CN111059471B - Liquid ethane pipeline valve chamber relief system and method - Google Patents
Liquid ethane pipeline valve chamber relief system and method Download PDFInfo
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- CN111059471B CN111059471B CN201911272016.7A CN201911272016A CN111059471B CN 111059471 B CN111059471 B CN 111059471B CN 201911272016 A CN201911272016 A CN 201911272016A CN 111059471 B CN111059471 B CN 111059471B
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
Abstract
The invention discloses a relief system and a relief method for a liquid ethane pipeline valve chamber. Compared with the prior art, the invention has the following positive effects: according to the characteristic that the discharging process is easy to generate lower temperature in the pipeline body and the emptying system after the liquid ethane pipeline stops delivering, the planned emptying process of the ethane pipeline valve chamber is optimized by arranging the main line temperature detection system, the bypass extension branch pipe system, the movable emptying system and other measures according to the operation safety and the material selection economy, and the effects of safe and economic operation are achieved.
Description
Technical Field
The invention relates to a liquid ethane pipeline valve chamber relief system and a method.
Background
With the development of natural gas treatment technology and the development of natural gas efficient utilization technology, the ethane recovery capacity in natural gas is continuously improved, and long-distance transportation technology thereof is urgently needed to be vigorously developed. Ethane products, which are lighter in molar mass as a natural gas byproduct, have a higher saturated vapor pressure, a critical temperature of about 32 ℃ and a critical pressure of about 4.5MPa, and therefore are transported in a single phase in a gas phase or liquid phase under certain conditions. Compared with a gaseous ethane pipeline conveying mode, the liquid conveying mode has the remarkable characteristics of small pipe diameter and high conveying efficiency, and is suitable for large-scale and pipe network conveying of ethane products.
In order to ensure that the pipeline is convenient to maintain and overhaul in a segmented manner and reduce the release amount in the maintenance and inspection process, the valve chambers are required to be arranged on long-distance pipelines. At present, valve chamber arrangement processes of pipelines for long-distance natural gas, crude oil, product oil, LPG and the like are basically mature, the main functions are pipeline cutting and medium emptying (diffusing) or recycling, and materials of valve chamber stations and emptying systems are basically carbon steel. For liquid ethane, the liquid ethane has higher latent heat of vaporization and Joule-Thompson effect, after a liquid phase medium in a pipeline is quickly decompressed to atmospheric pressure, the downstream adiabatic relief temperature can reach-80 ℃, and the inside of the pipeline can possibly have a working condition lower than-40 ℃ due to decompression, so that the influence of medium phase change and decompression in the decompression process on the long-distance pipeline body and the emptying system material must be considered in the relief process of a valve chamber, and the safety of the system under the low-temperature working condition is ensured; meanwhile, the molar mass of the liquid ethane is about 30g/mol, the liquid ethane is slightly heavier than air, and after the liquid ethane is released to the atmosphere, the problems of large-range suspension, low-position accumulation and the like occur, and a proper emptying medium treatment mode must be considered.
Although the liquid ethane pipeline has huge prospect, the construction of the liquid ethane long-distance pipeline is not developed at home at present. Meanwhile, related research is mainly focused on the liquid ethane pipeline conveying process, and detailed valve chamber design and research progress are not reported yet.
Therefore, research and measures are actively needed to ensure the safety of emptying the liquid ethane pipeline valve chamber, and a set of feasible and economic solution is formed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a liquid ethane pipeline valve chamber relief system and a method, and aims to further promote the development of a liquid ethane pipeline conveying technology and guarantee the operation safety. The invention is based on the basic function requirements of the liquid ethane long-distance pipeline valve chamber setting, combines the medium phase state, pressure and temperature change rule of the liquid ethane in the valve chamber relief process, adopts the modes of high-pressure branch pipe extension, trunk temperature and pressure detection, low-temperature emptying system skid-mounting and the like, effectively controls the problems of trunk low temperature, emptying system low temperature and low temperature material investment and the like which are possibly caused by the emptying of the liquid ethane pipeline valve chamber, and realizes the safe and economic valve chamber relief of the liquid ethane pipeline.
The technical scheme adopted by the invention is as follows: a liquid ethane pipeline valve chamber vent system comprising a valve chamber trunk system, a valve chamber bypass system, a bypass extension leg system, a movable vent system and a trunk pipeline temperature detection system, wherein:
the valve chamber trunk line system comprises a valve chamber trunk line pipeline and a trunk line block valve arranged on the valve chamber trunk line pipeline, and the valve chamber trunk line pipeline is connected with an upstream buried trunk line and a downstream buried trunk line;
the valve chamber bypass system comprises an upstream bypass pipeline and a downstream bypass pipeline which form a closed loop, and a pressure transmitter, a temperature transmitter and a bypass block valve which are respectively arranged on the upstream bypass pipeline and the downstream bypass pipeline;
the bypass extension branch pipe system comprises a bypass branch pipe, a branch pipe block valve and a branch pipe flange, wherein the branch pipe block valve and the branch pipe flange are arranged on the bypass branch pipe;
the movable emptying system comprises an emptying pipeline, and a high-pressure hose, an emptying regulating valve, a reducer and an emptying torch which are sequentially arranged on the emptying pipeline, wherein a butt flange is arranged at the front end of the high-pressure hose;
the main pipeline temperature detection system comprises a distributed temperature measurement optical fiber system arranged along the main pipeline and a temperature measurement system arranged in the valve chamber.
The invention also provides a relief method for the liquid ethane pipeline valve chamber, which comprises the following steps:
step one, arranging a plurality of block valve chambers and temperature and pressure detecting instruments along a liquid ethane conveying pipeline, and arranging a distributed temperature measuring optical fiber system along a trunk line; movable emptying systems are stored in fixed areas along the pipeline, and each set of movable emptying system is used for emptying the peripheral 3-5 seat valve chambers;
step two, when the pipeline normally runs, keeping a valve chamber trunk line block valve open, keeping a valve chamber bypass block valve and a buried bypass branch pipe block valve closed, and blindly plugging a branch pipe flange;
step three, closing the trunk line block valves at two ends of the trunk line pipe section corresponding to the required emptying before the pipeline needs to be shut down; closing the whole pipeline upstream and downstream production systems;
opening a replacement block valve at the starting end of the bypass branch pipe, a buried bypass branch pipe block valve and a branch pipe replacement valve, and introducing nitrogen to replace a bypass and prolong a branch pipe system, wherein the replacement time is at least 10 min; after replacement is finished, the blind flange of the branch pipe flange is removed, the blind flange is connected with a butt flange of the movable emptying system, and the bypass branch pipe extension system and the movable emptying system are opened; opening a vent regulating valve, introducing nitrogen from the replacement block valve at the starting end of the bypass branch pipe again, closing the branch pipe replacement valve, discharging the nitrogen from the upper part of the vent torch, and replacing for at least 5 min; closing the branch pipe block valve and the emptying regulating valve, injecting nitrogen into the bypass branch pipe through a replacement block valve at the starting end of the bypass branch pipe, and lifting the bypass branch pipe block valve until the pipeline pressure between the emptying regulating valve is equal to the trunk line pressure; closing the replacement block valve at the starting end of the bypass branch pipe;
opening a trunk line bypass block valve at one side of a required discharge pipe section, then opening a buried bypass branch pipe block valve, slowly opening a vent regulating valve, pushing nitrogen injected in advance by a medium in a trunk line to enter a vent system, and continuously operating an automatic ignition system until a vent torch burns; continuously recording and monitoring temperature and pressure parameters of all parts of the required emptying pipe section, and recording and monitoring parameters of the distributed temperature measurement optical fiber system; controlling the opening degree of an emptying regulating valve and keeping the temperature of a main line higher than-20 ℃;
and step six, when the monitoring value of the main line pressure is close to the normal pressure, injecting nitrogen from a valve chamber bypass of an upstream pipe section, carrying out integral replacement of a venting pipe section, and finishing the operation.
