DE102010045239B4 - Method and arrangement for drying a transformer component - Google Patents

Abstract

Method for drying at least one transformer component (20) of a transformer, wherein - the transformer component is dried in an oven (30) and - at least one operating device (40) used for the drying operation is cooled using energy (W, W1, W2), which is generated in connection with the drying of the transformer component in the form of heat, characterized in that - waste heat (A) from the furnace is fed directly or indirectly into an absorption refrigeration machine (110) and - with the refrigeration output (K, K1, K2) the operating equipment is cooled.

Description

The invention relates to a method having the features according to the preamble of patent claim 1.

Such a method for drying a transformer component of a transformer is known, for example, from German Offenlegungsschrift DE 195 01 323 A1 known. In this prior art method, the solid insulation of a transformer are dried while it is placed in an electrical system. For this purpose, the solid insulation is contacted with heated transformer oil, and it is degassed and / or dehydrated contacted with the solid insulation transformer oil. In parallel, the windings of the transformer are heated by means of a guided in its high-voltage windings low-frequency heating current to a first average winding temperature. At this temperature, the solid insulations are pre-dried in oil until the oil is heated to an upper oil temperature below the first mean winding temperature. After reaching the upper oil temperature, the treated oil is removed from the transformer housing, and the windings are heated under vacuum or at negative pressure in the oil-free transformer housing to a second average winding temperature, which is higher than the first average winding temperature. At this temperature, the predried solid insulations are completely dried under vacuum or at reduced pressure.

The DE 37 16 733 A1 describes a drying process in which the drying gas is passed in a closed circuit over a heating and condensation section, which are thermally coupled by a condensation heat pump. The condensation heat can be used to heat the dried gas.

In the DE 22 35 422 For example, a drying process is described in which the material to be dried is brought into contact with injected ethylene glycol diacetate in a vacuum chamber. The hydrous ethylene glycol diacetate vapor is withdrawn from the vacuum chamber and re-liquefied in a condenser. After separation from the water contained, the ethylene glycol diacetate was returned to the vacuum chamber until complete drying of the material.

The US 4,926,567 A describes a method for drying coated tissue. The fabric is passed through an oven filled with hot inert gas. The flammable solvent contained in the tissue is separated by condensation. The inert gas with residues of the solvent is subsequently heated in a heat exchanger. Subsequently, the solvent residues are burned in an incinerator. The heat of combustion in turn feeds the heat exchanger.

The invention has for its object to provide an energy-efficient method for drying a transformer component.

This object is achieved by a method having the features according to claim 1. Advantageous embodiments of the method according to the invention are specified in subclaims.

Thereafter, according to the invention, it is provided that the transformer component is dried in an oven and at least one operating device used for the drying operation is cooled using energy which is generated in the form of heat in connection with the drying of the transformer component. In addition, a significant advantage of the method according to the invention is that the heat released during the drying of the transformer component is - at least in part - not dissipated unused, but instead is selectively reused. In accordance with the invention, released heat is used to cool at least one operating device which is used for the drying operation or which is required to cool it using the waste heat energy.

According to a particularly preferred embodiment of the method, it is provided that waste heat of the furnace is fed directly or indirectly into an absorption refrigerating machine and the operating device is cooled with the cooling power delivered by the absorption refrigerating machine on the output side.

It is considered advantageous if the transformer component is dried with a dry, hot gas, which is deprived of heat which is formed during drying wet hot gas outside the furnace, and the extracted heat is used to cool the operating device. For drying the transformer component, a kerosene-containing gas is preferably used.

More preferably, a vacuum oven is used to dry the transformer component. As the operating means, for example, vacuum pumps for evacuating the vacuum furnace, hydraulic components of a hydraulic system, or other means may be cooled.

The invention further relates to an arrangement for drying at least one transformer component of a Transformer. According to the invention, it is provided in this regard that the arrangement comprises an oven, at least one operating device used for the drying operation and an energy recovery device which cools the operating device using energy which is generated in connection with the drying of the transformer component. According to the invention, it is provided that the energy recovery device comprises an absorption chiller in which heat or waste heat of the furnace is fed directly or indirectly, and the absorption chiller is on the output side in communication with the operating device and cools it with the generated cooling capacity.

