The reactor is widely used in the field of petroleum and chemical industry, and is a pressure vessel to complete the process of vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation, etc., and the reactants are mostly flammable and explosive, toxic, corrosive, with suspended particles and other media, and the reaction pressure is 0 16 MPa or even higher, leakage can cause serious accidents, so the tightness of the kettle is required.
Since the 90s of the 20th century, a catalyst company in Sinopec has used dozens of 10 m3 polymerization reactors to prepare molecular sieve products, the raw materials are mainly silica gel, n-butylamine, pyridine, lye and other media, the temperature is below 200, and the pressure is 0 14 MPa, the traditional seal for kettle is suitable for flammable, explosive, strong corrosion, with particles and high sealing requirements under vacuumDouble-acting mechanical seals(static ring graphite, dynamic ring silicon carbide or stainless steel), and equipped with GD type balance tank auxiliary device.
The double-end mechanical seal is a device to prevent fluid leakage by relying on the end face (friction pair) perpendicular to the axis of rotation under the action of fluid pressure and elastic force of the compensation mechanism, as well as the cooperation of the auxiliary seal, to keep it close and slide relatively, which is basically the same as the principle of the single-end mechanical seal. When the double-end mechanical seal structure is working, under the combined action of fluid pressure and elastic force of elastic elements, an appropriate specific pressure (compression force) is generated on the end face of the sealing ring, so that the two contact end faces (dynamic ring and static ring end face) are closely attached to each other, and a very thin liquid film is maintained in the very small gap between the two end faces, so as to achieve the purpose of sealing. The double face seal has two end seals, which play the role of double protection, if the primary seal fails, the secondary seal can still be sealed to prevent leakage.
The GD type balance tank is used for pressurization, storage and cooling of the sealing liquid in the double-end mechanical seal, and the nitrogen is introduced into the balance tank through the pressurized port, and the pressure is higher than the medium pressure in the kettle 005～0.At 10 MPa, the sealing fluid is circulated in a cycle of clean water instead of white oil (to prevent contaminants), which acts as a cooling and lubricating effect, not only to ensure the proper operation of the mechanical seal, but also to detect the failure of the primary seal (Figure 1).
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