the pressure detectors 70 on the upper and lower sides of the dispersion plate 30 installed in the reduction furnace 10 is approximately 50-100 mbar, the reducing gas is passed through the nozzle 32 of the dispersion plate 30. Indicates that it passes normally.

In this case, as described above, if the nozzle 32 of the dispersion plate 30 is blocked by dust or tar included in the reducing gas, the pressure detector 70 on the upper and lower sides of the dispersion plate 30 may have a maximum of 400 at 150 mbar. Differential pressure is generated up to mbar, in which case it is determined that the nozzle 32 of the distribution plate 30 is clogged, which is automatically shown as a control unit connected to the detector 70 although not shown in the figure.

Therefore, as shown in FIG. 4, when the differential pressure at the top and bottom of the dispersion plate 30 is 150 mbar, the pressure detector 70 is primarily a blocking valve installed in the low pressure nitrogen gas pipe 60a through the control unit. Operate 80a to supply nitrogen to the gas injection pipe 40 at a low pressure, that is, a low pressure of about 10 Kg / cm 2, and at the same time shut off the fine sand storage hopper 52 connected to the gas injection pipe 40. The side 80c is opened to supply the cleaning member, that is, the fine sand 50, to the gas injection pipe 40 together with the nitrogen gas.

At this time, the reason why the fine sand is used as the cleaning member 50 is that the clogged nozzle portion of the dispersion plate 30 can be easily cleaned, and the spectroscopic stones introduced into the SiO ₂ valorization reactor 100 which is the main component of sand and This is because it is used together as an auxiliary material.

As a result, as shown in Figures 3 and 4, from the annular pipe 44 provided below the distribution plate 30 through the iron shell 12 and the lead 14 of the reduction furnace 10 from the dispersion plate ( As the fine sand 50 is sprayed through the nozzle spray tip 42 extending to the lower portion of each nozzle 32 of 30, the cleaning operation of the dispersion plate nozzle 32 is performed.

Next, even when the nozzle cleaning operation of the dispersion plate 30 as the fine sand 50 through the low pressure nitrogen gas does not fall below 150 mbar, the control unit, although not shown in the drawings In the low pressure gas pipe (60a) of the blocking side (80a) is sealed and the high pressure, that is, the method of the same as at the low pressure by supplying the fine sand 50 while supplying a high pressure nitrogen gas of about 40 Kg / ㎠ to the gas pipe (40) Thus, the nozzle 32 of the dispersion plate 30 is completely cleaned again.

In particular, as shown in FIG. 4B, in the actual annular tube 44, as many nozzles 32 as the number of nozzles 32 of the dispersion plate 30, that is, about 37 to 42 nozzle injection tips 42 are provided for each nozzle 32. Since it is difficult to spray the fine sand 50 by supplying nitrogen gas of low pressure or high pressure, it is necessary to divide one annular tube 44 into four parts (AD) to the dispersion tube 40 if necessary. When the valves V1-V4 provided are opened and closed in stages to supply gas, the fine sand 50 is more reliably injected to the nozzles 32 of each zone of the distribution plate 30, thereby improving the cleaning efficiency.

As a result, the nozzle 32 of the dispersion plate 30 of the reduction furnace 10 is completely cleaned so that the reducing gas supplied from the molten reduction gas furnace 20 flows smoothly while forming a reducing gas stream.

Accordingly, in the present invention, the dispersion plate 30 is performed very quickly and without separate disassembly, compared to a conventional worker removing the dispersion plate 30 from the reduction furnace 10 to perform the fluidized bed reduction furnace 10. ), The operation rate is improved, and in particular, even during operation of the fluidized-bed reduction furnace 10, the cleaning operation of the dispersion plate 30 can be performed if necessary, which is more useful.

Thus, according to the dispersion plate cleaning apparatus of the fluidized bed reduction reactor of the present invention, by effectively preventing the nozzles of the dispersion plate through which the reducing gas passes in the fluidized bed reduction reactor, the operation rate is prevented by preventing the operation of the fluidized bed reduction furnace. This has the advantage of improving productivity.

In addition, by preventing the blockage of the dispersion plate with a simple structure, it is easy to manufacture and install the dispersion plate cleaning device, and if necessary, repair and maintenance work may be easily performed.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (4)

In the dispersion plate 30 is installed to uniformly spray the reducing gas from the melt gasifier 20 in the lower side of the fluidized bed reduction furnace 10, High pressure or low pressure supplied to the injection pipe 40 is provided with a cleaning member injection pipe 40 extending to the inside of each nozzle 32 of the distribution plate 30 through the iron bar and the edge of the fluidized bed reduction furnace 10 Dispersion plate cleaning apparatus for a fluidized bed reduction furnace, characterized in that configured to clean the nozzle 32 of the dispersion plate 30 as the cleaning member 50 as a gas of According to claim 1, wherein the cleaning member 50 is fine sand, the gas pipe (60a) (60b) for supplying nitrogen gas of high pressure and low pressure to the fine sand injection pipe (40) outside the reduction furnace 10 Is connected, and the sand storage hopper 52 for supplying the fine sand 50 passing through the gas pipe 60 is connected to the dispersion plate cleaning apparatus of the fluidized bed reduction furnace According to claim 1, wherein the injection pipe 40 is provided with an annular tube 44 to which a plurality of injection nozzle tips 42 located below each of the dispersion plate nozzle 32, the annular tube 44 is a dispersion plate cleaning apparatus of the fluidized bed reduction furnace, characterized in that mounted to the outside of the reduction furnace 10 below the dispersion plate 30. According to claim 1, A plurality of pressure detectors (70) for detecting the clogging of the dispersion plate nozzle 32 as a pressure difference on the upper and lower sides of the distribution plate 30 of the reduction furnace 10, The pressure detector 70 is connected to each of the blocking valves 80a, 80b, 80c interposed between the gas pipe 60 and the storage hopper 52 so that the nozzle 32 of the distribution plate 30 is blocked. Dispersion plate cleaning apparatus for a fluidized-bed reduction furnace, characterized in that configured to spray the fine sand 50 as a gas to the dispersion plate nozzle 32 by detecting the difference