The column shell is the primary pressure-retaining vessel of an absorption column system, providing structural integrity to house internal components such as packing materials, trays, distributors, and mist eliminators. It maintains the process environment by containing gases and liquids under specified pressure and temperature conditions while withstanding corrosion from chemical processes. The shell is typically fabricated from materials such as carbon steel, stainless steel, alloy steel, or fiberglass reinforced plastic, selected based on process compatibility and mechanical requirements. Design parameters include design pressure (1.0–1.6 MPa), design temperature (-40–200 °C), nominal diameter (600–6000 mm), wall thickness (6–60 mm), overall height (5000–40000 mm), corrosion allowance (1–6 mm), and weight (500–50000 kg). Tolerances on diameter are ±0.5%, and surface roughness ranges from Ra 3.2 to 6.3 μm. The shell is designed and verified according to standards such as GB/T 150, GB/T 9019, GB/T 713, GB/T 3280, GB/T 1804, GB/T 1031, and GB 50009. Leak test pressure is 1.1–1.5 MPa, and wind load considerations are 0.5–1.5 kN/m² for outdoor installations. These values are reference ranges and must be confirmed for the specific model and application with the legal manufacturer or supplier. The column shell ensures safe and efficient operation of the absorption process by providing a sealed environment for gas-liquid interaction, with structural stability against internal pressure, external loads, and thermal expansion. Proper material selection and adherence to design codes are critical for long-term reliability and corrosion resistance.
The column shell functions as a containment vessel that maintains the internal pressure and temperature conditions required for the absorption process. It provides a sealed environment where gas and liquid phases interact, with the shell's design ensuring structural stability against internal pressure, external loads, and thermal expansion while facilitating proper fluid distribution and collection. The shell's cylindrical shape distributes stress evenly, and its thickness is determined by the design pressure and temperature. The material of construction is chosen to resist corrosion from the process fluids. The shell also supports internal components and provides nozzles for feed, product, and instrumentation connections. Its design must account for wind loads, seismic loads, and weight, and it must be verified by hydrostatic testing to ensure leak tightness.
