Application of mechanical seals in petrochemical industry2

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 and leaks, not only It pollutes the environment, affects human health, and also leads to major accidents such as fire and explosion. We mainly start from the selection of sealing structure of mechanical seals for petroleum refining pumps under different working conditions, so as to reduce the failure rate of seal use 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 oil slurry pumps. This type of pump is characterized by high temperature (370°C-400°C) of mechanical seals for pumps, 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°C 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-compensating ring and adopting the auxiliary rear cover structure are adopted for the mechanical seal of the low-temperature light hydrocarbon pump to increase the anti-pumping capacity of the mechanical seal of the light hydrocarbon pump. Increase seal chamber pressure by flushing to prevent dry seal friction from evacuation. The self-flushing measures can not only ensure a high medium pressure in the sealing cavity, avoid the vaporization or gas accumulation of the medium in the sealing cavity, but also take away the friction heat generated by the friction pair in time, effectively control the temperature rise of the sealing end surface, increase the liquid area, improve the friction state. 2. Valves: Valves are an indispensable part of petrochemical refining units. There are many types and quantities of valves used. Most of the media in chemical production are highly corrosive, toxic or flammable and explosive. When the valve leaks, It will not only cause serious waste of raw materials, energy and products, but also cause serious impact on the environment, and even cause serious safety accidents. Therefore, it is necessary and necessary for us to pay attention to the leakage of valves in the process of petrochemical production. 3. General type seals: With the continuous progress of static sealing technology, rubber sealing products and gasket materials and structures have developed by leaps and bounds, and they are also widely used in various sealing fields, including petrochemical fields. Its affiliated industries will also be encouraged, and the development prospects of the entire industry chain are extremely promising.