JPH01207649A - Measuring method for unburnt component in combustion ash - Google Patents

Abstract

PURPOSE:To take an measurement automatically in a short time of several seconds by irradiating the top surface of smoothed combustion ashes with constant-illuminance light together with a standard brightness sample and finding the quantity of unburnt components in the ashes from the ratio of measured brightness. CONSTITUTION:The combustion ashes 5 which are sampled 2 continuously from a dust coal boiler 1 are uniformed by a mixer 3 and fallen on a feeder 4. Consequently, the ashes have surface unevenness removed by a smoothing plate 6 and is irradiated by a light source 7 which has an irregularity in the quantity of light removed by using a constant voltage DC power source together with the standard brightness sample 9. The surface of the combustion ashes 5 which have no shadow because of the smoothing and is irradiated by the light source 7 is picked up by a television camera 8 together with the sample 9. The signal of picture elements of this camera 8 is A/D-converted 10 and an image processor 11 calculates the ratio of the mean brightness between the surface of the combustion ashes 5 and the sample 9. Then an unburnt component arithmetic part 12 calculates the quantity of unburnt components in the combustion ashes 5 from the relation between an unburnt component ratio which is found experimentally and the ratio of the brightness and outputs the result to an output device 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring unburned content in combustion ash discharged from, for example, a pulverized coal boiler.

[Conventional technology]

In order to measure the amount of non-union contained in the combustion ash of a conventional pulverized coal boiler, it is common to sample the ash, completely burn it, and then calculate it from the change in weight before and after that, and these operations are performed by manual analysis. The analysis time for each sample was over an hour.

[Problem to be solved by the invention]

Analysis data for unburned content in combustion ash is important data for understanding the combustion status of pulverized coal boilers, etc., but conventional analysis is usually done manually and takes at least an hour to complete. Therefore, it was not possible to use the analytical data to directly optimize combustion online by feeding it back to the boiler control device as combustion conditions. It is clear that if the unburned content of ash can be measured automatically in a short time, it will greatly contribute to the advancement of expert systems used for optimal combustion control and high-efficiency operation of boiler thermal power. Furthermore, automation can omit the analysis work conventionally performed by experts, and highly accurate analysis data without individual differences can be obtained, which has a significant effect on reducing analysis costs.

The object of the present invention is to provide a method that can automatically measure the unburned content in ash in a short time (within several seconds), which solves the above-mentioned problems.

[Means to solve the problem]

The top surface of the accumulated combustion ash was smoothed, and the top surface of the ash and the standard brightness sample were irradiated with light at a constant intensity to measure the ratio of the brightness of the top surface of the ash and the brightness of the standard brightness sample. Based on the relationship between the unburned content ratio and the brightness ratio, calculate the amount of unburned content in the ash.

[Effect]

In the above, the deposited combustion ash has a smooth surface, so it is irradiated with light of a constant illuminance together with the standard brightness sample without creating a shadow. The light irradiated on the combustion ash and the standard brightness sample is reflected, the reflected light is imaged by a television camera, and the ratio of the respective brightnesses is measured by an image processing device. A high correlation can be obtained between the above luminance ratio and the proportion of unburned matter contained in the burnt ash. The amount of unburned content is determined by a calculation device.

The above method eliminates the need for the conventional manual analysis work by experts, making it possible to obtain highly accurate analysis data with no individual differences, and to measure the amount of unburned matter in the burnt ash without directly touching the ash. Since it can be measured, maintenance of the measurement device is easy, and since the amount of unburned matter in combustion ash can be automatically measured online in a short time, it can be fed back to the control device in pulverized coal boilers, etc. Online Combustion Optimization F: Expert systems used for optimal combustion control and high-efficiency operation have become more sophisticated.

〔Example〕

An apparatus used in an embodiment of the present invention will be explained with reference to FIG.

The apparatus of this embodiment shown in FIG.
A mixer 3 is connected to the pulverized coal boiler through a feeder number, which is provided below the mixer 3 and consists of a belt conveyor, with a smooth plate 6, a light source 7, a television camera 8, and a standard brightness sample lv9 thrown on the upper side. , the television camera 8 includes an A/D conversion unit 10, an image processing device 11, and an unburned content calculation section 1.
The output device 113 is connected via 21.

In this example, the amount of unburned matter contained in the combustion ash of pulverized coal is measured by the above device.

In the above, combustion ash 5Vi continuously sampled from the pulverized coal boiler by the ash sampling device 2 is supplied to the mixer 3, homogenized by the mixer 3 button, and dropped onto the feeder 4.

The burnt ash 5 dropped onto the feeder 4 has its surface unevenness removed by a smoothing plate 6, and is irradiated with the standard brightness sample 9 by a light source 7 using a constant voltage DC power source to eliminate unevenness in the amount of light. Ru. Combustion ash 5 smoothed by the smoothing plate 6 and irradiated by the light source 7 without creating a shadow
The surface of is imaged by a television camera 8 together with a standard brightness sample 9. The signal from the 80-pixel television camera that captured the surface of the ash 5 and the standard brightness sample 9 is converted into a digital signal by the A/D conversion unit 10 and sent to the image processing device 11, which The ratio of the average brightness of the surface of the ash 5 imaged by the television camera 8 and the 100 to 200 screens of the standard sample is 1/I.

is calculated, and the signal is sent to the unburned content calculation section 12, which calculates the amount of unburned content in the combustion ash 5, and outputs it to the output device 13.

Amount of unburned matter in the above pulverized coal combustion ash and brightness ratio I/
1. #F has a relationship as shown in FIG. 2 for each coalescence within an error range of about 1 inch.
The data shown in the figure is input, and the calculation section 12 uses the data to calculate the amount of unburned matter.

As a result of the above, the manual analysis work of traditional hot ray technicians is no longer necessary, and highly accurate analysis data with no individual differences can be obtained. Maintenance of the Tomome measuring device, which can measure the amount of unburned ash, is also easy.Furthermore, since the amount of unburned ash in the combustion ash can be automatically measured online in a short time, feedback can be sent to the boiler control device. We hope that this will allow us to optimize combustion online, and to improve the sophistication of the Ex-Heart system used for optimal combustion control and high-efficiency operation.

Although this example measures the unburned content in the combustion ash of pulverized coal, it can also be used to measure the unburned content in the combustion ash of solids and fuels such as petcoke.

〔Effect of the invention〕

The present invention irradiates the top surface of the smoothed combustion ash with light of a constant illuminance together with a standard brightness sample, measures the ratio of each brightness, and determines the amount of unburned matter contained in the combustion ash from the ratio of the same brightness. By determining this, the conventional manual analysis work by experts is no longer necessary, and highly accurate analysis data with no individual differences can be obtained. The ability to measure the amount of burnt material makes it easier to maintain the measuring device, and the amount of unburned material in combustion ash can now be automatically measured online in a short period of time (within a few seconds), making it easier for pulverized coal boilers. For example, in order to optimize combustion online by providing feedback to the control device, efforts have been made to improve the sophistication of expert systems used for optimal combustion control and high-efficiency operation.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an apparatus used in one embodiment of the present invention;
Figure ri Brightness ratio of combustion ash 1/1. It is an explanatory view of the relationship between and the amount of unburned matter. 1...Pulverized coal boiler, 2...Ash sample device, 3.
...Mixer, 4...Feeder, 5...Combustion ash, 6.
...Smooth plate, 7...Light source, 8...TV camera, 9
. . . Standard luminance sample, 10 . . . A/D conversion unit, 11 . . . Image processing device, 12 . Agent: Patent attorney Akira Sakama, 2 other people, 1st meter

Claims (1)

[Claims] The top surface of the accumulated combustion ash was smoothed, and the top surface of the ash and the standard brightness sample were irradiated with light at a constant intensity to measure the ratio of the brightness of the top surface of the ash and the brightness of the standard brightness sample. A method for measuring unburned content in combustion ash, characterized in that the amount of unburned content in the ash is determined from the relationship between the determined unburned content ratio and the brightness ratio.