Air Radiator Overhaul Frequently Asked Questions

Air Radiator Overhaul Frequently Asked Questions

Industrial drying equipment heat exchanger is widely used in wood drying, chemical drying, food drying, paper drying, Chinese herbal medicine drying, fruits and vegetables, seafood and other drying and large space workshop, greenhouse heating and workshop weaving and printing and dyeing industry air humidification.

Air heat exchanger in the drying, heating and cooling, drying and other industries is very widely used, and clogging, leakage and poor heat transfer effect is the user friends often encounter problems.

1. Scaling and clogging

In long-term use, due to the use of different environments, there are different cases of scaling, there are so many factors affecting:

Fluid flow rate

 Flow rate for the impact of fouling should be considered at the same time its impact on the deposition of fouling and fouling stripping, for all types of fouling, due to increased flow rate caused by the increase in the rate of stripping of fouling deposition rate is more significant, so the growth rate of fouling with the increase in flow rate and reduce.

Temperature of heat transfer wall

 Temperature for chemical reaction scaling and salt precipitation crystallisation scaling has an important role, the increase in fluid temperature generally leads to the chemical reaction rate and crystallisation rate increases, thereby affecting the amount of dirt deposition, resulting in higher rates of dirt growth.

Heat transfer surface material and surface quality

 In terms of commonly used carbon pipe and stainless steel, carbon steel is more susceptible to corrosion, which leads to scaling and rusting, so choosing a material with better corrosion resistance can reduce the generation of fouling. The surface of the material will also affect the production of dirt, the greater the degree of surface roughness, the more likely to scale, so the choice of material use is very important.

2. Leakage

  The main reasons: welding process is not up to standard, corrosion, material defects and use a long cycle.

  Treatment: for ordinary leakage welding, patch welding or plugging; serious need to promptly replace the heat pipe and the entire heat exchanger.

3. Poor heat transfer

  Main reasons: finned tube wall scaling, bending blockage, fin deformation and serious ash accumulation and fan failure.

  Treatment: regular blowing or cleaning of the heat exchanger, inspection and repair of damage to the fins and detect whether the fan failure and overhaul.

  Case study: a coating plant hot air system using thermal oil finned tube heat exchanger, due to long-term maintenance and cleaning, the finned tube oil blockage is serious, the heat transfer effect is poor.

  Strategy: Replace the clogged air heat exchanger and purchase additional spare air heat exchanger.

  Estimated effect: Ensure smooth operation of the production line, good heat exchange effect, short maintenance cycle, high efficiency and low cost.

Vrcoolertech designs and produces air radiators for painting plants: