CN117307968A - System and method for branch supercritical carbon dioxide pipeline production - Google Patents
System and method for branch supercritical carbon dioxide pipeline production Download PDFInfo
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- CN117307968A CN117307968A CN202210723540.7A CN202210723540A CN117307968A CN 117307968 A CN117307968 A CN 117307968A CN 202210723540 A CN202210723540 A CN 202210723540A CN 117307968 A CN117307968 A CN 117307968A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 229
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 131
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 113
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 129
- 238000011049 filling Methods 0.000 claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000002609 medium Substances 0.000 claims description 75
- 230000033228 biological regulation Effects 0.000 claims description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000005429 filling process Methods 0.000 claims description 4
- 239000013587 production medium Substances 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims 3
- 241001330002 Bambuseae Species 0.000 claims 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 3
- 239000011425 bamboo Substances 0.000 claims 3
- 238000004140 cleaning Methods 0.000 description 46
- 229910000975 Carbon steel Inorganic materials 0.000 description 18
- 239000010962 carbon steel Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 235000011089 carbon dioxide Nutrition 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009919 sequestration Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229940026110 carbon dioxide / nitrogen Drugs 0.000 description 1
- 230000035425 carbon utilization Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007430 reference method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- 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
-
- 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
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a branch supercritical carbon dioxide pipeline production system and a branch supercritical carbon dioxide pipeline production method, wherein the system comprises a trunk medium introducing system, a production and discharge control system, a tail end discharge system and an instrument detection system, the trunk medium introducing system is connected with an upstream supercritical carbon dioxide trunk pipeline, and the trunk medium introducing system is provided with a branch production process pressure regulating bypass; the production and release control system is connected with a pressure regulating bypass of the trunk medium introducing system, the tail end release system is arranged at a tail end station yard of the branch line, and the instrument detection system comprises a plurality of pressure transmitters and temperature transmitters. Aiming at the problems of medium flow control, temperature control, pressure filling and the like before branch supercritical carbon dioxide pipeline delivery and delivery, the invention realizes safe and efficient replacement and pressure filling of the branch pipeline under the condition of providing stable load of the trunk line from the angles of stable trunk line flow, safe replacement, step pressure filling and the like.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide pipeline transportation, and particularly relates to a branch supercritical carbon dioxide pipeline production system and method.
Background
In order to meet the development demands of carbon peak and carbon neutralization strategies in China, the method for implementing large-scale capturing and utilizing of carbon dioxide is a preferred way for effectively reducing carbon emission under the background that the demands of energy conservation, emission reduction and environmental protection in the energy and chemical industry are gradually increased day by day. Among them, long distance pipeline transportation is a key way to support carbon dioxide capture and utilization. The critical temperature of the carbon dioxide is about 31.1 ℃, the critical pressure is about 7.38MPa, and when long-distance pipeline conveying is carried out, a supercritical conveying phase mode with the pressure higher than the critical pressure is adopted, so that the conveying economy is improved. Similar to the conventional pipeline system, along with the development of carbon capture, carbon sequestration or carbon utilization technologies, the construction trend of supercritical carbon dioxide pipelines is inevitably developed to a pipe network mode of a main pipeline and a branch pipeline, so that a perfect comprehensive network system is formed, and the utilization or sequestration efficiency of carbon sources is improved.
From the characteristics of carbon dioxide, the carbon dioxide has the characteristic of solid state at low temperature, and the triple point of pure carbon dioxide is-56.6 ℃ and 0.518MPa, which is the remarkable characteristic of carbon dioxide different from the conventional hydrocarbon medium. For a conventional liquid-phase pipeline, water is commonly used as an initial filling medium for pipeline production in the production process, and the conventional liquid-phase pipeline is replaced by oil top water in the pipeline operation. Unlike conventional liquid phase pipelines, dense phase transported carbon dioxide is highly corrosive in aqueous environments, and the pipeline itself has high drying requirements, so water is not desirable to establish pipeline backpressure prior to delivery. Meanwhile, because the supercritical carbon dioxide pipeline has higher requirements on pipeline drying, nitrogen or dry air is preferably dried in advance, and then the production operation is carried out. It should be noted that for a spur long distance pipeline downloading product from a supercritical carbon dioxide trunk pipeline, the production process should be sufficiently compliant with the trunk transportation plan, i.e. the spur pipeline production process has significant characteristics of relatively rated download capacity, which would otherwise greatly affect the stability of the trunk long distance transportation.
Meanwhile, under the low temperature condition (-20 ℃) of the service of the carbon steel pipeline, the pressure of the carbon dioxide forming the liquid phase is about 2MPa, which means that the carbon dioxide is in a gas phase or in a gas-liquid phase when the pressure is lower than the pressure or the temperature is lower than the pressure. Therefore, the problems of back pressure establishment, back pressure control and temperature control should be fully considered in the production process.
At present, few publications report on the production process of branch supercritical carbon dioxide pipelines with stable control of trunk flow, long-distance carbon dioxide pipelines in China are not virtually built, and related reference methods and experiences are very few, so that researches and optimization on related flow control before production, low-temperature control and filling processes are required, the safety of a pipeline system is ensured, and references are provided for the subsequent large-scale development of carbon dioxide pipeline conveying engineering.
Disclosure of Invention
The invention aims at: aiming at the problems, the branch supercritical carbon dioxide pipeline production system and the method can safely and efficiently implement branch supercritical carbon dioxide pipeline transportation.
Based on the carbon dioxide phase characteristics and objective constraint and demand of branch pipeline production, the invention aims at the problems of medium flow control, temperature control, pressure filling and the like before branch supercritical carbon dioxide pipeline transportation production, and respectively sets a main line medium introducing system, a production and release control system, a terminal release system, an instrument detection system and the like from the viewpoints of main line flow stabilization, safe replacement, step pressure filling and the like.
