CN1233149C - Image processing method for processing image of plug in type stove camera - Google Patents

Abstract

The invention provides an image processing method for the image of a plug-in furnace camera, especially for monitoring the working conditions of the material surface in the furnace during the smelting process of the ironmaking blast furnace, and using a computer to process the image and quantitatively describe the material surface airflow Furnace monitoring methods for monitoring the distribution of temperature and temperature, monitoring the working conditions of the chute or bell, and the material flow during charging, and monitoring abnormal furnace conditions such as pipelines and material collapse in the furnace. Video camera is mainly made of video camera body, video recorder (23), monitor (24), digital thermometer (25), computer (26) and color monitor (27). Its advantages are: using a micro camera without moving parts to obtain infrared images in the furnace, and using a computer to process the images; the device is small in size, low in cost, easy to install, easy to maintain and long in life.

Description

A kind of image processing method for the image of plug-in kiln camera

technical field

The invention belongs to the technical field of process monitoring and control of industrial furnaces, and in particular provides an image processing method for images of plug-in furnace cameras. It is a divisional trial of 02121548.0 "A plug-in kiln camera and image processing method" based on the examiner's opinion.

Background technique

In the early 1990s, domestic and foreign researched and developed the "Blast Furnace Roof Temperature Camera" (invention patent, patent No. 90102986) and "monitoring camera" (invention patent, patent No. 94115659). There is also a The thermal imager adopts the mechanical scanning method to obtain the image of the temperature distribution of the material surface, which is used to observe the condition of the material surface and analyze the temperature distribution of the material surface, and is used to guide the operation of the blast furnace, which is a big step forward for opening the black box of the blast furnace. Limited by the technical level and conditions at that time, the camera was large and expensive. The camera was installed outside the furnace shell, the observation hole was large, the moving and protective devices were complicated, the life of the scanning device was short, the amount of protective gas was large, and the production High maintenance costs. During the use of the blast furnace, the problem of ash on the camera lens and window has not been solved. The complicated window valve and mechanical focusing device often break down. Maintenance and repair cannot be carried out during the production process of the blast furnace, and they can only be dealt with when the wind is off , so it has not been widely used.

Contents of the invention

The object of the present invention is: an image processing method for the image of the plug-in kiln camera, especially to monitor the working condition of the material surface in the furnace during the smelting process of the ironmaking blast furnace, and use the computer to process the image quantitatively to describe the material. The furnace monitoring method is to monitor the distribution of surface airflow and temperature, monitor the working status of the chute or the big bell, and the material flow during charging, and monitor the abnormal furnace conditions such as pipelines and material collapse in the furnace.

The used plug-in kiln camera of the present invention is the camera of patent application 02121548.0, and it is made of camera body, video recorder 23, monitor 24, digital thermometer 25, computer 26 and color monitor 27 Composition; camera body is made of camera gun 16, tubular cooler 9, sealing device 15, peep hole 21, purge ring 22, temperature measuring element 20, camera 19. Video camera 19 is contained in the front end of camera gun 16, is inserted in the furnace by the tubular cooler 9 that is installed on the furnace shell flange short pipe 4, guarantees that video camera works below 50 ℃, and the tubular cooler 9 The diameter ranges from 60 to 200mm, and the length ranges from 200 to 3000mm; the double gas protection method of the wind inside the peephole 21 and the purge wind outside the peephole is adopted to make the camera inserted into the furnace shell in the blast furnace under high temperature, high pressure and high dust. , long-term continuous work under harsh conditions of high humidity, the diameter of the peep hole 21 is Φ3-Φ15mm, and the width of the purge ring gap 28 formed between the purge ring 22 and the camera 19 is 0.2-3.0mm; the valve 13 And sealing sleeve 15 double-sealed structures, camera can be checked and maintained in production. The miniature camera of the camera adopts a CCD chip with a wide photosensitive range. Under the condition that there is no visible light in the blast furnace during production, the CCD chip can receive the infrared light emitted by the charge in a certain temperature range and convert it into the surface of the charge in the furnace and equipment. The infrared image of the material is processed by the computer to obtain the quantitative data of the airflow distribution and temperature distribution on the material surface. The camera adopts a pinhole wide-angle lens, and its viewing angle is 90-120°. Only one camera can observe the entire material surface and the working conditions of equipment such as chutes or big bells, which reduces equipment investment and operating costs, and avoids The difficult problem of synthesizing two incomplete images from different angles when using two cameras creates favorable conditions for material surface image processing.

Unlike the existing thermal imager which uses mechanical scanning method to measure the temperature of each point on the material surface in the furnace, and then synthesizes the temperature distribution map of the entire material surface, the present invention uses a camera to obtain the entire material surface at the same time Infrared image of the infrared image, and then use the computer to process the infrared image, according to the correlation between the infrared light intensity and the temperature of the measured object, convert the gray value of each point on the image into a temperature value, and use the pseudo The temperature of the material surface or the distribution of the air flow are displayed on the color monitor in the form of color pictures, numerical pictures, and graphs.

The invention has the advantages of: adopting a miniature camera without moving parts to obtain infrared images in the furnace, and using a computer to process the images; Small aperture, narrow purging ring gap, good protection effect, less protective gas consumption, low operating cost, can be used in various industrial furnaces, especially suitable for bellless or double bell blast furnaces of various volumes.

Description of drawings

Fig. 1 is a kind of overall schematic diagram of the present invention. Among them, blast furnace 1, chute 2, material surface 3, flange short pipe 4, gasket 5, bolt 6, washer 7, nut 8, tube cooler 9, valve 10, drain port 11, valve 12, valve 13, connecting pipe 14, sealing sleeve 15, camera gun 16, valve 17, wiring cap 18, video camera 19, temperature measuring element 20, peep hole 21, purge ring 22, video recorder 23, monitor 24, digital thermometer 25 , Computer 26 and color monitor 27, purge annulus 28.

Fig. 2 is a schematic structural view of the video camera body of the present invention.

Detailed ways

Holes are drilled at appropriate parts of the top furnace shell of the blast furnace 1, and the flange short pipe 4 is welded. The tubular cooler 9 is inserted into the furnace through the gasket 5 and the flanged short tube 4, and the cooler is installed and tightened with bolts 6, washers 7 and nuts 8 to ensure tightness. Water is supplied to the tube cooler 9 from the valve 10, and the water is discharged from the drain port 11 to ensure the cooling effect. Pass the protective gas (nitrogen or clean gas) into the blast furnace from the valve 12, and continuously purge the peep hole 21 through the purge ring gap 28 between the purge ring 22 and the camera 19. Special camera 19 and temperature measuring element 20 are installed at the front end of camera gun 16, inserted into cooler front end by sealing sleeve 15, connecting pipe 14 and valve 13, and protective gas (nitrogen or clean coal gas) passes in the camera barrel from valve 17 , Blow into the furnace from the peephole 21 at the front end of the camera to ensure that the camera lens is isolated from the gas in the furnace, so that the camera can work continuously for a long time under the harsh conditions of high temperature, high pressure, high dust and high humidity in the blast furnace. Because camera gun 16 is sealed by sealing sleeve 15 and valve 13, it can be closed when camera gun 16 is pulled out above valve 13 in the blast furnace production process, and then camera gun 16, video camera 19 and The temperature measuring element 20 is drawn out from the sealing sleeve 15 for inspection and maintenance. Due to the wide photosensitive range CCD chip, under the condition of no visible light in the blast furnace, the CCD chip can receive the infrared light emitted by the charge in a certain temperature range, and convert it into infrared images of the equipment in the furnace such as the material surface 3 and the chute 2. . Since the angle of view of the camera lens reaches 90-120°, only one camera can observe the working conditions of the entire material surface 3, the chute 2 and the furnace probe, etc., creating favorable conditions for image processing of the material surface . The video signal of the camera and the signal of the temperature measuring element are drawn from the sealed junction cap 18, sent to the duty room through a special cable, and connected to the video recorder 23, the monitor 24, and the digital thermometer 25, so that the operator can see in real time And record the operating conditions of equipment in furnaces such as material surface 3 and chute 2 in the furnace, and understand its operating conditions by the operating temperature of video camera 19. The video signal is connected to the computer 26 for image processing at the same time, and the quantitative data of the airflow distribution and temperature distribution on the material surface are displayed on the color monitor 27 in the form of pseudo-color map, numerical map, distribution curve, etc., for guiding the operation of the blast furnace.

Claims (1)

1, a kind of image processing method is carried out to the image of plug-in kiln video camera, it is characterized in that: image processing system is made of video camera body, computer (26) and color monitor (27), and video camera The miniature camera of the instrument uses a CCD chip with a wide photosensitive range. Under the condition that there is no visible light in the furnace during blast furnace production, the CCD chip can receive the infrared light emitted by the furnace material and convert it into an infrared image of the material surface and equipment in the furnace. Use the computer to process the image to obtain the quantitative data of the airflow distribution and temperature distribution on the material surface; according to the correlation between the infrared light intensity and the temperature of the measured object, the gray value of each point on the image is transformed into For the temperature value, the temperature of the material surface or the distribution of the air flow are displayed on the color monitor in the form of pseudo-color map, numerical map, and graph.

Images