Justification of Energy Conservation in the Drying Part During the Modernization of Circulation Bearing Lubrication

Abstract

The purpose of this work was to justify the application of a less energy-intensive circulation lubrication system from two options for the installation of rotameter blocks: compact (with one block of rotameters installed on the front and drive sides of the drying section) and distributed (with four blocks of rotameters installed on the front and drive sides of the drying section). To achieve this goal, the following tasks were addressed: measuring and analyzing the temperature of the operating compact circulation lubrication system of the drying cylinders and fabric-leading rolls in the drying section; calculating the length of small diameter tubes with an internal diameter of d<inf>in</inf> = 8 mm for oil supply from the rotameters to the bearings of the drying cylinders and fabric-leading rolls for both the operating (compact) and group-distributed installations of rotameters in the drying section; determining the heat loss carried away by the circulating oil from the zone of the thermal insulation hood of the drying section during the operation of both the compact and group-distributed installations of rotameters. Experimental studies have shown that the temperature of the oil in the tubes with the compact installation of the rotameters increases by 27 to 29°C from the entry into the thermal insulation hood zone of the drying section to the entry into the bearing supports of the drying cylinders and fabric-leading rolls, reaching an average of 67°C. The calculated length of the oil supply tubes to the bearing supports when the rotameters are positioned before the drying groups is shorter than the corresponding tube length in the compact arrangement of the rotameters by 1501.52 m. Reducing the length of the tubes in the thermal insulation hood zone of the drying section under the established operating conditions significantly reduces the heating of the oil and the transfer of thermal energy from the paper drying zone. A calculation was performed to determine the reduction in the amount of heat carried away from the drying section when the rotameters are arranged in groups compared to the compact arrangement. It was established that over 1 h of operation of the drying section, the amount of heat carried away by the heated oil decreases by 74 844 kJ. © Pleiades Publishing, Ltd. 2024.