CN205392094U - Natural gas transmission & distribution pipeline residual air recovery system - Google Patents
Natural gas transmission & distribution pipeline residual air recovery system Download PDFInfo
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- CN205392094U CN205392094U CN201620169536.0U CN201620169536U CN205392094U CN 205392094 U CN205392094 U CN 205392094U CN 201620169536 U CN201620169536 U CN 201620169536U CN 205392094 U CN205392094 U CN 205392094U
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- pipeline
- methane
- air inlet
- natural gas
- absorption tower
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Abstract
The utility model belongs to the natural gas residual air field of retrieving specifically provides a natural gas transmission & distribution pipeline residual air recovery system and has mainly compriseed air inlet pipeline, absorption tower system, methane emission pipeline and nitrogen gas emission pipeline, the top of adsorbing the tower system is equipped with the gas outlet, and the bottom is equipped with air inlet and its inside methane adsorption equipment that is equipped with, the air inlet pipeline with the air inlet intercommunication that adsorbs the tower system, nitrogen gas discharge the pipeline with the gas outlet intercommunication that adsorbs the tower system, methane discharge the pipeline with the air inlet intercommunication that adsorbs the tower system, the methane delivery pipe still is equipped with the vacuum pump on the road. The beneficial effects of the utility model are that: be used for methane, nitrogen gas separation technology after the natural gas transmission & distribution pipeline nitrogen gas replacement operation with the pressure swing adsorption technique first. Can realize that the recovery of methane is recycled in the pipeline residual air, economic value is showing. Can reduce to the emission of the methane in the atmosphere, protect the environment, the value of environmental protection is showing.
Description
Technical field
This utility model belongs to natural gas residual air and reclaims field, is specifically related to a kind of natural gas transmission and distribution pipeline residual air recovery system.
Background technology
Natural gas has inflammable and explosive feature, for guaranteeing natural gas line weld job safety, is fallen by combustion of natural gas in pipe firstly the need of making to apply a torch, then pass to the nitrogen residue natural gas to displace in pipeline in practical operation.The end of job to be welded, needs natural gas slowly imports the pipe network being complete welding before recovering supply, by diffusing nitrogen release in pipe, until natural gas reaches air supply requirement.In order to remaining nitrogen in pipeline is derived, widespread practice is by opening the mixing gas (methane, nitrogen) that pipe network end diffusion valve discharges in pipeline, pipeline external is penetrated at a high speed along with mixed airflow, residue nitrogen in pipeline also goes out with airflow injection, through after a period of time, when methane content gradually rises up to meet air supply requirement in pipe network, diffusion valve can be closed, replace the end of job.
Based on above scheme, existing way needs before having the disadvantage that weld job pipe amount of ram methane gas is implemented burning, weld job terminates to need to discharge a large amount of natural gas, nitrogen mixed gas meets air supply requirement to the concentration guaranteeing natural gas, two stages had both caused energy waste, formed again atmospheric pollution.
Utility model content
In order to solve the problems referred to above that prior art exists, this utility model provides one can efficient recovery pipeline residual air natural gas transmission and distribution pipeline residual air recovery system, it is achieved that resource reutilization saves the energy, protects environment.
Natural gas transmission and distribution pipeline residual air recovery system of the present utility model is mainly made up of air inlet pipeline, absorption tower system, discharge of methane pipeline and nitrogen discharge pipeline；The top of described absorption tower system is provided with gas outlet, and bottom is provided with air inlet, and the inside of described absorption tower system is provided with methane adsorption device；Described air inlet pipeline connects with the air inlet of described absorption tower system, and described nitrogen discharge pipeline connects with the gas outlet of described absorption tower system, and described discharge of methane pipeline connects with the air inlet of described absorption tower system, and described discharge of methane pipeline is additionally provided with vacuum pump.Described methane adsorption device can adsorbed methane, and the methane of absorption can be discharged under evacuation pressure-lowering condition, optional as one, the adsorbent that can load in adsorbent equipment is activated carbon.Obvious, according to industry universal way, the break-make in order to realize each section of pipeline controls, it is possible to adding, at the conduit positions needed, the control valve that control piper opens and closes, this is industry universal means, limits no longer one by one and repeats.Vacuum pump is mainly used in the regeneration of adsorbent, it is also ensured that farthest reclaims gas product methane, improves the work efficiency of device.
System of the present utility model run based on principle be: natural gas, nitrogen mixed gas are passed through adsorbent equipment, in adsorption tower, the adsorbed agent absorption of component that the absorbabilitys such as methane are stronger, adsorbed methane obtains desorbing at bed by evacuation, being entered municipal administration gas distributing system when stripping gas is enriched to certain amount (when surge tank pressure is close to 0.3MPa), the gas such as not adsorbed nitrogen exports out-of-bounds emptying as purge gas.In different time sections, in adsorption tower, sequentially pass through the main operational steps such as absorption, blood pressure lowering, evacuation.The natural gas transmission and distribution pipeline residual air recovery system provided by this utility model is capable of in pipeline residual air the absorption of methane, after methane adsorption ratio is up to standard, the remaining residual air based on nitrogen is directly discharged.Then control the methane of pressure-lowering condition release absorption, the methane gas being main constituent with methane can be obtained again, supply natural gas network, it is achieved the recycling of resource.Owing to greatly reducing to the methane emission in air, so protecting environment, the value of environmental protection is huge.
In order to realize producing continuously and healthily, it is preferable that improving, described absorption tower system is made up of two adsorption towers in parallel；Each adsorption tower all sets out QI KOU and by this gas outlet and nitrogen discharge pipeline connection on its top, and each adsorption tower is offered air inlet and is connected with described discharge of methane pipeline and described air inlet pipeline respectively by this air inlet in its bottom.Two adsorption towers can realize alternating sorbent, alternately discharge methane, namely during an adsorption tower absorption pipeline residual air, the methane of another adsorption tower blood pressure lowering evacuation release absorption, after the absorption of First adsorption tower is saturated, it is adjusted to release Methane Mode, then an other adsorption tower is changed into absorption mode.It is achieved in that continuous production, has greatly improved pipeline residual air and reclaim adsorption efficiency.
Advantageous embodiment, the gas outlet, top of two described adsorption towers by first connecting tube connection, and described first connecting tube be respectively arranged at two ends with an electromagnetic valve.
Advantageous embodiment, the two ends of described vacuum pump are by the second connecting tube connection, and described second connecting tube is provided with electromagnetic valve.
Advantageous embodiment, the inlet end of described air inlet pipeline is provided with filter.The filter set up can remove impurity, ensures the cleanliness factor of the mixing gas entered in adsorption tower, and then extends the service life of adsorption tower internal adsorption device.
In order to maintenance system is stable, it is preferable that improving, the described air inlet pipeline between described filter and described absorption tower system is provided with surge tank.The surge tank herein set up can maintain the stable gas pressure of admission line inlet end, safeguards device systems safety.
In order to increase system stability further, it is preferable that improving, the described air inlet pipeline between described surge tank and described absorption tower system is provided with compressor.The gas pressure of entrance adsorption tower can substantially remain in after compressor compresses and be not less than 2.5MPa, and when being conducive to adsorbing tower system particularly two adsorption towers, stablizing of cycle operation carries out.
In order to increase system stability further, it is preferable that improving, the exhaust end of described discharge of methane pipeline is provided with Pressure gauge and surge tank.The Pressure gauge herein set up can monitor the pressure condition of the exhaust end of discharge of methane pipeline, and the surge tank herein set up can maintain the stable gas pressure of exhaust end herein, safeguards device systems safety.
Advantageous embodiment, the exhaust end of described nitrogen discharge pipeline is provided with check-valves, and the described nitrogen discharge pipeline between described check-valves and described absorption tower system is additionally provided with methane content detector.The check-valves herein set up is possible to prevent gas backstreaming influential system stability and safety.The methane content detector set up can monitor the methane content herein discharging gas, so judge whether to have adsorbed qualified.Adsorbed recovery in view of the methane impossible 100% in mixing gas, therefore there is certain density methane in this part nitrogen, for guaranteeing job safety, need to cause apart from the position of at least 6 meters of this device by nitrogen by high-pressure rubber pipe and be arranged below natural gas leaking concentration detector at exhaust stack, the methane content around setting is detected；When the methane concentration that detector detects in surrounding reaches the 20% of LEL, detector alarm lamp glimmers and sends continuous prompt tone and reports to the police.Now, must take to expand fence coverage, explosion-proof fan is set and improve the safety measures such as exhaust stack height.Diffusion mouth distance ground is at least 1.5 meters.
Control to realize intelligent production, it is preferable that improve, also include controlling the PLC of all electromagnetic valves, analog-digital converter and computer；The air inlet place of described absorption tower system is provided with Pressure gauge and sequencing valve, and described sequencing valve, described analog-digital converter, described computer and the communication successively of described PLC connect.Sequencing valve obtains analogue signal by Pressure gauge, and this analogue signal is changed into digital signal and enters the recognized rear employing of computer by analog-digital converter, and then PLC performs the switching motion of each electromagnetic valve according to the logical order that system pre-sets.And then realize intelligent automatic control production.