Compared with the prior art, the invention has the following positive effects:
according to the characteristic that the discharging process is easy to generate lower temperature in the pipeline body and the emptying system after the liquid ethane pipeline stops delivering, the planned emptying process of the ethane pipeline valve chamber is optimized by arranging the main line temperature detection system, the bypass extension branch pipe system, the movable emptying system and other measures according to the operation safety and the material selection economy, and the effects of safe and economic operation are achieved. The concrete expression is as follows:
(1) science of setup
According to the emptying characteristics of the liquid ethane pipeline valve chamber, the system is provided with a main line temperature and pressure detection system for the upstream pipeline to realize the main line pipeline protection in the emptying process aiming at the problem that the valve chamber emptying is easy to cause low temperature of the upstream main line pipeline and the downstream emptying system; compared with a mode that all the valve chambers are provided with fixed emptying systems, the movable emptying system made of stainless steel is arranged, so that the total engineering investment is reduced, and the requirement of planned emptying of all the valve chambers is met; the high-pressure extension bypass branch pipe is arranged, so that the pipeline length of the emptying system is further reduced, and the field installation work of the movable emptying system is greatly reduced.
(2) Is economical and reasonable
The system is installed after the pipeline is stopped from conveying and needs emptying, replaces the traditional mode that each valve chamber is pre-configured with a fixed emptying system, effectively controls the engineering investment on the basis of ensuring the system functionality, and has good economy.
(3) Promote the development of technology
In view of the fact that the liquid ethane pipeline is still in a starting stage in the development of China, the invention provides related guarantee measures on the basis of fully researching the planned emptying technology of the liquid ethane pipeline valve chamber, can provide support and reference for the technical development of the liquid ethane conveying pipeline in China, and is beneficial to promoting the further development of the technology.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of a liquid ethane piping valve chamber relief system of the present invention.
Detailed Description
A liquid ethane pipeline valve chamber vent system, as shown in fig. 1, consisting essentially of: the system comprises an upstream buried trunk line 1, a trunk line block valve 2, a downstream buried trunk line 3, a pressure transmitter 4/6, a temperature transmitter 5/7, a bypass block valve 8/9, a bypass replacement valve 10/11, an upstream bypass pipeline 12, a downstream bypass pipeline 13, a bypass extension branch pipe 14, a branch pipe block valve 15, a branch pipe replacement valve 16, a branch pipe flange 17, a docking flange 18, a high-pressure hose 19, a vent regulating valve 20, a reducer 21, a vent pipeline 23, a flame arrester 24 and a vent torch 25.
The valve chamber trunk line system is composed of an upstream buried trunk line 1, a trunk line block valve 2 and a downstream buried trunk line 3 and is responsible for connecting an upper pipeline and a lower pipeline to form a liquid ethane conveying channel; the trunk line cut-off valve 2 is responsible for pipeline communication or cut-off.
Specifically, the upstream buried trunk line 1 and the downstream buried trunk line 3 are both provided with parallel optical fiber temperature measuring systems for on-way temperature detection during normal operation and temperature detection during trunk line emptying. The trunk line block valve 2 is an electric control full-diameter ball valve, is normally open, and is closed when the upstream buried trunk line 1 or the downstream buried trunk line 2 needs to be overhauled.
The pressure transmitter 4/6, the temperature transmitter 5/7, the bypass cutoff valve 8/9, the bypass replacement valve 10/11, the upstream bypass pipeline 12, the downstream bypass pipeline 13 and the like form a valve chamber bypass system, which is used for performing bleed-off control and bleed-off pipe section selection after the main pipeline is stopped, and also provides fixed-point temperature and pressure detection for the main pipeline emptying process.
Specifically, the upstream bypass pipeline 12 and the downstream bypass pipeline 13 form a closed loop, the materials of the upstream bypass pipeline and the downstream bypass pipeline are all carbon steel, the upstream bypass pipeline and the downstream bypass pipeline are installed in an exposed mode, and the upstream bypass pipeline and the downstream bypass pipeline are respectively connected with a valve chamber main pipeline upstream and downstream of a main line block valve and are used for selecting a discharge pipe section after the main pipeline is stopped and establishing valve opening back pressure when the main pipeline is put into production again; the pressure transmitter 4/6 has pressure detection and uploading capability and is installed in close proximity to the upstream/downstream main line pipes for monitoring pressure during pipe operation, shut-down, and relief conditions. The temperature transmitter 5/7 has temperature detection and uploading functions, is arranged close to the upstream/downstream main pipeline and is used for monitoring the temperature of the pipeline under the working conditions of operation, stop transmission, discharge and the like; the bypass block valve 8/9 is a manual ball valve made of carbon steel and is normally closed, and is respectively installed on the upstream and downstream bypass pipelines and respectively close to the bypass pipeline and the upstream trunk line of the trunk block valve and the downstream trunk line of the trunk block valve, so as to play the roles of controlling the opening and closing of the bypass and selecting a discharge pipe section after the pipeline stops transmission; bypass override valve 10/11 is a manual ball valve, made of carbon steel, normally closed, connected to upstream bypass line 12 and downstream bypass line 13 by pup joint tubing, and immediately downstream of bypass block valve 8/9.
Wherein, bypass extension branch pipe 14, branch pipe block valve 15, branch pipe replacement valve 16, branch pipe flange 17 etc. constitute bypass extension branch pipe system for the medium bleeder channel is pressed in the main line area of providing and extension, make the pressure release point keep away from the main line on the one hand, avoid the low temperature that the pressure release medium arouses to influence the upper reaches main line, on the other hand is satisfying under the prerequisite of evacuation torch and valve chamber interval, reduce the quantity of unloading low pressure stainless steel pipeline, in addition, still be convenient for implement the skid-mounted ization of unloading system, avoid on-the-spot long distance pipe connection.
Specifically, the bypass extension branch pipe 14 is the same as the upstream bypass pipeline 12 and the downstream bypass pipeline 13 in design pressure, pipe diameter and material, is buried underground, has the distance between the starting point and the tail point not less than 50m, meets the requirement that a valve chamber operator is in the safety range of ignition heat radiation of the movable emptying system, is connected with the valve chamber bypass pipeline upstream of the bypass extension branch pipe 14, is reserved and connected with the downstream of the valve chamber bypass pipeline, is used for providing and extending a trunk medium pressure relief channel, on one hand, enables the pressure relief point to be far away from the trunk line, avoids the influence of low temperature caused by the pressure relief medium on the upstream trunk line, on the other hand, reduces the using amount of the emptying low-pressure stainless steel pipeline on the premise of meeting the distance between an emptying torch and the valve chamber, and is convenient to implement the skid-. The branch pipe block valve 15 is installed at the tail section of the downstream of a buried bypass branch pipe and used for daily plugging, a double block system is formed by matching with the bypass block valve and is a ball valve, manually controlled and normally closed, and the double block system is opened when a valve chamber is released. The branch pipe replacement valve 16 is a manual ball valve made of carbon steel and is normally closed, is connected to the tail end of the bypass extension branch pipe 14 through a short pipe joint, and is used for injecting high-pressure nitrogen when the buried bypass branch pipe is put into use and performing combustible gas replacement after the operation is stopped. The branch pipe flanges 17 are made of carbon steel and are connected through blind flanges daily to plug the bypass extension branch pipes 14 and butt joint flanges 18 of the movable emptying system before emptying.
