CN101509605A - Method for recovering relief gas in process for examining and repairing gas pipe network - Google Patents
Method for recovering relief gas in process for examining and repairing gas pipe network Download PDFInfo
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- CN101509605A CN101509605A CNA2009100376979A CN200910037697A CN101509605A CN 101509605 A CN101509605 A CN 101509605A CN A2009100376979 A CNA2009100376979 A CN A2009100376979A CN 200910037697 A CN200910037697 A CN 200910037697A CN 101509605 A CN101509605 A CN 101509605A
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Abstract
The invention discloses a recovery device for leaked gas in the maintaining operation process of gas pipe network, comprising a pressure device provided with a gas inlet and a gas outlet, a gas inlet pipeline, a gas outlet pipeline, a maintaining side pipeline, an operation side pipeline, an inert gas bomb and an air inlet; wherein the maintaining side pipeline and gas inlet pipeline are connected by a control valve (81); the operation side pipeline and gas outlet pipeline are connected by a control valve (82); the other sides of the maintaining side pipeline and operation side pipeline are respectively connected with a hose tube; the maintaining side pipeline and gas outlet pipeline are connected by a control valve (83); the operation side pipeline and gas inlet pipeline are connected by a control valve (84); the inert gas bomb is connected with the maintaining side pipeline by a control valve; and the air inlet is connected with the gas inlet pipeline by a control valve. The recovery device recycles and uses the gas wasted in traditional operation manner, polluting atmospheric environment and having potential safety hazard, substantially implements zero emission and avoids safety accident.
Description
Technical field
The present invention relates to pipeline network of fuel gas in city maintenance, construction and operation management technical field.
Background technique
Pipeline network of fuel gas in city runs to certain time limit, and pipeline is aging or owing to other various reasons etc., unavoidably need keep in repair or operations such as accident is speedily carried out rescue work, repairing it.Possess medium-scale above pipeline network of fuel gas in city for one, the total length of pipe network pipeline is generally all more than thousand kilometers, even kilometer up to ten thousand.Such as cities such as Beijing, Shanghai, Tianjin, Guangzhou.In 1 year, all kinds of inspections (robbing) are repaiied hundreds of.Following table 1 is the basic condition summary sheet that compression ignite tracheae net was speedily carried out rescue work in recent years and rushed to repair in the Guangzhou.
Table 1: the compression ignite tracheae net repairing situation summary sheet (unit: number of times) that speedily carries out rescue work in the Guangzhou
| Project | 2004 | 2005 | 2006 | 2007 | 2008 | Add up to |
| Speedily carry out rescue work | 80 | 74 | 46 | 50 | 35 | 285 |
| Repairing | 98 | 106 | 120 | 82 | 98 | 504 |
Historical data from table, number of times is on a declining curve though the Guangzhou gas ductwork is speedily carried out rescue work over the years, and repairing number of times substantially constant maintains about 100 times/year.Data show that the repairing of speedily carrying out rescue work is not a peanut, and also that's about the size of it in domestic other city.
Below be the upkeep operation mode of existing gas ductwork:
At present, the middle compression ignite feed channel of domestic city, no matter be the scheduled overhaul operation, still the accident repairing operation of speedily carrying out rescue work, owing to the combustion gas that has certain pressure in the pipeline inevitably, examine (robbing) and repair operation, all are the modes that adopt " directly diffusing earlier combustion gas in the pipe of maintenance position;, and then carry out construction operation " without exception with reduction pressure.That is, in advance gaseous-pressure in the pipeline is reduced to certain requirement,, and then carries out repair with the primary condition of satisfied maintenance.
Concrete steps: before the upkeep operation, earlier the related valve at Awaiting Overhaul position is closed, maintenance department's place local pipe networks is separated with the extensive network of normal operation, form the separate portions of a relative closure, at this moment, the user continues to use combustion gas in this zone, as far as possible the gaseous-pressure in this control area pipeline is reduced.Treat that pressure is reduced to a certain degree (the normal use of user is affected preceding), close valve, stop air feed to the user to user's air feed.At this moment, pressure is still higher, does not meet the condition that maintenance needs.Therefore, ensuing operation then is: open the relevant valve that diffuses of separation valve door maintenance side in this zone, combustion gas is directly entered atmosphere, meet the requirements until pressure, begin maintenance.
Although this kind mode is quick and easy, there is open defect:
(1) wastes a large amount of energy
To compression ignite tracheae net in the Guangzhou in recent years in the upkeep operation process amount of diffusing of combustion gas add up, see the following form 2.
The amount of giving out of gas statistical form in the table 2:2004--2008 year Guangzhou in the compression ignite tracheae net upkeep operation process
| Time | Pipe network upkeep operation air consumption |
| 2004 | 17.0291 ten thousand m 3 |
| 2005 | 19.9856 ten thousand m 3 |
| 2006 | 21.2756 ten thousand m 3 |
| 2007 | 20.5949 ten thousand m 3 |
| 2008 | 17.8241 ten thousand m 3 |
Data as can be seen from table, the Guangzhou is compression ignite tracheae network planning mould in more than 2000 kilometer only, and the long running time limit of pipeline has only 20 years, can annual pipe network upkeep operation, the combustion gas of being diffused in vain but reaches nearly 20 ten thousand steres, not following 700,000 yuan/year of direct economic losses.Larger for other pipe network, the longer big city of the pipeline operation time limit, the amount of giving out of gas is more, and economic loss is bigger.
