Why do sugar factories use heat exchanger tubes?

The rigid demand for temperature control in sugar production process
Sugarcane juice clarification and sterilization
Heating promotes flocculation: Steam (80-95℃) is introduced through the heat exchanger tube to accelerate the coagulation of impurities such as colloids and proteins in the sugarcane juice and improve the clarification efficiency.
Pasteurization: High temperature (70-85℃) treatment kills microorganisms to avoid corruption in the subsequent crystallization stage.
Multi-effect evaporation concentration
Steam heat transfer: The heat exchanger tube transfers the heat of high-pressure steam (120-140℃) to the sugar juice, causing it to boil under reduced pressure to achieve water evaporation (single-effect evaporation consumes 1.1-1.3 tons of steam/ton of water, and multi-effect evaporation can be reduced to 0.2-0.4 tons).
Temperature gradient design: Through the countercurrent arrangement of the tube side and the shell side, the heat exchange efficiency is maximized and energy consumption is reduced.
Crystallization and separation
Cooling-induced crystallization: cold water (20-30℃) or refrigerant is passed through the heat exchanger tube to reduce the syrup temperature from 70℃ to below 40℃, which promotes the precipitation of sucrose crystals.
Recycling of mother liquor: The temperature of the mother liquor is controlled by the heat exchanger to optimize the sugar recovery rate (crystallization efficiency is increased by 15-20%).

2. Technical advantages of heat exchanger tubes are adapted to the sugar-making environment
Selection of corrosion-resistant materials
Stainless steel tubes (such as 316L): Resistant to acidity of sugar juice (pH 5.5-6.5) and chloride ion corrosion, avoiding iron pollution affecting the quality of sugar products.
Titanium alloy tubes: In the sulfite clarification process, it resists the strong corrosion of SO₂ gas and extends the service life by 3-5 times.
Anti-scaling and easy-to-clean design
Smooth inner wall structure: Reduce the adhesion of sucrose scale (mainly CaCO₃ and organic matter) and reduce thermal resistance (scaling of 1mm can cause a 40% decrease in heat transfer efficiency).
Removable tube bundle: supports online chemical cleaning (such as NaOH solution circulation) or mechanical brushing to maintain stable heat exchange efficiency.
Compact and efficient heat exchange structure
Spiral wound tube: increases turbulence, improves heat transfer coefficient by 30-50% (compared to straight tube), and reduces equipment volume.
Double tube pass design: adapts to the high viscosity characteristics of sugar juice (50-100mPa・s) to avoid precipitation caused by too low flow rate.