KR100910498B1 - An apparatus for removing dust in the ejector of rh system - Google Patents

Abstract

When the vacuum chamber is pressed down, the molten steel is raised and lowered in the vacuum chamber according to the degree of vacuum, thereby providing a device for removing dust stuck in the ejector in the vacuum degassing equipment (Reinstahl Huten Werke Heraus, RH), which is made of high clean steel. do.

The dust removal apparatus 1 in the ejector of the vacuum degassing facility is connected to the supply pipe 144 of the steam injection nozzle 140 of the vacuum degassing line L and has a connection pipe 10 having a pump 12 ( 14); And, connected to the connecting pipe 14, the water supply pipe 20 and the steam pipe 30 is connected, respectively, the steam nozzle head 32 is connected to the steam pipe 30 is provided therein Hydrothermal tank 40; And an electromagnet hammer 50 installed on at least one outside of the line ejector 130 to remove the fixing dust D in the ejector through hot water.

According to the present invention, by using the existing equipment to effectively remove the dust (Dust) stuck in the ejector (ejector) of the degassing equipment (RH), as well as additional equipment cost and, in particular, the effective removal of the dust can be removed vacuum An improved effect can be obtained which further improves the utilization rate of the gas plant.

Vacuum Degassing Equipment (RH), Ejector, Steam Spray Nozzle, Dust, Dust Removal Device in Ejector

Description

Dust removal device in ejector of vacuum degassing facility {AN APPARATUS FOR REMOVING DUST IN THE EJECTOR OF RH SYSTEM}             

1 is a schematic diagram showing a general vacuum degassing apparatus

2 is a schematic view showing dust stuck in an ejector of a vacuum degassing plant;

Figure 3 is a perspective view showing the fixing dust removal apparatus in the ejector of the conventional vacuum degassing equipment

Figure 4 is a perspective view showing the dust removal apparatus in the ejector of the vacuum degassing equipment according to the present invention

Figure 5 is a flow chart showing the operation step of the dust removal apparatus in the ejector of the present invention vacuum degassing equipment

Explanation of symbols on the main parts of the drawings

1 .... adherence dust removal device 10,14 ... connector

12 .... Pump 20 .... Water Supply Line

30 .... Steam pipe 32 .... Steam nozzle head

32a .... Nozzle 40 .... Hot Water Tank

50 .... Electromagnet Hammer 60 .... Sensor                 

10a, 14a, 22,34,144a .... solenoid valve

130 .... Ejector 140 ... Steam Injection Nozzle

D .... Securing Dust L .... Vacuum Degassing Line

The present invention relates to a device for removing dust stuck in the ejector in a vacuum degassing facility (RH) made of high clean steel as the molten steel is raised and lowered in the vacuum chamber according to the degree of vacuum when the vacuum chamber is pressed down. More specifically, by injecting hot water at an appropriate temperature through a conventional steam spray nozzle which injects steam into a vacuum chamber to form an internal vacuum of the vacuum degassing equipment, a degassing equipment ejector using an existing equipment is used. The present invention relates to an apparatus for removing dust in an ejector of a vacuum degassing plant that can effectively remove dust stuck in the inside, thereby improving an operation rate of the vacuum degassing plant by effectively removing dust while reducing additional equipment costs.

One of the facilities for manufacturing high clean steel in steel mills is the vacuum degassing equipment (Reinstahl Huten Werke Heraus, RH). When the vacuum degassing equipment is forced into the vacuum tank, the molten steel rises into the vacuum tank according to the vacuum degree. In order to ensure the quality required by the demand during the vacuum degassing operation, it is necessary to manage the vacuum in the vacuum chamber to the highest vacuum close to the absolute vacuum.

In other words, it is easy to remove the gas in the molten steel under high vacuum conditions, if the vacuum condition is poor during the degassing process, the quality of the product is deteriorated, and the molten steel under treatment must be filtered all the way, so that of course cost loss, It is difficult to comply with the delivery time of the product due to low productivity, Figure 1 schematically shows such a vacuum degassing equipment.

