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Spray pipes, FRP desulfurization equipment, FRP slurry outer pipes, slurry circulation pump strainers, FRP liquid distributors, spray FRP branch pipes, FRP spray layers resistant to slurry scouring, FRP water-washing spray pipes, absorption spray pipes, FRP slurry spray pipes, absorption tower spray layers, FRP chimneys, FRP water-sealed circulation tanks, FRP ammonium sulfate slurry tanks, slurry circulation FRP pipes
In the flue gas desulfurization project, the 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 use the winding and bonding process to connect all parts. Currently, 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 possibility, 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 outermost structure of the winding layer, consisting 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, consisting of glass fiber surface mat and resin, forming corrosion resistance, and is located below the wear-resistant layer. The resin content of the resin-rich layer is greater than 90%, with a thickness of about 5mm; the resin content of the intermediate layer is 70% - 80%, with a thickness of 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 the load conditions using formula (1). The resin content of this layer is 30% - 40%, consisting 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 considered qualified if there are no defects such as delamination, it is tight and solid, and there are no fine lines, cracks, exposed fibers, dry spots, inclusions, bubbles, small holes, resin bumps, etc.
FRP pipes for desulfurization towers
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