CN211821724U

CN211821724U - Ultra-pure SF6 pipeline gas transmission system

Info

Publication number: CN211821724U
Application number: CN202020141680.XU
Authority: CN
Inventors: 徐军; 夏顺俊; 高亚平; 赵冬; 戴大海; 严垚; 夏睿; 田向阳
Original assignee: Jiangsu Power Transmission And Distribution Co ltd; State Grid Jiangsu Electric Power Co Ltd; Henan Pinggao Electric Co Ltd
Current assignee: Jiangsu Power Transmission And Distribution Co ltd; State Grid Jiangsu Electric Power Co Ltd; Henan Pinggao Electric Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-10-30
Anticipated expiration: 2030-01-22

Abstract

The utility model discloses a super high purity SF6 pipeline gas transmission system, a serial communication port, including automatic safety monitoring system, gas supply station room, intermediate station storage system and inflation system establish ties the intercommunication in proper order, and automatic safety monitoring system electricity is connected gas supply station room, intermediate station storage system and inflation system. The device takes out the liquid sulfur hexafluoride from the steel cylinder, realizes sulfur hexafluoride gasification in the equipment, and has high gasification speed and high heat exchange efficiency. Gas cylinder transportation is not needed in the pipe gallery, and cross operation with a GIL bus transportation and installation tool is avoided; practical operation proves that the inflation efficiency is 12 times of that of the traditional single-bottle inflation mode, the gas filling time is greatly shortened, and the problem of construction period bottleneck caused by the traditional inflation mode is effectively solved; thirdly, the sulfur hexafluoride gas cylinder is managed in a centralized manner on the ground, and safety risks are effectively managed and controlled.

Description

Ultra-pure SF6 pipeline gas transmission system

Technical Field

The utility model relates to an ultra-pure SF6 pipeline gas transmission system belongs to SF6 pipeline gas transmission technical field.

Background

GIL is a gas insulated metal enclosed pipeline bus transmission line, and sulfur hexafluoride switch equipment such as GIL and combined electrical appliances in the market needs to use a large amount of sulfur hexafluoride gas as an insulating and arc extinguishing medium when the sulfur hexafluoride switch equipment is installed in a power station on site. The sulfur hexafluoride gas is required to be detected before the gas is filled, the purity of the filled sulfur hexafluoride gas is required to be more than 99.9%, the moisture content is less than 5 mug/g, other miscellaneous gas indexes are required to meet the national standard requirements, and the requirement on the gas purity index is very high. According to the scale of the power station, the usage amount of sulfur hexafluoride gas is different, and the usage amount of sulfur hexafluoride gas in million-volt power stations and GIL pipe gallery installation sites is huge.

In the field installation process of the sulfur hexafluoride power station, two sulfur hexafluoride inflation modes are generally adopted, one mode is a single-bottle inflation mode, and the other mode is a multi-bottle group inflation mode.

1) Single bottle inflation mode

According to the traditional standard steel cylinder with the volume of 40L for field inflation, a single bottle of sulfur hexafluoride gas adopts a heating band heating inflation principle, sulfur hexafluoride is stored in the steel cylinder in a liquid state, and each standard 40L steel cylinder can store 50Kg of sulfur hexafluoride. When gas needs to be filled, the outlet of the gas cylinder is connected with a pressure reducer, a gas filling hose and a filter and then connected to GIL products, and as the liquid sulfur hexafluoride evaporates into a gaseous state in the gas cylinder during gas filling, the temperature in the steel cylinder is rapidly reduced, an outer wrapping type heating belt needs to be additionally arranged outside the steel cylinder to heat the steel cylinder.

The air inflation mode is suitable for transformer substations below 220kv, the air inflation amount of a single air chamber is not more than 200kg, and the air inflation device is used when the installation requirement is not tight. The defects of low inflation speed, low heat transfer speed of a heating belt and more residual gas in the gas cylinder are that the gas cylinder is only suitable for inflating a small gas chamber.

2) Adopts a multi-connected bottle group inflation mode

In the conventional inflation mode, for a transformer substation with an inflation capacity of more than 220kv or a single air chamber of more than 200kg, a multi-cylinder group mode is adopted as a more commonly used inflation mode, as shown in fig. 2. The specific operation steps are that a plurality of 40L steel cylinders are connected together by adopting a busbar, and then are connected with a GIL product air chamber through a pressure reducer, an inflation hose and a filter, and the rapid inflation is realized through a multi-cylinder parallel connection mode. The defects of the method are that the temperature and the pressure in the steel cylinder are sharply reduced after the liquid sulfur hexafluoride is gasified and cooled, the steel cylinder needs to be frequently replaced to meet the requirement of quick inflation, the original steel cylinder is continuously connected and inflated after the temperature returns to the room temperature, the labor intensity of workers is high, and the steel cylinder needs to be repeatedly replaced.