With regard to the advantages of the arrangement according to the invention, reference is made to the above statements in connection with the method according to the invention, since the advantages of the arrangement according to the invention essentially correspond to those of the method according to the invention.

It is also considered advantageous if the arrangement comprises a gas cycle with a Einkoppelpfad, a Auskoppelpfad and the Einkoppelpfad and the Auskoppelpfad connecting condensers, via the Einkoppelpfad dry hot gas is fed into the furnace, via the Auskoppelpfad that during drying forming wet hot gas is passed to the condenser and the wet hot gas is dried in the condenser.

In the case of the presence of such a gas cycle, it is also considered advantageous if in the Auskoppelpfad a heat exchanger is arranged, which cools the wet hot gas before it is passed into the condenser. On the output side, the heat exchanger is preferably connected to an absorption chiller of the energy recovery device and feeds the heat extracted from the gas into the absorption chiller.

As already mentioned above, the furnace may be, for example, a vacuum furnace. For example, a vacuum pump, a hydraulic component of a hydraulic system or another device can be cooled as the operating device.

The invention will be explained in more detail with reference to embodiments; thereby show by way of example

1 a first embodiment of an inventive arrangement for drying a transformer component, wherein the method according to the invention is explained by way of example with reference to the arrangement;

2 a second embodiment of an inventive arrangement for drying a transformer component, wherein in this second embodiment, a used for drying gas for energy recovery is used; and

3 a third embodiment of an inventive arrangement in which both the outside wall side emitted waste heat of a furnace of the arrangement as well as the heat of a used for drying the transformer component drying gas is used for energy recovery.

For the sake of clarity, the same reference numbers are always used in the figures for identical or comparable components.

In the 1 you can see an arrangement 10 for drying a transformer component 20 a transformer, not shown. The transformer component 20 is during the drying process in an oven, which is preferably a vacuum oven 30 is.

With the vacuum oven 30 is a vacuum pump 40 who has the task, the interior 50 of the vacuum furnace 30 to evacuate or a defined negative pressure inside 50 to ensure.

The order 10 also has a gas cycle 60 on, the one Einkoppelpfad 70 , a decoupling path 80 as well as the Einkoppelpfad 70 and the decoupling path 80 connecting condensers 90 and a downstream heater 95 includes.

With the vacuum oven 30 is also a heat exchanger 100 in conjunction, that of the vacuum oven 30 Waste heat A emitted via the furnace walls to the outside and emitted in the form of heat energy W on the output side. For the transport of waste heat A, for example, a hydraulic system HS can be used, which in the 1 is indicated schematically by a connecting line.

With the exit of the heat exchanger 100 is an inlet E110 of an absorption chiller 110 connected to the heat energy W of the heat exchanger 100 processed and produced at an output A110 cooling capacity K.

The outlet A110 of the absorption chiller 110 is directly or indirectly with the vacuum pump 40 in conjunction, leaving the vacuum pump 40 from the absorption chiller 110 is cooled.

The heat exchanger 100 and the absorption chiller 110 thus form an energy recovery device 120 that the waste heat A of the vacuum furnace 30 uses one for the drying operation of the transformer component 20 used operating equipment, namely the vacuum pump 40 to cool using energy associated with drying the transformer component 20 in the form of waste heat A is generated.

The order 10 according to 1 can be operated, for example, as follows:
From the heater 95 a hot dry Kerosingas HTK is issued by the heater 95 over the Einkoppelpfad 70 in the interior 50 of the vacuum furnace 30 is fed. The hot dry Kerosingas HTK dries the transformer component 20 by removing this water. This creates inside 50 of the vacuum furnace 30 Hot wet Kerosingas HNK coming over the decoupling path 80 back to the condenser 90 is directed. In the condenser 90 The water is extracted from the hot, wet Kerosingas HNK. That in the condenser 90 cooled Kerosingas is in the heater 95 heated again, and it is again formed in this way hot dry kerosene gas HTK, which is in the vacuum oven 30 is fed.

With the vacuum pump 40 is in the interior during drying 50 of the oven 20 formed a predetermined negative pressure or vacuum.

