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A multi-color temperature measuring device and method for two-dimensional flame temperature field

A two-dimensional field and measurement method technology, applied in the field of pulverized coal combustion temperature measurement research, can solve problems such as experimental errors, difficulty in ensuring single particles, and inability to accurately judge, so as to improve work efficiency, reduce operation difficulty, and increase the measurement area. Effect

Active Publication Date: 2021-01-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] 1. This method is only applicable to the measurement of the combustion temperature of single particle pulverized coal, and can only obtain the variation of the combustion temperature of a single particle with time, and cannot obtain the distribution gradient of the field temperature
[0011] 2. This method calculates the temperature by measuring the light intensity of coal powder combustion spontaneous radiation entering the lens system, but it is difficult to guarantee single particles in actual experimental conditions. If it is not a single particle, the combustion of coal powder particles other than the target particle will also produce The light intensity enters the lens system, which brings experimental errors and affects the accuracy of experimental results
In the actual experiment process, it is possible that the first half of the tracking is a pulverized coal particle, and it burns out at a certain position in the middle, and the second half of the tracking is other particles. It cannot be accurately judged that it is the tracking process of a certain target particle from ignition to burnout.
[0012] 3. This method can only measure the one-dimensional temperature field of pulverized coal particles along the central axis of the burner, and cannot obtain the temperature field distribution of the two-dimensional plane temperature field flame

Method used

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  • A multi-color temperature measuring device and method for two-dimensional flame temperature field
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  • A multi-color temperature measuring device and method for two-dimensional flame temperature field

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specific Embodiment approach 1

[0045] Embodiment 1: This embodiment provides a device for measuring the two-dimensional field distribution of pulverized coal combustion temperature, such as figure 1 As shown, the device is composed of a narrow-band interference filter 1, a four-channel high-speed camera 2 and a computer 4, wherein:

[0046] The number of the narrow-band interference filter 1 is four, its bandwidth is 10nm, and its center wavelength is 650nm, 800nm, 800nm, 975nm respectively;

[0047]The inside of described four-channel high-speed camera 2 contains four high-speed cameras, and the lens fronts of the four high-speed cameras have a mirror frame at the same distance for installing narrow-band interference filter 1, the center of narrow-band interference filter 1 and the high-speed The centers of the cameras are coaxial and at the same level, and the light paths from the flame to the four high-speed cameras are the same, ensuring simultaneous shooting;

[0048] The computer 4 is used to process...

specific Embodiment approach 2

[0069] Embodiment 2: This embodiment provides a method for measuring the two-dimensional field distribution of pulverized coal combustion temperature by using the device described in Embodiment 1, which is realized by the following steps:

[0070] Step 1. Adjust the focal length of the camera so that the focal plane is positioned on the central plane passing through the central axis of the burner.

[0071] Step 2: Use a four-channel high-speed camera to shoot the pulverized coal combustion flame, and obtain four pictures corresponding to the central wavelengths of 650nm, 800nm, 800nm, and 975nm.

[0072] Step 3, according to the obtained pictures under different wavelengths figure 2 The segmentation method (the image resolution is 1280×1024, select a pixel value n with the same interval between two rows and two columns, and divide the image into 1024 / n rows, 1280 / n columns) into i rows and j columns (i and j is an integer, for example: i=256, j=320), get i×j small cells, eac...

specific Embodiment approach 3

[0076] Embodiment 3: This embodiment is different from Embodiment 2 in that it needs to continuously track and photograph the combustion flame of a single particle.

[0077] In this embodiment, the high-speed camera uses a frequency up to 10 kHz to shoot the combustion image of a single particle of pulverized coal, and is used to track the temperature change of the single particle from ignition to burnout.

[0078] The method for measuring the combustion temperature of a pulverized coal particle by means of the device described in Embodiment 1 is realized by the following steps:

[0079] Step 1. Adjust the focal length of the camera so that the focal plane is positioned on the central plane passing through the central axis of the burner.

[0080] Step 2. Adjust the powder feeding amount, try to ensure that the powder feeding is close to a single particle, and ensure that the pulverized coal particles do not agglomerate.

[0081] Step 3. Use a four-channel high-speed camera to...

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Abstract

The invention discloses a multi-color temperature measuring device and method for two-dimensional flame temperature field. The device includes four narrow-band interference filters, a four-channel high-speed camera with four high-speed cameras inside, and a computer. The four The lens front end of the high-speed camera is installed successively with a bandwidth of 10nm and a narrow-band interference filter with a central wavelength of 650nm, 800nm, 800nm, and 975nm; The image uses MATLAB image processing technology for data processing and temperature calculation by ratio algorithm. The invention adopts a non-contact active measurement combustion diagnosis method, which can accurately measure the combustion temperature of the pulverized coal flame, can measure the two-dimensional plane temperature field and the field temperature distribution gradient of the pulverized coal combustion flame, and can track and capture single particle pulverized coal Combustion temperature as a function of time from ignition to burnout.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal combustion temperature measurement research, and relates to a two-dimensional temperature field multi-color temperature measurement device and method, in particular to a four-channel high-speed camera measurement device and method for pulverized coal flame combustion temperature. Background technique [0002] Since the beginning of the industrial revolution, coal has been the main energy source in the world for hundreds of years. Even after oil replaced coal as the main energy source in the world, coal is still one of the most important basic energy sources in the world. The measurement of the combustion temperature of pulverized coal is crucial to realize the clean and efficient utilization of coal. By measuring the combustion temperature of pulverized coal, the ignition mode of pulverized coal and the characteristics of ignition and burnout of pulverized coal combustion can be studied. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K13/00G01N15/00
CPCG01K13/00G01N15/00
Inventor 彭江波齐洪亮于杨孙锐李晓晖马欲飞常光曹振高龙严彪罗邺曲天娇
Owner HARBIN INST OF TECH