Thread Content
The adjustable shrinkage split type wear-resistant type is used in the powder feeding pipeline of coal-fired boilers to adjust the balance of the air pressure of pulverized coal in the pipeline to ensure the stability of the boiler's combustion. Adjustable shrinkage hole flow area: Minimum 25% of cross-sectional area ； is 100% of the cross-sectional area. The adjustable shrinkage hole and pipe connection method use flange form. Material: The cylinder material is: Q345 core board material: Rare earth wear-resistant alloy steel (40CrMoMnSiRE) wear-resistant adjustable shrinkage hole features: 1. It adopts a double-core adjustable shrinkage hole plate. The double-core plate reciprocates from the center of the pipe outward to adjust the opening area. The pulverized coal in the pipeline always flows in the center of the pipeline, which solves the shortcomings of the second generation adjustable shrinkage hole eccentric flow of pulverized coal, reduces flow loss, avoids excessive wear of the pipe wall, and thereby extends the service life of the powder feeding pipeline. 2. Designed with a sealing device, pulverized coal can never penetrate into the shrinkage cavity, so it can always maintain a flexible opening and closing state and has a long service life. 3. The double-core board and the wear-resistant channel are made of rare earth wear-resistant steel, which has excellent wear resistance, good sealing performance, flexible start-up, good adjustment performance, beautiful appearance and fine workmanship. 4. Adjustable shrinkage hole structure design, the shell adopts a fixed seal, and the shaft end adopts a packing bearing seal structure to ensure that the adjustable shrinkage hole has no leakage and no powder accumulation. The adjustable shrinkage holes can be adjusted easily and flexibly, and the hot operation will not cause air leakage, deformation, or jamming. Installation and use 1. The existing pipelines with shrinkage holes are connected by flanges, and the flange connections of the existing pipelines are sealed with asbestos rubber gaskets. 2. The connection sealing surface should be cleaned before installation, and no debris is allowed to affect the sealing performance. 3. Turn the handwheel clockwise to the closing direction. 4. The wearable part of this shrinkage cavity is the gate. When the gate plate wears out and fails, you only need to replace the gate plate and it can be used normally.