Wherein, the docking flange 18, the high-pressure hose 19, the blow-down regulating valve 20, the reducer 21, the blow-down pipeline 23, the flame arrester 24 and the blow-down torch 25 form a movable blow-down system, form a skid-mounted module, can be transported by a conventional truck on the road, are transported and connected in a planned blow-down mode in a main valve chamber, and carry out safe treatment on the blow-down ethane.
Specifically, the butt flange 18 is made of stainless steel, has the same pressure grade as the bypass extension branch 14, and is used for connecting the branch flange 17 at the tail end of the bypass extension branch system; the high-pressure hose 19 is a low-temperature-resistant flexible pipeline with the pressure grade not lower than that of the bypass extension branch pipe 14, provides compensation for the connection of the butt flange 18 and the branch pipe flange 17, is connected with the butt flange and the downstream regulating valve, is provided with a heating system, is used for reducing the upstream transmission of cold energy caused by the pressure reduction of the regulating valve, and is also convenient for the butt joint of the movable emptying system and an upstream fixed pipeline; the emptying adjusting valve 20 is an electric adjusting valve made of stainless steel, and the opening degree of the emptying adjusting valve is controlled by the temperature measuring result of the temperature transmitter and the pipeline on-way temperature measuring system, so that the effect of controlling the emptying amount is achieved; the reducer 21 and the emptying pipeline 23 which are arranged at the downstream of the emptying regulating valve are made of stainless steel materials; the emptying pipeline is provided with a flame arrester for preventing backfire, and the flame arrester 24 is made of stainless steel and is arranged at the tail end of the emptying pipeline 23; the flare 25 is disposed at the end of the system, is made of stainless steel, has an automatic ignition system, and is used for burning the released gaseous ethane.
In addition, a distributed temperature measuring optical fiber system arranged along the main pipeline and a temperature transmitter arranged in the valve chamber form a main temperature detection system which is used for continuously monitoring the on-way temperature of the pipeline in normal operation, identifying the leakage point of the pipeline, simultaneously detecting the temperature change caused by medium phase change and throttling effect due to main decompression in the relief process in real time, connecting a lock and a relief regulating valve in parallel and controlling the relief speed.
Meanwhile, the system also comprises a logic control system for realizing signal transmission, processing and valve control of the transmitter.
The working principle and the working process of the invention are as follows:
(1) when the liquid ethane pipeline is normally transported, the movable emptying system is placed in a reserved site of a trunk valve chamber with 3-5 seats for radiation, the trunk block valve 2 is kept open, and the valve chamber bypass system is kept closed.
(2) Before the main pipeline needs emptying, the main cut-off valve 2 plays a role of cutting off the emptying unit; different from the conventional valve chamber provided with a fixed emptying system, the invention only can adopt the emptying system made of stainless steel materials in consideration of the extremely low temperature after the pressure relief of the liquid ethane, so that the invention provides the movable emptying system which is prized and can serve a plurality of valve chambers, and the movable emptying system is transported to the valve chamber needing to be drained through a vehicle, and is butted and debugged with the bypass extension branch pipe system. The invention arranges the replacement valve on the bypass extension system, and aims to charge nitrogen with the same pressure as the upstream main line into the bypass extension system after the movable emptying system is in butt joint with the bypass extension system, so that the pressure relief temperature drop in the bypass extension branch pipe system is avoided after the bypass cut-off valve 8 or 9 is opened, and the emptying system is replaced again by using the nitrogen in the pipeline to form front-end gas in the emptying process, so that ethane emptying gas is prevented from being combusted in the emptying pipeline.
(3) In the process of emptying the main line, two temperature reduction processes of phase change temperature reduction and pressure relief temperature reduction occur after the pressure of the liquid ethane is relieved, and the temperature of the downstream of an emptying regulating valve is lower than-80 ℃, so that a stainless steel material is selected as a discharge system; meanwhile, the temperature of the trunk line and the valve chamber pipeline at the upstream of the air release regulating valve is also influenced by the pressure release of the reserved medium, the release speed needs to be strictly controlled, and the parameters of the temperature detection system are monitored in real time, so that time is provided for the medium in the pipeline to fully exchange heat with the ambient environment, the temperature of the pipeline is prevented from being lower than the allowable operating temperature of the pipeline material, and the safety of the carbon steel material of the trunk line and the valve chamber system is ensured. Different from a conventional valve chamber, the valve chamber of the liquid ethane pipeline is provided with a bypass branch pipe system with a longer distance, the purpose of the invention is mainly to provide and prolong a main line medium-under-pressure relief channel, on one hand, a pressure relief point is far away from the main line, and the influence of low temperature caused by the pressure relief medium on an upstream main line is avoided, on the other hand, the using amount of a venting low-pressure stainless steel pipeline is reduced on the premise of meeting the distance between a venting torch and the valve chamber, and in addition, the implementation of skid mounting of the venting system is facilitated, and the long-distance pipeline connection.
The invention also discloses a relief method for the liquid ethane pipeline valve chamber, which comprises the following main contents:
the method comprises the following steps: arranging a plurality of block valve chambers and temperature and pressure detecting instruments along the liquid ethane conveying pipeline; a distributed temperature measuring optical fiber system is arranged along the trunk line. The movable emptying systems (typically skid-mounted) are stored in fixed areas along the pipeline, and each set of movable emptying system can be flexibly responsible for emptying the 3-5 seat valve chambers on the periphery.
Step two: when the pipeline normally runs, the valve chamber trunk line block valve 2 is kept open, the valve chamber bypass block valve 7/8 and the buried bypass extension branch pipe block valve 15 are kept closed, and the branch pipe flange 17 is blindly plugged. Meanwhile, the movable emptying system is not connected into the valve chamber system.
Step three: before the pipeline needs to be stopped, the trunk line cut-off valves (in the example, the trunk line cut-off valve 2) at two ends of the trunk line pipe section corresponding to the required emptying are closed; and closing the pipeline all-line upstream and downstream production systems. The movable flare system is transported to the valve chamber at one end of the desired flare section ready for connection to the bypass extension leg system of that valve chamber.
Step four: opening replacement block valves 10 and 11 at the starting end of a bypass extension branch pipe 14, opening a buried bypass branch pipe block valve 15, opening a branch pipe replacement valve 16, introducing nitrogen to replace a bypass extension branch pipe system, wherein the replacement time is at least 10 min; after the replacement is finished, the blind flange of the branch pipe flange 17 is removed, the connecting flange 18 of the movable emptying system is connected, and the bypass branch pipe extension system and the movable emptying system are opened. Opening the pressure release valve 20, introducing nitrogen again from the displacement block valves 10 and 11, closing the branch pipe displacement valve 16, discharging the nitrogen from the upper part of the emptying torch 25, and allowing the displacement time to be at least 5 min; closing the branch shut-off valve 15 and the pressure relief valve 20, injecting nitrogen into the bypass extension branch pipe through the replacement shut-off valves 10 and 11, and increasing the pressure of a pipeline (the pipeline between the bypass shut-off valve and the movable emptying system regulating valve) to be equal to the main line pressure; the replacement block valves 10 and 11 are closed.
Step five: the trunk bypass block valve 8 (the side of the pipe section to be discharged) is opened, then the buried bypass branch pipe block valve 15 is opened, the discharge regulating valve 20 is slowly opened, the medium in the trunk enters the emptying system by pushing the nitrogen injected in advance, and the automatic ignition system continuously works until the emptying torch burns. And continuously recording and monitoring temperature and pressure parameters of all parts of the required emptying pipe section, and recording and monitoring parameters of the distributed temperature measurement optical fiber system. Controlling the opening degree of an emptying regulating valve and keeping the main line temperature monitoring parameter higher than-20 ℃; when the temperature is lower than minus 20 ℃, immediately reducing the opening degree of the emptying adjusting valve; when the temperature is lower than minus 25 ℃, the emptying adjusting valve is immediately closed so as to prevent the trunk pipeline and the buried bypass branch pipe from working conditions with pressure and low temperature.
Step six: and when the main line pressure monitoring value is close to the normal pressure, injecting nitrogen from a valve chamber bypass of the upstream pipe section, carrying out integral replacement of the emptying pipe section, and finishing the operation.
Through the steps, the system is operated, and the purpose of safely releasing the liquid ethane pipeline valve chamber is achieved.
Claims (2)
1. A method for relieving a liquid ethane pipeline valve chamber is characterized by comprising the following steps: the method comprises the following steps:
step one, arranging a plurality of block valve chambers and temperature and pressure detecting instruments along a liquid ethane conveying pipeline, and arranging a distributed temperature measuring optical fiber system along a trunk line; movable emptying systems are stored in fixed areas along the pipeline, and each set of movable emptying system is used for emptying the peripheral 3-5 seat valve chambers;
step two, when the pipeline normally runs, keeping a valve chamber trunk line block valve open, keeping a valve chamber bypass block valve and a buried bypass branch pipe block valve closed, and blindly plugging a branch pipe flange;
step three, closing the trunk line block valves at two ends of the trunk line pipe section corresponding to the required emptying before the pipeline needs to be shut down; closing the whole pipeline upstream and downstream production systems;
opening a replacement block valve at the starting end of the bypass branch pipe, a buried bypass branch pipe block valve and a branch pipe replacement valve, and introducing nitrogen to replace a bypass and prolong a branch pipe system, wherein the replacement time is at least 10 min; after replacement is finished, the blind flange of the branch pipe flange is removed, the blind flange is connected with a butt flange of the movable emptying system, and the bypass branch pipe extension system and the movable emptying system are opened; opening a vent regulating valve, introducing nitrogen from the replacement block valve at the starting end of the bypass branch pipe again, closing the branch pipe replacement valve, discharging the nitrogen from the upper part of the vent torch, and replacing for at least 5 min; closing the branch pipe block valve and the emptying regulating valve, injecting nitrogen into the bypass branch pipe through a replacement block valve at the starting end of the bypass branch pipe, and lifting the bypass branch pipe block valve until the pipeline pressure between the emptying regulating valve is equal to the trunk line pressure; closing the replacement block valve at the starting end of the bypass branch pipe;
opening a trunk line bypass block valve at one side of a required discharge pipe section, then opening a buried bypass branch pipe block valve, slowly opening a vent regulating valve, pushing nitrogen injected in advance by a medium in a trunk line to enter a vent system, and continuously operating an automatic ignition system until a vent torch burns; continuously recording and monitoring temperature and pressure parameters of all parts of the required emptying pipe section, and recording and monitoring parameters of the distributed temperature measurement optical fiber system; controlling the opening degree of an emptying regulating valve and keeping the temperature of a main line higher than-20 ℃;
and step six, when the monitoring value of the main line pressure is close to the normal pressure, injecting nitrogen from a valve chamber bypass of an upstream pipe section, carrying out integral replacement of a venting pipe section, and finishing the operation.
2. The method of venting a liquid ethane pipeline valve chamber of claim 1, wherein: when the temperature of the trunk line is lower than-20 ℃, immediately reducing the opening of the emptying regulating valve; when the temperature of the trunk line is lower than-25 ℃, the air release regulating valve is immediately closed.
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| CN110375207A (en) * | 2019-07-09 | 2019-10-25 | 安徽理工大学 | A kind of buried fuel gas pipeline leakage artificial intelligence detection system |
| CN110513600A (en) * | 2019-09-06 | 2019-11-29 | 中国石油工程建设有限公司 | A kind of gaseous ethane pipe end flow assurance system and method |
| CN211344795U (en) * | 2019-12-12 | 2020-08-25 | 中国石油工程建设有限公司 | Liquid ethane pipeline valve chamber relief system |
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