KR20130005027A - Apparatus for supplying pulverized coal to blast furnace - Google Patents

Abstract

PURPOSE: An apparatus for supplying pulverized coals to a blast furnace is provided to remove the injection deviation of the pulverized coals into the blast furnace and to obtain air permeability at the center of the blast furnace. CONSTITUTION: An apparatus for supplying pulverized coals to a blast furnace(1) comprises a pulverized coal supply line(110) and a uniform pulverized coal supply unit. The pulverized coal supply line is connected to a pulverized coal injection lance installed in a tuyere of a blast furnace. The uniform pulverized coal supply unit is installed in at least one spot of the pulverized coal supply line and uniformly injects pulverized coals to the blast furnace.

Description

[0001] APPARATUS FOR SUPPLYING PULVERIZED COAL TO BLAST FURNACE [0002]

The present invention relates to a pulverized coal supply apparatus for supplying pulverized coal into a blast furnace in order to increase the productivity of blast furnace blast furnace, and more particularly, to a pulverized coal supply apparatus for blast furnace supply line, To a blast furnace for supplying blast furnace to a blast furnace at a desired level while supplying a desired amount of blast furnace to a blast furnace in a more uniform environment so as to maximize the production efficiency of molten blast furnace .

Generally, in the blast furnace operation, the coke as fuel and the raw iron ore are charged from the upper part of the blast furnace, and the hot air generated by the blower is blown through the blowing pipe and blown through the tuyere below the blast furnace.

At this time, the coke charged into the blast furnace is burnt in the combustion zone located below the blast furnace fuselage, and the iron ores in the furnace are reduced and melted by the heat and the reducing gas generated at this time to generate the slag and the slag. It is discharged through a pioneer.

However, in such a blast furnace operation, pulverized coal as a coke substitute fuel is blown into the furnace through a separate blowing lance (see "50" in FIG. 1) connected to the side of the tuyere in order to minimize environmental pollution and reduce coke production cost .

At this time, the pulverized coal is produced by crushing the coal that is mixed with the coal hopper by the conveying facility such as belt conveyor from the granulation facility into pulverized powder in the pulverizer, and the pulverizer is supplied with the waste gas from the hot air furnace.

The produced pulverized coal is blown into the blast furnace through the pulverized coal blowing lance via the pulverized coal supply line of a certain diameter by the high-pressure conveying air.

At this time, when the pulverized coal blown into the blast furnace is unburned in the blast furnace, the unburned pulverized coal is deposited in the coke layer in the furnace to deteriorate the furnace environment for forming the furnace or is discharged to the outside through the furnace.

Therefore, when the blast furnace operation environment is made difficult, or when the blast furnace is discharged through the openings, environmental pollution is caused.

However, in the conventional case, as shown in Fig. 7, the pulverized coal was simply blown into the blast furnace 10 through the blow-off nozzle 30 through the blow nozzle.

Therefore, when the pulverized coal is accumulated in the furnace, the pulverized coal is injected into the blast furnace through such a simple blowing nozzle in such a way that the burning layer (bird nest layer) 14 ).

In this case, the blowing of the pulverized coal is blocked by the blast furnace slag layer 14, thereby making it difficult to smoothly and uniformly blow in the blast furnace. In this case, the pressure of the wind (air) Thereby causing a burden of operation.

In addition, the fine coal which is not blown into the blast furnace smoothly combines with the melt to lower the fluidity of the melt, which ultimately makes it difficult to discharge the molten iron through the outlet, or makes the gas flow in the blast furnace difficult.

Therefore, the pulverized coal which can not be smoothly introduced into the blast furnace, particularly the unburnt pulverized coal, deteriorates the ventilation and liquid permeability of the gas and the melt in the furnace, resulting in gas flow failure and quality instability.

Particularly, if hot air can not proceed to the core 12 due to the above-described scuff layer 14, the supply of hot air required for combustion of the coke is not smooth, which causes the heat in the core 12 to be lowered, Making the combustion of the coke difficult and also making the furnace atmosphere unfavorable to the operation.

On the other hand, since the unburnt pulverized coal tends to increase as the amount of pulverized coal charged increases, there is a need for a method capable of improving the combustibility or effectively removing the pulverized coal that has not been burned in the furnace during operation.

One of the conventional methods of solving inertness in the core 12 is to increase the temperature inside the blast furnace to remove unburnt pulverized coal when it is determined that the core 12 is in an inactive state due to unburnt pulverized coal However, in order to further increase the heat of the blast furnace as described above, the amount of coke to be charged must be increased, which causes problems such as a decrease in production efficiency and an increase in additional cost.

