Flame detector is an important device in the boiler furnace safety monitoring system, the role of the device is to detect the combustion conditions in real time according to the combustion characteristics of the flame, once the flame combustion state does not meet the normal conditions or flame out and other abnormal conditions, according to a certain way to give a signal to ensure that the boiler stop fuel supply, to ensure the safe operation of the whole set of thermal equipment.
Flame detector development to now, its detection mainly includes flame information of light energy, heat energy, image, there are differences only in the principle of detection. Based on practical experience, EBICO technical engineers divide the burner flame detectors on the market into the following categories according to the principle, and put forward their respective shortcomings that need to be improved.
1.Smoke sensor, which is a flame indirect detector, when the flame is produced after the smoke is also produced. When the smoke reaches a certain concentration an alarm signal is issued. With this way to detect the flame has a major drawback, there are many substances burning without smoke (such as natural gas, ethanol, methanol, etc.), and the detection distance is short, the sensor must be at the location of the thickest smoke, visible when the flame occurs to the smoke is dense, and then the alarm, in some occasions may be too late.
2.Heat release infrared flame detector, direct detection of the flame wavelength of 4.35 ± 0.15μm infrared spectrum, the detection target is relatively clear, it consists of heat release probe and amplifier, the shortcomings are: this type of sensor has a piezoelectric, sound electromagnetic waves and vibration are very sensitive, so the use of the place is somewhat limited, its detection distance is less than 80m.
3.Conventional UV flame detector, direct detection of the flame in the UV spectrum of 180-260nm, the detection of the target is also very clear, the response rate is also relatively fast. It consists of ultraviolet photosensitive probe and amplifier, the shortcomings are: poor sensitivity, detection distance of less than 15m, can not resist the interference of lightning, there is a certain rate of false alarms, so it can only be used in a short distance of the closed environment, such as heating furnace, industrial boilers and other places.
More burner flame detector tips, welcome to pay attention to the EBICO official website https://www.ebico.com/.
Based on decades of project experience of EBICO engineers, we offer a unique insight into the operating principle of burner flame detectors....
