Application of mechanical seals in petrochemical industry1

Application of mechanical seals in petrochemical industry 1. Mechanical seals for pumps: The reliability of pumps depends to a large extent on mechanical seals. In petroleum seal factories and chemical enterprises, most of the fluids handled are flammable and explosive. Once the mechanical seal fails to leak, it will not only pollute the environment and affect the health of the mechanical seal factory, but also cause major accidents such as fires and explosions. We mainly start with the selection of the sealing structure of mechanical seals for petroleum refining pumps under different working conditions to reduce the failure rate of the seal and improve the reliability of use. 1. Mechanical seals for high-temperature hot oil pumps High-temperature hot oil pumps mainly include constant bottom pumps, reduced bottom pumps, and catalytic slurry pumps. The characteristics of this type of pump are high mechanical seal temperature (370℃-400℃) and oil viscosity. Large, there are impurities at the bottom of the tower. 2. Mechanical seals for gasoline and diesel pumps The mechanical seals of this type of pump adopt a static structure (the pump with a temperature higher than 200℃ adopts a bellows structure). One is to avoid the heat generated by high-speed stirring; the other is to prevent the spring from transmitting torque. 4. Measures such as increasing the length of the tail of the non-compensation ring and adopting the auxiliary back cover structure for the mechanical seals used in low-temperature light hydrocarbon pumps to increase the anti-evacuation ability of the mechanical seals of light hydrocarbon pumps. Increase the pressure of the seal cavity by flushing to prevent dry friction of the seal caused by evacuation. Self-flushing measures can not only ensure that there is a higher medium pressure in the sealed cavity, and avoid the vaporization or gas accumulation of the medium in the sealed cavity, but also can take away the friction heat generated by the friction pair in time, effectively control the temperature rise of the sealing end surface, and increase The liquid phase area improves the friction state. 2. Valves: Valves are an indispensable part of petrochemical refining equipment. They use many types and large quantities of valves. Most of the media in chemical production are corrosive, toxic or flammable and explosive. When the valve leaks, Not only will it cause serious waste of raw materials, energy and products, but also have a serious impact on the environment, and even cause serious safety accidents. Therefore, it is necessary and we should pay attention to the problem of valve leakage in the petrochemical production process. 3. Ordinary seals: With the continuous progress of static sealing technology, rubber sealing products and gasket materials and structures have made great progress, and they are also widely used in various sealing fields, including petrochemical fields. By the way Its affiliated industries will also be encouraged, and the development prospects of the entire industry chain are extremely impressive. Keywords: seal factory, mechanical seal factory, pump mechanical seal