Alternatively, as a method for eliminating the unburned coal, there is a method of increasing the flow velocity of the tuyere to remove the core 12 or the scuffing layer 14 that is stained (fixed) by the unburnt pulverized coal. In this case, In order to increase the flow rate, it is necessary to replace the tuyere with a relatively small diameter after the operation stoppage. Therefore, there is a problem that a large amount of cost and time are required for cost and facility replacement since the large- There is a problem that the scuffing layer 14 is formed again after a certain period of time has elapsed.

As a result, conventional techniques for removing such unburnt pulverized coal have been problematic in that they are not easy to implement because of lowering the production efficiency of the blast furnace or supplementing the equipment.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to improve the pulverized coal combustion by uniformly injecting the pulverized coal into the blast furnace through the simple structure improvement of the pulverized coal supply line, The present invention is to provide a pulverized coal supply device for a blast furnace capable of preventing formation of scuffs and layers due to unburnt pulverized coal in the existing blast furnace, deterioration of melt and gas flowability, and the like.

In addition, the present invention not only eliminates bleed-out fluctuations of pulverized coal, but also controls the blowing ability of the pulverized coal to enable proper pulverization of the pulverized coal, formation of a smudge layer if necessary, and smooth ventilation to the blast furnace, Thereby improving the quality of the pulverized coal.

Technical Solution In order to achieve the above object, the present invention provides a pulverized coal supply line connected to a pulverized coal blowing lance provided on a tuyere side of a blast furnace; And

A pulverized coal uniform supply means connected to at least one point of the pulverized coal supply line and uniformly supplied pulverized coal to the blast furnace;

Wherein the pulverized coal supply device comprises:

Preferably, the pulverized coal uniform supply means is composed of an expanded portion provided in the pulverized coal supply line and extending the pulverized coal receiving space beyond the supply line.

More preferably, the bulging portion may be formed in one of circular, circular, polygonal, and conical shapes that are connected to a pulverized coal supply line associated with a pulverized coal supply hopper.

At this time, the high-pressure gas inlet pipe is connected to at least one of the expansion parts and is provided to facilitate the blowing of the pulverized coal into the blast furnace.

Preferably, the high-pressure gas inlet pipe is provided so that a plurality of high-pressure gas inlet pipes are connected to the expanded pipe section in a predetermined pattern, and inject a high-pressure gas toward the pulverized coal outlet of the expanded pipe section.

Alternatively, the high-pressure gas inlet pipe includes a forward high-pressure gas inlet pipe and a reverse high-pressure gas inlet pipe provided so as to collide with the high-pressure gas inside the expansion portion to uniformly blow the pulverized coal through the vortex generation, The gas inlet tube is to inject high pressure gas at a higher pressure or flow rate than the reverse high pressure gas inlet tube.

Preferably, the vortex generating device further includes vortex generating means provided on the downstream side of the pulverized coal outlet of the expanded portion to collide the pulverized coal so as to form an outflow, and to uniformly blow the pulverized coal.

At this time, the vortex generating means includes impingement rods that are provided inside the supply line or the connection pipe between the expansion portion and the pulverized coal blowing lance.

In addition, the pulverized coal supply line is connected to a pulverized coal feed hopper, and the high-pressure gas feed pipe is connected to a high-pressure gas feed blowing line, and control valves associated with a device control unit associated with a pressure gauge provided in the pulverized coal supply line are provided .

According to the present invention, unlike the prior art, by improving the simple structure of the pulverized coal supply line, it is possible to uniformly blow the pulverized coal into the blast furnace without any deviation, thereby improving the pulverized coal combustion property and forming a scuffing layer by the unburnt pulverized coal in the existing blast furnace, Or the gas flowability is prevented.

Therefore, the present invention improves the cost of the pulverized coal simply by increasing the cost without maintenance.

As a result, the present invention can eliminate bleeding variation of pulverized coal by controlling the blowing ability of the pulverized coal, enable smooth pulverization of the pulverized coal, form a scuffing layer if necessary, and ensure smooth ventilation to the pulverized core, .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall schematic view showing a pulverized coal supplying apparatus in connection with a blast furnace according to the present invention; Fig.
2 is a detailed configuration diagram showing the apparatus of the present invention.
3 and 4 are schematic views showing another form of the bending portion in the apparatus of the present invention
6 is a schematic view showing another embodiment of the high-pressure gas supply pipe in the apparatus of the present invention
7 is a graph showing the pulverized coal load per hour associated with pulverized coal blowing through the apparatus of the present invention
FIG. 8 is a schematic view showing a scuffing layer and a core by conventional unburnt pulverized coal;

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

1 and 2 show a pulverized coal supply device 1 according to the present invention.

