CN217278938U - A real-time detection system for slag drop based on area array lidar - Google Patents

Abstract

The utility model discloses a real-time detection system for slag falling based on area array laser radar. The system comprises: area array laser radar, the area array laser radar is facing the falling channel of falling slag in the furnace, and is used for passing coal powder The observation hole of the furnace records the falling trajectory video of the slag in the furnace; the data cable is used to connect the area array laser radar and the data terminal, so as to transmit the video obtained by the area array laser radar to the data terminal; It receives the video information obtained by the area array laser radar transmitted by the data line, and guides the pulverized coal furnace to optimize the operation state according to the frequency and size of the falling slag through the real-time detection subsystem of the falling slag. The system can monitor the situation of slag falling in the pulverized coal furnace in real time, provide a strong basis for combustion and control in the pulverized coal furnace, reduce the potential safety hazards of large slag falling to the equipment, and improve the performance of the pulverized coal furnace. Safe and reliable and realize the clean and efficient utilization of domestic pulverized coal furnace power plants.

Description

A real-time detection system for slag drop based on area array lidar

technical field

The utility model relates to the technical field of pulverized coal furnace incineration, in particular to a real-time detection system for slag falling based on area array laser radar.

Background technique

The pulverized coal furnace is a boiler equipment that uses pulverized coal as fuel. It has the advantages of rapid and complete combustion, large capacity, high efficiency, adaptability to a wide range of coal types, and easy control and adjustment. The combustion characteristic of the pulverized coal furnace is that the fuel enters the combustion chamber with the air and burns in a suspended state.

Slag formation on the water wall and on the screen of the pulverized coal boiler furnace is a common phenomenon. At the same time, the slagging in the furnace will reduce the heat transfer capacity of the heating surface, resulting in an increase in the flue gas temperature at the furnace outlet and a decrease in boiler efficiency. When the slagging is serious, the falling of large pieces of slag may smash the water wall at the bottom of the furnace or block the slag discharge port, causing the boiler to extinguish the fire and stop the furnace, or even cause a safety accident.

After slagging in the pulverized coal furnace, slag falling will have a serious impact on the equipment. Obtaining accurate slag block size and slag falling position is of great significance to control combustion in the furnace and reduce potential safety hazards. Domestic detection systems for slagging and slagging usually use the heat flow meter installed on the water wall to monitor and diagnose the heat flow change caused by the slagging, or use infrared imagers installed at different positions to measure the radiation emissivity of the surface of the water wall. It directly reflects the slagging condition of the wall, but such a system has defects such as large errors, harsh application conditions, and many restrictive conditions. The existing system can only obtain the trend of slagging in the furnace, but cannot obtain key information such as the position and size of real-time slagging, and field operators often judge the position and size of slag only based on operating experience. A system that can effectively detect the position and size of slag in real time.

Utility model content

The purpose of the utility model is to provide a real-time detection system for slag falling based on area array laser radar, which solves the problems in the prior art that common industrial cameras cannot capture images of falling slag and that falling slag from pulverized coal furnace cannot be detected in real time.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A real-time detection system for slag slag based on area array lidar, comprising:

Area array laser radar, the area array laser radar is facing the falling channel of the slag falling in the furnace, and is used to record the falling track video of the falling slag in the furnace through the observation hole of the pulverized coal furnace;

The data cable is used to connect the area array lidar and the data terminal, so as to transmit the video obtained by the area array lidar to the data terminal;

The data terminal is used to receive the video information obtained by the area array lidar transmitted by the data line, and guide the pulverized coal furnace to optimize the operation state according to the frequency and size of the falling slag through the real-time detection subsystem of the falling slag.

