KR100368287B1 - apparatus for additionally charging fine bearing materials in non-coking coal and fine ore based ironmaking process - Google Patents

Abstract

The present invention is a high temperature dust collecting tank (9) for collecting the fine ore discharged from the preheating furnace 4; A storage tank 10 connected to the high temperature dust collecting tank 9 and the first transfer conduit 11 and supplied with fine iron content, and supplemented with fine iron content through a transfer belt 13; The upper tank 21 and the upper opening 21 having the upper level switch 22 is connected in communication with the reservoir 10 and the second transfer conduit 17 via the upper tank 21 and the first opening / closing valve 24a. Is connected in communication with the first nitrogen gas pipe (29a), the gas discharge pipe (29c) is provided with a pressure equalizing tank (23), the pressure equalizing tank (23) and the second opening and closing valve (24b) through the A rotary extractor 28 connected in communication with the second nitrogen gas pipe 29b and having a lower level switch 26, which is opened and closed according to a signal of the weighing unit 27 which continuously measures the weight change. Balanced back pressure portion 20 composed of a lower tank 25 having; And a charging pipe (30) for guiding and supplying the fine ore discharged from the rotary extractor (28) into the third ore conduit (2a). To provide.

Description

Apparatus for additionally charging fine bearing materials in non-coking coal and fine ore based ironmaking process}

The present invention adds fine ore in the process of manufacturing molten iron using ordinary coal and iron ore which can increase the work productivity of the process by additionally loading fine iron content other than fine ore in the process of manufacturing molten iron using ordinary coal and iron ore. It relates to a charging device.

In general, the blast furnace method, which constitutes a large scale of molten iron production equipment, is limited to raw materials having a certain level of strength and granularity that can ensure furnace breathability due to the characteristics of the reactor. As an iron source, it mainly depends on sintered ores or pellets which have undergone aggregation processes such as sintering and pelletizing, which are pretreatment processes.

Accordingly, the present blast furnace method must be accompanied by raw material pretreatment equipment such as coke manufacturing equipment, raw material coal, sintering equipment for the hardening of ore, pelletizing equipment, etc. The competitiveness of the current blast furnace law is rapidly being eroded by the enormous investment costs for environ- mental pollution prevention facilities to overcome global regulations on environmental pollutants.

In order to cope with the above situation, countries around the world directly use general coal as fuel and reducing agent, and as a source of iron, develop new steel making process using molten iron ore, which accounts for more than 80% of the world's ore production. Spurs on

BACKGROUND OF THE INVENTION [0002] The apparatus for manufacturing molten iron using conventional coal and fine iron ore directly related to the above technology is disclosed in AT2096 / 92 patent pending in Austria.

According to the air technology, as shown in FIG. 1, a three-stage flow reduction reactor and a coal-filled bed including a preheating furnace 4, a preliminary reduction reactor 3, and a final reduction furnace 2 are formed. Consists of a molten gasifier (1), the iron ore (hereinafter referred to as spectroscopy) at room temperature continuously charged into the preheating furnace 4, which is the uppermost reactor, is referred to as the first, second and third ore conduits 4a. High temperature reducing gas supplied from the melt gasifier 1 through the first, second, and third gas pipes 2b, 3b, and 4b while sequentially passing through the three-stage flow reduction paths through (3a) and (2a). It is converted into a high-temperature reduction spectroscopy where the temperature rises and the reduction of more than 90% is carried out, and the reduced spectroscopy is continuously charged in the molten gasifier 1 in which the coal packed bed is formed and melted in the coal packed bed. As a result, it is converted into molten iron and discharged outside the molten gasifier 1.

In addition, in the melting gas furnace 1, the bulk coal is continuously supplied from the upper part of the furnace to form a coal filling layer having a constant height in the furnace, and through a plurality of air holes formed at the bottom of the outer wall of the filling layer. As oxygen is blown into the packed bed, coal is burned in the packed bed, and the combustion gas is converted into a high temperature reducing gas while rising the packed bed and discharged through the first gas pipe 2b of the molten gasifier 1. It is supplied to the three stages of the flow reduction reactor. In addition, the movement of each flow reaction period of the ore passing through the three-stage flow reduction path is characterized in that the ash 1,2 and three ore conduits (4a) (3a) (2a) connecting adjacent flow reduction paths of the upper and lower In the conduit (4a) (3a) (2a), the upper and lower flow by the high pressure reducing gas flow and gravity formed by the upper and lower flow reduction path by the pressure difference between the upper and lower ends Ore flows formed from the flow reduction to the lower flow reduction path is formed to cross each other.

