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Flame detecting method and apparatus for single burner

A flame detection device and flame detection technology, which are used in the control of combustion, electrical radiation detectors, lighting and heating equipment, etc., can solve the problems of immature flame images and cannot meet the actual needs of single-burner flame detection, etc. The effect of low manufacturing cost, high reliability and stable technical performance

Inactive Publication Date: 2006-07-19
吉林市龙华电力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can not meet the actual needs of single burner flame detection
In recent years, some people in China have used cameras to record flame images, and then use computer image processing to detect single burner flames. Since computer image processing technology is not yet very mature in processing flame images, this method is still far from practical application.

Method used

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  • Flame detecting method and apparatus for single burner
  • Flame detecting method and apparatus for single burner
  • Flame detecting method and apparatus for single burner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Signal handlers such as image 3 As shown, the furnace flame 4 ~ 20mA signal is converted into a voltage signal by R1. On the one hand, it is amplified by the operational amplifier U1 and then sent to the A / D input terminal AD0 of the microprocessor; After U2 is amplified, it is connected to the A / D input terminal AD1 of the microprocessor. The microprocessor MCU calculates according to the A / D results of AC and DC, and obtains the characteristic spectrum of the single burner flame, and judges the presence or absence of the single burner flame. The microprocessor has three output modes; ① Drive the digital tube through U4 to display the running and fault signals. ② Drive the relay through the transistor N1 to output the switching signal. ③ After the calculated flame signal digital quantity is converted into an analog quantity by D / A, it is converted into a 4-20mA current signal output through the operational amplifier U5 and the current converter Z2.

[0035] The P2 ...

Embodiment 2

[0037] Signal handlers such as Figure 4 As shown, the furnace flame 4 ~ 20mA signal is converted into a voltage signal by R1. On the one hand, it is amplified by the operational amplifier U1 and then sent to the A / D input terminal AD0 of the microprocessor; U2 amplifies, and then sends the two frequency band signals to the A / D input terminals AD1 and AD2 of the microprocessor after passing through the programmable band-pass filter U3. The microprocessor MCU performs calculations based on the A / D results of AC and DC to judge whether there is a single burner flame. The microprocessor has three output methods: ① Drive the digital tube through U4 to display the operation and fault information. ② Drive the relay through the transistor N1 to output the switching signal. ③ After the digital quantity of the flame signal is converted into an analog quantity by D / A, it is converted into a 4-20mA current signal output through the operational amplifier U5 and the current converter Z2....

Embodiment 3

[0040] Signal handlers such as Figure 5 As shown, the furnace flame 4 ~ 20mA signal is converted into a voltage signal by R1. On the one hand, it is amplified by the operational amplifier U1 and then connected to the input terminal IN of the A / D converter U3; After amplification, it is connected to the input terminal IN of A / D converter U4. The conversion results of A / D converters U3 and U4 are output to the digital signal processor DSP. DSP calculates according to the A / D results of AC and DC, and obtains the characteristic spectrum of the single burner flame, and judges whether there is a single burner flame. The digital signal processor has three output methods; ① Drive the digital tube through MAX7219 to display the operation and fault signals. ② Drive the relay through the transistor N1 to output the switching signal. ③ After the calculated flame signal digital quantity is converted by U5, it becomes a 4-20mA current signal output.

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Abstract

The present invention discloses single combustor flame detecting method and device, and aims at adopting characteristic spectrum analysis method to capture the characteristic spectrum of the electric signal, which is obtained with single combustor flame in the burning area and through optoelectric conversion. The single combustor flame is separated from the background flame to eliminate the effect of the background flame so as to detect the combustion status of the target combustor flame. The detecting device consists of flame probe comprising lens combination and optoelectric converter, and signal processing unit with MCU as main part. It has spectrum range of 0-1000 Hz, and output current of 4-20 mA analog amount and digital amount, and may be combined with DCS, FSSS, etc. to constitute loop. The present invention may be used widely in automatic hearth protecting system of gas, oil and coal burning boiler in large thermal power plant.

Description

technical field [0001] The present invention relates to a method and device for boiler furnace safety detection, more specifically, to a method and device for detecting the flame of a single burner. Background technique [0002] Large-scale boilers must have complete monitoring and control methods to prevent furnace explosions. This function is completed by the "Boiler Furnace Safety Monitoring System" (FSSS), and the boiler burner flame detection is an important part of the system. Its correctness Detection or not will directly affect the reliability of the entire boiler furnace safety monitoring system. So far, most of the domestically produced photovoltaic flame detectors are simple photovoltaic flame detectors. Although they are also installed next to the burner, they cannot separate the flame of the target burner from the background (full furnace) flame. Flame detection, they don't really meet FSSS system needs. Boilers with an evaporation ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N5/08G01J5/10
Inventor 宋轩邱立科崔松海
Owner 吉林市龙华电力技术有限公司