JPH0611950B2 - Char bed 2D information processing system for recovery boiler - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus used for operation management of a recovery boiler in a pulp production process, and particularly monitors and controls a char bed formed in the recovery boiler. Char bed for two-dimensional information processing device.

[Conventional technology]

Generally, in a pulp production process, a recovery boiler is used which burns black liquor generated as a waste liquid from the chip cooking process to generate steam used for power generation and the like, and recovers a chemical raw material for chip cooking. In this recovery boiler, when the black liquor is injected into the furnace by the black liquor injection mechanism, the black liquor is suspended and dried to form a char bed at the bottom of the furnace, and steam is generated by burning the char bed. The drug raw material is recovered by the generation reaction and the reduction reaction generated at that time.

In recent years, energy saving and labor saving have been desired also in the pulp production process, and for that purpose, stabilization of the operation of the recovery boiler and improvement of thermal efficiency have become problems. In order to realize these, it is important to form and hold the char bed at a proper position and in a proper shape.

Therefore, conventionally, a peep window is provided on the furnace wall of the recovery boiler, and the operator monitors the charbed shape from this peek window,
The char bed formation position and shape were controlled by manually adjusting the black liquor injection mechanism, the black liquor temperature, the combustion air flow rate, etc., if necessary.

[Problems to be solved by the invention]

However, since this conventional char bed control means requires manpower, it cannot be constantly monitored and the char bed shape cannot be accurately grasped. Therefore, there is a problem in accuracy, and it has been difficult to achieve stable operation and high efficiency. In addition, if the char bed collapses or a partial combustion failure, a so-called blackout, occurs, detection of such an abnormality is delayed, and quick recovery measures cannot be taken, which may adversely affect the plant operation. It was

Therefore, the present invention can constantly and automatically monitor the char bed with high accuracy, can stabilize the operation of the recovery boiler and improve the efficiency, and can promptly respond even if an abnormality occurs in the char bed, and operate the plant. An object of the present invention is to provide a char bed two-dimensional information processing apparatus for a recovery boiler that does not hinder the operation.

[Means for Solving the Problems] The present invention, in order to solve the above problems and achieve the object,
A radiation thermometer, which is sensitive to the wavelength band that is not easily affected by the radiation of the gas inside the recovery boiler, is installed on the furnace wall of the recovery boiler, and the field of view of this radiation thermometer is scanned in a predetermined direction by the scanning mechanism, and the radiation temperature is measured. The charbed two-dimensional shape or the charbed surface temperature distribution is acquired as the two-dimensional information of the charbed based on the radiant energy intensity distribution output from the meter. In addition,
At this time, it is also possible to detect the end points of the char bed based on the radiant energy intensity distribution, and take these end points into consideration to obtain them.

[Action]

According to the present invention, by taking such means, the two-dimensional shape diagram or the surface temperature distribution diagram of the char bed is always displayed automatically and with high accuracy.

〔Example〕

Before describing the embodiments of the present invention, the principle of the present invention will be described first. Generally, if you measure the temperature inside the boiler with a radiation thermometer that is sensitive to the wavelength band that is not easily affected by the radiation in the gas inside the recovery boiler, you can see the char bed formed in the boiler in the field of view. The output of the radiation thermometer is significantly different from that of the case without it. Therefore, when the field of view of the radiation thermometer is moved, its output changes greatly at the end points of the char bed. Therefore, the present invention detects and displays the shape of the char bed by utilizing the output change of the radiation thermometer. Further, the surface temperature of the char bed can be detected from the output of the radiation thermometer. Since the surface temperature of the char bed is important information for managing the combustion state in the boiler, the char bed surface temperature distribution is also displayed.

The present invention is realized based on the above principle, and one embodiment of the present invention will be described below.

FIG. 1 is a system diagram showing the configuration of an embodiment of the present invention.
In the figure, 10 is a recovery boiler, and this boiler 1
A char bed 11 is formed on the furnace bottom of No. 0 by the black liquor sprayed by a black liquor spraying mechanism (not shown) being floating-dried and landing.

Reference numeral 12 denotes a radiation thermometer. The radiation thermometer 12 converts the radiation energy detector 13 provided on the side wall surface of the recovery boiler 10 and the radiation energy intensity detected by the radiation energy detector 13 into temperature data. And a temperature signal transmitter 14 that transmits momentarily. The radiant energy detector 13 detects the radiant energy from that viewpoint, and in particular, in order to distinguish between the radiant energy of the char bed 11 and the radiant energy of the gas body inside the boiler, the influence of the radiation of this gas body is detected. It is set to have sensitivity in a wavelength band that is hard to receive.

FIG. 2 is a diagram showing the relationship between the measured wavelength (horizontal axis) and the extinction coefficient (vertical axis) as the radiant energy intensity in the in-reactor gas body A and the char bed B. As is clear from the figure, since the extinction coefficient of the gas A in the furnace becomes smaller than that of the char bed B in the vicinity of the measurement wavelength of 3.7 μm, the detector having the measurement wavelength of 3.8 μm in the far infrared region. With the use of, it becomes possible to perform detection in a state in which the gas body A in the furnace is unlikely to be affected. Even when the measurement wavelength is 5 μm or more, the gas body A in the furnace is
The extinction coefficient is smaller than that of the char bed B, but the detector for this measurement wavelength of 5 μm or more is not suitable because it requires special specifications and is effective.

In addition, the radiant energy detector 13 includes a scanning mechanism 15
The radiant energy detector 13 can be horizontally scanned from the viewpoint in the horizontal direction as shown in FIG. 3 (a) or in the vertical direction as shown in FIG. 3 (b).
The scanning position of the viewpoint is detected by the position signal transmitter 16 and is transmitted momentarily as position data. As the scanning mechanism 15, a means for scanning only the viewpoint of the radiant energy detector 13 in a fan shape,
A means for providing a rail in the scanning direction and moving the radiant energy detector 13 itself along the rail may be considered.

On the other hand, the temperature data output from the temperature signal transmitter 14 and the position data output from the position signal transmitter 16 are taken into the microcomputer 18 by the input / output interface 17 and the CPU 20 via the data bus 19. Sent to. The CPU 20 processes each of the above-mentioned data based on a processing program stored in advance in the program ROM 21, stores the data processing result in the RAM 22 as necessary, and stores the data in the char bed 11.
The three-dimensional shape and the surface temperature distribution are obtained, and the two-dimensional shape and the surface temperature distribution of these charbeds 11 are
Two-dimensional display 24 via input / output interface 23
It is what is displayed in.

FIG. 4 is a block diagram showing a functional configuration of the microcomputer 18. The microcomputer 18 first fetches temperature data and position data into the CPU 20 by the data input means 31, smoothes these data by the data processing means 32, and obtains the detected temperature corresponding to the scanning position of the viewpoint of the radiant energy detector 13. The obtained result is sequentially stored in the RAM 21.

FIG. 5 shows an example of the data stored in the RAM 21. In this case, the recovery boiler along one scanning line when the scanning mechanism 15 horizontally scans the viewpoint of the radiant energy detector 13 is used. The radiant energy intensity distribution within 10 is shown.

Next, the RAM 2 is detected by the edge position detecting means 33.
The data stored in 1 is called to detect the end point or edge position of the char bed. As the edge position detecting means 33, for example, as shown in FIG. 5, a slice level L is set at a position 90% of the peak temperature with respect to the above data.
Is provided, and the positions at which the temperature corresponding to the slice level L is applied may be set as the edge positions P1 and P2. The edge positions P1 and P2 detected by the edge position detecting means 33 are converted into coordinate values according to the display mechanism of the two-dimensional display 24 by the coordinate converting means 34, and then via the input / output interface 23. It is output to the two-dimensional display 24 and displayed on the two-dimensional display 24. Hereinafter, the edge positions of the char bed 11 are sequentially detected according to the scanning of the radiant energy detector 13 and displayed on the two-dimensional display 24, so that the two-dimensional display is completed at the end of the plane scanning of the radiant energy detector 13. The two-dimensional shape of the char bed is displayed on the display 24.

On the other hand, based on the edge positions P1 and P2 of the char bed 11 detected by the edge position detecting means 33, the data stored in the RAM 21 is called by the inter-edge temperature distribution detecting means 35, and the edge position P1. , P2
The temperature distribution between them is detected. The detected temperature distribution between the edge positions P1 and P2 is converted into coordinate values according to the display mechanism of the two-dimensional display 24 by the coordinate conversion unit 36, and then,
It is displayed on the two-dimensional display 24 as a temperature distribution of the surface of the char bed.

In this embodiment having such a configuration, the radiant energy detector 13 having a sensitivity in a wavelength band that is hardly affected by the radiation of the gas inside the recovery boiler is horizontally scanned by the scanning mechanism 15 in the horizontal or vertical direction. The temperature signal transmitter 14 outputs temperature data every moment according to the intensity of the radiant energy, and the position signal transmitter 16
Therefore, position data is output every moment based on the scanning position of the viewpoint of the radiant energy detector 13. Then, the microcomputer 1 is based on both of these data.
8, the radiant energy intensity distribution along the scanning line of the radiant energy detector 13 is sequentially obtained, and from this radiant energy intensity distribution, the edge position P1,
P2 is detected. Then, the two-dimensional shape and surface temperature distribution of the char bed 11 are obtained based on the detected edge positions P1 and P2, and displayed on the two-dimensional display 24.

