Process Equipment Update
Sean Ottewell reports on the latest high-pressure spiral heat exchangers, plate heat exchangers and brazed plate heat exchangers that are designed to reduce fouling and cut corrosion – two major problems for process operators.
Sean Ottewell berichtet über modernste Hochdruck- Spiralwärmetauscher, Plattenwärmetauscher und gelötete Plattenwärmetauscher, die Ablagerungen und Korrosion verringern, zwei wesentliche Probleme für Anlagenbetreiber.
Sean Ottewell enquête sur les tous derniers échangeurs de chaleur haute pression à spirales, les échangeurs de chaleur à plaques et à plaques soudées conçus pour réduire la souillure et la corrosion qui sont deux importants problèmes se posant aux exploitants.
Fouling and corrosion tackled by new heat exchangers
pressure spiral heat exchangers (HPSHEs). These are high-pressure versions of the company’s existing SHEs with a design pressure of 100 barg and what the company describes as a highly efficient, self- cleaning effect. True process heat exchangers, they can replace shell-and-tube units (S&Ts) in sensitive processes, eliminate fouling problems and offer a high level of heat recovery. Fabrizio Palmeri, manager, market unit refinery,
A
Fig. 1. An HPSHE requires minimal servicing and is easily accessed.
Picture courtesy Alfa Laval.
Alfa Laval, says: “An HPSHE continuously recovers maximum heat energy from bottom residues, while its single channel geometry gives it an ultra-efficient self-cleaning effect that prevents it from fouling. The HPSHE’s capability to withstand pressures of up to 100 bar and high temperatures makes it an
problem that causes continuous concern for many process companies is fouling of heat transfer equipment. Alfa Laval has risen to this challenge with its new high-
efficient process heat exchanger for visbreaking, fluid catalytic cracking, desalting, coking and other processes. Although compact, it offers two to three times higher heat transfer efficiency than an S&T unit.”
An S&T unit normally requires cleaning several
times a year. An HPSHE only requires servicing every four to five years and can be cleaned easily by backflushing, hydroblasting, or in-line chemical cleaning. HPSHEs interiors are accessed by means of an easily opened front cover. This gives them a small service footprint, unlike S&Ts where space must be allowed for long tube bundles to be withdrawn and cleaned manually (Fig. 1). “Since the heat recovery performance of an
HPSHE will not be reduced by fouling, extra process heat will not be required from the furnace,” says Palmeri. “This cuts fuel costs and reduces carbon dioxide emissions.” HPSHEs consume only a quarter of the
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