In recent years, Fabric expansion joints are in the direction towards high temperature and improve the life of the development. In the power industry, with the development of circulating fluidized bed boilers, the requirements of the expansion joint is higher, expansion of the circulating fluidized bed cyclone generally need to install expansion joints, and the working fluid temperature here has reached about 1000℃. Therefore, high-temperature design of Fabric expansion joints is an important point. But the difficulty of high-temperature fabric expansion joints is less dependent on the choice of non – metallic materials (Resistant to more than 1000℃ non-metallic materials is still quite a lot). The key is to take what kind of structure and make the metal frame at the lowest possible temperature. At the same time, the metal rack should take special structure to reduce thermal stress. According to the success of the experience gained on the gas turbine, a fabric expansion joint of circulating fluidized bed has been designed and has been delivered, can be applied to metallurgical, chemical and other industries of high-temperature smoke duct.
The life of fabric expansion joints has been the focus of the majority of users. As a result of fabric expansion joints in the operation of the stress is less than the metal expansion joint. After adopting appropriate material and reasonable structure, its fatigue life should be better than the metal expansion joint. An important factor that directly affects life expectancy will be the aging of non-metallic materials, this requires further work on material selection. The specific life of the expansion joint may also have to be running time to prove. However, according to the unit on the use of non-metallic expansion joint understanding of the situation, there are many closing to metal expansion joint. Therefore, as long as the proper selection and reasonable process, fabric expansion joint life should be able to achieve the desired effect. It should be noted that the service life of fabric expansion joints and its structural design, selection, processing, installation are very closely related. Some products do not meet the expected life expectancy, most of these relate to this factors.
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Characteristics and Application of fabric expansion joint.pdf