As described above, according to the present embodiment, the shape or surface temperature distribution of the char bed 11 is automatically and accurately displayed on the two-dimensional display 24. Therefore, it is not necessary to monitor the charbed shape with the naked eye through the peep window of the recovery boiler 10 as in the conventional case. For example, if the two-dimensional display 24 is installed in an investigation room or the like, the operator can use the two-dimensional display 24. By monitoring, the shape of the char bed 11 can be grasped easily and quickly. As a result, char bed 1
When the shape of 1 becomes unsuitable, the recovery device can be quickly implemented.

That is, when the height of the char bed 11 becomes too high, the temperature of the black liquor is raised to reduce the particle size of the black liquor injected from the black liquor injection mechanism, or for combustion into the recovery boiler 10. The height of the char bed 11 is lowered by increasing the amount of air input. On the contrary, char bed 11
If the height of the black liquor is too low, lower the black liquor temperature to increase the particle size of the black liquor injected from the black liquor injection mechanism, or decrease the amount of combustion air input into the recovery boiler 10. This increases the height of the char bed 11. Further, when the position of the char bed 11 is too close to one of the furnace walls, the injection position of the black liquor injection mechanism is adjusted to reduce the amount of black liquor falling to the approach side, or the furnace wall on the approach side. The position of the char bed 11 is returned to an appropriate position by increasing the flow rate of the combustion air injected from the.

Since such a recovery procedure can be carried out promptly, the char bed is capable of stable operation with high boiler thermal efficiency and high chemical raw material recovery rate while suppressing the emission of pollutants and dust generation. It is possible to always maintain the shape of 11.

Further, the surface temperature distribution of the char bed 11 is displayed on the two-dimensional display 24 with high accuracy. Therefore, by monitoring the surface temperature distribution, it becomes possible to detect combustion failure of the char bed 11 promptly and highly accurately,
It is possible to constantly manage the combustion state in the furnace to an appropriate state.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the operator monitors the shape of the char bed 11 displayed on the two-dimensional display 24, and manually adjusts the black liquor temperature, the black liquor injection mechanism, the combustion air flow rate, etc., if necessary. Although the case is shown, the output to the two-dimensional display 24 is given to the black liquor temperature, the black liquor injection mechanism or the mechanism for automatically adjusting the flow rate of combustion air, etc. The injection mechanism or the flow rate of combustion air may be automatically adjusted. By doing so, the shape or position of the char bed can be controlled more precisely and automatically without human intervention, and the optimum combustion state can be maintained. In addition, a plurality of this apparatus may be installed around the recovery boiler 10 and a mechanism for synthesizing information obtained from these may be provided to three-dimensionally grasp the shape of the char bed 11.

Further, in the above-described embodiment, the case where only one radiant energy detector 13 is provided on the side wall surface of the boiler is shown, but a plurality of radiant energy detectors are arranged in the scanning direction and the output is sequentially switched to scan as if by scanning. Even if it does, the same effect can be obtained. When only the viewpoint of the radiant energy detector 13 is scanned in a fan shape, the viewpoint of the radiant energy detector 13 is not actually moved, but the viewpoint of the radiant energy detector 13 and the recovery boiler 10 side. The radiant energy intensity may be detected by interposing a prism or the like between the wall and the wall and moving the prism or the like. When only the viewpoint of the radiant energy detector 13 is scanned in a fan shape, a plurality of radiant energy detectors may be provided in parallel and the radiant energy intensity may be detected from these. By doing so, the radiant energy intensity can be detected with higher accuracy. In addition, one radiant energy detector 13
When the viewpoint is scanned in a fan shape, the distance from the viewpoint to the subject changes if the field of view is too wide. Therefore, it is necessary to add a correction coefficient depending on the distance to the output of the detector 13 for correction. . In this case, the correction becomes easier if the scanning direction of the radiant energy detector 13 is vertical as shown in FIG. 3 (b).

Further, in the above embodiment, the case where the radiant energy detector 13 scans in two directions, that is, the horizontal direction and the vertical direction, has been described. However, it is also possible to perform zigzag planar scanning in the oblique direction. Further, in the above embodiment, the edge position detecting means 3
3 shows the case where the slice level L is provided at the position of 90% of the peak temperature and the position that gives the temperature corresponding to this slice level L is set as the edge position, but the position where the change rate is large by differentiating the radiant energy intensity distribution. May be at the edge position, or in the case of plane scanning in the vertical direction, the same effect can be obtained even if the peak temperature position is set as the edge position. Of course, various modifications can be made without departing from the scope of the present invention.

