JP3151460B2 - Gas recovery and filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas recovery and filling apparatus for temporarily recovering gas from a device to be recovered for inspection or the like, and filling and returning the device to be recovered with gas after completion of the inspection or the like. About.

[0002]

2. Description of the Related Art Conventionally, in a power substation, a gas circuit breaker (GCB) which compresses and accommodates SF ₆ gas is sometimes used as a circuit breaker. And a gas-insulated substation (GIS) in which SF ₆ gas having high insulation properties is sealed. When a gas circuit breaker or a tank is regularly inspected at such a substation, the gas recovery and filling device is brought into the substation in advance, and SF ₆ is discharged from the substation tank and the like by the gas recovery and filling device. The gas is temporarily recovered as a liquefied gas, and after the inspection is completed, the liquefied gas is vaporized and returned to a tank or the like.

[0003] The gas recovery filling device generally comprises a compressor for compressing by sucking a gas such as SF ₆ from the collecting device,
A condenser for cooling and liquefying the gas compressed by the compressor, a collection container (tank or cylinder) for storing the liquefied gas, and a vaporizer for heating and vaporizing the liquefied gas in the collection container. Have. Further, the gas vaporized by the vaporizer may contain moisture, and this moisture is SF
_{Since the} gas ₆ has an adverse effect on the insulating properties, it is common to provide an adsorption tower for storing an adsorbent such as silica gel for removing moisture in the vaporized gas. Some gas collecting and filling devices do not include a condenser and a vaporizer and store collected gas in a collection container in a gaseous state. In this case, the collected gas is returned to the device to be collected. Occasionally, an adsorption tower is used to remove water.

[0004]

However, in the conventional gas recovery and filling apparatus described above, the gas in the equipment to be recovered is only sucked by the suction force accompanying the operation of the compressor. Gas is likely to remain without being collected. In particular, in the case of SF ₆ gas used in a gas insulated substation (GIS), the recovered amount is very large, and the remaining amount is also large. The remaining gas is released into the atmosphere, which contributes to global warming.

In order to solve this problem, it is conceivable to equip a gas collecting and filling apparatus with a vacuum pump and to evacuate and collect the gas in the equipment to be collected by the vacuum pump. However, when returning gas to the vacuum-collected equipment, there are the following problems.

[0006] That is, the adsorbent in the adsorption tower provided in the gas recovery and filling device limits the flow rate to a certain value or less in order to remove moisture in the gas flowing through the adsorbent. When the gas is returned into the equipment to be recovered, the flow rate exceeds this value, and the performance of the adsorbent is not sufficiently exhibited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a method of completely recovering a gas in a device to be recovered by vacuuming using a vacuum pump. An object of the present invention is to provide a gas collecting and filling apparatus capable of sufficiently securing the performance of an adsorbent by restricting a flow rate of a gas flowing in an adsorption tower when returning gas to a device to be recovered.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a gas recovery and filling device, which includes a compressor for sucking a gas from a device to be recovered and compressing the same, and a gas compressed by the compressor. It is assumed that a collection vessel for collecting and recovering the gas in a gas state or liquefied, and an adsorption tower for storing an adsorbent for removing moisture in the gas when returning the gas from the inside of the collection vessel to the equipment to be recovered. I do. Further, a vacuum pump for evacuating the gas from the device to be recovered and sending it to the compressor side, and a pressure provided on a pipe line between the adsorption tower and the device to be recovered and controlling the pressure on the adsorption tower side to a predetermined value And a pressure holding valve for maintaining the pressure.

With this configuration, when recovering the gas from the device to be recovered, the gas can be recovered by the evacuation of the vacuum pump without leaving the gas in the device to be recovered. The collected gas is compressed in a compressor and then collected in a recovery container in a gas state or liquefied.

On the other hand, when returning the gas into the equipment to be recovered, the gas is guided from the collection container to the adsorption tower, and water in the gas is removed by the adsorbent in the adsorption tower, and then the gas is removed from the equipment to be recovered. Fill. In this case, the interior of the device to be recovered is in a vacuum state at the start of gas filling, but the pressure on the adsorption tower side is maintained at a predetermined pressure by the pressure-holding valve, and the flow velocity of the gas flowing in the adsorption tower is also suppressed. For this reason, the performance of the adsorbent in the adsorption tower is sufficiently exhibited, and the moisture in the gas charged in the device to be recovered is reliably removed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a gas recovery and filling apparatus A according to an embodiment of the present invention. FIG. 1 shows an apparatus A in which SF ₆ gas is recovered from a gas insulated substation (GIS) B which is a device to be recovered. FIG. 2 shows a fluid circuit configuration of a portion where the recovered gas is filled into the gas insulated substation B.

In FIG. 1, a gas recovery and filling device A is located upstream of a gas recovery line 2 connected to a recovery tank 1 as a recovery container from a gas insulated substation B (gas insulated substation B side).
A surge tank 3, a motor-driven two-stage compressor 4, a filter 5 and a condenser 6.
, The SF ₆ gas is sucked and compressed from the gas insulated substation B, and liquefied by being cooled by the condenser 6, and the liquefied gas is stored in the recovery tank 1.

A cooling device 11 is provided in association with the condenser 6. In the present embodiment, the cooling device 11
A refrigerant circuit is constituted by the refrigerator 12 and the expansion valve 13,
Heat is exchanged in the condenser 6 to cool the SF ₆ gas flowing therein. Note that the cooling device 11 may be one that simply cools with a fan.

The gas recovery and filling apparatus A is provided with a vacuum pump 16 on the gas recovery line 2 on the upstream side of the surge tank 3. The vacuum pump 16 evacuates the gas from the gas insulated substation B. Compressor 4 via surge tank 3
To be sent to Between the vacuum pump 16 and the surge tank 3, an oil filter 17 and a pressure holding valve 18 for maintaining the pressure on the exhaust side of the vacuum pump 16 at a predetermined pressure (for example, 0.2 kgf / cm ² ) are provided. A pressure holding valve 22 is also provided in a pipe line 21 that connects the exhaust side and the suction side of the vacuum pump 16, and the set pressure of the pressure holding valve 22 is higher than the set pressure of the pressure holding valve 18 (for example, 0.4
kgf / cm ² ), and when the pressure on the exhaust side of the vacuum pump 16 exceeds this set value, the pressure leaks.

On the other hand, in FIG.
Is provided with a flow meter 31, a heater type evaporator 32, an adsorption tower 33, and the like in order from an upstream side (recovery tank 1 side) to a gas filling pipe 30 communicating from the recovery tank 1 to the gas insulated substation B. The liquefied gas is heated and vaporized by the evaporator 32 while sending a predetermined amount of the liquefied gas from 1 to the evaporator 32 as a vaporizer, and the vaporized gas is returned to the gas insulated substation B through the adsorption tower 33. It has become. The adsorption tower 33 stores an adsorbent such as silica gel therein, and removes moisture in a vaporized gas flowing through the adsorbent.

The evaporator 32 has a cylindrical liquid tank 41 containing a predetermined amount of heat medium oil as a heat medium liquid.
A cylindrical member 42 is disposed concentrically and the lower end thereof is fixed to the bottom surface of the liquid tank 41 inside the liquid container 41. The liquid tank 41 is formed between the inner tank 43 and the outer tank 44 outside the cylindrical member 42 by the cylindrical member 42. It is divided into. A heater 45 is arranged to hang down in the inner tank 43, while a helical heat transfer tube 46 is arranged in the outer tank 44 so as to surround the outer periphery of the cylindrical member 42. The heat transfer pipe 46 constitutes a part of the gas filling pipe 30, through which the liquefied gas flowing out of the recovery tank 1 flows.

A circulation line 4 is provided on the outer tank 44 side of the liquid tank 41.
7 is connected to the inner tank 43 side, and the other end of the circulation line 47 is connected to the inner tank 43 side. An oil pump 48 is provided in the circulation line 47, and the oil pump 48 and the circulation line 47 are connected to each other. As a result, the heating medium oil in the liquid tank 41 is taken out from the outer tank 44 side and returned to the inner tank 43 side.
Is configured. The oil level of the heat transfer oil in the liquid tank 41 is set higher than the upper end of the cylindrical member 42 in the use state, and when the heat transfer oil is circulated in the heat transfer oil circulating system 49, in the liquid tank 41, The heat medium oil overflows the upper end of the cylindrical member 42 from the inner tank 43 side and flows into the outer tank 44 side.

In addition, a pressure reducing valve 51 is provided between the evaporator 32 and the adsorption tower 33 in the gas filling pipe 30, and an adsorption tower is provided between the adsorption tower 33 and the gas insulated substation B. The pressure on the 33 side is set to a predetermined pressure (for example, 3 kgf / cm
² ) A pressure-holding valve 52 for holding is provided. FIG.
2, 61 is an electromagnetic valve, 62 is an on-off valve, 63 is a strainer, 64 is a pressure gauge, 65 is a vacuum gauge, 66 is a thermometer,
67 is a safety valve.

Next, to explain the operation and effect of the gas recovery filling apparatus A, the gas insulated substation B (details thereof tank) when recovering SF ₆ gas from a vacuum pump 1
Can be recovered without leaving SF ₆ gas in a gas insulated substation in B by 6 evacuated, it is possible to solve problems such as global warming due to the release of SF ₆ gas into the atmosphere. The recovered gas is compressed by the two-stage compressor 4 and then liquefied by being cooled by the condenser 6 and stored in the recovery tank 1 as a liquefied gas.

On the other hand, when returning the liquefied gas in the recovery tank 1 to the gas insulated substation B as the original vaporized gas, the liquefied gas in the recovery tank 1 is heated and vaporized by the evaporator 32, The water in the vaporized gas is removed by the adsorbent described above, and the gas is charged into the gas insulated substation B. in this case,
At the start of gas filling, the inside of the gas insulated substation B is in a vacuum state, but the pressure of the gas filling line 30 on the side of the adsorption tower 33 is maintained at a predetermined pressure by the holding pressure valve 52, and the vaporized gas flowing through the adsorption tower 33 is maintained. Is also suppressed. Therefore, the performance of the adsorbent in the adsorption tower 33 can be sufficiently exhibited,
Moisture in the vaporized gas filled in the gas insulated substation B can be reliably removed.

It should be noted that the present invention is not limited to the above-described embodiment, but includes various other forms.
For example, in the above-described embodiment, the case where the tank 1 is used as the recovery container and the liquefied gas in the tank 1 is heated and vaporized by the evaporator 32 has been described. However, the present invention uses a gas cylinder as the recovery container, Vessel (ie vaporizer)
The present invention can also be applied to the case where the liquefied gas in the collection container is naturally vaporized without using the gas.

Further, the present invention can be applied not only to the case where SF ₆ gas is recovered from the gas insulated substation B as in the embodiment, but also to the case where other gas is recovered from the equipment to be recovered. When the gas is collected in the collection container, the gas is not liquefied using the condenser 6 as in the embodiment,
The present invention can be applied to a case where the liquid is recovered in a vaporized state.

[0023]

As described above, according to the gas collecting and filling apparatus of the present invention, the gas can be collected without leaving the gas in the equipment to be recovered by the evacuation of the vacuum pump, and the gas in the vacuum state can be recovered. When returning the gas into the recovery equipment, the pressure on the adsorption tower side is maintained at a predetermined pressure by the holding pressure valve, and the flow velocity of the gas flowing therethrough can be suppressed, so that the performance of the adsorbent can be sufficiently secured. In addition, it is possible to reliably remove the moisture in the gas charged in the device to be recovered.

[Brief description of the drawings]

FIG. 1 is a fluid circuit configuration diagram of a recovery portion of a gas recovery and filling device according to an embodiment of the present invention.

FIG. 2 is a fluid circuit configuration diagram of a filling portion in the same manner.

[Explanation of symbols]

 A gas recovery and filling device B gas insulated substation (device to be recovered) 1 recovery tank (recovery container) 4 two-stage compressor 16 vacuum pump 33 adsorption tower 52 pressure holding valve

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI F25J 1/00 F25J 1/00 A H02B 3/00 H02B 3/00 Q (58) Fields surveyed (Int. Cl. ⁷ , DB Name) H02B 13/02-13/075 H02B 3/00 B01D 53/26 F17C 7/00 F25B 45/00 F25J 1/00

Claims (1)

(57) [Claims] 1. A compressor for sucking and compressing gas from a device to be recovered, a recovery container for recovering the gas compressed by the compressor in a gas state or liquefied, and a gas for recovering the gas from the recovery container. A gas recovery and filling device comprising: an adsorption tower for storing an adsorbent for removing moisture in the gas when returning to the device to be recovered; and a vacuum for evacuating gas from the device to be recovered and sending it to the compressor side. A gas recovery and filling device, comprising: a pump; and a pressure holding valve provided in a pipeline between the adsorption tower and the device to be recovered, and maintaining a pressure on the adsorption tower side at a predetermined pressure.