In the above technical solution, further, the described slag falling real-time detection subsystem includes: an image acquisition module, a grayscale processing module, a binarization processing module, a slag falling frequency calculation module, a connected domain size calculation module, and an alarm module;

The image acquisition module is used for extracting one frame of slag falling image per second from the falling track video of the slag falling; The binarization processing module is connected with the grayscale processing module, and is used to perform the binarization processing on the grayscale image to obtain a binarized image; the slag falling frequency calculation module is connected with the binarization The processing module is connected, and is used to count the number of connected domains in the binarized image, so as to obtain the number of slag falling in the image and calculate the frequency of falling slag; the connected domain size calculation module and the binarization processing module connected, used to calculate the size of each connected domain in the binarized image; the alarm module is connected with the connected domain size calculation module and the slag falling frequency calculation module, and is used to send out when the connected domain size and the slag falling frequency exceed the safety threshold. safety instructions.

Further, by setting an observation window on the pulverized coal furnace, the area array laser radar is used to collect the video of the falling slag falling channel, and the image acquisition module extracts the slag falling image from the video. Since there are a large number of unburned flames where the slag of the pulverized coal furnace falls, ordinary industrial cameras cannot capture the image of the falling slag, so the area array lidar is used to capture the falling trajectory of the falling slag through the flame.

Further, in the binarized image processed by the binarization processing module, the color difference between the slag falling and the shooting background causes the binarization image to present multiple connected domains representing the falling slag. The threshold set when the binarization processing module changes the image from a grayscale image to a binarized image is 80.

Further, in the slag falling frequency calculation module, the number of connected domains of a certain frame of image is counted as N, the slag falling frequency η=N/1, and its unit is HZ.

Further, the connected domain size calculation module is used to calculate the size of the connected domain. The size of the connected domain S _n is obtained by counting the sum of the pixels in a certain connected domain, where n=1, 2, 3...k.

Further, the threshold value of the safe connectivity domain of the size of the slag is S _sa , and when _Sn > S _sa , the alarm module issues a slag falling danger instruction. The safety threshold of the slag falling frequency is 1/40. When the slag falling frequency exceeds the safety threshold, the alarm module will also issue a slag falling danger command.

The slag falling real-time detection system based on the area array laser radar provided by the utility model can detect the size and frequency of falling slag in the pulverized coal furnace in real time through the area array laser radar, optimize the combustion control of the pulverized coal furnace in real time and reduce the Therefore, the efficiency and safety of pulverized coal furnace combustion can be improved.

Compared with the prior art, the benefits of the present utility model are:

The slag falling real-time detection system based on the area array laser radar of the utility model obtains the size and quantity of the slag falling connected area of each frame image in real time, and finally obtains the size and falling frequency of the slag falling from the pulverized coal furnace. Because there are a lot of flames where the slag falls from the pulverized coal furnace, ordinary industrial cameras cannot capture the image of the slag, and the area array lidar can be used to penetrate the flame to capture the falling trajectory of the slag. The real-time detection system of slag falling based on area array lidar is more real-time and accurate than the on-site operators based on the monitoring screen in the furnace. It can efficiently and accurately calculate the frequency of falling slag and issue the danger of large falling slag. Reminder, it can realize the monitoring of the stable combustion of the pulverized coal furnace, making the combustion of the pulverized coal furnace more efficient, clean, safe and reliable.

Description of drawings

1 is a schematic diagram of an area array laser radar installed on a pulverized coal furnace in an embodiment of the present utility model;

FIG. 2 is a detection flow chart of a real-time detection system for slag falling based on an area array laser radar in an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described below with reference to the embodiments and the accompanying drawings. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example

Referring to FIG. 1 , the pulverized coal furnace in this embodiment includes: a furnace 1 of the pulverized coal furnace, an industrial computer 7 , a data line 6 , an area array laser radar 5 , a slag dropping channel 2 and a slag hopper 3 . The falling slag in the hearth 1 of the pulverized coal furnace falls into the slag hopper 3 through the falling slag passage 2 , and the area array laser radar 5 is installed in the middle of the falling slag passage 2 . The slag falling video is captured by the area array lidar 5, and the collected video is input to the industrial computer 7 containing the slag falling real-time detection subsystem through the data line 6 to obtain the final slag falling frequency and slag size. The falling dross 4 is finally accumulated in the slag hopper 3 through the dross channel 2 .

