Views: 0 Author: Site Editor Publish Time: 2026-03-31 Origin: Site
In dairy processing, heating fresh milk from 3°C to 75°C is a common duty in pasteurization and preheating lines. For this application, the plate heat exchanger is one of the most widely used solutions because it offers fast heat transfer, compact size, precise temperature control, and hygienic construction. FAO guidance describes plate heat exchangers as suitable for continuous milk heat treatment and notes advantages such as strict control, low processing cost, automatic cleaning, and small space requirement.
For fresh milk service, the plate heat exchanger is typically integrated into a continuous pasteurization skid. Cold raw milk enters the system at about 3°C, is first regenerated against already-heated pasteurized milk, then brought up to the final process temperature using steam on the heating side through a hot water section or a controlled steam-heated loop. In standard HTST milk pasteurization, milk is commonly heated to around 72°C for 15 seconds, and 75°C is often used as a practical project target or design margin depending on the process and control philosophy.
Milk is a sensitive product. The heating system must raise temperature quickly while preserving product quality and maintaining sanitary design. A plate heat exchanger is well suited for this because its corrugated plates create turbulent flow, which improves heat transfer and allows rapid temperature rise with relatively low product hold-up volume. Tetra Pak’s dairy processing guidance identifies plate heat exchangers as a core heat-transfer technology in dairy plants, and its equipment literature emphasizes gentle, energy-efficient heating optimized to maintain product quality.
Compared with bulk tank or jacketed heating, a plate heat exchanger offers several important advantages in milk processing:
rapid and uniform heat transfer
compact footprint
hygienic stainless steel construction
easy CIP cleaning
high heat recovery through regeneration sections
accurate control of pasteurization temperature
For heating fresh milk from 3°C to 75°C by steam, the system usually includes these sections:
Incoming cold milk is preheated by outgoing hot pasteurized milk. This greatly reduces steam consumption and improves overall energy efficiency.
Milk is then heated from the intermediate temperature up to the final pasteurization temperature. In dairy plants, steam is often used indirectly by heating a hot water loop, which then transfers heat to the milk through the plate heat exchanger. This avoids direct steam contact with the product and gives better temperature control. Dairy heat exchanger references describe indirect heating as the standard principle for many milk heating duties.
If the process is pasteurization, the milk is held at the required temperature for the specified time. FAO and FDA references describe continuous-flow milk pasteurization at about 72°C for 15 seconds as the standard HTST benchmark.
After holding, the milk is cooled in the regeneration section and then further cooled by chilled water or ice water, depending on downstream storage or packaging requirements.
Milk equipment must meet strict sanitary requirements. The plate heat exchanger should use food-grade materials, hygienic connections, and a design that supports complete drainage and effective CIP cleaning.
When heating milk to pasteurization temperature, stable control is essential. Temperature sensors, control valves, and flow diversion arrangements are typically used to ensure the milk reaches the required temperature before moving downstream. FAO maintenance guidance for pasteurization plants also emphasizes the importance of maintaining the target set temperature accurately.
One of the biggest advantages of a plate heat exchanger in milk pasteurization is regeneration. By recovering heat from pasteurized milk, the system can sharply reduce steam consumption compared with non-regenerative heating methods. FAO specifically highlights low processing cost and compact operation as key advantages of plate heat exchangers in dairy service.
Fast heating and short residence time help reduce thermal damage. This is important for preserving milk taste, nutritional quality, and process consistency.
The exchanger must be selected for the required milk flow rate and acceptable pressure losses on both product side and utility side. Oversizing or undersizing will affect both energy use and process stability.
A steam-heated plate heat exchanger for fresh milk can be used in:
milk pasteurization lines
dairy reception and preheating systems
yogurt milk preparation
cheese milk processing
cream and standardized milk heating
small and large dairy processing plants
A plate heat exchanger for heating fresh milk from 3°C to 75°C by steam is a proven solution in dairy processing. It combines hygienic design, high heat-transfer efficiency, compact construction, and excellent energy recovery. For pasteurization systems, it also supports the precise and continuous heating control needed to meet dairy processing requirements. Standard dairy references describe plate heat exchangers as a preferred option for continuous milk heat treatment, especially when strict control, low operating cost, and easy cleaning are important.
