KR100953506B1 - A removal apparatus of residual pcbs by chemical cleaning and vacuum treatment of oil immersed transformer - Google Patents

Abstract

PURPOSE: A device for processing the residual PCB(Poly Chlorinated Biphenyls) of an oil immersed transformer is provided to reduce costs using the oil immersed transformer as a decompression heating tank or cleaning tank. CONSTITUTION: A pump(17) injects a cleaning agent into a transformer. An electric insulating oil containing PCB is discharged from the transformer through an outlet. An electric insulating oil condenser condenses the electric insulating oil containing the PCB. An electric insulating oil collection tank(20) collects the electric insulating oil containing the PCB which remains in an evaporator. An electric insulating oil tank stores the electric insulating oil containing PCB transferred from a transformer chamber or insulating oil collection tank. A cleaning agent collecting tank collects the cleaning agent which remains in a cleaning agent condenser. A cleaning agent tank(16) stores the cleaning agent transferred from a cleaning agent collection tank.

Description

     Treatment device for power equipment for PCBs contamination by cleaning and vacuum heating {A Removal Apparatus of Residual PCBs by Chemical Cleaning and Vacuum Treatment of Oil Immersed Transformer}

The present invention relates to an apparatus for processing power equipment for PCBs contamination by cleaning and reduced pressure heating. More particularly, the present invention relates to an inlet power equipment such as a columnar transformer and a large transformer by using a cleaning process and a reduced pressure heating process. The present invention relates to a device for simultaneously removing residual PCBs and insulating oil.

     Since PCBs have good fluidity, electrical insulation, heat conductivity, and flame retardancy, they have been used in electrical insulating oils of inflowing power equipment since 1970, but since late 1970s, they have been identified as environmental hormone substances and are currently designated as "designated waste" by the Ministry of Environment. And “residual organic pollutants”, when disposing of inflow power equipment contaminated above the legal level, the PCBs should be removed and kept below the regulatory level before disposal.

      "Inflow Power Equipment" refers to transformers, inlet breakers, shunt reactors, potential transformers, discharge coils, neutral ground reactors, series reactors, capacitors and capacitors used for boosting and decompressing power transmission and distribution. The transformer consists of about 70% of the solid materials such as case, silicon steel core, copper winding, wood, insulating paper, and insulating plate, and about 30% of the liquid insulating material which is electric insulating oil. It is composed of degree.

       In general, the reason for injecting the electric insulating oil into the inflowing power equipment is to facilitate the cooling of the equipment as well as the surrounding materials and insulation, and to increase the thermal conductivity. Even if electrical insulating oil is oiled, a large amount of PCBs and electrical insulating oil remain inside the inflow power equipment.

      Conventional technology related to the apparatus for processing harmless inflow power equipment contaminated with PCBs is to remove or remove PCBs by dismantling or cutting the inner member of inflow power equipment contaminated with PCBs and putting the cleaning solution together in the cleaning treatment tank. There is a treatment method and a reduced pressure heating method for dismantling or cutting the inner member of the inflow power equipment, putting it in a reduced pressure heating tank and heating under reduced pressure to remove and remove PCBs by evaporation.

      In other words, the conventional technology is to remove PCBs contaminated by the inflow power equipment by selecting only one of the pressure reduction heating treatment or the cleaning treatment method, and a separate pressure reduction heating tank and the cleaning treatment tank should be manufactured and installed. As a related art, there are no published documents or patents, and a paper on a decompression heating apparatus has been published in Clean Technology 2005. Fall, "Residual Organic Pollutant PCBs Decomposition and Treatment Technology", Japan Electronics September 2008. , "Overview of Transformer Recycling Center (PCB Processing)".

    However, in the case of the cleaning treatment process, the case and the inner member of the inflow power equipment must be cleaned by using different devices, and the shredded inner members remain by using the high pressure nozzle solvent spray conveyor device or the cleaning treatment device according to the type. One PCBs and electrical insulating oil should be cleaned and removed, and the PCBs and electrical insulating oil impregnated with insulating paper or wood had difficulty in removing. In addition, in the case of decompression heating process, the decompression heating tank is manufactured separately, and the inflow power equipment is dismantled or cut and put into the decompression heating tank. Therefore, the cost of dismantling cutting and the decompression heating tank are expensive. The process takes about 24 hours, and it has a disadvantage of generating more waste than the used electrical insulating oil because it uses a new electrical insulating oil when absorbing and removing vaporized PCBs and electrical insulating oil in a reduced pressure heating tank.

      The present invention is to solve the above-mentioned problems of the prior art, inflowing PCBs and electrical insulating oil without dismantling or cutting the inner member of the inlet power equipment, and without making and installing a separate pressure reducing heating tank or cleaning treatment tank It can be easily removed from the electric power equipment, and it is a device that can use the case of the incoming electric power equipment at the same time as the pressure reduction heating tank and the cleaning treatment tank.

Accordingly, the present invention is to provide an apparatus capable of efficiently and economically treating a large number of inflow power devices contaminated with PCBs regardless of the size and number of inflow power devices that harm the PCBs.

In order to reduce the amount of waste contaminated with PCBs, the present invention decontaminates vaporized PCBs and electrical insulating oil by primary condensation and removes the remaining amount of PCBs by the second amount of mists. It absorbs PCBs and electrical insulating oils by using a cleaner that has low evaporation temperature and specific heat, so that the electrical insulating oil contaminated with the cleaning agent and PCBs is evaporated and separated. It is to provide an apparatus for treating power equipment for PCBs contamination inflow by cleaning and decompression heating, in which a smaller amount of waste is generated by recovering insulating oil than in the prior art.

      The present invention has the following various effects as compared to the prior art.

     First, the equipment is not only simple but also manufactured by removing the remaining PCBs and electrical insulating oil at the same time by using the incoming power equipment as the reduced pressure heating tank or the cleaning treatment tank without making and installing a separate pressure reducing heating tank or the cleaning treatment tank. Not expensive

     Second, PCBs can be easily removed without dismantling or cutting inflow power equipment that is difficult to transport, such as large transformers contaminated with PCBs, and transporting them in the place where the equipment is installed.

     Third, since the cleaning process is performed under the reduced pressure of the inflow power equipment, the cleaning agent can penetrate into the gap between the winding and the iron core, and the cleaning liquid is discharged under the reduced pressure, so that the PCBs and electrical insulating oil remaining in the gap can be removed quickly. As a result, the removal efficiency is improved and energy costs are saved.

      In the processing apparatus for separating the mixed solution of the PCBs and the electrical insulating oil remaining in the transformer (3), which is an inflow power equipment by vaporization and condensation by cleaning and reduced pressure heating,

      A transformer chamber (1) in which the transformer (3) is mounted so as to perform cleaning treatment or reduced pressure heating treatment;

      A transformer header 6 which connects a pump 17 capable of injecting a cleaner into the transformer 3 and a vacuum pump 18 capable of reducing pressure;

      A suction / discharge port (4) (5) capable of discharging the electric insulating oil containing PCBs from the transformer (3), or suctioning or discharging liquid or gaseous substances such as cleaning agents;

       A heater (2) mounted outside the transformer (3) for heating;

      An electric insulating oil condenser (7) for cooling and condensing the electric insulating oil containing PCBs generated during the reduced pressure heating process of the transformer (3);

      An absorption tower (8) for cleaning and absorbing the PCBs-containing electrical insulating oil remaining without condensation in the electrical insulating oil condenser (7);

     An evaporator (9) for evaporating PCBs-containing electrical insulating oil and cleaning agent transferred from the transformer chamber (1) and the absorption tower (8);

     A cleaner condenser (10) for cooling the vapor phase cleaner delivered from the evaporator (9);

     An electric insulating oil recovery tank (20) for recovering the electric insulating oil containing PCBs remaining in the evaporator (9);

     An electrical insulating oil tank (22) for storing the electrical insulating oil containing PCBs transferred from the transformer chamber (1) or the insulating oil recovery tank (20);

     A cleaner recovery tank (11) for recovering the cleaner remaining in the cleaner condenser (10);

    A droplet separator (12) for separating the detergent mist remaining in the air conveyed from the detergent condenser (10);

    A droplet separator (13) for separating the detergent mist remaining in the air conveyed from the electric insulating oil condenser (7);

    An air pollution prevention device (14) for preventing a small amount of cleaning agent contained in the air conveyed from the droplet separator (13);

    An air pollution monitoring device (15) for monitoring the air transferred from the air pollution prevention device (14);

     It consists of a detergent tank 16 for storing the detergent conveyed from the detergent recovery tank (11).

