This article takes the blast furnace as an example to introduce in detail the principles and methods of online monitoring of refractory defects in the blast furnace body, hot blast pipes, and hot blast ports. From coke ovens, rotary kilns, hot blast stoves, and blast furnaces in ironworks, to ladle, converter, ladle, and tundish in steelworks, the equipment has the structure of refractory materials such as heat preservation lining. This method is also applicable.
Why monitor blast furnace refractory defects
The blast furnace smelting process is a continuous, large-scale, high-temperature production process, and its stability is crucial. In production, each system cooperates and restricts each other to form a continuous, large-scale high-temperature production process. No matter which part of the fault occurs, it may cause the shutdown of the entire system and cause serious economic losses. In severe cases, it even threatens the lives of the staff.
Because the blast furnace body works in a high temperature state for a long time, the equipment has a structure of refractory materials such as heat preservation lining to ensure the temperature in the furnace and the protection of the outer wall material of the furnace. The quality of refractories not only determines the efficiency of the production process, but also plays a vital role in the safety of equipment and operators. Therefore, in the blast furnace smelting, the monitoring of the surface temperature of the furnace body has always been a difficult point that requires focus and continuous improvement.
The blast furnace lining is made of refractory materials that can resist high temperature and chemical attack. Once the refractory material cracks or falls off, The high-temperature molten iron (about 1350℃) in the furnace will leak directly to the water cooling system, insulation system, and furnace wall along the cracks or shedding parts, which will seriously cause the entire blast furnace to be scrapped and even personnel safety.
The local thinning of the furnace lining will transfer the high temperature of the local high-temperature resistant materials to the furnace wall through the water cooling system and the thermal insulation system. The results of surface temperature monitoring of the blast furnace body can objectively reflect the degree of damage or cracking of the blast furnace lining.
Insufficiency of traditional detection of refractory defects
The traditional method of blast furnace lining defect detection is generally to see whether the furnace shell is red, swollen and leaking, or multi-layer burying thermocouples by observing and hearing, and infer the blast furnace based on the temperature of each layer of thermocouple Erosion of the body.
a) The early defects of the furnace lining could not be found in time, and the timing of repairing was delayed;
b) Unable to determine the defect location and damage degree of furnace lining;
c) Unable to guide repair welding, grouting, and blindly overhaul.
FOTRIC online intelligent thermal image monitoring system, scientific monitoring
The FOTRIC online intelligent thermal image monitoring system can monitor in real time 7×24 hours, measure the maximum temperature of the overheated area, the size and position of the overheated area, so as to determine the defect location of the refractory lining, and help us analyze the severity and defects of the refractory defect Area size, etc. Formulate a construction plan to guide the grouting and lining construction work.
The back-end intelligent monitoring platform, FORTRIC TrendIR, supports up to 16 channels of full-radiation video access and full-range monitoring; for different parts of the refractory, different alarm thresholds can be set for instant alarm. With it, do you still need to change the refractory regularly based on experience?
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