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Case Study
Replacing Three Plate Exchangers for Petrochemical Producer
The problem: replace three existing plate-type heat exchangers.
Details
Industry
Petrochemical
Lead Time
14 weeks post-design approval
Product
Plate heat exchanger
Applied Capabilities
3D modeling
Materials
304H stainless steel & MC* X 18.7 structural steel
Location
Montreal, Canada
Heat and Air Specifications
Drain pan under each unit with 4 – 2” S.S. drain connections.
Three high-pressure, high-temperature replacement heat exchangers on a 77,000 SCFM Catalytic incinerator.
Pre-heat personnel made several trips to this facility to discuss the replacement process, materials construction, and project timing as well as to obtain critical dimensions.
Pre-heat designed three special I-U flow pattern heat exchangers using cross-flow heat exchanger modules.
The clean air traveled through the I-pass of the exchanger, which was the inside of the membrane envelopes. The dirty air stream passed through the U-pass of the exchanger, which was on the outside of the membrane envelopes. This was done so that any liquids condensed out of the dirty air stream would collect in the drain pans at the bottom of the exchanger.
Also, the U-pass side of the exchanger could be cleaned, and any cleaning solution and particulate would exit the exchanger through the bottom drains located in the bottom shell of the exchangers. With this system, the exchangers could be cleaned in place, and the customer would not have to be concerned with the buildup of condensed liquid and particulate matter in the exchanger that could prematurely corroding the exchanger.
PRE-heat engineers developed a 3D model of the heat exchangers so the customer could put the heat exchanger model into his 3D drawing of the catalytic incinerator system to guarantee an exact replacement.
All three heat exchangers were built by PRE-heat, on schedule, and shipped to the plant for quick replacement during a 1 week planned shut down.
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