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Hebei Zhaofeng Environmental Protection Technology Co., Ltd.

FPP Desulfurization pipeline

Short Description:

Glass fiber reinforced plastic spray pipe fittings-FRP slurry spray pipe used in wet flue gas desulfurization and acid mist exhaust gas cleaning and purification equipment, which is usually manufactured in sections and parts for easy transportation in the manufacturing process.


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FRP spray pipe fittings

1. Glass fiber reinforced plastic spray pipe fittings-FRP slurry spray pipe used in wet flue gas desulfurization and acid mist exhaust gas cleaning and purification equipment, which is usually manufactured in sections and parts for easy transportation in the manufacturing process. The winding and bonding process is used to connect each part when it is installed on site. At present, the connection between the slurry nozzle and the FRP spray pipe is basically changed from the previous flange connection to the winding bonding process. The winding bonding process has the advantages of high connection strength, not easy to leak, simple process, convenient construction, and low cost.

2. The specific size of the glass fiber surface mat can be determined according to the actual pressure and diameter. Because glass fiber reinforced plastic has a high thermal expansion rate, it is required to measure, cut, assemble and bond under the same environmental temperature during construction. It is necessary to prepare in advance the required glass fiber reinforcement materials, resin mortar, sheet resin, surface resin and contact Agent.

3. FRP spray pipe fittings-structure of the winding layer The outer surface structure of the winding part should be consistent with the outer surface of the pipe to ensure that the performance of the winding part is consistent with the overall performance of the pipe. In addition, in order to prevent the slurry from corroding the end faces of the pipes, the butt joints need to be filled with resin cement, and the resin used in the configuration of the cement must be the same as the pipe resin. If necessary, wax the outermost layer to prevent air from entering and cracking (cracking).

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The winding layer structure is divided into three parts from the outside and the inside

A. Wear-resistant layer: This part belongs to the outermost structure of the winding layer. It is composed of glass fiber surface felt, resin, and wear-resistant filler. The main function is corrosion resistance and wear resistance. This layer of glass fiber surface mat: resin: wear-resistant filler: 1:57:38 (mass ratio), and the thickness is about 0.5mm.
Anti-corrosion layer: This part is composed of a resin-rich layer and an intermediate layer. It is composed of glass fiber surface felt and resin to form corrosion resistance and is located under the wear-resistant layer. The resin content of the resin-rich layer is greater than 90%, and the thickness is about 0.5 mm; the resin content of the intermediate layer is 70% to 80%, and the thickness is about 2.0 mm.
B. Reinforcement layer: This part is directly wound on the outer wall of the pipeline, and is mainly designed to withstand pressure and other loads. Its thickness is calculated according to the load conditions according to formula (1). This layer of tree
The fat content is 30%-40%, composed of glass fiber, chopped fiber mat and resin. 3 FRP spray pipe fittings-inspection of winding layer After winding and bonding construction is completed, the winding layer shall be inspected in accordance with the requirements in HG/T20696-1999 “Glass Steel Chemical Equipment Design Regulations”, and there is no delamination, delamination, cracks, turtles Defects such as cracks, exposed fibers, dry spots, inclusions, bubbles, small holes, and resin tumors are qualified.

FPP Desulfurization pipeline (4)

Product characteristics of FRP sprinkler pipe

1. It has electrical insulation. The coating of the spray pipe is made of epoxy resin, which is a thermosetting resin.
2. Good stability, no chemical reaction with most substances, good corrosion resistance.
3. The tube surface coating has strong adhesion.
4. Product advantages. The spray system in the tower adopts a barrier-free spray gas-liquid distribution device, which is arranged on the upper part of the swirl plate by a large-caliber spray pipe structure. The characteristic is to ensure uniform gas-liquid distribution, 360-degree water curtain coverage, and no dead corners. , The opening degree of the sprinkler can be adjusted, which not only guarantees the designed water supply, but also facilitates maintenance and cleaning, and has no strict requirements on water quality. Boiler ash washing, slag washing water, production and living alkaline wastewater, and ash dam return water can all enter the desulfurization The system is reused to reduce operating costs, the spray water supply device is worn out, does not block, and the work and maintenance are simple.
5. Good mechanics. It has the same strength as steel, strong cohesion and compact molecular structure, so its mechanical properties are higher than general thermosetting resins such as PF resin and unsaturated polyester.
6. Good heat resistance, generally 80~220℃. The heat-resistant varieties of epoxy resin can reach 200℃.
7. The curing shrinkage rate is small, generally 1% to 2%. It is one of the varieties with low curing shrinkage rate among thermosetting resins, and its linear expansion coefficient is also very small, generally 6×10-5/℃. Therefore, the volume changes little after curing.


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