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CN114688447B - Receiving system of long-distance large-diameter pipeline and starting method thereof - Google Patents

Receiving system of long-distance large-diameter pipeline and starting method thereof Download PDF

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Publication number
CN114688447B
CN114688447B CN202011590269.1A CN202011590269A CN114688447B CN 114688447 B CN114688447 B CN 114688447B CN 202011590269 A CN202011590269 A CN 202011590269A CN 114688447 B CN114688447 B CN 114688447B
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China
Prior art keywords
pipeline
low
storage tank
temperature storage
valve
Prior art date
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Application number
CN202011590269.1A
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Chinese (zh)
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CN114688447A (en
Inventor
杨卫东
李建亮
朱晓东
钟向宏
张远领
赵启鹏
王凯
汤亚田
胡鹏
孙海霞
韩旭
雷远振
高维乐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lianyungang Petrochemical Co Ltd
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Lianyungang Petrochemical Co Ltd
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Priority to CN202011590269.1A priority Critical patent/CN114688447B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F17C5/04—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases requiring the use of refrigeration, e.g. filling with helium or hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/021—Special adaptations of indicating, measuring, or monitoring equipment having the height as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • F17C13/081—Mounting arrangements for vessels for large land-based storage vessels
    • 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
    • F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
    • 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
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
    • 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
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/14—Conveying liquids or viscous products by pumping
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/0126—One vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0376—Dispensing pistols
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0369—Localisation of heat exchange in or on a vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0631—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/023—Avoiding overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a receiving system of a long-distance large-diameter pipeline and a starting method thereof, wherein the receiving system comprises a wharf side, a long-distance conveying pipeline and a tank area side; the dock side comprises two or more berths, wherein at least one berth is connected with the material conveying device, and at least one berth is connected with the low-temperature nitrogen supply device; the long-distance conveying pipeline comprises a pipeline I which is more than or equal to DN800 and a pipeline II which is less than or equal to DN300, wherein the pipeline I is used for conveying materials; the second pipeline is used for circulating cold energy; the first pipeline and the second pipeline are respectively connected with the material conveying device and the low-temperature nitrogen supply device; at least one nitrogen injection port is arranged on the first pipeline, and each nitrogen injection port is connected with a liquid nitrogen injection device; the tank farm side comprises a low-temperature storage tank, a torch system and a reliquefaction system, and the tail ends of the first pipeline and the second pipeline are connected to the low-temperature storage tank. The receiving system and the starting method provided by the invention can greatly save the starting cost, reduce the berthing time of the ethane ship and realize nitrogen precooling, solid-gas replacement and liquid hydrocarbon liquid inlet seamless connection.

Description

Receiving system of long-distance large-diameter pipeline and starting method thereof
Technical Field
The invention relates to a receiving system of a long-distance large-diameter pipeline and a start-up method thereof, and belongs to the technical field of chemical industry.
Background
The construction land of the domestic comprehensive utilization project of ethane is large, and the construction land is built in a chemical industry park, and the construction land is generally far away from a wharf, and the longest ethane conveying pipeline can reach more than 10 km. The ethane delivery line of such length is fully cooled, i.e., precooled, prior to the actual introduction of cryogenic liquid at the time of first-time administration. The ethane delivery line is generally made of low-temperature stainless steel, which has excellent low-temperature performance, but has a large linear expansion coefficient, and the shrinkage rate of the stainless steel is about three thousandths under the condition of LNG temperature, so that measures are taken to prevent damage caused by cold shrinkage during design. The shrinkage and compensation of the ethane line is an important issue to be carefully considered, and the stress between the two fixing points due to cold shrinkage may well exceed the yield point of the material. Therefore, it is necessary to pre-cool the large-diameter process pipeline before use.
At present, some domestic liquefied hydrocarbon unloading systems are pre-cooled by adopting real-gas pre-cooling, the ship period needs to be determined in advance, and the dock berthing time of the liquefied hydrocarbon ship is finally determined according to the actual pre-cooling effect. The ship berth terminal generates additional cost, and the cost is increased by about 100 ten thousand RMB (RMB) per 1d of berth time. The liquid nitrogen precooling is adopted without the part of cost, and the total time is longer from the berthing of the liquefied hydrocarbon ship to the end of precooling. When the solid gas precooling is adopted, firstly, after the light hydrocarbon is gasified, the low-temperature gas is utilized to initially precool the discharging pipeline, and after the temperature is reduced, the liquefied hydrocarbon precooling can be directly carried out. According to practical experience, a real-gas pre-cooling unloading system is adopted, so that the time is generally longer, and the consumption of liquefied hydrocarbon is more. This is mainly due to the fact that the gasifier capacity on a liquefied hydrocarbon vessel is usually small and the minimum temperature of the cryogenic gas after gasification cannot exceed the pipeline design temperature (ethane pipeline design temperature is typically around-100 ℃ and ethane boiling point is-89 ℃), which is still slightly higher than cryogenic nitrogen.
In the pre-cooling process of the ethane gas, the BOG compressor is not run on trial, and the generated low-temperature gas is sent to a torch for burning and emptying, so that energy waste is caused, and the atmosphere is polluted. For longer projects of discharge pipelines (domestic longest pipelines about 10 km). The liquefied hydrocarbon vaporization precooling mode is adopted, and only has 1 port of the wharf, so that multi-port injection is difficult to adopt.
According to experience, pre-cooling of the discharge pipeline is often a process of exposing and finding problems, and the problems that pipeline displacement is over-designed, a cold insulation pipe rack does not move according to a given design and the like usually occur in the whole process. The reasons for these abnormal conditions are not only operation and design matching problems, but also construction accuracy problems. If the real-gas precooling is adopted, the potential hazard degree of the pipeline once the pipeline is in question is correspondingly increased, and the safety of operators and the whole system is threatened.
In order to solve the problems, the invention mainly provides a start-up system and a start-up method for liquid nitrogen pre-cooling, solid gas replacement and liquid hydrocarbon feed liquid, which realize the seamless connection of liquid nitrogen pre-cooling and solid gas replacement and avoid pipeline temperature return caused by the preparation work of berthing, connection, leakage experiment and the like of a cargo ship due to the qualified pipeline pre-cooled by nitrogen.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a receiving system and a starting method which can greatly save the starting cost, reduce the berthing time of an ethane ship and realize nitrogen precooling, solid gas replacement and liquid hydrocarbon liquid inlet seamless connection.
The technical scheme adopted for solving the technical problems is as follows: a receiving system for long-distance large-diameter pipelines, the receiving system comprising a dockside, a long-distance conveying pipeline and a tank farm side; the dock side comprises two or more berths, wherein at least one berth is connected with the material conveying device, and at least one berth is connected with the low-temperature nitrogen supply device; the long-distance conveying pipeline comprises a pipeline I and a pipeline II, wherein the pipeline I is a large-pipe-diameter pipeline which is more than or equal to DN800 and is used for conveying materials; the second pipeline is a small-pipe-diameter pipeline which is less than or equal to DN300 and is used for circulating cold energy, and the cold state of the whole receiving system is kept so as to meet the feeding requirement at any time; the first pipeline and the second pipeline are respectively connected with the material conveying device and the low-temperature nitrogen supply device; the pipeline I and the pipeline II are arranged in parallel, at least one nitrogen injection port is arranged on the pipeline I, and each nitrogen injection port is connected with a liquid nitrogen injection device; the tank farm side comprises a low-temperature storage tank, a torch system and a reliquefaction system, and the tail ends of the first pipeline and the second pipeline are connected to the low-temperature storage tank.
