KR102307704B1 - Apparuatus for removing dust in blast furnace gas - Google Patents

Abstract

The present invention relates to an apparatus for removing dust from a blast furnace gas for operating a furnace top pressure generator, and the apparatus for removing dust from a blast furnace gas according to an embodiment of the present invention is provided in a pipe through which the blast furnace gas is transported. It may include a two-fluid nozzle in which the mixed solution inlet through which the mixed solution mixed with the removing water and the dispersing agent is introduced and the steam inlet through which the steam is introduced are located separately from the mixed solution inlet.

Description

Dust removal device in blast furnace gas TECHNICAL FIELD

The present invention relates to an apparatus for removing dust in a blast furnace gas for operating a furnace top pressure generator.

Blast furnace gas (BFG) generated in a blast furnace plant of an ironworks is generally removed from dust by a cyclone method in a dry dust catcher for refining and is then referred to as a bischoff scrubber or bishop. ), and the remaining dust is collected.

Specifically, the dust in the blast furnace gas supplied to the top gas pressure recovery plant (hereinafter, TRP) is removed as follows.

First, dust having a large particle size (or dust of granules) existing in the blast furnace gas is removed by a dry dust collector. And the fine dust remaining in the blast furnace gas is removed by spraying cooling water to which a coagulant, which is a polymer component, is mainly added in the bishop scrubber.

The dust-removed blast furnace gas as described above is attracted to the furnace top pressure generator and then turns the top gas pressure recovery turbine (TRT) to generate power.

At this time, ultrafine dust that has not been removed in the blast furnace gas may be supplied to the top pressure turbine of the furnace top pressure generator together with the blast furnace gas. If the dust content in the blast furnace gas is higher than the design value, the dust in the blast furnace gas is coated with the water removal water by spraying the blast furnace gas using the water removal water. The dust coated in this way is attached to the blade of the furnace top pressure turbine and then flows down and can be removed.

However, at this time, the dust removal particles are relatively larger than the fine dust particles in the blast furnace gas. As described above, the large size of the water removal particles reduces the collecting power of the water removal water for fine dust. Accordingly, a significant amount of the fine and/or ultrafine dust that is not removed into the top pressure turbine in the top pressure generator will adhere to the blades of the top pressure turbine. In particular, since the blast furnace gas that has passed through the bishop scrubber contains a coagulant added to the collecting water of the bishop scrubber, it is easier to attach to the blades of the furnace top pressure turbine. As a result, the dust attached to the turbine blades as described above causes erosion and/or wear of the turbine blades, resulting in a decrease in the power generation capability of the adjustable pressure generator.

On the other hand, since the conventional method using only water-removing water requires the use of a very large amount of water-removing water, it causes cost and/or environmental problems according to the wastewater regeneration treatment of the water-removing water. In addition, the method of using only steam to remove fine dust requires energy and cost for generating steam, so there is a problem in itself that the economic feasibility is lowered.

An object of the present invention is to provide an apparatus for preventing dust from adhering to a turbine blade of a furnace top pressure generator by collecting and removing dust in a blast furnace gas.

Another object of the present invention is to provide an apparatus capable of increasing the power generation output of the furnace top pressure generator by increasing the temperature of the blast furnace gas supplied to the furnace top pressure generator.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, an apparatus for removing dust in a blast furnace gas according to an embodiment of the present invention is located in a pipe through which the blast furnace gas is transported, a mixed solution inlet through which a mixed solution mixed with water removing water and a dispersing agent is introduced, and steam is introduced The steam inlet to be used may include two fluid nozzles located separately from the mixed solution inlet.

Preferably, the two fluid nozzles may be located in a vertical pipe.

Preferably, it may further include a drain port located in the lower portion of the two fluid nozzles in the vertical pipe.

In addition, it may further include a two-fluid nozzle in which the water-removing water inlet and the steam inlet through which the steam is introduced are located separately from the water-removing water inlet.

In this case, the second fluid nozzle including the water removal inlet and the steam inlet may be located in a horizontal pipe.

Preferably, the second fluid nozzle including the water-removing water inlet and the steam inlet may be positioned at the front and/or rear of the control valve positioned in the horizontal pipe with respect to the transport direction of the blast furnace gas.

More preferably, a furnace top pressure turbine may be positioned at the rear of the control valve based on the transport direction of the blast furnace gas.

