Search

In order to reduce the deposition of dust on the surface of the fin of the air cooler, the influencing factors of dust deposition were studied. Firstly, the airflow along the working face is observed, which provides variable reference and data support for the wing dust deposition experiment. Then, the dust collecting test platform was built to simulate the dust collecting on the air cooler fins. Finally, the key factors that affect the dust deposition on the fins are studied by controlling the variables. The results show that the condensate water plays an important role in the dust deposition of the air cooler fins in high temperature and high humidity environment. When the amount of condensed water is less, the condensed water is adhered to the surface of the fin, which has the effect of adhesion to the particles, thus speeding up the deposition of dust on the surface of the fin. When the amount of condensed water is large, the condensed water moves downward under the action of gravity and carries away the dust attached to the fin surface, thus slowing down or even reducing the deposition of dust on the fin surface.

In order to solve the problem of dust accumulation on the fin surface of a mine air cooler, a method of preparing super-hydrophobic polyurethane (SPU) coating based on waste cooking oil (WCO) was proposed. Firstly, the polyurethane prepolymer was synthesized with WCO as a raw material, and then the polyurethane prepolymer was modified with amino-terminated polydimethylsiloxane (ATP) to obtain SPU emulsion. The chemical structure and thermal stability of SPU were characterized by infrared spectrum and thermogravimetric analysis. A series of nanocomposites were prepared by combining modified silicon carbide (APT-SiC) particles and SPU emulsions. According to the parameters of pull-off strength, contact angle, sliding angle and thermal conductivity, the filler ratio of nanocomposites was optimized. The test results show that when the content of APT-SiC particles is 20 wt %, super-hydrophobic polyurethane coating can be obtained. The coating has good pull- off strength and thermal conductivity, and the contact angle and sliding angle are 161&deg, and 3&deg, respectively. In addition, the practical application of the super-hydrophobic polyurethane coating was tested by related experiments. The experimental results show that the coating has good self-cleaning, wear resistance and anti-corrosion performance, can meet the requirements of air coolers in special environments, and has great application prospects.