JP2008239907A - Method for determining extent of carbonization in coke oven, and method for carbonizing in coke oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for determining the extent of carbonization, in which a local extent of carbonization in the vicinity of the furnace lid can be determined, and to provide a method for carbonizing in the coke oven. <P>SOLUTION: This method for determining the degree of carbonization is carried out by photographing the image of coke face with a camera 80 for imaging and image-processing the photographed picture at the time when the furnace lid 24 of the coke oven 50 is opened. The method for carbonizing in the coke oven 50 is carried out as follows: based on the result of determination of degrees of carbonization, pushing out is conducted when determined that carbonization is completed, and the furnace lid 24 is closed again and carbonization is continued when the completion of carbonization is not determined. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for determining the degree of progress of dry distillation in a coke oven and a dry distillation method in a coke oven.

  The coke oven 50 shown in FIGS. 4 and 5 has a furnace body 52 in which a carbonization chamber 54 into which coal is charged and a combustion chamber 56 in which gas is combusted are alternately installed. Is partitioned by furnace wall bricks. Coal is heated and dry-distilled into coke by heat transmitted from the combustion chamber 56 in the carbonization chamber 54. Coke oven gas generated from the combustion chamber 56 (volatile components produced as a result of dry distillation of coal, mostly hydrocarbons) is sucked into the dry main 64 by the ejector 62 of the riser 60, and the coke oven gas is used in the facility. Sent to. The produced coke is extruded by the extruder 66 from one side after the furnace lids 24 on both sides of the carbonization chamber 54, that is, the front side shown in FIG. 6 and the opposite side (not shown) are opened. It is loaded on a fire extinguisher 69 through a guide wheel 67 shown in FIG. 7 disposed on the side, carried out, cooled, and used in a blast furnace or the like.

  When charging coal into the carbonization chamber 54, a charging vehicle 70 is used. The charging vehicle 70 travels on a rail 68 laid on the furnace body 52. The charging vehicle 70 is stopped on the charging port 58 on the furnace body 52, the charging port 58 is opened, the hopper 72 of the charging vehicle 70 is connected to the charging port 58, and coal is charged from the charging port 58 to the carbonization chamber 54. Enter.

  In FIG. 5, the illustration of the hood mounted around the charging vehicle 70 is omitted. In the following description, the direction orthogonal to the rail 68 (the left-right direction in FIG. 5) is referred to as the extrusion direction, and the direction in which the rail 68 is laid is referred to as the furnace group direction.

Now, for example, in Patent Document 1, the temperature of coke oven gas generated along with the progress of dry distillation is continuously determined as the degree of progress of dry distillation in the coke oven, that is, whether dry distillation is already completed or not enough. Monitoring is performed based on the judgment logic expressed by the relationship between time and temperature. In general, coke oven gas temperature and calories are often used.
Japanese Patent Laid-Open No. 11-241071

  However, the method as described above cannot determine the degree of local carbonization in the vicinity of the coke oven lid. If the carbonization is not sufficiently performed to the vicinity of the furnace lid, it cannot be said that the carbonization is completed. Further, when coke extrusion is performed with insufficient dry distillation, the amount of exhaust gas increases, exceeding the upper limit of the flow rate in the equipment specifications of the dust collector, and dust is generated in the atmosphere, which poses environmental problems.

  For this reason, in the past, the determination of the degree of local dry distillation in the vicinity of the coke oven lid was made by opening the furnace lid and preventing the coke from being pushed out, and then placing the operator on the extruder or guide car. Boarded and went subjectively by visual inspection.

  However, if the extruder or guide car is remodeled for unmanned operation, the determination of the degree of local dry distillation in the vicinity of the coke oven lid must be performed separately by the operator. Improvements have been desired in that problems such as interference with work may occur and human power may not be secured.

  The present invention has been made in view of the above circumstances, and can determine the degree of local carbonization in the vicinity of the coke oven lid, and can determine the degree of carbonization in the coke oven and the carbonization in the coke oven. It aims to provide a method.

The present invention is as follows.
(1) A method for determining the degree of progress of dry distillation in a coke oven, wherein the degree of progress of dry distillation is determined by imaging a coke surface when the furnace lid of the coke oven is opened and performing image processing.
(2) Image the coke surface when the furnace lid of the coke oven is opened, and determine the cracks occurring on the coke surface and the surrounding coke surface by image processing from their luminance, A method for determining the degree of progress of carbonization in a coke oven, wherein the degree of progress of carbonization is determined from the size.
(3) When it is determined that dry distillation is completed based on the result of determining the degree of dry distillation by the method of (1) or (2) above, when extrusion is performed and it is not determined that dry distillation is complete The method of carbonization in a coke oven is characterized by closing the furnace lid and continuing the carbonization.

  ADVANTAGE OF THE INVENTION According to this invention, the determination method of the progress of dry distillation in a coke oven and the dry distillation method in a coke oven which can determine the progress of local dry distillation in the vicinity of the furnace cover of a coke oven can be provided.

  The best mode for carrying out the present invention will be described below. FIG. 1 is a diagram showing an example of the entire system 100 for carrying out the present invention. 50 is a coke oven. 52 is a furnace body of the coke oven 50. Reference numeral 24 denotes a furnace lid provided in the furnace body 52 of the coke oven 50. FIG. 1 is different from FIG. 4 and shows the side where coke after dry distillation is pushed out, and 67 is a guide wheel.

  On the guide wheel 67, an imaging camera 80 is attached. As the imaging camera 80, for example, a CCD system or a near-infrared system having a thermoview name can be applied particularly preferably. An image captured by the imaging camera 80 is converted into an electrical signal and transmitted to the control device 90 for image analysis.

  FIG. 2 also shows (a) an example in which carbonization is sufficiently performed, and (b) an example in which carbonization is not yet sufficiently performed.

  In the present invention, for the entire system 100 as described above, the coke surface when the furnace cover 24 of the coke oven 50 is opened is imaged and image processing is performed to determine the degree of progress of dry distillation.

  FIG. 3A shows an example of a two-dimensional image of a part of the coke surface captured by the imaging camera 80, taking the case of the CCD system as an example. When the coke surface when the furnace cover 24 of the coke oven 50 is opened is imaged, it appears as a two-dimensional mesh image as shown in FIG. Consider a case where a crack on the coke surface appears on the image.

  In FIG. 3A, when the lower left corner of the lower left corner pixel partitioned by the two-dimensional mesh is set to the origin, the X axis in the horizontal direction and the Y axis in the vertical direction, The center of the diagonal line can be used as a representative point, and its coordinates are defined as X = X1 and Y = Y1. Then, the coordinates of each pixel can be determined as X = Xi and Y = Yj.

  Assume that for a certain pixel represented by an X coordinate X = Xi and a Y coordinate Y = Yj, the luminance at that pixel is I (Xi, Yj).

  FIG. 3B shows a luminance distribution when X = Xk pixels are viewed in a row in the Y direction. If there is a disturbance component such as indirectly reflected light or back light on the coke surface, an error occurs, but it is the crack portion that has the maximum luminance in the Y-axis direction. The spread in the Y direction is not limited to one pixel, but appropriate threshold values I1 and J1 are determined, and if the luminance of a certain pixel is I1 or less, the error can be eliminated by considering the luminance as zero as the noise, and the luminance is J1 or more. If so, the extent of the spread can be understood by considering it as a crack.

  In the above description, the crack portion is determined from the luminance distribution when X = Xk pixels, which are pixels in the X direction, are viewed in the Y direction. For a pixel having a direction, a crack portion may be determined from a luminance distribution when viewed in the X direction.

  In FIG. 3B, ΔY is the vertical length of one pixel, and 2Nw is the number of pixels corresponding to the case where the crack extends to the tip of the arrow.

  If the number of pixels exceeding the threshold value J1 is greater than a certain value, or if the portion corresponding to a crack exceeding the threshold value J1 is converted into the number of pixels and Nw in the vertical direction and Nh in the horizontal direction, both Nw and Nh are constant. When the above region is a certain level or more in the entire image, or when the crack portion is a certain size or more, it can be determined that the degree of progress of coke dry distillation is sufficient.

  Alternatively, from the relationship between the size of the crack portion and the degree of progress of coke dry distillation determined in advance, what is the degree of progress of the coke dry distillation when the size of the crack portion is any? A table (correspondence table) or a regression equation may be created, and the actual degree of cracks in the actually captured image may be captured to determine the degree of coke dry distillation.

  It is desirable that the field of view of the imaging camera 80 is large enough to cover the entire coke surface when the furnace cover 24 of a certain carbonization chamber 54 is opened. It is possible to determine the degree of progress of dry distillation, or it is possible to cover the whole by scanning a size that covers only a part.

  In this way, in the present invention, the coke surface when the furnace cover of the coke oven is opened is imaged, and cracks occurring on the coke surface and surrounding coke surfaces are obtained from the luminance by image processing. The progress of dry distillation can be determined from the size of the crack portion.

  Furthermore, if it is determined that carbonization is complete based on the determination result, extrusion is performed, and if it is not determined that carbonization is completed, the furnace lid is closed and the carbonization is continued. As a result, the coke can be extruded without sufficient dry distillation, and environmental problems such as increased exhaust gas generation and dust generation in the atmosphere can be prevented. .

The figure for demonstrating one embodiment of this invention (A) The figure which shows the example when dry distillation is fully performed (b) The figure which shows the example when dry distillation is not fully performed yet (A) The figure which shows the example of the two-dimensional image imaged with the camera for imaging (b) The figure which shows distribution of the brightness | luminance at the time of seeing continuously in the Y direction about the pixel of X = Xk The figure for demonstrating the example of the coke oven which is an application object of this invention The figure for demonstrating the example of the coke oven which is an application object of this invention The figure for demonstrating the example of the coke oven which is an application object of this invention The figure for demonstrating the example of the coke oven which is an application object of this invention

Explanation of symbols

2, 2a, 2b, 2c Backstay 21 Upper wall plate 22 Lower wall plate 23 Door frame 24 Furnace lid 50 Coke oven 52 Furnace body 54 Carbonization chamber 56 Combustion chamber 58 Charge pipe 60 Elevator 62 Ejector 64 Dry main 66 Extruder 67 Guide wheel 68 Rail 69 Fire extinguisher 70 Charging car 72 Hopper 76 Dust collector 78 Suction machine 80 Camera 90 Control device 100 Entire system for realizing the present invention

Claims (3)

A method for determining the degree of progress of dry distillation in a coke oven, wherein the degree of progress of dry distillation is determined by taking an image of the coke surface when the furnace lid of the coke oven is opened and processing the image. The coke surface when the furnace cover of the coke oven is opened is imaged, and cracks occurring on the coke surface and surrounding coke surfaces are obtained from their luminance by image processing, and from the size of the crack portion A method for determining the degree of progress of dry distillation in a coke oven, wherein the degree of progress of dry distillation is determined. Based on the result of determining the degree of dry distillation by the method of claim 1 or 2, when it is determined that dry distillation is completed, extrusion is performed, and when it is not determined that dry distillation is complete, the furnace lid is closed, A carbonization method in a coke oven characterized by continuing carbonization.