The two inflation modes are both sulfur hexafluoride gasification in the steel cylinder, and then the sulfur hexafluoride is gasified by heating the steel cylinder body by using the external environment, so that the gasification speed is low, and the heat transfer speed is low; in addition, sulfur hexafluoride gas in the gas cylinder is filled into the GIL gas chamber according to the pressure difference in the gas filling process, so that more residual gas is left in the gas cylinder, and a large amount of gas is wasted. Especially in the GIL pipe gallery, have characteristics such as operation face is narrow, installation distance is long, the cross construction is many, the potential safety hazard control point is many, workman intensity of labour is big, the gas consumption is huge. The traditional inflation mode is adopted, a large number of steel cylinders need to be transported to the interior of the pipe gallery for temporary storage, various construction vehicles are also transported to and fro in the interior of the pipe gallery, and the cross operation is serious; the transportation, storage and use of the gas cylinder are safe and have great risks; the difficulty of field organization and management is great; and because the traditional inflation mode has low gasification efficiency and low inflation speed, the installation period is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art's defect, provide a super high purity SF6 pipeline gas transmission system, adopt super high purity pipeline gas transmission system to solve the difficult problem of aerifing in the GIL installation in the piping lane.

In order to achieve the above object, the utility model provides an ultra-pure SF6 pipeline gas transmission system, including automatic safety monitoring system, gas supply station room, intermediate station storage system and inflation system establish ties the intercommunication in proper order, and automatic safety monitoring system electricity is connected gas supply station room, intermediate station storage system and inflation system.

Further, the gas supply station room comprises a plurality of gas supply bottles, a gasification heating system and a full-automatic gas switching system, wherein the gas supply bottles, the gasification heating system and the full-automatic gas switching system are sequentially communicated in series;

a plurality of gas supply bottle includes A group's gas cylinder and B group's gas cylinder, and A group's gas cylinder and B group's gas cylinder all include steel bottle, liquid phase pipe (10) and liquid phase export cylinder valve (11), and the bottleneck at the steel bottle is installed in liquid phase export cylinder valve (11), and the end intercommunication liquid phase export cylinder valve (11) of giving vent to anger of liquid phase pipe (10), and the inlet end of liquid phase pipe (10) stretches into inside the steel bottle.

Further, the intermediate station storage system comprises a gaseous high-pressure storage system, a low-pressure cache system, a residual gas recovery system, a low-pressure electronic pressure sensor VIS2, a low-pressure gauge, a high-pressure gauge, an electronic pressure sensor VIS2 and a plurality of valves, wherein the valves comprise a valve five, a valve six, a valve seven, a valve eight, a valve nine, a valve ten, a valve eleven and a valve twelve, a low-pressure gas outlet, a valve nine, a low-pressure cache system, a valve ten, a residual gas recovery system, a valve eleven, a gaseous high-pressure storage system and a valve twelve of the full-automatic gas switching system are sequentially communicated in series, a high-pressure gas outlet of the full-automatic gas switching system is communicated with a gas inlet of the valve eleven, the low-pressure gauge is communicated with the low-pressure cache system after being connected with the valve five in series, the low-pressure electronic pressure sensor VIS 63, the high-pressure gauge is connected with the gas high-pressure storage system after being connected with the valve eight in series, and the automatic safety monitoring system is electrically connected with the low-pressure electronic pressure sensor VIS2 and the electronic pressure sensor VIS 2.

Further, the full-automatic gas switching system comprises a high-pressure gas branch and a low-pressure gas branch, a high-pressure gas inlet of the high-pressure gas branch is communicated with the group A gas cylinder and the group B gas cylinder, a low-pressure gas inlet of the low-pressure gas branch is communicated with the group A gas cylinder and the group B gas cylinder, a high-pressure gas outlet of the high-pressure gas branch is communicated with the gaseous high-pressure storage system, and a low-pressure gas outlet of the low-pressure gas branch is communicated with the low.

Further, the high-pressure gas branch comprises a first valve, an electric ball valve DV1, an electric ball valve DV4, a one-way ball valve CV1, a one-way ball valve CV4, a first filter, a first sampling valve and a third filter, wherein the group A gas cylinders, the group A valve I, the electric ball valve DV1, the one-way ball valve CV1, the group A filter I, the group A valve III and the group B gas cylinders, the group B valve II, the electric ball valve DV4, the one-way ball valve CV4 and a gas inlet of the group A filter are sequentially communicated in series, and the automatic safety monitoring system is electrically connected with the electric ball valve DV1, the electric ball valve DV4 and the;

the low-pressure gas branch comprises a second valve, an electric ball valve DV2, an electric ball valve DV3, a one-way ball valve CV2, a one-way ball valve CV3, a second filter, a second sampling valve and a fourth valve, a group A gas cylinder, a first valve, an electric ball valve DV2, a one-way ball valve CV2, a second filter, a fourth valve and a low-pressure cache system are sequentially communicated in series, a group B gas cylinder, a second valve, an electric ball valve DV3, a one-way ball valve CV3 and a second filter are sequentially communicated in series, and the automatic safety monitoring system is electrically connected with the electric ball valve DV2, the electric ball valve DV3 and.

Further, the automatic safety monitoring system comprises a controller and a three-level pressure protection system, wherein the three-level pressure protection system comprises a mechanical pressure switch PS1, a mechanical pressure switch PS2, a mechanical pressure switch PS, a valve sixteen, a valve fifteen, a valve thirteen, an electric valve M, an electric valve MV1 and an electric valve MV2,

the controller is electrically connected with an electric valve M, an electric valve MV1, an electric valve MV2 and an electric valve MV3, the electric valve MV1 is connected in series between a low-pressure air outlet of the full-automatic gas switching system and an air inlet of a valve nine, a valve fifteen is connected in series with a mechanical pressure switch PS1 and then connected in parallel at two ends of the electric valve MV1, the electric valve M is connected in series between an air outlet of the residual gas recovery system and an air inlet of a valve eleven, a valve thirteen is connected in series with the mechanical pressure switch PS and then connected in parallel with the electric valve M, an electric valve MV2 is connected in series between a high-pressure air outlet of the full-automatic gas switching system and an air inlet of the valve eleven, and a mechanical pressure switch PS2 is.

Furthermore, the inflating system comprises a drying, purifying and pressure reducing system, a plurality of electric valves, a pressure protection system and a portable terminal inflating device, the electric valves are of a power-off self-resetting structure, the controller is electrically connected with the electric valves, the pressure protection system comprises a mechanical pressure switch PS3, a valve fourteen and an electric valve MV3, an air outlet of a valve twelve, the drying, purifying and pressure reducing system and the electric valve MV3 are sequentially communicated with air inlet ends of the electric valves, the mechanical pressure switch PS3 is connected with the valve fourteen in series and then connected with the electric valve MV3 in parallel, the electric valves are sequentially connected in series, an air inlet of the portable terminal inflating device is communicated with an air outlet of a first electric valve in the electric valves connected in series, and an air outlet of the portable terminal inflating device is communicated with external equipment; the inflation system also includes a portable leak alarm device mounted on the portable terminal inflation device.

Further, the drying, purifying and decompressing system comprises a first controller, a purifying and decompressing system, an on-line monitoring system for monitoring the purity of the purifying and decompressing system and an automatic gas regenerating system for recovering gas in the purifying and decompressing system, the purifying and decompressing system comprises a decompressing system and a drying and purifying system, the automatic gas regenerating system comprises a recovering system, a heating system and a vacuum purifying system, the on-line monitoring system, the decompressing system, the heating system, the recovering system, the heating system and the vacuum purifying system are all arranged on the drying and purifying system, and the first controller is electrically connected with the purifying and decompressing system, the on-line monitoring system and the automatic gas regenerating system;

the drying and purifying system comprises a V1 ball valve, an MV1 electric valve, a tower A, a moisture adsorbent, an MV2 electric valve, an MV5 electric valve, a connecting pipeline I and an F1 filter, a valve twelve, a V1 ball valve, an MV1 electric valve, a tower A, an MV2 electric valve, an MV5 electric valve and an F1 filter are sequentially communicated in series through the connecting pipeline I, the moisture adsorbent is arranged in the tower A, and a controller I is electrically connected with the MV1 electric valve, the MV2 electric valve and the MV5 electric valve; the tower A is a sealed tank body;

the pressure reducing system comprises a V4 ball valve, a PT1 pressure sensor, a PG1 pressure gauge, an REV1 pressure reducer, an MV6 electric valve, a pipeline II and a V2 ball valve, a connecting pipeline I between the V1 ball valve and the MV1 electric valve is communicated with an air inlet of the V4 ball valve, an air outlet of the V4 ball valve is communicated with a PT1 pressure sensor, the PG1 pressure gauge is connected to the PT1 pressure sensor in parallel, an F1 filter, an REV1 pressure reducer, the V2 ball valve and the electric valve MV3 are sequentially connected in series through the pipeline II, the MV6 electric valve is connected to two ends of the REV1 pressure reducer in parallel, and a controller I is electrically connected with the PT1 pressure sensor, the REV 58;

the drying and purifying system also comprises an MV3 electric valve, a B tower, an MV4 electric valve, a pipeline III and an MV8 electric valve, a first connecting pipeline between the V1 ball valve and the MV1 electric valve is communicated with an air inlet of the MV3 electric valve, an air outlet of the MV3 electric valve, the B tower and the MV4 electric valve are sequentially communicated in series through a pipeline III, a first connecting pipeline between the MV2 electric valve and the MV5 electric valve is communicated with an air outlet of the MV4 electric valve, the MV8 electric valve is communicated with the recovery system and the vacuum purification system, and a first controller is electrically connected with the MV3 electric valve, the MV4 electric valve and the MV8 electric valve; the tower B is a sealed tank body;

the recovery system comprises an MV7 electric valve, an MV9 electric valve and a recovery device, wherein a gas outlet of the tower A, the MV7 electric valve, the MV9 electric valve and the recovery device are sequentially communicated in series, a gas outlet of the MV8 electric valve is communicated with a gas inlet of the MV9 electric valve, and a first controller is electrically connected with the MV7 electric valve, the MV9 electric valve and the recovery device;

the vacuum purification system comprises an MV1O electric valve and a vacuum-pumping device, the MV7 electric valve, the MV1O electric valve and the vacuum-pumping device are sequentially communicated in series, the gas outlet of the MV8 electric valve is communicated with the gas inlet of the MV1O electric valve, and the first controller is electrically connected with the MV1O electric valve and the vacuum-pumping device;

the heating system comprises a plurality of HA heaters and a plurality of HB heaters, the HA heaters are arranged on the tower A, the HB heaters are arranged on the tower B, the online monitoring system comprises a temperature monitoring system, the temperature monitoring system comprises a T1 temperature controller I and a T2 temperature controller I, the T1 temperature controller I is electrically connected with the controller I, and the controller I is electrically connected with the HA heaters and the HB heaters;

