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Centrifuges are widely used in many fields of the national economy, such as chemical and pharmaceutical industries. They are still the main equipment for solid-liquid separation in the production process of chemical intermediates and pharmaceutical raw materials. Due to the different physical and chemical properties of the applications, processes and media used in centrifuges in these industries, there are different requirements for centrifuges, such as material requirements, structural requirements, anti-corrosion requirements, and explosion-proof requirements.
Explosion protection requirements
We know that the three elements that generate explosions are temperature, fire source, oxygen, and the simultaneous existence of three basic conditions to prevent chemical explosion. It is the basic theory for preventing chemical explosion of combustible materials. In other words, the essence of all technical measures to prevent chemical explosion of combustible materials is to prevent the simultaneous existence of three basic conditions of chemical explosion. Among them: (1) temperature, for a specific medium, whether it is liquid phase or gas phase, the operating temperature of the centrifuge should be considered in the process design, which depends mainly on the process conditions, and will not be elaborated here; (2) Fire Source, in the design of the centrifuge, the application of sufficient safety air-rotor pump room for moving parts to eliminate the possible mechanical friction and impact, at the same time, the machine must have measures to eliminate static electricity. For brake devices, mechanical friction brakes should not be used, generally in the form of electrical energy brakes (non-contact brakes, the disadvantage is that the brake time is longer than the contact type, especially when fully loaded) This is especially true in the case of large inertia.) In addition, for the transmission belt, the anti-static belt is used to eliminate or reduce the possibility of static electricity generation; (3) oxygen is generally protected by inert gas, and the oxygen concentration is maintained by replacing the inside air with nitrogen inside the centrifuge. Within the safe range.
Explosion-proof measures
At present, the nitrogen protection of the centrifuge generally used is actually only a nitrogen gas inlet pipe and a nitrogen gas outlet pipe are arranged on the casing, and the inner cavity is filled with nitrogen gas when the centrifuge is working. As to whether the nitrogen concentration can reach the safe range, there is no quantitative control, and therefore, the reliability of the nitrogen protection is poor. An improved nitrogen protection system is designed with an online oxygen detection device and a pressure transmission sensor to detect the oxygen concentration in the centrifuge chamber during operation, and to perform quantitative control to control the oxygen content within a safe range (also That is to say, the oxygen concentration in the machine is outside the explosion limit of the flammable and explosive medium).
Editor's note: In the pharmaceutical industry, raw material handling equipment such as centrifuges is very important, and the safety of equipment is also the focus of modern people. This time, China Pharmaceutical Machinery Equipment Network introduces an effective explosion-proof system design for centrifuges in chemical and pharmaceutical industries, ensuring safe production and combining nitrogen protection with digital oxygen meters.