Referring to Figure 2, when the slag falling real-time detection subsystem is called, the following steps are performed:

Step S100 : acquiring one frame of slag falling images captured by the area array solid-state lidar sensor per second.

Step S200: Convert the corresponding BGR three-channel flame image into a single-channel grayscale image.

Step S300 : the grayscale image obtained in step S200 is binarized to obtain a binarized image with only pixel values of 0 and 255.

Step S400: Count the sum N of connected domains of the binarized image for the image obtained in step S300, obtain the number of slag falling in the figure, and calculate the slag falling frequency η=N/1(HZ).

Step S500: Count the sum S _n of the pixels in a certain connected domain to obtain the size of each connected domain, where n=1, 2, 3...k.

Step S600 : the threshold value of the safety connectivity domain for detecting the size of the falling slag is S _sa , and when _Sn > S _sa , the system issues a slag falling danger instruction. The safety threshold for detecting the slag falling frequency is 1/40. When the slag falling frequency η>1/40, the system will also issue a slag falling danger command.

To sum up, in this embodiment, the area array laser radar is used to obtain the image information of the slag falling from the pulverized coal furnace, and based on a real-time slag falling picture obtained every 1s, a series of image processing methods such as connected domain size and number statistics are used. , and finally, the size and falling frequency of the slag in the pulverized coal furnace can be obtained, and the danger warning when the large falling slag falls can be obtained. Finally, the utility model solves the problem that the size and frequency of slag falling in the pulverized coal furnace cannot be obtained in real time in the power plant of the pulverized coal furnace, and can monitor the situation of the slag falling in the pulverized coal furnace in real time, which provides a better comparison for the combustion and control in the pulverized coal furnace. The strong basis reduces the potential safety hazard caused by large slag falling to the equipment, thereby improving the safety and reliability of the pulverized coal furnace and realizing the clean and efficient utilization of the domestic pulverized coal furnace power plant. Compared with manual experience, this system is used to estimate the cycle magnification, which has the advantages of high efficiency, fastness, accuracy, and real-time update, and can realize real-time monitoring of slag falling from the pulverized coal furnace.

Claims (5)

1. The utility model provides a sediment real-time detection system that falls based on area array laser radar which characterized in that includes:

the area array laser radar is over against a falling channel of the falling slag in the furnace and is used for recording a falling track video of the falling slag in the furnace through an observation hole of the pulverized coal furnace;

the data line is used for connecting the area array laser radar and the data terminal so as to transmit the video acquired by the area array laser radar to the data terminal;

the data terminal is used for receiving video information acquired by the area array laser radar transmitted by the data line and guiding the pulverized coal furnace to optimize the running state according to the falling frequency and the falling size of the falling slag through the falling slag real-time detection subsystem;

the falling slag real-time detection subsystem comprises: the device comprises an image acquisition module, a gray level processing module, a binarization processing module, a slag falling frequency calculation module, a connected domain size calculation module and an alarm module;

the image acquisition module is used for extracting one frame of slag falling image from the video every second; the gray processing module is connected with the image acquisition module; the binarization processing module is connected with the gray level processing module; the slag falling frequency calculation module is connected with the binarization processing module; the connected domain size calculation module is connected with the binarization processing module; and the alarm module is connected with the connected domain size calculation module and the slag falling frequency calculation module.

2. The area array laser radar-based real-time slag falling detection system according to claim 1, wherein in the binarization processing module, a threshold value of binarization processing is set to be 80.

3. The area array laser radar-based real-time slag detection system according to claim 1, wherein a connected domain represents slag in the binarized image output by the binarizing processing module.

4. The system according to claim 1, wherein the slag frequency calculation module is configured to calculate a slag frequency η = N/1, which is expressed in HZ, where N is the number of connected domains of a certain frame of image, and the safety threshold of the slag frequency is 1/40.

5. The system according to claim 1, wherein the size of the connected component is calculated by the module, and the size of the connected component is calculated by the module _n The sum of the pixel points in one connected domain is shown, wherein n =1,2,3 … k, and k is the number of the connected domains.

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