A large number of flexible rubber compensators, such as the inlet and outlet pipes of the slurry circulating pump and the pulse suspension system, are used in the circulating system of the desulfuration slurry in the power plant. Many accidents often occur due to poor installation quality and irregular usage. It is improved according to the relevant standard and specification requirements of flexural rubber joints selection, installation and operation.
Rubber flexible compensator (hereinafter referred to as the rubber joint), has been widely used in the desulfurization system, used for pipeline, slurry system oxidation air pipe system, water pump, pipeline system fan inlet and outlet pipe, such as slurry circulating pump inlet and outlet pipe, slurry discharge pump inlet and outlet pipe etc.. The rubber joint has high pressure and elasticity, can withstand a certain amount of axial, lateral and angular displacement, reduce noise and vibration, and also has the advantages of corrosion resistance, wear resistance, etc., but there are frequent failures in the production site. A lot of units have been damaged by slurry circulation pump outlet rubber joints, a large number of slurry exhaled, and the abnormal situation of slurry circulating pump is forced to shut down, which seriously affects the stable operation of the desulfurization system. There are many factors affecting rubber joints in selection, installation and use of rubber joints.
The rubber pipe expansion joint as compensator tube 1, oxidation desulfurization fan outlet mother, according to the measurement and field meter display oxidation fan outlet main pipe to the location of the pipeline temperature up to 110 DEG C, rubber long time contact with high temperature will accelerate the aging speed, coupled with the oxidation of oxygen in the wind speed will be more rapid aging mainly, there will be rubber hardness increase, elongation decreased seriously affect the performance and compensation, seriously affect the strength of rubber joint cracks, final damage caused accidents. After checking the relevant data of the rubber joints, rubber materials include natural rubber, neoprene, Ding Benjiao, Ding Qingjiao, and other types of butyl rubber, various types of rubber and its maximum temperature requirements are different. Although the use of the high temperature part of the rubber material, such as the use of fluorine rubber temperature up to 300 DEG C, improve the rubber joint the grade of the material or the use of metal bellows compensator with high security
2, rubber joint installation quality, relevant information by referring to the rubber joint (HG/T2289-2001 "flexible rubber joint," CJ/T208-2005 "flexible rubber joint"), the specific requirements of the rubber connector installation is proposed, such as axial elongation, rubber joint compression, radial displacement and angular displacement data standard. Exceeding the standard value will lead to greater displacement of the pipeline than the maximum compensation amount of the rubber joint, so that the rubber joint will remain at the limit of the bending displacement and deviation for a long time, which will eventually lead to the abnormal condition of the rubber joint breakage.
3, rubber joint fastening bolt installation is not standardized, resulting in a rubber joint flange fastening bolt is damaged rubber connector installation is not standardized, the top fastening screw in rubber parts of long rubber joints, the operation process is easy to cause the fastening screw will eventually pierce rubber joint rubber wear caused damage.
4, in the use of rubber joint working pressure and high temperature conditions (diameter above DN200, temperatures above 70 degrees, the working pressure should be above 1.5 MPa) with a limiting device, there is a limit bolt free to adjust, not in accordance with the rubber joint allows axial elongation and axial adjustment compression, lead rubber joint elongation the amount, the amount of compression is beyond the regulatory requirements, and a plurality of limiter limit amount is not the same, lead to local stress damage limiting device. The dismantling of rubber joint limiter at will leads to the elongation and compression of rubber joints beyond the requirements of the standard. The rubber joint limit device can not be repaired in time after the damage of the rubber joint limit device, which causes the rubber joint to exceed the compensation. The adjustment and maintenance of the rubber joint limit device is not in place, which results in the larger shear force of the root of the rubber joint, and finally the abnormal condition of the rubber joint root.
We should pay more attention to the importance of desulfurization system of flexible rubber joint, from selection, flexible rubber compensator joint installation and use are to comply with the relevant standards, combining with actual environment in field, strictly control the installation process, ensure the axial elongation, axial compression, radial displacement and angular displacement data in accordance with the specification to ensure the stability of the desulfurization equipment requirements, system operation. If the above contents are improper, we should ask the expert to criticize and correct them.