KR100435443B1 - Byproduct sludge recycling apparatus in ironmaking system - Google Patents

Abstract

In the molten iron manufacturing equipment that uses ordinary coal and iron ore for direct furnace operation without powder treatment, by-product sludge which is a by-product sludge produced by water treatment of flue gas is powdered and re-injected into the fluidized-bed reactor to recycle by-product sludge. One by-product sludge recycling unit is provided.

The by-product sludge recycling apparatus 1 is an exhaust gas pipe 14 in the molten gasifier 40 of the molten gasifier (40) connected through the flow reduction path (10) (20) (30) and the hardened reduced iron manufacturing machine (50). Sludge powder production apparatus 120 for producing by-product sludge discharged from the process water processor (70) for processing the process water of the collecting dust collector (60) connected to the sludge powder; and storing the produced sludge powder Sludge powder storage device (160, 160a); and sludge powder supply device for supplying the sludge powder discharged from the storage device to each of the distributors (210a, 210b) through the air supply conduit (200a, 200b) (190a); and each of the distributor 210 and the sludge powder injection conduit (300, 400) for blowing the treated sludge powder is connected between each of the final reduction path 30 and the preheating furnace (10), respectively It consists of the configuration.

Therefore, according to the present invention, while reducing the discharge of the final sludge discharged during the molten iron manufacturing process, while reducing the treatment cost according to the post-treatment process of the sludge provides an effect of improving the productivity of the molten iron manufacturing process.

Description

By-product sludge recycling apparatus of molten iron manufacturing equipment {BYPRODUCT SLUDGE RECYCLING APPARATUS IN IRONMAKING SYSTEM}

The present invention relates to a molten iron manufacturing equipment for producing molten iron by directly using ordinary coal and iron ore without additional treatment, and more specifically, by-product from the process water generated during the exhaust gas collection process during operation of the molten iron manufacturing equipment. It is possible to recycle the iron and moisture sludge that is used in the facility itself, thereby reducing the final sludge emission of the molten iron manufacturing facility and the processing cost due to the sludge treatment, while improving the productivity of the molten iron manufacturing facility that manufactures molten iron. The present invention relates to a by-product sludge recycling apparatus.

In general, the blast furnace method, which is a large-scale type of molten iron manufacturing equipment, has a certain level of strength due to the characteristics of the reactor, and requires a raw material having a particle size that can ensure the ventilation of the furnace. As a carbon source used as a fuel and a reducing agent, It relies on COKE, which has processed most of the raw coal, and mainly relies on sintered ore which has undergone a series of hardening processes as an iron source.

Therefore, the currently commonly used blast furnace method using the above coke and sintered ore is a necessity of the raw material pretreatment equipment such as coke manufacturing equipment and sintering equipment, the construction of the equipment and a huge cost to maintain it, In addition to the continuous maintenance and maintenance work, additional environmental pollution prevention facilities are needed to avoid the regulation of environmental pollution around the facility.In the end, the blast furnace method, which is mainly used, has a huge production cost and weakened its competitiveness. It's happening.

On the other hand, in order to avoid pretreatment of raw materials for the production of coke and sintered ore, general coal is directly used as a fuel and reducing agent, and iron iron ore which directly accounts for 80% of the world's ore production is used as iron source. The research of a new blast furnace method for producing a blast furnace has been in progress, a molten iron manufacturing equipment using such coal and iron ore directly is known from US Patent No. 5,534,046.

That is, as shown in Figure 1, according to the conventional molten iron manufacturing process known in the US patent, etc., the flow reduction path of the three-stage structure of the preheating furnace 10, preliminary reduction path 20 and the final reduction path 30 Field and coal-filled bed are formed in the melt gasifier 40, the room temperature spectroscopy continuously charged through the ore conduit 12 from the uppermost reactor (not shown) is the three-stage flow reduction After passing through the furnace 10, 20, 30 sequentially, the molten gasifier 40 is supplied.

In addition, by contacting with a high-temperature reducing air flow through the three stages of the flow reduction path (10, 20, 30) sequentially converted to high-temperature reduction spectroscopy at a temperature of 90% or more reduction is discharged, the reduction spectroscopy Is continuously charged into the molten gasifier 40 in which the coal packed layer is formed and melted in the coal packed layer of the molten gasifier 40, thereby converting to molten iron and discharged to the outside of the molten gasifier 40.

In the molten gasifier 40, the bulk coal is continuously supplied from the furnace upper part to form a coal filling layer having a constant height in the furnace, and formed in the coal filling layer below the outer wall of the filling layer. Oxygen is blown through the plurality of wind holes, and coal in the coal packed bed is burned.

At this time, the combustion gas generated by the combustion of the coal is discharged to the outside of the molten gasifier 40 in the state of being converted into a high temperature reducing air flow while rising through the packed bed, part of the reducing gas pipe 44, 34 ( 24 is supplied to the three stages of the flow reduction reactor (10, 20, 30), a part of the reducing gas pipe 44 and the preheating furnace to maintain a constant pressure applied to the melt gasifier (40) Through dust collectors 60a and 60b to which the exhaust gas pipe 14 of (10) is connected, dust is collected as process water and discharged to the outside.

That is, the final flue gas and the flue gas for the pressure control of the melt gasifier 40 through the three stages of the flow reduction path (10, 20, 30) is passed through the exhaust gas pipes (14) and the collector (60a, 60b) While passing through, the containing dust is removed in contact with the process water continuously supplied to the collector, and then cooled and separated from the process water and discharged, while separated from the gas from the collector (60a) (60b) The discharged process water passes through the water treatment unit 70 through the process water pipes 62a and 62b, and the process water from which dust is included is circulated and reused.

In addition, the movement of the ore passing through the three-stage flow reduction path (10, 20, 30) is through the ore conduit (22, 32, 42) connected to each other at the upper and lower ends between the reduction furnaces In the ore conduit, due to the pressure difference between the upper and lower ends, the high pressure reducing gas flow formed from the lower flow reducing path to the upper flow reducing path and the gravity flow reducing path from the upper flow reduction (10) to the lower flow reduction Ore flows formed by the furnace 30 cross each other.

On the other hand, as a method of charging the reduced reduction iron discharged from the final reduction path 30 into the melt gasifier 40, the high temperature reduction supplied to the three stages of the flow reduction reactor (10) (20) (30) Part of the gas is transported to the molten gasifier 40 by using a transport gas, and then charged, and the high temperature hardened reduced iron (HBI, Hot Brick Iron) provided on the last ore conduit 42 ) As a manufacturing machine 50, there is a method of manufacturing the compacted reduced iron and transfer it to the molten gasifier 40 using a separate transfer facility, the present method using the compacted reduced iron maker (50) Is being applied.

And, in the process of manufacturing molten iron by the three stages of the flow reduction path (10, 20, 30) of the fluidized bed formed on the inner gas dispersion plate of each of the reduction furnace (10, 20, 30) ( When the temperature of T) of FIG. 3 is maintained at an appropriate level, the reduction rate of the reduced-reduced iron discharged from the final reduction reactor 30 can be maintained at 85% or more, and in particular, the temperature of the preheating furnace 10 is controlled at a temperature of 680-700 ° C. It is known that the most preferable.

In other words, a method of controlling the fluidized bed T temperature in the reduction furnaces 10, 20 and 30 is known to maintain the reduction rate of the reduced reduction iron discharged from the final reduction reactor 30 as described above. For example, Japanese Patent Laid-Open No. 8-337806, Japanese Patent Laid-Open No. Hei 10-280021, and the like are disclosed.

