Non-metallic fabric skin is also called desulfurization ring and non-metallic fabric ring. It is mainly made of multi-layer soft material. It has many advantages, such as wide temperature range, high pressure, strong corrosion resistance, good flame retardancy, sound absorption and shock absorption, good flexibility and so on. Compared with the traditional metal bellows, it avoids the hard force transmission of connection transmission, eliminates the vibration of pipeline, and can protect the fan when special circumstances occur. Moreover, the non-metallic fabric skin is far superior to the metal bellows in transportation, installation, cost and maintenance. Non-metallic fabric skin can be divided into silica gel skin and fluorine gel skin. In the wind channel fabric compensator with normal silica gel skin and low specific heat resistance, the insulation layer should be used before < 600 C. The temperature resistance of the fabric compensator for fluorine rubber skin is less than 1200 C. In the long-term work and use, the skin may be damaged, in this case, we need to find appropriate and effective ways to repair the skin. 1. Stop the operation of the machine, clean up the ash deposited on the pressing plate and repair the damaged skin. Be careful to damage the PTFE skin at the bottom of the groove when cleaning. 2. Clean up all the floating ash on the skeleton of the non-metallic expansion joint. 3. Quickly put high elastic glue on expansion throttle plate and both sides, and fill the groove with high temperature, corrosion resistance and high elasticity sea surface polyurethane filler before curing. 4. Seal a layer of glue every time the filler is filled, until the crevice of its pressure plate is filled, the top layer is very important. We must carefully and carefully use high elasticity, acid resistance. Glue leveling. 5. The last step is to deal with the joints of non-metallic expansion joints. All joints need to be smeared with high elastic corrosion-resistant adhesive on one side. The thickness of joints should be maintained above 3 mm. The machine can be put into use after 6 hours'standing. Hongsheng desulfurization ring belt can effectively prevent the corrosion of sulfur dioxide gas to the pipeline. It can well compensate the various displacements of the pipeline when used as the outer skin of the compensator, absorb the vibration of the pipeline caused by the fan. The effect is similar to that of the soft connection of the fan. The special skin ring belt for corrosion-resistant desulfurization generally has silica gel skin and tetrafluoroethylene cloth. Asbestos cloth, insulation blanket, glass fiber and high temperature resistant steel wire layers are composed of composite skin made of different materials in general test, which can adapt to different media of pulverized coal smoke very well. For high temperature flue gas pipeline has a good protective effect, the general use effect of more than 3 years.