JPH10277353A - Sf6 gas regeneration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the automatic regeneration of SF6 gas in a minimum time and at an appropriate purity level by providing a circulating means by which the gas is returned to a filter unit when it is interpreted that the purity of the gas is below a set value. SOLUTION: A gas is cleaned by a filter unit 2 and part of the gas is analyzed by an analysis unit 3. When it is interpreted that the purity of the gas is not upto a target value through the analysis of the gas, a circulation valve 71 is opened to return the gas to the filter unit 2 through circulation piping 7 and the gas is again cleaned by the filter unit 2. By circulating the gas through the filter unit 2 so many numbers of time, the purity of the gas is above the target value and a control unit activates a compressor in a condenser unit 4. The gas pressurized by the condenser unit 4 is stored in a storage tank 5. When transferring the gas from a tank 5 to the container of gas insulating equipment 1, this transfer is to be performed after opening a valve 61 and then vaporizing the liquefied SP6 gas by an evaporator 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to S
The present invention relates to an apparatus for regenerating F ₆ gas.

[0002]

2. Description of the Related Art SF ₆ gas, which is used as an insulating medium for gas circuit breakers and gas insulated equipment, is exposed to a high-temperature arc generated at the time of current interruption, and is thermally decomposed or deteriorated. In this case, moisture deposited from the component parts described above is mixed or fine powder of a metal oxide is mixed, thereby lowering the dielectric strength.

[0003] Therefore, periodically or when the number of cutoffs reaches a specified value, SF ₆ gas as an insulating medium is extracted to the outside and a treatment for regeneration is performed. This reproduction processing is generally performed as follows. That is, the extracted SF
_{The six} gases are passed through an adsorbent that adsorbs impurities and a filter that removes solids to remove these harmful substances.

[0004] In this case, the state of regeneration of SF ₆ gas is checked by extracting a small amount of gas that has been extracted through a solids removal filter or a filter pre-coated with an adsorbent, and regenerating with a reagent or the like. An operator checked whether the process was proceeding, and when regeneration was insufficient, the filter and the adsorbent were passed again.

[0005]

In the above-mentioned prior art, it is difficult to determine how many times a filter or an adsorbent is passed for regenerating to a desired purity after retrieving the insulating medium. Therefore, during the regeneration operation, the operator must frequently perform a check with a reagent or the like after an appropriate time has elapsed, and there is a problem that the operator is bad.

Recently, there is a shortage of skilled workers, and despite the fact that sufficient regeneration has already been performed, wasteful regeneration work may be continued. It has been desired to establish a technique for regenerating to an appropriate purity by using the above method.

The present invention has been made in view of the foregoing, and an object of the present invention is to provide an SF ₆ gas of this kind which can automatically regenerate SF ₆ gas to an appropriate purity in a minimum necessary time. ₍₆₎ To provide a gas regenerator.

Another object of the present invention is to provide an SF ₆ gas regenerating apparatus which can easily move the regenerating apparatus main body to the vicinity of the gas insulated equipment and can improve workability.

[0009]

That is, the present invention comprises an SF ₆ gas circulating system having a filter unit, and introduces and circulates SF ₆ gas in a gas insulating device into the circulating system.
In SF ₆ gas regeneration system which is formed so as to reproduce the SF ₆ gas in the gas insulated equipment, in the circulation system, an analysis unit for analyzing the filter unit in the treated gas are analyzed by the analysis unit Circulation means for returning to the filter unit again when the purity of the SF ₆ gas is determined to be equal to or less than the set value, and processing when the purity of the SF ₆ gas analyzed by the analysis unit exceeds the set value. A return means for returning the SF ₆ gas to the gas-insulated equipment is provided to achieve the intended purpose. The SF ₆ reproducing apparatus of the present invention is connected to a gas-insulated apparatus SF ₆ gas is sealed, and neutralizing means for neutralizing the strong acid gas in the SF ₆ gas, neutralized by the neutralizing means A filter unit having a built-in filter for filtering and adsorbing impurities other than the SF ₆ gas, an analysis unit for analyzing the gas processed by the filter unit, and a gas storage tank, and analyzed by the analysis unit. When the purity of the SF ₆ gas in the insulating medium is determined to be equal to or less than the set value, a circulation pipe having a circulation valve for returning to the filter unit again, and the purity of the SF ₆ gas in the insulating medium exceeds the set value. a storage pipe has a storage valve for storing the SF ₆ gas that has been treated to the gas storage tank when it is determined that the gas insulation with SF ₆ gas in the storage tank A return pipe having a return valve for returning to the edge device, and a control unit for taking in the analysis result of the analysis unit and controlling each valve are provided.

