Flame detection device

Flame detection devices are key equipment for flame detection during boiler and burner operation. The flame detection device detects the combustion condition based on the physical characteristics of the flame. When the flame combustion status does not meet normal conditions or stalls, it can provide signals (switching values, analog values) in a certain manner as a logical judgment condition for a fault alarm or furnace safety monitoring system (FSSS).

The XHT series flame detection devices produced by Xuzhou Jieneng Electric Power Equipment Co., Ltd. are classified into ultraviolet, visible, and image types according to different usage situations and spectral characteristics. Each type of flame detection consists of a probe, detection cable, and signal processor.

XHT-3 Ultraviolet Flame Detection Device

1. Overview

XHT-3 Ultraviolet Flame Detection Device is a new type of intelligent flame detection device designed and manufactured according to gas safety regulations. It consists of a flame detection probe and a processor, which are connected by two core twisted pair shielded cables.

2. Working principle

The light signal emitted by the flame is transmitted to a photosensitive tube at the tail of the probe, which completes photoelectric conversion. The signal transmission between the flame detection probe and the processor adopts a current transmission method, improving the anti-interference ability, and is transmitted to the processor through a shielded cable. After the electrical signal is processed by the processor, it outputs a fire or no fire signal in the form of a switching value.

3. Technical characteristics

(1) The output signal of the flame detection processor provides fire and no fire switching value output signals. The threshold value and extension time of this switching value signal can be adjusted through the panel. The flame detection device also has a fault self-diagnosis function. The self-test alarm unit detects the timing of the amplifier, and the power overload protection circuit monitors the power supply to the probe, which can detect the cause of the fault. When a fault occurs, the amplifier panel should be able to display an alarm and distinguish the type of fault. After the fault is eliminated, press the reset button, and the device will return to its normal working state.

(2) The flame processor is equipped with sensitivity adjustment and background level adjustment circuits for operators to adjust to eliminate interference signals.

(3) The signals provided by the flame detection device can meet the needs of the design of gas burner and boiler protection logic. Ensure that the flame detection protection during the operation of the boiler is put into operation throughout the entire process. The flame detection signal directly uses the switching value signal output from the flame detection amplifier, without any other condition correction.

 

XHT-5 可见光火焰检测装置

     

1. Overview

XHT-5 type visible light flame detection device is a new generation flame detection device of our company, which is suitable for detecting the combustion of fuel oil, coal, and other fuels, displaying the flame intensity and pulse frequency inside the furnace, and realizing fault self-test, indication, and signal output. It consists of a flame detection probe and a signal processor. It uses digital processing technology and new pattern recognition software and hardware to quantify the target flame, improving the accuracy of detection. It is widely used for flame detection of various fuels and coal in power stations, petrochemical, metallurgical, and other fields.

2. Working principle

The target flame is focused by the lens group and transmitted to the preprocessing circuit board through optical fibers. After converting the visible light signal into electrical signals, the intensity and pulse frequency of the flame are digitally processed, and finally transmitted to the processor. The CPU in the processor collects the signals transmitted from the probe, processes and calculates them, and displays the intensity and pulse frequency of the flame on the digital tube. At the same time, the intensity of the flame is displayed in the form of a light column, and automatically identifies it according to the preset fire and no fire identification standards. Finally, the corresponding signals and instructions are given.

3. Technical characteristics

(1) In addition to the 4-20mA signal of flame intensity, the output signal of the flame detection processor also provides fire and no fire switching value output signals. The threshold value and extension time of this switching value signal can be adjusted through the panel. The flame detection device also has a fault self-diagnosis function. The self-test alarm unit regularly detects the amplifier. The power overload protection circuit monitors the power supply to the probe at any time, and can detect the cause of the fault. When a fault occurs, the amplifier panel should be able to display an alarm and distinguish the type of fault. After the fault is eliminated, press the reset button, and the device will return to its normal working state.

(2) The flame detection device is designed with a sensitivity adjustment and background level adjustment circuit for operators to adjust to eliminate interference signals.

(3) The signals provided by the flame detection device are sufficient to meet the needs of the design of coal, oil burners, and boiler safety logic. Ensure that the flame detection protection during the operation of the boiler is put into operation throughout the entire process. The flame detection signal directly uses the switching value signal output from the flame detection amplifier, without any other condition correction.