That is, as shown in FIG. 1, when the vacuum chamber 110 is covered in a state in which a vacuum is formed closely to the upper portion of the ladle 100, the molten steel (m) is formed through the deposition tube 120 below the vacuum chamber 110. ) Is circulated and degassed.

Meanwhile, as shown in FIG. 1, a method of forming a vacuum in the vacuum degassing apparatus includes a steam injection nozzle mounted inside the ejector 130 having a Venturi tube type during vacuum degassing. When steam is supplied and injected at a pressure of about 7 to 8 bar, the suction force is generated in a direction in which steam is injected, and the vacuum is formed while the inside of the vacuum chamber 110 is exhausted.

Then, the steam injected through the steam injection nozzle 140 reaches the condenser 150, by spraying the cooling water in the condenser 150 to liquefy the steam forcibly, a vacuum is formed by the size of the volume decreases at this time The vacuum is maintained as this series of steps proceeds continuously. At this time, the steam injection nozzle 140 may include a supply pipe 144 and the nozzle port 142 as shown in FIG.

That is, since the high-pressure steam is continuously injected through the nozzle 140 from the line L connected to the vacuum chamber 110 through the nozzle 140, a high-accuracy vacuum is formed on the vacuum chamber 110 side.

However, as shown in FIG. 2, since the ejector 130 has the narrowest inner diameter S in the degassing line L, dust D, which is a foreign matter generated during vacuum degassing, is easily attached. While the firming hardening dust is generated, such as the fixing dust (D) in the ejector 130 causes a problem that is the main cause of poor vacuum degree in the vacuum degassing equipment, which is the demand during vacuum degassing operation It is difficult to manage the vacuum degree to ensure the quality required by the family.

Meanwhile, FIG. 3 illustrates an apparatus 200 for removing the fixed dust D formed on the ejector 130 of the vacuum degassing line L, and the conventional fixed dust removing apparatus 200 is illustrated. ) Is installed in the moving body 220, the lifting weight 230 is inserted into the ejector 130 as the motor 210 ascending and descending, while rotating by the operation of the other motor 240 of the vacuum degassing line (L) Fixing dust (D) in the ejector 130 was pulverized.

However, in the conventional ejection fixing dust removal device 200, such as the first separate removal device 200 must be manufactured and installed and maintained, so additional costs are incurred, and the ejector of the removal device 200 130 is installed in the airtight need to maintain the vacuum degree unstable for a long time use, the second dust (D) in the fixed state, even if hitting the removal weight 230, only the dust of the hitting part is removed, There were several problems, such as the time required to remove D), which lowered the degassing operation rate during the operation.

Accordingly, it may be desirable to remove the internal fixation dust D of the ejector 130 using the existing vacuum degassing equipment.

The present invention has been made in order to improve the various problems as described above, the object of the present invention is to provide a hot water at an appropriate temperature through the existing steam injection nozzle for injecting steam into the vacuum chamber for the internal vacuum formation of the vacuum degassing equipment By spraying, it is possible to effectively remove the dust (D) stuck in the degassing equipment ejector by using the existing equipment. The vacuum degassing equipment improves the operation rate of the vacuum degassing equipment by effectively removing dust while reducing the additional equipment cost. The present invention provides a dust removal device in an ejector.

As a technical configuration for achieving the above object, the present invention is installed in a vacuum degassing line in the ejector and steam injection nozzle for the vacuum formation of the equipment vacuum tank,

A connection pipe connected to the supply pipe of the steam injection nozzle and having a pump;

A hot water tank connected to the connection pipe, the water supply pipe and the steam pipe connected to each other, and having a steam nozzle head connected to the steam pipe; And,                     

Electromagnet hammer installed at least one outside the line ejector; by providing a dust removal device in the ejector of the vacuum degassing facility configured to remove the fixing dust in the ejector through hot water.

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

4 shows an ejector dust removing apparatus 1 of the vacuum degassing apparatus of the present invention, and the dust removing apparatus 1 of the ejector dust of the vacuum degassing apparatus of the present invention is largely connected to the pipe 10 and 14. ) And the hydrothermal tank 40 and the electromagnet hammer 50, these components 10, 14, 40, 50 will be described in more detail as follows.

First, although the dust removal apparatus 1 in the ejector 1 of the vacuum degassing apparatus of the present invention is shown in a perspective view of the main part in FIG. 4, in fact, as shown in FIG. 1, the dust collection unit connected to the dust collection degas vacuum chamber 110 is shown. Although it is installed in each ejection part 130 of the degassing line L, it may be possible to install only in the ejector 130 at two points before the first condenser 150 in the vacuum degassing line L.

On the other hand, as shown in Figure 4, the connecting pipe 10, 14 of the dust removal apparatus 1 in the ejector of the vacuum degassing facility of the present invention is exhausted to form a vacuum in the existing ejector 130 It is connected to the supply pipe 144 of the steam injection nozzle 140 for injecting steam to, between the connecting pipe 10, 14 as shown in detail below in the ejector 130 with the steam The hot water pump 12 for spraying to the fixed dust D side is provided.

Next, the hot water tank 40 is installed in the connection pipe 14, and the water supply pipe 20 and the steam pipe 30 are connected to the hot water tank 40, respectively, and the inside of the hot water tank 40. It is provided with a steam nozzle head 32 in which a plurality of scales 32a connected to the steam pipe 30 are arranged.

That is, the hot water tank 40 of the present invention heats water using steam used in the vacuum degassing line L without heating water using a separate equipment, which requires the addition of equipment. There is no need to reduce the cost, and the reason for using the hot water is that the hot water is easier to remove than the cold water when sprayed on the fixing dust (D).

In addition, as shown in Figure 4, the electromagnet hammer 50 is installed on the outside of the line ejector 130 at least one side, preferably both sides, such electromagnet hammer 50 is known as a commonly used equipment In addition, the electromagnet hammer 50 impacts the ejector 130 to facilitate separation and removal from the ejector of the fixing dust D into which hot water is injected.

On the other hand, in the vacuum degassing line (L) to which the connection pipe 10 of the present invention is connected, a drain pipe 70 for draining the removed dust D and the injected hot water is installed. Such a drain pipe 70 is provided. Is installed at a curved portion which is lifted up from the degassing line (L) and is installed at a position which does not flow to the vacuum chamber 110 side, and is disposed at a line at a lower position to other ejectors 130, so that the processing is performed at the condenser 150 side. do.                     

In addition, the connection pipe 10, 14, the water supply pipe 20, the steam pipe 30, and the steam supply pipe 144 may be electrically connected to the controller C to adjust the flow of hot water, water, and steam therein. Electronically actuated on / off valves 10a, 14a, 22, 34, and 144a are connected to each other, and at the same time, the control unit C has a temperature sensor 60a and a level sensor installed in the hot water tank 40. 60b and the electromagnet hammer 50 are electrically connected.

Therefore, the hot water temperature in the hot water tank 40 is sensed to open the valves 10a and 14a of the connecting pipes 10 and 14 while operating the hot water pump 12 at a desired temperature, for example, 100 ° C. or more. And open the valve 144a of the steam supply pipe 144 to inject hot water and steam, as shown in FIG. 4, and then operate the electromagnet hammer 50 to supply the level of water supplied to the hot water tank 40. When the amount is small, the valve 22 of the water supply pipe 20 is operated to control the level, and when the temperature of the hot water is low, the valve 34 of the steam pipe 30 is operated to adjust the injection amount of steam in the tank. Operation of such valves is performed through the control unit (C).

Referring to the operation of the present invention made of the above configuration as follows.

As shown in Figure 4 and 5, by using the existing equipment can effectively remove the dust (Dust) stuck in the degassing equipment ejector (ejector) (130) can effectively remove dust while reducing the additional equipment cost The dust removal apparatus 1 in the ejector of the vacuum degassing apparatus of the present invention which can improve the operation rate of the furnace vacuum degassing apparatus is as follows.

First, as shown in Figure 1, during the vacuum degassing process to supply steam at a pressure of about 7 ~ 8bar to the steam injection nozzle 140 mounted inside the ejector 130 of the venturi tube type (Venturi Tube) When spraying, a suction force is generated in a direction in which steam is injected, and the vacuum is formed while the vacuum chamber 110 is exhausted.

Then, the steam injected through the steam injection nozzle 140 reaches the condenser 150, by spraying the cooling water in the condenser 150 to liquefy the steam forcibly, a vacuum is formed by the size of the volume decreases at this time The vacuum is maintained as this series of steps proceeds continuously.

However, in the present invention, in order to remove the dust (D) in the ejector 130, the dust (D) attached to the ejector 130 by using the existing steam injection nozzle (4) without using a separate equipment as conventionally ) To be removed. Looking at these steps step by step based on FIG.

First, open the valve 22 of the water supply pipe 20 to the hot water tank 40, supply water, open the valve 34 of the steam pipe 30, supply steam into the tank 40, and the temperature of the water is increased. At least 100 ° C or higher (S1 in FIG. 5)

Next, the hot water temperature and the water level in the hot water tank 40 are sensed by the thermometer 60a and the level sensor 60b, and the signals are received and judged by the controller C to operate the valves 22 and 34 ( S2 of FIG. 5)

Then, once the hot water is formed of steam, the opening and closing valve 144a of the steam supply pipe 140 is opened when the apparatus 1 of the present invention is at rest, and is mounted inside the ejector 130 in the form of a venturi tube. Steam is injected through the steam injection nozzle 140 of about 7 ~ 8 bar (S3 of Figure 5).

Next, when steam starts to be injected, the valves 14a and 10a in the connecting pipes 14 and 10 of the pump 12 are opened through the control unit C, and the pump 12 is operated to operate the hot water tank ( The hot water in 40 is supplied to the conventional injection nozzle 140 is supplied steam (S4 of FIG. 5).

At this time, the hot water supplied to the ejector 130 together with the steam is sprayed on the fixing dust D attached to the ejector 130 to lower the adhesion force of the dust D. Keep the same.

That is, like the steam injected through the venturi tube-type injection nozzle 140, it is installed to increase suction by passing through the narrowest part of the venturi tube-type steam ejector without hitting it, and thus mixed with steam and sprayed The hot water must be concentrated on the narrowest part of the steam ejector 130 to be sprayed on the dust (D) which further reduces the diameter, thereby degrading the adhesion of the dust by adding moisture to the dust. (S5 of FIG. 5)

In the vacuum degassing process, the steam injection nozzle 140 is in the form of a Venturi tube, in which a high temperature steam of at least 170 ° C. or more is injected at a high speed without a time margin for liquefaction, and thus vacuum degassing treatment. It is very difficult to supply moisture to the dust (D) attached to the ejector 130 by spraying only steam as in the case.

Next, when the hot water spraying step (S4) of applying moisture to the dust (D) attached to the ejector 130 is completed, the adhesive force is remarkably dropped by operating the electromagnet hammer 50 mounted outside the narrowest part of the ejector 130. When hitting the dust (D) which is present, the dust (D) is dropped and removed (S6 in Fig. 5)

The dust D thus removed is externally discharged through the drain pipe 70 installed in the line L at the lower side of the ejector 3, the next pump 12 is stopped, and the connecting pipe 10, 14 is removed. To close the valves 10a and 14a to stop the hot water supply (S7 in FIG. 5).

Next, the valve 144a of the steam supply pipe 144 is closed to the ejector 130 of the vacuum degassing line L to complete the operation. (S8 of FIG. 5)

At this time, a series of steps of the hot water generating step (S1, S2), the step of applying hot water to the dirt (S5) and the electromagnet hammer 50 operation step (S6) is continuously in a predetermined time step through the control unit (C) If it is done, the dust removal will be performed effectively.

In addition, in the following table, the dust removal rate according to the temperature of hot water is shown.

steam water Dust removal rate pressure Temperature pressure Temperature 7.5bar 175 ℃ 7.5bar 15 ℃ 20% 7.5bar 175 ℃ 7.5bar 80 ℃ 65% 7.5bar 175 ℃ 7.5bar 95 ℃ 95%

Therefore, according to Table 1, when cold water is supplied at 15 ° C., cold water rapidly liquefies steam in the process of mixing and spraying cold water, and the amount of water increases while the injection force and the spraying force are injected through the steam injection nozzle 140. Because it weakens the spreadability of the dust is not evenly supplied to the dust (D) attached to the ejector 130 can be seen that only the dust of the closest portion to the steam injection nozzle 140 is removed, the removal rate is significantly low.                     

Then, when water at 80 ° C. was supplied, water was rapidly liquefied, as in the case of supplying cold water, and the amount of water increased, thereby reducing the spraying force injected through the steam injection nozzle 140 and the spreadability during the injection. As a result, the dust removal rate was improved, but the efficiency was low to apply it to the whole.

That is, the amount of liquefying steam is reduced only when hot water of 100 ° C. or more is sprayed together with steam through the steam injection nozzle 140, while the ejection force and the spreadability during the injection are maintained while the spraying force is injected through the steam injection nozzle 140. It can be seen that it removes more than 95% of dust in 130).

Accordingly, according to the present invention, in the ejector dust removal apparatus 1 of the vacuum degassing equipment, since the hot water is sprayed onto the dust while using the existing equipment, the adhesive force is first lowered and then removed as the hammer 50. It is to effectively remove the fixing dust (D) attached to the ejector 130 of the vacuum degassing line (L) without cost.

As described above, according to the present invention, in the ejector dust removal apparatus of the vacuum degassing equipment, when the dust is fixed in the ejector of the Venturi tube type of the vacuum degassing line, steam is formed to form an internal vacuum of the vacuum degassing equipment. By spraying hot water at an appropriate temperature through the existing steam injection nozzle to inject, there is an effect to effectively remove the dust (dust) stuck in the degassing equipment ejector (ejector) by using the existing equipment.                     

Therefore, it is possible to provide an excellent effect of further improving the operation rate of the equipment through the stable and continuous operation of the vacuum degassing equipment by effectively removing dust while reducing additional equipment costs.

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

Claims (3)

Installed in the vacuum degassing line (L) in the ejector 130 and the steam injection nozzle 140 for forming a vacuum of the equipment vacuum tank 110, A connection pipe 10 and 14 connected to the supply pipe 144 of the steam injection nozzle 140 and having a pump 12; and The hot water tank 40 is connected to the connecting pipe 14, the water supply pipe 20 and the steam pipe 30 is connected to each other, the steam nozzle head 32 is connected to the steam pipe 30 therein ; And, At least one electromagnet hammer 50 installed at the outside of the line ejector 130; and removing the dust in the ejector of the vacuum degassing facility, characterized in that configured to remove the fixing dust (D) in the ejector through hot water. Device According to claim 1, wherein the connection pipe 10, 14, the water supply pipe 20, the steam pipe 30 and the steam supply pipe 144, the control unit to adjust the flow of hot water, water and steam therein ( Electro-operated on / off valves 10a, 14a, 22, 34, 144a electrically connected to C), The control unit (C) is characterized in that the temperature sensor (60a) and the level sensor (60b) and the electromagnet hammer 50 is installed in the hot water tank 40 is electrically connected to control operation according to the temperature and level of the hot water. Dust removal device in ejector of vacuum degassing equipment According to claim 1, The connecting pipe 10, 14 is connected to the steam supply pipe 144 of the steam injection nozzle 140 disposed in the ejector 130 of the rising position of the vacuum degassing line (L), The line (L) in the ejector dust removal apparatus of the vacuum degassing equipment, characterized in that the drain pipe 70 for draining the injected hot water is installed below

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