New vacuum drying equipment with variable pressure
new vacuum drying equipment with variable pressure introduction :
Transformer vacuum drying equipment is an ideal equipment for drying oil paper insulation power equipment with voltage of 220kV and 110kV and below, transformer of 500kV and below. Compared with the traditional hot air circulation drying, ordinary vacuum drying and low frequency drying equipment, the processing time is shortened by about 1 / 3, the energy consumption is reduced by 30% - 50%, and the moisture content of insulation material after treatment is the minimum 5 ppm. Its equipment investment is only 25% - 45% of that of kerosene vapor phase drying equipment.
new vacuum drying equipment with variable pressure working principle:
By means of vacuumizing, the saturated vapor pressure of water in the environment where the coil insulation material is located is increased to make it easier to volatilize from the insulating paper. During this period, it is heated continuously to increase the temperature, so as to ensure the gasification energy of water and make the water easier to discharge.
new vacuum drying equipment with variable pressure features:
Ordinary heating and drying starts from the surface, and gradually goes to the interior of the insulating material. Because the surface drying is too fast, the capillary tube of the outer insulating paper makes the internal water difficult to evaporate, thus prolonging the drying time. In the drying process, the pressure swing method exhausts gas intermittently, which makes the evaporated steam and hot air circulate together in the tank. Because the heat capacity of water is much larger than that of air, the heating speed is faster, and the diffusion of water vapor is strong, and the temperature difference inside and outside the insulation material is relatively small.
In addition, in order to shorten the drying time, the heating temperature is often set at a high level, which makes the insulation paper on the coil surface brittle, resulting in product quality problems. The heat source temperature of pressure swing drying equipment will not exceed 115-120 ° C, and the core temperature should be controlled at "80 ° C", so it is impossible for the dried products to have the above problems.