Selection of mechanical seals for pumps used in wet flue gas desulfurization and routine maintenance

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This post was last edited by Steven_p0kTk on 2023-12-22 at 10:55. The wet flue gas desulfurization process involves various corrosive substances, therefore extremely high requirements are placed on the sealing performance of pumps. The selection of the mechanical seal for the pumps used in wet flue gas desulfurization units must be based on parameters such as the physicochemical properties of the fluid being transported, the pressure in the sealing chamber, the fluid temperature, the operating speed, the characteristics of the fluid, and the available space for installing the seal. In most cases, rotary mechanical seals are used as the standard sealing elements. The load coefficient of wet flue gas desulfurization centrifugal pumps is generally between 0.63 and 0.85; when the pressure in the sealing chamber exceeds 0.7 MPa, balanced mechanical seals should be employed. For media that are non-corrosive or only slightly corrosive, internal mechanical seals can be used ； For highly corrosive media, since it is difficult to select the appropriate springs for the elastic components, an external mechanical seal can be used at lower pressures ； For media that are prone to crystallization, contain solid particles, and have high viscosity, a single-spring structure should be used. The daily maintenance of the mechanical seal in pumps used for wet flue gas desulfurization should focus on the following points: Regular inspection – Check the degree of wear of the mechanical seal regularly; if severe wear is detected, it should be replaced promptly. Cleaning: Regularly clean the mechanical seal to prevent impurities from entering the sealing surface and affecting its performance. Lubrication: Regularly apply lubricant to the mechanical seal to maintain an optimal lubrication level and reduce wear. Temperature control: The temperature varies significantly during the wet flue gas desulfurization process; it is necessary to regulate the operating temperature of the pumps to prevent excessive temperatures from affecting the performance of the mechanical seals. Pressure control: The pressure varies significantly during the wet flue gas desulfurization process; it is necessary to regulate the operating pressure of the pumps to prevent excessive or insufficient pressure from affecting the performance of the mechanical seals. The selection and maintenance of mechanical seals for pumps used in wet flue gas desulfurization are crucial to ensuring the proper operation of this process. Choosing the appropriate mechanical seal can effectively prevent the leakage of corrosive media, improve the operating efficiency of the pump, and extend its service life. At the same time, regular maintenance and inspections allow for the timely detection and resolution of issues with mechanical seals, ensuring the stable operation of the wet flue gas desulfurization process.