According to the present invention, the dust particles in the blast furnace gas can be made smaller by steam than the dust particles in the blast furnace gas. As a result, the dust collecting power of the dewatering water or the mixed solution is improved, and the dust contained in the blast furnace gas can be more effectively removed. Therefore, it is possible to reduce the dust attached to the furnace top pressure turbine, thereby greatly reducing the erosion and/or wear of the turbine.

In addition, according to the present invention, the clogging of the nozzle hole can be reduced by injecting the mixed solution or water and steam into the inlet of the nozzle, respectively.

In addition, according to the present invention, since the mixed solution or water removal water is blown by steam, the fork spray effect can be further increased.

Furthermore, according to the present invention, the size of the nozzle hole can be increased due to the blowing effect by steam, and as a result, the amount of spraying during the same time can be increased, so that the dust suppression effect of the dust in the blast furnace gas can be improved.

In addition, according to the present invention, it is possible to prevent the temperature decrease of the blast furnace gas by steam, thereby improving the power generation efficiency of the furnace top pressure generator.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is an overall schematic view of a blast furnace facility including an apparatus for removing dust in a blast furnace gas according to an embodiment of the present invention.
2 is a facility configuration diagram of a blast furnace top pressure generator of the prior art.
Figure 3 is a block diagram of a water repellent spray in a blast furnace top pressure generator facility of the prior art.
4 is a block diagram of a water repellent spray in a blast furnace top pressure generator facility including a dust removal device in a blast furnace gas according to an embodiment of the present invention.
5 is a view showing a cross-sectional structure of a second injection nozzle in the apparatus for removing dust in blast furnace gas according to an embodiment of the present invention.

Hereinafter, with reference to the drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are given to the same or similar elements throughout the specification. Further, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the nature, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It will be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

In addition, in implementing the present invention, components may be subdivided for convenience of description, but these components may be implemented in one device or module, or one component may include a plurality of devices or modules. It may be implemented by being divided into .

1 is an overall schematic view of a blast furnace facility including an apparatus for removing dust in a blast furnace gas according to an embodiment of the present invention.

As shown in FIG. 1 , the blast furnace facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention removes the blast furnace 1 and particle dust in the blast furnace gas discharged from the blast furnace gas from the blast furnace gas. It may include a cyclone-type dust catcher 2 for removing the dust and a bishop scrubber 20 which is a wet dust collector for removing fine dust in the blast furnace gas from which the particle dust has been removed.

Meanwhile, the conventional blast furnace facility may also include the blast furnace 1 , the dust catcher 2 , and the bishop scrubber 20 in the same manner as in the embodiment of the present invention.

The blast furnace gas from which the dust has been removed by the bishop scrubber 20 is transferred to the furnace top pressure generator (TRP).

2 is a facility configuration diagram of a blast furnace top pressure generator of the prior art.

First, as shown in FIG. 2 , in the conventional blast furnace top pressure generator, the blast furnace gas 3a is introduced into the furnace top pressure generator 9 through the inlet vertical pipe 5 on the left side of FIG. 2 . Specifically, the blast furnace gas 3a first passes through the inlet valve 10, the inlet shutoff valve 11, the control shutoff valve 12, and the control valve 14 located on the inlet side of the furnace top pressure generator 9, and then the furnace top pressure generator. (9) is introduced.

The blast furnace gas 3a flowing into the furnace top pressure generator 9 rotates the blades of the furnace top pressure generator turbine 8 . Thereafter, the furnace top pressure generator turbine 8 transmits rotational force to the generator 7 connected to the furnace top pressure generator turbine 8 , so that electricity can be produced in the generator 7 .

The blast furnace gas 3a which rotates the furnace top pressure generator turbine 8 in this way goes out to the outside of the furnace top pressure generator 9 through the outlet valve 15 again.

On the other hand, the blast furnace gas 3a before flowing into the inlet valve 10 passes through the bishop scrubber and controls the water level in the drain port 19 and the drain port 19 for separating the water contained therein. It may include a drain port level adjustment valve (19a) for this.

In addition, in the conventional blast furnace top pressure generator 9, the bypass valve 16 and the bypass valve through which the blast furnace gas 3a is bypassed without going through the furnace top pressure generator turbine 8 of the furnace top pressure generator 9 if necessary It may further include a bypass control valve (17) for regulating (16).

Figure 3 is a block diagram of the spraying water (30a) in the blast furnace top pressure generator of the prior art.

In the conventional furnace top pressure generator facility, in order to remove the fine mist that is difficult to be removed even by the bishop scrubber 20, the removal water 30a may be supplied to the blast furnace gas 3a introduced through the inlet vertical pipe 5.

Specifically, in the related art, the liquid removal water 30a may be supplied through a nozzle or the like before the blast furnace gas 3a flows into the furnace top pressure turbine 8 of the furnace top pressure generator 9 .

More specifically, in the related art, the liquid water removal water 30a having a fresh water component is removed near the control valve 14 located on the inlet side of the furnace top pressure turbine 8 based on the movement path of the blast furnace gas 3a. It may be supplied to the blast furnace gas 3a through the supply line 30 .

In this case, a nozzle may be used as a means for supplying the water removal water 30a to the blast furnace gas 3a, but the present invention is not limited thereto.

In addition, the water removal water 30a may be supplied to the blast furnace gas 3a from the front and/or rear of the control valve 14 based on the transport path of the blast furnace gas 3a, but is not limited thereto. However, for more efficient and stable removal of fine dust, it is preferable that the water removal water 30a is supplied to the blast furnace gas 3a at a plurality of positions based on the movement path of the blast furnace gas 3a. In addition, even if the damping water 30a is supplied at a plurality of positions, at least one position to which the damping water 30a is supplied is a control valve 14 so as to be close to the furnace top pressure turbine 8 of the furnace top pressure generator 9 . It is more preferable to be located at the rear end.

Furthermore, it is preferable that a plurality of first fluid nozzles 31 installed at a plurality of positions at which the water-removing water 30a is supplied to the blast furnace gas 3a are installed at each of the locations where the water-removing water 30a is supplied. This is because there is a higher possibility that the fine mist in the gaseous blast furnace gas 3a is captured by the water removal water 30a.

Also, as shown at the bottom of FIG. 3 , in the first fluid nozzle 31 , only the fresh water component removal water 30a is supplied to the inlet (inlet) of the first fluid nozzle 31, so that the As the first fluid nozzle, one fluid nozzle including only one supply part in the inlet is sufficient.

However, since the first fluid nozzle 31 receives only the freshwater component removing water 30a, one fluid nozzle such as the first fluid nozzle 31 has a hole in the nozzle to form a fog spray. ) is very fine. Therefore, impurities in the fresh water not only easily close the hole of the nozzle, but furthermore, when the fog spray is formed, the temperature of the blast furnace gas 3a is lowered due to the low temperature of the fresh water removing water 30a when the fog spray is formed. causes

On the other hand, as described above, the blast furnace gas 3a in which the fine mist is collected by the suppression water 30a is introduced into the furnace top pressure turbine 8 in the furnace top pressure generator 9 .

Specifically, the blast furnace gas 3a in which the fine dust is collected is first the first stage blade 34 of the stator of the furnace top pressure turbine 8, the first stage blade 35 of the rotor, and the second stage blade of the stator ( 36) and the second stage blade 37 of the rotor pass in turn to exit the furnace top pressure turbine 8. If the number of blades of the stator and rotor 33 of the furnace top pressure turbine 8 is two or more, the blast furnace gas 3a rotates each blade while passing through all of the two or more blades.

4 is a block diagram of a spraying water removal water 30a in a blast furnace top pressure generator facility including a dust removal device in a blast furnace gas according to an embodiment of the present invention.

The blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention uses a mixed solution including a dispersant in the form of a mist in addition to the water removal water 30a, unlike the prior art, in order to remove fine mist. characterized in that Furthermore, the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention is technically characterized in that it includes a separate configuration for producing and spraying the mixed solution. Furthermore, in the blast furnace top pressure generator facility including the device for removing dust in the blast furnace gas according to an embodiment of the present invention, instead of one fluid nozzle using only the existing water removal water 30a, one fluid is used to remove water 30a and another Another technical feature is to prevent clogging of the nozzle hole and lowering of the temperature of the blast furnace gas 3a by using a two-fluid nozzle using steam 38a as one fluid.

Hereinafter, a blast furnace top pressure generator facility including a dust removal device in blast furnace gas according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4 .

As shown in FIG. 4 , the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention is installed in the inlet vertical pipe 5 through which the blast furnace gas 3a is introduced. and a second fluid nozzle 32-1 for spraying the mixed solution 39 containing steam 38a, fresh water component removing water 30a, and dispersing agent to the blast furnace gas 3a.

In particular, when the second fluid nozzle 32-1 is located in the inlet vertical pipe 5, the mixed solution 39 in which fine and/or ultrafine dust is collected by the second fluid nozzle 32-1. may be accumulated by falling into the drain port 19 located at the bottom of the inlet vertical pipe 5 by falling under its own weight. Through this, there is an advantage in that the separation and discharge of the dust removal water 30a that has collected the dust becomes easy even if a separate device is not added.

At this time, as shown in FIG. 5, the second fluid nozzle 32-1 has a mixed solution inlet through which the mixed solution 39 in which the water removing water 30a and the dispersing agent are mixed is introduced into the inlet of the nozzle. A two-fluid nozzle in which the inlet of the steam 38a through which the steam 38a is introduced is separately located is preferable. The mixed solution 39 and steam 38a respectively introduced into the inlet are mixed inside the second fluid nozzle and then through the outlet of the second fluid nozzle 32-1 inside the blast furnace gas 3a. is sprayed with

In particular, since the second fluid nozzle 32-1 is a two-fluid nozzle type, the mixed solution 39 is blown by the steam 38a at high temperature (typically 150 to 200° C.), so the possibility of nozzle hole clogging is significantly reduced. There is an advantage that the fog spray effect can be made larger.

In addition, due to the blowing effect by the steam 38a, the two-fluid nozzle type may increase the size of the nozzle hole rather than the one-fluid nozzle type. This not only prevents clogging of the nozzle hole, but also increases the amount of spraying during the same time, which further improves the damping effect.

Accordingly, the particles of the mixed solution 39 dispersed and misted through the second fluid nozzle 32-1 become smaller in size than the dust inside the blast furnace gas 3a by the dispersant and the steam 38a. As a result, the particles of the mixed solution 39 have improved dust collecting power, so that the dust contained in the blast furnace gas 3a can be effectively removed. Accordingly, the blast furnace gas 3a from which the dust has been removed according to an embodiment of the present invention can dramatically reduce the amount of dust attached to the blades of the furnace top pressure turbine 8 of the furnace top pressure generator 9 .

In addition, in the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention, since the steam 38a is included in the blast furnace gas 3a, the temperature of the blast furnace gas 3a is lowered and further The temperature of the blast furnace gas 3a can be raised. As a result, in the blast furnace top pressure generator 9 according to an embodiment of the present invention, the power generation output is improved.

Referring back to FIG. 4 , as a non-limiting and specific example, the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention includes the second injection nozzle 32-1. The mixed solution 39 and the steam 38a containing the dispersant introduced into the can be supplied as follows.

First, the mixed solution 39 containing the dispersant is supplied with the fresh water component 30a used as a solvent of the mixed solution through the water removal water 30a supply line 30 . The water removal supply line 30 may further include a fresh water supply valve V4 for controlling and opening and closing the supply amount.

Meanwhile, the dispersant included in the mixed solution 39 is supplied through the dispersant supply line 44 . At this time, the dispersant supply line 44 includes a dispersant tank 43 in which the dispersant is stored, a dispersant supply pump 42 for supplying a dispersant from the dispersant tank 43, and a dispersant supply pump discharge valve V5. can

As described above, the water-removed water 30a supplied from the water-removing water 30a supply line 30 and the dispersant supplied from the dispersant supply line 44 may be diluted to a predetermined concentration and stored in the mixed solution tank 41 . Meanwhile, the mixed solution tank 41 and the dispersant tank 43 may include a mixed solution tank level gauge L1 and a dispersant tank level gauge L2 to check the water level, respectively.

The diluted mixed solution 39 is supplied to the inlet of the second fluid nozzle 32-1 through the mixed solution supply pump 46 and the mixed solution supply pump valves V2 and V3.

Meanwhile, it is preferable that the steam 38a supplied to the second fluid nozzle 32-1 has a separate supply line from the mixed solution supply line.

For the production of steel, melting and heating processes are usually essential. In the course of the melting and heating process, a lot of steam 38a is generated, and although some steam 38a is reused for other purposes, there is also a lot of discarded steam 38a.

Accordingly, in the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention, the steam 38a generated in the other process is recovered without being discarded and the second fluid nozzle 32 By supplying the steam 38a of -1) to the inlet port, it is possible to not only promote misting of the mixed solution 39, but also increase power generation efficiency.

On the other hand, the steam 38a in the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention is a non-limiting and specific example, and the steam 38a is produced through a separate steam line 38 . 2 may be supplied to the fluid nozzle 32-1. Also, if necessary, a steam valve v38 may be provided in the steam line 38 of the steam 38a.

Furthermore, in the blast furnace top pressure generator facility including the dust removal device in the blast furnace gas according to an embodiment of the present invention, the top pressure turbine 8 of the furnace top pressure generator 9 is based on the transport direction of the blast furnace gas 3a. ) may include a second fluid nozzle 32-2 in the form of two fluid nozzles in addition to the front and/or rear of the control valve 14 located on the inlet side.

However, the second fluid nozzle 32-2 has a configuration of two fluid nozzles that are mechanically identical to the second fluid nozzle 32-1, but the second fluid nozzle 32-2 is a fluid introduced into the inlet. is different from the second fluid nozzle 32-1.

Specifically, the blast furnace gas 3a passing through the inlet vertical pipe 5 meets the second fluid nozzles 32-2 through the horizontal pipe 5-1. At this time, the second fluid nozzles 32-2 connect the water suppression water inlet and the steam supply line 38 into which the water suppression water 30a supplied through the existing water suppression water 30a supply line 30 is injected as an inlet. It includes a steam inlet through which the supplied steam 38a is injected.

Accordingly, the second fluid nozzles 32-2 blow the water removal water 30a into the blast furnace gas 3a in the form of fog spray by the steam 38a, and thereby Residual flocculant components and residual dust are removed. In addition, since the temperature of the blast furnace gas 3a passing through the second fluid nozzles 32-2 is increased by the steam 38a, the heat lost to the surroundings when the blast furnace gas 3a is transported is transferred to the steam 38a by the steam 38a. can be restored As a result, the clean blast furnace gas 3a with a higher temperature is supplied to the furnace top pressure turbine 8 of the furnace top pressure generator 9, so that power generation efficiency can also be improved.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, even if the effect of the configuration of the present invention is not explicitly described and described while describing the embodiment of the present invention, it is natural that the effect predictable by the configuration should also be recognized.

1: Blast furnace
2: Dust Catcher
3a: blast furnace gas
4: furnace top pressure generator equipment
5: Inlet vertical pipe
5-1: Horizontal piping
6: Blast furnace gas holder
7: Generator
8; furnace top pressure generator turbine
9: furnace top pressure generator
10: inlet valve
11: Inlet shutoff valve
12: control shut-off valve
14: control valve
15: outlet valve
16: bypass valve
17: bypass control valve
18;Seal Tank;
18a; seal tank level control valve,
19: drain port
19a: drain port level adjustment valve
20: Bishop Scrubber
30: water suppression supply line
30a: Jinsoo
31: first fluid nozzle
32-1, 23-2: second fluid nozzle
33: rotor
34: first stage blade
35: first stage blade of the rotor
36: second stage blade of the stator
37: second stage blade of the rotor
38: steam line
38a: Steam
39: mixed solution
41: mixed solution tank
42: dispersant feed pump
43: dispersant tank
44: dispersant supply line
46: mixed solution supply pump
V2, V3: Mixture supply pump valve
V4: fresh water supply valve
V5: Dispersant supply pump discharge valve
V38: Steam valve
L1: tank level gauge
L2: dispersant tank level gauge

Claims (7)

It is located in the pipe through which the blast furnace gas is transported,
A mixed solution inlet through which the mixed solution of the water removing water and the dispersing agent is introduced;
2 fluid nozzles (32-1) in which the steam inlet through which steam is introduced is located separately from the mixed solution inlet;
The two fluid nozzles 32-1 are located in the vertical pipe,
Dust removal device in blast furnace gas.
delete According to claim 1,
Further comprising a drain port located below the two fluid nozzles in the vertical tubing,
Dust removal device in blast furnace gas.
According to claim 1,
A water-removing water inlet through which water-repellent water flows, and
Further comprising; a steam inlet through which steam is introduced, a two-fluid nozzle (32-2) which is located separately from the water suppression inlet;
Dust removal device in blast furnace gas.
5. The method of claim 4,
The two-fluid nozzle 32-2, in which the water-removing water inlet through which the water-removing water is introduced, and the steam inlet through which the steam is introduced, is located separately from the water-removing water inlet, is located in a horizontal pipe,
Dust removal device in blast furnace gas.
6. The method of claim 5,
The two-fluid nozzle 32-2, in which the water-removing water inlet through which the water-removing water is introduced, and the steam inlet through which the steam is introduced, is located separately from the water-removing water inlet, is a control valve located in the horizontal pipe in the direction of transport of the blast furnace gas. Located in front and / or rear with respect to
Dust removal device in blast furnace gas.
7. The method of claim 6,
A furnace top pressure turbine is positioned behind the control valve with respect to the transport direction of the blast furnace gas,
Dust removal device in blast furnace gas.

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