KR101727809B1 - Soot removing apparatus for direct fired furnace and method thereof - Google Patents

Soot removing apparatus for direct fired furnace and method thereof Download PDF

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Publication number
KR101727809B1
KR101727809B1 KR1020150103435A KR20150103435A KR101727809B1 KR 101727809 B1 KR101727809 B1 KR 101727809B1 KR 1020150103435 A KR1020150103435 A KR 1020150103435A KR 20150103435 A KR20150103435 A KR 20150103435A KR 101727809 B1 KR101727809 B1 KR 101727809B1
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South Korea
Prior art keywords
soot
moving
detecting
degree
pipe
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KR1020150103435A
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Korean (ko)
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KR20170011203A (en
Inventor
오현영
김영호
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현대제철 주식회사
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Priority to KR1020150103435A priority Critical patent/KR101727809B1/en
Publication of KR20170011203A publication Critical patent/KR20170011203A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/04—Arrangements of indicators or alarms

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The present invention relates to an apparatus and a method for removing soot from a direct-heating furnace, in which, in order to block soot moving in the exhaust gas from above and below a steel sheet which is heated by a direct- A soot detecting part for detecting the degree of generation of soot moving through the pipe, and a control part for adjusting and operating the number of steps of the blocking film according to the degree of soot generation in the pipe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soot removal apparatus and method for a direct-

The present invention relates to an apparatus and a method for removing soot from a direct heating furnace, and more particularly, to a method and apparatus for removing soot from a direct-heating furnace (DFF) used for heating a steel sheet to a predetermined temperature in a continuous galvanizing line (CGL) Direct Fired Furnace, which is capable of removing soot generated in a direct-fired heating furnace.

Generally, in order to produce a hot-dip galvanized steel sheet, a degreasing process is first performed to remove rolling oil, anti-corrosive oil and foreign substances adhering to the surface of the steel sheet of the cold-rolled steel sheet subjected to the continuous rolling process.

The steel sheet (cold-rolled steel sheet) subjected to the degreasing process moves through a direction changing roll and is heated to a predetermined temperature through a direct heating furnace (DFF) and an indirect heating furnace (RTH), passes through a plating bath (POT) Thereby forming a film.

The background art of the present invention is disclosed in Korean Registered Utility Model No. 20-0345270 (Registered on Mar. 03, 2004, a condensed water separator of a dryer steam line in a hot dip galvanized steel sheet production line).

According to one aspect of the present invention, there is provided a method for removing soot generated by a direct-fired heating furnace (DFF) used for raising a steel sheet to a predetermined temperature in a hot dip galvanized steel sheet production line (CGL) And to provide a soot removing apparatus and method for a direct-heating furnace.

The soot removing apparatus according to one aspect of the present invention is a soot removing apparatus in which a moving soot is attached in order to block soot moving in the exhaust gas from above and below a steel sheet which is heated by a direct- At least one barrier film; A soot detecting unit for detecting a degree of occurrence of soot moving through the pipe; And a controller for adjusting and operating the number of stages of the blocking membrane according to the degree of soot generation in the piping.

The present invention is further characterized by a sensor unit moving through the pipe and varying signal strength depending on whether the soot is large or small, and outputting the signal intensity to the soot output unit.

In the present invention, the control unit operates the one-stage blocking film when the soot is detected to be less than the reference, and operates the N-stage blocking film when the soot is detected more than the reference.

The present invention further includes a differential pressure detector for detecting a differential pressure DELTA P caused by a temperature difference between the direct heating portion and the indirect heating portion, and the control portion maintains the differential pressure detected through the differential pressure detector at a preset reference The operating angle and the number of operation stages of the blocking film can be adjusted.

In the present invention, the shielding film is a kind of curtain for collecting soot, wherein pores having a diameter smaller than a specific size are formed, and soot is adsorbed through the opening.

According to the present invention, the shielding membrane is installed to adjust the operating angle under the control of the control unit, and when it is operated, a certain distance from the surface of the steel plate is spaced apart, .