the online monitoring system comprises a V3 ball valve, a pressure monitoring system and an SF6 online monitoring system, wherein the pressure monitoring system comprises a PT2 pressure sensor, a PG2 pressure gauge, a PT3 pressure sensor, a PG3 pressure gauge, a PT4 pressure sensor, a PG4 pressure gauge and a V5 ball valve, a second pipeline between an REV1 pressure reducer and the V1 ball valve is communicated and sequentially connected in series with the V1 ball valve and the SF 1 online monitoring system, a PT1 pressure sensor is installed on a tower A, the PG1 pressure gauge and the PT1 pressure sensor are connected in parallel, the PT1 pressure sensor is installed on a tower B, the PG1 pressure gauge and the PT1 pressure sensor are connected in parallel, the PT1 pressure sensor is communicated with the second pipeline between the REV1 pressure reducer and the V1 ball valve through the V1 ball valve, the PG1 pressure gauge and the PT1 pressure sensor are connected in parallel, the PT1 pressure sensor, the;

the on-line monitoring system comprises a purity monitoring system and a moisture detection system, and the purity detection system and the moisture detection system are electrically connected with the controller I.

Further, the portable terminal inflating device comprises an inflating system, a vacuumizing system and a leakage monitoring system, wherein the inflating system is used for conveying gas from the gas conveying system to the switch gas chamber, the vacuumizing system is used for vacuumizing gas in the inflating system, the leakage monitoring system is used for monitoring gas purity of the inflating system, the gas conveying system is communicated with the inflating system, the vacuumizing system is communicated with the inflating system, the leakage detecting system is communicated with the inflating system, and the controller is electrically connected with the inflating system, the vacuumizing system and the leakage detecting system;

the gas charging system comprises a filtering system for filtering gas, a pressure reducing system and a dust filter for filtering dust, and the gas transmission system, the filtering system, the pressure reducing system and the dust filter are sequentially communicated in series;

the filter system comprises a first connecting hose, a DV1 electric valve and an F1 filter, wherein an air outlet of a first electric valve in a plurality of series-connected electric valves, a DV1 electric valve and the F1 filter are sequentially connected in series through the first connecting hose, and a controller is electrically connected with the DV1 electric valve and the F1 filter;

the pressure reducing system comprises a second connecting hose, a REV1 pressure reducer, a DV2 electric valve and a DV3 electric valve, wherein an F1 filter, a REV1 pressure reducer, a DV3 electric valve, a dust filter and GIL equipment are sequentially communicated in series through the second connecting hose, and the DV2 electric valve is connected to the REV1 pressure reducer in parallel;

the device comprises a flow meter, wherein the flow meter is arranged between a REV1 pressure reducer and a DV3 electric valve, and a controller is electrically connected with a dust filter, the flow meter, the REV1 pressure reducer, the DV2 electric valve and the DV3 electric valve;

the vacuumizing system comprises a third connecting hose, a DV4 electric valve and a VP1 vacuum pump, a second connecting hose between the DV3 electric valve and the dust filter is communicated with an air inlet of the DV4 electric valve, an air outlet of the DV4 electric valve is communicated with the VP1 vacuum pump, and the controller is electrically connected with the DV4 electric valve and the VP1 vacuum pump;

the leakage monitoring system comprises an air inlet pressure detection system, an air outlet pressure monitoring system, an air purity detection system and an oxygen content detection system, wherein the air inlet pressure detection system comprises a PT1 pressure sensor, a PG1 pressure gauge and a first ball valve, a connecting hose between the air transmission system and the DV1 electric valve is communicated with an air inlet of the first ball valve, an air outlet of the first ball valve is communicated with a PT1 pressure sensor, the PT1 pressure sensor is connected with the PG1 pressure gauge in parallel, and a controller is electrically connected with a PT1 pressure sensor;

the air outlet pressure monitoring system comprises a PT2 pressure sensor, a PG2 pressure meter and a second ball valve, a second connecting hose between the DV3 electric valve and the dust filter is communicated with an air inlet of the second ball valve, an air outlet of the second ball valve is communicated with a PT2 pressure sensor, the PG2 pressure meter and the PT2 pressure sensor are connected in parallel, and the controller is electrically connected with the PT2 pressure sensor;

the controller is electrically connected with the gas purity detection system and the oxygen content detection system;

the sound and light alarm system comprises an alarm flash lamp and a loudspeaker, and the alarm flash lamp and the loudspeaker are electrically connected with the controller.

The gas outlet of the drying, purifying and pressure reducing system is connected with the gas inlet of the recovery system after being connected with an electric valve MV3 in series, and the gas outlet of the recovery system is communicated with the gas inlet of the recovery gas cylinder; the air inlet of the portable front recovery device is communicated with external equipment, and the air outlet of the portable front recovery device is communicated with the air inlet of the last electric valve in the plurality of series-connected electric valves.

The utility model discloses the beneficial effect who reaches:

compared with the traditional gas filling mode, the sulfur hexafluoride gasification mode in the gas cylinder is different, the device takes the liquid sulfur hexafluoride out of the steel cylinder, realizes sulfur hexafluoride gasification in the equipment, and has high gasification speed and high heat exchange efficiency. The scheme of the ultra-pure SF6 pipeline gas transmission system effectively solves the following problems: firstly, gas cylinder transportation is not needed in the pipe gallery, and the operation of mutual crossing with a GIL bus transportation and installation tool is avoided; actual operation proves that the inflation efficiency is 12 times of that of the traditional single-bottle inflation mode, the gas filling time is greatly shortened, and the problem of construction period bottleneck caused by the traditional inflation mode is effectively solved; thirdly, sulfur hexafluoride gas cylinders are managed on the ground in a centralized manner, so that safety risks are effectively managed and controlled; fourthly, the system adopts a full-automatic control mode, a multi-level safety control mode is set, and the safety of equipment and personnel is guaranteed; fifthly, 1/4 with the number of workers being only the traditional inflation mode effectively saves labor cost and greatly reduces labor intensity of workers.

Drawings

FIG. 1 is a schematic illustration of a prior art single bottle inflation system;

FIG. 2 is a schematic diagram of a multi-connected bottle group inflation method in the prior art;

fig. 3 is a schematic diagram of the present invention;

FIG. 4 is a structural diagram of the gas cylinder of the present invention;

FIG. 5 is a schematic view of the group A and group B cylinders of FIG. 3 operating to automatically replenish the gaseous pressurized canister;

FIG. 6 is a schematic illustration of the inflation of the GIL plenum of FIG. 3;

FIG. 7 is a schematic illustration of gas recovery within the GIL gas cell of FIG. 3;

fig. 8 is a schematic view of a leakage alarm device according to the present invention;

fig. 9 is a schematic view of a second embodiment of the present invention;

FIG. 10 is a gas path diagram of the gasification heating system of the present invention;

fig. 11 is a gas circuit diagram of the fully automatic gas switching system of the present invention;

FIG. 12 is a schematic view of a drying, purifying and pressure reducing system according to the present invention;

fig. 13 is a schematic view of a portable terminal inflation device of the present invention.

Labeled meanings in the attached figures, 1-GIL gas cell; 2-a dust filter; 3-an inflation hose; 4-a pressure reducer; 5-a sulfur hexafluoride gas cylinder; 6-an outer wrapped heating tape; 7-a busbar; 8-multi-connected bottle group; 9-liquid taking port; 10-a liquid phase conduit; 11-liquid phase outlet cylinder valve; 12-liquid SF 6.

Detailed Description

The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example one

An ultra-pure SF6 pipeline gas transmission system comprises an automatic safety monitoring system, a gas supply station room, an intermediate station storage system and an inflation system, wherein the gas supply station room, the intermediate station storage system and the inflation system are sequentially communicated in series, and the automatic safety monitoring system is electrically connected with the gas supply station room, the intermediate station storage system and the inflation system.

The working process of the drying, purifying and decompressing system comprises the following steps:

the F1 filter function is for filtering impurity such as dust, moisture and SF6 decomposition thing, and purity monitoring system monitoring content includes the purity of SF6 gas, the purity of steam and other impurity gas's purity, and other impurity gas includes air, carbon tetrafluoride, hexafluoroethane, octafluoropropane, hydrogen fluoride, mineral oil etc..

Purity detection system, moisture detection system, vacuum-pumping device, recovery device, SF6 on-line monitoring system, PT2 pressure sensor, PG2 pressure gauge, PT3 pressure sensor, PG3 pressure gauge, PT4 pressure sensor, PG4 pressure gauge, V5 ball valve, V3 ball valve, HA heater, HB heater, MV1O electric valve, MV7 electric valve, MV9 electric valve, MV3 electric valve, MV4 electric valve, pipe three, MV8 electric valve, V4 ball valve, PT1 pressure sensor, PG1 pressure reducer pressure gauge, REV1, MV6 electric valve, pipe two, V2 ball valve, controller, V1, MV1 electric valve, moisture adsorbent, MV2 electric valve, MV5 electric valve, connecting pipe one, HA-1 heater, HA-2 heater, HA-3 heater, HB-1 heater, HB-2 heater, HB-3 heater and F1 are adopted in the existing technology, the model can be selected by the person skilled in the art according to the actual requirement.

PT denotes a pressure sensor, PG denotes a pressure gauge, F denotes a filter, MV denotes an electric ball valve, REV denotes a pressure reducing valve, and V denotes a ball valve.

The schematic diagram of dry purification depressurization system is shown in fig. 12, the utility model discloses according to SF6 gas transmission system characteristics, have SF6 gas purity on-line monitoring, dry purification, vacuum purification regeneration function, design pressure reducer and MV6 electric valve simultaneously, when equipment inlet pressure is less than the pressure reducer and sets up the pressure value, bypass valve: the MV6 electric valve is automatically opened to accelerate the gas supply flow, and all functions of the gas are fully-automatic control operation.

And (3) a purification and pressure reduction process of the drying and purification pressure reduction system:

the device adopts tower A and tower B as one use and one standby, and the process is described by taking tower A as an example and tower B as an example. When the equipment works, if the pressure of the air inlet PT1 is higher than the air outlet set value of the REV1 pressure reducer D, SF6 gas firstly enters the device from the air inlet, passes through a V1 ball valve, an MV1 electric valve, A tower adsorption and purification, MV2, MV5 and F1 dust filtration and REV1 pressure reducer pressure reduction, and then flows out through a V2 valve.

As shown in FIG. 3, when inlet port pressure PT1 falls below the decompressor set point, the decompressor bypass valve MV6 automatically opens increasing gas inlet flow.

The automatic gas regeneration process of the drying, purifying and depressurizing system comprises the following steps:

the device is integrated with an SF6 online monitoring system, various indexes such as SF6 gas outlet purity, moisture and the like are automatically monitored in real time, when the monitored indexes are lower than an alarm set value, the SF6 online monitoring system gives a command, the MV1 and MV2 valves are automatically closed, the MV3 and MV4 valves are automatically opened, and automatic switching from the tower A to the tower B is realized.

A. After the switching of the tower B is finished, the MV7, the MV9 and the recovery device automatically operate, and the SF6 gas in the tower A is completely recovered. And detecting the pressure PT2 in the tower A, and when the pressure in the tower A reaches a set value, automatically closing the MV9 valve and stopping the operation of the recovery device.

After SF6 gas recovery is completed, the MV9 valve is automatically closed, the MV10 valve is automatically opened, the vacuumizing device automatically operates, and the molecular sieve in the tower A is vacuumized. Meanwhile, heaters HA-1, HA-2 and HA-3 on the tower A are automatically started to heat the tower A, and the temperature of the tower A is automatically controlled within a set value range by a T1 temperature controller. The vacuum heating regeneration function begins.

And when the vacuum heating regeneration function of the tower A reaches the set time t, the heating regeneration function is finished, and the MV7, the MV10, the vacuumizing device and the heater of the adsorption tower A are all automatically stopped, and the automatic cooling process of the tower A is started. By detecting the temperature T1, when the temperature reaches a set value, MV2 automatically opens and enters qualified SF6 gas for pressure maintaining, when PT2 reaches a set value, an MV2 valve automatically closes, and the tower A enters a standby program.

A gas purity detection system, an oxygen content detection system, a controller, a dust filter, a DV1 electric valve, an F1 filter, a REV1 pressure reducer, a DV2 electric valve, a DV3 electric valve, a flow meter, a DV4 electric valve, a VP1 vacuum pump, a PT1 pressure sensor, a PG1 pressure gauge, a ball valve I, a PT2 pressure sensor, a PG2 pressure gauge and a ball valve II in the portable terminal inflation device are of various types which can be adopted in the prior art, and can be selected by a person skilled in the art according to actual requirements.

Among the portable terminal inflation device is the inflation device who connects between SF6 gas transmission pipeline and the switch air chamber, has evacuation, SF6 gas filtration, decompression, flow measurement, the online monitoring of gas index, leakage monitoring and alarm function.

The workflow in the portable terminal inflator is as follows:

vacuumizing: the negative pressure recovery pump and the controller are arranged, the device is firstly vacuumized before inflation, the method that air can only be replaced by releasing SF6 gas when air in an inflation hose needs to be discharged before the traditional inflation is avoided, the SF6 gas is prevented from being discharged outwards, and the device is environment-friendly. All the electric valves are opened through the controller, then the DV4 electric valve and the VP1 vacuum pump are opened to vacuumize the first connecting hose, the second connecting hose and the third connecting hose, and the air in the device is exhausted into the outside air.

Filling air into the switch air chamber: when the pressure of the SF6 gas transmission system is higher than the set value of the REV1 pressure reducer, when the switch air chamber needs to be inflated, the switch air chamber is firstly connected with a SF6 gas transmission system pipeline through the device, and SF6 gas in the pipeline is inflated to the switch air chamber through the DV1 electric valve, the REV1 pressure reducer, the F1 filter, the flowmeter, the DV3 electric valve and the dust filter.

As shown in fig. 13, when the SF6 gas delivery system pressure is below the REV1 pressure reducer set point, the REV1 pressure reducer bypass valve DV2 electrically operated valve automatically opens, increasing the flow of SF6 gas.

The F1 filter function is for filtering impurity such as dust, moisture and SF6 decomposition thing, and gas purity monitoring system monitoring content includes the purity of SF6 gas, steam and other impurity gas, and other impurity gas includes air, carbon tetrafluoride, hexafluoroethane, octafluoropropane, hydrogen fluoride, mineral oil etc..

And in the inflation process, the flow of the inflated SF6 gas is automatically measured through a flowmeter and recorded in a PLC program of the controller for judging the inflation quantity. Detecting whether the pressure of the air inlet end and the pressure of the air outlet end of the device are consistent through PT1 and PT2 to judge whether leakage exists, presetting inflation pressure values or two indexes of inflation quantity by a controller, calculating the inflation quantity of the device through a flowmeter, and automatically stopping and recording the inflation function when the inflation quantity or the inflation pressure in a switch air chamber reaches a set value;

a pressure sensor is arranged in the switch air chamber, the controller is electrically connected with the pressure sensor, the valve is closed to be static after the air is inflated to a dynamic value t1, the static value of the inflation pressure is measured, the inflation time t2 is continued if the static value of the inflation pressure does not reach a set value, and the actions are continuously repeated until the static value of the inflation pressure reaches the set value after t2 is finished.

Meanwhile, the device is provided with an SF6 gas index on-line monitoring system, when the filled SF6 gas index can not meet the requirements at best or the filling pressure can not meet the requirements, the filling process can be automatically stopped and a sound and light alarm prompt is given, the risk that the filling index cannot be monitored in the traditional filling mode is avoided, and all gas in the gas chamber needs to be recycled and reprocessed after the index is found to be not up to the standard.

The portable SF6 leakage alarm device is arranged in the device, the SF6 concentration value and the oxygen content value at the position of the device can be monitored, and when the SF6 leakage or the low oxygen content at the position of the device is detected, the inflation process is automatically stopped, and an alarm prompt is given. The problem that personnel cannot timely perceive unsafe environmental factors such as leakage and the like in the inflating process in the traditional inflating mode is solved.

The principle and technical general diagram of the ultra-pure SF6 pipeline gas transmission system is shown in fig. 3, the ultra-pure SF6 pipeline gas transmission system is composed of a ground SF6 gas centralized gas supply station room and a sulfur hexafluoride gas transmission pipeline system in a lower pipe gallery, and is system integration integrating functions of gas heat exchange, pressurization, depressurization, centralized storage, drying and purification, pipeline transmission, safety monitoring and the like, so that SF6 gas centralized management and production organization are facilitated, the problem of difficulty in transportation of gas cylinders in the pipe gallery is solved, and the gas inflation speed and safety risk management and control can be effectively improved.

The ultra-pure SF6 pipeline gas transmission system has the main functions:

1) the liquid SF6 is conveyed into system equipment by utilizing a specially designed steel cylinder structure;

2) converting liquid SF6 gas into SF6 high-pressure gas at normal temperature, and simultaneously setting two paths of gas supply to ensure that the gas supply process is uninterrupted;

3) the SF6 in the gas cylinder is completely recycled by using system equipment, so that the waste of SF6 gas is avoided;

4) filling SF6 gas meeting the requirement into the GIL gas chamber by using a portable terminal inflating device;

5) recycling gas in the GIL equipment by utilizing a portable preposed recycling device;

6) and the safety monitoring of the pressure of each gas in the SF6 system is realized.

The gasification heating system is an insulating gas processing device disclosed in patent ZL 201820253464.7.

The gaseous high-pressure storage system is the prior art, can be understood as a system formed by connecting one or more high-pressure gas storage bottles in parallel, and is provided with a safety valve, a pressure gauge, a pressure sensor and a sulfur hexafluoride purity and moisture online monitoring instrument;

the low-pressure cache system is a system formed by connecting one or more low-pressure gas storage bottles in parallel, and is provided with a safety valve, a pressure gauge, a pressure sensor, a sulfur hexafluoride purity and moisture online monitoring instrument and the like;

the residual gas recovery system is the prior art, and is a model LH-57Y/18WG type SF6 recovery device or equivalent parameter equipment;

the recovery system is the prior art, model LH-57Y/18WG type recovery device or similar parameter equipment;

the types of portable leak alarm devices available in the prior art can be selected by those skilled in the art as desired; the portable front-end recovery unit is a prior art, model LH-80QW or similar parametric device.

The utility model discloses creative proposition has adopted super high purity pipeline gas transmission system to solve the difficult problem of aerifing in the GIL installation in the piping lane. The working mode is that an inflation station house is built on the ground, sulfur hexafluoride gas cylinders are stored in the ground station house in a centralized mode, the gasification work of sulfur hexafluoride gas is achieved on the ground, and then the sulfur hexafluoride to be inflated is stored in a gas storage tank of the ground station house in a gas mode. A high-purity sulfur hexafluoride gas transmission pipeline is laid in the pipe gallery, and sulfur hexafluoride in the gas tank is purified and decompressed and then is transmitted to each gas filling operation point in a gas state. When the GIL air chamber in the pipe gallery needs to be inflated, sulfur hexafluoride is filtered and decompressed by the matched inflating device and then is inflated into the GIL air chamber. The external equipment is GIL equipment.

SF 6-sulfur hexafluoride (sulfur hexafluoride) is a colorless, odorless, nontoxic, nonflammable stable gas, and is widely used as an insulating medium for high-voltage electrical equipment.

GIL-gas insulated metal enclosed pipeline bus transmission line.

GIS-gas insulated metal enclosed switchgear.

Example two

Different from the first embodiment, as shown in fig. 9, the steel cylinders of the group a and the group B can also adopt a structure in which a plurality of standard 40L steel cylinder groups are connected in series and then are placed obliquely to fill SF6 liquid, but the solution has a high labor intensity and is inconvenient for equipment hoisting and transportation, and can realize a liquid taking function.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims

1. The ultra-pure SF6 pipeline gas transmission system is characterized by comprising an automatic safety monitoring system, a gas supply station room, an intermediate station storage system and an inflation system, wherein the gas supply station room, the intermediate station storage system and the inflation system are sequentially communicated in series, and the automatic safety monitoring system is electrically connected with the gas supply station room, the intermediate station storage system and the inflation system.

2. The ultra-high-purity SF6 pipeline gas transmission system of claim 1, wherein the gas supply station room comprises a plurality of gas supply bottles, a gasification heating system and a fully automatic gas switching system, the plurality of gas supply bottles, the gasification heating system and the fully automatic gas switching system are connected in series in sequence;

3. The ultra-high-purity SF6 pipeline gas transmission system of claim 2, wherein the intermediate station storage system comprises a gaseous high pressure storage system, a low pressure buffer system, a residual gas recovery system, a low pressure electronic pressure sensor VIS2, a low pressure gauge, a high pressure gauge, an electronic pressure sensor VIS2 and a plurality of valves, the plurality of valves comprise a valve five, a valve six, a valve seven, a valve eight, a valve nine, a valve ten, a valve eleven and a valve twelve, a low pressure outlet of the fully automatic gas switching system, a valve nine, a low pressure buffer system, a valve ten, a residual gas recovery system, a valve eleven, a gaseous high pressure storage system and a valve twelve are connected in series in sequence, a high pressure outlet of the fully automatic gas switching system is connected with a gas inlet of the valve eleven, a low pressure gauge is connected with the low pressure buffer system after being connected with the valve five in series, a low pressure electronic pressure sensor VIS2 is connected with, the electronic pressure sensor VIS2 is connected with the gas state high pressure storage system after being connected with the seventh valve in series, the high pressure gauge is connected with the gas state high pressure storage system after being connected with the eighth valve in series, and the automatic safety monitoring system is electrically connected with the low-voltage electronic pressure sensor VIS2 and the electronic pressure sensor VIS 2.

4. The ultra-high-purity SF6 pipeline gas transmission system of claim 3, wherein the fully automatic gas switching system includes a high pressure gas branch and a low pressure gas branch, the high pressure gas inlet of the high pressure gas branch is connected to group A gas cylinders and group B gas cylinders, the low pressure gas inlet of the low pressure gas branch is connected to group A gas cylinders and group B gas cylinders, the high pressure gas outlet of the high pressure gas branch is connected to the gaseous high pressure storage system, and the low pressure gas outlet of the low pressure gas branch is connected to the low pressure buffer system.

5. The ultra-high-purity SF6 pipeline gas transmission system of claim 4, wherein the high-pressure gas branch comprises a first valve, a motorized ball valve DV1, a motorized ball valve DV4, a one-way ball valve CV1, a one-way ball valve CV4, a first filter, a first sampling valve and a third valve, the gas cylinders in group A, the first valve, the motorized ball valve DV1, the one-way ball valve CV1, the first filter, the third valve and the high-pressure gas storage system are sequentially communicated in series, the gas cylinders in group B, the second valve, the motorized ball valve DV4, the one-way ball valve CV4 and the gas inlet of the first filter are sequentially communicated in series, and the automatic safety monitoring system electrically connects the motorized ball valve DV1, the motorized ball valve DV4 and;

6. The ultra-high-purity SF6 pipeline gas delivery system of claim 3, wherein the automated safety monitoring system includes a controller and a three-stage pressure protection system, the three-stage pressure protection system includes a mechanical pressure switch PS1, a mechanical pressure switch PS2, a mechanical pressure switch PS, a valve sixteen, a valve fifteen, a valve thirteen, an electrically operated valve M, an electrically operated valve MV1 and an electrically operated valve MV2,

7. The ultra-high-purity SF6 pipeline gas delivery system of claim 3, wherein the gas charging system comprises a dry cleaning pressure reduction system, a plurality of electrically operated valves, a pressure protection system and a portable end gas charging device, the plurality of electrically operated valves are in a power-off self-resetting configuration, the controller is electrically connected to the plurality of electrically operated valves, the pressure protection system comprises a mechanical pressure switch PS3, the air outlet of the valve twelve, the drying, purifying and pressure reducing system and the electric valve MV3 are sequentially communicated with the air inlet ends of a plurality of electric valves, the mechanical pressure switch PS3 is connected with the valve fourteen in series and then connected to the electric valve MV3 in parallel, the electric valves are sequentially connected in series, the air inlet of the portable terminal inflating device is communicated with the air outlet of the first electric valve in the plurality of electric valves connected in series, and the air outlet of the portable terminal inflating device is communicated with external equipment; the inflation system also includes a portable leak alarm device mounted on the portable terminal inflation device.

8. The ultra-high purity SF6 pipeline gas transmission system of claim 7, wherein the dry purification pressure reduction system comprises a first controller, a purification pressure reduction system, an on-line monitoring system for monitoring the purity of the purification pressure reduction system, and an automatic gas regeneration system for recovering the gas in the purification pressure reduction system, the purification pressure reduction system comprises a pressure reduction system and a dry purification system, the automatic gas regeneration system comprises a recovery system, a heating system and a vacuum purification system, the on-line monitoring system, the pressure reduction system, the heating system, the recovery system, the heating system and the vacuum purification system are all installed on the dry purification system, and the first controller is electrically connected with the purification pressure reduction system, the on-line monitoring system and the automatic gas regeneration system;

9. The ultra-high purity SF6 pipeline gas delivery system of claim 7, wherein the portable terminal gas filling device comprises a gas filling system for delivering gas from the gas delivery system to the switching plenum, a vacuum system for evacuating gas in the gas filling system, and a leak detection system for monitoring gas purity of the gas filling system, the gas delivery system is in communication with the gas filling system, the vacuum system is in communication with the gas filling system, the leak detection system is in communication with the gas filling system, the controller is in electrical communication with the gas filling system, the vacuum system, and the leak detection system;

10. The ultra-high purity SF6 pipeline gas transmission system of claim 1, further comprising a recovery unit, wherein the recovery unit comprises a recovery system, a recovery gas cylinder and a portable pre-recovery unit, the gas outlet of the drying, purifying and pressure reducing system is connected in series with an electric valve MV3 and then is communicated with the gas inlet of the recovery system, and the gas outlet of the recovery system is communicated with the gas inlet of the recovery gas cylinder; the air inlet of the portable front recovery device is communicated with external equipment, and the air outlet of the portable front recovery device is communicated with the air inlet of the last electric valve in the plurality of series-connected electric valves.