     The transformer 3 uses its own case as a cleaning tank and a decompression tank, so it is not necessary to separately manufacture these tanks.

     The transformer 3 is characterized in that the inner member is not dismantled or cut.

     The transformer 3 is characterized in that provided with at least one.

     The cleaning agent may be used in combination with a liquid phase or a vapor phase.

     The present invention configured as described above will be described in detail with reference to the accompanying drawings.

    1 is a schematic diagram of a treatment apparatus of a power device for PCBs contamination inflow by cleaning and decompression heating, showing the overall configuration according to an embodiment of the present invention, in which a transformer chamber ( After the transformer (3) and the transformer header (6) were connected and installed in 1), the PCBs and the electric insulating oil were removed according to the following process. Hereinafter will be described in detail with reference to the accompanying drawings.

1. Transformer oil repelling process [Fig. 2]
1.1 The transformer 3 is connected to the transformer chamber 1, and the electrical insulating oil contaminated with the PCBs inside the transformer is pumped into the electrical insulating oil tank 22 by pumping the pump 23.

2. Decompression process [Fig. 3]
2.1 When oil repellent of electric insulating oil is completed in the oil repelling process. The vacuum pump 18 is operated to discharge the air inside the transformer 3. This process completely removes the air present between the insulating paper, the copper winding, and the steel core of the transformer 3 to increase the cleaning efficiency of the cleaning agent. A depressurization step is performed.
2. 2 At this time, the air passes sequentially through the electric insulating oil condenser (7), absorption tower (8), evaporator (9), detergent condenser (10) and droplet separator (12), and then air pollution preventer (14) and air pollution The supervisor 15 is finally released to the atmosphere.

3. Cleaning process [Fig. 4]
3.1 When the inside of the transformer 3 reaches a vacuum, the cleaning tank is injected into the transformer 3 through the intake port 4 above the transformer 3 using the pump 17 in the cleaning tank 16, and the transformer ( 3) Discharge through the upper outlet (5).
3.2 The mixed solution of the cleaning agent discharged from the transformer (3) and the electrical insulating oil containing PCBs passes through the electrical insulating oil condenser (7) and the absorption tower (8), and is separated from the evaporator (9) so that the cleaning agent is removed from the cleaning condenser (9). It is condensed and stored in the detergent recovery tank 11 and recovered to the detergent tank 16 using the pump 19.
3.3 The electrical insulating oil containing PCBs remaining in the evaporator 9 is stored in the electrical insulating oil recovery tank 20 and then transferred to the electrical insulating oil tank 22 using the pump 21.
3.4 This process is continuously circulated until the concentration of PCBs in the cleaning liquid exiting the outlet 5 on the top of the transformer 3 is less than 3 ppb, and the detergent recovered to the cleaning tank 16 is reused.

4. Cleaner discharge process [Fig. 5]
4.1 When the cleaning process is completed, the pump 23 is operated to discharge the cleaning agent inside the transformer 3, and the cleaning agent discharged from the transformer 3 is evaporated in the evaporator 9 and condensed in the cleaning condenser 10. Stored in the detergent recovery tank 11, the pump 19 is operated to be recovered to the detergent tank 16.

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5. Decompression heating process [Fig. 6]
5.1 A pressure-reducing heating process for the inside of the transformer (3) is carried out to completely remove the remaining detergent after discharging the inside of the transformer (3) and the electrical insulation oil containing a small amount of PCBs remaining between the copper winding or the steel core during the cleaning process. Do as follows.
5.2 Turn on the heater to raise the temperature inside the transformer to the target value. When the target value is reached, run the vacuum pump 18 to evaporate the residual cleaning agent and electrical insulating oil containing PCBs.
5.3 The electrical insulating oil containing PCBs evaporated from the transformer (3) is condensed in the electrical insulating oil condenser (7), and the non-condensed electrical insulating oil containing PCBs is absorbed by the absorbent sprayed by the pump (17) in the absorption tower (8). Conveyed to the condenser 10.
5.4 The detergent is condensed in the detergent condenser 10 and stored in the detergent recovery tank 11, transferred to the detergent tank 16 by the pump 19 and stored.
5.5 Detergent A small amount of vapor phase detergent, not condensed in the condenser 10, is completely removed from the droplet separators 12 and 13, and the air passing through the droplet separator 13 is transferred to the air pollution preventer 14 and the air pollution monitoring device. 15) and finally released into the atmosphere.

      7 is a schematic diagram of a transformer chamber portion in which a plurality of transformers are connected and processed in parallel, so that two or more transformers may be mounted in the transformer chamber as needed to improve the efficiency of the device.

As described above, the present invention is intended to shorten the processing time and lower the heating temperature since the inflow power device is not disassembled or cut in order to simultaneously remove the PCBs and the electric insulating oil remaining in the inflow power device. It is a processing device for power equipment for PCBs contamination inflow by cleaning and vacuum heating.

1 is a schematic diagram of a treatment apparatus of a power device for PCBs contamination by cleaning and vacuum heating according to the present invention.
2 is an electrical insulating oil repelling process of the present invention.
3 is a pressure reduction process diagram of the present invention.
4 is a cleaning process diagram of the present invention.
Figure 5 is a cleaning process discharge chart of the present invention.
Figure 6 is a reduced pressure heating process diagram of the present invention.

     7 is a schematic diagram of a transformer chamber portion for processing a plurality of transformers connected in parallel in the present invention.

       <Description of the symbols for the main parts of the drawings>

1: transformer chamber 2: heater

3: transformer 4, 5: suction and discharge ports

6: transformer header 7: electric insulating oil condenser

8: absorption tower 9: evaporator

10: detergent condenser 11: detergent recovery tank

12, 13: droplet separator 14: air pollution prevention device

15: air pollution monitoring 16: cleaning tank

17, 19, 21, 23: pump 18: vacuum pump

20: electrical insulating oil recovery tank 22: electrical insulating oil tank

Claims (5)

      In the processing apparatus for separating the mixed solution of the PCBs and the electrical insulating oil remaining in the transformer (3), which is an inflow power equipment by vaporization and condensation by cleaning and reduced pressure heating,       A transformer chamber (1) in which the transformer (3) is mounted so as to perform cleaning treatment or reduced pressure heating treatment;        A transformer header 6 which connects a pump 17 capable of injecting a cleaner into the transformer 3 and a vacuum pump 18 capable of reducing pressure;       A suction / discharge port (4) (5) capable of discharging the electric insulating oil containing PCBs from the transformer (3), or suctioning or discharging liquid or gaseous substances such as cleaning agents;        A heater (2) mounted outside the transformer (3) for heating;       An electric insulating oil condenser (7) for cooling and condensing the electric insulating oil containing PCBs generated during the reduced pressure heating process of the transformer (3);       An absorption tower (8) for cleaning and absorbing the PCBs-containing electrical insulating oil remaining without condensation in the electrical insulating oil condenser (7);       An evaporator (9) for evaporating PCBs-containing electrical insulating oil and cleaning agent transferred from the transformer chamber (1) and the absorption tower (8);        Detergent condenser for cooling the vapor phase detergent delivered from the evaporator 9 10;       An electric insulating oil recovery tank (20) for recovering the electric insulating oil containing PCBs remaining in the evaporator (9);        Contains PCBs transferred from the transformer chamber 1 or the insulating oil recovery tank 20 An electrical insulating oil tank (22) storing electrical insulating oil;        Detergent recovery tank 11 for recovering the detergent remaining in the cleaner condenser 10 Wow;       Cleaner mist remaining in the air conveyed from the cleaner condenser 10 A droplet separator 12 for separating;       Cleaner droplets remaining in the air conveyed from the electric insulating oil condenser 7 Drop separator 13 for separating the;      An air pollution prevention device (14) for preventing a small amount of cleaning agent contained in the air conveyed from the droplet separator (13);       Air pollution monitor (15) for monitoring the air transferred from the air pollution prevention device (14) Wow;      The cleaning device of the power equipment for the PCBs contamination inflow by cleaning and pressure-reduction heating, characterized in that consisting of a cleaning tank (16) for storing the cleaning agent transferred from the cleaning agent recovery tank (11). The method according to claim 1, wherein the transformer (3) uses its own case as a cleaning treatment tank and a decompression tank, so there is no need to separately manufacture these tanks. Processing device for power equipment. The apparatus of claim 1, wherein the inner member of the transformer 3 is not dismantled or cut. The apparatus of claim 1, wherein the transformer (3) is connected to one or more of the transformer (3). The apparatus of claim 1, wherein the cleaning agent may use a liquid phase or a vapor phase in combination.

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