Further, two loading and unloading arms are arranged on each berth. The material conveying device is arranged at the berth at the head end, so that no dead angle is left in real air replacement, and the material conveying device comprises a gas phase output port and a liquid phase output port which are respectively in butt joint with two loading and unloading arms. The low-temperature nitrogen supply device is arranged at a berth at the rear end of the material conveying device; each loading arm is provided with a low-temperature nitrogen supply device respectively, and the two sets of low-temperature nitrogen supply devices can ensure that low-temperature nitrogen is supplied to the system uninterruptedly.
Further, the head ends of the first pipeline and the second pipeline are communicated with each other through a valve; the tail end of the first pipeline is connected to the feed inlet of the low-temperature storage tank through a valve, and the tail end of the second pipeline is connected to the discharge outlet of the low-temperature storage tank through a valve; the tail ends of the first pipeline and the second pipeline are mutually communicated through a valve H, and the valve H is arranged at the front ends of the feed inlet and the discharge outlet of the low-temperature storage tank.
Further, the feed inlet of the low-temperature storage tank comprises an upper feed inlet and a lower feed inlet, a valve J is arranged on the upper feed inlet, and the upper feed inlet extends into the upper part of the low-temperature storage tank through an upper feed pipe; the lower feed inlet is provided with a valve I, and extends into the lower part of the low-temperature storage tank through a lower feed pipe; the upper and lower feed inlets have the functions that: the device is used for mixing materials in the whole low-temperature storage tank, so that the temperature and the density of the materials are uniformly distributed, and layering and material rolling (boiling) are avoided.
The tail end of the first pipeline is connected with a start-up pipeline through a valve, a start-up spraying ring is arranged at the tail end of the start-up pipeline, and the start-up spraying ring is positioned at the inner top of the low-temperature storage tank; and after the material enters the tank, spraying atomized tiny liquid beads through a start-up spraying ring, and pre-cooling the low-temperature storage tank by vaporizing and absorbing heat.
Further, a BOG main pipe is arranged on the low-temperature storage tank and is connected to the reliquefaction system and the torch system, and a sampling port is arranged on the BOG main pipe; the liquid outlet of the reliquefaction system is divided into two paths, one path is connected to the upper feed inlet of the low-temperature storage tank, and the other path is connected to the start-up pipeline; and the second pipeline is communicated with the starting pipeline through a valve. The ethane sprayed from the start-up spraying ring is discharged out of the low-temperature storage tank through the BOG main pipe after being vaporized, and BOG gas is discharged to a torch system before the BOG discharge temperature does not reach the start-up condition of the reliquefaction system; when the BOG discharge temperature reaches the start condition of the reliquefaction system, the BOG gas enters the reliquefaction system, and the liquefied ethane liquid in the reliquefaction system returns to the low-temperature storage tank from the upper feed inlet.
Further, an in-tank pump is arranged in the low-temperature storage tank, an outlet pipeline of the in-tank pump is connected to a discharge port of the low-temperature storage tank, the discharge port is connected with a second pipeline through a valve Q, and the discharge port is connected with a downstream device through a valve R. The feeding of the low-temperature storage tank is divided into two paths by an in-tank pump and is outwards sent out, one path flows to the wharf side through a second pipeline, and the other path returns to the low-temperature storage tank from the wharf side through a second pipeline; one path is directly sent to the downstream device.
Further, the liquid nitrogen injection device comprises a liquid nitrogen tank car or a liquid nitrogen storage tank for supplying liquid nitrogen and a liquid nitrogen injection pipeline connected with the liquid nitrogen tank car or the liquid nitrogen storage tank, the liquid nitrogen injection device has a pressurizing and conveying function and a temperature adjusting function, and a flow instrument, a temperature instrument, a pressure instrument and a valve G are arranged on the liquid nitrogen injection pipeline.
Further, the lengths of the first pipeline and the second pipeline are both larger than 2km, the distance between the first nitrogen injection port and the low-temperature nitrogen supply device is 2-3 km, and the distance between any two nitrogen injection ports is 2-3 km.
