KR102243545B1 - System for analyzing ignition state in burner zone method thereof - Google Patents

Abstract

The present invention discloses a burner zone ignition state analysis system and method for determining at least one of whether or not ignition is successful and the cause of ignition failure by analyzing an image photographed of a flame of a flame generating device and a fuel injection of a fuel injection device.

Description

Burner zone ignition state analysis system and its method TECHNICAL FIELD [SYSTEM FOR ANALYZING IGNITION STATE IN BURNER ZONE METHOD THEREOF}

The present invention relates to a burner zone ignition state analysis system and a method thereof, and more particularly, to a technique for analyzing the ignition state in a burner zone using an image photographed of the flame of the flame generating device and the fuel injection of the fuel injection device. About.

A burner zone for spark ignition is formed inside the furnace that provides a space for putting raw materials and heating, and the burner zone is equipped with a spark generator that generates sparks and a fuel injection device that injects fuel into the flame. .

1 is an example of a conventional ignition process. In the related art, a remote manager manipulates a remote control device to input an ignition command to instruct a spark generator and a fuel injection device to ignite an ignition operation.

The spark generator and the fuel injection device advance to the burner zone in response to an ignition command and perform an ignition operation. A local manager located around the furnace visually observes the flame or fuel injection to check whether the ignition was successful, and provides the result of ignition determination to the remote manager using a radio. The remote manager inputs an ignition command for retrying ignition in case of ignition failure.

Conventionally, in order to reduce the fuel cost of a power plant equipped with a heating furnace, a highly viscous decompression refined oil was used as the ignition fuel. Could cause the ignition to fail.

Conventionally, if ignition is attempted continuously when ignition fails, the pressure inside the heating furnace increases and the gas becomes cold, so there may be a risk of explosion, so the ignition was attempted again after a certain period of time to discharge the gas inside the heating furnace.

However, in the related art, since the inside of the heating furnace is in a dark state, it is difficult to determine whether fuel injection has been performed normally through visual identification of the local manager, and it is difficult to identify the cause of the ignition failure because it is difficult for the local manager to visually identify. In addition, in the related art, unnecessary fuel injection occurs while the determination result according to the ignition success is notified, so that the amount of fuel consumed during ignition may increase.

Korean Patent Publication No. 10-2016-0071378

In order to solve the above problem, the present invention determines at least one of whether or not the ignition is successful and the cause of the ignition failure by analyzing the image of the flame of the flame generating device and the fuel injection of the fuel injection device.

A burner zone ignition state analysis system including a flame generator that is formed in a burner zone of a heating furnace to generate a flame and a fuel injection device that injects fuel into the flame according to an embodiment of the present invention for the above problem to be solved, A photographing apparatus comprising a visual camera for photographing fireworks and an infrared camera for photographing fuel injection, and a remote control apparatus for controlling the operation of the fuel injection apparatus and the flame generating apparatus using image information of the photographing apparatus, and the remote The control device controls the operation of the fuel injection device and the flame generating device using an analysis unit that analyzes the ignition state of the burner zone using image information of the photographing device and the analysis information that analyzes the ignition state of the burner zone by the analysis unit. Including a control unit, the analysis unit is characterized in that for generating analysis information that analyzes at least one of whether or not the ignition is successful and the cause of the ignition failure.

The analysis unit may include: a first analysis unit configured to determine an abnormality of the flame generating device by analyzing whether or not a flame is generated or a spreading pattern based on the first image information photographed by the visual camera; A second analysis unit for determining an abnormality of the fuel injection device by analyzing the fuel injection type using the second image information photographed by the infrared camera, and whether the ignition is successful as a result of analysis/discrimination of the first analysis unit and the second analysis unit, and It may be characterized in that it comprises a third analysis unit for generating analysis information by analyzing at least one of the causes of the ignition failure.

The visual camera includes a zoom lens that provides a zoom-in operation during an ignition process and a zoom-out operation during a driving process, and a high-speed photographing unit that provides a high-speed photographing of 300 frames or more per second using the zoom lens. can do.

The infrared camera may include an infrared filter for passing an infrared signal having a mid-length wavelength of 3 μm to 14 μm; It may be characterized in that it comprises an infrared detector for detecting an infrared signal passing through the infrared filter and a digital filter for removing unnecessary frequency components of the infrared signal.

A flame generating device that is formed in the burner zone of a heating furnace and generates a flame according to an embodiment of the present invention, a fuel injection device that injects fuel into the flame, a photographing device composed of a visual camera and an infrared camera, and a fuel injection device and a flame generating device A burner zone ignition state analysis method using a remote control device for controlling the operation of the burner zone, comprising: the visual camera photographing the flame, and the infrared camera photographing the fuel injection; Receiving, by the remote control device, image information including first image information captured by a visual camera and second image information captured by an infrared camera; Analyzing the ignition state of the burner zone using the image information and controlling the operation of the flame generating device and the fuel injection device through the analysis information obtained by analyzing the ignition state of the burner zone. It characterized in that the analysis information is generated by analyzing at least one of the presence or absence of success and the cause of the ignition failure.

In the present invention, by analyzing the image captured of the flame of the flame generating device and the fuel injection of the fuel injection device to determine at least one of the ignition success or the cause of the ignition failure, there is no need for on-site input of a local manager to determine whether the ignition is successful or not. Accordingly, it is possible to reduce manpower cost, and it is possible to immediately determine whether ignition is successful or not, thereby reducing the amount of fuel consumed during ignition.

1 is an example showing a conventional ignition process.
2 is a block diagram showing a burner zone ignition state analysis system according to an embodiment of the present invention.
3 is a perspective view showing in detail the flame generating device and the fuel injection device.
4 is a cross-sectional view illustrating the visual camera of FIG. 2 in detail.
5 shows the structure of the zoom lens in detail.
6 shows the structure of the relay lens in detail.
7 is a block diagram showing in detail the infrared camera of FIG. 2.
FIG. 8 shows an operable wavelength band and absorption rate of the infrared camera of FIG. 2.
9 is a block diagram showing in detail the remote control device of FIG. 2.
10 is a block diagram showing in detail the analysis unit of FIG. 9.
11 is an example showing the form of oil injection.
12 is a flowchart illustrating a burner zone ignition state analysis method according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and contents described in the accompanying drawings, but the present invention is not limited or limited by the embodiments.

2 is a block diagram showing a burner zone ignition state analysis system according to an embodiment of the present invention, and the burner zone ignition state analysis system 10 includes a flame generating device 110, a fuel injection device 120, and a photographing device ( 200) and a remote control device 300.

The flame generating device 110 and the fuel injection device 120 are installed in the burner zone inside the heating furnace, the photographing device 200 is installed outside the heating furnace, and the remote control device 300 is installed in a remote area. The flame generating device 110, the fuel injection device, and the photographing device 200 are formed in a local area where the heating furnace is located. The photographing apparatus 200 may enter the inside of the heating furnace to photograph the ignition in the burner zone, and may provide a moving function of forward and backward. The heating furnace may be a boiler for a power plant, a furnace for a steel mill, an incinerator, or a sintering furnace, and may be various spaces for inserting and heating raw materials, but is not limited thereto.

3 is a perspective view showing in detail the flame generating device and the fuel injection device, one end of the flame generating device 110 and the fuel dispersing device 120 may be formed inside the furnace, the other end is a burner inside the furnace It may be formed in the zone, and the middle may be formed in a wind box 130 located between the inside and the outside of the heating furnace. The wind box 130 may receive combustion air sent from a blower (not shown) and control it to be sent to the inside of the heating furnace, and control the air to flow uniformly or evenly.

The flame generating device 110 may be an igniter as a device for generating a flame, and the fuel injection device 120 may be an oil gun as a device for injecting fuel. The fuel injection device may inject liquid or gas type fuel, may supply air together when supplying fuel, and various types of fuel may be used, but is not limited thereto.

The flame generating device 110 and the fuel injection device 120 may provide a forward and backward movement function, and may automatically operate in response to an ignition command from the remote control device 300. The fuel injection device 120 may be formed on the flame generating device 110 to inject fuel toward the flame.

In the ignition method, fuel is first injected through the fuel injection device 120, and when the fuel injection starts, a spark is generated through the flame generating device 110 to perform ignition. Another ignition method may be ignited by operating the fuel injection device 120 and the flame generating device 110 at the same time.

The photographing device 200 includes a visual camera 210 and an infrared camera 220. The visual camera 210 photographs the flame generated by the flame generating device 110, and the infrared camera 220 photographs the oil injected by the fuel injection device 120.

4 is a cross-sectional view illustrating the visual camera of FIG. 2 in detail, and the visual camera 210 includes a zoom lens 211a, a housing unit 212 and a high-speed photographing unit 213. The zoom lens 211a provides a zoom-in operation in the ignition process and a zoom-out operation in the boiler operation process. The visual camera 210 may photograph the flame in the ignition process through the zoom-in operation, and the inside of the heating furnace through the zoom-out operation.

The reason why the inside of the furnace is photographed during the operation of the boiler is to monitor the flame condition inside the furnace, to monitor whether the inner wall of the furnace is cracked, and to monitor whether a clinker is formed in the inner wall of the furnace.

5 shows the structure of the zoom lens in detail, and FIG. 6 shows the structure of the relay lens in detail, and the housing part 212 may be formed between the zoom lens 211a and the high-speed photographing part 213 , The zoom lens 211a or the high-speed photographing unit 213 may be housed. In the housing 212, a relay lens 211b may be formed in an inner tube between the zoom lens 211a and the high-speed photographing unit 213, and a cooling means may be formed between the outer tube and the inner tube.

The zoom lens 211a provides a function of enlarging and reducing a subject by using refraction of light, so that a spark in the ignition process can be photographed and the inside of the heating furnace in the driving process can be photographed. For example, the zoom lens 211a performs a zoom-in operation as shown in FIG. 5 to capture fireworks.

The relay lens 211b provides a function of transferring the image of the subject initially formed from one end to the other end, and the high-speed photographing unit 213 vulnerable to high temperature is separated from the zoom lens 211a by a predetermined distance through the relay lens 211b. Can be installed.

The cooling means is designed as an air-cooled or water-cooled type so that the visual camera 210 performs a photographing operation even at a high temperature, and protects the relay array lens or high-speed photographing unit 213 located in the inner tube.

The high-speed photographing unit 213 provides high-speed photographing of 300 frames or more per second using a zoom lens. According to the present invention, through a zoom lens for precise photographing and a high-speed photographing unit 213 that provides high-speed photographing of 300 frames or more per second, it is possible to photograph a flame that occurs instantaneously, and a spreading form of the flame may be photographed.

FIG. 7 is a block diagram showing in detail the infrared camera of FIG. 2, wherein the infrared camera 220 photographs injection types of gas and oil expressed only in a specific band such as complete combustion and incomplete combustion, and states before and after ignition. The infrared camera 220 includes an infrared filter unit 221, an infrared detection unit 222, a digital filter unit 223, and an image output unit 224.

FIG. 8 shows an operable wavelength band and absorption rate of the infrared camera of FIG. 2, and the infrared filter unit 221 passes an infrared signal having a mid-length wavelength of 3 μm to 14 μm.

Conventionally, a medium wavelength camera of 3 µm to 5 µm or a long wavelength camera of 7 µm to 14 µm is used to measure the temperature inside the furnace or to visually indicate the heat energy, but the gases detectable in each wavelength band are limited. , There is a problem in that it is difficult to photograph the type of oil injection or the state before and after ignition.

The present invention uses an infrared filter unit 221 that passes an infrared signal having a mid-long wavelength of 3 μm to 14 μm in order to photograph the injection type of gas and oil expressed only in a specific band such as complete combustion and incomplete combustion, and the state before and after ignition. do. In more detail, the present invention uses the infrared filter unit 221 not only to measure the temperature inside the heating furnace, but also to determine whether ignition is successful or not.

The infrared detection unit 222 detects the infrared signal that has passed through the infrared filter unit 221, the digital filter unit 223 removes unnecessary frequency components of the infrared signal, and the image output unit 224 removes the frequency component. Outputs an infrared signal.

Since the infrared detection rate of the portion where the oil injection has occurred is different from that of other portions, the infrared detection unit 222 may detect an infrared signal indicating a portion where the oil injection occurs and a portion where the oil injection does not occur.

9 is a block diagram showing in detail the remote control device of FIG. 2, wherein the remote control device 300 includes at least one of a communication unit 310, an analysis unit 320, a display unit 330, and a control unit 340. do.

The communication unit 310 receives image information from the photographing device 200 through a wired/wireless network and provides it to the analysis unit 320. The analysis unit 320 analyzes the ignition state of the burner zone using image information, and the control unit 340 uses the analysis information analyzed by the analysis unit 320 to analyze the ignition state of the fuel injection device and the flame generating device. Control the operation. The display unit 330 may display image information or analysis information, and the remote manager may monitor the ignition state through the display unit 330. The image information includes first image information captured by the visual camera 210 and second image information captured by the infrared camera 220.

10 is a block diagram showing in detail the analysis unit of FIG. 9, and the analysis unit 320 includes a first analysis unit 321, a second analysis unit 322, and a third analysis unit 323. The flame generating device 110 may not generate a flame if a set high voltage is not applied, or the flame may be abnormally generated. Therefore, the first analysis unit 321 uses the first image information to determine whether or not the flame is generated or the shape of the flame. It is possible to determine the abnormality of the flame generating device 110 by analyzing.

Since the inside of the furnace is in a dark blackout state before ignition, and it is difficult to install a facility that can illuminate a light to distinguish the boundary between the part where oil is sprayed and the background in a high-temperature environment inside, the present invention provides the second image information. It is possible to perform correction to clearly distinguish the boundary between the oil sprayed part and the background.

A moving object such as dust mixed in the air may be formed on a fixed object such as the inner wall of a heating furnace, and a moving object such as dust may appear in the form of noise in the image, in the form of fuel injection or gas generated when igniting. Since it may become an obstructive factor in confirming the distribution, the second analysis unit 322 may perform correction to remove noise such as a moving object such as dust from the second image information.

The second analysis unit 322 may perform image correction to highlight a contrast effect between a portion where oil is sprayed and a background using a histogram smoothing method. Correction to increase the contrast can increase the contrast difference by multiplying the intensity of each pixel by the same value. The histogram smoothing method calculates the number of frequencies of brightness values using a histogram, calculates and accumulates the number of frequencies of the calculated brightness values to obtain and normalize the accumulated histogram values, and normalizes using a gray scale mapping function The accumulated histogram is mapped to a gray level value.

The second analysis unit 322 may secondaryly perform image correction to remove a moving object such as dust. A method of removing a moving object is a method of identifying a moving object by comparing images on a frame-by-frame basis, and removing the identified object.

The fuel injector 120 includes a plurality of nozzles and injects fuel in a direction set through the nozzles, but if a highly viscous pressure-reduced refined oil is used, it may be difficult to supply fuel normally, and a nozzle clogging phenomenon may occur. 2 The analysis unit 322 may determine an abnormality of the fuel injection device 120 by analyzing the injection type of fuel using the second image information. For example, the second analysis unit 322 may determine whether a nozzle of the fuel injection device 120 is clogged or an abnormality in the fuel injection amount by analyzing the fuel injection type.

11 is an example showing the form of oil injection. In more detail, FIG. 11(a) shows a normal oil injection type, and FIGS. 11(b) to 11(d) are examples showing an abnormal oil injection type due to clogging of a nozzle.

The second image information is a black-and-white image, and the inside of the furnace is in a blackout state before ignition, so even if the remote manager checks the second image information through the display unit 330, the fuel injection type or gas distribution generated when ignition is checked. There are problems that can be difficult. Accordingly, the second analysis unit 322 may perform a color conversion process by dividing the second image information by a gray scale of 0 to 255 and replacing a specific value with a set RGB color. The color substituted with a specific value may be oil or gas.

Conventionally, a color conversion process is performed to distinguish temperatures, but in the present invention, a color conversion process may be performed to indicate a fuel injection type or a gas distribution generated when ignition is performed.

The second analysis unit 322 may determine an abnormality of the fuel injection device 120 by extracting the fuel injection region from the second image information and comparing the injection region with the reference region. The reference area is an area of a set size to find out whether fuel is injected normally or abnormally.

The third analysis unit 323 generates analysis information by analyzing at least one of whether the ignition success or not and the cause of the ignition failure based on the analysis/determination result of the first analysis unit 322 and the second analysis unit 323.

In the present invention, by using the visual camera 210 for photographing a flame and the infrared camera 220 for detecting an infrared signal of a mid-length wavelength, it is possible to find out whether or not the ignition is successful. In addition, the present invention can analyze the cause of the ignition failure even in a dark state by using the analysis unit 320 that analyzes the occurrence or spread of a flame, and analyzes the fuel injection type or gas distribution generated when ignition. The cause of failure can be quickly identified and maintenance can be performed smoothly, and the operation efficiency of the power plant can be improved through smooth maintenance.

The display unit 330 may display the first image information and the second image information together, and may indicate whether or not the ignition has succeeded. If the ignition fails, the cause of the ignition failure is included in the first image information or the second image information together. Can be displayed.

The control unit 340 finds out whether or not the ignition is successful through the analysis information. When the ignition is successful, the control unit 340 generates control information for stopping the operation of the flame generating device 110 and the fuel injection device 120. If the ignition fails, the control unit 340 may generate control information for re-ignition or may generate repair request information for requesting repair of the flame generating device 110 or the fuel injection device 120.

The controller 340 may generate control information or repair request information through input information input by a remote administrator. The local administrator may check the repair request information to repair the flame generating device 110 or the fuel injection device 120.

12 is a flow chart showing a burner zone ignition state analysis method according to an embodiment of the present invention, wherein the burner zone ignition state analysis method includes a flame generating device 110 that is formed in a burner zone of a heating furnace to generate a flame, and The fuel injection device 120 for injecting fuel into the photographing device 200 consisting of the visual camera 210 and the infrared camera 220, and the flame generating device 110 and the fuel injection device 120 and a remote control that controls the operation. The control device 300 is used.

The visual camera 210 photographs the flame, and the infrared camera 220 photographs the fuel injection. The remote control device 300 receives image information including first image information captured by the visual camera 210 and second image information captured by the infrared camera 220.

The remote control device 300 generates analysis information by analyzing the ignition state of the burner zone using image information, and controls the flame generating device 110 and the fuel injection device 120 and the operation through the analysis information. The remote control device 300 generates analysis information obtained by analyzing at least one of whether ignition is successful or not and causes of ignition failure. For example, the remote control device 300 may analyze whether or not a flame is generated or a spreading pattern, and analyze a fuel injection type or a gas distribution generated when ignition to analyze the cause of ignition failure.

10: burner zone ignition state analysis system 110: flame generating device
120: fuel injector 200: photographing device
210: visual camera 220: infrared camera
300: remote control device 310: communication unit
320: analysis unit 330: display unit
340: control unit

Claims (5)

In the burner zone ignition state analysis system including a flame generator that is formed in a burner zone of a heating furnace to generate a flame and a fuel injection device that injects fuel into the flame,
A photographing device comprising a visual camera for photographing the fireworks and an infrared camera for photographing fuel injection, and
Including a remote control device for controlling the operation of the fuel injection device and the flame generating device by using the image information of the photographing device,
The remote control device,
An analysis unit that analyzes the ignition state of the burner zone with image information of the photographing device, and
And a control unit for controlling the operation of the fuel injection device and the flame generating device using analysis information obtained by analyzing the ignition state of the burner zone by the analysis unit,
The analysis unit generates analysis information obtained by analyzing at least one of whether the ignition is successful or not and the cause of the ignition failure,
The infrared camera,
An infrared filter unit for passing an infrared signal having a mid-length wavelength of 3 μm to 14 μm;
An infrared detection unit for detecting an infrared signal passing through the infrared filter unit and
And a digital filter for removing unnecessary frequency components of the infrared signal. The method of claim 1,
The analysis unit,
A first analysis unit for determining an abnormality of the flame generating device by analyzing whether or not a flame is generated or a form of spreading based on the first image information photographed by the visual camera;
A second analysis unit for determining an abnormality of the fuel injection device by analyzing the injection type of fuel using the second image information photographed by the infrared camera, and
And a third analysis unit configured to generate analysis information by analyzing at least one of whether or not ignition has succeeded and a cause of ignition failure based on an analysis/determination result of the first analysis unit and the second analysis unit. The method of claim 1,
The visual camera,
A zoom lens that provides a zoom-in operation in the ignition process and a zoom-out operation in the driving process, and
A burner zone ignition state analysis system comprising a high-speed photographing unit that provides high-speed photographing of 300 frames or more per second using the zoom lens. delete delete

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