CN105277480B - A kind of coal gas delivery pipe full-scale test evaluation method - Google Patents
A kind of coal gas delivery pipe full-scale test evaluation method Download PDFInfo
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- CN105277480B CN105277480B CN201510617356.4A CN201510617356A CN105277480B CN 105277480 B CN105277480 B CN 105277480B CN 201510617356 A CN201510617356 A CN 201510617356A CN 105277480 B CN105277480 B CN 105277480B
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Abstract
The invention discloses a kind of coal gas delivery pipe full-scale test evaluation method, coal gas conveying experiment is carried out using X80 and the full-scale welded tube of above Hi-grade steel, the method progress boxing seam welding that full-scale welded tube dock using 2 meters of long pipeline sections according to pipeline construction practice of construction, with pipe end high pressure cover end by the soldering and sealing of steel pipe both ends；The charge/discharge gas red copper airway tube and pressure detecting table that the design of body both ends is connected with hollow type internal thread high pressure connection, and the inlet end of charge/discharge gas red copper airway tube is connected with gas bus-bar, temperature/humidity detector is installed at body both ends, and wireless video monitoring device is installed around；High-purity N is used before inflation2Carry out welding inner air tube displacement, finally successively pour CO in pipe2、H2And N2, the N2Substitute other gas mediums in ature of coal natural gas to be pressurizeed, realize CO under the actual pressure for conveying gas medium and tubing stress state2With H2The infiltration case study of influence and hydrogen of the Coexistence Situation to tubing corrosion.
Description
Technical field：
The invention belongs to oil-gas pipe material engineering test field, is related to the full-scale steel pipe test technology of transportation pipe, especially
It is a kind of Hi-grade steel natural gas from coal delivery pipe full-scale test evaluation method.
Background technology：
Natural gas from coal pipeline pressure typically 12MPa and more than, CO in its gas medium2And H2Content sum
About 3% -5%, wherein H2Content about 2% -3%, hydrogen dividing potential drop up to arrive 0.36MPa.Because hydrogen is a kind of more typical
Korrosionsmedium, in the environment of having free water or condensation water, hydrogen decomposable asymmetric choice net separates out hydrogen atom, and hydrogen atom can be to metal material
Form hydrogen damage.Meanwhile the steel used on Practical Project are all there is defect, such as planar defect (crystal boundary, phase boundary), dislocation,
Triaxiality area etc., the combination of these defects and hydrogen can be strong, can catch hydrogen and stick, become the enrichment region for hydrogen, work as hydrogen atom
It is enriched with metal inside trap to a certain extent, hydrogen will be separated out in steel, promotes steel brittle, regional area occurs
Plastic deformation, crack initiation finally result in cracking.It is that a kind of harmfulness is bigger because hydrogen damage is typically to fail moment
Corrosion Types, contain a certain amount of CO in pumped (conveying) medium in addition2, it is necessary to investigate under carbon dioxide and hydrogen Coexistence Situation to pipe
The influence of line corrosion resisting property.Therefore, natural gas from coal pipe conveying procedure exists in so high hydrogen dividing potential drop and carbon dioxide
The hydrogen infiltration of steel pipe whether can be produced in course of conveying, is work so as to cause the deterioration of tubing and Weld Performance and fracture behaviour
One of Cheng Yingyong most critical issues.
At present, using the spot sample of tubing or weld seam be electrolysed in laboratory and be flushed with hydrogen the experiment side that hydrogen is taken out with vacuum
The change of method, research hydrogen content and tubing and Weld Performance carries out the evaluation of the actual military service process of pipeline, and it can not simulate reality
CO under pipeline pressure and body stress distribution2With H2Influence of the Coexistence Situation to tubing corrosion is with the infiltration situation of hydrogen.Using
Full-scale steel pipe is tested, because pipeline gas pressure is higher (typically in 12MPa and pressure above), test period length, and
In the case of hydrogen medium, specimen potential safety hazard is larger, now has no a kind of efficiency test evaluation method both at home and abroad.In native land
Outside for high pressure gas transmission with Hi-grade steel (X80 and more than) pipeline steel tube in H2Corrosion failure under environment is studied still in blank shape
State, for pipe line steel in H2Corrosion mechanism and form under environment is not clear, and actual engineer applied is even more rare.The present invention
Actual pressure, operating mode and the H that natural gas from coal pipeline is on active service are simulated by a kind of full-scale steel pipe of Hi-grade steel (X80 and more than)2
With CO2The evaluation method that medium content is tested, study under various media, component and different condition to tubing tissue and mechanics
The influence of performance and changing rule, reliable data supporting is provided for actual pipeline engineering construction.
The content of the invention：
A kind of the shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided full chi of Hi-grade steel coal gas delivery pipe
Very little Test model synthetic techniques, overcome the limitation tested using spot sample and carry out the actual military service process evaluation of coal gas conveyance conduit
Property.
The purpose of the present invention solves by the following technical programs：
The present invention coal gas delivery pipe full-scale test evaluation method be：Steel pipe is cut into about 2 meters of pipeline section first,
The method that often section pipeline section docks according to pipeline construction practice of construction carries out boxing seam welding and full-scale welded tube is made, and full-scale
Welded tube both ends symmetric position processes a discharge charge stomata and a pressure sensing port respectively, and by discharge charge stomata and welded tube right-hand member
Hollow type internal thread high pressure connection connection, pressure sensing port is connected with the hollow type internal thread high pressure connection of welded tube left end, together
When by the pipe end high pressure cover end soldering and sealing of full-scale welded tube both ends, gas pressure is installed in the hollow type internal thread high pressure connection of left end
Power table, the hollow type internal thread high pressure connection of right-hand member are connected with one end of charge/discharge gas air guide copper tube, charge/discharge gas air guide red copper
The other end of pipe is connected with the charging valve joint of gas bus-bar, and in full-scale welded tube both ends installing pipe body temperature/hygrometer,
Surrounding install wireless video monitor, temperature/hygrometer just facing to wireless video monitor；Finally use remote multiple step format
It is inflated, first by gas bus-bar to being filled with high-purity N in steel pipe before experiment2The air in steel pipe is replaced, then successively
By gas bus-bar to the CO being filled with steel pipe with being equal to content in ature of coal gas medium component2And H2, finally by confluxing
Arrange to being filled with high-purity N in steel pipe2Supercharging, until overpressure reach ature of coal natural gas line design or actual motion pressure, fill
Gas gauge, tube head temperature/hygrometer and pipe when dwell period and pressure release are carried out after the completion of pressure, and recording pressurising, pressurize, pressure release
The data of tail temperature/hygrometer, hydrogen content finally is carried out to body mother metal, weld seam and physicochemical property detects.
Above-mentioned full-scale welded tube is X80 and above Hi-grade steel straight-line joint submerged arc welding tube (being welded as longitudinal seam welding) or spiral welding
Seam welded tube.
The pipe range of above-mentioned full-scale welded tube is 4 meters to 6 meters.
Length >=20 meter of above-mentioned charge/discharge gas air guide copper tube.
It is described above to be filled with high-purity N2When replacing the air in steel pipe, 0.5MPa high pure nitrogen is first filled with, stands 2 minutes
After detect each pipeline, joint, pressure gauge installation place etc. and have No leakage, when check determine gas circuit No leakage after continue to testing steel pipe
2MPa is forced into, stands 10 minutes, then is released nitrogen in pipe and air by bus-bar.2 to 3 times repeatedly, until using micro-
Oxygen content terminates less than 1.5% rear substitution in amount oxygen analyzer signal piping system.
It is described above to be filled with high-purity N2Supercharging is to use high-purity N2Gas replaces other gas component simulations in ature of coal natural gas
Actual pipeline military service pressure, it is pressurised into 5MPa, 8MPa, 10MPa until reaching ature of coal natural gas line to overpressure successively
Design or actual motion pressure.
The present invention has the advantage that and effect：
1st, the method that the present invention carries out coal gas conveying test evaluation using full-scale welded tube, realizes conveying gas medium
Actual pressure and tubing stress state under CO2With H2Influence of the Coexistence Situation to tubing corrosion, can with the infiltration case study of hydrogen
Make up laboratory use tubing spot sample experimental study method carry out coal gas delivery pipe test evaluation it is insufficient with it is scarce
Point.
2nd, the method that the full-scale welded tube that the present invention uses is docked by about 2 meters of long pipeline sections according to pipeline construction practice of construction is entered
Row girth joint is welded, and realizes basically identical with actual conditions.
3rd, the present invention replaces (N by rigorous remote multiple step format2Displaced air), inflation (CO2/H2), pressurization (N2)、
The methods of pressurize, deflation, monitoring and Stress control, and use high-purity N2Increased instead of other gas groups in ature of coal natural gas
Pressure, is finally reached CO2And H2It is equal to content with ature of coal gas medium component and tests the requirement of security.
Brief description of the drawings：
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail.
Fig. 1 is coal gas delivery pipe full-scale test system structure diagram.
Fig. 2 is full-scale welded tube structural representation.
Fig. 3 is gas bus structures schematic diagram.
Brief description of the drawings：1st, full-scale welded tube；2nd, gas gauge；3rd, charge/discharge gas air guide copper tube；4th, gas bus-bar；
5th, tube head temperature/hygrometer；6th, pipe tail temperature/hygrometer；7th, No. I wireless video monitor；8th, irony test safety net；9th, No. II nothing
Line video-frequency monitor；10th, sunk type test pit；11st, gas conductor rail support；1-1, the 1. long pipeline sections of number 2000mm；1-2,2. number
The long pipeline sections of 2000mm；1-3, the 3. long pipeline sections of number 2000mm；1-4,1. number pot type pipe end high pressure cover end；1-5,2. number pot type pipe end is high
Press seal head；1-6, No. I high pressure cover end girth joint；1-7,1. number pipeline section butt girth welding seam；1-8,2. number pipeline section butt girth welding seam；1-
9th, No. II high pressure cover end girth joint；1-10, tube head hollow type internal thread high pressure connection；1-11, pipe tail hollow type internal thread high pressure
Joint；4-1, gas bus-bar pipeline；4-2, bus-bar pipeline end cap；4-3,1. number charging valve；4-4,2. number inflation
Valve；4-5,3. number charging valve；4-6,4. number charging valve；4-7,5. number charging valve；4-8,6. number charging valve；4-9、
No. I ball valve；4-10, air gauge；4-11, tee connector；4-12, No. II ball valve；4-13, No. III ball valve；4-14,1. number red copper
Pipe gas-charging connection；4-15,2. number copper tube gas-charging connection；4-15,3. number copper tube gas-charging connection；4-17,4. a number copper tube fills
Gas joint；4-18,5. number copper tube gas-charging connection.
Embodiment：
Embodiment 1：
As shown in Figure 1 to Figure 3, a kind of coal gas delivery pipe full-scale test evaluation method, it includes 1, full-scale welded tube；
2nd, gas gauge；3rd, air guide copper tube；4th, gas bus-bar；5th, tube head temperature/hygrometer；6th, pipe tail temperature/hygrometer；7th, No. I
Wireless video monitor；8th, irony test safety net；9th, No. II wireless video monitor；10th, sunk type test pit；11st, discharge charge
Gas conductor rail support.
The full-scale welded tube 1 is positioned in sunk type test pit 10；No. I wireless video monitor 7 and No. II wirelessly regard
Frequency monitor 9 installs the upper left side of sunk type test pit 10 and right position respectively using expansion bolt；Gas gauge 2 passes through spiral shell
Line is with the hollow type internal thread high pressure connection 1-10 of the full-scale left end of welded tube 1 (i.e. tube head) with being connected；The one end of air guide copper tube 3 leads to
The hollow type internal thread high pressure connection 1-11 that screw thread is crossed with the full-scale right-hand member of welded tube 1 (i.e. pipe tail) is connected, and the other end passes through screw thread
It is connected with the 1. number charging valve joint 4-3 on gas bus-bar 4；Gas bus-bar 4 is fixed on gas by U-shaped fixing bolt
On conductor rail support 11；Gas conductor rail support 11 is fixed on ground using expansion bolt；Tube head temperature/hygrometer 5 and pipe tail
Temperature/hygrometer 6 is respectively adopted plastic adhesive tape and is fixed on the tube head pipe tail symmetric position of full-scale welded tube 1, and makes temperature/hygrometer 5
No. I wireless video monitor 7 and No. II wireless video monitor 9 are respectively facing with the positive face of pipe tail temperature/hygrometer 6；Irony
Test safety net 8 is fixed on the upper end of sunk type test pit 10 using expansion bolt.
As shown in Fig. 2 full-scale welded tube 1 is by the long pipeline section 1-1 of 1. number 2000mm, 2. long pipeline section 1-2 of number 2000mm, 3. number
The long pipeline section 1-3 of 2000mm according to the method that pipeline construction practice of construction is docked by 1. number pipeline section butt girth welding seam 1-7 with 2. number
Pipeline section butt girth welding seam 1-8 is welded, and passes through No. I high pressure seal ring weld seam in the long pipeline section 1-1 of the 1. number 2000mm other end
1-6 welds with 1. number pot type pipe end high pressure cover end, passes through No. II high pressure cover end ring in the long pipeline section 1-3 of the 3. number 2000mm other end
Weld seam 1-9 welds with 2. number pot type pipe end high pressure cover end.Meanwhile process one in the two ends symmetric position of full-scale welded tube 1
Discharge charge stomata and a pressure sensing port, and the full-scale tube head of welded tube 1 processing pressure sensing port on using welding manner with
Hollow type internal thread high pressure connection 1-10 connections, the full-scale pipe tail of welded tube 1 processing discharge charge stomata on using welding manner with
Hollow type internal thread high pressure connection 1-11 connections.
If Fig. 3 is to shown, gas bus-bar 4 includes gas bus-bar pipeline 4-1, bus-bar pipeline end cap 4-2,1.
Number charging valve 4-3,2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-
7th, 6. number charging valve 4-8, No. I ball valve 4-9, air gauge 4-10, tee connector 4-11, No. II ball valve 4-12, No. III ball valve
4-13,1. number copper tube gas-charging connection 4-14,2. number copper tube gas-charging connection 4-15,3. number copper tube gas-charging connection 4-16,4.
Number copper tube gas-charging connection 4-17,5. number copper tube gas-charging connection 4-18.
Wherein, will 1. number charging valve 4-3,2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-
6th, 5. number charging valve 4-7,6. number charging valve 4-8 lower end air inlet hickey and No. I ball valve 4-9, air gauge 4-10, three
Lead to joint 4-11 and pass sequentially through screw thread and be connected with gas bus-bar pipeline 4-1, bus-bar pipeline end cap 4-2 passes through screw thread
Gas bus-bar pipeline 4-1 high order end is installed on, No. II ball valve 4-12 is installed on the upper of tee connector 4-11 by screw thread
End, No. III ball valve 4-13 are installed on tee connector 4-11 right-hand member by screw thread, and air guide copper tube 3 is by screw thread with 1. number filling
Air valve 4-3 side inflation hickey connects, 1. number copper tube gas-charging connection 4-14,2. number copper tube gas-charging connection 4-
15th, 3. number copper tube gas-charging connection 4-16,4. number copper tube gas-charging connection 4-17,5. number copper tube gas-charging connection 4-18 one end
By screw thread successively with 2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-
7th, 6. number charging valve 4-8 side inflation hickey connection.
When being replaced using high pure nitrogen and to being filled with carbon dioxide, hydrogen in full-scale welded tube 1, and increased using high pure nitrogen
During pressure, will 1. number copper tube gas-charging connection 4-14,2. number copper tube gas-charging connection 4-15,3. number copper tube gas-charging connection 4-16,
4. number copper tube gas-charging connection 4-17,5. number copper tube gas-charging connection 4-18 other end is connected with gas cylinder by ventilating joint,
Closing No. II ball valve 4-12 and No. III ball valve 4-13,2. opening gas cylinder valve, 1. number charging valve 4-3, number charging valve 4-4,
3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve 4-8 and No. I ball valve 4-9 enter
Row inflation, and the pressure for being filled with not androgynous gas and different phase is checked by air gauge 4-10, control the flow velocity of gas.Meanwhile
By No. I wireless video monitor 7 and No. II remote monitoring of wireless video monitor 9, and record the gas on full-scale welded tube 1
The data of pressure gauge 2, tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6.
When entering pressurize experimental stage after inflation terminates, 1. number charging valve 4-3,2. number charging valve 4-4,3. are closed
Number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve 4-8, No. I ball valve 4-9, No. II
Ball valve 4-12 and No. III ball valve 4-13, and disconnect 1. number copper tube gas-charging connection 4-14,2. number copper tube gas-charging connection 4-15,3.
Number copper tube gas-charging connection 4-16,4. number copper tube gas-charging connection 4-17, the 5. company of number copper tube gas-charging connection 4-18 and gas cylinder
Connect, by No. I wireless video monitor 7 and No. II remote monitoring of wireless video monitor 9, and record on full-scale welded tube 1
The data of gas gauge 2, tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6.
When entering the pressure release stage after testing pressurize and terminating, 1. number charging valve 4-3, No. I ball valve 4-9, No. II ball are opened
Valve 4-12 and No. III ball valve 4-13 are deflated, long-range by No. I wireless video monitor 7 and No. II wireless video monitor 9
Monitoring, and record the data of the gas gauge 2 on full-scale welded tube 1, tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6.
Embodiment 2：
It is complete that coal gas delivery pipe is carried out using a kind of coal gas delivery pipe full-scale test evaluation method described in embodiment 1
Dimension test.
Grown using 1219 × 18.4 × 6000mm of X80 Φ spirally welded steel pipe according to 1. number 2000mm is cut into shown in Fig. 2
The long pipeline section 1-2 of pipeline section 1-1,2. number 2000mm, the 3. long pipeline section 1-3 of number 2000mm, and according to the docking of pipeline construction practice of construction
Method completes the girth joint butt welding of pipeline section by 1. number pipeline section butt girth welding seam 1-7 with 2. number pipeline section butt girth welding seam 1-8,
1. the long pipeline section 1-1 of number 2000mm other end passes through No. I high pressure cover end girth joint 1-6 and experiment tube wall thickness, material matching
1. number pot type pipe end high pressure cover end welding, passes through No. II high pressure cover end girth joint in the long pipeline section 1-3 of the 3. number 2000mm other end
1-9 and experiment tube wall thickness, material matching 2. number pot type pipe end high pressure cover end weld.Meanwhile X80 Φ 1219 × 18.4 ×
The two ends symmetric position of the full-scale welded tubes 1 of 6000mm processes a discharge charge stomata and a pressure sensing port, and full-scale
It is connected on the pressure sensing port of the tube head of welded tube 1 processing using welding manner with hollow type internal thread high pressure connection 1-10, in pipe tail
It is connected on the discharge charge stomata of processing using welding manner with hollow type internal thread high pressure connection 1-11.
According to described in embodiment 1, the full-scale welded tubes 1 of 1219 × 18.4 × 6000mm of X80 Φ are positioned over sunk type experiment
In hole 10；No. I wireless video monitor 7 and II is installed using expansion bolt in the left and right top position of sunk type test pit 10
Number wireless video monitor 9；Gas gauge 2 is connected by screw thread with hollow type internal thread high pressure connection 1-10；Air guide is purple
(2500mm) one end of copper pipe 3 is connected by screw thread with hollow type internal thread high pressure connection 1-11, and the other end passes through screw thread and gas
1. number charging valve joint 4-3 side inflation hickey connection, gas bus-bar 4 pass through U-shaped fixing bolt on bus-bar 4
It is fixed on ground on 20 meters remote of gas conductor rail support 11.Meanwhile in the full-scale welderings of 1219 × 18.4 × 6000mm of X80 Φ
The tube head of pipe 1 fixes tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6, its mistake with pipe tail symmetric position using plastic adhesive tape
The positive face of temperature/hygrometer 5 and pipe tail temperature/hygrometer 6 need to be respectively facing No. I wireless video monitor 7 by journey and No. II wireless
Video-frequency monitor 9, and irony test safety net 8 is installed using expansion bolt in the upper end of sunk type test pit 10.
High-purity N2Gas enters line replacement：By high-purity N2Gas cylinder and the 1. number copper tube gas-charging connection 4- on gas bus-bar 4
14th, 2. number copper tube gas-charging connection 4-15,3. number copper tube gas-charging connection 4-16,4. number copper tube gas-charging connection 4-17,5. number
The 4-18 connections of copper tube gas-charging connection, No. II ball valve 4-12 and No. III ball valve 4-13 is closed, open 1. number charging valve 4-3,2.
Number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve 4-8
And No. I ball valve 4-9 is inflated with gas cylinder valve, makes gas sound steady without howling, filled by air gauge 4-10 observations
Enter high-purity N2The pressure of gas, and control gas flow rate to be not more than 20Nm3/h.Meanwhile pass through No. I wireless video monitor 7 and II
Number remote monitoring of wireless video monitor 9, records gas gauge 2, tube head temperature/hygrometer 5 and the pipe tail on full-scale welded tube 1
The data of temperature/hygrometer 6.When the pressure on gas gauge 2 and air gauge 4-10 reaches 0.5MPa, close and converged with gas
All high-purity Ns of the connection of stream row 42Gas cylinder valve, the joint, valve, pressure of whole gas circuit are smeared after standing 2 minutes using suds
There is No leakage power table installation place etc..All high-purity Ns being connected with gas bus-bar 4 are opened after determination gas circuit No leakage to be checked2
The pressure that gas cylinder valve continues to be forced into gas gauge 2 reaches 2MPa, controls this process to be no less than 40 minutes, stands 5 minutes,
Turn off all high-purity Ns being connected with gas bus-bar 42Gas cylinder valve, open No. II ball valve 4-12 and No. III ball valve 4-13 and put
The nitrogen and air gone out in full-scale welded tube 1, and using oxygen content in trace oxygen analyzer signal piping system, until gas pressure
Power table 2 and air gauge 4-10 pressure reach 0.2MPa, turn off No. II ball valve 4-12 and No. III ball valve 4-13.Inflation is put repeatedly
Gas 2-3 times, until oxygen content terminates less than 1.5% rear substitution in trace oxygen analyzer signal piping system, now pipe-line system
Middle high-purity N2The pressure of gas is accurate to 0.2MPa.
It is filled with CO2Gas：Full-scale welded tube 1 replace it is qualified after, close high-purity N2Gas cylinder valve, high-purity N is disconnected successively2Gas
Connection and and CO of the bottle with 1. number copper tube gas-charging connection 4-142Gas cylinder connection, disconnect high-purity N2Gas cylinder is inflated with 2. number copper tube
Joint 4-15 connection and and CO2Gas cylinder connection, disconnect high-purity N2Gas cylinder and 3. number copper tube gas-charging connection 4-16 connection and and
CO2Gas cylinder connection, disconnect high-purity N2Connection and and CO of the gas cylinder with 4. number copper tube gas-charging connection 4-172Gas cylinder connection, disconnect height
Pure N2Connection and and CO of the gas cylinder with 5. number copper tube gas-charging connection 4-182Gas cylinder connects, and opens CO2Gas cylinder valve carries out CO2Fill
Gas, and CO is filled with by air gauge 4-10 and the observation of gas gauge 22The pressure of gas, until pressure gauge reaches
0.34MPa, this process is controlled to be filled with CO2Time is not less than 20 minutes, stands 5 minutes, it is ensured that pressure is no more than 0.34MPa.Together
When, whole process records full-scale weldering by No. I wireless video monitor 7 and No. II remote monitoring of wireless video monitor 9
The data of gas gauge 2, tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6 on pipe 1.
It is filled with H2Gas：Fill CO2After gas terminates, CO is closed2Valve on gas cylinder and 1. number charging valve 4-3, break successively
Open CO2Connection and and H of the gas cylinder with 1. number copper tube gas-charging connection 4-142Gas cylinder connection, disconnect CO2Gas cylinder and 2. number copper tube
Gas-charging connection 4-15 connection and and H2Gas cylinder connection, disconnect CO2Gas cylinder and 3. number copper tube gas-charging connection 4-16 connection and and
H2Gas cylinder connection, disconnect CO2Connection and and H of the gas cylinder with 4. number copper tube gas-charging connection 4-172Gas cylinder connection, disconnect CO2Gas cylinder
Connection and and H with 5. number copper tube gas-charging connection 4-182Gas cylinder connects, and opens H2Gas cylinder valve and 1. a number charging valve 4-3 enters
Row H2Inflation, and H is filled with by air gauge 4-10 and the observation of gas gauge 22The pressure of gas, until pressure gauge reaches
0.7MPa, this process is controlled to be filled with H2Time is not less than 20 minutes, stands 5 minutes, it is ensured that pressure is no more than 0.7MPa.Meanwhile
Whole process records full-scale welded tube 1 by No. I wireless video monitor 7 and No. II remote monitoring of wireless video monitor 9
On gas gauge 2, the data of tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6.
Using high-purity N2Gas is pressurizeed：Fill H2After gas terminates, H is closed2Valve on gas cylinder and 1. number charging valve
4-3, H is disconnected successively2Connection and and high-purity N of the gas cylinder with 1. number copper tube gas-charging connection 4-142Gas cylinder connection, disconnect H2Gas cylinder
Connection and and high-purity N with 2. number copper tube gas-charging connection 4-152Gas cylinder connection, disconnect H2Gas cylinder connects with a 3. number copper tube inflation
Head 4-16 connection and and high-purity N2Gas cylinder connection, disconnect H2Connection and and height of the gas cylinder with 4. number copper tube gas-charging connection 4-17
Pure N2Gas cylinder connection, disconnect H2Connection and and high-purity N of the gas cylinder with 5. number copper tube gas-charging connection 4-182Gas cylinder connects, and opens high
Pure N2Gas cylinder valve and 1. number charging valve 4-3 progress high-purity Ns2Inflation, and it is wireless by No. I wireless video monitor 7 and No. II
The remote monitoring of video-frequency monitor 9, record gas gauge 2, tube head temperature/hygrometer 5 and pipe tail temperature on full-scale welded tube 1/wet
The data of degree meter 6.When the pressure gauge of gas gauge 2 reaches 5MPa, 2. number charging valve 4-4,3. number charging valve 4- are closed
5th, 4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve 4-8, control this process to be filled with high-purity N2Time
Not less than 80 minutes；Stand 15 minutes and treat tube head temperature/hygrometer 5 and pipe tail temperature/data stabilization of hygrometer 6, the He of gas gauge 2
Air gauge 4-10 also reach open after 5MPa 2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,
5. number charging valve 4-7,6. a number charging valve 4-8 continues to be filled with high-purity N2, when the pressure gauge of gas gauge 2 reaches 8MPa,
Close 2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number inflation
Valve 4-8, this process is controlled to be filled with high-purity N2Time be not less than 60 minutes；Stand 30 minutes and treat tube head temperature/hygrometer 5 and pipe
Tail temperature/the data stabilization of hygrometer 6, gas gauge 2 and air gauge 4-10 open 2. number charging valve 4- after also reaching 8MPa
4th, 3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. a number charging valve 4-8 continue to be filled with it is high-purity
N2, when the pressure gauge of gas gauge 2 reaches 10MPa, close 2. number charging valve 4-4,3. number charging valve 4-5,4. number fill
Air valve 4-6,5. number charging valve 4-7,6. number charging valve 4-8, control this process to be filled with high-purity N2Time be not less than 90
Minute, and stand 40 minutes and treat tube head temperature/hygrometer 5 and the pipe tail temperature/data stabilization of hygrometer 6, gas gauge 2 and air gauge
4-10 also reach open after 10MPa 2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number fill
Air valve 4-7,6. a number charging valve 4-8 continues to be filled with high-purity N2, when the pressure gauge of gas gauge 2 reaches 12MPa, close 2.
Number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve 4-
8, control this process to be filled with high-purity N2Time be not less than 120 minutes, and stand and treat tube head temperature/hygrometer 5 and pipe tail in 50 minutes
The data stabilization of temperature/hygrometer 6, gas gauge 2 and air gauge 4-10 also reach close after 12MPa 1. number charging valve 4-3,
2. number charging valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve
4-8, No. I ball valve 4-9 and high-purity N2Gas valve, disconnect 1. number copper tube gas-charging connection 4-14,2. number copper tube gas-charging connection
4-15,3. number copper tube gas-charging connection 4-16,4. number copper tube gas-charging connection 4-17,5. number copper tube gas-charging connection 4-18 and height
Pure N2The connection of gas cylinder, by No. I wireless video monitor 7 and No. II remote monitoring of wireless video monitor 9, and record full chi
The data of gas gauge 2, tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6 on very little welded tube 1.
The pressure of above gas replenishment process such as storage pressure and inflation system quite can not continue boost charge-air, need to more take a breath
During bottle, 1. number charging valve 4-3 is first closed, disconnects gas cylinder and 1. number copper tube gas-charging connection 4-14 successively further according to actual conditions
And it is connected immediately with newly more renewing gas cylinder, disconnects gas cylinder with 2. number copper tube gas-charging connection 4-15 and immediately with newly more renewing gas cylinder
Connection, gas cylinder is disconnected with 3. number copper tube gas-charging connection 4-16 and is connected immediately with newly more renewing gas cylinder, disconnects gas cylinder and 4. number
Copper tube gas-charging connection 4-17 simultaneously new renew immediately and more gas cylinder connection, disconnects gas cylinder with 5. number copper tube gas-charging connection 4-18 simultaneously
It is connected immediately with newly more renewing gas cylinder, then opens 1. number charging valve a 4-3 and Xin Geng and renew gas cylinder valve continuation plenum, with
Ensure that inflating whole process pressure stability rises, and avoid air from entering.
Above gas replenishment process is after time of repose, when tube head temperature/hygrometer 5 and pipe tail temperature/6 data stabilization of hygrometer, when
When appearance gas gauge 2 and air gauge 4-10 pressure data are inconsistent, quiescent time need to be extended, until gas gauge 2
It is consistent with air gauge 4-10 pressure data；It is consistent with gas pressure table 4-10 pressure data and not when there is gas gauge 2
When reaching preset inflation value, need to reopen all gas cylinder valves being connected with gas bus-bar 4 continue to be inflated to it is default
Pressure, turn off all gas cylinder valves being connected with gas bus-bar 4 and stand certain time again, until tube head temperature/hygrometer 5
And pipe tail temperature/data stabilization of hygrometer 6 and pressure gauge 2 it is consistent with air gauge 4-10 pressure data and reach preset inflation
Next stage inflation is carried out during value as described above.
Pressurize is tested：Aeration phase terminates after above the blowing pressure reaches default 12MPa and stabilization, into pressurize rank
Section.Now, 90 days remote monitorings, and every 2 hours are carried out by No. I wireless video monitor 7 and No. II wireless video monitor 9
Record the data of gas gauge 2 on full-scale welded tube 1, tube head temperature/hygrometer 5 and pipe tail temperature/hygrometer 6.
Above packing stage is such as because hypertonia occurs in temperature Change and when determining to need deflation pressure release, opens 1. number inflation
Valve 4-3, No. I ball valve 4-9, No. II ball valve 4-12 and No. III ball valve 4-13 carry out deflation pressure release, until reaching default maximal pressure
1. number charging valve 4-3, No. I ball valve 4-9, No. II ball valve 4-12 and No. III ball valve 4-13 are turned off during power and continues pressure maintaining period；
Such as because temperature Change occur hypotony and need pressurize inflation when, be first turned on 1. number charging valve 4-3, No. I ball valve 4-9,
No. II ball valve 4-12, No. III ball valve 4-13 deflate 1 minute, turn off 1. number charging valve 4-3, No. II ball valve 4-12, No. III ball
Valve 4-13, and open 2. number charging valve 4-4 successively and 1. a number copper tube gas-charging connection 4-14 will be connected with gas cylinder, and open and 3. number fill
2. air valve 4-5 a number copper tube gas-charging connection 4-15 will be connected with gas cylinder, and be opened 4. number charging valve 4-6 and 3. will fill a number copper tube
Gas joint 4-16 connects with gas cylinder, open 5. number charging valve 4-7 will 4. number copper tube gas-charging connection 4-17 and connected with gas cylinder,
5. open 6. number charging valve 4-8 a number copper tube gas-charging connection 4-18 will connect with gas cylinder, finally unlatching gas cylinder valve and 1. number
Charging valve 4-3 is inflated, until closed when reaching default maximum pressure gas cylinder valve, 1. number charging valve 4-3,2. number fill
Air valve 4-4,3. number charging valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. number charging valve 4-8, No. I
Ball valve 4-9 continues pressure maintaining period.
