What are the requirements for the sealing method of an external coil reactor?

The sealing design of an external coil reactor must consider multiple factors, including equipment safety, media characteristics, and operating conditions. The core requirement of the sealing system is to ensure high-pressure sealing at the connection between the coil and the reactor body, preventing leakage of the heat transfer medium or intrusion of external contaminants. For high-temperature and high-pressure conditions, flange connections with metal spiral wound gaskets or graphite composite gaskets are typically used. The materials must be compatible with the coil and reactor body materials, such as stainless steel coils with 304/316L gaskets. Dynamic sealing points, such as the agitator shaft penetration, require double-end mechanical seals and a sealing fluid circulation system for lubrication and cooling. Strict machining precision is required for the sealing surfaces; surface roughness must be controlled below Ra1.6, and flatness deviation must not exceed 0.05 mm/m to ensure uniform contact.

The sealing structure must consider the stress effects caused by differences in thermal expansion. The difference in the thermal expansion coefficients between the coil and the reactor body may lead to deformation at the connection point; therefore, expansion joints or flexible connection structures are often used in the design to compensate for displacement. For corrosive heat transfer media, the sealing material must have corrosion-resistant properties, such as Hastelloy sealing rings or PTFE-coated gaskets. The pressure rating of the sealing system should be 1.5 times higher than the operating pressure, and a pressure sensor should be installed to monitor the sealing cavity status in real time. Regular sealing performance testing is a necessary maintenance measure, including leakage rate testing and sealing surface wear inspection, to ensure long-term operational reliability.