Patent Application
20190257461
The device relates to nuclear power, in particular to the electrical equipment of a reactor facility with a Water-Water Energetic Reactor (RF with WWER). In general, the bath electrical heating device for deactivation designed to provide heating of bath deactivation and the deactivating solution in it before deactivation of RF equipment and ensuring the removal of excess heat in the process of deactivation of RF equipment.
The known technical solution (RF Patent No. 2219425, IPC F 16 L 59/06, priority Sep. 20, 2002) applies pipeline shields attenuating the heat transferring radiation.
The drawbacks of such structure are as follows:
complexity of arranging a large number of enclosed air cavities;
absence of electric heating elements;
complexity of structure installation and repair;
impossibility to withdraw excessive heat.
The closest to the technical essence is the device (Patent “Pipeline Heater”, utility model 38214 U1 F16L53/00, application: 2003128914/20, Sep. 29, 2003, published on May 27, 2004), which contains placed on the outer surface of the pipeline, blocks in the form of sections filled with heat-insulating material, on the inner wall of which there is an electric heating element with current leads, wherein the electrical heating element is made of a wire of high specific electric resistance, provided with insulating elements.
The drawbacks of the known structure, taken as prototype, are as follows:
large material consumption for the structure;
danger of short-circuiting of heater to the ground in case of spillage of deactivating solution; complexity (impossibility) of deactivation of heat insulation in case of spillage of deactivating solution;
impossibility to withdraw excessive heat.
These drawbacks are due to the fact that hygroscopic materials are used as heat insulation,
ceramic insulators are used as electrical insulation of the heater, and in addition, the construction does not ensure the removal of excess heat in the process of decontamination of RF equipment.
The said drawbacks are eliminated by the claimed structure.
The object of the invention is to provide a creation of bath electrical heating device for deactivation of RF equipment, technological parameters and safety of maintenance personnel in the process of deactivation of RF equipment.
The technical effect of this invention is to improve reliability, reduce the material consumption of the device and simplification of structure installation and repair. Another technical result is to ensure that the device can be deactivated.
The technical result is achieved by the fact that in the bath electrical heating device for deactivation of vertical execution, that contained a heater located on the outer surface of the pipeline from a wire with high electric resistance with current leads and couplings and heat insulation in the form of blocks, the device is proposed to perform at least from three heat insulation blocks in the form of coaxial metal screens, installed with an air gap from the heater, the heater with current leads must be made in hermetic perform, each heat insulation blocks supplemented with an air-gap coaxial metal protective casing, the air gap of which in the upper part is covered with a cap with a visor whose diameter exceeds the external diameter of the protective casing, wherein solid cover of the upper protective casing install a sealed coupling, in addition, in the upper and lower part of the side surface of the protective casing make through holes, the total area of which should be equal to or more than the area of the air gap between the outer screen and protective casing.
The concept of the invention is explained by the drawing.
The installation of the device begins with the installation of the heater 2, then the internal screens 4 heat insulation blocks 3, perform electrical installation and install an external protective casing 8. In preparation for operation heater 2 and heat insulation blocks 3 provide the initial heating of deactivating solution and bath for deactivation 1. By choosing he number of screens 4 and size of air gap 5 required surface temperature of heat insulation block 3 is reached. Perform the heater 2, current lead 6 and the coupling 11 in hermetic execution eliminates the possibility of a short circuit with possible leaks of the deactivating solution. Since the outer diameter of visor 9 exceeds the outer diameter of the protective casing 8, it is also excluded that the deactivation solution can enter the interior of the device. In the process of deactivation RF equipment excess heat is removed from the bath for deactivation 1 through the openings 12 due to air circulation between the heat insulation unit 3 and protective casing 8. By selecting size of air gap 7 temperature reduction of protective casing 8 is achieved to ensure the safety of maintenance personnel in the process of deactivation of RF equipment. All materials used in the device allow deactivation in case of spillage of deactivating solution.
Thus, use of the claimed technical solution in comparison with known devices provides increased reliability of the device: reduced material consumption, simplified installation and repair of the device, provided, if necessary, the possibility of device deactivation, initial heating of the equipment is provided by the attenuation of radiant heat exchange by the screens, provided in deactivation process removal of excess heat due to circulation of air between the heat insulation block and protective casing.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016142508 | Oct 2016 | RU | national |
This application is a US 371 Application from PCT/RU2017/000797 filed Oct. 27, 2017, which claims priority to Russia Application 2016142508 filed Oct. 28, 2016, the technical disclosures of which are hereby incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/RU2017/000797 | 10/27/2017 | WO | 00 |