Based on above technical scheme, the beneficial effects of the utility model are: pressure swing adsorption is used for natural gas transmission and distribution pipeline nitrogen displacement post-job methane, nitrogen separation technique first.Being capable of in pipeline residual air the recycling of methane, economic worth is notable.Can reducing to the discharge of methane in air, protect environment, the value of environmental protection is notable.Can realizing the continuous production that pipeline residual air reclaims, production efficiency is high.System stability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of natural gas transmission and distribution pipeline residual air recovery system of the present utility model.
In figure: 1 is adsorption tower；2 is filter；3 is surge tank；4 is compressor；5 is vacuum pump；6 is electromagnetic valve；7 is Pressure gauge；8 is methane content detector；9 is PLC；10 is analog-digital converter；11 is air inlet pipeline；12 is discharge of methane pipeline；13 is nitrogen discharge pipeline；14 is the first connecting tube；15 is the second connecting tube.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, this utility model is further elaborated.
As it is shown in figure 1, the natural gas transmission and distribution pipeline residual air recovery system of the present embodiment is mainly made up of air inlet pipeline 11, absorption tower system, discharge of methane pipeline 12 and nitrogen discharge pipeline 13；The top of described absorption tower system is provided with gas outlet, and bottom is provided with air inlet, and the inside of described absorption tower system is provided with methane adsorption device；Described air inlet pipeline 11 connects with the air inlet of described absorption tower system, described nitrogen discharge pipeline 13 connects with the gas outlet of described absorption tower system, described discharge of methane pipeline 12 connects with the air inlet of described absorption tower system, and described discharge of methane pipeline 12 is additionally provided with vacuum pump 5.
It is below to further improvement of the utility model:
It is mounted with activated carbon of sorbent in methane adsorption device.
Described absorption tower system is made up of two adsorption towers 1 in parallel；Each adsorption tower 1 is all set out QI KOU and is connected with nitrogen discharge pipeline 13 by this gas outlet on its top, and each adsorption tower 1 is offered air inlet and is connected with described discharge of methane pipeline 12 and described air inlet pipeline 11 respectively by this air inlet in its bottom.Further improving, the gas outlet, top of two described adsorption towers 1 is connected by the first connecting tube 14, and described first connecting tube 14 be respectively arranged at two ends with an electromagnetic valve 6.
The two ends of described vacuum pump 5 are connected by the second connecting tube 15, and described second connecting tube 15 is provided with electromagnetic valve 6.
The inlet end of described air inlet pipeline 11 is provided with filter 2.Further improving, the described air inlet pipeline 11 between described filter 2 and described absorption tower system is provided with surge tank 3.Further improving, the described air inlet pipeline 11 between described surge tank 3 and described absorption tower system is provided with compressor 4.Further improving, the exhaust end of described discharge of methane pipeline 12 is provided with Pressure gauge 7 and surge tank 3.
The exhaust end of described nitrogen discharge pipeline 13 is provided with check-valves, and the described nitrogen discharge pipeline 13 between described check-valves and described absorption tower system is additionally provided with methane content detector 8.
In order to realize intelligentized control method, improve further, also include controlling the PLC 9 of all electromagnetic valves, analog-digital converter 10 and computer；The air inlet place of described absorption tower system is provided with Pressure gauge 7 and sequencing valve, and described sequencing valve, described analog-digital converter 10, described computer and described PLC 9 communication successively connect.In figure: solid line is the signal of pipeline line, and dotted line " " is illustrated for circuit communication control electric wire.
Shown in accompanying drawing, more electromagnetic valve 6 can be set up according to required, to realize being precisely controlled smoothly of each section of pipeline.
The natural gas transmission and distribution pipeline residual air recovery system of previous embodiment specifically has following two occupation mode and use:
One, reclaim the mixing residual air of methane gas and nitrogen: pass in the present embodiment system by the mixing residual air in pipeline by air inlet pipeline 11, before accessing gas transmission pipeline net work, its pressure is monitored, ensure that gas product outlet side pressure is less than 0.3MPa, it is to avoid gas product hypertonia and current municipal gas pipeline is impacted.Then each valve of corresponding keying, makes air inlet pipeline 11, adsorption tower 1 connect with nitrogen discharge pipeline 13, and then makes mixing residual air pass sequentially through.Mixing residual air is by after adsorption tower 1, and the methane in mixing residual air is attracted in adsorption tower, and remaining mixing residual air, based on nitrogen, after methane content detection is qualified, gives off system by nitrogen discharge pipeline 13.After tower 1 adsorbent upon adsorption is saturated, open and close respective valves, adsorption tower 1 is connected with discharge of methane pipeline 12, start vacuum pump and build negative pressure lower pressure environment, make methane discharge from desorbing in the adsorbent equipment of adsorption tower 1, and be delivered to natural gas tube road network as energy resource supply use by discharge of methane pipeline 12.Meanwhile, in the system being equipped with two or more adsorption tower 1, multiple adsorption towers 1 can hocket the attached operation of Adsorption and desorption, it is achieved the continuous production that line-blending residual air reclaims.