On the other hand, as shown in Figure 1, by blowing the oxidant in the fluidized bed formed in the preheating furnace 10 to burn a portion of the reducing gas flowing into the fluidized bed, the temperature of the preheating furnace 10 is fixed The temperature of the fluidized bed in the preheating furnace 10 was controlled by the oxidant blowing conduit 16 for blowing the oxidant into the preheating furnace 10.

In addition, in the molten iron manufacturing equipment as described above, it occurs when the equipment is operated by the differentiation of the normal coal in the molten gasifier (40) and the powdered iron ore in the three-stage flow reduction path (10) (20) (30). Since a large amount of dust is contained in the gas, the waste water is collected as a by-product of the water processor 70 which processes the process water for treating it while the exhaust gas is collected while passing through the collectors 60a and 60b. A large amount of sludge is generated, and this sludge is by-produced at about 200 tons per day based on a 2000-ton daily plant.

On the other hand, such by-product sludge contains a large amount of carbon (carbon), iron (T. Fe) and ash (Ash) as shown in Table 1 below.

Sludge Composition Ratio (Dry Base) division Iron component (T. Fe) Carbon Ash (Ash) Content rate (%) 24.7 38.2 38.1

However, up to 90% of the by-product sludge produced during the operation of the molten iron-making plant is landfilled, so the treatment cost for treating such by-product sludge is considerable, and the problem of environmental pollution due to the sludge increases. In particular, the recycling of the carbon and iron components contained in the sludge in a large amount, despite the cost saving effect, almost all of the situation is disposed of.

The present invention has been made in order to solve the conventional problems as described above, the object is that the by-produced from the process water used in the exhaust gas dust collector in the molten iron manufacturing equipment that uses the ordinary coal and iron ore directly without additional treatment By powdering the sludge and injecting it into the reduction furnace, the productivity of molten iron manufacturing equipment is increased, and the amount of sludge produced is reduced to reduce post-treatment costs such as landfilling of sludge, and a large amount of carbon contained in the sludge. It is to provide a by-product sludge recycling apparatus of molten iron manufacturing equipment to reduce the cost of equipment maintenance by reusing components and iron components.

1 is a process chart showing a molten iron manufacturing process using ordinary coal and iron ore

Figure 2 is a process diagram showing the molten iron manufacturing equipment using a coal and fine iron ore including the first by-product sludge recycling apparatus as an embodiment according to the present invention

3 is a view illustrating a connection structure between a blown conduit of a first by-product sludge recycling apparatus of the present invention and a final reduction path of molten iron manufacturing equipment,

(a) a plan view

(b) the

Figure 4 is a process diagram showing the molten iron manufacturing equipment using the coal and the iron ore including the second by-product sludge recycling apparatus as another embodiment of the present invention

5 is a main view showing the connection structure between the blowing conduit of the second by-product sludge recycling apparatus of the present invention and the oxidant blowing conduit installed in the preheating furnace of the molten iron manufacturing equipment;

6 is a graph showing the combustion test results of the sludge powder according to the second by-product sludge recycling apparatus of the present invention

FIG. 7 is a flow chart illustrating molten iron manufacturing equipment using ordinary coal and fine iron ore including a third by-product sludge recycling apparatus as another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10,20,30 .... Fluid Reduction Furnace 40 .... Melt Gasifier

50 .... Hardened Reduced Iron Maker 60 .... Collector

70 .... process water treatment 80 .... sludge dehydrator

90 .... Sludge Dryer 100 .... Crusher

110 ... Classifier 120 ... Sludge Powder Production Equipment

130 ... reservoir 140 ...

150 .. Shut-off valve 160,160a .... Sludge powder storage device

170 .... sludge feed tank 180 .... rotary extractor

190,190a .... sludge powder feeder 200 .... pneumatic conduit

210 .... Dispenser 300,400 .... Sludge Powder Blowing Conduit

S .... Sludge Powder

As a technical aspect for achieving the above object, the present invention, the flow reduction furnace in which the reduced iron ore is reduced inflow; and, melt gasification furnace connected to the compacted reduced iron manufacturing machine; and the melt gasification furnace and preheating furnace In the molten iron manufacturing equipment for manufacturing molten iron using a coal and fine iron ore, including; and a collection dust collector connected to the exhaust gas pipe; A sludge powder production device arranged to be connected to the water processor to dewater, dry, and crush the discharged by-product sludge to produce sludge powder;

A sludge powder storage device connected to the sludge powder production device to store the sludge powder produced by the sludge powder production device; and

A sludge powder supply device for supplying the sludge powder discharged from the sludge powder storage device to a distributor through a pneumatic conduit; And,

The sludge powder injection conduit is connected between the distributor and the final reduction path so as to have a plurality of sludge powder flows to re-inject the sludge powder into the final reduction path.

In addition, as another technical aspect of the present invention, the flow reduction furnace in which the iron ore is reduced inflow; and the molten gasifier connected to the compacted reduced iron production machine; and the molten gasifier and the exhaust gas pipe of the preheating furnace Collection unit; And, a process water treatment device connected to the collector and the process water, in a molten iron manufacturing facility for manufacturing molten iron using coal and fine iron ore, wherein the by-product sludge discharged from the water processor is dehydrated and dried. And a sludge powder production device connected to the water treatment unit so as to produce sludge powder by crushing. Wow,

A sludge powder storage device connected to the sludge powder production device to store the sludge powder produced by the sludge powder production device; Wow,

A sludge powder supply device for supplying the sludge powder discharged from the sludge powder storage device to a distributor through a pneumatic conduit; And,

The sludge powder blowing conduit is connected between the distributor and the oxidant blowing conduit installed in the preheating furnace to have a plurality of sludge powder flows to reinject the sludge powder together with the oxidizing agent into the preheating furnace. By

Finally, as another technical aspect of the present invention, the present invention, a flow reduction furnace in which the reduced iron ore is reduced inflow; and a melt gasification furnace connected to the compacted reduced iron manufacturing machine; and the exhaust gas pipe of the melt gasification furnace and preheating furnace Collector connected to; And, a process water treatment device connected to the collector and the process water, in a molten iron manufacturing facility for manufacturing molten iron using coal and fine iron ore, wherein the by-product sludge discharged from the water processor is dehydrated and dried. And a sludge powder production device connected to the water treatment unit so as to produce sludge powder by crushing. Wow,

A sludge powder storage device connected to the sludge powder production politics to store the sludge powder produced by the sludge powder production device; Wow,

A sludge powder supply device for supplying the sludge powder discharged from the sludge powder storage device to the first and second distributors through the first and second pneumatic conduits; Wow,

A first sludge powder blowing conduit connected between the first distributor and the final reduction path to have a plurality of sludge flows to blow the sludge powder into the final reduction path; And,

By-product sludge recycling of molten iron manufacturing equipment comprising: a second sludge powder inlet conduit connected to the second distributor and an oxidant inlet conduit installed in the preheating furnace to have a plurality of sludge powder flows to inject the sludge powder together with the oxidant By providing a device.

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

FIG. 2 shows a molten iron manufacturing equipment including a first by-product sludge recycling apparatus 1a according to the present invention, and FIG. 3 shows a final reduction path 30 and sludge in the first by-product sludge recycling apparatus 1a according to the present invention. Although the connection structure between the powder blowing conduits 300 is shown in detail, the structure of the molten iron manufacturing equipment similar to the prior art is shown with the same code | symbol.

First, as shown in Figure 2, looking at the configuration of the molten iron manufacturing equipment according to the present invention, the flow reduction path preheating furnace 10 is reduced to the flow of iron ore to the first ore conduit 12 and Three stages of reduced flow paths (10) (20) (30) consisting of a preliminary reduction path (20) connected to two ore conduits (22) and a final reduction path (30) connected to the third ore conduit (32). )

In addition, the final reduction path 30 is connected to the molten gasifier 40 for performing molten iron production through the melting of the ferrous iron ore through the fourth ore conduit 42 having the compacted reduced iron maker 50. .

In addition, between each of the reduction furnaces 10, 20, 30 and the melt gasifier 40, 2-4 reducing gas pipes 44, 34, 24 through which reducing gas flows are connected, and the fourth Each of the exhaust gas pipes 14 connected to the reducing gas pipe 44 and the preheating furnace 10 is connected to collecting dust collectors 60a and 60b for treating the dust contained in the exhaust gas, respectively. They are connected to the process water processor 70 for water treatment of the process water treated in the collector through the process water pipes 62a and 62b.

Therefore, as shown by the respective flows (arrows) in FIG. 2, the iron ore is reduced through the three stages of the flow reduction paths 10, 20, and 30 to be agglomerated in the agglomerated reduced iron manufacturing apparatus 50. Processed and finally charged in the melt gasifier 40, the reducing gas generated at this time is collected by the process water in the collector 60 through the respective pipes, and then the process water containing the dust contained in the exhaust gas Will be sent to the water treatment unit 70, this time to process the by-product sludge to be blown back to the molten iron manufacturing equipment.

Next, FIGS. 2 and 3 illustrate the first by-product sludge recycling apparatus 1a of the present invention. The first by-product sludge recycling apparatus 1a of the present invention includes a sludge powder production apparatus 120, A plurality of sludge powder flows between the sludge powder storage device 160, the sludge powder supply device 190, and the distributor 210a and the final reduction path 30 connected to the supply device 190 and the air conduit 200a. The final reduction of the sludge powder is connected to have a conduit 300 is composed of, looking at each of these components in detail as follows.

First, as shown in Figure 2, the sludge powder production apparatus 120 of the first by-product sludge recycling apparatus (1a) of the present invention, the water treatment device to solidify the water-containing sludge discharged from the water processor (70) The dehydrator 80 connected to the 70, the sludge dryer 90 connected to the dehydrator 80 so as to dry the solidified sludge, and the dryer 90 so as to crush the dried solidified sludge into fine particles. And a sludge powder classifier 110 connected to the crusher 100 so as to classify the crushed sludge powder.

At this time, although the dehydrator 80 is schematically illustrated in the drawings, the dehydrator 80 includes a drum using centrifugal force and a driving means thereof, and a discharge pipe for discharging the treated water contained in the by-product sludge is connected. Since the by-product sludge discharged from 70) has a water content of approximately 50%, when the water content of the sludge is lowered to about 10% through the dehydrator 80, the dehydrated sludge is solidified.

Next, the dryer 90 of the sludge powder production apparatus 120 is sequentially connected to the dehydrator 80 so that the sludge solidified by dehydration of water content up to 10% is dried in the dryer 90 and sludge. The moisture content of the is lowered to 1%, in this case, although not shown in the figure, it would be more preferable to use a high temperature exhaust gas generated in the molten gasifier 40 of the molten iron manufacturing equipment as a heat source of the dryer (90). .

The sludge having a water content lower than 1% through the dehydrator 80 and the dryer 90 is crushed in the crusher 100 sequentially connected to the dryer 90.

At this time, the dried and solidified sludge is crushed through the crusher 100 to be pulverized into a fine particle size, that is, a particle size of about 1mm or less, the crushed particle size of such sludge is described below the pneumatic conduit 200a It is important because it affects the transport of sludge powder (S) through.

In addition, although the crusher 100 of the present invention is not shown in detail in the drawing, it may be possible to use a general crusher that crushes the dry sludge injected into the container as screw blades to a certain granularity.

In addition, the sludge classifier 110 is connected to the crusher 100, so that the solidified and crushed sludge powder S is uniform in the reservoir 130 of the sludge powder storage device 160 described below. 2, the sludge powder S having a large particle size of 1 mm or more may be re-introduced into the crusher 110 through a circulation pipe to be crushed again.

Next, the sludge powder storage device 160 is disposed in connection with the classifier 110 of the sludge powder production device 120, and is supplied to the inert gas supply conduit 134 connected for an inert atmosphere. Storage tank 130 each provided with a gas dust collector 132 provided to the outlet of the inert gas, the expansion pipe 140 connected to the lower side of the storage tank 130, and the sludge installed and stored in the expansion pipe 140 It consists of a shut-off valve 150 for adjusting the supply of powder.

That is, the storage tank 130 is connected to the classifier 110 is stored finely divided, that is, the sludge powder (S) classified and broken down to a particle size of 1mm or less, the storage tank 130, such as an inert gas For example, an inert gas supply pipe 134 for supplying nitrogen gas into the storage tank 130 to maintain the atmosphere in the storage tank 130 as an inert atmosphere is connected.

However, the reason for supplying nitrogen gas into the storage tank 130 through such an inert gas supply conduit 134 is to prevent ignition by carbon components contained in a large amount in the sludge powder S in advance.

In addition, a gas dust collector 132 is installed at an upper portion of the storage tank 130 to collect and recover the sludge powder included in the gas when the inert gas supplied into the storage tank 130 is discharged.

On the other hand, the storage tank 130 is installed on the expansion pipe 140 and the expansion pipe 140 is installed with a shut-off valve 150 is discharged from the outlet (130a) of the storage tank 130 ( Although the flow of S) is schematically illustrated in the drawings, the shutoff valve 150 is provided with upper and lower level switches 172 and 174 installed in the supply tank 170 of the sludge powder supply device 190 described below. ) And the device control unit (not shown) are electrically connected and interlocked.

Next, the sludge powder supply device 190 of the present invention connected to the shutoff valve 150 is connected to the lower side of the sludge storage device 160, and installed above and below the level of the sludge powder to be stored. The upper and lower level switches 172 and 174, and a sludge supply tank 170 provided with a weighing instrument 176 for measuring a sludge weight change therein, and connected with the supply tank 170 to the It consists of a rotary extractor 180 for controlling the supply amount of the sludge powder by adjusting the rotation speed in accordance with the signal of the weighing instrument 176.

That is, the sludge powder S discharged through the outlet 130a of the storage tank 130 by opening the shutoff valve 150 of the sludge powder storage device 160 is introduced into the sludge powder supply tank 170. At this time, the sludge powder (S) flowing into the supply tank 170 is adjusted by the upper and lower level switches 172 and 174 installed in the supply tank 170.

Therefore, when the level of the sludge powder introduced into the supply tank 170 is lower than the lower level switch 174, the lower level switch 174 detects this and opens the electrically connected shutoff valve 150. When the sludge powder (S) is further added to the supply tank 170, on the contrary, when the sludge powder (S) flowing into the supply tank 170 is detected by the upper level switch 172, the shutoff valve 150 ) Is closed and the amount of sludge powder (S) introduced into the supply tank 170 is always kept constant.

Next, since a weighing instrument 176 is provided below the supply tank 170 to measure the weight of the supply tank, the weighing unit 176 is connected to the supply tank 170 according to a signal of the weighing unit 176, and is substantially connected. The rotary extractor 180 which distributes the sludge powder S to the air conduit 200a is linked.

That is, the rotary extractor 180 is interlocked with the weight measuring unit 176 which continuously measures the weight change of the supply tank 170, and the extraction amount thereof is controlled. Such a rotary extractor 180 is an apparatus control unit ( It is electrically connected to and interlocked with the weighing instrument 176 through the not shown.

Next, the sludge powder S supplied through the rotary extractor 180 of the supply device 190 is between the rotary extractor 180 and the distributor 210a disposed on the final reduction path 30. It is supplied to the pneumatic conduit 200a connected to.

At this time, the inlet gas supply pipe 202 is connected to the air supply pipe (200a), the sludge powder (S) supplied to the air supply pipe (200) by the inert gas, that is supplied at a constant pressure, nitrogen gas smoothly dispenser Forced conveyance up to 210a.

However, the reason for using an inert gas such as nitrogen as the gas supplied to the gas conduit 200a is to prevent ignition by carbon components contained in a large amount of sludge.

Next, the final reduction path inlet conduit 300 of the sludge powder, a plurality of sludge powder flow to induce a plurality of sludge powder flow between the distributor 210a disposed adjacent to the final reduction path 30 and the final reduction path (30). The dog is connected and installed.

Therefore, as shown in FIG. 2, the sludge powder S discharged through the rotary extractor 180 of the powder sludge supply apparatus 190 and transferred to the distributor 210a as nitrogen gas through the pneumatic conduit 200a is It is blown into the final reduction path 30 in a number of flows through the distributor (210a).

Meanwhile, FIG. 3 illustrates the final reduction path connection structure of the sludge powder injection conduit 300 in detail. As shown in FIG. 3B, the gas dispersion plate (30) installed at the lower side of the final reduction path 30 ( The fluidized bed T is formed on 30b), and the gas jet layer J by the nozzle of the dispersion plate 30b is formed in this fluidized bed T. As shown in FIG.

Therefore, the blown conduit 300 is not simply connected to the furnace wall 30a of the final reduction path 30, and passes therethrough so that the end portion 300a is formed in the furnace of the final reduction path 30. It is preferable to connect so as to reach within (T), in order to increase the recycling rate of by-product sludge, the sludge powder S re-blowed through the end portion 300a of the blow pipe 300 in the fluidized bed T in the furnace. This is because it is more uniformly mixed with the reduced iron (not shown) while being discharged, and the final reduction path 30 of the blown conduit 300 will be described in more detail as follows.

First, as shown in detail in FIG. 3b, the blown conduit 300 re-injects the sludge powder S having a plurality of flows through the distributor 210a into the final reduction path 30 so that the by-product sludge is recycled. It is preferable to maintain the insertion angle A1 at a constant angle A1 at 30a, that is, 55 ° -65 °, preferably 60 °, relative to the horizontal line at the furnace wall 30a.

At this time, when the furnace wall insertion angle A1 of the blown conduit 300 is smaller than 55 °, the injected sludge powder S is segregated in the center of the furnace fluidized bed T, and conversely, the blown conduit insertion angle If (A1) is larger than 65 °, since the injected sludge powder S is segregated on the lower side of the furnace fluidized bed T, it is best to maintain the insertion angle A1 of the blowing conduit 300 at 60 °. Preferably, depending on the insertion angle, the sludge powder S may be prevented from being uniformly mixed throughout the fluidized bed T in the final reduction path 30, which affects the recycling rate of by-product sludge. .

3A and 3B, the final reduction path insertion depth H1 of the blown conduit 300 is 20-30% of the radius of the radius from the final reduction path side wall 30a, most preferably 25. In this case, since the radius of the furnace is variable, the insertion depth H1 is defined as% of the radius of the furnace.

However, if the insertion depth (H1) of the blown conduit 300 is less than 20% of the radius of the furnace, the sludge powder (S) is the fluidized bed of the final reduction path 30, as in the case of the insertion angle (A1) of the blown conduit (T) is segregated to the side, on the contrary, if it is larger than 30% of the furnace radius, the insertion depth of the distal end 300a of the blown conduit 300 is too long, so that the particles in the furnace fluidized bed T or the gas in the gas jet layer J Because of the problem that the particles to the final reduction of the sludge powder (S) due to the resistance is not smooth, the insertion depth (H1) of the blowing conduit 300 is the most suitable 25% of the furnace radius.

Next, as shown in Figure 3b, the distal end 300a of the blown conduit 300 takes into account the distribution length of the inner gas jet layer (J) of the fluidized bed (T) formed in the final reduction path (30) It is preferable to be spaced apart by a height (L) of 400-500 mm, most preferably 450 mm from the dispersion plate (30b) provided in the bottom in the final reduction path (30).

That is, when the end portion 300a of the blown conduit 300 is less than 400 mm or larger than 500 mm from the in-house gas distribution plate 30b, the gas jet layer J on the gas distribution plate 30b. The sludge powder (S) blown while hitting the resistance by the high-speed gas of the problem does not occur smoothly in the final reduction path (30).

Thus, as shown in Figure 3, the distal end portion 300a of the blowing conduit 300 has a predetermined range of insertion depth (H1), insertion angle (A1), and a predetermined height (L) from the distribution plate (30b) It is to be connected to pass through the furnace wall (30a) of the final reduction path (30), which allows the blown sludge powder (S) is blown without segregation in the fluidized bed (T) in the furnace, and the blown sludge powder (S) In order to increase the recycling rate of the sludge is uniformly mixed in the fluidized bed in the furnace (T), if out of the numerical range described above, the sludge powder (S) through the blowing conduit 300 to the fluidized bed (T) in the furnace It is blown while segregated, which causes the quality of the hardened reduced iron by the hardened reduced iron maker 50 installed on the ore conduit 42 between the final reduction furnace 30 and the melting gasifier 40. .

Next, as shown in FIG. 3A, the plurality of blown conduits 300 branched from the distributor 210a and connected to the final reduction path 30 may vary depending on the size of the final reduction path 30. It is preferable to use about 3 to 6, and such blown conduits (300) are smoothly blown into the sludge powder (S) in the furnace fluidized bed (T) irrespective of the number of installation, and the reduced and reduced iron in the fluidized bed (T) In order to uniformly mix, it is preferable to be disposed at equal intervals in the circumferential direction of the final reduction path (30).

At this time, it is desirable to limit the final reduction of the sludge powder (S) to 4 -6%, most preferably 5% of the amount of iron ore charged in the first preheating furnace 10 of the three-stage flow reduction reactor. However, this is the sludge blown into the final reduction furnace 30, when mixed with the compacted reduced iron manufacturing machine 50 installed on the ore conduit 42 between the final reduction furnace 30 and the melt gasifier 40 This is because the carbon component contained in the powder S affects the quality of the hardened reduced iron.

That is, the sludge powder S blown into the final reduction path 30 does not burn carbon components of the sludge powder blown as in the second by-product sludge recycling apparatus (FIG. 4) described later, and the sludge powder is fluidized. In order to secure the compressive strength and dropping strength of the agglomerated reduced iron, the sludge powder is about 5% of the amount of the iron ore charged into the preheating furnace 10 of the molten iron manufacturing equipment. It is preferable to be blown into this final reduction path 30, and this blowing amount can be adjusted through the rotary extractor 180.

Next, in Table 2 below, when the by-product sludge is recycled, that is, the sludge powder (S) produced through dehydration, drying, and crushing operations is mixed and tested by reducing iron in about 5% by weight. The experimental values related to the quality of the hardened reduced iron (HBI), such as density, compressive strength and the degree of differentiation by drop test are shown, and at the same time, Table 2 below is required for stable operation through the molten iron manufacturing equipment according to the present invention. The quality standards of hardened reduced iron were compared.

Comparison of Quality Standards for Sludge Mixed Hardened Iron division Density (g / cm 3) Compressive strength (Kg / ㎠) + 9.5mm particle size fraction (%) after drop test Aggregated reduced iron mixed with sludge powder 3.7 to 4.46 480-980 90.8 to 96.1 Hardened Reduced Iron Quality Standard > 4 > 400 > 90

Therefore, as can be seen in Table 2 and Figure 2, through the first by-product sludge recycling apparatus (1a) of the sludge powder produced by dewatering, drying and crushing the by-product sludge generated in the water treatment apparatus 70 ( S) was blown into the final reduction furnace 30, mixed with the reduced iron, and the reduced reduced iron produced in the hardened reduced iron making machine 50 from the mixture of the reduced reduced iron and the sludge powder was compacted for the operation of the normal molten iron manufacturing process. It can be seen that it satisfies the quality standard of reduced iron, which indicates that it is possible to apply the first sludge recycling apparatus 1a of the present invention to a molten iron manufacturing process through molten iron manufacturing equipment.

2 and 3, according to the first by-product sludge recycling apparatus (1a) of the present invention, by-product sludge produced during the molten iron manufacturing process to produce a powder (S) to the final reduction path (30) By re-injecting into the fluidized bed of T) and mixed with the reduced reducing iron in the final reduction path 30, and then agglomerated in the compacted reduced iron manufacturing machine 50 and charged into the molten gasifier 40, molten iron manufacturing process The production of by-product sludge is reduced, thereby reducing the cost of sludge treatment, reducing raw material loss due to the recycling of carbon and iron in the sludge, improving productivity of the molten iron manufacturing process and reducing the burden of environmental pollution. will be.

Next, FIGS. 4 to 6 show a molten iron manufacturing equipment including a second by-product sludge recycling apparatus 1b as another embodiment of the present invention, wherein the same as the first by-product sludge recycling apparatus 1a of the present invention. The configuration is denoted by the same reference numerals, and a detailed description thereof will be omitted. Hereinafter, the second by-product sludge recycling apparatus 1b of the present invention will be described in detail.

First, as shown in FIG. 1 and described above, Japanese Patent Laid-Open Nos. 8-337806 and 9, which discloses a method of controlling the temperature of the fluidized bed T in the flow reduction paths 10, 20, and 30, respectively. As disclosed in -280021 and the like, the oxidant is blown into the fluidized bed T (FIG. 5) formed in the preheating furnace 10 so that a part of the reducing gas flowing into the fluidized bed T can be combusted. In order to maintain the temperature of the furnace 10 above a predetermined temperature, the preheating furnace 10 is provided with an oxidant blowing conduit 16 for blowing an oxidant.

Thus, as shown in Figures 4 and 5, the structural features of the by-product sludge recycling apparatus 1b of the second molten iron manufacturing equipment of the present invention is to inject the sludge powder (S) into the oxidant blowing conduit 16. In order to connect the blown conduit 400 for recycling the sludge produced by the molten iron manufacturing equipment.

That is, as shown in Figure 4, the second by-product sludge recycling apparatus (1b) of the present invention, the same as the first recycle sludge recycling apparatus (1a), the dehumidified sludge discharged from the process water processor 70, the production apparatus ( Dehydration, drying and crushing to produce a sludge powder (S) of 1mm particle size 120, the produced sludge powder (S) is recycled to the storage device 160 and the feeder 190 and the first by-product sludge connected thereto Sludge powder blowing, which is conveyed to the distributor 210b disposed adjacent to the preheating furnace 10 via a pneumatic conduit 200b different from the apparatus 1a, and connected between the oxidant blowing conduit 16 and the distributor 210b. It is blown into the preheating furnace 10 through the oxidant blowing conduit 16 through the conduit 400, and eventually recycling of by-product sludge is performed.

Therefore, as shown in FIG. 5, sludge powder S is blown into the fluidized bed T together with the oxidant supplied through the oxidant blown conduit 16 into the internal fluidized bed T of the preheating furnace 10. Sludge powder (S) blown from the combustion zone formed in the fluidized bed (T) to the front of the oxidant blowing conduit 16 is combusted and dissolved agglomeration, by-product sludge treated by-product sludge during the molten iron manufacturing process Powder (S) is to be recycled.

At this time, as shown in Figure 5, the sludge powder injection conduit 400 also has the oxidant injection conduit 16 to have a predetermined angle (A2) and the insertion depth (H2) like the first by-product sludge recycling apparatus (1a) It is preferable for the smooth supply flow of the sludge powder (S) to be connected through.

That is, the sludge powder blowing conduit 400 with respect to the oxidant blowing conduit 16 is preferably connected to the insertion angle (A2) of 60-75 °, preferably 67 °, such a blowing conduit insertion angle ( A2) is the angle of repose of the sludge powder (S), that is, the minimum angle of free fall of the sludge powder (S) is 60 °, the sludge powder is uniform to the oxidant flow without segregation in the oxidant blowing conduit (16) This is because the maximum angle that can be dispersed is 75 °.

At the same time, the distal end portion 400a of the sludge powder blowing conduit 400 connected to the oxidant blowing conduit 16 has a diameter H of the oxidant blowing conduit 16 having a penetration depth H2 of the oxidant blowing conduit 16. It is appropriate to make it 30-60% preferably 45% with respect to D), and the insertion depth (H2) of the distal end of the blowing conduit (400) is more than 30% with respect to the diameter (D) of the oxidant blowing conduit (16). When the sludge powder (S) is less than or greater than 60%, the sludge powder blowing conduit of the present invention falls within the above range because the sludge powder (S) is segregated without being smoothly incorporated into the oxidant supply flow fed into the flow reduction reactor through the oxidant blowing conduit (16). It is preferred that 400 is connected.

Therefore, when the sludge powder S together with the oxidant is supplied through the oxidant blowing conduit 16 into the internal fluidized bed T combustion zone of the preheating furnace 10, the reducing gas pipe 24 of the preheating furnace 10 is supplied. Blowing in the combustion zone formed in the fluidized bed T at the tip end side of the oxidant injection conduit 16 by the reducing gas supplied from the preliminary reduction path 20 to the upper side through the gas distribution plate 10b inside the furnace. The carbon component in the sludge powder is gasified by the oxygen component in the oxidant blown together and the following formula (1).

C + λO _2- > (2-2 λ) CO + (2 λ-1) CO ₂

At this time, "λ" in the formula (1) means the number of moles of oxygen in the oxidant for the combustion of the carbon component contained in the sludge powder (S), as shown in Figure 6, the burnability test of the sludge powder (S) As can be seen, the optimum combustion is achieved when the molar ratio (λ) of O ₂ / C is about 0.6 ~ 0.7.

As can be seen from Table 1, since the carbon content in the sludge reaches 38% by weight, the mole number of the carbon component in 1 kg of sludge is 1 × 0.01 × 38/12 = 0.032, 12 is the molecular weight of carbon.

As a result, the optimum number of moles of oxygen (O ₂ ) is 0.6 × 0.032 to 0.7 × 0.032 − because the optimum combustion occurs at a molar ratio (λ) of O ₂ / C of 0.6 to 0.7, as shown in the graph of FIG. 6. It can be seen that it is> 0.0192 ~ 0.0224, the optimum oxygen Nm ³ is 0.0192 × 22.4 ~ 0.0224 × 22.4-> 0.43 ~ 0.50, wherein 22.4 is the value obtained from the number of moles of oxygen 1kg = 22.4 Nm ³ .

Accordingly, as shown in FIG. 5, since combustion of the sludge powder S blown through the sludge powder blowing conduit 400 requires 0.43 to 0.50 Nm ³ of oxygen per 1 kg of sludge powder. The amount of oxidant blown through the oxidant blowing conduit 16 should be increased by the amount required for combustion of the sludge powder S than the amount of the oxidant required for temperature control in the fluidized bed T of the preheating furnace 10. do.

That is, the amount of oxidant blown into the oxidant blown conduit 16 of the preheating furnace 10 is increased through the sludge powder blown conduit 400 so as to increase the combustion rate of the combustion zone formed in the furnace. It is preferable to increase 0.43 to 0.50 Nm ³ per 1 kg of blowing amount.

As shown in FIG. 5, the remaining iron components and ash components included in the sludge powder S blown into the combustion zone in the fluidized bed of the preheating furnace 10 are dissolved and aggregated in the combustion zone to form the preheating furnace ( 10) is grown to a particle size such that it does not scatter from the fluidized bed (T) to the top, and then dispersed in the fluidized bed (T) and mixed with the ferrite ore (not shown) in the fluidized bed (T) preheating furnace (10) And the preliminary reduction furnace 20 connected to the second ore conduit 22 and the final reduction furnace 30 are finally compacted together with the reducing iron in the compacted reduced iron maker 50 to melt gasification furnace 40. It is charged and recycled.

However, the following Table 3 shows the results of evaluation of the dissolution of the iron and ash components in the sludge powder in the combustion test of the sludge powder, the particle size of 1mm or more under the optimum combustion conditions of the carbon components contained in the sludge powder In the fluidized bed T of the preheating furnace 10, the melting and aggregating ratio is about 80% or more, so that 90% of the sludge powder is recycled to the second by-product sludge of the present invention. It will be appreciated that it can be recycled by the device 1b.

Dissolution Coagulation Rate of Iron and Ash Components in Combustion of Sludge Powder Sludge Combustion Condition (λ = O ₂ / C) 0.6 0.7 Dissolution Coagulation Rate of Iron and Ash Components in Sludge (+ 1mm) 82.5% 87.75

Accordingly, according to the second by-product sludge recycling apparatus 1b of the present invention as described above, by-product sludge produced in the molten iron manufacturing process to produce a sludge powder having a particle size of less than 1mm and the fluidized bed (T) of the fluid reduction reactor By blowing with the oxidant through the oxidant blowing conduit 16 installed in the preheating furnace 10 to control the temperature, the carbon component of the sludge powder together with the oxidant in the internal combustion zone of the fluidized bed is gasified by combustion reaction, Ash components, etc. are melted and agglomerated by combustion heat and mixed with ferrous ore while being dispersed in a fluidized bed and melted in a compacted state through a preliminary reduction furnace 20, a final reduction furnace 30, and a hardened reduced iron maker 50. Since it is charged to the gasifier 40, the amount of by-product sludge generated during the molten iron manufacturing process is reduced, thereby reducing the sludge treatment cost and rehabilitation of carbon and iron components in the sludge. Sikieo reducing the material loss due to improving the productivity of the molten iron manufacturing process, On the other hand, it is to relieve the burden of environmental pollution.

Next, Figure 7 shows a by-product sludge recycling apparatus 1c of the third molten iron manufacturing equipment, which is another embodiment of the present invention, the same configuration as the first and second by-product sludge recycling apparatus (1a) (1b) described above Denoted by the same reference numerals, the description of the operation is brief, and the third byproduct sludge recycling apparatus 1c of the present invention will be described in detail.

First, the structural features of the by-product sludge recycling apparatus 1c of the third molten iron manufacturing equipment of the present invention is the first and second by-product sludge recycling apparatuses 1a and 1b of the present invention shown in Figs. Sludge powder injection conduit 300, 400 is equipped with a molten iron manufacturing equipment at the same time.

That is, as shown in Fig. 7, the third by-product sludge recycling apparatus 1c of the present invention, like the first and second by-product sludge recycling apparatus (1a) (1b), the moisture impregnated by the process water processor 70 The sludge is dewatered, dried, and crushed by the production apparatus 120 to produce sludge powder S having a particle size of 1 mm, and the produced sludge powder S is connected to the storage device 160a and the supply device 190a and connected thereto. The first and second distributors 200a and 200b are transferred to the first and second distributors 210a and 210b disposed adjacent to the final reduction path 30 and the preheating path 10, and the first and second air flow conduits 200a and 200b. The sludge powder is preheated through each of the first and second blowing conduits 300 and 400 connected between the distributor 210a and 210b and the final reduction path 30 and the oxidant blowing conduit 16 of the preheating furnace 10. It is blown into the furnace and the finalization furnace 30, 10, and eventually recycling of by-product sludge is performed.

At this time, as shown in FIG. 7, the sludge powder storage device 160a of the third by-product sludge recycling apparatus 1c of the present invention is provided with a storage tank 130 having two outlets 130a and 130b. To this end, a pair of expansion pipes 140a and 140b and shutoff valves 150a and 150b are respectively connected.

Each of the shutoff valves 150a and 150b includes upper and lower level switches 172a, 174a, 172b and 174b for detecting the level of the sludge powder S introduced therein. At the same time, a pair of sludge supply tanks 170a and 170b, each of which is provided with a pair of weighing instruments 176a and 176b for measuring the weight change of the sludge powder introduced into the lower part, are connected to the respective supply tanks 170a and ( 170b) is provided with a pair of rotary extractors 180a and 180b for adjusting the supply amount of the sludge powder S by adjusting the rotation speed according to the signals of the weighing devices 176.

At this time, the rotary extractors 180a and 180b are electrically connected to an apparatus control unit (not shown) to control the amount of injection of the sludge powder S injected into the oxidant blowing conduit 16 and the final reduction path 30. It is preferable to be connected and interlocked with each other.

In addition, the first and second pneumatic conduits 200a and 200b are connected to the rotary extractors 180a and 180b, respectively, so that the sludge powder S is connected to the first and second distributors 210a and 210b. It is supplied to the first and second blown conduit 300, 400 through each.

Therefore, as shown in FIG. 7, the sludge powder S blown into the final reduction path 30 is dispersed in the fluidized bed T, mixed with the reduced reduction iron, and discharged from the reduced reduction iron maker 50. The sludge powder S blown together with the oxidizing agent supplied to the fluidized bed T of the preheating furnace 10 through the oxidant blowing conduit 16 and simultaneously being agglomerated and introduced into the melt gasification furnace 40 is supplied. In the combustion zone of (T), the carbon component of the sludge powder (S) is burned and gasified, and the iron and ash components are dissolved and aggregated and mixed with the ring reducing iron, respectively, to reducers 20 and 30 and the hardened reduced iron maker 50 By input into the melt gasifier 40 in the compacted state through), by-product sludge is recycled.

3, 5 and 7, the first sludge powder blowing conduit 300 has an insertion depth H1 and a furnace wall 30a in the range of 20-30% of the radius of the final reduction path 30. ) And 55-65 ° connection angle (A1), and the final reduction so that the end portion 300a has an insert depth (L) of 400-500 mm from the internal gas reaction plate (30b) of the final reduction path 30 Is connected to the furnace 30, the reason for such a limitation is as already described in the description of the first by-product sludge recycling apparatus (1a).

In addition, the second sludge powder blowing conduit 400 also blows the oxidant at a insertion depth H2 of 30 to 60% and a connecting angle A2 of 60 to 75 ° with respect to the diameter D of the oxidant blowing conduit 16. Connected to the conduit 16, the limiting reason for this value is the same as already explained in the description of the second by-product sludge recycling apparatus 1b.

At this time, as shown in Figure 7, the blowing amount of the sludge powder (S) supplied to the final reduction path 30 through the first sludge powder injection conduit 300 is the iron ore blown into the preheating furnace (10) 4 to 6%, preferably 5% of the blowing amount of is preferably as described above in the description of the first by-product sludge recycling apparatus 1a.

Therefore, the amount of sludge powder injected into the final reduction path 30 through the first sludge powder injection conduit 300 is set in accordance with the amount of charged reduction iron charged into the preheating furnace 10, and then the sludge powder that can be supplied. The remaining blowing amount except the final reducing furnace blowing amount from the total blowing amount of is blown into the oxidant blowing conduit 16 through the second blowing conduit 400.

In addition, as shown in Figures 5 and 7, the amount of oxidant blown through the oxidant blown conduit 16 also matches the amount of sludge powder blown through the second blown conduit 400, When the blowing amount of (S) is increased by 1 kg, it is increased by 0.43 to 0.50 Nm ^3, which is the same as described in the second by-product sludge recycling apparatus 1b.

Therefore, the third by-product sludge recycling apparatus 1c of the present invention includes all of the first and second blow-through conduits 300 and 400, so that the third and second by-product sludge recycling apparatuses 1a and 1b are more mechanically connected. Although complicated, the equipment trouble is provided in any one of the first and second blown conduits 300 and 400 and the first and second distributors 210a and 210b of the first and second by-product sludge recycling apparatuses 1a and 1b. If it occurs, it will be useful in terms of the operation of the overall molten iron manufacturing equipment since the recycling of the by-product sludge can be continued using the normal remaining blown conduit.

Next, in the first to third by-product sludge recycling apparatus (1a) (1b) (1c) shown in Figures 2, 4 and 7, each inlet gas supply pipe (200a), 200b is inert gas supply pipe 202 The sludge powder S supplied from each rotary extractor 180, 180a, 180b of the sludge powder supply apparatus 190, 190a is respectively connected to the final reduction path 30 and the preheating furnace 10 The dispenser 210a, 210b of the side is more smoothly conveyed.

In addition, although not shown in detail in FIGS. 2, 4 and 7, the air conduits 200a and 200b, the respective sludge powder blowing conduits 300 and 400, and the respective ore conduits 12 and 22, respectively. 32, 42, reducing gas pipes 44, 34, 24, flue gas pipes 14, process water pipes 62a and 62b between the water processor 70 and the dust collector 60a and 60b. Of course, the on-off valves for adjusting the flow of the fluid flowing through them, that is, sludge powder, ore, reducing gas, exhaust gas, and process water is of course installed.

In addition, as shown in Figs. 2, 4 and 7, the image of the supply device 190, 190a in conjunction with the shut-off valves 150, 150a, 150b of the storage device 160, 160a. Lower level switches 172, 174, 172a, 174a, 172b, 174b, and the feed tank weight support 176, 176a, 176b and rotary extractor 180, 180a interlocked with it. Although not shown in the drawings, 180b is electrically connected to each other through the storage control unit, and the operation thereof is interlocked with each other. In particular, the rotary extractor in the third by-product sludge recycling apparatus 1c may include the first and second sludge powder blowing conduits 300. In order to supply an appropriate amount of sludge powder to (400), it must be interlocked through the device control unit.

According to the first and second by-product sludge recycling apparatus (1a) (1b) of the present invention, the by-product sludge produced during the molten iron manufacturing process is powdered, the fluidized bed (T) of the final reduction path 30 and the preheating furnace 10 By re-injection into a molten gasifier 40 after re-injection into the molten gas and mixed with the ring reducing iron, the amount of by-product sludge is reduced during the molten iron manufacturing process, thereby reducing the sludge treatment cost, while To reduce the loss of raw materials due to the recycling of carbon and iron components to improve the productivity of the molten iron manufacturing process, while also providing an excellent effect of reducing the burden of environmental pollution.

Further, according to the third by-product sludge recycling apparatus 1c of the present invention as described above, in addition to the effect of the first and second by-product sludge recycling apparatuses 1a and 1b, the first and second by-product sludge recycling apparatuses By providing both the blowing conduits 300 and 400 of (1a) and (1b), if equipment trouble occurs on the distributor and the blowing conduits side, one of the normal ones can be selected to continuously recycle the by-product sludge. In terms of device operation, it provides an easy and practical effect.

While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that the invention can be modified and modified in various ways without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (17)

Flow reducing reactors 10, 20, 30 through which reduced iron ore flows in and out; and a molten gasifier 40 connected thereto through a compacted reduced iron maker 50; and the molten gasifier 40 and Collecting dust 60 connected to the exhaust gas pipe 14 of the preheating furnace 10; And, the process water treatment unit 70 is connected to process the collecting dust 60 and the process water; including coal and fine iron ore In the molten iron manufacturing equipment for manufacturing molten iron, A sludge powder production apparatus 120 connected to the water processor 70 so as to produce sludge powder by dewatering, drying, and crushing the by-product sludge discharged from the water processor 70; Wow, A sludge powder storage device 160 connected with the sludge powder production device 120 to store the sludge powder S produced by the sludge powder production device 120; Wow, A sludge powder supply device 190 for supplying the sludge powder discharged from the sludge powder storage device 160 to the distributor 210a through a pneumatic conduit 200a; And, A sludge powder blowing conduit (300) connected between the distributor (210a) and the final reduction path (30) to have a plurality of sludge powder flows to re-inject the sludge powder (S) into the final reduction path (30); By-product sludge recycling apparatus of molten iron manufacturing equipment According to claim 1, The sludge powder blowing conduit 300 is the end portion 300a of the passage through the furnace wall 30a is inserted into a depth (H1) of the radius of 20 ~ 30% of the final reduction path 30, By-product sludge recycling apparatus, characterized in that the connection angle (A1) of the furnace wall (30a) of the sludge powder injection conduit 300 is made of 55 ~ 65 ° with respect to the furnace wall (30a). The terminal 300a of the sludge powder blowing conduit 300 is 400 to 500 mm away from the dispersion plate 30b installed in the lower side of the final reduction path 30. By-product sludge recycling apparatus, characterized in that connected to According to claim 1, wherein the blowing amount of the sludge powder (S) blown into the final reduction path 30 through the blowing conduit 300 is 4 ~ with respect to the blowing amount of the iron ore blown into the preheating furnace (10). By-product sludge recycling apparatus, characterized in that made of 6% Flow reducing reactors 10, 20, 30 through which reduced iron ore flows in and out; and a molten gasifier 40 connected thereto through a compacted reduced iron maker 50; and the molten gasifier 40 and Collecting dust 60 connected to the exhaust gas pipe 14 of the preheating furnace 10; And, the process water treatment unit 70 is connected to process the collecting dust 60 and the process water; including coal and fine iron ore In the molten iron manufacturing equipment for manufacturing molten iron, A sludge powder production device 120 connected to the water processor 70 to produce sludge powder by dewatering, drying, and crushing the by-product sludge discharged from the water processor 70; and A sludge powder storage device 160 connected with the sludge powder production device 120 to store the sludge powder S produced by the sludge powder production device 120; Wow, A sludge powder supply device 190 for supplying the sludge powder discharged from the sludge powder storage device 160 to the distributor 210b through a pneumatic conduit 200b; And, The sludge powder is connected between the distributor 210b and the oxidant blowing conduit 16 installed in the preheating furnace 10 so as to have a plurality of sludge powder flows to reinject the sludge powder S together with the oxidant to the preheating furnace 10. Blown conduit 400; by-product sludge recycling apparatus of the molten iron manufacturing equipment, characterized in that consisting of According to claim 5, The sludge powder blowing conduit 400 is connected to the insertion depth (H2) of 30 to 60% with respect to the diameter (D) of the oxidant blowing conduit 16, By-product sludge recycling apparatus characterized in that the oxidant blowing conduit connection angle (A2) of the sludge powder injection conduit 400 is made of 60 ~ 75 °. The by-product sludge recycling apparatus according to claim 5, wherein the blowing amount of the oxidizing agent blown through the oxidizing agent blowing conduit 16 is increased by 0.43 to 0.50 Nm ³ per 1 kg of blowing amount of the sludge powder (S). Flow reducing reactors 10, 20, 30 through which reduced iron ore flows in and out; and a molten gasifier 40 connected thereto through a compacted reduced iron maker 50; and the molten gasifier 40 and Collector 60 connected to the exhaust pipe of the preheating furnace 10; And, in the molten iron manufacturing equipment for manufacturing molten iron using coal and fine iron ore, including a process water treatment device 70 is connected to process the collection water and the collecting pendulum 60, A sludge powder production device 120 connected to the water processor 70 to produce sludge powder by dewatering, drying, and crushing the by-product sludge discharged from the water processor 70; and A sludge powder storage device (160a) connected with the sludge powder production political value (120) to store the sludge powder (S) produced by the sludge powder production device (120); Wow, A sludge powder supply device 190a for supplying the sludge powder discharged from the sludge powder storage device 160 to the first and second distributors 210a and 210b through the first and second air conduits 200a and 200b; Wow, A first sludge powder blowing conduit (300) connected between the first distributor (210a) and the final reduction path (30) to have a plurality of sludge flows to blow the sludge powder (S) into the final reduction path (30); And, The second distributor 210b is connected to the oxidant blowing conduit 16 installed in the preheating furnace 10 so as to have a plurality of sludge powder flows to blow the sludge powder S together with the oxidizing agent into the flow reduction path 10. By-product sludge recycling apparatus of the molten iron manufacturing equipment characterized in that consisting of; 2 sludge powder blowing conduit (400); According to claim 8, wherein the distal end portion (300a) of the first sludge powder blowing conduit (300) is the final reduction path (H1) to have a depth of insertion (H1) in the range of 20 to 30% of the radius of the final reduction path (30) 30), the final reduction path connecting angle (A1) of the first sludge powder blowing conduit 300 is made of an angle of 55 ~ 65 ° with the furnace wall (30a), End portion 300a of the first sludge powder blowing conduit 300 is characterized in that it is configured to have an insert height (L) of 400 ~ 500mm from the reaction plate (30b) installed inside the final reduction path (30) By-product Sludge Recycling Equipment The end portion 400a of the second sludge powder blowing conduit 400 is an oxidant blowing pipe having a insertion depth H2 of 30 to 60% of the diameter D of the oxidizing agent blowing conduit 16. 16), By-product sludge recycling apparatus characterized in that the connection angle (A2) of the oxidant blowing conduit (16) of the second sludge powder blowing conduit (400) is made of 60 ~ 75 °. The amount of blown iron ore blown into the preheating furnace 10 according to claim 8, wherein the blowing amount of the sludge powder S blown into the final reduction path 30 through the first sludge powder blowing conduit 300 is increased. 4 to 6% of the The amount of the oxidant blown through the oxidant blown conduit 16 is increased by 0.43 to 0.50 Nm ³ per 1 kg of the sludge powder S blown through the second sludge powder blown conduit 400. By-product sludge recycling apparatus for molten iron manufacturing equipment. The water sludge powder producing apparatus 120 according to any one of claims 1, 5, and 8, wherein the sludge powder production apparatus 120 solidifies the water-containing sludge discharged from the water processor 70. A dehydrator 80 connected to the dehydrator; Wow, A sludge dryer 90 connected to the dehydrator 80 to dry the solidified sludge; Wow, A crusher 100 connected to the dryer 90 so as to crush the dried solidified sludge into fine particles; And, By-product sludge recycling apparatus characterized by consisting of; sludge powder classifier 110 is connected to the crusher 100 to classify the crushed sludge powder; According to claim 1 or 5, The sludge powder storage device 160, the inert gas supply conduit 134, which is connected to the sludge powder production apparatus 120, connected for an inert atmosphere, and the inside A storage tank 130 having a gas dust collector 132 provided at an outlet of the supplied inert gas; Wow, Stretch pipe 140 is connected to the lower side of the reservoir 130; And, By-product sludge recycling apparatus, characterized in that consisting of; shut-off valve 150 is installed in the expansion pipe 140 to adjust the supply of the stored sludge powder The method of claim 8, wherein the sludge powder storage device (160a), It is provided with an inert gas supply conduit 134 connected to the sludge powder production apparatus 120 and connected for an inert internal atmosphere, and a gas dust collector 132 provided at an outlet of the inert gas supplied therein, Reservoir 130 having an outlet 130a, 130b of; And, Stretch pipes 140a and 140b respectively connected to the dual outlets of the reservoir 130; And, By-product sludge recycling apparatus, characterized in that consisting of; shut-off valves (150a, 150b) for adjusting the supply of the stored sludge powder is installed in each of the expansion pipe 140 According to claim 1 or 5, The sludge supply apparatus 190, It is connected to the lower side of the sludge storage device 160, and provided with upper and lower level switches 172 and 174 installed on the upper and lower portions so as to detect the level of the sludge powder to be stored. A sludge powder supply tank 170 provided with a weighing instrument 176 to measure; And, By-product sludge recycling apparatus characterized in that consisting of; rotary extractor 180 is connected to the supply tank 170 to control the supply amount of the sludge powder by adjusting the rotation speed in accordance with the signal of the weighing device 176 According to claim 8, The sludge supply apparatus 190a, The upper and lower level switches 172a, 174a, 172b and 174b respectively connected to the lower side of the sludge storage device 160a and installed in the upper and lower portions so as to sense the level of the sludge powder to be stored, respectively. The sludge powder supply tanks 170a and 170b respectively provided with weighing units 176a and 176b for measuring sludge weight changes therein; And, Rotating extractors 180a and 180b which are connected to the respective supply tanks 170a and 170b and adjust the supply amount of the sludge powder S by controlling the rotation speed according to the signals of the weighing devices 176. By-product sludge recycling apparatus characterized in that consisting of; 9. The by-product sludge according to any one of claims 1, 5, and 8, wherein an inert gas conduit 202 is connected to the air-conduit pipes 200a and 200b to smoothly transport the sludge powder. Recycling equipment