Justification of energy saving in the drying section during the modernization of circulating greasing of bearings

The purpose of the work is to substantiate the use of a less energy-consuming circulating lubrication system consisting of two options for installing rotameter blocks. Compact (rotameters are installed in one block on the front and drive side of the drying section) and distributed (four rotameter blocks are installed on the front and drive side of the drying part). To achieve this goal, the following tasks were solved: measurement and analysis of the temperature of the operating compact system of circulating lubrication of drying cylinders and grid-carrying shafts of the drying section; calculation of the length of pipes of small internal diameter dv = 8 mm of oil supply from the rotameters to the bearings of drying cylinders and grid-carrying shafts of the operating (compact) and grouped drying part of rotameter installations; determination of the loss of the amount of heat carried out by the circulating oil from the zone of the heat-insulating hood of the drying part with a compact and distributed in groups of the drying part of rotameter installations. Experimental studies have established that the oil temperature in the pipes, with a compact installation of rotameters, increases in the area from the entrance to the zone of the heat-insulating hood of the drying part to the entrance to the bearing supports of the drying cylinders and cloth shafts by 27...29 C and reaches an average of 67 C. The estimated length of the oil supply pipes to the bearing supports when the rotameters are located in front of the drying groups is shorter than the same length of pipes with a compact arrangement of rotameters by 1501.52 m. Reducing the length of pipes in the zone of the heat-insulating hood of the drying part, with a steady operating mode, significantly reduces the heating of oil and the removal of thermal energy from the drying zone of the paper web. The calculation of the reduction in the amount of heat carried out from the boiler part when the rotameters are arranged in groups in comparison with the compact arrangement is performed. It was found that during an hour of operation of the drying part, the amount of heat carried out by heated oil is reduced by 74844 kJ.

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