Usage of boiler flame detection system
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Please share your experiences with boiler flame detection systems – which ones perform best, what is the accuracy of their fire suppression functions, and how should the detectors be maintained to ensure accurate detection of fires in the furnace, thereby preventing explosions caused by furnace fires?
We have been using UE tubes (which receive optoelectronic signals), as well as electroion probe rods; however, we use small furnaces in all cases. Low power. Last edited by XJTZWKDPJ on 2008-1-3 20:15]
The flame monitor used for grilling in our unit is designed to detect infrared and ultraviolet rays, but it’s said to not be very accurate, so it’s not really used in practice!
Is the flame detector removed from the furnace after ignition, and is it only used during ignition and extinguishing?
No, I think the poster is referring to a flame monitoring system that can issue alarms and trigger interlock actions when the furnace goes out, in order to ensure the safe operation of the boiler.
It adds two functions – fire detection and leak detection – to prevent fires and explosions in the furnace. We have used U/V (infrared/ultraviolet) models, which are of American origin. There are also mechanical types that can directly cut off the fuel gas; they have a certain delay in response, and they are also of American origin.
I don’t think what the original poster is saying is correct. The flame monitoring system you mentioned is used in ordinary cement plants to monitor the flames in large kilns, as well as for monitoring flares.
However, the torch detectors produced domestically are of poor quality; two of those in our unit do not work.
Among the flame detection devices in use in China today, those imported generally have much better detection performance and stability than domestic ones. Importers include: FORNEY, ABB, COEN, DURAG, etc. The installation location and the ratio of cold air determine the amount of routine maintenance required; it is not recommended to change the adjustment parameters of the equipment itself frequently. If the fire detector you are using gives false alarms, you should check whether the installation location of the detector and its adjustment parameters are appropriate; for example, remove the probe to see if its installation angle includes the burning flame ； Is the signal amplification ratio of the probe too high? (This can be checked by seeing whether the analog output is always at its maximum level.) If the amplification ratio is too high, the fire protection device for the boiler furnace will not activate ； Is the method for determining the flame signal output simple? If the flame detection adjustment mechanism only provides background adjustment or lacks any adjustment components (this type of product represents a technology that was phased out abroad in the 1970s), I recommend that your factory’s system not use a FSSS logic connection, as this may lead to frequent false alarms or no alarms at all ； Check whether the detection method is suitable only for a single fuel, as changing the fuel may cause false alarms in such cases. If everything is working properly, routine maintenance is generally sufficient once every two months; the main task is to check the photosensitive part of the probe, such as whether the mounting holes are blocked (by fouling) ； Is the optical fiber dirty or burned out? ； Whether fuel is in use or not, and whether the flame detection status corresponds accordingly ； Cold air operation status (possible MFT) ； Refer to the original data to check whether there are issues such as data drift in the data processing unit.