Internally rifled boiler tubes are also called Multi Lead Rifle boiler tubes. It is a special-shaped steel pipe with spiral ribs on the inner surface. Due to the concave-convex internal thread on the inner wall, it can effectively overcome the laminar flow caused by the slow flow of the medium in the steel pipe and suppress the steam film effect on the inner wall of the steel pipe. Therefore, the heat transfer effect of the boiler water wall is greatly improved, and the tube wall temperature is more uniform.
Internally rifled boiler tubes are mostly used to make the water wall tube of the boiler wall. It is the main heat exchange component of the power station boiler. It rotates the water in the tube through the spiral rib on the inner wall of the tube, thereby destroying the film effect in the heat transfer process. , To achieve the effect of nucleate boiling. Internally threaded pipes are divided into ordinary internally threaded pipes and optimized internally threaded pipes. Ordinary internally threaded pipes are divided into type A and type B. The helix angle is 30°. Compared with ordinary round pipes, the heat transfer efficiency can be increased by 30%. The optimized internally threaded tube is a new generation of internally threaded tubes developed on the basis of the traditional internally threaded tube. Its thread lift angle reaches more than 40°. Compared with the ordinary internally threaded tube, it can increase the heat transfer efficiency by 20%. Compared with traditional internally threaded pipes, it has a better heat transfer effect.