JPH02302509A - Controlling method for surface type melting furnace - Google Patents

Abstract

PURPOSE:To always, properly control the combustion operation without influences of individual differences by judging the combustion state of a main combustion chamber according to patterns previously stored in an image processing unit. CONSTITUTION:Patterns of two or more kinds of molten slags and combustion states corresponding to the patterns of molten slags are previously stored in an image processing unit. For example, in case a molten slag 34 has a thin, lengthy shape, it is stored as a state that the temperature in a furnace is high, and in case the shape of the molten slag is not displayed, it is stored as a state that waste refuse 26 blocks between a furnace outer drum 21 and a furnace inner drum 23 and the supply of the waste refuse 26 to the main combustion chamber 27 is in short. The displayed shape of molten slag 34 is compared with the stored shape of molten slag 34 to detect an identical pattern, and the state of the main combustion chamber 27 at present is judged as a combustion state previously stored in the image processing unit 33 corresponding to the detected pattern to control the combustion operation of a melting furnace. Therefore, the combustion operation of the melting furnace is controlled without influences of individual differences.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for controlling a surface melting furnace.

2. Description of the Related Art A conventional surface melting furnace is shown in FIG. 6, for example. In FIG. 6, a slag port 2 is formed at the bottom of the outer furnace cylinder 1, and an inner furnace cylinder 3 is disposed inside the furnace outer cylinder 1.

Further, the bottom of the furnace cylinder 3 is formed in the furnace ceiling 4. A material to be melted 5 is arranged in an annular shape inside the furnace outer cylinder 1, and the material to be melted 5 is threaded from the lower end peripheral edge of the furnace inner cylinder 3 toward the opening peripheral edge of the slag port 2. It forms a sloping surface. Further, a space between the lower surface of the furnace ceiling portion 4 and the inclined surface of the material to be melted 5 is formed in the combustion chamber 6 . The molten slag 7 melted in the combustion chamber 6 was discharged from the slag port 2.

Problems to be Solved by the Invention However, in the above-described configuration, an operator visually inspects the inside of the combustion chamber 6 to judge the combustion state, and controls the combustion operation of the melting furnace based on the operator's judgment result. As a result, there were individual differences in the judgment results, and accurate control was not always possible.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for controlling a surface-type melting furnace that can determine the combustion state based on certain criteria and can always perform accurate combustion operation.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a slag port that is melted in a main combustion chamber formed inside a furnace outer cylinder and that is connected to a slag port that is opened at the bottom of the furnace outer cylinder. The molten slag dripping into the secondary combustion chamber of the flue body provided below is imaged with an industrial television camera, and the image signal of the imaged image of the molten slag is sent to an image processing device and stored in the image processing device in advance. The pattern shapes of the plural types of molten slags detected and the shape of the imaged molten slag are compared to detect matching pattern shapes, and the combustion state is stored in advance in the image processing device in accordance with the detected pattern shapes. is determined as the current combustion state of the main combustion chamber, and the combustion operation of the melting furnace is appropriately controlled based on the result of this determination.

Effects With the above-described configuration, the combustion state of the main combustion chamber is determined based on objective criteria, that is, the pattern shape stored in advance in the image processing device, without involving the subjectivity of the control operator. The combustion operation of the melting furnace can be controlled accurately at all times without being affected by individual differences.

EXAMPLE An example of the present invention will be described below based on the drawings. In FIGS. 1 to 5, the furnace outer cylinder 21 has a cylindrical shape and has a slag port 22 opened at the bottom. A furnace inner cylinder 23 shaped like a cylinder with a bottom is arranged inside the furnace outer cylinder 2I, and a combustion burner 25 is installed in a furnace ceiling 24 formed at the bottom of the furnace cylinder 23. It is being Furthermore, inside the furnace outer cylinder 21 , waste 26 which is a material to be melted is accumulated in an annular shape along the periphery of the furnace inner cylinder 23 . The waste 26 forms a forest-like slope from the lower edge of the furnace cylinder 23 to the opening edge of the slag port 22, and this slope is connected to the lower surface of the furnace ceiling 24. A space in between is formed into a main combustion chamber 27. Also, slug port 2
A flue body 28 is arranged below the flue body 2.
A secondary combustion chamber 29 is formed by penetrating in the vertical direction. Furthermore, an auxiliary burner 30 is provided in the secondary combustion chamber 29. The flue 3 communicates with the secondary combustion chamber 29.
1 is formed horizontally, and an industrial television camera 3
2 is provided in the flue body 28 so that the inside of the secondary combustion chamber 29 can be photographed through the flue 3I.

Further, the industrial television camera 32 is connected to an image processing device 33 formed by a CPU and a monitor.

Hereinafter, the effects of the above configuration will be explained.

The waste 2B is melted by the flame of the combustion burner 25 and self-combustion in the main combustion chamber 27 formed inside the furnace outer cylinder 21, and is transferred from the slag port 22 to the secondary combustion chamber 29 of the flue body 28 as molten slag 34. It is dripped.

This dripping molten slag 34 is captured by an industrial television camera 32.
Take an image with The image at this time is as shown in FIG. 2, and since the flame of the auxiliary burner 30 and the like are captured at the same time, it is difficult to distinguish the shape of the molten slag 34. Therefore, the image signal of the imaged image of the molten slag 34 is transmitted to the image processing device 33 and subjected to image processing.

This image processing detects the brightness level in each pixel of the captured image, and based on the detected brightness level, a third
A frequency graph as shown in the figure is obtained, and the shape formed by the pixels at the brightness level in a certain range A is defined as the shape of the molten slag 3.
It is calculated as the shape of 4.

Then, the pattern shapes of a plurality of types of molten slag 34 and the combustion states corresponding to the pattern shapes are stored in the image processing device 33 in advance. The pattern shape and combustion state to be stored in advance in the image processing device 33 include, for example, as shown in FIG. As shown in FIG. 5, when the molten slag 34 is not imaged, the waste 2B is clogged between the furnace outer cylinder 2 and the furnace inner cylinder 23, and the waste 26 is not in contact with the main combustion chamber 27. Remember that there is a shortage of supply. Then, the imaged shape of the molten slag 34 is compared with the stored shape of the molten slag 34, a matching pattern shape is detected, and the pattern shape is stored in advance in the image processing device 33 in correspondence with the detected pattern shape. The main combustion chamber 2
7, and the combustion operation of the melting furnace is appropriately controlled based on the result of this determination.

As a result, the combustion state of the main combustion chamber 27 can be determined based on objective criteria, that is, the pattern shape stored in advance in the image processing device 33, without involving the subjectivity of the control operator. The combustion operation of the melting furnace is always accurately controlled, without being influenced by individual differences.

Effects of the Invention As described above, according to the present invention, the combustion state of the main combustion chamber is objectively determined based on the pattern shape stored in advance in the image processing device 33, so that it is possible to The combustion operation of the melting furnace can always be accurately controlled without being affected.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing one embodiment of the present invention, Fig. 2 is an image taken by an industrial television camera, Fig. 3 is a frequency graph for each brightness level of each pixel in the image, and Fig. 4 5 and 5 are diagrams of the pattern shapes of molten slag, respectively, and FIG. 6 is a diagram of the overall configuration of a conventional surface type melting furnace. 21...Furnace outer cylindrical body, 22...Slag port, 23...
... Furnace cylinder body, 27 ... Main combustion chamber, 28 ... Flue body, 29 ... Secondary combustion chamber, 32 ... Industrial television camera, 33 ... Image processing device, 34 ...molten slag.

Claims (1)

[Claims] 1. Melted in the main combustion chamber formed inside the furnace outer cylinder,
An image of the molten slag dripping from the slag port opening at the bottom of the furnace outer cylinder into the secondary combustion chamber of the flue body provided below the slag port with an industrial television camera. A signal is sent to an image processing device, and the pattern shapes of multiple types of molten slag stored in advance in the image processing device are compared with the shape of the imaged molten slag to detect a matching pattern shape, and the detected pattern is A surface type method characterized in that a combustion state stored in advance in an image processing device corresponding to the shape is determined as the current combustion state of the main combustion chamber, and the combustion operation of the melting furnace is appropriately controlled based on the result of this determination. How to control a melting furnace.