JPS6277517A - Burning control system of furnace for nonferrous metal - Google Patents

Abstract

PURPOSE:To be able to judge the condition in the middle of melting with remote monitoring device for the furnace inside by using televisions having picture processing function and burners having variable adjusting mechanism at the same time. CONSTITUTION:A plurality of super high-speed burners 3 are installed at the wall of a furnace 1 with a proper space and a variable direction adjusting mechanism 4 which swings the nozzle head of each burner is placed at each burner 3. And, a plurality of television cameras 5 monitoring the inside of a furnace are placed toward the furnace 1 and their object images are projected on monitor televisions 6. These monitor televisions 6 are connected with a microcomputer 7 having a picture processing device and an output signal emitted from the microcomputer is converted into an analog signal through a D/A converter 8 and introduced into the variable direction adjusting mechanism 4. Thereby, the burners are able to put more fire flames on the unmelted parts of molten materials 2 and then reduction of melting time etc. are carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic combustion control system using an ultra-high speed burner in a melting furnace or holding furnace for non-ferrous metals such as aluminum.

[Conventional technology]

Melting and holding non-ferrous metals is carried out in a furnace equipped with a combustion burner, but conventionally such combustion burners were fixed to the furnace facing in a fixed direction, and combustion was controlled only by adjusting the size of the flame. was.

Furthermore, the inside of the furnace during combustion is monitored by opening the charging door and visually monitoring the melting and holding conditions, and the monitoring results are fed back to the combustion control mainly by manual operation. Specifically speaking in terms of melting furnaces, the actual situation is to judge whether melting is complete or not by estimating the melting time based on the amount of material to be melted, visually checking the melting, and then proceeding to the next work process. .

[Problem that the invention seeks to solve]

In such conventional combustion control methods, since the burner is fixed, the temperature can only be raised locally, and the heat load cannot be balanced evenly throughout the pile of material. For this reason, oxidation of the material due to the localized high-temperature flame is promoted, and metal loss is increased. Furthermore, after the melting is completed, this oxide covers the surface of the molten metal, thereby reducing the temperature rise of the molten metal due to heat insulation.

On the other hand, in the monitoring method in which the melting state is visually observed by opening the charging door, etc.,
Measures against heat leaks are required, and safety issues remain.

An object of the present invention is to provide a combustion control system for a non-ferrous metal furnace that can eliminate the disadvantages of the conventional example, improve safety, and promote energy and labor savings.

[Means for solving problems]

In order to achieve the above object, the present invention provides a burner installed in a furnace with a variable direction adjustment mechanism, and also provides a television camera for monitoring the inside of the furnace, and processes images of objects captured by the television camera. The gist of the present invention is to use a microcomputer to drive the direction variable adjustment mechanism of the burner based on the processing results.

[Effect]

According to the present invention, a monitoring television camera constantly captures the unmelted portion of the material to be melted in the furnace, processes the image of the subject to identify the size of the unmelted portion, and processes the image at ultra-high speed via a microcomputer. This is fed back to the burner's variable direction joint mechanism. The burner is directed based on that signal, directing more flame to the unmelted area.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the combustion control system of the present invention. First, the apparatus used in the present invention will be explained. In the figure, 1 is a furnace, and 2 is a material to be melted, particularly an unmelted portion.

In this furnace 1, a plurality of ultrahigh-speed burners 3 are arranged at appropriate intervals on, for example, the furnace wall, and each burner 3 is provided with a variable direction adjustment mechanism 4 so that its nozzle swings.

In addition, a plurality of television cameras 5 (two in the figure) for monitoring the inside of the furnace 1 are provided to face the inside of the furnace 1, and their subject images are projected onto the monitor television 6.

Further, this monitor television 6 is connected to a microcomputer 7 equipped with an image processing device, and the microcomputer 7 is connected to the variable direction joint mechanism 4 of the burner 3 via a D/A (digital/analog) converter 8. Connected. Note that the microcomputer 7 may be used by connecting one microcomputer for image processing and one for control.

Next, the method of the present invention using such an apparatus will be described.

A plurality of monitoring cameras 5 constantly capture the unmelted portion of the material 2 to be melted, which is a non-ferrous metal such as an aluminum ingot, in the furnace l. The image captured by the television camera 5 is displayed on a monitor television 6, and image processing is performed on the subject to identify the size of the undissolved portion.

The above-mentioned image processing is not limited to grasping the existence and position of the material to be melted 2, but also includes detecting the profile with a certain degree of accuracy. There is a method to extract changed parts from.

In detail, it is necessary to determine the temporal changes in the image from the TV camera, to determine the parts of the image from the TV camera where the brightness changes suddenly, and to determine only significant changes in the size and brightness difference of the obtained information. Examples include determining whether the screen width is correct, and outputting position information regarding the ingot (remaining ingot) for which the screen width has been detected.

FIG. 2 shows an example of a device that performs such image processing.

This image processing device is built into a microcomputer 7, of which a video processing board 9 is used to select television cameras and determine changes in images over time, and has image memory for two systems. Writing/reading operations are performed according to commands from the board, and moving images also pass through this board and are matched in phase with the image memory output.

The video processing board 10 performs hardware image processing such as time difference, edge enhancement, and binarization based on the image signal from the video processing board 9. That is, the difference image between the original image and the memory image is displayed, the outline is determined, and the image is converted into binary image information (the presence or absence of an effective change, etc.).

The arithmetic processing panel 11 outputs the coordinates of two locations in ingots whose screen widths have been detected, in descending order of size and in descending order of distance from the center of the furnace.The hardware configuration consists of a main CPU and two sub-CPUs. The sub CPU interfaces with the control system, controls the operation of the video processing board 9.10, outputs calculation results using data from the sub CPU, operates test functions, etc.
The shape and size are checked from the binary image data, and the results are passed to the main CPU as coordinate values.

Image processing is performed in this way, and the output signal output from the microcomputer 7 is converted into an analog signal via the D/A converter 8 and introduced into the variable direction adjustment mechanism 4 of the burner 3. As a result, the burner 3
Apply more flame to the undissolved parts of the melt to shorten the melting time.

〔Effect of the invention〕

As described above, the combustion control system for a non-ferrous metal melting furnace of the present invention enables remote monitoring of the inside of the furnace, and the status of the melting process can be determined on the television, so the door can be opened from time to time to look inside the furnace. This eliminates manual work and saves labor.

By combining the television's image processing function and a burner with a variable adjustment mechanism, the flame can be focused on the unmelted parts, reducing combustion loss, shortening melting time, and improving productivity. As a result, a large amount of energy can be saved, and metal loss can also be reduced by equalizing the load balance of the heat of the materials in the furnace. Incidentally, according to the system of the present invention, it is possible to reduce the fuel consumption by more than 10% compared to the conventional method of visual monitoring inside the furnace and one fixed burner system.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the combustion control system of the present invention, and FIG. 2 is an explanatory diagram of an image processing device. l... Furnace 2... Material to be melted 3... Burner 4... Direction variable adjustment mechanism 5... Television camera 6... Monitor television 7... Microcomputer

Claims (1)

[Claims] The burner installed in the furnace is equipped with a variable direction adjustment mechanism, and a television camera is installed to monitor the inside of the furnace.The image of the subject captured by the television camera is processed, and based on the processing results, a microcomputer is used. A combustion control system for a non-ferrous metal furnace, characterized in that the burner direction variable adjustment mechanism is driven.