On the other hand, the finely reduced reduced ore discharged continuously from the final reduction path (2) is discharged to the molten gasifier 1 side through the third ore conduit (2a), the discharged finely reduced reduced ore is the final reduction path (2) When the discharge position of the final reduction path (2) is low according to the height difference formed between the discharge position of and the upper position of the melt gasifier (1) of the high temperature reducing gas supplied to the flow stage of the three stages The gas is charged into the molten gasifier 1 by means of a portion of the gas, and when the final reduction path discharge position is high, the gas is charged into the molten gasifier 1 by the self-gravity of the differential reduction ore.

In the melting furnace charging method of the two kinds of reduced iron, the ore conduit is formed with a high temperature reducing air flow due to the introduction of a high temperature reducing gas, and when the charging conduit is additionally added to the finely divided iron-containing material, the iron-containing material The temperature is raised and partially reduced by the high temperature reducing air stream formed in the ore conduit, and also flows into the above-described reduced iron flow to be charged into the molten gasifier 1. According to the above, in the manufacturing process of molten iron using conventional coal and fine iron ore, the production amount may be increased by adding the fine iron-containing material, and as described above, the fine iron-containing material may be It is heated and partially reduced in the conduit and charged into the molten gasifier (1), thereby saving a substantial part of the energy required for the elevated temperature and complete reduction of the fine iron-containing material in the molten gasifier, thereby reducing the energy requirement compared to the production increase. This will ultimately increase the productivity of the process for producing molten iron using conventional coal and fine iron ore.

The present invention has been made to solve the above problems, the object of the present invention is to directly insert the fine iron-containing material into the ore conduit during the process of manufacturing molten iron using ordinary coal and iron ore directly work productivity of the molten iron manufacturing process The present invention aims to provide an additional charging device for fine ore in molten iron manufacturing equipment using ordinary coal and iron ore.

1 is a configuration diagram showing the molten iron manufacturing equipment employing the additional apparatus for adding a differential ore according to the present invention,

Figure 2 is a detailed view showing the connection structure of the charge pipe and the third ore conduit of the additional charge device for the differential ore according to the present invention,

3 is a graph showing the time required for the fine particle ore having a low particle size of 2 mm or less to be charged in a third ore conduit and then heated to an appropriate temperature by particle diameter;

FIG. 4 is a graph showing the reduction pattern formed while the fine ore passes through the third ore conduit. FIG.

Explanation of symbols on the main parts of the drawings

1 .... Melt Gasification Furnace 2 .... Final Reduction Furnace

3 .... preliminary reduction furnace 4 .... preheating furnace

9 .... High temperature collection tank 10 ... Storage tank

11 ... first transfer conduit 17 ... second transfer conduit

21 ... upper level 22, 26 ... upper and lower level switches

23 ... Equalization tank 24a, 24b ... 1st and 2nd open / close valve

25 ... Submount 27 .... Weighing Unit

29a, 29b ... nitrogen gas pipe 30 .... charging pipe

As a technical configuration for achieving the above object, the present invention

Preheating furnace into which the iron-iron ore flows, consisting of a three-stage flow reduction reactor consisting of a preliminary reduction reactor, a final reduction reactor, and a melt gasification furnace, the first and second flows of ore and reducing gas flow between the reactors In the facility for manufacturing molten iron having an ore conduit and the first, second and third gas pipes, and having a collecting device at the rear end of the preheating furnace,

A high temperature dust collecting tank for collecting the fine ore discharged from the preheating furnace;

A storage tank connected to the high temperature dust collection tank and the first transfer conduit, supplied with fine iron content, and supplemented with fine iron content through a transfer belt line;

It is connected via the reservoir and the second transfer conduit, and has an upper reservoir having an upper level switch, and is connected through the upper reservoir and the first opening and closing valve, the first nitrogen gas pipe, the gas discharge pipe is connected Equipped with a pressure equalizing tank, and the communication between the pressure equalizing tank and the second opening and closing valve, the second nitrogen gas pipe is connected, the lower level switch, the opening and closing in accordance with the signal of the weighing instrument to continuously measure the weight change Balanced back pressure portion consisting of a lower tank having a rotary extractor; And

The charging pipe for guiding and supplying the fine ore discharged from the rotary extractor into the third ore conduit; and by providing a fine ore additional charging device in the molten iron manufacturing equipment using ordinary coal and iron ore. .