〔The invention's effect〕

As described above in detail, according to the present invention, the radiation thermometer having a sensitivity in the wavelength band that is hardly affected by the radiation of the gas inside the recovery boiler is provided on the furnace wall, and the field of view of the radiation thermometer is determined by the scanning mechanism. The two-dimensional shape of the char bed or the temperature distribution of the char bed surface is acquired as the two-dimensional information of the char bed based on the radiation energy intensity distribution output from the radiation thermometer.

Therefore, according to the present invention, the two-dimensional shape diagram or the surface temperature distribution diagram of the char bed is automatically displayed at all times, so the char bed can be constantly monitored automatically and with high accuracy, and the operation of the recovery boiler is stable. It is possible to provide a char bed two-dimensional information processing apparatus for a recovery boiler, which can achieve higher efficiency and higher efficiency, can promptly deal with a char bed even if it occurs, and does not hinder plant operation.

[Brief description of drawings]

1 to 5 are views showing an embodiment of the present invention,
Figure 1 is a system diagram showing the configuration, and Figure 2 is the measurement wavelength (horizontal axis).
And the radiant energy intensity (vertical axis).
(A) and (b) are diagrams showing the scanning direction of the radiant energy detector, FIG. 4 is a block diagram showing the functional configuration of the microcomputer, and FIG. 5 is a radiant energy intensity distribution with respect to the scanning position of the radiant energy detector. It is a figure which shows an example. 10 ... Recovery boiler, 11 ... Char bed, 12 ... Radiation thermometer, 13 ... Radiation energy detector, 14 ... Temperature signal transmitter, 15 ... Scanning mechanism, 16 ... Position signal transmitter, 18 ... … Microcomputer, 20 …… CP
U, 21 ... ROM, 22 ... RAM, 24 ... Two-dimensional display, 31 ... Data input means, 32 ... Data processing means, 33 ... Edge position detecting means, 35 ... Edge temperature distribution detection means.

Front page continued (72) Inventor Yohei Shiogoshi, 1-1, Jojo-cho, Yatsushiro-shi, Kumamoto Inside the Yatsushiro Mill, Tojo Paper Co., Ltd. (72) Takao Matsuda 4-35, Shimaya, Konohana-ku, Osaka Heavy Industry Co., Ltd. Osaka Plant (72) Inventor Yasumitsu Kurosaki 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industry Co., Ltd. Akashi Plant (72) Inventor Toshiyuki Ibed 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries (72) Inventor Shiro Nakabayashi 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Ltd. Akashi Factory (72) Inventor Kazuyuki Iizuka 1-1-1, Shibaura, Minato-ku, Tokyo In the Toshiba headquarters office (72) Inventor Ryuichi Kuwata 1 in Toshiba Fuchu, Tokyo Fuchu-shi, Tokyo (72) Inventor Ao Kumaki 1 in Toshiba Fuchu, Tokyo, Fuchu-shi, Ltd. (72) Inventor Takahisa Chika, 1st Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory (56) Reference JP-A-62-29828 (JP, A) JP-A-62-29829 (JP, A) JP-A-61-49903 (JP, A) Actual development Sho-60-148851 (JP, U)

Claims (5)

[Claims] 1. A recovery boiler for combusting black liquor discharged from a chip digesting step to generate steam and recovering a raw material for chemicals for chip digestion, in a boiler gas body provided in a furnace wall of the recovery boiler. A radiation thermometer that is sensitive to the wavelength band that is not easily affected by radiation, a scanning mechanism that scans the field of view of this radiation thermometer in a predetermined direction, and the radiation energy intensity output from the radiation thermometer that is scanned by this scanning mechanism. A two-dimensional information processing device for a recovery boiler, comprising: a two-dimensional information processing means for acquiring and processing the two-dimensional information of the charbed based on a distribution. 2. The two-dimensional information processing means detects an end point of the char bed based on a radiant energy intensity distribution output from the radiation thermometer, and based on the end point, two-dimensional information of the char bed is obtained. The char bed 2 of the recovery boiler according to claim (1), wherein the char bed 2 is acquired as shape information of the char bed.
Dimensional information processing device. 3. The two-dimensional information processing means acquires and processes two-dimensional information of the char bed as a surface temperature distribution of the char bed, according to claim (1). Char bed 2D information processing device for recovery boiler. 4. The two-dimensional information processing means detects an end point of the char bed based on a radiant energy intensity distribution output from the radiation thermometer, and based on the end point, two-dimensional information of the char bed is obtained. The char bed two-dimensional information processing apparatus of the recovery boiler according to claim (1), wherein the char bed two-dimensional information processing apparatus acquires the surface temperature distribution of the char bed. 5. The radiation thermometer has a wavelength band of 3.8 μm which is not easily affected by radiation of the gas inside the boiler.
A char bed two-dimensional information processing apparatus for a recovery boiler according to claim (1), characterized in that a wavelength band in the vicinity is used.