Decarbonisation Technology – August 2021

resulting in significant power savings and reduced compressor horsepower. Plate-fin heat exchangers are essential for cryogenic gas processing applications, including air separation, LNG liquefaction, nitrogen rejection, natural gas liquids (NGL) recovery, CO 2 liquefaction, propane dehydrogenation, hydrogen recovery, and other low-temperature natural gas and petrochemical processes: ➊ The warm process stream fluid enters the heat exchanger through steel inlet nozzle(s) on the vessel shell. The inlet nozzles are connected to the aluminum inlet pipes of the exchanger by an aluminum to stainless steel transition coupling. ➋ Inside the BAHX, the warm stream cools as it flows against a cold stream. ➌ The cold stream enters the vessel either as a liquid or two-phase fluid directly from a distillation column (or expansion valve in the case of a refrigerant). ➍ A liquid level is formed outside the BAHX core to create a liquid head that drives the cold stream liquid through the core. ➎ A disengagement space above the core causes

are at the heart of low-temperature natural gas, air separation and petrochemical processes worldwide. BAHX provide optimal thermal performance and operating efficiency vs other heat exchanger types, and are at the core of our standard and modular plant solutions and process technologies. Externally, a cold box is a carbon steel enclosure with flanged terminations to facilitate a simple on- site connection to plant process pipework. The use of plate-fin technology is an alternative to traditional shell-and-tube kettle reboilers. Instead of a tube bundle, the external vessel houses one or more plate-fin heat exchangers and provides around 10 times more heat transfer surface area and up to 20 times more ‘UA’ than the equivalent tube-and-shell unit. The superior heat transfer performance can be utilised to produce a much more compact unit for new installations or provide more performance to existing installations by replacing the tube bundle with a BAHX retrofitted into the same shell. Plate-fin heat exchanger construction permits close temperature approaches down to 2°F (1°C),

WEBINAR

Petrochemical and refining operations of the future will include more plastics oil, obtained from chemical recycling, in the feedstock mix to establish circularity in the plastics lifecycle or to qualify for fuels category. An important step in this value chain is to purify and upgrade the raw plastics oil obtained from depolymerization.

Watch this webinar to learn about: • The environmental necessity of recycling plastics. • Sulzer Chemtech’s portfolio in plastics recycling.

• SuRe™ Styrene – Sulzer Chemtech’s GTC licensed technology to upgrade pyrolysis crude styrene, obtained from waste PS to ultra-high purity (>99.95wt%) styrene monomer. • Purification and upgradation of pyrolysis oil obtained from mixed plastics or tires for downstream applications for e.g., naphtha cracker feedstock, fuels category, etc.