A method for starting a receiving system of a long-distance large-diameter pipeline, which mainly comprises the following steps:
1) Precooling the first pipeline and the second pipeline by liquid nitrogen, and keeping a cold state;
2) The second pipeline is subjected to solid gas replacement and liquid filling, and precooling is carried out on the low-temperature storage tank through a start-up spray ring;
3) Carrying out solid gas replacement and liquid filling on the first pipeline at the same time of liquid filling of the second pipeline in the step 2);
4) After the first pipeline and the second pipeline are full of liquid, the first pipeline and the second pipeline enter a start-up spraying ring at the same time, the low-temperature storage tank is pre-cooled, and the re-liquefying system is started in time according to the start-up condition of the re-liquefying system;
5) After the low-temperature storage tank is precooled and a certain liquid level is established, large-flow liquid inlet can be carried out, the start-up spraying ring is stopped, and the liquid inlet of the lower feed inlet is started.
The beneficial effects of the invention are as follows: compared with the prior art, the receiving system and the starting method of the long-distance large-diameter pipeline provided by the invention have the following advantages:
1) The low-temperature nitrogen output by the low-temperature nitrogen supply device at the front end of the pipeline can meet the pre-cooling requirement of the pipeline at the front end part of the pipeline;
2) The low-temperature nitrogen output by the low-temperature nitrogen supply device at the head end of the pipeline can provide sufficient gas for the liquid nitrogen injected into the nitrogen injection port as power to blow off and vaporize the liquid nitrogen, mix cold, continuously supplement the cold in a relay way to the pipeline behind the nitrogen injection port, ensure that the cold at the nitrogen injection port is not concentrated, and avoid affecting the pipeline; in addition, as the low-temperature nitrogen is used for vaporizing the liquid nitrogen, a vaporization device is not required to be arranged at the nitrogen injection port, so that the device is simplified, the occupied area is reduced, and the cost is reduced;
3) The method adopts the liquid nitrogen boosting method for inputting the cold energy, so that the problem that the large-diameter long-distance pipeline is difficult to precool is solved; according to the invention, through the arrangement of the small-diameter pipeline II, the cold quantity in the pipeline can be circulated during non-feeding period, and the cold state of the whole pipeline is kept, so that the feeding requirement can be met at any time, and the energy waste is reduced;
4) According to the invention, by adopting the start-up methods of liquid nitrogen pre-cooling, solid gas replacement and liquid hydrocarbon feed liquid, seamless connection of liquid nitrogen pre-cooling and solid gas replacement is realized, pipeline temperature return caused by preparation work of berthing, connection, leakage experiment and the like of the cargo ship is avoided, the start-up cost can be greatly saved, and the berthing time of the ethane ship is shortened.
Drawings
Fig. 1 is a schematic structural diagram of a receiving system according to the present invention.
Fig. 2 is a schematic diagram of gas flow direction during liquid nitrogen pre-cooling of the receiving system provided by the invention.
Fig. 3 is a schematic diagram of gas flow during the actual gas replacement of the receiving system pipeline according to the present invention.
Fig. 4 is a schematic flow diagram of the receiving system according to the present invention when the pipeline two is filled with liquid and the pipeline one is replaced with air.
Fig. 5 is a schematic flow diagram of a second-in spray ring of a receiving system and a first-in liquid of the receiving system.
Fig. 6 is a schematic flow diagram of the receiving system provided by the invention when the first pipeline and the second pipeline enter the spraying ring and are re-liquefied and opened.
Fig. 7 is a schematic flow diagram of a formal feed of a receiving system according to the present invention.
Fig. 8 is a schematic flow diagram of the receiving system according to the present invention when circulating cooling.
Wherein, 1-the material transporting device; 2-a gas phase outlet; 3-a liquid phase outlet; 4-cryogenic nitrogen supply means; 5-a loading arm; 6-first pipeline; 7-a second pipeline; 8-liquid nitrogen injection device; 9-liquid nitrogen injection pipeline; 10-a nitrogen injection port; 11-a lower feed inlet; 12-upper feed inlet; 13-starting a spraying ring; 14-a low-temperature storage tank; 15-in-tank pump; a 16-BOG header; 17-a reliquefaction system; 18-a flare system; 19-sampling port; 20-downstream device.
Detailed Description
For a specific explanation of the present invention, the present invention will be described in detail below with reference to the drawings and specific examples by taking ethane transportation as an example.
Example 1
As shown in fig. 1 to 7, a receiving system for a long-distance large-diameter pipeline, the receiving system comprising a dockside, a long-distance conveying pipeline and a tank farm side; the wharf side comprises two berths, wherein one berth is connected with the material conveying device 1, and the other berth is connected with the low-temperature nitrogen supply device 4; the long-distance conveying pipeline comprises a pipeline I6 and a pipeline II 7, wherein the pipeline I6 is a large-pipe-diameter pipeline which is more than or equal to DN800 and is used for conveying materials; the second pipeline 7 is a small-pipe-diameter pipeline which is less than or equal to DN300 and is used for circulating cold energy, and the cold state of the whole receiving system is kept so as to meet the feeding requirement at any time; the first pipeline 6 and the second pipeline 7 are respectively connected with the material conveying device 1 and the low-temperature nitrogen supply device 4; the first pipeline 6 and the second pipeline 7 are arranged in parallel, at least one nitrogen injection port 10 is arranged on the first pipeline 6, and each nitrogen injection port 10 is connected with the liquid nitrogen injection device 8; the tank farm side includes a cryogenic storage tank 14, a flare system 18, a reliquefaction system 17, with the ends of both the first and second conduits 6,7 connected to the cryogenic storage tank 14.
Two loading and unloading arms 5 are arranged on each berth. An emergency cut-off valve is arranged on the main pipe behind each loading arm 5 and is respectively a valve A, a valve A ', a valve D and a valve D', and two branch pipes are connected behind the emergency cut-off valve and are connected with the pipeline 1 and the pipeline 2. And each branch pipe is provided with a site hand valve for cutting off the first pipeline 6 and the second pipeline 7, namely a valve B, a valve B ', a valve C', a valve E ', a valve F and a valve F'. The material transportation device 1 is arranged at the forefront berth, so that no dead angle can be ensured to be remained in real air replacement, and the material transportation device 1 comprises a gas phase output port 2 and a liquid phase output port 3 which are respectively in butt joint with two loading and unloading arms 5. The low-temperature nitrogen supply device 4 is arranged at a berth at the rear end of the material conveying device 1; each loading arm 5 is provided with a low-temperature nitrogen supply device 4, and the two sets of low-temperature nitrogen supply devices 4 can ensure that the low-temperature nitrogen is supplied into the system uninterruptedly.
The head ends of the first pipeline 6 and the second pipeline 7 are communicated with each other through a valve; the tail end of the first pipeline 6 is connected to a feed port of the low-temperature storage tank 14 through a valve I and a valve J, the feed port of the low-temperature storage tank 14 comprises an upper feed port 12 and a lower feed port 11, the valve J is arranged on the upper feed port 12, and the upper feed port 12 extends into the upper part of the low-temperature storage tank 14 through an upper feed pipe; the lower feed inlet 11 is provided with a valve I, and the lower feed inlet 11 extends into the lower part of the low-temperature storage tank 14 through a lower feed pipe. The upper and lower feed inlets have the functions that: the device is used for mixing the materials in the whole low-temperature storage tank 14, so that the temperature and the density of the materials are uniformly distributed, and layering and material rolling (boiling) are avoided.
The tail end of the second pipeline 7 is connected to a discharge port of the low-temperature storage tank 14 through a valve Q; the tail ends of the first pipeline 6 and the second pipeline 7 are mutually communicated through a valve H, and the valve H is arranged at the front ends of a feed inlet and a discharge outlet of the low-temperature storage tank 14. The tail end of the first pipeline 6 is connected with a start-up pipeline through a valve K, a start-up spraying ring 13 is arranged at the tail end of the start-up pipeline, and the start-up spraying ring 13 is positioned at the inner top of the low-temperature storage tank 14; after the material enters the tank, atomized tiny liquid beads are sprayed out through a start-up spraying ring 13, and then the vaporization absorption heat is precooled for a low-temperature storage tank 14.
A BOG main pipe 16 is arranged on the low-temperature storage tank 14, the BOG main pipe 16 is connected to a reliquefaction system 17 and a flare system 18, and a sampling port 19 is arranged on the BOG main pipe 16; the liquid outlet of the reliquefaction system 17 is divided into two paths, one path is connected to the upper feed inlet 12 of the low-temperature storage tank 14, and the other path is connected to the start-up pipeline; the second pipeline 7 is communicated with the starting pipeline through a valve M. The ethane sprayed from the start-up spraying ring 13 is discharged out of the low-temperature storage tank 14 through the BOG main pipe 16 after being vaporized, and BOG gas is discharged to the torch system 18 before the BOG discharge temperature does not reach the starting condition of the reliquefaction system 17; when the BOG discharge temperature reaches the start condition of the reliquefaction system 17, the BOG gas enters the reliquefaction system 17, and the ethane liquid liquefied in the reliquefaction system 17 returns to the low-temperature storage tank 14 from the upper feed inlet 12 through the valve L.
An in-tank pump 15 is arranged in the low-temperature storage tank 14, an outlet pipeline of the in-tank pump 15 is connected to a discharge port of the low-temperature storage tank 14, the discharge port is connected with the pipeline II 7 through a valve Q, and the discharge port is connected with a downstream device 20 through a valve R. The feeding of the low-temperature storage tank 14 is divided into two paths by an in-tank pump 15 and is outwards sent out, one path flows to the wharf side through a pipeline II 7, and returns to the low-temperature storage tank 14 from the wharf side through a pipeline I6; one path is directed to downstream device 20.
The liquid nitrogen injection device 8 comprises a liquid nitrogen tank car or a liquid nitrogen storage tank for supplying liquid nitrogen and a liquid nitrogen injection pipeline 9 connected with the liquid nitrogen tank car or the liquid nitrogen storage tank, the liquid nitrogen injection device 8 has a pressurizing and conveying function and a temperature adjusting function, and a flow instrument, a temperature instrument, a pressure instrument and a valve G are arranged on the liquid nitrogen injection pipeline 9.
The lengths of the first pipeline 6 and the second pipeline 7 are both larger than 2km, the distance between the first nitrogen injection port 10 and the low-temperature nitrogen supply device 4 is 2-3 km, and the distance between any two nitrogen injection ports 10 is 2-3 km.
A method for starting a receiving system of a long-distance large-diameter pipeline, which mainly comprises the following steps:
the two low-temperature nitrogen supply devices 4 are respectively connected with the two loading and unloading arms 5, and the low-temperature nitrogen supply devices 4 have a pressurizing and conveying function and a temperature adjusting function and continuously input low-temperature nitrogen into the first pipeline 6 and the second pipeline 7. And (3) using low-temperature nitrogen as power, blowing off and vaporizing the liquid nitrogen input by the nitrogen injection port 10 on the first pipeline 6, and continuously supplementing cold into the first pipeline 6 until the precooling is completed.
After the precooling of the first pipeline 6 and the second pipeline 7 is finished, the valve F and the valve F' between the low-temperature nitrogen supply device 4 and the second pipeline 7 are closed, the low-temperature nitrogen is stopped to be introduced into the second pipeline 7, the valve C is opened, and gas-phase ethane is started to be introduced into the second pipeline 7 for real-gas replacement until the ethane content at the tail end of the second pipeline 7 is more than 99%. The gaseous ethane enters the cryogenic storage tank 14 through upper and lower feed ports, and ethane gas within the cryogenic storage tank 14 is vented to the flare system 18 through the BOG header 16.
After the second pipeline 7 is subjected to the solid gas replacement, the low-temperature nitrogen supply device 4 stops inputting the low-temperature nitrogen of the first pipeline 6 and spraying the liquid nitrogen into the nitrogen injection port 10 on the first pipeline 6, and then the nitrogen injection port 10 is plugged immediately (the plugging is completed within 1 hour to ensure that the low-temperature solid gas replacement is performed as soon as possible and prevent the pipeline from returning to temperature). After the sealing of the nitrogen injection port 10 of the pipeline I6 is finished, the pipeline I6 is subjected to the actual gas replacement operation; meanwhile, the second pipeline 7 starts to carry out liquid filling operation, liquid-phase ethane enters the second pipeline 7 through the valve C', the liquid-phase ethane in the second pipeline 7 is sprayed into the low-temperature storage tank 14 through the start-up spraying ring 13, and the tank body is cooled.
After the solid gas replacement of the first pipeline 6 is completed, filling liquid is carried out on the first pipeline 6, gas-phase ethane in the first pipeline 6 enters the low-temperature storage tank 14 through the upper feed inlet 12, and when the whole first pipeline 6 is nearly completed in filling liquid, the valve J is quickly closed before the liquid-phase ethane passes over the upper feed valve J; the flow is changed to feed through the start-up spray ring 13, and at the moment, the liquid-phase ethane in the first pipeline 6 and the second pipeline 7 enter the low-temperature storage tank 14 through the start-up spray ring 13.
When the BOG temperature in the cryogenic storage tank 14 reaches the start-up condition of the re-liquefaction system 17, the re-liquefaction system 17 is started, and liquefied ethane also enters the cryogenic storage tank 14 through the start-up spray ring 13.
When the whole low-temperature storage tank 14 is pre-cooled to-88 ℃ (the boiling point temperature of ethane), a certain liquid level is established in the low-temperature storage tank 14, and then the material can be fed through the lower feed inlet 11 until the complete unloading of the ethane ship is completed.
As shown in fig. 8, after the unloading is completed, the whole receiving system is started up. The receiving system can be switched into a cold circulation mode, and when in circulation, the valve A ', the valve D and the valve D' are all closed; the valve B, the valve B ', the valve C', the valve E ', the valve F and the valve F' are all opened, the cold energy in the low-temperature storage tank 14 enters the pipeline II 7 through the valve Q, then reaches the wharf side through the pipeline II 7, enters the pipeline I6, and then returns to the low-temperature storage tank 14 through the upper feed inlet and the lower feed inlet through the pipeline I6, and the circulation is performed in such a way, so that the whole receiving system is kept in a cold state, and the cold energy can be started for feeding at any time.
The above embodiments are only for illustrating the present invention, not for limiting the present invention, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the spirit and scope of the present invention, and therefore, all equivalent technical solutions are also within the scope of the present invention, and the scope of the present invention is defined by the claims.

Claims (6)

1. A receiving system for long-distance large-diameter pipelines, which is characterized in that: the receiving system comprises a wharf side, a long-distance conveying pipeline and a tank area side; the dock side comprises more than two berths, wherein at least one berth is connected with the material conveying device, and at least one berth is connected with the low-temperature nitrogen supply device; the long-distance conveying pipeline comprises a pipeline I and a pipeline II, wherein the pipeline I is a large-pipe-diameter pipeline which is more than or equal to DN800 and is used for conveying materials; the second pipeline is a small-pipe-diameter pipeline which is less than or equal to DN300 and is used for circulating cold energy; the first pipeline and the second pipeline are respectively connected with the material conveying device and the low-temperature nitrogen supply device; the pipeline I and the pipeline II are arranged in parallel, at least one nitrogen injection port is arranged on the pipeline I, and each nitrogen injection port is connected with a liquid nitrogen injection device; the tank farm side comprises a low-temperature storage tank, a torch system and a reliquefaction system, and the tail ends of the first pipeline and the second pipeline are connected to the low-temperature storage tank;
The material conveying device is arranged at the foremost berth and comprises a gas phase output port and a liquid phase output port; the low-temperature nitrogen supply device is arranged at a berth at the rear end of the material conveying device; two loading and unloading arms are arranged on each berth;
The head ends of the first pipeline and the second pipeline are communicated with each other through a valve; the tail end of the first pipeline is connected to the feed inlet of the low-temperature storage tank through a valve, and the tail end of the second pipeline is connected to the discharge outlet of the low-temperature storage tank through a valve; the tail ends of the first pipeline and the second pipeline are communicated with each other through a valve H, and the valve H is arranged at the front ends of the feed inlet and the discharge outlet of the low-temperature storage tank;
the feeding port of the low-temperature storage tank comprises an upper feeding port and a lower feeding port, a valve J is arranged on the upper feeding port, and the upper feeding port extends into the upper part of the low-temperature storage tank through an upper feeding pipe; the lower feed inlet is provided with a valve I, and extends into the lower part of the low-temperature storage tank through a lower feed pipe; the tail end of the first pipeline is connected with a startup pipeline through a valve, a startup spraying ring is arranged at the tail end of the startup pipeline, and the startup spraying ring is positioned at the inner top of the low-temperature storage tank.
2. The system for receiving long-distance large-diameter pipes according to claim 1, wherein: a BOG main pipe is arranged on the low-temperature storage tank and connected to the reliquefaction system and the torch system, and a sampling port is arranged on the BOG main pipe; the liquid outlet of the reliquefaction system is divided into two paths, one path is connected to the upper feed inlet of the low-temperature storage tank, and the other path is connected to the start-up pipeline; and the second pipeline is communicated with the starting pipeline through a valve.
3. The system for receiving long-distance large-diameter pipes according to claim 1, wherein: an in-tank pump is arranged in the low-temperature storage tank, an outlet pipeline of the in-tank pump is connected to a discharge port of the low-temperature storage tank, the discharge port is connected with a pipeline II through a valve Q, and the discharge port is connected with a downstream device through a valve R.
4. The system for receiving long-distance large-diameter pipes according to claim 1, wherein: the liquid nitrogen injection device comprises a liquid nitrogen tank car or a liquid nitrogen storage tank for supplying liquid nitrogen and a liquid nitrogen injection pipeline connected with the liquid nitrogen tank car or the liquid nitrogen storage tank, the liquid nitrogen injection device has a pressurizing and conveying function and a temperature adjusting function, and a flow instrument, a temperature instrument, a pressure instrument and a valve G are arranged on the liquid nitrogen injection pipeline.
5. The system for receiving long-distance large-diameter pipes according to claim 1, wherein: the lengths of the first pipeline and the second pipeline are both larger than 2km, the distance between the first nitrogen injection port and the low-temperature nitrogen supply device is 2-3 km, and the distance between any two nitrogen injection ports is 2-3 km.
6. A method of starting up a receiving system for long-distance large-diameter pipes according to any one of claims 1 to 5, characterized in that the method of starting up mainly comprises the following:
1) Precooling the first pipeline and the second pipeline by liquid nitrogen, and keeping a cold state;
2) The second pipeline is subjected to solid gas replacement and liquid filling, and precooling is carried out on the low-temperature storage tank through a start-up spray ring;
3) Carrying out solid gas replacement and liquid filling on the first pipeline at the same time of liquid filling of the second pipeline in the step 2);
4) After the first pipeline and the second pipeline are full of liquid, the first pipeline and the second pipeline enter a start-up spraying ring at the same time, the low-temperature storage tank is pre-cooled, and the re-liquefying system is started in time according to the start-up condition of the re-liquefying system;
5) After the low-temperature storage tank is precooled and a certain liquid level is established, large-flow liquid inlet can be carried out, the start-up spraying ring is stopped, and the liquid inlet of the lower feed inlet is started.
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