Deflation pressure release：After completing the experiment of pressurize in 90 days, 1. number charging valve 4-3, No. I ball valve 4-9, No. II ball valve 4- are opened
12 and No. III ball valve 4-13 carries out deflation pressure release, slowly to depressurize during pressure release, pressure release speed is not higher than 20Nm3/h.When pipeline system
When gas gauge 2 and gas press table 4-10 pressure pressure release to 2MPa in system, then open 2. number charging valve 4-4,3. number inflation
Valve 4-5,4. number charging valve 4-6,5. number charging valve 4-7,6. a number charging valve 4-8 continues deflation pressure release；Work as pipe
When gas gauge 2 and gas press table 4-10 pressure values to 0 in the system of road, No. II ball valve 4-12 and No. III ball valve 4-13 is closed,
And use high-purity N2Gas cylinder with 1. number copper tube gas-charging connection 4-14,2. number copper tube gas-charging connection 4-15,3. a number copper tube fills
Gas joint 4-16,4. number copper tube gas-charging connection 4-17,5. number copper tube gas-charging connection 4-18 connections, and open gas cylinder valve and enter
Row high-purity N2Inflating pressure, when gas gauge 2 and gas pressure table 4-10 reach 0.6MPa, then open No. II ball valve 4-12 and
No. III ball valve 4-13 deflates, and uses H in hydrogen analyser signal piping system2The content of gas, repeat above inflating pressure and
Deflation pressure release 2-3 times, until H in hydrogen analyser signal piping system2The content of gas reaches 19%, gas pressure in pipe-line system
When power table 2 and gas press table 4-10 pressure values to 0, closing gas cylinder valve, disconnection gas cylinder and 1. number copper tube gas-charging connection 4-14,
2. number copper tube gas-charging connection 4-15,3. number copper tube gas-charging connection 4-16,4. number copper tube gas-charging connection 4-17,5. number red copper
Pipe gas-charging connection 4-1 8 connection, and dismantle irony protection network 8, air guide copper tube 3, gas gauge 2, tube head temperature/hygrometer
5th, pipe tail temperature/hygrometer 6 etc., the full-scale welded tubes 1 of 1219 × 18.4 × 6000mm of X80 Φ is hung out into sunk type test pit 10 and carried out
The detection of physicochemical property and H.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The embodiment of the present invention is only limitted to this, for general technical staff of the technical field of the invention, is not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (7)
- A kind of 1. coal gas delivery pipe full-scale test evaluation method, it is characterised in that：The full-scale examination of coal gas delivery pipe Testing evaluation method is：Steel pipe is cut into 2 meters of pipeline section first, often saves the method that pipeline section docks according to pipeline construction practice of construction Carry out boxing seam welding and be made full-scale welded tube (1), and full-scale welded tube (1) both ends symmetric position process respectively one fill/ Air vent and a pressure sensing port, discharge charge stomata is passed through into welding manner and pipe tail hollow type internal thread high pressure connection (1- 11) connecting, pressure sensing port is connected by welding manner with tube head hollow type internal thread high pressure connection (1-10), while by full chi Very little welded tube (1) both ends pipe end high pressure cover end soldering and sealing；Gas pressure is installed in tube head hollow type internal thread high pressure connection (1-10) Power table (2), pipe tail hollow type internal thread high pressure connection (1-11) are connected with one end of charge/discharge gas air guide copper tube (3), discharge charge The other end of conductance gas copper tube (3) is connected with the charging valve joint (4-3) of gas bus-bar (4), and in full-scale welded tube (1) both ends symmetric position installs tube head temperature/hygrometer (5) and pipe tail temperature/hygrometer (6) respectively, and surrounding installs No. I wireless video Monitor (7) and No. II wireless video monitoring device (9), tube head temperature/hygrometer (5) just facing to No. I wireless video surveillance Device (7), pipe tail temperature/hygrometer (6) just facing to No. II wireless video monitor (9)；Secondly filled using remote multiple step format Gas, by gas bus-bar (4) to being filled with high-purity N in steel pipe before experiment2The air in steel pipe is replaced, then successively passes through gas Bus-bar (4) is to the CO being filled with steel pipe with content is equal in ature of coal gas medium component2And H2, conflux finally by gas Row (4) in steel pipe to being filled with high-purity N2Supercharging, until overpressure reach ature of coal natural gas line design or actual motion pressure, Gas gauge (2), tube head temperature/wet when treating to carry out dwell period and pressure release after the completion of pressurising, and recording pressurising, pressurize and pressure release The data of degree meter (5) and pipe tail temperature/hygrometer (6), hydrogen content finally is carried out to body mother metal, weld seam and physicochemical property detects.
- 2. coal gas delivery pipe full-scale test evaluation method as claimed in claim 1, it is characterised in that：The full-scale welded tube (1) it is X80 and above Hi-grade steel straight-line joint submerged arc welding tube or spiral weld welded tube, and straight-line joint submerged arc welding tube is welded as longitudinal joint weldering Connect.
- 3. coal gas delivery pipe full-scale test evaluation method as claimed in claim 1, it is characterised in that：The full-scale welded tube (1) pipe range is 4 meters to 6 meters.
- 4. coal gas delivery pipe full-scale test evaluation method as claimed in claim 1, it is characterised in that：The discharge charge conductance Length >=20 meter of gas copper tube (3).
- 5. coal gas delivery pipe full-scale test evaluation method as claimed in claim 1, it is characterised in that：The multiple step format inflation When control gas flow rate≤20Nm3/h。
- 6. coal gas delivery pipe full-scale test evaluation method as claimed in claim 1, it is characterised in that：It is described to be filled with high-purity N2 Oxygen content in trace oxygen analyzer signal piping system is used when replacing the air in steel pipe, when oxygen content is rearmounted less than 1.5% Change end.
- 7. coal gas delivery pipe full-scale test evaluation method as claimed in claim 1, it is characterised in that：It is described to be filled with high-purity N2 Intraductal atmospheric pressure is set to increase to 5MPa, 8MPa, 10MPa, 12MPa successively during supercharging.
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| CN109469833B (en) * | 2018-10-15 | 2021-03-30 | 中石化石油工程设计有限公司 | Determination test method for content of hydrogen permeating in coal gas pipeline |
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Effective date of registration: 20181015 Address after: 100007 Dongzhimen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China Petroleum and Natural Gas Group Co., Ltd. Address before: 721008 10 Jiang Tan Road, Weibin District, Baoji, Shaanxi. Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |