Abstract:

 The increase of pipeline resistance of heat transfer oil heation system during dyeing and finishing process would lead to great temperature difference between import and export. Theoretical calculation and analysis about pressure drop, local resistance and frictional resistance of the heating syste was carried out taking an enterprise as an example. The results show that the total pressure loss of hot oil pipeline is1 980 kPa. The frictional resistance increased 278 kPa as the gel adhesive on the inner wall of the tubing, accounting for 14.05%. Therefore, the resistance of oil pipeline is mainly caused by heat conduction oil heating cycle system. When the designed temperature difference between oil import and export is 25 ℃ and  the oil speed is 2.38 m/s, the heat conduction oil colloids can increase the resistance loss of 575 kPa. It is suggest that the heat conduction oil pipe should be cleaned when it is in use more than one year.

Key words: haet transfer oil, thermokynamic cycle system, friction resistance, pressure drop