Heat exchangers for the food industry
What are heat exchangers used in the food industry?
A: Heat exchangers for the food industry (also known as sanitary heat exchangers) are heat exchange devices specifically designed for food processing scenarios. Their core function is to achieve efficient heat transfer between food materials and heat transfer media (such as steam and cooling water) while strictly ensuring food hygiene and safety.Its core difference from ordinary industrial heat exchangers lies in the fact that it adheres to food-grade standards in everything from material selection and structural design to manufacturing processes. For example, parts in contact with materials are mostly made of food-grade materials such as 316L stainless steel, and the surface undergoes electrolytic polishing treatment (roughness Ra≤0.8μm), eliminating any unsanitary dead corners.It meets international and domestic food contact safety certification requirements such as FDA, EHEDG, and GB 4806.9-2016. Common types include plate heat exchangers, shell and tube heat exchangers, scraped plate heat exchangers, and wide-channel plate heat exchangers, suitable for food liquid heat exchange scenarios with a design pressure not exceeding 1.2MPa and a design temperature not exceeding 200℃.
What are the core product features of heat exchangers used in the food industry?
Extreme hygiene:The parts in contact with materials are made of corrosion-resistant and non-toxic materials such as 316L stainless steel, and the seals are made of food-grade elastomers (such as EPDM and silicone), which meet the hygiene standards for food-grade rubber gaskets.1. The structure is designed with no dead corners and the flow channels are smooth, supporting in-line cleaning (CIP) and in-line sterilization (SIP). Some equipment can achieve 121℃ steam sterilization, with a cleaning coverage rate of 100%, effectively inhibiting the growth of microorganisms and material residues.
High heat exchange efficiency:It adopts counter-current heat exchange and corrugated plate to enhance turbulence design, resulting in high heat transfer efficiency. For example, the heat transfer coefficient of the plate heat exchanger is not less than 2326 W/(m²·K), which is 3-5 times that of the traditional shell and tube heat exchanger.Some equipment features efficient heat recovery, which can utilize the waste heat of high-temperature materials to preheat cold materials, significantly reducing energy consumption.
A: The core function is to achieve precise calorie control while adapting to the special processing requirements of food. Specific functions include:
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1. Basic heat exchange function
to heat or cool materials, such as cooling freshly squeezed juice from 30-40℃ to 5-10℃ to inhibit oxidation, heating syrup to 60-70℃ to improve dilution efficiency, and cooling refined edible oil to room temperature for easy storage.
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2.Sterilization and preservation function
It can be matched with food sterilization processes to achieve pasteurization (e.g., milk at 72℃/15 seconds) and ultra-high temperature instantaneous sterilization (UHT, e.g., milk at 135-150℃).While killing harmful bacteria, it minimizes the loss of nutrients and the destruction of flavor. For example, ultra-high temperature treatment of soy sauce at 140℃ for 3 seconds can reduce the loss of amino acid nitrogen by 60%.
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3. Concentration and quality improvement function:
The evaporation system is used to concentrate the material. During the juice concentration process, the latent heat of steam is recovered through heat exchange, which reduces energy consumption while ensuring that the vitamin C retention rate is over 90%.By simulating traditional aging processes, such as vinegar aging, the aging period can be shortened to 30 days, while retaining over 85% of the flavor components.
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4. Energy-saving and safety protection functions
The heat recovery technology captures the heat of the outflowing fluid to preheat the feed, significantly reducing energy consumption; the dual tube sheet and sealed isolation design prevent cross-contamination between materials and heat transfer medium, ensuring food hygiene and safety.The dual-tube sheet and sealed isolation design prevent cross-contamination between materials and heat transfer media, ensuring food hygiene and safety.Some smart models have a leakage warning function, which can provide early warning of faults up to 30 days in advance, reducing the rate of unplanned downtime.
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