CN114289419B - Gas purging and cleaning system and method for gas insulated transmission line - Google Patents
Gas purging and cleaning system and method for gas insulated transmission line Download PDFInfo
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Abstract
The invention provides a gas purging and cleaning system and a gas purging and cleaning method for a gas insulated transmission line, which comprises a first gas isolation unit of the gas insulated transmission line to be purged, wherein a first bottom hand hole of the first gas isolation unit is communicated with a second bottom hand hole of a second gas isolation unit through a communication pipeline; the second top hand hole of the second air separation unit is communicated with a dry air compressor for supplying air; a gas flowmeter, a first pressure gauge and a valve are sequentially arranged on a communication pipeline between the second bottom hand hole and the first bottom hand hole; and the first air isolating unit is communicated with a second pressure gauge. The gas barrier unit which is formed by flange connection or welding and has the length of dozens of meters or hundreds of meters can be completely blown, and the problem that internal dust or metal particles cannot be cleaned in the installation or maintenance process of the gas insulated transmission line is solved.
Description
Technical Field
The invention belongs to the technical field of gas insulation transmission line cleaning, and particularly relates to a gas purging and cleaning system and method for a gas insulation transmission line.
Background
A gas insulated transmission line (GIL) adopts a linear unit of several meters or more than ten meters or the linear unit and other compensation units, corner units and the like to form a gas insulated unit with the length of dozens of meters or more than one hundred meters by flange connection or welding, and the gas insulated unit is connected into a longer line by flanges. An air-proof unit can be simplified into a pipeline of dozens of meters or hundreds of meters, a conductor is concentrically arranged in the pipeline, an annular cavity is formed between the pipeline and the conductor, the conductor is fixed on the pipeline through an insulator with a ventilation function, and insulators for isolating gas are arranged at two ends of the pipeline. When the gas insulation transmission line is installed, generally in some tunnels, the environmental conditions in the tunnels inevitably have some dust, and after dustproof measures are taken to meet the standard, the dust is reduced, but still, even if measures such as dustproof sheds and protective covers are further taken, the dust or metal particles cannot fall into the shell of the gas insulation transmission line when the gas insulation transmission line is installed, and the shell adopts the welded gas insulation transmission line, so that the construction difficulty is higher, and the possibility of falling into the dust or the metal particles in the installation is higher. Once these impurities fall into the inside of the outer shell of the gas insulated transmission line, the impurities may fall on the inner wall of the outer shell of the gas insulated transmission line which is horizontally installed or on the inner insulator of the gas insulated transmission line which is vertically installed, and the insulation performance of the gas insulated transmission line will be greatly affected. Some impurities may cause test flashover during the GIL post-installation test, thereby being detected early, but also increasing the time of installation. And some impurities generate grounding short circuit in later-stage operation, so that equipment cannot continue to operate and needs to be overhauled. In the process of installing various GILs, only hand holes at two ends of the GIL air isolating unit can be cleaned, the cleaning is very limited, and some GILs have no hand holes and cannot be cleaned. For a gas insulated transmission line which needs to be extremely clean, impurities such as dust or metal particles cannot be tolerated to fall into the gas insulated transmission line, and although various methods are adopted in construction, the gas insulated transmission line cannot cope with the newly-entered impurities such as dust or metal particles after the gas insulated unit is assembled.
The use of a clean, dry gas purge is clearly important for cleaning the inside of the GIL. Some enterprises in China have already developed the work of gas purging. The existing GIL installation and maintenance gas purging operation method is to fill dry air with pressure specified by a manufacturer in a sealing test into a GIL tubular shell, close an inflating device after the inflation is finished, and deflate through a gas operation interface on a hand hole cover plate at one end of a GIL air isolating unit (some enterprises can also carry out repeated inflation and purging). Even with the enlarged exhaust port, the gas flow rate in the GIL away from the bleed interface gradually decreases to zero and does not effectively purge the GIL.
If the requirements for gas purging in the national standard industrial metal pipeline engineering construction specification are referred, namely the air purging is suitable for carrying out discontinuous purging by using a large-scale air compressor or a large-scale air storage tank of a factory production device, the purging pressure is not more than the design pressure of a system container and a pipeline, and the purging flow speed is not less than 20m/s. However, the national standard also requires that various components such as a pore plate in the pipeline and the like are removed before purging is performed, the insulation basin in the GIL pipeline and the insulators at two ends of each air separation unit cannot be removed, and the gas channel at the insulators in some GIL air separation units is small, so that the specification cannot be performed, and even if the whole phase GIL is not purged, the same problem is also faced when only a single air separation unit is purged. There is no method for where the gas enters or exits, and there is no method for determining the proper flow rate of the gas, whether the gas can blow out impurities, and how clean the gas can be purged.
Disclosure of Invention
The invention aims to provide a gas purging and cleaning system and a gas purging and cleaning method for a gas insulated transmission line, which can purge a gas barrier unit which is formed by flange connection or welding and has a length of dozens of meters or hundreds of meters, and solve the problem that the gas insulated transmission line cannot clean internal dust or metal particles in the installation or maintenance process.
In order to achieve the technical characteristics, the invention aims to realize that: the gas purging and cleaning system for the gas insulation transmission line is characterized by comprising a first gas isolation unit of the gas insulation transmission line to be purged, wherein a first bottom hand hole of the first gas isolation unit is communicated with a second bottom hand hole of a second gas isolation unit through a communication pipeline;
a second top hand hole of the second air isolation unit is communicated with a dry air compressor for supplying air;
a gas flowmeter, a first pressure gauge and a valve are sequentially arranged on a communication pipeline between the second bottom hand hole and the first bottom hand hole;
and the first air isolating unit is communicated with a second pressure gauge.
And the gas flowmeter, the first pressure gauge and the second pressure gauge are connected with a computer through signal lines.
The first top hand hole outlet part at the top of the first air isolation unit is provided with a target plate for detecting whether to clean up the air, and white soft rubber for adsorbing dust is pasted on the target plate.
The second air-separating unit for communicating with the dry air compressor and for storing high-pressure air can also select an adjacent air-separating unit or an external air storage tank.
The communicating pipeline is connected to the orifice flanges of the hand hole, the gas operation hole, the gas density relay hole or the explosion-proof membrane hole on the corresponding first gas isolation unit or the second gas isolation unit, and the sealing and the fixed connection are ensured; and one end with the larger sum of the cross-sectional areas of the holes is used as a purging outlet.
The valve adopts a quick-opening valve so as to reduce energy waste in the valve opening process.
The expansion and contraction of the inner flow passage of the communicating pipeline or the smooth transition of the branch position are required.
When the adjacent air separation units are used as the air source container, the highest air pressure value in the air source container is the rated pressure value or the highest working pressure value designed by the air separation units, and when the air storage tank is used as the air source container, the air source end pressure of the air separation units is not greater than the rated pressure designed by the air separation units;
when one or more air separation units are purged at a time, the air separation units are connected by a temporary short pipe.
The method for cleaning the gas insulated transmission line by adopting the gas purging and cleaning system of the gas insulated transmission line comprises the following steps:
step one, storing high-pressure gas for cleaning:
closing the valve, starting the dry air compressor, inflating the second air-insulated unit through the dry air compressor, monitoring the pressure P of compressed gas in the second air-insulated unit in real time through a first pressure gauge in the inflation process, and closing the dry air compressor when the value of the pressure P of the compressed gas exceeds the designed rated pressure value of the second air-insulated unit so as to finish the storage of high-pressure gas;
step two, purging and cleaning the first air separation unit to be cleaned by adopting stored high-pressure gas:
after the second air separation unit is completely inflated, the valve is opened, high-pressure gas enters the first air separation unit from the valve, and the first air separation unit is subjected to gas purging;
step three, detecting whether the first air separation unit is clean:
and when the purging time is not less than t seconds, placing a target plate covered with white soft rubber at the position of a second top hand hole of the air outlet of the first air separation unit, wherein the white soft rubber is free of dust and metal particle impurities, namely the purging is qualified, and if the purging is unqualified, continuing to purge until the purging is qualified.
In the purging process, reading Q of the gas flowmeter through a computer, reading P of a first pressure gauge, reading S of the cross section area of an internal flow passage of the gas barrier unit, wherein S is a known quantity, and reading P of a second pressure gauge 1 And calculating to obtain the minimum speed of the airflow in the first air separation unit:
V i =Q×P÷S÷P 1 （1）
when V is i When the total length of the first air separation unit is greater than or equal to 5.5m/s, the total length of the first air separation unit is s, the shortest time of single or multiple times of total purging is t, and when the sum of sigma (V) is satisfied i * Δ t) ≧ s, where i =1,2, \ 8230, n, where V i And (3) calculating speed values at different moments for the computer, wherein delta t is the interval between two adjacent moments, the time t = n x delta t, the time t is calculated by the computer, and the purging time is not less than t seconds.
The invention has the following beneficial effects:
1. the system provided by the invention considers the structural characteristics of various different types of gas-insulated transmission lines, and can be used for gas purging and cleaning of various different types of gas-insulated transmission lines. The purging inlet and outlet of the gas insulated transmission line are regulated, the proper gas purging speed is selected, the requirement of purging on equipment is lowered, and the problem that impurities such as dust and metal particles fall into the gas insulated transmission line during installation in the prior art cannot be cleaned is solved. The minimum purging speed is measured, so that no dead angle is purged in the gas insulated transmission line, and energy waste is reduced.
2. The gas purging cleaning method considers the actual situation of impurities in the gas insulation power transmission line, so that the minimum speed of the purging gas flow is 5.5m/s, the complexity of calculating the gas purging speed of the impurities with different shapes on the wall surface is avoided, the energy waste is reduced, and the safety and the realizability are improved.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a system diagram of the present invention.
In the figure: the device comprises a first air separation unit 1, a second air separation unit 2, a communicating pipeline 3, a dry air compressor 4, a valve 5, a gas flowmeter 6, a first pressure gauge 7, a second pressure gauge 8, a computer 9, white soft rubber 10 and a target plate 11;
a first bottom hand hole 101, a first top hand hole 102;
a second bottom hand hole 201, a second top hand hole 202.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1, the gas purging and cleaning system for the gas insulated transmission line comprises a first gas isolation unit 1 of the gas insulated transmission line to be purged, wherein a first bottom hand hole 101 of the first gas isolation unit 1 is communicated with a second bottom hand hole 201 of a second gas isolation unit 2 through a communication pipeline 3; the second top hand hole 202 of the second air-separating unit 2 is communicated with a dry air compressor 4 for supplying air; a gas flowmeter 6, a first pressure gauge 7 and a valve 5 are sequentially arranged on the communication pipeline 3 between the second bottom hand hole 201 and the first bottom hand hole 101; and the first air isolating unit 1 is communicated with a second pressure gauge 8. By adopting the purging and cleaning system, one gas barrier unit of the gas insulated transmission line is used as a gas storage unit of high-pressure gas, and the gas storage unit is communicated with the corresponding gas barrier unit to be cleaned through the communicating pipeline, so that the inside of the gas insulated transmission line is purged and cleaned, and the problem that the inside dust or metal particles cannot be cleaned in the installation or maintenance process of the gas insulated transmission line is effectively solved.
Further, the gas flowmeter 6, the first pressure gauge 7 and the second pressure gauge 8 are connected with a computer 9 through signal lines. The computer 9 can be used for recording pressure values at different moments in the cleaning process, so that the pressure change in the whole detection process can be conveniently controlled.
Further, a target plate 11 for detecting whether the cleaning is performed or not is arranged at an outlet of the first top hand hole 102 at the top of the first air barrier unit 1, and white soft glue 10 for adsorbing dust is adhered to the target plate 11. Through the white soft rubber 10, dust and impurities generated in the sweeping and cleaning process can be adsorbed, and whether the inside of the cleaning device is cleaned or not is judged.
Further, the second air-separating unit 2 for communicating with the dry air compressor 4 and storing high-pressure air can also be an adjacent air-separating unit or an external air storage tank. The high-pressure gas storage unit can be used for providing high-pressure gas in the purging process.
Further, the communicating pipeline 3 is connected to the orifice flanges of the hand hole, the gas working hole, the gas density relay hole or the explosion-proof film hole on the corresponding first gas isolation unit 1 or the second gas isolation unit 2, and the sealing and fixing connection is ensured; and one end with the larger sum of the cross sectional areas of the holes is used as a purging outlet. Through the various holes, the flexibility of the connection and installation of the system is enhanced. And the larger the sum of the cross-sectional areas of the inlet and outlet holes is, the better the sum is, so as to reduce the airflow resistance and the energy loss. Furthermore, the valve 5 adopts a quick-opening valve so as to reduce energy waste in the valve opening process.
Furthermore, the expansion, contraction or branch position of the internal flow passage of the communication pipeline 3 should be in smooth transition. To reduce local resistance to gas flow and thus reduce energy losses.
Furthermore, when the adjacent air separation units are used as the air source container, the highest air pressure value in the air source container is the rated pressure value or the highest working pressure value designed by the air separation units, and when the air storage tank is used as the air source container, the air source end pressure of the air separation units is not greater than the rated pressure designed by the air separation units; when one or more air separation units are purged at a time, the air separation units are connected through a temporary short pipe. Through the structure, the flexibility of use is enhanced, and the air barrier units can be cleaned.
Furthermore, the source gas should be clean, dry, and oil-free.
Preferably, a gas flowmeter is arranged on the pipeline or an external ultrasonic gas flowmeter is used in the purged gas isolation unit.
Example 2:
the method for cleaning the gas insulated transmission line by adopting the gas purging and cleaning system of the gas insulated transmission line comprises the following steps:
step one, storing high-pressure gas for cleaning:
closing the valve 5, starting the dry air compressor 4, inflating the second air separation unit 2 through the dry air compressor 4, monitoring the pressure P of compressed gas inside the second air separation unit 2 in real time through a first pressure gauge 7 in the inflation process, and closing the dry air compressor 4 when the value of the pressure P of the compressed gas exceeds the designed rated pressure value of the second air separation unit 2, so as to complete the storage of high-pressure gas;
step two, purging and cleaning the first air separation unit 1 to be cleaned by adopting stored high-pressure gas:
after the second air separation unit 2 is completely inflated, the valve 5 is opened, and at the moment, high-pressure gas enters the first air separation unit 1 from the valve 5, and the first air separation unit 1 is subjected to gas purging;
step three, detecting whether the first air separation unit 1 is clean:
when the purging time is not less than t seconds, the target plate 11 covered with the white soft rubber 10 is placed at the position of the second top hand hole 202 of the air outlet of the first air-insulated unit 1, no dust and metal particle impurities exist on the white soft rubber 10, namely, the purging is qualified, and if the purging is not qualified, the purging is continued until the purging is qualified.
In the purging process, reading Q of a gas flowmeter 6 through a computer 9, reading P of a first pressure gauge 7, reading P of a second pressure gauge 8 through a gas-insulated unit, wherein the cross section area of an internal flow passage is S, S is a known quantity 1 The minimum velocity of the air flow in the first air separation unit 1 is calculated:
V i =Q×P÷S÷P 1 （1）
when V is i When the total length of the first air separation unit 1 is greater than or equal to 5.5m/s, the total length of the first air separation unit is s, the shortest time of one or more times of total purging is t, and when the sum of sigma (V) is satisfied i * Δ t) ≧ s, where i =1,2, \ 8230, n, where V i And calculating speed values at different moments for the computer 9, wherein Δ t is the interval between two adjacent moments, so that the time t = n × Δ t, the time t is calculated by the computer 9, and the purging time is not less than t seconds.
Claims (5)
1. The gas purging and cleaning system for the gas insulation power transmission line is characterized by comprising a first gas isolation unit (1) of the gas insulation power transmission line to be purged, wherein a first bottom hand hole (101) of the first gas isolation unit (1) is communicated with a second bottom hand hole (201) of a second gas isolation unit (2) through a communication pipeline (3);
the second top hand hole (202) of the second air isolation unit (2) is communicated with a dry air compressor (4) for supplying air;
a gas flowmeter (6), a first pressure gauge (7) and a valve (5) are sequentially arranged on the communication pipeline (3) between the second bottom hand hole (201) and the first bottom hand hole (101);
a second pressure gauge (8) is communicated with the first air isolating unit (1);
the gas flowmeter (6), the first pressure gauge (7) and the second pressure gauge (8) are connected with a computer (9) through signal lines;
the second air-isolating unit (2) used for communicating the dry air compressor (4) and storing high-pressure air can also select an adjacent air-isolating unit or an externally connected air storage tank;
in the purging process, reading Q of a gas flowmeter (6) through a computer (9), reading P of a first pressure gauge (7), reading P of a second pressure gauge (8), wherein the cross section area of an internal flow passage of the gas isolation unit is S, S is a known quantity, and the cross section area is S 1 And calculating the minimum speed of the air flow in the first air separation unit (1):
V i =Q×P÷S÷P 1 （1）
when V is i When the total length of the first air separation unit (1) is greater than or equal to 5.5m/s, the total length of the first air separation unit (1) is s, the shortest time of single or multiple total purging is t, and when the sum of sigma (V) is met i * Δ t) ≧ s, where i =1,2, \ 8230, n, where V i The speed values at different moments are obtained by calculation of the computer (9), delta t is the interval between two adjacent moments, time t = n x delta t, time t is obtained by calculation of the computer (9), and the purging time is not less than t seconds;
a target plate (11) for detecting whether the cleaning is clean is arranged at the outlet of a first top hand hole (102) at the top of the first air isolation unit (1), and white soft rubber (10) for adsorbing dust is adhered to the target plate (11);
when the adjacent air isolation units are used as the air source container, the highest air pressure value in the air source container is the rated pressure value or the highest working pressure value designed by the air isolation units, and when the air storage tank is used as the air source container, the pressure of the air source end of the air isolation unit is not more than the rated pressure designed by the air isolation unit;
when one or more air separation units are purged at a time, the air separation units are connected through a temporary short pipe.
2. The gas purging and cleaning system for the gas insulated transmission line according to claim 1, wherein the communication pipeline (3) is connected to the orifice flanges of the hand hole, the gas working hole, the gas density relay hole or the explosion-proof film hole of the corresponding first gas isolation unit (1) or the second gas isolation unit (2) and ensures the sealing and fixing connection; and one end with the larger sum of the cross sectional areas of the holes is used as a purging outlet.
3. The gas purging and cleaning system for the gas insulated transmission line according to claim 1, wherein the valve (5) is a quick-opening valve so as to reduce energy waste in the process of opening the valve.
4. The gas purging and cleaning system for the gas insulated transmission line according to claim 1, wherein the communication pipeline (3) has an internal flow passage with a smooth transition at the expansion, contraction or branch position.
5. The method for cleaning the gas insulated transmission line by adopting the gas purging and cleaning system for the gas insulated transmission line according to any one of claims 1 to 4 is characterized by comprising the following steps of:
step one, storing high-pressure gas for cleaning:
closing the valve (5), starting the dry air compressor (4), inflating the second air separation unit (2) through the dry air compressor (4), monitoring the pressure P of compressed gas inside the second air separation unit (2) in real time through a first pressure gauge (7) in the inflation process, and closing the dry air compressor (4) when the value of the pressure P of the compressed gas exceeds the designed rated pressure value of the second air separation unit (2) so as to finish the storage of high-pressure gas;
and step two, purging and cleaning the first air separation unit (1) to be cleaned by adopting stored high-pressure gas:
after the second air separation unit (2) is inflated, opening the valve (5), allowing high-pressure gas to enter the first air separation unit (1) from the valve (5), and performing gas purging on the first air separation unit (1);
step three, detecting whether the first air separation unit (1) is clean:
and when the purging time is not less than t seconds, placing the target plate (11) coated with the white soft rubber (10) at the position of the second top hand hole (202) of the air outlet of the first air-isolating unit (1), wherein the white soft rubber (10) has no dust or metal particle impurities, namely the purging is qualified, and if the purging is not qualified, continuing purging until the purging is qualified.
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| CN202111609929.0A CN114289419B (en) | 2021-12-27 | 2021-12-27 | Gas purging and cleaning system and method for gas insulated transmission line |
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| CN202111609929.0A CN114289419B (en) | 2021-12-27 | 2021-12-27 | Gas purging and cleaning system and method for gas insulated transmission line |
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| CN114289419B true CN114289419B (en) | 2023-02-17 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201375973Y (en) * | 2009-02-20 | 2010-01-06 | 中冶实久建设有限公司南京分公司 | Nitrogen purging device for hydraulic pipeline |
| CN106475368A (en) * | 2015-08-31 | 2017-03-08 | 黄鸣 | Device for blowing pipeline |
| CN108655119A (en) * | 2017-03-27 | 2018-10-16 | 中国二十冶集团有限公司 | Hydraulic plumbing system bidirectional pulse purges precleaning system |
| CN214235413U (en) * | 2021-01-11 | 2021-09-21 | 宣城睿晖宣晟企业管理中心合伙企业(有限合伙) | Tail pipe arranging way |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020130210A1 (en) * | 2018-12-21 | 2020-06-25 | 김병준 | Water pipe cleaning system using high pressure nitrogen and water pipe cleaning method using same |
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2021
- 2021-12-27 CN CN202111609929.0A patent/CN114289419B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201375973Y (en) * | 2009-02-20 | 2010-01-06 | 中冶实久建设有限公司南京分公司 | Nitrogen purging device for hydraulic pipeline |
| CN106475368A (en) * | 2015-08-31 | 2017-03-08 | 黄鸣 | Device for blowing pipeline |
| CN108655119A (en) * | 2017-03-27 | 2018-10-16 | 中国二十冶集团有限公司 | Hydraulic plumbing system bidirectional pulse purges precleaning system |
| CN214235413U (en) * | 2021-01-11 | 2021-09-21 | 宣城睿晖宣晟企业管理中心合伙企业(有限合伙) | Tail pipe arranging way |
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