JPS63188749A - Instrument for measuring char bed of recovery boiler - Google Patents

Abstract

PURPOSE:To obtain overall information on the stereoscopic shape, etc., of a char bed by forming the titled instrument in such a manner that image synthesis is executed by using plural two-dimensional image pickup devices, etc., adjusted to the measurement wavelength suitable for measuring the char bed. CONSTITUTION:A black liquor 2 is ejected into a recovery boiler 1 and is burned to form the mound of the char bed 3. The combustion heat generated at this time heats the water in heaters 4 in the upper part of the boiler 1 to form steam which rotates a turbine to generate electric power, etc. The radiation energy from the char bed 3, etc., is detected by the plural two-dimensional image pickup devices 5 provided on the wall surface of the boiler 1. The outputs of the device 5 are subjected to the image synthesis by an image synthesizing means and are computed by a computing means to display the stereoscopic shape, temp. pattern, etc., of the char bed 3 by a display means. The overall information on the stereoscopic shape, etc., of the char bed 3 is, therefore, obtd. and the combustion of the boiler 1 is satisfactorily controlled.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention is a device for measuring charbed obtained by burning waste liquid (black liquor) after cooking wood chips to obtain pulp in a recovery boiler. It is related to.

[Prior art] The black liquor prepared after separating the pulp contains NaOH, Na
2 Contains S, Na2co3, etc., and mixes Na2SO with a mixer.
4 is mixed, a reduction reaction is caused in a recovery boiler, and the mixture is combusted to form a char bed.

[Problems to be solved by this invention] If the shape, temperature, etc. of this charbed pile are known, it is possible to burn it efficiently, but due to the influence of flames, etc. Even when observed through cobalt glass, identification was not sufficient, and the shape and temperature of charbeds were usually not accurately measured.

In view of the above points, an object of the present invention is to provide a char bed measuring device for a recovery boiler that can more accurately measure the temperature, three-dimensional shape, etc. of the char bed.

[Means for Solving the Problems] The present invention provides measurement wavelengths of approximately 0.82 to 1.4 μm by a plurality of two-dimensional image devices provided on the wall surface of a recovery boiler.
Collection in which a charbed image is synthesized using at least one wavelength band of 1.5 to 1.9 μm, or 2°0 to 2.4 μm, or at least one wavelength of each wavelength band. This is a boiler char bed measuring device.

[Embodiment] FIG. 1, FIG. 2, and FIG. 3 are configuration explanatory diagrams showing an embodiment of the present invention.

In the figure, black liquor 2 is spouted into the recovered boiler and burned, forming a mountain of char bed 3.

The combustion heat generated at this time heats water in the superheater 4 above the recovery boiler 1 to steam, which turns the turbine and obtains electric power. Then, the radiant energy from the char bed 3 and the like is detected by a plurality of two-dimensional ratio devices 5 each using a COD or the like provided on the wall of the black liquor recovery boiler 1 as an image element.

The output of the two-dimensional imaging device 5 is synthesized into images by an image synthesizing means 6, and is computed by a computing means 7.
The three-dimensional shape and temperature (
display heat) patterns (images), etc.

As shown in FIG. 3, this two-dimensional imaging device 5 is housed in a protective tube 51 that is water-cooled as necessary through a transmission window 50 on the wall of the recovery boilerco, and is installed on the front side or inside (inside the image carrier). A filter 9 whose wavelength is suitable for measuring the char bed 3 is provided at the front). The transmission wavelength of this filter 9 is determined as follows.

In the black liquor recovery boiler 1 where the char bed 3 is being burned, NaOH, Na2S, Na2CO3, Na230
4, H20, CO2, Na, etc., and it is necessary to measure at wavelengths excluding spectrum lights of wavelengths related to these.

Na gas has a spectrum below 0.819 μm, and H
20 gases are mainly 1.43.1.94.2.5-3
．． There is absorption near 0 μm, and other elements and groups have absorption at several μm.
I can understand the spectrum more than that.

In order to eliminate these influences, the measurement wavelength of the two-dimensional imaging device 5 (transmission wavelength of the filter 9) is set to approximately 0582 to 1.4.
Wavelength bands such as μm, 1.5 to 1.9 μm, or 2, Q to 2.4 are effective. That is, at least one wavelength band from these wavelength bands, or at least one arbitrary wavelength from these wavelength bands, is selected and used. Alternatively, a combination of these may be used.

This makes it possible to obtain the shape and temperature pattern of the char bed 3.

The image synthesis means 6 performs image synthesis, and the calculation means 7 performs calculation of a three-dimensional image as follows.

As shown in the plan view in Figure 2, the char bed is so large that it cannot be covered by one two-dimensional imaging device. The device 5 is installed horizontally, and one two-dimensional imaging device 5 is installed above each side of the char bed in order to obtain an image from above the char bed as shown in the explanatory side view of FIG. Prepare a total of 20 pieces. The four outputs of the two-dimensional imager 5 for each side are shown in FIG. 4 (a>, (b), (C),
(d>) in Figure 4 (e), (f), (g), (
As shown in h), the patterns on each side of the char bed 3 are synthesized by the image synthesizing means 6. The outputs of the upper four two-dimensional imaging devices 5 are shown in FIG. 4 (11), and the planar pattern of the char bed 3 is 1q as shown in FIG. Figure 4(e), (f>, (C1
), (h) 4 side views of char bed 3 and Fig. 4 (j)
A three-dimensional image is synthesized from the plan view by the calculating means 7, and is displayed on the display means 8 as shown in FIG. More detailed information such as patterns can be obtained.

Incidentally, depending on the size of the char bed 3, etc., a necessary number of two-dimensional imaging devices 5 may be provided in necessary parts.

[Effects of the Invention] As described above, the present invention performs image synthesis using a plurality of two-dimensional imaging devices with measurement wavelengths suitable for char bed measurement. This will enable better control of combustion in the black liquor recovery boiler, greatly improving operational efficiency.

[Brief explanation of the drawing]

1, 2, and 3 are configuration explanatory diagrams showing one embodiment of the present invention, and FIG. 4 is an explanatory diagram of image synthesis.

Claims (1)

[Scope of Claims] 1. In a recovery boiler that burns black liquor to form a char bed, a measuring wavelength of about 0.
82-1.4 μm, 1.5-1.9 μm, or 2.0
A plurality of two-dimensional imaging devices using at least one wavelength band of ~2.4 μm wavelength band or at least one wavelength of each wavelength band, and an image of the charbed from the output of the plurality of two-dimensional imaging devices. A char bed measuring device for a recovery boiler, characterized in that it is equipped with an image synthesizing means for synthesizing images. 2. Calculating means for outputting an image of the three-dimensional shape of the char bed from the output of the image synthesizing means and calculating dimensions, volume, and other information of the char bed. Charbed measuring device for the recovery boiler described.