Optimize the selection and structural design of heat exchange equipment

Select efficient heat exchange materials: prioritize using materials with high thermal conductivity (such as titanium alloy, 316L stainless steel) to make heat exchange tubes, reducing tube wall thermal resistance; For materials that are prone to scaling, polished heat exchange tubes or wear-resistant and anti scaling coated tubes can be chosen to reduce the probability of dirt adhesion.

Increase effective heat transfer area: When the equipment space allows, choose special-shaped heat transfer tubes such as threaded tubes and corrugated tubes. Compared with smooth tubes, they can increase the degree of material turbulence and improve the heat transfer coefficient; It is also possible to expand the actual heat transfer area by increasing the number of heat exchange tubes and adopting a combination structure of tube and plate heat exchangers.

Optimize material distribution design: Install material distributors or deflectors to ensure uniform coverage of the heat exchange surface, avoid local "dry wall" or "liquid accumulation" phenomena, and improve thermal energy utilization efficiency.

Strengthen daily operation and maintenance, remove heat exchange resistance

For mild scaling, online chemical cleaning (such as cyclic flushing with citric acid or weak acid solution) is used without stopping the machine;

For severe scaling, perform physical cleaning (such as high-pressure water jet, mechanical scraping) after shutdown to thoroughly remove the scale layer and impurities on the inner wall of the heat exchange tube.

Regular cleaning and descaling: Based on the scaling characteristics of the material, establish a cleaning cycle:

Timely maintenance of seals and components: Regularly inspect the seals of the heat exchanger to prevent leakage of cold and hot media from causing a decrease in heat transfer efficiency; Maintain auxiliary equipment such as vacuum pumps and circulation pumps to ensure stable system vacuum and avoid pressure fluctuations affecting material boiling state.

Optimize process operating parameters

Control material viscosity and concentration: For high viscosity and high concentration materials, preheating and dilution can be used before feeding to reduce flow resistance and improve the contact efficiency between the material and the heat exchange surface; Mixing devices can also be installed inside the evaporation tank to enhance material turbulence and reduce boundary layer thermal resistance.

Matching stable heat sources and cooling conditions: ensuring the temperature and flow rate of the heating medium (steam, hot water) are stable, avoiding fluctuations in heat transfer efficiency caused by insufficient heat sources; Simultaneously optimize the temperature and flow rate of the condenser cooling water to ensure rapid condensation of secondary steam, maintain stable negative pressure in the system, and indirectly improve heat transfer efficiency.

Reasonably adjust the feed rate: Control the feed rate according to the rated processing capacity of the equipment to avoid overloading or no-load of the heat exchange surface; Synchronize the discharge rate to maintain a stable liquid level of the material in the evaporation tank, ensuring that the heat exchange surface is always fully covered by the material.