In this case, the analysis unit includes a gas chromatograph and an ion chromatograph, and the control unit transmits the gas processed by the filter unit to the gas chromatograph and the ion chromatograph at predetermined time intervals. The analysis unit is controlled to capture and analyze. Further, the filter unit includes a filter for filtering solids in the insulating medium and a SF ₆ filter.
And a filter having an adsorbent for adsorbing impurities other than gas. Further, an evaporator is provided in the return pipe. Further, the neutralization means is constituted by a dry neutralization tank containing an adsorbent for adsorbing a strongly acidic gas. Further, the neutralization tank, the filter unit, the analysis unit, the control unit, and the circulation pipe are mounted on the same carriage.

That is, in the SF ₆ gas regenerating apparatus formed as described above, an analysis unit for analyzing the gas processed by the filter unit is provided to a circulation system for introducing and circulating SF ₆ gas from a gas insulating device. When the purity of the SF ₆ gas analyzed by the analysis unit is determined to be equal to or lower than the set value, a circulation unit is provided to return the gas to the filter unit again. The SF ₆ gas automatically circulates through the filter unit until it reaches, so that the purity of the SF ₆ gas can be increased to a desired level. It is performed automatically without any excess and shortage, and the workability can be significantly improved. In addition, since the regenerating device, that is, the filter unit, the analyzing unit, the gas storage tank, the control unit, and the circulation pipe are arranged on the same truck, the regenerating device can be easily moved to the vicinity of the gas insulated equipment integrally. This makes the work easy, including the setup of the regeneration work.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a block diagram showing the SF ₆ gas regeneration device and the gas insulation device. 1
Is a gas insulated device using SF ₆ gas as an insulating medium, and reference numeral 90 in the figure including the filter unit 2 and the control unit 8 is an SF ₆ gas regenerating device.

[0013] This gas regenerating apparatus is particularly formed as follows. That is, the gas insulating device 1 using SF ₆ gas as an insulating medium is provided with a connection port 11 for filling or extracting a part of the container with a gas. It is isolated from the outside air by a shutoff valve that does not.

In order to regenerate the insulating medium of the gas-insulated device 1, the carriage (see FIG. 2) on which the regenerating device is mounted is moved to the vicinity of the gas-insulated device 1 and the flexible pressure-resistant hose 21 is moved.
Is connected to the connection port 11. The pressure-resistant hose 21 communicates with the neutralization tank 10 via an electric inlet valve 22. The neutralization tank 10 is provided to neutralize highly active strong acid gas generated in the insulating medium, maintain the performance of a filter installed at the subsequent stage, and extend the life of the filter. .

The neutralization tank 10 contains a built-in adsorbent for selectively adsorbing strongly acidic HF gas. When the insulating medium passes through the tank, the HF gas is adsorbed. The insulating medium is neutralized. As a means for neutralizing, a general neutralizing means for passing a gas through an alkaline solution can be used. In a dry neutralization method using an adsorbent, handling properties are improved because an alkaline solution is not used.

A filter unit 2 is provided downstream of the neutralization tank 10. The filter unit 2 includes a filter for removing solid matter, an adsorption filter precoated with an adsorbent for adsorbing impurities such as decomposition gas, and an adsorbent for adsorbing moisture. As this filter unit 2, for example, S manufactured by DILO
A filter device for F ₆ gas can be applied.

The gas processed by the filter unit 2 is led to an analysis unit 3 where the purity and water content of the SF ₆ gas are analyzed. A gas chromatograph and an ion chromatograph are used to analyze the purity of the gas in the analysis unit 3. In ion chromatography,
The concentration of HF in the SF ₆ gas is measured, and other generated impurities are measured by gas chromatography. For analysis of moisture, for example, an electronic moisture meter manufactured by Deiro can be used.

