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Ensure accurate fermentor temperature control

Production yield is very dependent on accurate temperature control during the fermentation process. And keeping microorganisms at a precise temperature is crucial for a high production rate, with a minimum of unwanted by-products.

There are two ways of cooling the broth: Either by running cooling water through an internal loop in the fermentation tank, or by running the broth through an external heat exchanger where it is cooled off.

High yield and minimum contamination

The best broth cooling solution is an external, compact heat exchanger. With small hold-up volumes, heat exchangers provide very accurate temperature control, thereby maximizing production yield.

A compact heat exchanger can work with a ΔT as low as 2°C (3.6°F). In many cases, this means you can cool the broth using normal water instead of chilled water and save on both energy and investment costs.

Using an external heat exchanger instead of an internal cooling loop also makes tank cleaning easier, and minimizes the risk of contamination.

Alfa Laval heat exchangers are designed for compact performance and easy cleaning. Most often it is sufficient to use Cleaning-In-Place (CIP) equipment, which minimizes downtime and wear on gaskets and plates.

All Alfa Laval gasketed plate heat and spiral heat exchangers can be opened when necessary, giving maintenance personnel full access to all heat-transfer surfaces.

Fibrous media

When processing fibrous media it is important that the equipment does not clog up and cause costly downtime and cleaning.

Alfa Laval’s WideGap plate heat exchangers are designed for media with high fiber contents and coarse particles. The channels are much wider than a typical plate heat exchanger. And depending on the plate configuration, the plates have average gap widths of 5, 8, 11 or 17 mm (0.20, 0.31, 0.43 or 0.67 in). The specially designed, corrugated plates create a highly turbulent flow that helps reduce fouling and sedimentation. WideGaps are easy to service due to the design of the plates and frames. For example, the herring-bone pattern of the plates increases the cleaning effect during back flushing.

Our spiral heat exchangers excel at handling long fibers. The fluids flow through two concentric, spiraling channels in opposite directions. This design provides optimal flow conditions for a wide variety of fluids, ensures high heat transfer and keeps the overall size of the unit to a minimum. If fouling starts to build up, the pressure behind the deposit increases (due to the single-channel design), and when the pressure gets high enough the fouling is flushed out.

Each Alfa Laval heat exchanger is individually configured according to its specific operating conditions to optimize heat transfer, cleaning and operating costs.

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Alfa Laval WideGap heat exchangers are designed for handling fibrous media without clogging.
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The single-channel design of an Alfa Laval spiral heat exchanger means fouling is fl ushed away as the pressure starts building up behind the deposits, resulting in a self-cleaning effect.

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