The from the vacuum oven 30 Output waste heat A is from the heat exchanger 100 taken and in the form of heat energy W in the absorption chiller 110 fed, the output side cooling capacity K generated. The cooling capacity K is used to the vacuum pump 40 to cool during the drying process.

The 2 shows a further embodiment of an arrangement 10 for drying a transformer component 20 inside 50 a vacuum oven 30 is arranged. With the vacuum oven 30 there is a gas cycle 60 in connection, which has a Einkoppelpfad 70 , a decoupling path 80 as well as a condenser 90 and a downstream heater 95 includes. In addition - unlike the embodiment according to 1 - indicates the gas cycle 60 a heat exchanger 200 on, in the decoupling path 80 and thus in the gas flow direction before the condenser 90 is arranged.

With the heat exchanger 200 is an entrance E110 an absorption chiller 110 in conjunction with the output side with a vacuum pump 40 the arrangement 10 connected is.

The arrangement according to 2 can be operated, for example, as follows:
With the gas cycle 60 hot dry Kerosingas HTK is generated, which in the interior 50 of the vacuum furnace 30 is fed to the transformer component 20 to dry. The resulting hot wet Kerosingas HNK is from the vacuum oven 30 led out and into the heat exchanger 200 of the gas cycle 60 fed. The function of the heat exchanger 200 consists of cooling, for example, between 120 ° C and 130 ° C hot wet kerosene gas HNK to a temperature of, for example, 80 ° C and the resulting heat energy W in the absorption chiller 110 feed. This allows the absorption chiller 110 to produce at its output A110 cooling capacity K, with which the vacuum pump 40 during the evacuation of the interior 50 of the vacuum furnace 30 is cooled.

In the embodiment according to 2 form the gas cycle 60 with the heat exchanger 200 and the absorption chiller 110 thus an energy recovery device 120 ' , In the energy recovery device 120 ' becomes the heat of the vacuum furnace 30 , which is discharged by the hot wet kerosing gas HNK, into the absorption chiller 110 fed to energy recovery.

In the 3 is a third embodiment of an arrangement 10 for drying a transformer component 20 shown inside a vacuum oven 30 is arranged.

In the arrangement 10 according to 3 has an absorption chiller 110 two inputs, namely a first input E110a and a second input E110b.

The first inlet E110a of the absorption chiller 110 is to a first heat exchanger 100 connected to the waste heat A, which is on the outside wall of the vacuum furnace 30 is discharged, for example, via the hydraulic system HS is fed.

To the second inlet E110b of the absorption chiller 110 is a second heat exchanger 200 connected to a gas cycle 60 belongs. The second heat exchanger 200 is located in the Auskoppelpfad 80 and is thus in front of a condenser 90 of the gas cycle 60 arranged.

An outlet A110 of the absorption chiller 110 stands with a vacuum pump 40 in contact with the interior 50 of the vacuum furnace 30 is evacuated.

The order 10 according to 3 can be operated, for example, as follows:
For drying the transformer component 20 Hot Dry Kerosene gas HTK becomes via the feed-in path 70 in the interior 50 of the vacuum furnace 30 fed. The kerosene gas withdraws from the transformer component 20 Wetness, eliminating the transformer component 20 is dried. The resulting about 120 ° C to 130 ° C hot wet kerosene gas HNK reaches the second heat exchanger 200 , which cools the Kerosingas HNK to a temperature of about 80 ° C. The resulting heat energy W2 is applied to the second input E110b of the absorption chiller 110 issued. The absorption chiller 110 generated with the heat energy W2 of the second heat exchanger 200 Cooling capacity K2, with which the vacuum pump 40 is cooled.

In addition, the absorption chiller 110 supplied with heat energy W1 from the first heat exchanger 100 is delivered. The first heat exchanger 100 contains waste heat A of the furnace 20 , for example, on the outside wall of the vacuum furnace 30 discharged and via the hydraulic system HS to the first heat exchanger 100 is directed. This heat energy W1 is used to form cooling capacity K1 and thus to cool the vacuum pump 40 used.