The gas analyzed by the analysis unit 3 is judged to be in a regenerating state, and the filter unit is processed again by the internal circulation means. That is, if the regeneration is not sufficient, the motor-operated valve 41 is closed, the circulation valve 71 is opened, and the gas is returned to the neutralization tank 10 through the circulation pipe 7, and the gas is returned to the neutralization tank 10 and the filter unit 2. Purification is performed. When regeneration is sufficiently performed, the electric valve 41
Is opened, guided to the condenser unit 4 having a built-in compressor unit, where it is pressurized, cooled and liquefied, and then stored in the storage tank 5 via the electric valve 42.

The control unit 8 receives the analysis data of the analysis unit 3 and compares it with a target value set in advance by an operator. Based on the result, the compressor and condenser unit 4 in the filter unit 2 are controlled. Compressors and electric valves 22, 41, 42,
61 and 71 are controlled. The target value set in the control unit 8 can be arbitrarily set by the operator from the keyboard 81 of the unit 8. The set target value and the value detected by the analysis unit are digitally displayed on the display unit 82.

Power for operating the reproducing apparatus is supplied from outside by a cable. An operation program for automatically performing a series of reproduction operations is incorporated in the control unit 8 in advance. Therefore, after connecting the regenerating apparatus to the gas insulating device 1, a target value is set,
When the start button is pressed, the compressor and the motor-operated valve are operated according to a predetermined seal according to a control signal from the control unit 8, and the regeneration operation is automatically performed.

The regenerated gas passes through the return pipe 6 having the return valve 61 and is returned to the container of the gas insulating device 1 gasified by the evaporator 9.

This reproducing apparatus is mounted on a trolley,
As shown in FIGS. 2 and 3, a neutralization tank 10, a storage tank 5, a filter unit 2, and an evaporator 9 are provided on a trolley 12, and an analysis unit 3 and a control unit 8 are provided.
Are arranged vertically. The piping connecting the filter units 2 and 3 and the capacitor unit 4 is arranged at a position connecting these devices with the shortest distance. In addition, electric valves 22, 41, 42, 61,
A control signal line from the control unit 8 is connected to 71.

In the examples shown in FIGS. 2 and 3, all the devices for regeneration are provided on one truck. However, when the capacity of the storage tank 5 is to be increased, the tank 5 and the evaporator 9 are required. Can be installed on a separate carriage and connected with a pressure-resistant hose.

Next, the operation of the reproducing apparatus will be described. First, the pressure-resistant hose 21 is connected to the connection port 11, and the keyboard 8
Set target values of gas purity and moisture content from 1 and press the start button to start. When the start button is activated, the control unit 8 opens the electric inlet valve 22 and activates the compressor incorporated in the filter unit 2 to suck the gas in the container into the neutralization tank 10. The strong acid gas is neutralized when the gas passes through the neutralization tank. The gas that has passed through the neutralization tank 10 is guided to the filter unit 2, and passes through the filter and the adsorbent in the filter unit 2 to remove impurities in the gas.

A part of the gas purified by the filter unit 2 is sampled and analyzed by the analysis unit 3. The analysis operation of the analysis unit 3 is performed by a control signal from the control unit 8. That is,
When the gas to be processed is taken into the filter unit 2, it is programmed to perform sampling and analysis for analysis at a predetermined time period.

As a result of the gas analysis, when it is determined that the purity of the gas has not reached the target value, the electric circulation valve 71 is opened, and the gas is returned to the filter unit 2 via the circulation pipe 7. Purify again with the filter unit 2.

When the filter unit 2 is circulated several times, the purity of the gas exceeds the target value. The control unit 8 closes the circulation valve 71, opens the electric valve 41, and starts the compressor in the condenser unit 4. I do. The gas pressurized in the condenser unit 4 is cooled and liquefied, and stored in the storage tank 5 through the electric valve 43.
This regenerating operation is continued until the gas in the container of the gas insulating device 1 is exhausted, and all the gas in the container is regenerated and stored in the storage tank 5. When the gas in the tank 5 is transferred to the container of the gas insulating apparatus 1, the valve 61 is manually or automatically opened, and the liquid SF ₆ gas is vaporized by the evaporator 9 and returned to the gas.

