Which type of nozzle is better for semi-dry spray repair?
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Hello everyone. We have a semi-dry spraying machine imported from Germany, and the coke oven is of the JN-80 type. We would like to carry out semi-dry spraying repair on the furnace head area on the coke side. But the nozzle didn’t work well. The steel pipe used at first was heated with gas welding and then bent into an arc shape; however, after just a few uses, the coarse particles in the spray material wore through the pipe. This time a tee was used, but the results were still not satisfactory – due to the lack of an angle, the material often gets clogged. So I would like to ask everyone what approach should be taken with this nozzle? Also, where is the best place to get spray repair materials that work well? Thank you all!
Ordinary steel pipes definitely won’t work; wear-resistant alloys are needed. Among the foreign-funded companies that produce spray coatings in China are Pailigu in Dalian and Kaideli in Lianyungang; among the domestic ones is Henan Rongyao Luyao, etc. Also, may I ask: do you use hot spraying or cold spraying? It is said that a company in India has achieved great success with hot dry spray repair.