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

1 is a block diagram showing a molten iron manufacturing equipment employing a fine powder ore additional charging device according to the present invention, Figure 2 shows a connection structure of the charging pipe and the third ore conduit of the fine ore additional charging device according to the present invention. As a detailed view, the apparatus 100 of the present invention, as shown in the drawing, guides the reduced iron ore reduced from the final reduction furnace to the molten gasifier side, and contains fine iron in the third ore conduit into which the reducing gas is upwardly guided. As an additional charge of the fine ore which is water, such a device is composed of a high temperature dust collection tank (9), a storage tank (10), a pressure equalizing unit (20) and a charging pipe (30).

That is, the high temperature dust collecting tank 9 is preheated to collect the fine ore discharged together with the reducing gas which has been reduced through the exhaust pipe 7 from the preheating furnace 4 into which the unreduced iron ore is first charged. It is installed between 4) and the collecting oscillator (5).

In addition, the storage tank 10 is collected inside the high temperature dust collecting tank 9 and the high temperature dust collecting tank 9 and the first transfer to be supplied with the fine powder ore extracted by the rotary extractor 9a installed at a lower portion thereof. It is connected in communication via a conduit (11), the storage tank (10) is connected to the conveying belt line (13) to receive another fine iron-containing material in addition to the fine ore collected in the high temperature dust collection tank (9) In the lower part, the rotary extractor 16 is configured to supply the stored differential powder to the upper tank side described later.

Here, the fine ore transported through the conveying belt line 13 is heated and reduced in a short time of about 1 to 2 minutes required to be charged into the melt gasifier 1 through the third ore conduit 2a. It is preferable to use iron ore and steelmaking dust having a low particle size of not more than 2mm.

In addition, in the reservoir 10, a dust collector 15 is installed to collect dust generated during the supply of fine ore through the first transport conduit 11 and the transport belt line 13, and clean dust is collected after the dust collection. It discharges to the atmosphere through the discharge pipe 15a.

In addition, the pressure equalizing portion 20 provided between the storage tank 10 and the third ore conduit 2a is composed of an upper tank 21, a pressure equalizing tank 23 and a lower tank 25, such an upper tank 21 is connected to the reservoir 10 via the second transfer conduit 17 so as to receive the fine ore stored in the reservoir 10, and the highest level of the differential ore stored in the inner space. The upper level switch 22 is installed to detect and control the ore flow.

Here, the upper level switch 22 is electrically connected thereto to control the operation of the rotary extractor 16 of the reservoir (10).

And, the equalization tank 23 is connected in communication via the connecting pipe having the upper tank 21 and the first opening and closing valve 24a from the upper tank 21 when the first opening and closing valve 24a is opened. An accommodating member having a predetermined size of internal space in which the fine ore is stored, and an outer surface thereof has a gas filled therein so as to convert the empty space in the high pressure state into the atmospheric pressure when the fine ore is loaded from the upper tank 21. While the gas discharge pipe 29c discharged to the outside is connected, the same pressure as the lower tank 25 is supplied to the inner space in which the fine powder is filled before supplying the differential powder filled therein to the lower tank 25. The first nitrogen gas pipe (29a) for supplying nitrogen gas from the outside so as to pressurize with is configured.

In addition, the lower tank 25 is connected in communication via the connecting pipe having the equalization tank 23 and the second opening and closing valve 24b is the bacteria under the same internal pressure condition when the second opening and closing valve 24b is opened. It is an accommodating member having a predetermined size of internal space in which the differential ore in the pressure tank 23 is stored, and has a lower level switch 26 so as to detect the set highest level of the amount of the charged ore stored therein. While equipped with a weighing device 27 for measuring the weight of the differential ore to be at any time, while the pressure in the lower tank 25 is slightly higher than the pressure in the third ore conduit (2a) on the outer surface of the third ore conduit ( A second nitrogen gas piping 29b for pressurizing the inside for supplying nitrogen gas is provided to prevent the inflow of reducing gas from 2a).

In addition, the charging pipe 30 connecting between the lower tank 25 and the third ore conduit 2a is quantitatively extracted from the rotary extractor 28 by a signal of a weighing instrument installed in the lower tank 25. It is a pipe member for guiding and supplying fine ore to the third ore conduit (2a).

