1.Problems existing in the coal flame detection device
About combustion of inferior coal in the boiler, coal flame detection device signals appear unstable, frequent fluctuation phenomenon, cause the oil system of interlocking input steady combustion, coal mill tripping, RB action, such as unusual, especially in low load operation stage, the coal mill run less quantity, if the coal flame detection signal is not stable, exist MFT misoperation, in turn, lead to the unit not safe hidden trouble, seriously affecting the safe and stable operation of unit. Moreover, the proportion of mixing and burning of inferior coal is limited, the operation cost is increased, and the economic benefit of the unit is affected.
2.Solutions to the problems existing in the coal flame detection device
(1) The installation position of the coal flame detection device is changed from the lower part of the burner to the upper part of the burner to "eliminate" the carrier that can carry coking. The coke will automatically fall off when it reaches a certain weight. And because of the negative pressure effect of the furnace, the burner flame will tend to shift upward, which can increase the covering area of the fire detector of the coal flame detection device, maximize the detection of the burner's stable combustion zone, and obtain the best detection effect.
(2) The fiber components of the coal flame detection device are thickened and changed from the original fiber components with a diameter of 2.5mm to the fiber components with a diameter of 5mm, so as to increase the lighting area and reduce the influence of factors such as unstable and insufficient combustion caused by coal blending and combustion, and changes in the position of the burner's stable combustion area.
(3) According to the inferior coal quality mixed with coal, adjust the tilt Angle of the fire probe of the coal flame detection device, so that it can see the stable combustion zone to the maximum extent and obtain the best detection effect.
3.Implementation effect of coal flame detection device
The transformation effectively solved because of the furnace flame detection device installation control coal coking, burner and combustion instability stable-combustion area change caused by many factors such as the problem of the coal flame detection device detection signal, reduces caused by unstable coal flame detection device detection signal of micro oil system of interlocking input stable-combustion, coal mill tripping, RB action, such as abnormal situation, improve the reliability of the unit MFT main and auxiliary protection and safe operation of the unit level.
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