Kerosene Vapor Phase Drying Equipment VPD

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Kerosene Vapor Phase Drying Equipment VPD
  • 30DAYS
  • 100SETS/YEAR

Kerosene vapor phase drying equipment (VPD) is mainly used for drying the body of 110kv and above high pressure, high capacity transtormers and other equipments.

How it works:

The basic principle of kerosene vapor is : kerosene evaporated under vacuum with heating, become a high temperature kerosene vapor, in the vacuum tank encountered lower temperature condensate,release latent heat of condensation (about 306.6kj/kg) to heat the product. Condensational kerosene is collected and redelivery by kerosene delivery system to the evaporator again, heating and evaporation,cycle several times,workpiece temperature continues to rise, whose moisture also continue to evaporate into water vapor, pumped out by vacuum system, and ultimately achieve complete drying purpose.

Kerosene vapor phase drying equipment technology:

1. Preparation stage:

Place the product in a vacuum tank evacuated to the pressure down to 700pa or less. At the same time, the vacuum tank body heats the heat preservation evaporator to preheat the kerosene so that the outlet temperature of the kerosene of the evaporator gradually increases from 98℃ to 130℃. The kerosene diffuses from the liquid state into the vapor state and is fully exchanged with the product.

2. Heating stage:
In this stage, only one holding pump is needed in the vacuum system. The vacuum tank and condensate collecting tank is maintained at a technology predetermined degree of vacuum. Kerosene vapor have a heat exchange on the transformer and flow back to the butter tank after condensation, then return to the evaporator to form a cycle. As the temperature continues to rise, kerosene vapor, water vapor evaporated in the insulating material so that the pressure in the vacuum tank gradually increased, at this time, the above mentioned mixed gas is pumped to the condensation recovery system by the maintenance pump to be condensed and separated. The separated condensate kerosene liquid then enter the evaporator, the above process continues until the body temperature down to process requirements,then enter the stage of depressurization.

3. Depressurization stage ( or low vacuum stage ):

Kerosene stop delivery to the evaporator,continuously pumped the mixed gas out of the vacuum tank. The kerosene remaining in the insulating material is evaporated again for condensation recovery. According to different capacities and voltage levels, the intermediate pressure reduction stage and the heat stage can be alternated several times in order to achieve the best drying result.

4. High vacuum stage:

Start main vacuum system for vacuum tank. The final pressure becomes 10Pa or less. When the body temperature reaches the predetermined temperature, the insulating material yield reaches less than 19g per ton per hour, the drying process ends.

5. Process Characteristics:

Kerosene steam as the heat carrier medium can be conducted in a vacuum state convection heat transfer and condensation heat relcase, the lower the temperature the more intense the condensation place,i.e., the larger the heat release,therefore the body temperature is uniform.

Kerosene vapor not only heat the insulating material by heat exchange,but also carry on exothermic phase transition condensate in the insulating material surface. Then, the condensed kerosene have a heat exchange in the insulating film surface. Heat transfer efficiency is higher than any other heating methods, so the heating rate is fast .

The kerosene after completion of the heating can evaporate quickly,without affecting the diffusion coefficient of the high vacuum stage of the moisture within the material.

Heating is carried out under anaerobic conditions in a vacuum, so that the heating temperature may be increased from 0℃ to 130℃ without causing the aging of the insulation material, in which case water vapor partial pressure is increased to about 98000Pa,moisture inside the insulating material the diffusion coefficient increases, the water evaporates much faster.While the entire drying process,the body has been in the vacuum state, the water throughout the course of the drying cycle. Therefore, kerosene vapor phase drying can maximize high efficiency and energy saving demand.

Condensed kerosene easily penetrate into the surface and inside the insulating material, the insulating material itself accelerated thermal conductivity, and the insulating material deep temperature distribute uniformly.

Condensation of kerosene as a good cleaning solvents, can wash off dirt on the transrormer, it is the unique feature of kerosene vapor drying. This feature is also the main reason that kerosene vapor is particularly suitable for treatment of the repair transformers,the transformer body surface is clean and no grease and stains. 

6. System components:

1. vacuum drying tank system: 1 set

2. vacuum system: 1 set

3. condensing system: 1 set

4. kerosene evaporation distillation system: 1 set

5. kerosene storage conveyor system: 1 set

6. heating system: 1 set

7. hydraulic system: 1 set

8. pneumatic system: 1 set

9. cooling water piping system: 1 set

10. control system: 1 set

11. explosion-proof ventilation system: 1 set

12. spare parts: 1 set

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