CN108317398A - A kind of liquid ethane conveyance conduit pressure protective system and method - Google Patents
A kind of liquid ethane conveyance conduit pressure protective system and method Download PDFInfo
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- CN108317398A CN108317398A CN201810203115.9A CN201810203115A CN108317398A CN 108317398 A CN108317398 A CN 108317398A CN 201810203115 A CN201810203115 A CN 201810203115A CN 108317398 A CN108317398 A CN 108317398A
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- 239000007788 liquid Substances 0.000 title claims abstract description 41
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001681 protective effect Effects 0.000 title abstract 2
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000001052 transient effect Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a kind of liquid ethane conveyance conduit pressure protective system and method, system includes that throughout main line pump or valve bypass upper parallel arrangement of positive pressure bleed-off system and buffer brake bleed-off system.The present invention will be pumped in liquid ethane pipeline or main line valve event caused by pump or valve before pressure increment, or distance piece pressure increment caused by being increased by temperature, pass through the bleeder installed on exciting pump or valve shunts, automatically it releases into adjacent upstream and downstream main line, enter air to avoid superpressure medium, and limits the highest operating pressure of each pipeline section.The present invention not only eliminates the water attack On The Problem Of Overpressure under pipeline transient operation, medium ground temperature influences that volume change occurs and generates the influence to pipeline strength after also avoiding pipeline shutdown, not discharge system after superpressure medium is released, reduces the investment of affiliated facility, safe and environment-friendly, energy-efficient effect.
Description
Technical Field
The invention relates to a pressure protection system and method for a liquid ethane conveying pipeline.
Background
In recent years, petroleum and natural gas exploitation and petrochemical industries are rapidly developed, condensate gas fields are vigorously developed, natural gas auxiliary product extraction processes are continuously developed, and the source, processing and sale of natural gas liquid hydrocarbons (NGL) are increasing day by day.
The chemical components of the liquid ethane mainly comprise methane, ethane, propane and the like, wherein the mole fraction of the ethane can reach about 95%. The typical liquid ethane mixture has an extremely low bubble point (minus 80 ℃ and normal pressure) and a critical temperature of about 25-35 ℃, so that the liquid ethane mixture is easy to vaporize after leakage occurs. The liquid ethane has large evaporation latent heat, and a large amount of heat is absorbed when the liquid ethane volatilizes, so that the contact crowd is easily frostbitten; meanwhile, liquid ethane has high thermal expansion.
At present, the overpressure protection method adopted by a common oil pipeline mainly focuses on two ideas of arranging a water attack relief valve and a storage tank at the position of an easily overpressure pipe section and adopting pipeline strength protection. The water hammer relief valve is the most direct overpressure relief mode of liquid phase products, a medium enters an external storage tank through a relief valve to reduce the pressure of a pipeline, and the medium is stored in the storage tank, so that the mode has a direct protection effect, and the relief valve is automatically opened after the pressure exceeds a set pressure; the pipeline strength protection method is to consider that the mode of improving the design pressure of the system is adopted to carry out pressure protection through the most extreme pressure possibly generated by the pipeline which is judged in advance, and the mode has feasibility after the highest pressure is correctly predicted.
For liquid ethane transport pipelines, the two pressure protection methods described above have their respective disadvantages: for the method of water attack relief valve and storage tank, in view of the higher saturated vapor pressure of liquid ethane at normal temperature, the storage tank needs to adopt the pressurized design principle, which improves the manufacturing difficulty and cost of the storage tank and simultaneously provides challenge for the safety of the storage tank in remote areas; for the method of pipeline strength protection, as mentioned above, correctly judging the extreme pressure is a precondition for ensuring the pipeline safety, and for a large-caliber pipeline, increasing the design pressure may cause the pipeline cost to be greatly increased.
At present, the research on the special water hammer discharge of liquid ethane pipeline transportation is few, a reasonable water hammer control method needs to be deeply explored, and meanwhile, overpressure prevention measures caused by the temperature of the medium with higher expansibility need to be developed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a pressure protection system and a pressure protection method for a liquid ethane conveying pipeline, so that the liquid ethane pipeline can be quickly decompressed to a designed operation condition under an extreme working condition, and the safety of a pipeline system is ensured.
The technical scheme adopted by the invention is as follows: a pressure protection system for a liquid ethane conveying pipeline comprises a forward pressure relief system and a reverse pressure relief system which are arranged on a main line pump or a valve bypass in parallel, and overpressure medium storage tanks arranged at the upstream and the downstream of the pipeline system; the positive pressure relief system comprises a temperature sensor and a pressure sensor which are arranged on the main pipe pump or the valve bypass short section, and a ball valve, a positive pressure relief valve and a flow-limiting orifice plate which are connected with the main pipe pump or the valve bypass short section; the reverse pressure relief system comprises a temperature sensor and a pressure sensor which are arranged on the main pipe pump or the valve bypass short section, and a ball valve, a reverse pressure relief valve and a flow-limiting orifice plate which are connected with the main pipe pump or the valve bypass short section.
The invention also provides a pressure protection method for the liquid ethane conveying pipeline, which comprises the following steps:
(1) a forward pressure relief system and a reverse pressure relief system are arranged on each main line pump or valve bypass in parallel, and the set pressure of each forward pressure relief valve and each reverse pressure relief valve is set according to the highest allowable pressure possibly occurring in the operation of the pipeline;
(2) when a valve at a certain position in the pipeline is closed to cause water hammer and the set pressure of the positive pressure relief valve at the position is exceeded, overpressure medium enters a downstream pipeline through the positive pressure relief valve at the position;
(3) when the pressure rises due to the fact that the temperature rises after the delivery is stopped at a certain position in the pipeline and the set pressure of the forward pressure relief valve or the reverse pressure relief valve is exceeded, overpressure medium enters a downstream pipeline or an upstream pipeline through the forward pressure relief valve or the reverse pressure relief valve at the position;
(4) when the downstream or upstream pipeline receiving the discharge medium is also closed by a valve and overpressure occurs at the same time, a forward pressure discharge valve or a reverse pressure discharge valve corresponding to the valve is opened, and the overpressure medium continues to enter the adjacent pipe section until finally entering an overpressure medium storage tank arranged upstream and downstream of the pipeline system.
Compared with the prior art, the invention has the following positive effects: under the condition of deep analysis of the overpressure working condition of the liquid ethane pipeline, pressure relief bypasses are arranged in front of and behind a main line block valve causing water hammer and system isolation, so that the full-line highest pressure of the pipeline can be controlled, a discharge medium enters an adjacent pipeline, and functions of water hammer discharge, storage facilities and the like are avoided. The invention automatically discharges the pressure increment before the pump or the valve caused by the action of the pump or the main valve or the pressure increment of the isolation section caused by the temperature rise in the liquid ethane pipeline into the adjacent upstream and downstream main lines by exciting the discharge device arranged on the bypass of the pump or the valve so as to prevent overpressure medium from entering the atmosphere and limit the highest operating pressure of each pipe section; the forward and reverse discharge systems are arranged, so that the pressure balance of the pipeline under pressure fluctuation can be met. The invention is suitable for a liquid ethane conveying pipeline system, not only eliminates the problem of water hammer overpressure under the transient operation of the pipeline, but also avoids the influence on the pipeline strength caused by the volume change of the medium ground temperature influence after the pipeline stops conveying, and the overpressure medium is not discharged out of the system after being released, thereby reducing the investment of accessory facilities and achieving the effects of safety, environmental protection and energy saving.
The concrete expression is as follows:
(1) and (4) pressure safety:
the forward pressure relief system and the reverse pressure relief system are arranged on a main valve bypass pipeline, a pressure relief channel after the valve is closed is provided for the main pipeline, and overpressure medium is relieved to an adjacent pipeline through the bypass; the pressure of the relief system ensures that the pressure operating condition of the pipeline at any moment is lower than the design pressure of the pipeline; a cut-off ball valve is arranged on the bypass to provide the condition for periodically calibrating the pressure relief valve.
(2) Protection is proper:
the forward pressure relief system and the reverse pressure relief system that set up have included pressure relief valve and restriction orifice plate, have played the effect of pressure release and restriction simultaneously, and the parallel forward (or reverse) pressure relief system that sets up has further played the effect of reposition of redundant personnel, and furthest has reduced because of the excessive reduction of upstream pressure that the relief valve set back response time overlength caused.
(3) The redundancy is sufficient:
the parallel forward (or reverse) pressure relief system is provided with a large relief load margin, and sufficient safety redundancy is provided.
(4) Good economical efficiency:
the method of discharging overpressure medium to the adjacent pipeline by the bypass can eliminate the consideration of arranging an external discharge tank or improving the design pressure of the pipeline, also saves the design of fire prevention, safety and management of a discharge tank area, and saves a large amount of manpower and material resources.
(5) Full system cooperation:
the positive pressure relief system and the reverse pressure relief system are arranged on a main valve bypass at each position of the pipeline, and after overpressure relief at a certain position, a relief medium is jointly digested with a head station (tail station) storage tank through the residual pipeline capacity.
(6) Avoid adjacent pipeline low temperature:
the positive pressure discharge system and the reverse pressure discharge system discharge high-pressure pipeline media to adjacent pipelines under the water hammer working condition, and the problems of gas-liquid separation, low temperature of the pipelines and the like caused by the influence of decompression waves on the adjacent pipelines are solved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a liquid ethane transport pipeline pressure protection system of the present invention;
fig. 2 is a schematic diagram of the total system pressure protection of the liquid ethane transport pipeline of the present invention.
Detailed Description
A liquid ethane transport pipeline pressure protection system, as shown in fig. 1, comprising: the system comprises a bypass short joint 1, a ball valve 2, a pressure transmitter 3, a temperature transmitter 4, a forward first row pressure relief valve 5, a flow-limiting orifice plate 6, a pressure transmitter 7, a temperature transmitter 8, a ball valve 9, a drainage valve group 10, a ball valve 12, a pressure transmitter 13, a temperature transmitter 14, a forward second row pressure relief valve 15, a flow-limiting orifice plate 16, a pressure transmitter 17, a temperature transmitter 18, a ball valve 19, a drainage valve group 20, a ball valve 22, a pressure transmitter 23, a temperature transmitter 24, a reverse pressure relief valve 25, a flow-limiting orifice plate 26, a pressure transmitter 27, a temperature transmitter 28, a ball valve 29 and a drainage valve group 30.
The schematic diagram of the whole system pressure protection of the liquid ethane conveying pipeline is shown in fig. 2, and the forward pressure relief system and the reverse pressure relief system are arranged at different trunk pumps or valves (B, C, …, N) of the whole-line conveying pipeline to form a bypass passage after overpressure, the upstream is connected with an upstream storage tank A, and the downstream is connected with a downstream storage tank X.
Wherein:
the ball valve 2, the pressure transmitter 3, the temperature transmitter 4, the forward first-row pressure relief valve 5, the flow limiting orifice plate 6, the pressure transmitter 7, the temperature transmitter 8, the ball valve 9 and the liquid discharge valve group 10 form a forward first-row pressure relief system a which is responsible for relieving overpressure media of the upstream pipeline 100 to a downstream pipeline 102; the ball valve 12, the pressure transmitter 13, the temperature transmitter 14, the forward second row pressure relief valve 15, the restriction orifice 16, the pressure transmitter 17, the temperature transmitter 18, the ball valve 19 and the drain valve group 20 form a forward second row pressure relief system b, and are also responsible for relieving overpressure medium of the upstream pipeline 100 to the downstream pipeline 102. The effect of installing a restrictive orifice downstream of the bleed valve is to control the amount of bleed that continues after a blow-back failure of the bleed valve.
In particular, the amount of the solvent to be used,
1) when the main valve 101 is closed, transient water hammer pressure boosting or long-period pressure boosting caused by temperature rising after stopping transmission may occur in the upstream pipeline 100, transient water hammer pressure reducing may occur in the downstream pipeline 102, and overpressure medium is sent into the downstream pipeline 102 through the forward first-row pressure relief system a and the forward second-row pressure relief system b;
2) the positive first row pressure relief system a and the positive second row pressure relief system b can be selectively provided with pressure relief valves with the same specification and set pressure, and can also be provided with pressure relief valves with different specifications and set pressure, and the set pressure cannot be higher than the design pressure of a main pipeline;
3) the positive first row pressure relief system a and the positive second row pressure relief system b are on-line and act simultaneously, and the setting is not considered to be mutually standby;
4) when any one of the positive first row of pressure relief systems a and the positive second row of pressure relief systems b fails, the other row can meet the requirement of timely relief of overpressure media in terms of process;
5) the ball valves 2, 9, 12 and 19 are kept in a normally open state and are closed when pipe section instruments, valves and the like are replaced and maintained;
6) the forward pressure relief system a/b has flowing dead corners when the pipelines normally run, and after process evaluation confirms that the fluid standing at extremely low temperature has influence on the relief of the equipment, the pipelines can be subjected to temperature compensation by adopting an electric tracing and heat insulation system. In order to further reduce the electric load, a pipeline and a ball valve can be arranged between the liquid drainage interfaces 10a/10b and 20a/20b, the pipeline flow passage is unblocked by periodically opening and closing, and electric heat tracing is only carried out between the pressure relief valve and the flow limiting hole plate.
Wherein:
the ball valve 22, the pressure transmitter 23, the temperature transmitter 24, the reverse first-row pressure relief valve 25, the restriction orifice 26, the pressure transmitter 27, the temperature transmitter 28, the ball valve 29 and the drain valve group 30 form a reverse pressure relief system c, which is responsible for returning and relieving overpressure medium excessively relieved to the downstream pipeline 102 in the upstream pipeline 100 to the upstream pipeline 100 through the forward pressure relief system, and is also responsible for relieving the medium to the upstream pipeline 100 after the downstream pipeline 102 is cut off and the medium is heated to cause overpressure. And a flow-limiting orifice plate is arranged at the upstream of the relief valve to control the continuous relief quantity after the relief valve is subjected to recoil failure.
In particular, the amount of the solvent to be used,
1) when the main valve 101 is closed, transient water hammer pressure boosting may occur in the upstream pipeline 100, transient water hammer pressure reducing may occur in the downstream pipeline 102, overpressure medium is sent into the downstream pipeline 102 through the forward first-row pressure relief system a and the forward second-row pressure relief system b, if excessive relief occurs, the pressure of the downstream pipeline 102 is too high, the overpressure medium is sent into the upstream pipeline 100 through the reverse pressure relief system c, and in addition, after the downstream pipeline 102 is cut off, the overpressure medium can also be sent into the upstream pipeline 100 through the reverse pressure relief system c after the pressure is raised due to the fact that the medium stops being transported and heated;
2) the set pressure of a pressure relief valve in the reverse pressure relief system c can not be higher than the design pressure of a main pipeline;
3) the ball valves 22 and 29 are kept in a normally open state and are closed when pipe section instruments, valves and the like are replaced and maintained;
4) and the reverse pressure discharge system c has flowing dead corners when the pipelines normally run, and after the process evaluation confirms that the discharge of the equipment is influenced by the standing of the fluid at extremely low temperature, the pipelines can be subjected to temperature compensation by adopting an electric tracing and heat insulation system. In order to further reduce the electric load, a pipeline and a ball valve can be arranged between the liquid drainage interfaces 30a/30b, the pipeline flow passage is unblocked by periodically opening and closing, and electric heat tracing is only carried out between the pressure relief valve and the flow limiting hole plate.
In the forward and reverse pressure relief system, the relief valve and the subsequent pipelines, the flow-limiting orifice plate, the valve and the like are selected according to low-temperature materials.
Wherein,
and a forward pressure relief system a/b and a reverse pressure relief system c are continuously arranged at all the main valves of the whole-line conveying pipeline, and the relief set pressure of the forward pressure relief system a/b and the reverse pressure relief system c is not higher than the design pressure of the main pipeline. After all the main valves are closed, overpressure media at different positions can enter an upstream first-station pipeline or a downstream last-station pipeline through a pressure relief system by-passing the valves and finally enter a storage tank to achieve the purpose of pressure relief.
Specifically, after the pressure of each valve bypass pressure relief system exceeds a set value, a 'passage' can be formed, and an upstream storage tank and a downstream storage tank of a main pipeline system are used as final storage equipment for overpressure relief.
The invention also discloses a pressure protection method for the liquid ethane conveying pipeline, which comprises the following steps:
determining the highest allowable pressure and the maximum discharge amount which may occur in the operation of a pipeline system according to the position of each block valve in the pipeline system and a process simulation analysis result according to a pressure bypass discharge principle, and determining the set pressure and the discharge capacity of each forward pressure discharge valve and each reverse pressure discharge valve;
step two (a), water hammer is caused by closing of a valve 101 in the pipeline, the pressure at the end of the upstream pipeline 100 exceeds the set pressure of the positive pressure relief valve 5/15, the pressure of the downstream pipeline 102 is reduced due to medium flowing inertia, the positive pressure relief valve 5/15 is opened, overpressure medium enters the downstream pipeline 102 through the positive first-row pressure relief system a and the positive second-row pressure relief system b simultaneously, and when the pressure at the end of the upstream pipeline 100 is lower than the set pressure of the positive pressure relief valve 5/15, the pressure relief valve 5/15 is closed, and the operation is repeated;
step two (b), if the downstream pipeline 102 is opened along the line valve at the same time of the step two (a), the overpressure medium entering the downstream pipeline 102 flows to the tail point of the pipeline system; when the downstream pipeline 102 is also closed along the line valve, the starting pressure of the downstream pipeline 102 is possibly caused to be higher than the set pressure of the reverse pressure relief valve 25, the reverse pressure relief valve 25 is opened, overpressure medium enters the pipeline 100 through the reverse pressure relief system c, when the starting pressure of the downstream pipeline 102 is lower than the set pressure of the reverse pressure relief valve 25, the pressure relief valve 25 is closed, and the operation is repeated, so that the pressure relief of the pipeline system is finally realized;
step three (a), when the valve 101 is closed, and the end pressure of the medium in the upstream pipeline 100 exceeds the set pressure of the positive pressure relief valve 5/15 due to the stop of transportation and temperature rise, the positive pressure relief valve 5/15 is opened, the overpressure medium enters the downstream pipeline 102 through the positive first-row pressure relief system a and the positive second-row pressure relief system b at the same time, and when the end pressure of the pipeline 101 is lower than the set pressure of the positive pressure relief valve 5/15, the pressure relief valve 5/15 is closed, and the operation is repeated;
step three (b), when the downstream pipeline 102 is opened along the line valve at the same time of step three (a), the overpressure medium entering the downstream pipeline 102 flows to the end point of the pipeline system; when the downstream pipeline 102 is also closed along the line valve, which may cause the pressure at the beginning of the downstream pipeline 102 to be higher than the set pressure of the reverse pressure relief valve 25, the reverse pressure relief valve 25 is opened, the overpressure medium enters the upstream pipeline 100 through the reverse pressure relief system c, and when the pressure at the beginning of the downstream pipeline 102 is lower than the set pressure of the reverse pressure relief valve 25, the pressure relief valve 25 is closed, and the steps are repeated, so that the pressure relief of the pipeline system is finally realized;
step four (a), in step two, step three simultaneously, when the valve along the downstream line of the trunk line is closed, besides possibly causing the starting point of the downstream pipeline 102 to be higher than the set pressure of the reverse pressure relief valve 25, and the overpressure medium enters the pipeline 101 through the reverse pressure relief system c, the pressure at the tail end of the downstream pipeline 102 may also be caused to be higher than the set pressure of the next forward pressure relief valve, and the overpressure medium enters the subsequent trunk line through the next forward pressure relief system, and finally the overpressure relief of the pipeline system is realized.
Claims (10)
1. The utility model provides a liquid ethane pipeline pressure protection system which characterized in that: the system comprises a forward pressure relief system and a reverse pressure relief system which are arranged on a main pump or a valve bypass in parallel at each position, and overpressure medium storage tanks arranged at the upstream and the downstream of a pipeline system; the positive pressure relief system comprises a temperature sensor and a pressure sensor which are arranged on the main pipe pump or the valve bypass short section, and a ball valve, a positive pressure relief valve and a flow-limiting orifice plate which are connected with the main pipe pump or the valve bypass short section; the reverse pressure relief system comprises a temperature sensor and a pressure sensor which are arranged on the main pipe pump or the valve bypass short section, and a ball valve, a reverse pressure relief valve and a flow-limiting orifice plate which are connected with the main pipe pump or the valve bypass short section.
2. The liquid ethane transport pipeline pressure protection system of claim 1, wherein: the positive pressure relief systems are arranged in parallel.
3. The liquid ethane transport pipeline pressure protection system of claim 1, wherein: the positive pressure relief system comprises a first ball valve, a positive pressure relief valve, a restriction orifice plate and a second ball valve which are arranged from upstream to downstream in sequence.
4. The liquid ethane transport pipeline pressure protection system of claim 3, wherein: and a pressure sensor and a temperature sensor are sequentially arranged on the bypass short section between the first ball valve and the positive pressure relief valve.
5. The liquid ethane transport pipeline pressure protection system of claim 3, wherein: and a pressure sensor and a temperature sensor are sequentially arranged on the bypass short section between the flow-limiting orifice plate and the second ball valve.
6. The liquid ethane transport pipeline pressure protection system of claim 3, wherein: the reverse pressure relief system comprises a third ball valve, a reverse pressure relief valve, a restriction orifice plate and a fourth ball valve which are sequentially arranged from downstream to upstream.
7. The liquid ethane transport pipeline pressure protection system of claim 6, wherein: and a pressure sensor and a temperature sensor are sequentially arranged on the bypass short section between the third ball valve and the reverse pressure relief valve.
8. The liquid ethane transport pipeline pressure protection system of claim 6, wherein: and a pressure sensor and a temperature sensor are sequentially arranged on the bypass short section between the flow-limiting orifice plate and the fourth ball valve.
9. A pressure protection method for a liquid ethane conveying pipeline is characterized by comprising the following steps: the method comprises the following steps:
(1) a forward pressure relief system and a reverse pressure relief system are arranged on each main line pump or valve bypass in parallel, and the set pressure of each forward pressure relief valve and each reverse pressure relief valve is set according to the highest allowable pressure possibly occurring in the operation of the pipeline;
(2) when a valve at a certain position in the pipeline is closed to cause water hammer and the set pressure of the positive pressure relief valve at the position is exceeded, overpressure medium enters a downstream pipeline through the positive pressure relief valve at the position;
(3) when the pressure rises due to the fact that the temperature rises after the delivery is stopped at a certain position in the pipeline and the set pressure of the forward pressure relief valve or the reverse pressure relief valve is exceeded, overpressure medium enters a downstream pipeline or an upstream pipeline through the forward pressure relief valve or the reverse pressure relief valve at the position;
(4) when the downstream or upstream pipeline receiving the discharge medium is also closed by a valve and overpressure occurs at the same time, a forward pressure discharge valve or a reverse pressure discharge valve corresponding to the valve is opened, and the overpressure medium continues to enter the adjacent pipe section until finally entering an overpressure medium storage tank arranged upstream and downstream of the pipeline system.
10. The pressure protection method for the liquid ethane transport pipeline according to claim 9, wherein the pressure protection method comprises the following steps: when the fluid is kept still at an extremely low temperature to influence the discharge of a forward pressure discharge system or a reverse pressure discharge system, the electric tracing and heat preservation system is adopted to carry out temperature compensation on the pipeline.
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| CN201810203115.9A CN108317398B (en) | 2018-03-13 | 2018-03-13 | Pressure protection system and method for liquid ethane conveying pipeline |
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| CN201810203115.9A CN108317398B (en) | 2018-03-13 | 2018-03-13 | Pressure protection system and method for liquid ethane conveying pipeline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109357163A (en) * | 2018-11-23 | 2019-02-19 | 中国石油工程建设有限公司 | A kind of gaseous ethane pipeline shutdown restarts system and method |
| CN109506131A (en) * | 2018-12-17 | 2019-03-22 | 中国石油工程建设有限公司 | A kind of associated gas treatment plant slug flow trapping system and method |
| CN109915731A (en) * | 2019-04-02 | 2019-06-21 | 中国石油工程建设有限公司 | A kind of big drop lpg pipeline pressure protective system and method |
| CN111059471A (en) * | 2019-12-12 | 2020-04-24 | 中国石油工程建设有限公司 | Liquid ethane pipeline valve chamber relief system and method |
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