Detailed analysis of prolonging the service life of the three duct wear-resistant thermocouple was provided

My company two 3 000 t/d production line since its launch in October 2010 copies, the service life of the rotary kiln three times the wind temperature measuring thermocouple average each no more than 4 days, not only increase the maintenance workload and seriously affect the process control, increase operation difficulty and cost of production. To prolong the service life of the thermocouple, through many experiments, find the countermeasure, make three times the wind temperature measuring thermocouple service life up to 15 days. Rotary kiln using the selected temperature measuring thermocouple is chang the wear-resistant thermocouple, the following is prolonging the service life of the three duct wear-resistant thermocouple was provided for detailed analysis.

1 cause analysis for my company use ingredients, 100% calcium carbide slag in the process of calcining clinker fly sand is larger, three times the wind temperature measuring point wind speed faster, higher temperature ( 950～1 050℃） , with the grain of high speed wind erosion on wear-resistant thermocouple, thermocouple badly worn. Found at the scene, and each change of thermocouple is because the sand flushing all cause thermocouple coat worn out, internal hot wire will burn out.

1) 2 solutions The thermocouple before the gate valve should behind the gate valve, high speed wind from the past, at the bottom of the slide valve gate valve to the thermocouple protection.

2） With a length of 200 mm, the diameter & Phi; 35 mm steel pipe welding in the location of the thermocouple, in the central tube open a & Phi; 15 mm hole, welding on the outside of the hole a screw M12 mother, will be hot thermocouple ( Φ 30mm） Inserted into the steel tube on the nut screw a M12 & times; 30 mm screw, thermocouple fixed on the steel pipe. Runtime for every 2 h to post inspection when loosen the screw, the thermocouple clockwise 45 & deg; Again after fastening screws, fixed thermocouples. This makes thermocouple head wear uniform, achieve the goal of extending the service life of the thermocouple.

the improved wear resistance thermocouple and process arrangement of gate valve as shown in figure 1.

3 improvement effect this device and its operation method to solve the three wind temperature measuring thermocouple problem of short service life, also solved the thermocouple caused by long-term lopsided wear coat can't make full use of the question. Make three times the wind temperature measuring thermocouple to extend the service life as well as to improve the production environment, grate cooler in a cement system clean and low cost operation laid a solid foundation, also reduced the labor intensity of workers, reduce the wastage of the spare parts. Recommendation:

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