(2) pollutant atmosphere
Key component in the rock gas is methane (CH
4), be a kind of greenhouse gases.At present, China's removing carbon dioxide (CO
2) outer greenhouse gas emissions have occupied the first in the world.The direct discharging of combustion gas has strengthened the pressure of environment carrying undoubtedly.In recent years, carbon dioxide, methane isothermal chamber gas purging amount constantly increased, and made the greenhouse effect of earth surface constantly strengthen, and caused global temperature to raise.The warm winter that greenhouse effect bring, might cause the farmland disease insect pest to grow, melt in damage caused by a drought aggravation, south poles glacier, and then make that sea level rise etc., the combustion gas directly adverse consequences of discharging is conspicuous.
(3) there is potential safety hazard
As everyone knows, the direct discharging of combustion gas is security incident such as initiation fire, blast very easily, is serious potential safety hazard.
(4) disturb residents
The direct discharging of combustion gas very likely produces some noises and pungent smell, and resident's psychology and physical and mental health are caused adverse effect.
Summary of the invention
The key point that solves above-mentioned these a series of problems is to avoid giving out of gas.Therefore, the combustion gas of being diffused in " reclaim and be used " traditional approach is the theme that the present invention considers.Simultaneously, expanding other further purposes of apparatus of the present invention as far as possible then is another important content.
The present invention just is being based on above-mentioned consideration, provides a kind of input cost device cheap, safe and reliable, easy to carry.Simultaneously, the present invention has adopted a kind of simple and direct, practical, advanced method, is exhausted into " diffusing combustion gas " of atmosphere before the economically feasible ground recovery channel upkeep operation and is used.Promptly, with this part combustion gas that be wasted in the traditional work mode, that atmosphere environment is polluted, that have potential safety hazard, after movably easy device is pressurizeed by one, " pour into " in the normal extensive network pipeline that moves and use for the user, substantially accomplish zero-emission, and stop the security incident generation.Simultaneously, this system also will realize multifunctional usage, expands the using scope and the field of foregoing invention patent relevant apparatus, improves performance.That is, said apparatus can also continue on for the follow-up work after the pipeline maintenance completion, such as, repair the displacement and the pressure test of completion back pipeline to overhauling the zone, ensure the quality of pipeline, the pipeline after guaranteeing to repair can put into effect safely.
In order to reach the foregoing invention purpose, the present invention has adopted following technological scheme: diffuse the recovering device of combustion gas in a kind of gas ductwork upkeep operation process, it is characterized in that comprising: a pressurization device is provided with a suction port and a relief opening; Reach an air inlet pipeline, a gas exhaust piping, a maintenance lateral line, an operation lateral line, described maintenance lateral line is connected by control valve 81 with described air inlet pipeline, described operation lateral line is connected by control valve 82 with described gas exhaust piping, described maintenance lateral line 21, operation lateral line 31 the other ends are connecting flexible pipe 4 or 5 respectively, 30 of maintenance lateral line 21 and gas exhaust pipings are connected by control valve 83, move 20 of lateral line 31 and air inlet pipelines and are connected by control valve 84; And an inert gas bomb, be connected in described maintenance lateral line 21 by control valve 86; And an atmosphere suction port, be connected in described air inlet pipeline 20 by control valve 85.
Diffuse the recovery method of combustion gas in a kind of gas ductwork upkeep operation process, used above-mentioned recovering device and carried out following steps operations successively and carry out combustion gas and reclaim:
(A) determine that according to the Awaiting Overhaul position plan needs the Awaiting Overhaul pipe network zone that isolates;
(B) close relevant separating valve, a wherein side of separating valve is the maintenance side that is positioned at described Awaiting Overhaul pipe network zone, and opposite side is the operation side that is positioned at operating combustion gas extensive network;
(C) the pipe network combustion gas in described Awaiting Overhaul pipe network zone continues to use for the user, with reduction gaseous-pressure to a predetermined value;
(D) close gas control valve door, stop user's air feed to described Awaiting Overhaul pipe network zone towards the user;
(E) suction port and the relief opening with described recovering device is connected to the maintenance side of described separating valve and moves side by pipeline;
(F) start pressurization device, extract combustion gas in the Awaiting Overhaul pipe network zone of described maintenance side out pressurization and import in the combustion gas extensive network of described operation side and use for the user;
When (G) pipeline pressure for the treatment of described Awaiting Overhaul pipe network zone was reduced to a certain tentation data, the compressor of pressurization device was out of service;
(H) pipe network to described Awaiting Overhaul pipe network zone overhauls.
Concretely, the present invention's the combustion gas recycling system of diffusing possesses following fundamental function:
1) pressurization device in the system can be extracted the combustion gas in the Awaiting Overhaul zone duct that has sealed out fast, is forced into the pressure that requires, and uses for the user in " pouring into " contiguous big gas ductwork that is moving;
2) pressurization device in the system is provided with suction pressure lower bound interlock protection function, guarantees that Awaiting Overhaul zone duct internal pressure remains micro positive pressure, avoids being evacuated and air is scurried in this zone constitute dangerous;
3) driving source of the pressurization device in the system both can be an electric power, also can be combustion gas, did not have the situation of power supply to adapt to part maintenance area;
4) the system architecture compactness is easy for installation, all devices all be assembled in one movably the sled in.Each device volume is small and exquisite, in light weight in the sled, and conveniently moving;
5) system has explosion prevention function, and the reliability height can move at explosion-proof area;
6) inert gas storaging devices such as nitrogen that are used to replace are equipped with in the system;
7) pressurization device can be produced pressurized air, can realize displacement and purging to the maintenance zone duct;
8) can realize maintenance leak test of zone duct and pressure test etc.
Description of drawings
Fig. 1 diffuses combustion gas recycling system fundamental diagram.
Fig. 2 is the quick connector fundamental diagram.
Fig. 3 is the quick connector structural representation.
Fig. 4 is the pipeline connection diagram.
Fig. 5 is a pressure pipe net maintenance case schematic representation in certain city's rock gas.
Embodiment
The present invention carries out constructing operation according to the following steps:
(1) determines that according to the Awaiting Overhaul position plan needs the Awaiting Overhaul pipe network zone that isolates;
Accompanying drawing 1 diffuses combustion gas recycling system working principle sketch for the present invention.
Valve A, B, C are the separation valve door on the gas pipe network pipeline, and each valve both sides is provided with diffuses control valve (A1, A2; B1, B2; C1, C2) and diffuse channel, the closed area that is surrounded by these three valves is Awaiting Overhaul pipe network zone 100, the combustion gas extensive network of the outside for moving.Closing, opening, the isolation and the UNICOM of realization maintenance zone and operation area by separation valve door A, B, C.
(2) close relevant separating valve, a wherein side of separating valve is the maintenance side that is positioned at described Awaiting Overhaul pipe network zone, and opposite side is the operation side that is positioned at operating combustion gas extensive network; According to field condition, contrive equipment 200 can place any place of separation valve door A, B, C, and diffuse valve A2, B2, the C2 that are positioned at the maintenance side can be used as the suction port that contrive equipment " bleeds " or purge relief opening, displacement relief opening.
According to engineering experience, in conjunction with statistics, roughly about 5000m, average caliber is about 350mm to the pipeline total length in Awaiting Overhaul zone.Press B level tubulation net in estimating with this, each inspection (robbing) is repaiied " diffusing " combustion gas total amount that must reclaim and is about 600m
3
(3) the pipe network combustion gas in described Awaiting Overhaul pipe network zone 100 continues to use for the user, with reduction gaseous-pressure to a predetermined value;
(4) close gas control valve door, stop user's air feed to described Awaiting Overhaul pipe network zone towards the user;
(5) suction port and the relief opening with contrive equipment is connected in the maintenance side of described separating valve and moves side with quick connector respectively by pipeline;
As shown in Figure 4,, comprise a pressurization device, be provided with a suction port and a relief opening for device 200 of the present invention; And an air inlet pipeline 20 and a gas exhaust piping 30; Reach a maintenance lateral line 21 and an operation lateral line 31, described 21 pipelines are connected by control valve 81 with described air inlet pipeline 20, and described operation lateral line 31 is connected by control valve 82 with described gas exhaust piping 30; Described maintenance lateral line 21, operation lateral line 31 the other ends are connecting flexible pipe 4 or 5 respectively; 30 of maintenance lateral line 21 and gas exhaust pipings are connected by control valve 83, move 20 of lateral line 31 and air inlet pipelines and are connected by control valve 84; And an inert gas bomb, be connected in described maintenance lateral line 21 by control valve 86; And an atmosphere suction port, be connected in described air inlet pipeline 20 by control valve 85.
The withstand voltage metallic hose diameter that pressurization device is connected with air inlet, exhaust duct among the present invention is all selected 50mm for use, is equipped with quick connector and realizes being connected fast with diffuse channel is, so that save the installation time.The withstand voltage metallic hose of aforementioned arrangements can be respectively be complementary with the diffuse channel of 50～150mm bore, need not to change because of the diffuse channel caliber is different the metallic hose that is attached thereto, only the need conversion quick connector coupling part corresponding with the diffuse channel bore.
As Fig. 2, shown in Figure 3, be the structure of quick connector 9.Edge joint device 9 one ends are connected with withstand voltage metallic hose 4 or 5 fast, and the other end is a joint part, then is connected with diffuse channel 10 or 11.Quick connector comprises connector body 91, set screw nut 94, tightening nut 93, tie rod 95 etc., connector body 91 is set to tapered slope with the side that diffuse channel joins, tapered slope is provided with " O " RunddichtringO 96 that seals, cone seal plug 92 end faces are equipped with resilient pad, and tightening nut 93 is tightened and is fixed in connector body 91.Tighten tightening nut 93, drive cone seal plug 92 by tie rod 95 and closely contact, guarantee that the gas in the diffuse channel 10 does not leak with the tapered slope of connector body 91.
But be fixed nut 94 fixed connector main bodys 91 on diffuse channel 10, guarantee not come off between quick connector 9, metallic hose 4 and the diffuse channel 10.The screw rod that is connected with set screw nut 94 directly is stuck on the diffuse channel 10, and diffuse channel 10 does not need any anticipating, and connection procedure does not need any special tool(s) yet.
The end that quick connector 9 is connected with withstand voltage metallic hose can be made into unified bore, an end that is connected with diffuse channel, i.e. and quick connector coupling then is customized to the bore of several different sizes.During use, select the quick connector coupling specification that is suitable for according to the bore of diffuse channel.The adapter connector of different size by identical cassette interface, can be connected fast with the withstand voltage metallic hose of same specification.
The quick connector working principle:
Select the quick connector coupling corresponding with the diffuse channel bore, it is connected by cassette interface with withstand voltage metallic hose, joint is inserted on the diffuse channel, be fixed nut 94, quick connector coupling closely is connected with diffuse channel, prevents that quick connector from coming off from diffuse channel because of pressure-bearing.Regulate the tightening nut 93 on the tie rod, the resilient pad on the cone seal plug 92 is closely contacted with " O " RunddichtringO 96 on the quick connector main body conical surface, avoid the interior gas leak of pipeline by tie rod 95.
(6) behind the proper operation related valve, start pressurization device, extract combustion gas in the Awaiting Overhaul pipe network zone of described maintenance side out pressurization and import in the combustion gas extensive network of described operation side and use for the user;
The driving source of apparatus of the present invention compressor divides two kinds, and a kind of is the electric drive type, and another kind is the gas driven type.
Electric drive type: divide the band diesel generator and be not with two kinds of diesel generators, can adopt home equipment.The maintenance zone civil power is arranged, select the pressurization device of not being with generator for use, with civil power as compressor power; The no commercial power supply in maintenance zone is then selected the pressurization device of being with diesel generator for use, and self generating is as compressor power.For power-actuated compressor, can select imported product or homemade " rock gas technology booster compressor " for use.The available model of homemade compressor has VW-10/ (0-0.05)-18 etc., and its important technological parameters is as follows:
Applicable media: rock gas, air, nitrogen etc.; Flow: 10m
3/ min; Power, 90kw; Suction pressure, normal pressure～0.05MPa; Exhaust pressure: 1.8MPa; Main frame boundary dimension: 2300 x, 1600 x 1550mm; Whole machine weight: 3200kg.
Gas driven type: adopt external imported product, be applicable to the no civil power in maintenance zone, also do not have the occasion of diesel generator power supply, adopt the power of the interior combustion gas of pipeline nearby as Driven Compressor.For compressor by gas driven, can only select imported product for use at present, produce gas compressor such as the U.S., Japan, Germany, the just combustion gas in operating extensive network is taken from the combustion gas of Driven Compressor nearby.
Diffuse being controlled at cumulative time (that is, " bleeding " time) within 1 hour of gas process according to recovery and consider that the rated flow of pressurization device is defined as 10m among the present invention
3More than/the min.
Whole pressurizing system adopts the explosion-proof type design, meets relevant national standard, can avoid in the upkeep operation process security incident taking place.
When (7) pipeline pressure for the treatment of described Awaiting Overhaul pipe network zone was reduced to a certain tentation data, the compressor of pressurization device was out of service;
(8) described Awaiting Overhaul pipe network is overhauled.
In addition, system disposition has monitoring instruments such as gas leakage alarm equipment, oxygen content on-line detector, methane content fast detecting instrument, pressure and temp display instrument, fuel gases calorific value quick analytic instrument, finishes essential analysis and detection.
Be illustrated in figure 4 as pipeline of the present invention and connect signal.The present invention is provided with control valve 83,84 and other valve of being used for " function conversion " between compressor air inlet and relief opening.By operation to related valve, realize that metallic hose 4,5 place passages are as the switching between gas-entered passageway or the exhaust passage, and the switching of functions such as air pressurized, inert gas replacement, satisfy " bleeding " (recovery combustion gas), " pneumatics " (pressurized air purges and pressure test) and " displacement " function conversion demands such as (inert gas injections).