The main line medium introducing system is arranged at the branch line head station and mainly comprises a introducing branch line, a matched valve, a pipe cleaning ball barrel and the like, and is used for introducing main line medium into the branch line system, providing a pressure regulating bypass in the branch line production process, providing a medium discharging facility in an emergency in the branch line production process and the like; the production and discharge control system is arranged at a branch line head station and mainly comprises a flow regulating valve, a pressure regulating valve, a two-stage multi-row air-bath heat exchanger, a stainless steel pipeline and the like, and is used for controlling the flow and regulating the pressure of production medium downloaded by a trunk line, and meanwhile, temperature compensation is carried out on the low-temperature medium at the initial stage after pressure regulation, so that the minimum temperature requirement of filling into a downstream branch line is met, and in addition, the flow of different production stages is respectively controlled; the tail end discharge system is arranged at the tail end of the branch pipeline and is used for evacuating nitrogen stored in the pipeline in the initial production process, monitoring the gas components at the tail end of the pipeline for a long time, indicating the replacement condition and determining the starting time point of pressurization; the instrument detection system comprises a pressure transmitter, a temperature transmitter and the like which are arranged in each system of the invention and are used for monitoring the temperature and the pressure of key points in the production process and feeding back to the production system. Therefore, the high-efficiency and safe production of the branch supercritical carbon dioxide pipeline is realized.
The technical scheme adopted by the invention is as follows: a branch supercritical carbon dioxide pipeline production system is characterized in that: the system comprises a trunk medium introducing system, a production and discharge control system, a tail end discharge system and an instrument detection system;
the trunk medium introducing system is connected with an upstream supercritical carbon dioxide trunk pipeline and is used for introducing trunk medium into a branch line system, and the trunk medium introducing system is provided with a branch line production process pressure regulating bypass;
the production and release control system is connected with a pressure regulating bypass of the trunk line medium introducing system and is used for controlling flow and regulating pressure of the production medium downloaded by the trunk line, compensating temperature of the low-temperature medium at the initial stage after pressure regulation, and emptying the medium downloaded by the trunk line under an emergency working condition;
the tail end discharge system is arranged at a branch end station yard and is used for evacuating nitrogen stored in a pipeline in the initial production process and monitoring the gas components at the tail end of the pipeline;
the instrument detection system comprises a plurality of pressure transmitters and temperature transmitters and is used for monitoring the temperature and the pressure of key points in the production process.
The invention relates to a branch supercritical carbon dioxide pipeline production system, wherein the main line medium introducing system comprises a carbon dioxide branch access pipeline, a branch first bypass and a branch second bypass;
the carbon dioxide branch line access pipeline is connected with an upstream supercritical carbon dioxide trunk pipeline, and a branch line inlet cut-off valve, a branch line regulating valve and a branch line second cut-off valve are sequentially arranged on the carbon dioxide branch line access pipeline along the medium flow direction;
the branch first bypass is arranged at the downstream of the branch inlet cut-off valve and used for providing an inlet channel for connecting the production and discharge control system, and the branch first bypass is provided with the branch first bypass cut-off valve;
the branch line second bypass is arranged at the downstream of the branch line second cut-off valve and used for providing an outlet channel for connecting the production and release control system, and the branch line second bypass is provided with the branch line second bypass cut-off valve.
The invention relates to a branch supercritical carbon dioxide pipeline production system, which is characterized in that a branch inlet flow transmitter is arranged at the downstream of a branch inlet cut-off valve and used for detecting the carbon dioxide flow introduced by a branch in real time; and a branch line pressure transmitter is arranged at the downstream of the branch line second cut-off valve and used for detecting the pressure after the regulation of the branch line pressure in real time.
The invention discloses a branch supercritical carbon dioxide pipeline production system, which is characterized in that a pipe cleaning component is arranged at the downstream of a second cut-off valve of a branch, the pipe cleaning component comprises a pipe cleaning ball barrel, a pipe cleaning first cut-off valve, a branch pipe cleaning cut-off valve and a pipe cleaning second cut-off valve, the pipe cleaning first cut-off valve is connected with the large end of the pipe cleaning ball barrel, the branch pipe cleaning cut-off valve is connected with the outlet end of the pipe cleaning ball barrel, the pipe cleaning first cut-off valve and the pipe cleaning second cut-off valve are only opened under the conditions of branch head station replacement and pipe cleaning, the pipe cleaning device is closed immediately after being sent out, the pipe cleaning first cut-off valve is closed only under the conditions of branch head station replacement and pipe cleaning, and the pipe cleaning device is opened immediately after being sent out.
The invention discloses a branch supercritical carbon dioxide pipeline production system, which comprises a first-stage regulating valve rear pipeline, a second-stage regulating valve rear pipeline and a emptying assembly, wherein the first-stage regulating valve rear pipeline is connected with a branch first bypass cut-off valve through a first-stage regulating valve, the second-stage regulating valve rear pipeline is connected with a branch second bypass cut-off valve, and a first-stage air bath type heat exchanger, a second-stage regulating valve, a filter and a second-stage air bath type heat exchanger are sequentially arranged between the first-stage regulating valve rear pipeline and the second-stage regulating valve rear pipeline along the medium flowing direction, and the emptying assembly is connected to the downstream of the second-stage regulating valve.
The invention relates to a branch supercritical carbon dioxide pipeline production system, wherein an emptying assembly comprises an emptying pipeline and an emptying vertical pipe, the emptying pipeline is connected with a secondary regulating valve and the emptying vertical pipe, and the emptying pipeline is provided with an emptying flow regulating valve.
The invention discloses a branch supercritical carbon dioxide pipeline production system, which comprises a tail end discharge system, a branch pipeline and a branch pipeline, wherein the tail end discharge system comprises a discharge branch pipeline and a discharge vertical pipe, and a discharge cut-off valve, a discharge regulating valve and a sampling valve are sequentially arranged on the discharge branch pipeline.
The invention discloses a branch supercritical carbon dioxide pipeline production system, which comprises a first-stage pressure-regulating pressure transmitter, a first-stage pressure-regulating temperature transmitter, a first-stage heat-exchanging temperature transmitter, a second-stage pressure-regulating pressure transmitter, a second-stage pressure-regulating temperature transmitter and a second-stage heat-exchanging temperature transmitter, wherein the first-stage pressure-regulating pressure transmitter and the first-stage pressure-regulating temperature transmitter are arranged at the downstream of a first-stage regulating valve, the first-stage heat-exchanging temperature transmitter is arranged at the downstream of a first-stage air-bath heat exchanger, the second-stage pressure-regulating pressure transmitter and the second-stage pressure-regulating temperature transmitter are arranged at the downstream of a filter, and the second-stage heat-exchanging temperature transmitter is arranged at the downstream of the second-stage air-bath heat exchanger.
A production method of a production system adopting branch supercritical carbon dioxide pipelines is characterized in that: the method specifically comprises the following steps:
step one: before branch supercritical carbon dioxide pipeline delivery, keeping the trunk pipeline normally delivering, keeping the branch inlet cut-off valve closed, and keeping the branch regulating valve and the branch second cut-off valve closed;
step two: introducing supercritical carbon dioxide from a trunk line to replace nitrogen pre-filled before production in a branch line, wherein the nitrogen pre-filled before production in the branch line is specifically: injecting pressurized carbon dioxide into the downstream of the branch inlet cut-off valve to build back pressure, opening the branch inlet cut-off valve, connecting an upstream trunk line with the branch inlet section, sequentially opening a first bypass cut-off valve, a first-stage regulating valve, a second-stage regulating valve and a branch second bypass cut-off valve, opening a trunk line medium introducing channel, introducing the trunk line medium into a downstream output branch line through a pipeline of a production and discharge control system, and simultaneously opening the downstream discharge cut-off valve and the discharge regulating valve to open a replacement system;
step three: after replacement, entering a pressurizing stage of a branch pipeline, adjusting the trunk line downloading amount to the pressurizing output, and keeping the trunk line downloading amount to the pressurizing output and keeping the branch introducing flow stable by adjusting the parameters of a regulating valve and a heat exchanger in a production and release control system; after the pressure of the downstream branch line reaches more than 3MPa, the production and discharge control system can be directly closed, and the main line medium is directly introduced through a branch line regulating valve;
step four: after the pipeline is filled, the final stop valve and the final regulating valve are immediately opened, and the pipeline system performs trial operation according to the filling flow, so that the medium replacement and pressure filling process of the production is completed, and the complete production of the system is realized by controlling the rated branch flow.
Compared with the prior art, the invention has the following positive effects: based on the carbon dioxide phase characteristics and objective constraint and demand of branch pipeline production, the invention aims at the problems of medium flow control, temperature control, pressure filling and the like before branch supercritical carbon dioxide pipeline transportation production, and respectively sets a main line medium introducing system, a production and discharge control system, a tail end discharge system, an instrument detection system and the like from the angles of main line flow stabilization, safe replacement, step pressure filling and the like, and realizes safe and efficient replacement and pressure filling of the branch pipeline under the condition of providing main line stable load, thereby providing references and references for production operation of the branch supercritical carbon dioxide pipeline.
The concrete steps are as follows:
(1) Setting science
Aiming at the operation characteristics of a supercritical carbon dioxide trunk pipeline and the characteristics of supercritical carbon dioxide media, the invention sets a trunk medium introducing system, a production and discharge control system, a tail end discharge system, an instrument detection system and the like by taking the guarantee of the transportation stability of the trunk in the process of controlling branch line production as a basic principle, and on one hand, the invention strictly controls the flow according to a set introducing flow value, and on the other hand, the invention safely regulates and regulates the temperature of the introduced supercritical carbon dioxide, thereby avoiding the system blockage and the pipeline system material risk caused by the low temperature after the pressure regulation. Furthermore, a multi-order flow control system is arranged, so that the flow rate of the replacement process is controllable, and the high efficiency and the high speed of the pressurizing process are ensured. In addition, in order to avoid the influence of branch line replacement, pressurization and the like on the trunk line transportation in the emergency, a temporary discharge system of a branch line head station is arranged, and the medium which cannot be consumed in the emergency of the branch line is discharged through the emergency discharge system, so that the influence on the stable transportation of the trunk line is avoided. Therefore, by arranging the system, the safe and efficient replacement and pressure filling of the branch pipeline are realized.
(2) Good economical efficiency
In the replacement process, the system greatly reduces the branch line replacement time and improves the replacement efficiency by utilizing the pipe cleaner to perform isolation replacement; in the production and release control system, through setting up multistage governing valve and many empty bath heat exchangers of arranging of two-stage, avoided the dry ice jam risk of production system, improved replacement and production efficiency, and through temperature regulation back, the medium temperature that gets into downstream branch line pipeline is higher than the allowable use temperature of carbon steel material, has ensured the material safety of system, avoids service drum, first station pipeline, first station valve etc. to adopt low temperature material, has generally improved the economic nature of system construction and operation. Furthermore, the empty bath type heat exchanger in the production and release control system is only a temporary facility, has the characteristics of being detachable and reusable, and the like, and improves the use efficiency of equipment.
(3) Promote the development of technology
At present, operation of branch supercritical carbon dioxide pipelines is not developed in China, the scheme provided by the system plays an important role in engineering guidance and reference, and the provided key process system configuration and method such as stable trunk flow, safe and efficient replacement, efficient pressurization and the like can be used for considering the reliability and safety of production and later operation, so that the technical progress in the field is promoted.
Drawings
The invention will be described by way of specific embodiments and with reference to the accompanying drawings in which
Fig. 1 is a schematic structural view of the present invention.
The marks in the figure: the method comprises the steps of 1, accessing a carbon dioxide branch line into a pipeline, 2, intercepting a branch line inlet valve, 3, regulating a branch line valve, 4, intercepting a branch line second valve, 5, transmitting a branch line pressure, 6, transmitting a branch line inlet flow, 7, intercepting a first pipe cleaning valve, 8, intercepting a pipe cleaning second valve, 9, 10, bypassing a first branch line bypass, 11, intercepting a first branch line bypass valve, 12, intercepting a second branch line bypass valve, 13, bypassing a second branch line bypass, 14, transmitting a ball cleaning barrel, 21, regulating a first-stage regulating valve, 22, a pipeline after regulating a first-stage regulating valve, 23, a first-stage air bath heat exchanger, 24, a second-stage regulating valve, 25, a filter, 26, a second-stage air bath heat exchanger, 27, a pipeline after regulating a second-stage regulating valve, 28, a vent pipeline, 29, a vent riser, 30, 31, 32, 33, 34, 35, 36, and 43, and 44.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the present invention as understood by those skilled in the art, merely for convenience of describing the present invention and simplifying the description, and is not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as indicating or implying a relative importance.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, a branch supercritical carbon dioxide pipeline production system comprises a main medium introducing system, a production and discharge control system, a tail end discharge system and an instrument detection system. By arranging the system, a supporting condition is provided for high-efficiency and safe production of branch supercritical carbon dioxide pipelines expanded on a conveying trunk line.
The trunk medium introducing system is connected with an upstream supercritical carbon dioxide trunk pipeline and is used for introducing trunk medium into a branch line system, and the trunk medium introducing system is provided with a pressure regulating bypass in the branch line production process and provides functions of medium discharging facilities and the like in emergency situations in the branch line production process; it should be noted that the trunk medium introduction system also provides a conventional branch pipeline pig system, but is not a particular technical requirement of the present invention, and is described only for the purpose of ensuring functional integrity.
Specifically, the trunk line medium introducing system comprises a carbon dioxide branch line access pipeline 1, a branch line first bypass 10 and a branch line second bypass 13, wherein the carbon dioxide branch line access pipeline 1 is made of carbon steel, is connected with an upstream supercritical carbon dioxide trunk line pipeline and is used for providing a branch line downloading access function; the carbon dioxide branch line access pipeline 1 is sequentially provided with a branch line inlet cut-off valve 2, a branch line regulating valve 3 and a branch line second cut-off valve 4 along the medium flow direction, wherein the branch line inlet cut-off valve 2 is made of carbon steel, and is a full-diameter electric ball valve and normally open and used for controlling the starting and closing of the branch line pipeline; the branch line regulating valve 3 is made of carbon steel, is an electric regulating valve and is normally open (closed before operation) and is used for controlling the medium flow of a branch line and regulating the pressure after introduction; the branch second cut-off valve 4 is made of carbon steel, and is closed before production; a branch line pressure transmitter 5 is arranged at the downstream of the branch line second cut-off valve 4 and is used for detecting the pressure after the regulation of the branch line pressure in real time; a branch inlet flow transmitter 6 is arranged at the downstream of the branch inlet cut-off valve 2 and is used for detecting the carbon dioxide flow introduced by a branch in real time, preferably a coriolis flowmeter; the downstream of the branch pipe second cut-off valve 4 is provided with a pipe cleaning component, the pipe cleaning component comprises a pipe cleaning ball barrel 14, a pipe cleaning first cut-off valve 7, a branch pipe cleaning cut-off valve 8 and a pipe cleaning second cut-off valve 9, the pipe cleaning first cut-off valve 7 is connected with the large end of the pipe cleaning ball barrel 14, the branch pipe cleaning cut-off valve 8 is connected to the outlet end of the pipe cleaning ball barrel 14, the pipe cleaning first cut-off valve 7 and the pipe cleaning second cut-off valve 9 are electric ball valves, are made of carbon steel, are only opened under the working conditions of branch pipe head station replacement and pipe cleaning, and are closed immediately after the pipe cleaner is sent out; the branch pipe cleaning stop valve 8 is an electric ball valve and made of carbon steel, and is closed only under the working conditions of branch pipe head station replacement and pipe cleaning, and the pipe cleaner is opened immediately after being sent out; the first branch line bypass 10 is arranged at the downstream of the branch line inlet cut-off valve 2 and is made of carbon steel material and used for providing an inlet channel for connecting a production and discharge control system, the first branch line bypass 10 is provided with a first branch line cut-off valve 11, and the first branch line cut-off valve 11 is a manual ball valve and is made of carbon steel material and is opened only when the production and discharge control system is started; the branch line second bypass 13 is arranged at the downstream of the branch line second cut-off valve 4 and made of carbon steel and used for providing an outlet channel for connecting the production and release control system, the branch line second bypass cut-off valve 12 is arranged on the branch line second bypass 13, and the branch line second bypass cut-off valve 12 is a manual ball valve and made of carbon steel and is opened only when the production and release control system is started.
The system comprises a main line medium introducing system, a production and release control system, a pressure regulating bypass, a pressure regulating control system and a pressure regulating control system, wherein the production and release control system is connected with the pressure regulating bypass of the main line medium introducing system and is used for controlling the flow and regulating the pressure of a production medium downloaded by the main line, and meanwhile, temperature compensation is carried out on the low-temperature medium at the initial stage after pressure regulation, so that the minimum temperature requirement of filling the medium into a downstream branch line is met.
Specifically, the production and release control system comprises a first-stage regulating valve rear pipeline 22, a second-stage regulating valve rear pipeline 27 and an emptying assembly, wherein the first-stage regulating valve rear pipeline 22 is connected with the branch first bypass cut-off valve 11 through a first-stage regulating valve 21, namely the first-stage regulating valve 21 is arranged at the downstream of the branch first bypass cut-off valve 11, and is made of an electric regulating valve and carbon steel material and used for carrying out first pressure regulation and flow control on supercritical carbon dioxide introduced by a trunk line in a production stage, and the pressure is stabilized to be more than 3MPa after the pressure regulation; the secondary regulating valve rear pipeline 27 is connected with the branch line second bypass cut-off valve 12, and a primary air-bath heat exchanger 23, a secondary regulating valve 24, a filter 25 and a secondary air-bath heat exchanger 26 are sequentially arranged between the primary regulating valve rear pipeline 22 and the secondary regulating valve rear pipeline 27 along the medium flow direction, namely the primary regulating valve rear pipeline 22 is connected with the primary regulating valve 21 and the primary air-bath heat exchanger 23, and is made of low Wen Tangang materials; the primary air-bath heat exchanger 23 is arranged at the downstream of the primary regulating valve 21, is made of a low Wen Tangang material and is a multi-tube-bundle air-bath heat exchanger and is used for regulating the temperature of low-temperature carbon dioxide after primary pressure regulation, improving the medium temperature before secondary pressure regulation and avoiding freezing and blocking of the medium after secondary pressure regulation; the secondary regulating valve 24 is arranged at the downstream of the primary air-bath heat exchanger 23 and is used for regulating secondary pressure of the medium and meeting the pressure requirements of downstream pipeline replacement and pressurization; the filter 25 is made of a low Wen Tangang material and is used for carrying out secondary filtration on solid impurities of supercritical carbon dioxide introduced from the upstream, so that erosion on downstream branch pipelines, valves and the like due to higher medium flow rate in initial replacement is avoided; the second-stage air-bath heat exchanger 26 is arranged at the downstream of the filter 25, is made of low Wen Tangang material, is a multi-tube bundle air-bath heat exchanger, and is used for regulating the temperature of low-temperature carbon dioxide subjected to second-stage pressure regulation, improving the temperature of media entering a downstream branch pipeline and guaranteeing the material safety of a long-distance branch pipeline system; the secondary regulating valve rear pipeline 27 is connected with the secondary air bath heat exchanger 26 and the branch second bypass cut-off valve 12, and is made of carbon steel.
Specifically, the emptying assembly is connected downstream of the secondary regulating valve 24, the emptying assembly comprises an emptying pipeline 28 and an emptying vertical pipe 30, the emptying pipeline 28 is connected with the secondary regulating valve 24 and the emptying vertical pipe 30, and is made of low-temperature carbon steel and used for distributing part of carbon dioxide to the emptying vertical pipe for treatment in an emergency, so that the influence on the flow stability of an upstream trunk line is reduced; the emptying pipeline 28 is provided with an emptying flow regulating valve 29, and the emptying flow regulating valve is an electric regulating valve, is made of low Wen Tangang material and is used for controlling the medium flow discharged to the emptying stand pipe in emergency; a vent riser 30 is provided downstream of the vent flow regulator valve 29 at a height of not less than 20m for venting the emergency bleed medium. Further, an initial carbon dioxide injection valve is arranged on the pipeline 22 behind the first-stage regulating valve and is used for injecting pressurized carbon dioxide into the production and release control system before production, the injection pressure is not lower than 2.0MPa, and the temperature of the system in the initial stage of multistage pressure regulation is prevented from being lower than-40 ℃.
The tail end discharge system is arranged in a branch line tail end station yard and is used for emptying nitrogen stored in a pipeline in the initial production process, monitoring the gas composition of the tail end of the pipeline for a long time, indicating replacement conditions and determining the upstream branch line pressurization starting time point.
Specifically, the end bleed system includes a bleed branch pipe 45 and a bleed riser 44, and a bleed shut-off valve 41, a bleed regulator valve 42, and a sampling valve 43 are sequentially provided on the bleed branch pipe 45. The relief cut-off valve 41 is made of carbon steel, and is arranged on a relief branch pipe in front of a last station inlet and is opened in a production replacement stage; the discharge regulating valve 42 is an electric regulating valve, the opening control of which is interlocked with the primary regulating valve 21 and the secondary regulating valve 24 and is used for controlling the discharge flow of the system and providing the backpressure control function of branch lines in the replacement process, and the control pressure is 0.1-0.2MPa; a sampling valve 43 is arranged downstream of the discharge regulating valve 42 for sampling and testing the discharged medium in the process of production replacement; a bleed standpipe 44 is provided downstream of the bleed regulator valve 42 to safely bleed off media, such as nitrogen, carbon dioxide, etc., during a production replacement process.
The instrument detection system comprises a plurality of pressure transmitters and temperature transmitters and is used for monitoring the temperature and the pressure of key points in the production process and feeding back the temperature and the pressure to the production system.
Specifically, the instrument detection system comprises a pressure transmitter 31 after primary pressure regulation, a temperature transmitter 32 after primary pressure regulation, a temperature transmitter 33 after primary heat exchange, a pressure transmitter 34 after secondary pressure regulation, a temperature transmitter 35 after secondary pressure regulation and a temperature transmitter 36 after secondary heat exchange, wherein the pressure transmitter 31 after primary pressure regulation and the temperature transmitter 32 after primary pressure regulation are arranged at the downstream of the primary regulating valve 21, the temperature transmitter 33 after primary heat exchange is arranged at the downstream of the primary air bath type heat exchanger 23, the pressure transmitter 34 after secondary pressure regulation and the temperature transmitter 35 after secondary pressure regulation are arranged at the downstream of the filter 25, and the temperature transmitter 36 after secondary heat exchange is arranged at the downstream of the secondary air bath type heat exchanger 26.
The working principle of the invention is as follows:
(1) General principle. The supercritical carbon dioxide pipeline delivery pressure is high (above the critical pressure, typically the critical pressure of carbon dioxide is 7.3 MPa). Before the pipeline is put into production, nitrogen is generally adopted for drying, so that the gas stored in the branch pipeline is dry nitrogen and must be replaced before the branch pipeline is put into production; for safe and efficient replacement, supercritical carbon dioxide introduced by a trunk line is utilized for displacement, nitrogen-pig-carbon dioxide isolation is carried out by means of a branch line cleaning system, a replacement process is controlled and detected by a terminal discharge system, and a replacement effect is guaranteed. And after the replacement is finished, the branch line is filled with the carbon dioxide continuously introduced by the main line, and the pressure of the branch line is continuously increased until all media are turned into a supercritical state, so that the production condition is achieved.
(2) And (3) a replacement process. Specifically, in the replacement process, when supercritical carbon dioxide in an upstream trunk line is directly regulated to normal pressure, low temperature of about-90 ℃ is generated, so that solid dry ice is easy to generate, a pipeline system is blocked, and meanwhile, serious damage is brought to a carbon steel material of a branch line system. Therefore, a production and release control system is arranged, two-stage pressure regulation and two-stage air bath type heat exchange are considered, introduced carbon dioxide is regulated to enter a gas-liquid two-phase region through the first-stage pressure regulation, then the temperature of the carbon dioxide is further increased through the first-stage air bath type heat exchange, dry ice production conditions are avoided after the second-stage pressure regulation, the pressure is reduced to normal pressure (or the pressure is gradually increased in the pressurizing process) through the second-stage pressure regulation, and the temperature of an outlet medium is continuously increased to the safe service temperature of the carbon steel through the second-stage heat exchange; particularly, because the main pipeline continuously and stably conveys the supercritical carbon dioxide, the main pipeline production process should not influence the main pipeline conveying stability, and therefore, a venting system is arranged, so that excessive carbon dioxide is timely vented under the emergency condition of insufficient heat exchange temperature, the heat exchange load is reduced, and the conventional method of controlling the introduced flow is avoided, so that the main pipeline flow greatly fluctuates.
(3) And (5) a pressurizing process. Specifically, after the replacement is completed, the outlet of the branch end station is required to be closed, and the pipeline is continuously filled with the introduced medium. By means of the set production and discharge control system, stability of the introduced flow is guaranteed preferentially, the opening of the regulating valve is adjusted in real time, and continuous rising of pressure in the pipeline and stable input of the flow are dealt with. When the pressure in the downstream branch pipeline reaches more than 3MPa, the pressure difference between the trunk line and the branch pipeline is reduced, and the throttling temperature is reduced, so that the throttling temperature can be directly led into a branch regulating system, carbon dioxide is filled into the branch pipeline through a branch regulating valve, and the pressure in the branch pipeline is finally increased to be slightly equal to the pressure of the trunk line, so that the production condition is achieved. Similar to the replacement process, when an emergency occurs, carbon dioxide which is downloaded by the trunk line but cannot be timely consumed by the branch line is still sent to the emptying system for discharge, so that the stability of the trunk line flow is prevented from being disturbed.
(4) And (5) a production process. Specifically, by simultaneously opening the last stop valve and the regulating valve, the branch regulating valve is gradually regulated, and the branch pipeline gradually reaches the hydraulic condition of stable flow in cooperation with the regulation of the main pipeline conveying capacity, so that the production operation is completed.
The invention also relates to a production method adopting the branch supercritical carbon dioxide pipeline production system, which comprises the following steps:
step one: before branch supercritical carbon dioxide pipeline delivery, keeping the trunk pipeline normally delivering, keeping the branch inlet cut-off valve closed, and keeping the branch regulating valve and the branch second cut-off valve closed. When the branch supercritical carbon dioxide pipeline is ready to be put into production, two types of branch downloading delivery steps are planned: first, displacement yield and second, pressurization yield.
Wherein the displacement yield is set according to the principle that the gas flow rate at the time of pigging by branch pipeline displacement is not more than 5m/s (under the displacement pressure), thereby downloading the displacement yield from the trunk line and determining the downloading time; the charge production is considered as two to three times the displacement production. Meanwhile, parameters such as a primary regulating valve, a primary air-bath heat exchanger, a secondary regulating valve and a secondary air-bath heat exchanger in the production and release control system are determined according to the set values of the displacement yield and the pressurizing yield, so that stable trunk downloading flow in the production process and minimum safe temperature limit requirements of branch conveying pipelines are met by the temperature of the trunk medium after pressure regulation are ensured.
Step two: introducing supercritical carbon dioxide from a trunk line to replace nitrogen pre-filled before production in a branch line, wherein the nitrogen pre-filled before production in the branch line is specifically: firstly, injecting pressurized carbon dioxide into the downstream of the branch inlet cut-off valve to build back pressure, namely injecting carbon dioxide with the pressure of about 2.0-2.3MPa from an injection port between the branch inlet cut-off valve and the branch regulating valve, so that the supercritical carbon dioxide of an upstream trunk line is prevented from being lower than-20 ℃ due to differential pressure throttling after the branch inlet cut-off valve is opened, and the material safety of the section of pipeline is ensured; and opening a branch line inlet cut-off valve, communicating an upstream trunk line with a branch line inlet section, stabilizing pressure, sequentially opening a first bypass cut-off valve, a primary regulating valve, a secondary regulating valve and a branch line second bypass cut-off valve, opening a trunk line medium introducing channel, and introducing the trunk line medium into a downstream output branch line through a pipeline of a production and release control system. Further, the first-stage air-bath heat exchanger and the second-stage air-bath heat exchanger are started, the branch carbon dioxide flow is controlled to meet the replacement yield set in the first step through the operation, the temperature of the downstream of the first-stage regulating valve is higher than-40 ℃ (dry ice generation is avoided), the temperature of the downstream medium of the second-stage air-bath heat exchanger is higher than-15 ℃, and the material safety of the branch pipeline is guaranteed. Simultaneously, the downstream bleed off valve and the bleed off regulating valve are opened to open the replacement system. After the branch pipe cleaning stop valve is maintained to be opened for 10 minutes, a pipe cleaner is put into the pipe cleaning ball-sending cylinder, the branch pipe cleaning stop valve is closed, the pipe cleaning first stop valve and the pipe cleaning second stop valve are opened, the introduced carbon dioxide and carbon dioxide/nitrogen mixed gas in the branch pipe are isolated by the pipe cleaner, and the replacement efficiency is improved by the isolation of the pipe cleaner. After the pipe cleaner is sent out, the branch pipe cleaning stop valve is opened again, and the pipe cleaning first stop valve and the pipe cleaning second stop valve are closed. After the pipe cleaner reaches a pipe cleaning ball collecting cylinder of a downstream end station, a sampling valve is opened, and continuous sampling is carried out to detect the carbon dioxide content; after the sampling index meets the branch line conveying requirement, the replacement is completed, the relief cut-off valve, the relief regulating valve, the sampling valve and the relief vertical pipe are closed, and the branch line pipeline pressure filling stage is entered. Further, in the step, if the temperature of the medium at the downstream of the secondary air-bath heat exchanger deviates from a set early warning value, in order not to interfere the normal transportation of a main pipeline, a vent flow regulating valve is immediately opened, and part of carbon dioxide to be introduced into a branch line passes through a vent vertical pipe to be directly discharged.
Step three: after the replacement is finished, the main line downloading amount is adjusted to the pressurizing output after entering a pressurizing stage of a branch pipeline, specifically, parameters of a primary regulating valve, a primary air-bath type heat exchanger, a secondary regulating valve and a secondary air-bath type heat exchanger are adjusted, the main line downloading amount is kept to be the pressurizing output, the temperature of the downstream of the primary regulating valve is higher than-40 ℃ (dry ice generation is avoided), and the medium temperature of the downstream of the secondary air-bath type heat exchanger is always higher than-15 ℃. And the opening of the primary regulating valve and the opening of the secondary regulating valve are dynamically increased along with the lifting of the downstream pressure, so that the stability of the introduced flow of the branch line is kept. In the step, if the temperature of the medium at the downstream of the secondary air-bath heat exchanger deviates from a set early warning value, a vent flow regulating valve is immediately opened in order not to interfere the normal transportation of a main pipeline, and part of carbon dioxide to be introduced into a branch line is directly discharged through a vent vertical pipe. After the pressure of the downstream branch line reaches more than 3MPa, the medium temperature after pressure regulation caused by the pressure difference between the main line and the branch line is higher than-10 ℃, so that the production and release control system can be directly closed, and the main line medium is directly introduced through the branch line regulating valve 3.
Step four: after the pipeline is filled, the final stop valve and the final regulating valve are immediately opened, and the pipeline system performs trial operation according to the filling flow, so that the medium replacement and pressure filling process of production is completed, and the complete production of the system can be realized by further controlling the rated branch flow.
The invention is not limited to the specific embodiments described above, but extends to any novel one, or any novel combination, of the features disclosed in this specification, and to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (9)
1. A branch supercritical carbon dioxide pipeline production system is characterized in that: the system comprises a trunk medium introducing system, a production and discharge control system, a tail end discharge system and an instrument detection system;
the trunk medium introducing system is connected with an upstream supercritical carbon dioxide trunk pipeline and is used for introducing trunk medium into a branch line system, and the trunk medium introducing system is provided with a branch line production process pressure regulating bypass;
the production and release control system is connected with a pressure regulating bypass of the trunk line medium introducing system and is used for controlling flow and regulating pressure of the production medium downloaded by the trunk line, compensating temperature of the low-temperature medium at the initial stage after pressure regulation, and emptying the medium downloaded by the trunk line under an emergency working condition;
the tail end discharge system is arranged at a branch end station yard and is used for evacuating nitrogen stored in a pipeline in the initial production process and monitoring the gas components at the tail end of the pipeline;
the instrument detection system comprises a plurality of pressure transmitters and temperature transmitters and is used for monitoring the temperature and the pressure of key points in the production process.
2. The branch line supercritical carbon dioxide pipeline production system of claim 1, wherein: the trunk line medium introducing system comprises a carbon dioxide branch line access pipeline (1), a branch line first bypass (10) and a branch line second bypass (13);
the carbon dioxide branch line access pipeline (1) is connected with an upstream supercritical carbon dioxide main pipeline, and a branch line inlet cut-off valve (2), a branch line regulating valve (3) and a branch line second cut-off valve (4) are sequentially arranged on the carbon dioxide branch line access pipeline (1) along the medium flow direction;
the first branch line bypass (10) is arranged at the downstream of the branch line inlet cut-off valve (2) and is used for providing an inlet channel for connecting a production and discharge control system, and the first branch line bypass (10) is provided with a first branch line bypass cut-off valve (11);
the branch line second bypass (13) is arranged at the downstream of the branch line second cut-off valve (4) and used for providing an outlet channel for connecting the production and release control system, and the branch line second bypass (13) is provided with the branch line second bypass cut-off valve (12).
3. The branch line supercritical carbon dioxide pipeline production system of claim 2, wherein: a branch inlet flow transmitter (6) is arranged at the downstream of the branch inlet cut-off valve (2) and is used for detecting the carbon dioxide flow introduced by a branch in real time; and a branch line pressure transmitter (5) is arranged at the downstream of the branch line second cut-off valve (4) and is used for detecting the pressure after the branch line pressure is regulated in real time.
4. The branch line supercritical carbon dioxide pipeline production system of claim 2, wherein: the utility model provides a branch road second stop valve (4) low reaches is provided with the pigging subassembly, the pigging subassembly includes pigging ball section of thick bamboo (14), pigging first stop valve (7), branch road pigging stop valve (8) and pigging second stop valve (9), pigging first stop valve (7) link to each other with pigging ball section of thick bamboo (14) large end, branch road pigging stop valve (8) are connected at pigging ball section of thick bamboo (14) exit end, pigging first stop valve (7) and pigging second stop valve (9) are opened under the first station replacement of branch road and pigging operating mode only, and the pig is sent the back and is closed immediately, the first station replacement of branch road pigging stop valve (8) is closed under the operating mode of pigging only, and the pig is sent back and is opened immediately.
5. The branch line supercritical carbon dioxide pipeline production system of claim 2, wherein: the production and discharge control system comprises a first-stage regulating valve rear pipeline (22), a second-stage regulating valve rear pipeline (27) and an emptying assembly, wherein the first-stage regulating valve rear pipeline (22) is connected with a branch first bypass cut-off valve (11) through a first-stage regulating valve (21), the second-stage regulating valve rear pipeline (27) is connected with a branch second bypass cut-off valve (12), a first-stage empty bath type heat exchanger (23), a second-stage regulating valve (24), a filter (25) and a second-stage empty bath type heat exchanger (26) are sequentially arranged between the first-stage regulating valve rear pipeline (22) and the second-stage regulating valve rear pipeline (27) along the medium flow direction, and the emptying assembly is connected to the downstream of the second-stage regulating valve (24).
6. The branch line supercritical carbon dioxide pipeline production system of claim 5, wherein: the emptying assembly comprises an emptying pipeline (28) and an emptying vertical pipe (30), the emptying pipeline (28) is connected with a secondary regulating valve (24) and the emptying vertical pipe (30), and an emptying flow regulating valve (29) is arranged on the emptying pipeline (28).
7. The branch line supercritical carbon dioxide pipeline production system of claim 1, wherein: the tail end relief system comprises a relief branch pipe (45) and a relief vertical pipe (44), wherein a relief cut-off valve (41), a relief regulating valve (42) and a sampling valve (43) are sequentially arranged on the relief branch pipe (45).
8. The branch line supercritical carbon dioxide pipeline production system of claim 5, wherein: the instrument detection system comprises a pressure transmitter (31) after primary pressure regulation, a temperature transmitter (32) after primary pressure regulation, a temperature transmitter (33) after primary heat exchange, a pressure transmitter (34) after secondary pressure regulation, a temperature transmitter (35) after secondary pressure regulation and a temperature transmitter (36) after secondary heat exchange, wherein the pressure transmitter (31) after primary pressure regulation and the temperature transmitter (32) after primary pressure regulation are arranged at the downstream of a primary regulating valve (21), the temperature transmitter (33) after primary heat exchange is arranged at the downstream of a primary air bath type heat exchanger (23), the pressure transmitter (34) after secondary pressure regulation and the temperature transmitter (35) after secondary pressure regulation are arranged at the downstream of a filter (25), and the temperature transmitter (36) after secondary heat exchange is arranged at the downstream of a secondary air bath type heat exchanger (26).
9. A method of commissioning a branch supercritical carbon dioxide pipeline commissioning system as claimed in any one of claims 1 to 8, wherein: the method specifically comprises the following steps:
step one: before branch supercritical carbon dioxide pipeline delivery, keeping the trunk pipeline normally delivering, keeping the branch inlet cut-off valve closed, and keeping the branch regulating valve and the branch second cut-off valve closed;
step two: introducing supercritical carbon dioxide from a trunk line to replace nitrogen pre-filled before production in a branch line, wherein the nitrogen pre-filled before production in the branch line is specifically: injecting pressurized carbon dioxide into the downstream of the branch inlet cut-off valve to build back pressure, opening the branch inlet cut-off valve, connecting an upstream trunk line with the branch inlet section, sequentially opening a first bypass cut-off valve, a first-stage regulating valve, a second-stage regulating valve and a branch second bypass cut-off valve, opening a trunk line medium introducing channel, introducing the trunk line medium into a downstream output branch line through a pipeline of a production and discharge control system, and simultaneously opening the downstream discharge cut-off valve and the discharge regulating valve to open a replacement system;
step three: after replacement, entering a pressurizing stage of a branch pipeline, adjusting the trunk line downloading amount to the pressurizing output, and keeping the trunk line downloading amount to the pressurizing output and keeping the branch introducing flow stable by adjusting the parameters of a regulating valve and a heat exchanger in a production and release control system; after the pressure of the downstream branch line reaches more than 3MPa, the production and discharge control system can be directly closed, and the main line medium is directly introduced through a branch line regulating valve;
step four: after the pipeline is filled, the final stop valve and the final regulating valve are immediately opened, and the pipeline system performs trial operation according to the filling flow, so that the medium replacement and pressure filling process of the production is completed, and the complete production of the system is realized by controlling the rated branch flow.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723540.7A CN117307968A (en) | 2022-06-24 | 2022-06-24 | System and method for branch supercritical carbon dioxide pipeline production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723540.7A CN117307968A (en) | 2022-06-24 | 2022-06-24 | System and method for branch supercritical carbon dioxide pipeline production |
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| CN202210723540.7A Pending CN117307968A (en) | 2022-06-24 | 2022-06-24 | System and method for branch supercritical carbon dioxide pipeline production |
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