Reducing Costs for a Powdered Egg Producer

As this was an existing process, the heat exchanger had to:

• Be easy to clean and inspect.
• Allow condensate to drain easily to prevent mold growth.
• Be sized so the total pressure drop across the unit did not exceed 6”. This would allow the customer to use the existing process air fan, reducing the overall cost of the project.

The heat exchanger was an all-welded plate-type unit, with a 304 stainless steel core and shell. To help with cleaning and inspection, the heat transfer plates were designed with an inline dimple pattern and ½” plate spacing, which would allow operators to see any material buildup and easily remove it. Marriott Walker installed the heat exchanger so the exhaust moved vertically down through the heat exchanger which helps reduce fouling and allows condensation to easily drain to a collection point in the duct below.

As a result, the heat exchanger is saving the operator an average of 10% on fuel costs, or $133,056 in the first year. There has also been no problem with dust buildup on the plates. Cleaning the plates occurs every three months using a high-pressure hose and has been incorporated into the planned maintenance schedule.