Concrete function corresponding valve position is respectively:
The pattern of " bleeding ": valve 81,82 is opened, and valve 83,84,85,86 is closed;
" pneumatics " pattern: valve 83,85 is opened, valve 81,82,84,86 is closed, and at this moment, the passage at metallic hose 4 places is " exhaust " passage, the pressurized air of contrive equipment compressor production enters the regional pipe network pipeline of maintenance by this passage, realizes purging and the pressure test function.Under this pattern, compressor is to air pressurized, be that compressor is except that can reclaiming the rock gas pressurization in the maintenance zone duct, by the control valve on first connecting pipeline is operated, and do not need to change connecting tube, just can pressurize, as medium, service conduits be purged and pressure test with pressurized air to air;
" displacement " pattern: valve 86 is opened, and valve 81,82,83,84,85 is closed.At this moment, the high-pressure nitrogen bottle group of laying in the contrive equipment or other inert gas storaging devices by the passage at corresponding decompressor and metallic hose 4 places, provide inert gas to be used for displacement for overhauling the zone.
Now specify the practical application of above-mentioned three kinds of patterns:
(1) diffuses combustion gas and reclaim (the direct maintenance mode of inflammable gas)
(1) according to the concrete position that needs service conduits, determine the pipeline control valve door that plan is closed, the concrete scope in clear and definite Awaiting Overhaul zone reaches and the pipe network zone that needs to isolate.
(2) close related valve according to predetermined repair schedule, the pipe network and the big gas ductwork that is moving in Awaiting Overhaul zone are isolated.
(3) continue to use combustion gas in the pipeline by means of the user in the pipe network of Awaiting Overhaul zone, the gaseous-pressure of the Awaiting Overhaul zone pipe network of having isolated is progressively reduced.
(4) at preset time, treat that pressure is reduced to tentation data, then close gas control valve door towards the user, the user who stops in the pipe network of Awaiting Overhaul zone supplies combustion gas.
(5) select to be connected with withstand voltage metallic hose with the quick connector coupling of diffuse channel bore coupling.
(6), connect by means of quick connector with the diffuse channel of separation valve door both sides with the withstand voltage metallic hose of 1 suction port of the pressurization device among the present invention and relief opening.Open the control valve that diffuses of these separation valve door both sides, and pressurization device is placed " bleeding " pattern: promptly, valve 81,82 is opened, and valve 83,84,85,86 is closed.
(7) start pressurization device 1, extract combustion gas in the pipe network pipeline of Awaiting Overhaul zone out pressurization, and use for the user in the extensive network moved of " pouring into " operation side.
(8) be reduced to tentation data at Awaiting Overhaul zone ductwork pressure, the action of pressurization device lower bound pressure interlocking protective device, compressor (also can adopt manual control) out of service automatically.This stage needs to pay close attention to Awaiting Overhaul zone pipe network internal pressure situation, avoids pipe network negative pressure condition to occur.
(9) close separation valve door maintenance side and move the control ball valve of being sidelong on the pipeline that looses, begin upkeep operation, finish until the maintenance task according to the manufacturing operation scheme.
The complete overhaul process is " zero-emission " basically.
(2) inert gas replacement maintenance mode
(1) according to the concrete position that needs service conduits, determine the pipeline control valve door that plan is closed, the concrete scope in clear and definite Awaiting Overhaul zone reaches and the pipe network zone that needs to isolate.
(2) close related valve according to predetermined repair schedule, the pipe network and the big gas ductwork that is moving in Awaiting Overhaul zone are isolated.
(3) continue to use combustion gas in the pipeline by means of the user in the pipe network of Awaiting Overhaul zone, the gaseous-pressure of the Awaiting Overhaul zone pipe network of having isolated is progressively reduced.
(4) at preset time, treat that pressure is reduced to tentation data, then close gas control valve door towards the user, the user who stops in the pipe network of Awaiting Overhaul zone supplies combustion gas.
(5) select to be connected with withstand voltage metallic hose with the quick connector coupling of diffuse channel bore coupling.
(6), connect by means of quick connector with the diffuse channel of separation valve door both sides with the withstand voltage metallic hose of 1 suction port of the pressurization device among the present invention and relief opening.Open the control valve that diffuses of these separation valve door both sides, and pressurization device is placed " bleeding " pattern: promptly, valve 81,82 is opened, and valve 83,84,85,86 is closed.
(7) start pressurization device 1, extract combustion gas in the pipe network pipeline of Awaiting Overhaul zone out pressurization, and use for the user in the extensive network moved of " pouring into " operation side.
(8) be reduced to tentation data at Awaiting Overhaul zone ductwork pressure, the action of pressurization device lower bound pressure interlocking protective device, compressor (also can adopt manual control) out of service automatically.This stage needs to pay close attention to Awaiting Overhaul zone pipe network internal pressure situation, avoids pipe network negative pressure condition to occur.Occur if any negative pressure, then stop the pressurization device operation immediately, suitably open the UNICOM's valve between pressurization device suction port and the relief opening, utilize the combustion gas that is moving extensive network to inject, make Awaiting Overhaul zone ductwork pressure keep micro positive pressure.
Replace according to the following steps then:
(9) close separation valve door and move the control ball valve of being sidelong on the pipeline that looses.
(10) pressurization device with the present invention switches to " displacement " pattern.That is, pressurization device is carried out following operation: valve 86 is opened, and valve 81,82,83,84,85 is closed.
That (11) opens pressurization device place separation valve door maintenance side diffuses the control ball valve, slowly opens the control valve that diffuses of other separation valve door maintenance side, with the combustion gas in the inert gas replacement Awaiting Overhaul zone duct.
(12) behind the displacement end-of-job, begin upkeep operation, finish until the maintenance task according to the manufacturing operation scheme.
(3) pipeline purges and pressure test
After the maintenance task is finished, the pipeline that overhauled is purged and pressure test as need, then:
That (1) opens pressurization device place separation valve door maintenance side diffuses the control ball valve, and the present invention's pressurization device knot is changed to " pneumatics " pattern.That is, pressurization device is carried out following operation: valve 83,85 is opened 81,82,84,86 valve closings.
(2) start pressurization device, this moment, pressurization device began air pressurized, operated the valve that diffuses that other separation valve door is positioned at the maintenance side, the pressurized air that utilizes above-mentioned pressurization device to produce, the pipe network system of overhauling the completion pipeline is purged remaining foreign material and impurity in the discharge conduit.
(3) after purging work is finished, close the above-mentioned valve that diffuses, utilize pressurized air that Leak testtion and pressure test are carried out in the service conduits position.
(4) after Leak testtion and pressure test finish, open separation valve door, make regional pipe network of maintenance and the extensive network UNICOM that is moving, pressure is raised to a certain degree, short time is opened the valve that diffuses at other separation valve door place, " combustion gas+air " mixed gas of staying in the pipeline is emitted a part, with the combustion gas displaced air until qualified.
(5) close and diffuse valve, the pipe network that overhauled formally puts into operation.The quick connector of dismounting pressurization device and diffuse channel.So far, whole purging and pressure test task are finished.
Embodiment 1
With pressure pipe net maintenance process in certain rock gas of certain city is example, and the concrete effect of apparatus of the present invention is described.Accompanying drawing 5 is a pressure pipe net maintenance case schematic representation in certain city's rock gas.
One, basic condition
(1) maintenance place: pressure pipe road in certain highway section rock gas, caliber are 400mm;
(2) maintenance reason: because of corrosive pipeline, detecting this segment pipe has slight leakage phenomenon;
(3) maintenance position and area of isolation:
Maintenance position: be positioned at " doing Y57 " valve 500m scope in the south.
Area of isolation: because " do Y57, do X1626 " valve closing is not tight, area of isolation be extended to " do Y56---do X1625---X1215------doing X1627---X1009 that does Y58 " whole zone that valve surrounded, be the Awaiting Overhaul zone of this repair schedule.
In this closed area, caliber is that the pipeline of 500mm is total to 1859m, and caliber is that the pipeline of 400mm is total to 2150m, and caliber is that the pipeline of 250mm is total to 462m, and caliber is that the pipeline of 200mm is total to 366m.Pipe network running pressure is a B level system, and actual motion pressure is 0.16MPa, and callable " diffusing " combustion gas total amount is about 620m
3
(4) service conduits: certain highway section DN400mm pipeline, leak source is more.
(5) pressurization device rest: according to field condition, pressurization device is placed on separation valve door " dried Y56 " and locates, the pressurization device suction port is connected with the diffuse channel that diffuses valve 56B by withstand voltage metallic hose, and relief opening is connected with the diffuse channel that diffuses valve 56A by withstand voltage metallic hose.
(6) pressurization device drives power: select the pressurization device of band diesel generator for use, provide the running of electric drive pressurization device by diesel generator.
(7) maintenance mode: because the maintenance zone is wider, and exist air directly to enter the interior possibility of pipeline in the maintenance process, therefore, for safety, adopt the inert gas replacement maintenance mode.
Because maintenance workload is big, exist impurity to enter possibility in the pipeline in the maintenance process, therefore, after upkeep operation is finished, need purge and carry out pressure test pipeline.
(8) pressurization device is selected home equipment for use---and " rock gas technology booster compressor ", model is VW-10/ (0-0.05)-18, is produced by great Shen special gas Compressors Factory.
(9) system adopts the explosion-proof type design, and withstand voltage metallic hose adopts quick-mountable pipe jointer with being connected of diffuse channel.
Two, basic step
1) 0:00, close " do Y56, dried X1625, an X1215, dried Y58, do X1627, an X1009 " valve according to predetermined repair schedule, the pipe network in Awaiting Overhaul zone is effectively isolated with the big gas ductwork that is moving, form " dried Y56---do X1625---X1215------doing X1627---props up X1009 to do Y58 " closed area, i.e. maintenance zone.
2) continue to use combustion gas in the pipeline by means of the user in the pipe network of Awaiting Overhaul zone, the gaseous-pressure of the Awaiting Overhaul zone pipe network of having isolated is progressively reduced.
3) 0:30, pressure is reduced to tentation data, closes all the gas control valve doors towards the user, and the user who stops in the pipe network of Awaiting Overhaul zone supplies combustion gas.
4) with the withstand voltage metallic hose of pressurization device suction port among the present invention and relief opening, the both sides diffuse channel (diffuses the corresponding diffuse channel of valve 56A, 56B " to do Y56 " with separation valve door, caliber is 50mm), joint by means of the quick connector correspondence connects, and pressurization device placed " bleeding " pattern: 56A, 56B valve opening, valve 81,82 is opened, and valve 83,84,85,86 is closed.
5) start pressurization device, extract combustion gas in the pipe network pipeline of Awaiting Overhaul zone out pressurization by diffusing valve 56B, and deliver in the extensive network of moving and use for the user by diffusing valve 56A.
4) 1:45 overhauls regional ductwork pressure and is reduced to tentation data, the action of pressurization device lower bound pressure interlocking protective device, and compressor is out of service automatically.
5) close separation valve door and move the control ball valve 56A that is sidelong on the pipeline that looses.Open nitrogen replacement control valve 86, valve 81,82,83,84,85 is closed.Utilize the nitrogen of laying in apparatus of the present invention to replace, promptly with the inert gas replacement inflammable gas, till displacement is qualified to overhauling regional pipe network
6) close diffusing of separation valve door maintenance side and control ball valve 56B, begin upkeep operation, finish until the maintenance task according to the manufacturing operation scheme.
That 7) opens pressurization device place separation valve door maintenance side diffuses control ball valve 56B, and the present invention's pressurization device is switched to " pneumatics " pattern.Pressurization device is carried out following operation: valve 83,85 is opened 81,82,84,86 valve closings.
8) start pressurization device, this moment, pressurization device began air pressurized, was positioned at the valve that diffuses of maintenance side in the operation maintenance zone, the pressurized air that utilizes above-mentioned pressurization device to produce, the pipe network system of overhauling the completion pipeline is purged remaining foreign material and impurity in the discharge conduit.
9) after purging work is finished, close this and diffuse valve, utilize pressurized air that Leak testtion and pressure test are carried out in the service conduits position.
After Leak testtion and pressure test finish, open separation valve door, make regional pipe network of maintenance and the extensive network UNICOM that is moving, pressure is raised to a certain degree, short time is opened near the valve that diffuses the maintenance department, " combustion gas+air " mixed gas of staying in the pipeline is emitted a part, with the combustion gas displaced air until qualified.
10) close and diffuse valve, the pipe network that overhauled formally puts into operation.The quick connector coupling of dismounting pressurization device and diffuse channel.So far, whole upkeep operation task is finished.
Three, effect
This maintenance process is saved rock gas 620m
3About, more than 2000 yuan of direct economic benefit importantly eliminated potential safety hazard, stopped combustion gas and directly entered atmosphere, obvious social benefit.
Claims (5)
1, diffuse the recovering device of combustion gas in the gas ductwork upkeep operation process, it is characterized in that comprising:
One pressurization device is provided with a suction port and a relief opening; And
One air inlet pipeline (20), a gas exhaust piping (30), a maintenance lateral line (21), an operation lateral line (31),
Described maintenance lateral line is connected by control valve (81) with described air inlet pipeline, described operation lateral line is connected by control valve (82) with described gas exhaust piping, described maintenance lateral line (21), operation lateral line (31) the other end are connecting flexible pipe (4) or (5) respectively, be connected by control valve (83) between maintenance lateral line (21) and gas exhaust piping (30), move between lateral line (31) and air inlet pipeline (20) and be connected by control valve (84); And
One inert gas bomb is connected in described maintenance lateral line (21) by control valve (86); And
One atmosphere suction port is connected in described air inlet pipeline (20) by control valve (85).
2, diffuse the recovery method of combustion gas in the gas ductwork upkeep operation process, it is characterized in that application rights requires 1 described recovering device to carry out the following steps operation successively and carries out the combustion gas recovery:
(A) determine that according to the Awaiting Overhaul position plan needs the Awaiting Overhaul pipe network zone that isolates;
(B) close relevant separating valve, a wherein side of separating valve is the maintenance side that is positioned at described Awaiting Overhaul pipe network zone, and opposite side is the operation side that is positioned at operating combustion gas extensive network;
(C) the pipe network combustion gas in described Awaiting Overhaul pipe network zone continues to use for the user, with reduction gaseous-pressure to a predetermined value;
(D) stop user's air feed to described Awaiting Overhaul pipe network zone;
(E) suction port and the relief opening with described recovering device is connected to the maintenance side of described separating valve and moves side by pipeline;
(F) behind the proper operation related valve, start described pressurization device, extract combustion gas in the pipe network of the Awaiting Overhaul of described maintenance side zone out pressurization, and import in the combustion gas extensive network of described operation side and use for the user;
When (G) the pipeline gas pressure for the treatment of described Awaiting Overhaul pipe network zone was reduced to a certain tentation data, the compressor of pressurization device was out of service;
(H) pipeline to described Awaiting Overhaul pipe network zone overhauls.
3, recovery method according to claim 2 is characterized in that: described step e connects by quick connector.
4, recovery method according to claim 2 is characterized in that: operate according to the following steps before step H maintenance:
(G1) close separation valve door and move the control ball valve of being sidelong on the pipeline that looses;
(G2) described pressurization device is switched to " displacement " pattern, pressurization device is carried out following operation: 86
#Valve opening, valve (81), (82), (83), (84), (85) are closed;
That (G3) opens pressurization device place separation valve door maintenance side diffuses the control ball valve, slowly opens the control valve that diffuses of other separation valve door maintenance side, with the combustion gas in the inert gas replacement Awaiting Overhaul zone duct.
5, recovery method according to claim 2 is characterized in that: operate according to the following steps after step H maintenance:
(H1) described pressurization device is switched to " pneumatics " pattern, pressurization device is carried out following operation: open valve (83), (85), and valve (81), (82), (84), (86) are closed;
(H2) start described pressurization device, utilize the pressurized air of above-mentioned pressurization device production that the pipe network system of overhauling the completion pipeline is purged;
(H3) utilize pressurized air that Leak testtion and pressure test are carried out in the service conduits position;
(H4) behind Leak testtion and the pressure test end-of-job, open separation valve door, make regional pipe network of described maintenance and the extensive network UNICOM that is moving, pressure is raised to a certain degree, short time is opened the valve that diffuses at other separation valve door place, " combustion gas+air " mixed gas of staying in the pipeline is emitted a part, with the combustion gas displaced air until qualified;
(H5) close and diffuse valve, the pipe network that overhauled formally puts into operation.
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| CN200910037697A CN101509605B (en) | 2009-03-09 | 2009-03-09 | Method for recovering relief gas in process for examining and repairing gas pipe network and device thereof |
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| CN200910037697A CN101509605B (en) | 2009-03-09 | 2009-03-09 | Method for recovering relief gas in process for examining and repairing gas pipe network and device thereof |
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| CN102830725A (en) * | 2012-08-13 | 2012-12-19 | 中国人民解放军海军医学研究所 | Pressurization control method |
| CN102854902A (en) * | 2012-08-13 | 2013-01-02 | 中国人民解放军海军医学研究所 | Chamber pressure adjusting method |
| CN104235604A (en) * | 2014-09-11 | 2014-12-24 | 华南理工大学 | Device and method for recycling diffused gas in pipe network by using ANG (Adsorbed Natural Gas) technique |
| CN109063848A (en) * | 2018-06-27 | 2018-12-21 | 广州发展集团股份有限公司 | Estimate method and gas pipeline repair method that Awaiting Overhaul region stops service life |
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| FR2885992B1 (en) * | 2005-05-17 | 2007-06-29 | Air Liquide | METHOD FOR ENHANCING PRODUCT LEAKAGE IN COMPRESSOR SEALING SYSTEMS BY RECOVERING AND RECYCLING AS A FUEL |
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| CN102830725A (en) * | 2012-08-13 | 2012-12-19 | 中国人民解放军海军医学研究所 | Pressurization control method |
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| CN102854902B (en) * | 2012-08-13 | 2015-03-04 | 中国人民解放军海军医学研究所 | Chamber pressure adjusting method |
| CN102830725B (en) * | 2012-08-13 | 2015-09-23 | 中国人民解放军海军医学研究所 | A kind of pressure control method |
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| CN109488884A (en) * | 2019-01-14 | 2019-03-19 | 长江大学 | A kind of device that gives out of gas of anti-leak |
| CN114352940A (en) * | 2021-12-23 | 2022-04-15 | 广州燃气集团有限公司 | Device and method for shutting down gas for gas pipeline |
| CN115325451A (en) * | 2022-07-06 | 2022-11-11 | 深圳市燃气集团股份有限公司 | A gas pipeline release system and release method thereof |
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Effective date of registration: 20160524 Address after: 300461, No. 129, No. 2, No. ten, Haibin Road, Tianjin Free Trade Zone, A4126 Patentee after: TIANJIN WAH SANG GAS INDUSTRY CO.,LTD. Address before: 510635, room 205, No. 402 Longkou East Road, Guangdong, Guangzhou Patentee before: Luo Dongxiao |
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Address after: 300461 Tianjin free trade test zone (Tianjin Port Free Trade Zone), No. 2, No. 129, No. 2, No. 129, No. 129, seashore Patentee after: TIANJIN TAIDA BINHAI CLEANING ENERGY GROUP CO.,LTD. Address before: 300461 Tianjin free trade test zone (Tianjin Port Free Trade Zone), No. 2, No. 129, No. 2, No. 129, No. 129, seashore Patentee before: Tianjin Taida Binhai clean energy Co.,Ltd. |
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Address after: 300461 Tianjin free trade test zone (Tianjin Port Free Trade Zone), No. 2, No. 129, No. 2, No. 129, No. 129, seashore Patentee after: Tianjin Taida Binhai clean energy Co.,Ltd. Address before: 300461, No. 129, No. 2, No. ten, Haibin Road, Tianjin Free Trade Zone, A4126 Patentee before: TIANJIN WAH SANG GAS INDUSTRY CO.,LTD. |