For example, the pulverized coal supply device 1 according to the present invention includes a pulverized coal supply line 110 connected to the pulverized coal receiving lance 50 provided on the side of the tuyere 30 of the blast furnace 10, And a pulverized coal uniform supply means provided uniformly to blow the pulverized coal to at least one point of the pulverized coal supply line.

At this time, the pulverized coal uniform supply unit of the present invention may be composed of an expansion unit 130 provided in the pulverized coal supply line 110 and extending the pulverized coal receiving space than the supply line.

1 and 2, the pulverized coal supply line 110 may be configured by a combination of a supply pipe and a supply hose or the like, and particularly, The connection pipes 112 having a predetermined diameter may be connected to both sides of the expansion part where the inner powdery coal receiving space is expanded.

Specifically, the pipes are connected to each other by a flange fastening structure (F), and as shown in Fig. 2, the pipe-expanding portion 130 is welded to both sides of the pipe- The connection pipe 112 is provided as a connection pipe portion 130b having a predetermined diameter to be flanged, but the present invention is not limited thereto.

As shown in FIG. 1, the pulverized coal supply hopper 190 is connected to the pulverized coal supply line 110. Although not shown in detail in the drawing, the pulverized coal is supplied from the feed hopper to the expanded portion 130 ). ≪ / RTI >

Therefore, in the case of the pulverized coal supply device 1 of the present invention, since the pulverized coal supply device 1 includes the expanded portion 130 of the pulverized coal uniform supply means whose diameter is expanded rather than the supply line, The distribution of the pulverized coal is supplied more uniformly than in the prior art, and this makes it possible to eliminate the deviation of the pulverized coal in the blast furnace and to improve the combustibility thereof.

As a result, in the present invention, the pulverized coal non-burning due to the non-uniform blowing at the time of blowing the pulverized coal into the pulverized coal furnace through the existing simple supply line is removed in the present invention to eliminate the blockage of blowing into the pulverized layer 14 and the core as shown in FIG. It is possible to solve various problems in the related art.

For example, as shown in FIGS. 1 and 2, the diameter (diameter) of the expanded portion 130 of the pulverized coal uniform supply means of the present invention is relatively larger than the diameter of the connecting pipe 112 (inlet conduit or feed line) The flow rate of the pulverized coal flowing into the tube portion 130 via the connection pipe 112 (or the supply line 110) instantaneously drops from the expansion portion, so that the pulverized coal is temporarily stagnated .

Therefore, the pulverized coal (FC) flowing into the expanding portion (130) can be further mixed with the pulverized coal (FC) entering in the downstream direction, and more sufficient mixing of the pulverized coal in the expanded portion can be performed by the pulverized coal intake lance 50, a certain amount of pulverized coal is blown in a state where the mixture uniformity is good, and as a result, the operating atmosphere of the blast furnace is kept to be optimum.

On the other hand, in FIG. 8, the inventor observed that unburnt pulverized coal was generated in the blast furnace even if the amount of the fine pulverized coal suitably calculated in accordance with the amount of coke and iron ore charged through the furnace of the blast furnace 10 was blown into the blast furnace As a result of the research, it is shown that the blowing amount of the pulverized coal injected into the blast furnace is not constant.

1, even when a predetermined amount of pulverized coal (FC) is supplied from the pulverized coal supply hopper 190 to the supply line 110, the pulverized coal (pulverized coal) The amount of pulverized coal discharged through the intake lance 50 is not constant over time, which is due to the flow characteristics of the pulverized coal flowing in the feed conduit.

That is, referring to FIG. 8, the total blown amount of the fine coal which is appropriately calculated in accordance with the amount of coke and iron ore to be charged into the furnace is equal to a predetermined reference blow amount W1 until the reference time t1 as indicated by the dotted line Can be calculated as the sum of the amount of blown when blown. However, the actual blown amount of the pulverized coal injected into the furnace until the reference time t1 shows a deviation on the basis of the reference blown amount W1 as indicated by the solid line, so that the pulverized coal having the reference blown amount W1 or more is blown Or unevenness occurs at the time of blowing, pulverized coal in an unburned state is generated, which causes the above-described problems.

Therefore, as shown in FIG. 1 and FIG. 2, the pulverized coal supply device 1 of the present invention includes the expanded portion 130 of the pulverized coal uniform supply means, so that the pulverized coal intake amount of the pulverized coal is constant So that a certain amount of pulverized coal is blown into the blast furnace through the pulverized coal blowing lance 50. [

3 and 4, the expanded portion 130 of the present invention, which expands the pulverized coal receiving space, includes a pulverized coal supply line 110 connected to the pulverized coal supply hopper 112, Circular, circular, polygonal, conical, or the like, which is connected between the connecting pipes 112 on the side of the connecting portion 50,

For example, the quadrangular corolla 132 of FIG. 3 can maximize the interior of the internal pulverized coal receiving space, thereby making it possible to uniformly distribute the pulverized coal in a predetermined amount into the blast furnace.

4, the diameter of the conical expanding portion 130 gradually narrows toward the pulverized coal outlet 132 of the expanded portion after expansion of the inflow space, so that the pulverized coal can be discharged smoothly.

However, considering the production conditions and the discharge conditions through the outlet of the expansion part and the like, it is preferable that the ellipse of the polygonal shape as shown in Fig. 2 or the circular shape as shown in Fig. 5 is used. However, Of course, is spherical.

1 and 2, at least one high-pressure gas inlet pipe 150 may be connected to the expanded portion 130 of the pulverized coal uniform supply means of the present invention, and the high-pressure gas inlet pipe 150 may be connected to the high- Preferably one or two, in the upper and lower sides.

Accordingly, the high-pressure gas inlet pipe 150 provided in the pipe-expanding portion 130 of the present invention can uniformly mix pulverized coal inside the pipe-expanding portion and smoothly discharge the same through the outlet 132, ), Or to control the injection amount or the velocity of the high-pressure gas so as to realize an optimum condition for blowing the fine coal into the blast furnace.

That is, a plurality of the high-pressure gas inlet pipes 150 may be arranged in the expanded pipe section 130 in a predetermined pattern, but they may be arranged in the expanded pipe section inclined toward the pulverized coal outlet 132 of the expanded pipe section 130 It would be most desirable to be connected.

2, the high-pressure gas supply pipe 150 is provided with electric operation control valves V, which are connected to the device control unit C, and the device control unit C Is connected to the pressure gauge P provided on the downstream side connection pipe 112 to the expansion side and the device control unit C is connected to the blowing B connected to the high pressure gas supply pipe 150 .

Accordingly, the operation of the blowing B is controlled through the device control unit according to the internal pressure of the connection pipe detected on the downstream side of the outlet of the expansion unit, and the opening degree of the control valve V provided in the high-pressure gas supply pipe is controlled The supply of high-pressure gas can also be controlled.

As a result, in the case of the apparatus of the present invention, it is possible to control the pulverized coal to be introduced into the blast furnace through the high-pressure gas supply pipe 150 optimally with a uniform distribution and amount as well as a flow rate and a speed.

1 to 4, the pulverized coal (FC) supplied from the pulverized coal supply hopper 190 by the high-pressure conveyed air is supplied to the supply line 110 And the flow rate of the pulverized coal which is not constant due to the flow characteristics in the supply line is reduced by the amount of flow of the pulverized coal through the connection pipe 112 (inlet pipe) The flow rate is temporarily decreased, and the mixture of the preceding pulverized coal and the trailing pulverized coal is increased, thereby reducing the flow amount deviation.

Next, while the pneumatic gas is introduced into the expansion portion 130 through the supply pipe 150, the mixing efficiency of the pulverized coal introduced into the expansion portion can be improved to enable a more uniform blowing into the blast furnace, Thereby improving the discharge of the pulverized coal and the blowing performance of the blast furnace.

5 shows another embodiment of the pulverized coal drawing device 1 of the present invention. For example, the high-pressure gas inlet pipe 150 installed in the pipe-expanding portion 130 is connected to the high-pressure gas inlet pipe 152) and a reverse high-pressure gas inlet pipe (154).

At this time, the forward high-pressure gas supply pipe 152 is directed to the outlet 132 of the expansion unit, and the reverse high-pressure gas supply pipe 154 is directed to the opposite direction.

Therefore, the high-pressure gas A1 or A2 injected from these supply pipes collides with force inside the expansion portion, and as a result, a severe vortex is forcibly generated, thereby maximizing the pulverized coal mixing property inside the expansion portion.

