Structure of Large Stainless Steel Reactors

A large stainless steel reactor is a non-standard pressure vessel designed for mixing, heating, cooling, reaction, and storage. Its structure is usually divided into the reactor body, transmission system, mixing system, sealing system, heat transfer system, support system, and process accessories.

Reactor Body and Head：

The reactor body is the main pressure-bearing part, usually made of a cylindrical shell and dished heads. The upper head is connected with the reactor cover, and the lower head forms the discharge area. Common materials are SUS304 and SUS316L, and special alloys can be selected for highly corrosive media. The internal surface can be polished to reduce residue and facilitate cleaning.

Reactor Cover and Process Nozzles：

The reactor cover carries key process interfaces, including feed ports, discharge ports, vent ports, vacuum ports, pressure gauge ports, temperature sensor ports, sight glasses, manholes, sampling ports, and safety valve interfaces. The cover can be designed as a flat cover, dished cover, or flanged removable cover according to pressure and maintenance requirements.

Transmission and Mixing System：

The transmission system consists of a motor, reducer, coupling, and support frame. The mixing system includes the stirring shaft and impeller. Common impeller types are anchor, frame, paddle, turbine, propeller, ribbon, and scraper types. The selection depends on material viscosity, mixing purpose, and heat transfer requirements. High-viscosity materials often use anchor or ribbon agitators, while low-viscosity liquids are suitable for paddle or turbine agitators.

Sealing System：

The sealing system prevents leakage at the stirring shaft. Common types include:

Packing seal – simple structure, suitable for low-pressure or non-hazardous media

Mechanical seal – reliable sealing, suitable for medium and high pressure, vacuum, or volatile media

Magnetic seal – non-contact transmission, suitable for flammable, explosive, toxic, or high-purity applications

Heat Transfer System：

Large reactors are usually equipped with a jacket, internal coil, or external half-pipe coil. The jacket can circulate steam, thermal oil, hot water, or cooling water for temperature control. Internal coils provide higher heat transfer efficiency but require more cleaning attention. Electric heating rods can also be installed in the jacket for indirect heating.

Support and Accessories：

The reactor is supported by lug supports, leg supports, or skirt supports. Accessories may include condensers, receivers, separators, filters, level gauges, pressure relief valves, bursting discs, CIP spray balls, and control instruments. These components are selected according to process flow, safety standards, and automation requirements.

Customization for Industrial Projects：

Our large stainless steel reactors can be customized by volume, design pressure, temperature, material grade, mixing form, sealing type, heating method, and nozzle layout. We support OEM, ODM, and project-based cooperation for chemical, pharmaceutical, food, cosmetic, and new energy material applications. For technical data or quotation requests, please share your process parameters with our engineering team.