Procestromen

Procestromen, commonly translated as process streams, are the fundamental conveyors of material and energy in chemical process industries. In a process flowsheet they represent the streams that connect equipment such as reactors, distillation columns, heat exchangers, and separators. Each stream is described by a set of properties and a state that may change as it passes through the plant.

Material streams carry chemical species and are characterized by mass or molar flow rate, composition, temperature, pressure, and phase. Energy transfer is often represented as part of a stream by its enthalpy or temperature, making some streams primarily energy carriers (e.g., steam or cooling water) while also transporting material in certain contexts.

Modeling and analysis: Streams are the objects on which mass and energy balances are formulated. Process simulators track stream properties to ensure conservation laws across units. They are essential for design, optimization, and control and are used in pinch analysis for heat integration.

Examples: In a refinery, feed streams and product streams, recycle streams, bypasses, and utility streams (steam, cooling water).

Standards and data: Names, units, and property methods vary by software, but common fields include flow rate (mass or molar), composition, temperature, pressure, and phase. Consistent definition of streams enables clear communication and accurate thermodynamics.