Preferably, the pressure or flow rate of the high-pressure gas A1 injected into the forward-direction high-pressure gas supply pipe 152 is higher than that of the reverse-direction high-pressure gas introduction pipe 154 so as to smoothly discharge the mixed powdery coal 132 from the outlet 132 And a certain amount of high-pressure gas is discharged to facilitate the discharge.

At this time, the first and second control valves V1 and V2 provided in the long-direction and reverse-direction high-pressure gas supply pipes are appropriately opened and controlled in association with the device control unit C as described above, It is needless to say that the injection can be controlled.

6, there is shown another embodiment of the apparatus of the present invention. For example, the inside of the connection pipe 112 (discharge pipe) (supply line) connected to the pulverized coal outlet 132 of the pipe- Is provided with vortex generating means (170) for forcibly colliding the pulverized coal with the high pressure gas.

6, the vortex generating means 170 is provided with a connecting rod 176 between the cruciforms 175 of the mold 174 fastened to the connecting flange F of the tube, Or collision rods 172 in a predetermined pattern.

Accordingly, as shown in FIG. 6, the pulverized coal (high-pressure gas) discharged from the outlet 132 through the expanding portion 130 collides with the impingement rods 172 while being forcedly vortexed, And is blown into the blast furnace so as to increase its combustion property.

As a result, the vortex generating means 170 of the present invention shown in Fig. 6 maximizes the pulverized coal mixing performance, thereby making it possible to more reliably remove unburned coal.

Meanwhile, although it is shown schematically in the drawing, it is a matter of course that the pulverized coal supply line, the connecting tube and the light exposing portion of the present invention must be prevented from leaking out of the pulverized coal through packing or the like.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be understood by those skilled in the art that it is easy to know.

1 .... Pulverized coal supply system of high temperature 10 .... Blast furnace
30 .... Tungsten 50 .... Pulverized coal blowing nozzle
110 .... Pulverized coal supply line 130 .... Expanded part
132 .... Expansion pipe outlet 150 .... High pressure gas supply pipe
170 .... Vortex generating means 190 .... Pulverized coal supply hopper

Claims (9)

A pulverized coal supply line 110 connected to the pulverized coal receiving lance 50 provided on the side of the tuyere 30 of the blast furnace 10; And
A pulverized coal uniform supply means provided uniformly at the pulverized coal blast blowing at least one point of the pulverized coal supply line;
Wherein the blast furnace is provided with a blast furnace.
The method according to claim 1,
The pulverized coal uniform supply unit may include an expansion unit 130 provided in the pulverized coal supply line and extending the pulverized coal receiving space beyond the supply line.
Wherein the pulverized coal is supplied to the furnace.
3. The method of claim 2,
Wherein the expansion portion (130) is formed of one of circular, round, polygonal, and conical shapes connected in cross section to a pulverized coal supply line (110) connected to the pulverized coal supply hopper (112).
4. The method according to any one of claims 1 to 3,
A high pressure gas inlet pipe (150) connected to at least one of the expansion parts (130) and smoothly blowing fine coal into the blast furnace;
Further comprising the step of supplying the pulverized coal to the blast furnace.
5. The method of claim 4,
Wherein a plurality of high-pressure gas introduction pipes (150) are connected to the expansion parts in a predetermined pattern, and are provided so as to inject high-pressure gas toward the granular coal outlets (132) of the expansion parts.
5. The method of claim 4,
The high-pressure gas inlet pipe (150) includes a forward high-pressure gas inlet pipe (152) and a reverse high-pressure gas inlet pipe (154) provided to increase the mixing property of the pulverized coal through the vortex generation by colliding with the high- ),
Wherein the high-pressure gas introduction pipe introduces high-pressure gas at a higher pressure or flow rate than the reverse high-pressure gas introduction pipe.
4. The method according to any one of claims 1 to 3,
A vortex generating means 170 provided on the downstream side of the pulverized coal outlet 132 of the expanded portion to induce the generation of vortex due to the collision of the pulverized coal to thereby further improve the mixing performance of the pulverized coal;
Further comprising the step of supplying the pulverized coal to the blast furnace.
8. The method of claim 7,
The vortex generating means 170 includes a collision rod 172 provided between the bending portion 130 and the pulverized coal blowing lance 50 and provided inside the connection pipe or the supply line;
And a plurality of blast furnace blast furnaces.
5. The method of claim 4,
The pulverized coal supply line 110 is connected to the pulverized coal supply hopper 190 and the high pressure gas supply pipe 150 is connected to the high pressure gas supply blowing B and is connected to the pressure gauge P Characterized in that a control valve (V) associated with the associated device control (C) is provided.

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