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Desulfurization tower spray layer @ FRP desulfurization tower spray layer @ Manufacturer of desulfurization tower spray layer
In the flue gas desulfurization project, the glass fiber reinforced plastic (FRP) slurry spray pipes are usually manufactured in sections and components for easy transportation during the manufacturing process. During on - site installation, experienced FRP installers connect all parts using the winding and bonding process. At present, the connection between the slurry nozzles and the FRP spray pipes has basically changed from the previous flange connection to the winding and bonding process. The winding and bonding process has the advantages of high connection strength, low leakage probability, simple process, convenient construction, and low cost.
1. The structure of the winding layer of the FRP spray pipe is divided into three parts from the outside to the inside.
1. Wear - resistant layer: This part belongs to the outer structure of the winding layer, which is composed of glass fiber surface mat, resin, and wear - resistant silicon carbide. Its main functions are corrosion resistance and wear resistance. The ratio of glass fiber surface mat: resin: silicon carbide is 1:57:38 (by mass), and the thickness is about 5mm.
2. Corrosion - resistant layer: This part is composed of a resin - rich layer and an intermediate layer, which is made of glass fiber surface mat and resin, forming corrosion - resistant performance and is located below the wear - resistant layer. The resin content of the resin - rich layer is more than 90%, and the thickness is about 5mm; the resin content of the intermediate layer is 70% - 80%, and the thickness is about 3 - 4mm.
3. Reinforcement layer: This part is directly wound on the outer wall of the pipe. It is mainly designed to bear pressure and loads under other conditions. Its thickness is determined by calculation according to formula (1) based on the load conditions. The resin content of this layer is 30% - 40%, and it is composed of glass fiber, chopped fiber mat, and resin. It mainly meets the design requirements for stiffness and strength.
2. Inspection of the winding layer of the FRP spray pipe
After the winding and bonding construction is completed, the winding layer should be inspected in accordance with the requirements in HG/T20696 - 1999 "Design Regulations for FRP Chemical Equipment". It is qualified if there are no defects such as delamination, loose structure, fine lines, cracks, exposed fibers, dry spots, inclusions, bubbles, small holes, and resin bumps.
FRP pipes for desulfurization towers
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