According to another aspect of the present invention, there is provided a soot removing method for removing soot generated by a direct-heating furnace used for raising a steel sheet to a predetermined temperature in a hot-dip galvanized steel sheet production line, Detecting the degree of occurrence of soot moving through the pipe by the soot detecting unit; Adjusting the number of the shielding membranes according to the degree of soot generation in the piping; According to another aspect of the present invention, there is provided a method of controlling an internal combustion engine, comprising the steps of:

In the present invention, the step of detecting the degree of generation of soot may include a step of detecting the degree of generation of soot by receiving the output signal of the sensor unit, the signal intensity of which fluctuates depending on whether the soot moves through the pipe, Is detected.

According to one aspect of the present invention, there is provided a method for removing soot generated by a direct-fired heating furnace (DFF) used for raising a steel sheet to a predetermined temperature in a hot dip galvanized steel sheet production line (CGL) .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an entire process of a hot dip galvanized steel sheet production line to which a soot removing apparatus according to an embodiment of the present invention is applied; FIG.
Fig. 2 is an exemplary view showing schematic operation characteristics of the direct-heating furnace (DFF) and the indirect heating furnace (RTH) in Fig.
FIG. 3 is an exemplary view showing a schematic configuration of a soot removing apparatus of a direct-finizing heating furnace according to an embodiment of the present invention; FIG.
FIG. 4 is an exemplary view for explaining the shape and characteristics of the blocking film 110 in FIG.
FIG. 5 is an exemplary view showing a schematic configuration of a soot removal method of a direct-finizing heating furnace according to an embodiment of the present invention; FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a soot removing apparatus and method according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a schematic view showing an entire process of a hot dip galvanized steel sheet production line to which a soot removing apparatus according to an embodiment of the present invention is applied.

As shown in FIG. 1, in the soot removing apparatus according to the present embodiment, a steel strip STRIP that has undergone a degreasing process through a degreasing facility moves through a direction changing roll and passes through a plating bath (POT) And performs a function of detecting and removing soot (SOOT) generated in the step of heating through the direct heating furnace (DFF) which is the previous stage.

Fig. 2 is an exemplary view showing the schematic operation characteristics of the direct-heating furnace (DFF) and the indirect heating furnace (RTH) in Fig.

As shown in Fig. 2 (a), the direct heating furnace (DFF) directly heats the steel strip STRIP using a flame of a burner using an engine (LNG) as a raw material. As shown in FIG. 2 (b), the indirect heating furnace RTH is a system in which the air (exhaust gas) heated by the burner flows indirectly through the inside of the radiation tube and indirectly heats the steel strip STRIP using ambient air heated by the burner .

Therefore, the heating method by the indirect heating furnace is not likely to cause soot. However, in the heating method by the direct heating furnace, the particulate matter (that is, soot) in which the organic carbon coagulates when the incomplete combustion coagulates and the diameter of the particles becomes 1 [ .

The soot may directly affect the quality of the steel sheet itself due to carbon deposition and may adhere to the surface of the roll that transports the steel strip when it is continuously generated, .

The soot is continuously moved to the next step (for example, indirect heating, hot dip galvanizing, etc.) through the pipe (pipe for maintaining and moving the temperature of the steel sheet) together with the exhaust gas and is likely to adhere to the steel sheet surface or the roll surface high.

Therefore, in the past, it was confirmed that the generation of soot was simply observed through the naked eye, and the differential pressure (the pressure caused by the difference between the heating temperature by the direct heating furnace and the heating temperature by the indirect heating furnace) , So it was not possible to detect the soot, or only to detect soot, or to remove the soot even if it was sooty.

Accordingly, the present embodiment provides a soot removing apparatus and method for a direct-heating furnace which can automatically detect and remove soot generated by a direct-finizing heating furnace (DFF).

3 is an exemplary view showing a schematic configuration of a soot removing apparatus of a direct-finizing heating furnace according to an embodiment of the present invention.

3, the soot removing apparatus according to the present embodiment includes a blocking film 110, a sensor unit 120, a blocking film driving unit 130, a soot detecting unit 140, a differential pressure detecting unit 150, And a controller 160.

The shielding film 110 is a film for blocking the soot from moving through the inside of the pipe by attaching soot moving in the exhaust gas in the upper and lower parts of the steel sheet moving inside the pipe.

FIG. 4 is an exemplary view illustrating the shape and characteristics of the blocking layer 110 in FIG.

The blocking membrane 110 is a kind of curtain for collecting soot. As shown in Fig. 4, a hole having a diameter of a certain size (for example, 1 mu m) or less is formed, so that soot is adsorbed through the hole There are characteristics.

For example, the barrier layer 110 may be formed of carbon fibers of honeycomb type, but is not limited thereto.

Also, since the barrier layer 110 is thin like a curtain, one or N stages (i.e., several layers or several sheets) may be installed to increase the soot collecting function (or the soot adsorption function). The control unit 160 may operate the first or N-stage blocking film 110 according to the degree of generation of soot.

A predetermined distance (for example, 0.5 mm) from the surface of the steel strip is spaced apart from the surface of the steel strip so as not to affect the movement of the steel strip, (The pressure generated by the difference between the heating temperature by the direct heating furnace and the heating temperature by the indirect heating furnace) can be increased.

Further, when the blocking film 110 is not operated (that is, turned OFF), it is horizontal to the inner surface of the pipe (that is, 90 degrees in operation), and does not affect the flow of the exhaust gas.

The operating angle (e.g., 0 to 90 degrees) of the blocking film 110 can be controlled by a motor (not shown).

Referring again to FIG. 3, the sensor unit 120 senses soot flowing through the pipe. For example, assuming that the sensor unit 120 is a photo laser sensor, the laser signal intensity varies depending on whether there is too much or too little soot (for example, the output of the laser signal intensity increases as the soot becomes darker).

The barrier-membrane driving unit 130 operates the first-stage or N-stage blocking membrane 110 under the control of the controller 160.

For example, when less soot is detected according to the standard, the first-stage blocking film 110 is operated. When a lot of soot is detected, the N-stage blocking film 110 is operated.

The soot detecting unit 140 detects soot based on a signal (V in ) output from the sensor unit 120.

For example, the soot detecting unit 140 may detect the degree of soot generated by comparing the output signal V in of the sensor unit 120 with the reference signal V set . At this time, by setting the range of the output signal (V in ) to a plurality of values (for example, 0.1 to 0.5 mV, 0.5 mV or more), the degree of soot generation can be detected in a plurality of steps (for example, , N-stage - plenty of soot, etc.).

3, the sensor unit 120 is installed at the rear end of the blocking film 110. However, in order to enhance the soot removal effect, the sensor unit 120 may be installed at the front end of the blocking film 110 It is possible.

The differential pressure detector 150 detects a differential pressure (DFF-RTH =? P) caused by a temperature difference between the direct heating part and the indirect heating part.

Typically, the pressure difference? P is maintained at 2 (mmH 2 0) or less.

For example, the pressure (P 1 ) in the direct heating part is controlled to 15 to 20 (mmH 2 0) and the pressure (P 2 ) in the indirect heating part is controlled to 10 to 15 (mmH 2 O) 2 0).

The control unit 160 operates the first or Nth blocking layer 110 through the blocking layer driving unit 130 according to the degree of soot detected through the soot detecting unit 140. [ The controller 160 controls the differential pressure P to be at least 2 (mmH 2 0) in consideration of the error when the blocking membrane 110 is operated to remove soot. That is, the blocking layer 110 may be operated to adjust the differential pressure AP.

FIG. 5 is an exemplary view showing a schematic configuration of a soot removing method of a direct-finizing heating furnace according to an embodiment of the present invention.

As shown in FIG. 5, the controller 160 detects soot flowing through the piping through the soot detecting unit 140 (S101).

The soot detecting unit 140 detects soot based on a signal (V in ) output from the sensor unit 120 installed in the piping.

The control unit 160 compares the preset reference signal V set with the output signal V in of the sensor unit 120 received through the soot detecting unit 140 and outputs the reference signal V set It is determined whether the output signal V in is the same in consideration of the error (S102).

If the reference signal V set and the output signal V in are not equal to each other (NO in S102), the controller 160 determines whether the output signal V in is within a predetermined first range (0.1 to 0.5 mV) (S103).

If it is determined in step S103 that the output signal V in is within the first range (0.1 to 0.5 mV) (YES in step S103), the controller 160 determines that there is less soot than the reference, The blocking film 110 is operated (S104) (that is, the first-stage blocking film is turned ON).

If the output signal V in is not in the first range (0.1 to 0.5 mV) (NO in S103) (that is, 0.5 mV or more), it is determined that the output signal V in is softer than N (Step S105) (i.e., the N-step blocking film is turned ON).

When the reference signal V set and the output signal V in are equal to each other in consideration of the error in operation S102 or when the blocking film 110 is operated by the soot generation S104, and S105), the pressure difference? P may have changed.

Therefore, the control unit 160 determines whether the pressure difference? P is equal to a predetermined reference (for example, 2.0 (mmH 2 0)) in consideration of the error (S106).

If the differential pressure AP is not equal to a predetermined reference (for example, 2.0 (mmH 2 0)) (NO in S106), the degree of occurrence of soot is detected and the blocking film 110 is detected (S102 to S105) are repeatedly performed.

However, according to the determination (S106), the differential pressure (ΔP) is predetermined by: stop if the same (such as 2.0 (mmH 2 0)) ( S106 example of), the control unit 160 is blocking film 110 works (S107) (i.e., the blocking film is turned off).

As described above, since the present embodiment has mainly described the process of removing soot, the process of maintaining the differential pressure? P equal to a preset reference (for example, 2.0 (mmH 2 0)) will be described in more detail The differential pressure AP can be adjusted by adjusting the operating angle (for example, between 0 and 90 degrees) of the blocking layer 110 and the operating number of the blocking layer 110 (for example, the first to Nth steps).

As described above, the present embodiment has an effect of removing soot generated by the direct-fired heating furnace (DFF) used for raising the temperature of the steel sheet to a predetermined temperature in the hot dip galvanized steel sheet production line (CGL) .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

110:
120:
130:
140: Soot detecting unit
150: Differential pressure detector
160:

Claims (8)

At least one shielding film for adhering the moving soot in order to shield soot moving in the exhaust gas from above and below the steel sheet which is heated by the direct heating furnace and moves inside the pipe,
A soot detecting unit for detecting a degree of occurrence of soot moving through the pipe; And
And a control unit for adjusting and operating the number of steps of the blocking film according to the degree of soot generation in the pipe,
Wherein,
When the soot is detected to be less than the reference, a first-stage blocking film is operated,
And when the soot is detected more than the reference, the N-stage blocking film is operated.
The method according to claim 1,
As a result of moving through the piping to increase or decrease soot,
Further comprising: a sensor unit configured to vary the signal intensity and output the signal intensity to the soot detecting unit.
delete The method according to claim 1,
And a differential pressure detector for detecting a differential pressure DELTA P generated by a temperature difference between the direct heating portion and the indirect heating portion,
Wherein the control unit is capable of adjusting an operating angle and an operation number of the blocking film to maintain the differential pressure detected through the differential pressure detecting unit at a preset reference.
The method according to claim 1,
A soot removal device of a direct-heating furnace characterized in that a kind of curtain for collecting soot has a pore having a diameter smaller than a specific size and adsorbs soot through the opening.
The method according to claim 1,
And an operating angle is adjusted according to the control of the controller,
Wherein the predetermined distance from the surface of the steel plate when operated is horizontal, and is horizontal to the inner surface of the pipe when the steel plate is not operated.
A soot removal method for removing soot generated by a direct-heating furnace used for raising a steel sheet to a predetermined temperature in a hot-dip galvanized steel sheet production line,
Detecting the degree of occurrence of soot moving through the pipe by the soot detecting unit;
Adjusting the number of the shielding membranes according to the degree of soot generation in the piping; And
And removing at least one blocking film by operating the control unit to remove and remove soot moving through the inside of the pipe.
8. The method of claim 7, wherein the step of detecting the degree of soot formation comprises:
As a result of moving through the piping to increase or decrease soot,
Wherein the soot detecting section receives the output signal of the sensor section whose signal intensity fluctuates and detects the degree of generation of soot.
KR1020150103435A 2015-07-22 2015-07-22 Soot removing apparatus for direct fired furnace and method thereof KR101727809B1 (en)

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KR1020150103435A KR101727809B1 (en) 2015-07-22 2015-07-22 Soot removing apparatus for direct fired furnace and method thereof

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KR101727809B1 true KR101727809B1 (en) 2017-04-17

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200345270Y1 (en) 2003-12-26 2004-03-18 현대하이스코 주식회사 The steam separator of drier steam line in continuous galvanizing line

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200345270Y1 (en) 2003-12-26 2004-03-18 현대하이스코 주식회사 The steam separator of drier steam line in continuous galvanizing line

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