Thus, SF _{6 is} controlled by the control unit.
By circulating the gas through the filter unit, S
The purity of the F ₆ gas can be increased to a desired level, and the purity of the gas can be checked periodically during the regeneration operation, so that the regeneration operation can be performed automatically without any excess or shortage, and the workability is significantly improved. In addition, since the regenerators are arranged on the same carriage, the regenerators can be easily integrated and moved to the vicinity of the gas insulated equipment, and the operation is further improved.

[0029]

As described above, according to the present invention, this type of SF ₆ gas regenerating apparatus is capable of automatically regenerating SF ₆ gas to an appropriate purity in a minimum necessary time. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of an SF ₆ gas regeneration device of the present invention.

FIG. 2 is a front view showing one embodiment of an SF ₆ gas regeneration device of the present invention.

FIG. 3 is a side view showing an embodiment of the SF ₆ gas regeneration device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas insulation equipment, 2 ... Filter unit, 3 ... Analysis unit, 4 ... Condenser unit, 5 ... Storage tank,
7 ... circulation piping, 8 ... control unit, 9 ... evaporator, 10 ...
Neutralization tank, 11 connection port, 12 trolley, 22 inlet valve.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Iwao Umene 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Shin Tamada 3-chome, Sachimachi, Hitachi City, Ibaraki Prefecture No. 1 Inside Hitachi, Ltd. Hitachi Plant

Claims (7)

[Claims] [Claim 1 further comprising a SF ₆ gas circulation system having a filter unit, the SF ₆ gas in the gas insulated equipment is introduced circulated to the circulation system, play a SF ₆ gas in the gas insulated apparatus through the filter unit In the SF ₆ gas regenerating apparatus, the analysis system for analyzing the gas processed by the filter unit in the circulation system, and the purity of the SF ₆ gas analyzed by the analysis unit is equal to or less than a set value. It said gas insulated apparatus and circulation means for again returning to the filter unit when it is judged, the SF ₆ gas were processed when the purity of SF ₆ gas which is analyzed by the analyzing unit is determined to exceed the set value and A SF ₆ gas regenerating apparatus, comprising: a return means for returning the gas to a gas. An SF ₆ gas circulating system having a filter unit is provided. The SF ₆ gas in the gas insulating device is introduced and circulated in the circulating system so that the filter unit regenerates the SF ₆ gas in the gas insulating device. SF being formed
In ₆ gas regeneration system, the device, the SF ₆ and neutralizing means for neutralizing the strong acid in the gas, SF _6, which is neutralized by the neutralizing means
A filter unit having a built-in filter for filtering and adsorbing impurities other than gas, an analysis unit for analyzing the gas processed by the filter unit, and a gas storage tank for storing the processed gas, and analyzing by the analysis unit When it is determined that the purity of the SF ₆ gas in the insulating medium is equal to or less than the set value, a circulation pipe having a circulation valve for returning the filter to the filter unit again, and the purity of the SF ₆ gas in the insulating medium is set to the set value. When it is determined that the gas flow rate exceeds the threshold, a storage pipe for storing the processed SF ₆ gas in the gas storage tank, a return pipe for returning the SF ₆ gas in the storage tank to the gas insulating device, and an analysis of the analysis unit captures the results, characterized in that a control unit for controlling the valves of the respective pipes SF ₆ gas regeneration system. 3. The analysis unit includes a gas chromatograph and an ion chromatograph, and the control unit includes:
3. The SF ₆ gas regeneration apparatus according to claim 2, wherein the analysis unit is controlled so that the gas processed by the filter unit is taken into the gas chromatograph and the ion chromatograph at a predetermined time interval to perform analysis. 4. The SF ₆ gas according to claim 1, wherein the filter unit comprises a filter for filtering solids in the insulating medium and a filter having an adsorbent for adsorbing impurities other than SF ₆ gas. Playback device. 5. The SF ₆ gas regenerating apparatus according to claim 2, wherein an evaporator is provided in the return pipe. 6. The SF ₆ gas regenerating apparatus according to claim 2, wherein said neutralization means comprises a dry neutralization tank containing an adsorbent for adsorbing a strongly acidic gas. 7. The SF ₆ gas regeneration apparatus according to claim 2, wherein the neutralization tank, the filter unit, the analysis unit, the control unit, and the circulation pipe are mounted on the same truck.