The charging pipe 30 is made of a heat-resistant steel material having excellent heat resistance, and a branch reducing portion flowing inside the ore conduit 2a at a tip portion inserted into a depth of 1/3 to 2/3 of the diameter of the third ore conduit 2a. It is formed to be inclined to prevent the ore flow is introduced into the charging pipe (30).

The operation and effects of the present invention having the configuration as described above will be described.

In the process of manufacturing molten iron in the molten iron manufacturing equipment consisting of a three-stage flow reduction furnace (1) consisting of a preheating furnace (4), a preliminary reduction furnace (3) and a final reduction furnace (2), In the discharge pipe 7 of the preheating furnace 4, fine ore is scattered and discharged together with the reducing gas exhausted after the reduction operation. The fine ore is installed in the discharge pipe 7 before being supplied to the collector 5 side. The fine ore is collected while passing through the high temperature dust collecting tank 9, and the filtered exhaust air is exhausted to the collector dust collector 5 side.

Further, the fine dust ore is gradually accumulated in the high temperature dust collecting tank 9, and the accumulated fine ore is extracted by the rotary extractor 9a mounted to the lower portion of the high temperature dust collecting tank 9, so that the first transfer conduit 11 Is transferred to the storage tank 10 side and stored therein, and in addition to the fine ore of the high temperature dust collection tank 9, the fine storage iron 10 has a low particle size of 2 mm or less. Another fine ore is stored. At this time, the dust generated in the fine ore is collected by the dust collector (15) installed in the reservoir (10).

Subsequently, when a sufficient amount of fine ore is stored in the reservoir 10, the dust ore extracted by the rotary cutting machine 16 mounted to the lower portion of the reservoir 10 is transferred through the second transfer conduit 17. It is charged into the inner space of the upper tank 21 of the pressure equalizing unit 20.

Then, in the state where the first opening / closing valve 24a provided between the upper tank 21 and the equalization tank 23 is fed off, the supply of fine ore into the upper tank 21 is provided at an upper level set at a predetermined height. It continues until the detection signal of the switch 22 is generated, and when it is detected that the differential ore is sufficiently filled, the operation of the rotary extruder 16 of the reservoir 10 is stopped by the signal and the supply of the minute ore is stopped.

Subsequently, in the equalization tank 23, a valve member (not shown) installed in the gas discharge pipe 29c is opened to discharge the fine ore into the internal space, thereby discharging the internal residual gas, and thereby discharging the internal residual gas. The on-off valve 24a is opened to store all of the differential ore stored in the upper tank 21 into the pressure equalizing tank 23. At this time, the second opening and closing valve 24b between the equalization tank 23 and the lower tank 25 is in a closed state.

When the inside of the pressure equalizing tank 23 is filled with finely divided ore, the valve member and the first opening / closing valve 24a of the gas discharge pipe 29c which are open are closed to seal the internal space of the pressure equalizing tank 23.

In this state, the valve member (not shown) of the first nitrogen gas pipe 29a provided on the outer surface of the pressure equalizing tank 23 is opened, so that the pressure in the pressure equalizing tank 23 is equal to that of the third ore conduit 2a. It supplies a high pressure nitrogen gas until it is equal to the internal pressure of the lower tank 25, which compares the measured pressure with a pressure gauge that measures the pressure between the pressure equalizing tank 23 and the lower tank 25. It is judged by a differential pressure gauge.

Second opening / closing valve 24b provided between the equalization tank 23 and the lower tank 25 at the time when the internal pressure between the equalization tank 23 and the lower tank 25 is equal to each other is formed. A lower level switch 26 installed therein to supply fine powder ore in the pressure equalizing tank 23 to the lower tank 25 by its own weight, and a low water level of the fine powder stored in the lower tank 25 is installed therein. Is detected, the second open / close valve 24b is closed by the detection signal.

The process of charging the fine ore into the lower tank 25 in such a uniform back pressure state is that the above-mentioned series of equal back pressure charging process is performed when the amount of the fine powder stored in the lower tank 25 falls below the lower level switch 26. Because it is made repeatedly it is possible to maintain a certain amount of fine ore stored in the lower tank 25 at all times.

On the other hand, the lower tank 25 is connected to the third ore conduit (2a) is reduced supply of reduced ore reduced by the reducing gas via the charging pipe 30, the partial supply gas is supplied upward, The dust ore in the lower tank 25 is quantitatively extracted by the interlocking operation of the weighing machine 27 and the rotary extractor 28, and the extracted fine ore is charged into the charging tube 30 to the differential reduction ore flow. As it is introduced, the temperature is raised and partially reduced, and the molten gasifier 1 is charged into the furnace.

Pressurizing agent to prevent the reducing gas flowing in the third ore conduit 2a from flowing back into the lower trough 25 when the fine ore is introduced into the third ore conduit 2a from the lower trough 25 as described above. The valve member of the nitrogen gas pipe 29b is opened to maintain the internal pressure of the lower tub 25 slightly higher than the internal pressure of the third ore conduit 2a.

The amount of dust ore quantitatively extracted from the lower tank 25 and charged into the charging pipe 30 is such that the preheating furnace 4 can prevent excessive degradation of the temperature and the reducing atmosphere in the third ore conduit 2a. It is desirable to limit to within 10% of the iron ore charged into.

FIG. 3 is a graph showing the time required for fine powder ore having a low particle size of 2 mm or less to be charged in a third ore conduit and then heated to an appropriate temperature by particle diameter, and the temperature is completed within about 20 seconds. have. FIG. 4 is a graph showing the reduction pattern formed by the fine ore passing through the third ore conduit, and the reduction degree slightly decreases with the oxidation degree of the high temperature reducing gas passing through the third ore conduit 2a. However, it shows that partial reduction is made up to about 40% or more.

According to the present invention having the above-described configuration, in the process of manufacturing molten iron using direct coal and powdered iron ore, finely divided ore is added to the ore conduit connecting the final reduction furnace and the molten gas furnace. Since the temperature is raised and partially reduced before being charged into the gas melting furnace, the productivity can be increased by minimizing the amount of energy required to manufacture fine ore into molten iron, thereby improving the work productivity of the molten iron manufacturing process. Lose.

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 clarify that knowledge is easy to know.

Claims (4)

It consists of a three-stage flow reduction reactor consisting of a preheating furnace (4), a preliminary reduction furnace (3), a final reduction furnace (2), and a melt gasification furnace (1) into which the iron ore flows, and the reactor (4) ( 3) First and second or third ore conduits 4a, 3a and 2a and second and third and second gas piping 2b and 3b in which the flow of ore and reducing gas flows between (2) and (1). In (4b), the equipment for producing molten iron in the rear end of the preheating furnace (4), collecting collector (5), A high temperature dust collecting tank 9 for collecting the finely divided ore discharged from the preheating furnace 4; A storage tank 10 connected to the high temperature dust collecting tank 9 and the first transfer conduit 11 and supplied with fine iron content, and supplemented with fine iron content through a transfer belt 13; The upper tank 21 and the upper opening 21 having the upper level switch 22 is connected in communication with the reservoir 10 and the second transfer conduit 17 via the upper tank 21 and the first opening / closing valve 24a. Is connected in communication with the first nitrogen gas pipe (29a), the gas discharge pipe (29c) is provided with a pressure equalizing tank (23), the pressure equalizing tank (23) and the second opening and closing valve (24b) through the A rotary extractor 28 connected in communication with the second nitrogen gas pipe 29b and having a lower level switch 26, which is opened and closed according to a signal of the weighing unit 27 which continuously measures the weight change. Balanced back pressure portion 20 composed of a lower tank 25 having; And Charged pipe 30 for guiding and supplying the fine ore discharged from the rotary extractor 28 into the third ore conduit 2a; Additional charging device. The method of claim 1, The fine ore has a low particle size of 2 mm or less so that the temperature can be raised and reduced in a short time of 1 to 2 minutes required to be charged into the melt gasifier 1 through the third ore conduit 2a. Apparatus for the additional charge of fine ore in molten iron manufacturing equipment using ordinary coal and iron ore. The method of claim 1, The tip end of the charging pipe 30 is inserted to a depth of 1/3 to 2/3 of the diameter of the third ore conduit 2a so that the ring-reducing ore flow flowing inside the ore conduit 2a is charged to the charging pipe 30. Apparatus for the additional charge of fine ore in the molten iron manufacturing equipment using ordinary coal and iron ore characterized in that the inclined to prevent the flow into the interior. The method of claim 1, The amount of dust ore charged into the charging pipe 30 is controlled within 10% of the iron ore charged into the preheating furnace 4 so as to prevent excessive degradation of the temperature and the reducing atmosphere in the third ore conduit 2a. Apparatus for additional charge of fine ore in molten iron manufacturing equipment using ordinary coal and iron ore.