In summary, the arrangement 10 according to 3 Thus, two energy recovery paths, namely a recovery path, the first heat exchanger 100 includes, and a second recovery path, the second heat exchanger 200 includes. The first recovery path uses the on the outer wall of the vacuum furnace 30 discharged waste heat A, and the second recovery path uses the waste heat from the hot wet kerosenas HNK from the inside 50 of the vacuum furnace 30 is discharged to the outside.

In the embodiments according to the 1 to 3 For example, it is assumed that with the cooling capacity of the absorption chiller, the vacuum pump 40 is cooled.

Alternatively or additionally, other components can be cooled, for example, the condenser 90 or hydraulic components, eg. B. hydraulic pumps of the hydraulic system HS.

It is also possible, the heat energy W (see. 1 ) or W1 (cf. 3 ) of the heat exchanger 100 the heater 95 To make available so that this with the heat energy W or W1 in the condenser 90 cooled kerosenas can heat up again, for example, to a temperature of 120 ° C to 130 ° C. The heater 95 may be formed for example by a heat exchanger.

Alternatively or additionally, the heating device 95 with the heat energy W (cf. 2 ) or W2 (cf. 3 ) of the heat exchanger 200 be fed to the heater 95 that in the condenser 90 cooled Kerosingas can heat up again.

LIST OF REFERENCE NUMBERS

10

arrangement

20

transformer component

30

vacuum furnace

40

vacuum pump

50

Inner

60

Gas circuit

70

coupling path

80

decoupling path

90

condenser

95

heater

100

heat exchangers

110

Absorption chiller

120

Energy recovery device

120 '

Energy recovery device

200

heat exchangers

A

waste heat

A110

output

E110

entrance

E110A

first entrance

E110B

second entrance

HNK

wet kerosene gas

HS

hydraulic system

HTK

dry kerosene gas

K, K1, K2

Cooling capacity

W, W1, W2

Thermal energy

Claims (8)

Process for drying at least one transformer component ( 20 ) of a transformer, wherein - the transformer component in an oven ( 30 ) and - at least one operating device used for the drying operation ( 40 ) is cooled using energy (W, W1, W2) generated in connection with the drying of the transformer component in the form of heat, characterized in that - waste heat (A) of the furnace flows directly or indirectly into an absorption chiller ( 110 ) is fed and - is cooled with the output of the absorption chiller cooling capacity (K, K1, K2), the operating device. Method according to claim 1, characterized in that - dried the transformer component with a dry hot gas (HTK), - is removed from the outside of the furnace during the drying wet hot gas (HNK) heat and - the heat extracted is used to cool the operating device. Method according to one of the preceding claims, characterized in that a kerosene-containing gas is used to dry the transformer component. Method according to one of the preceding claims, characterized in that - a vacuum furnace is used to dry the transformer component and - a vacuum pump is used as operating device ( 40 ) is cooled to evacuate the vacuum furnace. Arrangement ( 10 ) for drying at least one transformer component ( 20 ) of a transformer according to claim 1, wherein the arrangement comprises a furnace ( 30 ), at least one operating device used for the drying operation ( 40 ) and an energy recovery device ( 120 . 120 ' ), which cools the operating device using energy generated in connection with the drying of the transformer component, characterized in that - the energy recovery device is an absorption chiller ( 110 ), in the heat (A) of the furnace is fed directly or indirectly, and - the absorption chiller on the output side communicates with the operating device and cools it with the generated cooling capacity. Arrangement according to claim 5, characterized in that - the arrangement a gas circulation ( 60 ) with a coupling path ( 70 ), a decoupling path ( 80 ) and a condenser connecting the coupling-in path and the coupling-out path ( 90 ), - being fed via the coupling path dry hot gas (HTK) in the furnace, via the Auskoppelpfad the forming during drying wet hot gas (HNK) is passed to the condenser and the wet hot gas is dried in the condenser , Arrangement according to claim 6, characterized in that - in the Auskoppelpfad a heat exchanger ( 200 ) is arranged, which cools the wet hot gas before it is passed into the condenser, and - the heat exchanger on the output side with the absorption chiller ( 110 ) of the energy recovery device is connected and feeds the heat extracted from the gas into the absorption chiller. Arrangement according to one of the preceding claims 5-7, characterized in that - the oven is a vacuum oven and - The operating device is a vacuum pump.

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