Its two: recovery tube amount of ram residual air: during this purposes, owing to pipe amount of ram residual air is pure methane gas, it is possible to do not start not by adsorption tower 1, but either directly through air inlet pipeline 11 and discharge of methane pipeline 12 by feeding gas pipeline.
In a concrete application case of the present embodiment, utilize activated carbon for adsorbent, it may be achieved 300m3The separation of/h methane, nitrogen mixing residual air, the annual recyclable natural gas 9.6 × 10 of single device4Nm3, it is achieved economic worth 33.6 ten thousand yuan, create huge economic worth.Meanwhile, the methane of recovery is equivalent to 1440 tons of CO of reduction of discharging in an atmosphere2, the value of environmental protection is particularly evident.
This utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but in its shape or structure, do any change; every have same or like with the application like technical scheme, all fall within protection domain of the present utility model.
Claims (10)
1. a natural gas transmission and distribution pipeline residual air recovery system, it is characterised in that: mainly it is made up of air inlet pipeline (11), absorption tower system, discharge of methane pipeline (12) and nitrogen discharge pipeline (13)；The top of described absorption tower system is provided with gas outlet, and bottom is provided with air inlet, and the inside of described absorption tower system is provided with methane adsorption device；Described air inlet pipeline (11) connects with the air inlet of described absorption tower system, described nitrogen discharge pipeline (13) connects with the gas outlet of described absorption tower system, described discharge of methane pipeline (12) connects with the air inlet of described absorption tower system, and described discharge of methane pipeline (12) is additionally provided with vacuum pump (5).
2. natural gas transmission and distribution pipeline residual air recovery system according to claim 1, it is characterised in that: described absorption tower system is made up of two adsorption towers in parallel (1)；Each adsorption tower (1) is all set out QI KOU and is connected with nitrogen discharge pipeline (13) by this gas outlet on its top, and each adsorption tower (1) is offered air inlet and is connected with described discharge of methane pipeline (12) and described air inlet pipeline (11) respectively by this air inlet in its bottom.
3. natural gas transmission and distribution pipeline residual air recovery system according to claim 2, it is characterized in that: the gas outlet, top of two described adsorption towers (1) by the first connecting tube (14) connection, and described first connecting tube (14) be respectively arranged at two ends with an electromagnetic valve (6).
4. natural gas transmission and distribution pipeline residual air recovery system according to claim 1, it is characterized in that: the two ends of described vacuum pump (5) are by the second connecting tube (15) connection, and described second connecting tube (15) is provided with electromagnetic valve (6).
5. natural gas transmission and distribution pipeline residual air recovery system according to claim 1, it is characterised in that: the inlet end of described air inlet pipeline (11) is provided with filter (2).
6. natural gas transmission and distribution pipeline residual air recovery system according to claim 5, it is characterised in that: the described air inlet pipeline (11) between described filter (2) and described absorption tower system is provided with surge tank (3).
7. natural gas transmission and distribution pipeline residual air recovery system according to claim 6, it is characterised in that: the described air inlet pipeline (11) between described surge tank (3) and described absorption tower system is provided with compressor (4).
8. natural gas transmission and distribution pipeline residual air recovery system according to claim 6, it is characterised in that: the exhaust end of described discharge of methane pipeline (12) is provided with Pressure gauge (7) and surge tank (3).
9. natural gas transmission and distribution pipeline residual air recovery system according to claim 1, it is characterized in that: the exhaust end of described nitrogen discharge pipeline (13) is provided with check-valves, the described nitrogen discharge pipeline (13) between described check-valves and described absorption tower system is additionally provided with methane content detector (8).
10. according to the arbitrary described natural gas transmission and distribution pipeline residual air recovery system of claim 1～9, it is characterised in that: also include controlling the PLC (9) of all electromagnetic valves, analog-digital converter (10) and computer；The air inlet place of described absorption tower system is provided with Pressure gauge (7) and sequencing valve, and described sequencing valve, described analog-digital converter (10), described computer and described PLC (9) communication successively connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620169536.0U CN205392094U (en) | 2016-03-04 | 2016-03-04 | Natural gas transmission & distribution pipeline residual air recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620169536.0U CN205392094U (en) | 2016-03-04 | 2016-03-04 | Natural gas transmission & distribution pipeline residual air recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205392094U true CN205392094U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620169536.0U Expired - Fee Related CN205392094U (en) | 2016-03-04 | 2016-03-04 | Natural gas transmission & distribution pipeline residual air recovery system |
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| Country | Link |
|---|---|
| CN (1) | CN205392094U (en) |
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2016
- 2016-03-04 CN CN201620169536.0U patent/CN205392094U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20170304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |