CN107699305A - Vertical liquefied natural gas after-condenser - Google Patents

Vertical liquefied natural gas after-condenser Download PDF

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Publication number
CN107699305A
CN107699305A CN201711004717.3A CN201711004717A CN107699305A CN 107699305 A CN107699305 A CN 107699305A CN 201711004717 A CN201711004717 A CN 201711004717A CN 107699305 A CN107699305 A CN 107699305A
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China
Prior art keywords
lng
inner barrel
filler
cylinder body
outer cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201711004717.3A
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Chinese (zh)
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CN107699305B (en
Inventor
王以斌
常征
姚建军
丁梅峰
王文昊
郭维军
李战杰
何龙辉
王惠勤
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.)
Sinopec Engineering Group Co Ltd
Sinopec Guangzhou Engineering Co Ltd
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Sinopec Engineering Group Co Ltd
Sinopec Guangzhou Engineering Co Ltd
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Priority to CN201711004717.3A priority Critical patent/CN107699305B/en
Publication of CN107699305A publication Critical patent/CN107699305A/en
Application granted granted Critical
Publication of CN107699305B publication Critical patent/CN107699305B/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/06—Heat exchange, direct or indirect
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/56—Specific details of the apparatus for preparation or upgrading of a fuel

Abstract

The invention discloses a kind of vertical liquefied natural gas after-condenser, is mainly made up of vertical outer cylinder body of the both ends with end socket, LNG jet trays, LNG reallocation plate, inner barrel and filler；LNG jet trays, LNG reallocation plates and inner barrel are coaxially disposed with outer cylinder body from top to bottom, and LNG jet trays are below the end socket of outer cylinder body top on the outer cylinder body inwall of top end socket；LNG reallocation plates leave therebetween gap below LNG jet trays；Inner barrel forms bottom lock, the annular space of opened upper end on the end socket of outer cylinder body bottom between outer cylinder body inwall and inner barrel outer wall, filler is provided with less than the position on edge on inner barrel on the top of annular space；The present invention uses single tank double shell type structure, and inner barrel space is spiral condensation space, and the annular space top between inner barrel and outer cylinder body is filler condensation space, and two condensation processes largely improve the condensation efficiency of after-condenser.

Description

Vertical liquefied natural gas after-condenser
Technical field
The invention belongs to liquefied natural gas (LNG) processing technology field, a kind of vertical liquefied natural gas is related in particular to (LNG) after-condenser.
Background technology
Liquefied natural gas receiving station is the terminal link in LNG industry chain, is received from LNG ship liquefied natural gas and through storage Deposit, regasify after be conveyed to downstream user, due to the operating of pump, environment leakage heat and unload the displacement of ship time in receiving station's system Effect, equipment pipe cold insulation etc. can all cause the liquefied natural gas gasifying under extremely low temperature (- 162 DEG C) to produce boil-off gas (BOG).
LNG receiving stations BOG recovery processing techniques mainly include directly compression it is outer it is defeated with LNG is condensed into by after-condenser after Pressurization, gasification are simultaneously outer defeated, and the directly outer defeated technique of compression needs defeated pipe network outside the supporting low-voltage customer in downstream or low pressure, and domestic Defeated pipe network is generally high pressure pipe network and lacks related supporting industry outside the downstream of LNG receiving stations, therefore all using condensing work again Skill handles BOG gases, and foreign countries are also frequently with this technique.
For LNG boil-off gas using when condensing recovery process again, after-condenser is the capital equipment in process system, is entirely being connect Receive in the operation of station and play the central role taken over from the past and set a new course for the future, its major function is mainly that BOG and LNG provide enough times of contact Promote BOG to be condensed into LNG with space and ensure the inlet pressure of high-pressure pump as the inlet buffer of LNG high-pressure pumps.Again The structure of condenser mainly has bivalve two kinds of structures of double tanks and monoshell list tank, and the after-condenser of KOGAS companies is using double The double jar structures of shell, inner canister is isolated with the top of outer tank, bottom communicates, and Jiangsu Coastal LNG receiving stations of CNOOC use single tank monoshell Structure, packed art is both employed, the difference in terms of operation is mainly reflected in the difference of control mode, double tank double shell types The Stress control of after-condenser is carried out mainly by the BOG pressure of annular space, single each technological parameter of tank single shell structure Stress control Influence each other larger.
The outer ring space of double tank duplex shell structures is only used for the Stress control of after-condenser, wastes space in tank, increase Floor space, relative reduction condensation efficiency again；Single tank single shell structure is all entered together due to all BOG through pipeline all the way One space participates in condensation, therefore causes larger difficulty to control.
The content of the invention
The technical problems such as condensation efficiency is low again, Stress control is difficult in order to solve boil-off gas existing for prior art, this hair It is bright to provide a kind of vertical liquefied natural gas after-condenser.
Vertical liquefied natural gas after-condenser provided by the invention is mainly carried vertical outer cylinder body, the LNG of end socket by both ends Jet tray, LNG reallocation plate, inner barrel and filler composition；LNG jet trays, LNG reallocation plates and inner barrel are located at outer cylinder body It is interior, it is coaxially disposed from top to bottom with outer cylinder body, LNG jet trays are below the end socket of outer cylinder body top close to the outer barrel of top end socket On internal wall；LNG reallocation plates leave therebetween gap below LNG jet trays；Inner barrel seals located at outer cylinder body bottom On head, bottom lock, the annular space of opened upper end are formed between outer cylinder body inwall and inner barrel outer wall, in the upper of annular space Portion is provided with filler less than the position on edge on inner barrel；LNG jet trays superjacent air space forms LNG cushion spaces, and LNG reallocates under plate Side, the space above filler form gas-liquid mixed space, and the annular space below filler forms liquid Space；Outer cylinder body top is sealed Head center is provided with LNG entrances, and outer cylinder body bottom end socket center is provided with the bottom BOG entrances communicated with inner barrel, and gas-liquid mixed is empty Between side wall be provided with top BOG entrances, annular space bottom outer barrel body sidewall exports provided with LNG.
Described LNG jet trays are the plectane for being covered with injection circular hole, and injection circular hole is in arranged in concentric circles, on each circle Circular hole equal circumference angle arrangement is sprayed, 5~10 times of injection Circularhole diameter is spaced between adjacent circle, concentric ring should be greater than 4 circles, with LNG jet trays uniform jeting effect formed below.LNG jet trays center receives rushing for LNG entrance incoming LNG Hit, be not provided with spraying circular hole.
Described LNG reallocation plates are the plectane for being covered with distribution circular hole, and distribution circular hole sets in equilateral triangle, is uniformly covered with Whole plate face.Distribution Circularhole diameter should be 2~3 times of injection Circularhole diameter, to form good uniform effect, LNG reallocation The percent opening of plate should be big as far as possible, typically more suitable 60%~70%.LNG reallocation plates receive LNG jet tray jets And the LNG come carries out secondary reallocation to form more uniform spraying effect.
For described filler by filler bottom plate and filler top plate supporting and fixation, filler bottom plate is identical with filler top board structure, It is annular plate, round hole is uniformly provided with ring-type plate face, round hole is arranged in equilateral triangle, full of whole annular plate Face.Filler bottom plate is set on inner barrel outer wall with filler top plate, and filler is filled in the ring between filler bottom plate and filler top plate In shape space.The percent opening of filler bottom plate and filler top plate should be as big as possible, prevents from causing the current of liquid-vapor mixture to be obstructed；Fill out Material bottom plate is used for supporting filler, and perforate size is less than used filler size, it is impossible to causes filler to reveal, filler is according to setting Meter requires all may be used using Pall ring, Raschig ring or structured packing.
In order to improve condensation efficiency, BOG stabiliers, BOG current stabilizations are provided with the inner barrel inwall close to bottom BOG entrances Plate is the Circular plate structure for being uniformly covered with circular hole, and the perforate of BOG stabiliers is arranged in equilateral triangle.BOG stabiliers mainly receive to come Flow BOG impact and evenly distributed, incoming LNG big air mass is separated into small air mass, increases BOG and LNG contact surface Product, improve the efficiency condensed again.
In order to further improve condensation effect, spiral blade is provided with interior inner barrel, spiral blade is by spiral shell Vane piece is formed around central shaft spiral, and the diameter of spiral blade is identical with inner barrel internal diameter, spiral blade Outer rim mutually welded with inner barrel inwall, interior inner barrel formed spiral runner, inner barrel inner space is spiral Condensation space.
Bottom BOG entrance incoming BOG are under buoyancy through spiral runner spiral to gas-liquid mixed space；Spiral shell The main control parameters for screwing on liter blade are lead angle, and lead angle is excessive, and the BOG rates of climb are too fast and cause certain Setting height(from bottom) on spiral number of turns it is very few so that a condensation time it is very few so as to condensation effect it is bad, lead angle is too small, makes The too small i.e. BOG of spiral blade pitgh helical duct it is narrow, circulation area not enough and the LNG amounts that are contacted with BOG not Foot equally influences a condensation effect.The 45~55% of a diameter of outer cylinder body diameter of general control inner barrel, lead angle is at 15 ° Between~20 °.If being provided with BOG stabiliers in inner barrel, spiral blade should be arranged on above BOG stabiliers.
The general principle of the present invention is that incoming LNG first enters LNG cushion spaces through LNG entrances, through LNG jet tray jets Carry out uniform cloth liquid through LNG reallocation plates again afterwards；BOG enters through compressor to flow through bottom BOG entrances with top BOG entrances After-condenser；Top BOG entrance incomings BOG is directly entered gas-liquid mixed space；The BOG that bottom BOG entrances enter is through inner barrel The up remaining BOG after spiral condensation space carries out the condensation recovery of first time of spiral enters gas-liquid mixed space, now interior Liquid level in cylinder is in overflow situation；The BOG in gas-liquid mixed space and the LNG progress reallocated through LNG under the uniform spray of plate Filler condensation space, which is advanced into, under fully after contact mixing carries out secondary condensation recovery；By having been condensed after time condensation Into LNG enter annular LNG liquid Spaces, flow to the LNG high pressure output pumps in downstream through LNG outlets.
It is an advantage of the invention that proposing a kind of single tank double shell type structure of after-condenser, inner barrel space condenses for spiral Space, the annular space top between inner barrel and outer cylinder body is filler condensation space, and two condensation processes are largely Improve the condensation efficiency of after-condenser；Gas phase entrance is divided into bottom BOG entrances and top BOG entrances, be one kind than double tanks Double shell type is more efficient, the process structure more easily controlled than single tank monoshell type.
Brief description of the drawings
Fig. 1 is the structural representation of the vertical liquefied natural gas after-condenser of the present invention；
Fig. 2 is the structural representation of spiral blade in Fig. 1；
Fig. 3 is the structural representation of BOG stabiliers in Fig. 1；
Fig. 4 is the structural representation of LNG jet trays in Fig. 1；
Fig. 5 is the structural representation of LNG reallocation plate in Fig. 1；
Fig. 6 is the structural representation of filler bottom plate in Fig. 1.
In figure：1- outer cylinder bodies, 2-LNG entrances, 3- bottoms BOG entrances, 4- tops BOG entrances, 5-LNG outlets, 6-LNG sprays Penetrate plate, 7-LNG reallocation plates, 8- filler top plates, 9- filler bottom plates, 10- inner barrels, 11- spiral blades, 12-BOG current stabilizations Plate, 13- spiral condensation spaces, 14- gas-liquid mixeds space, 15-LNG cushion spaces, 16- fillers, 17- liquid Spaces, 18- spirals Blade, 19- central shafts.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
Referring to Fig. 1~6, vertical liquefied natural gas after-condenser provided by the invention is mainly vertical with end socket by both ends Outer cylinder body 1, LNG jet trays 6, LNG reallocation plate 7, inner barrel 10 and filler 16 form；LNG jet trays 6, LNG reallocation plates 7 With inner barrel 10 in outer cylinder body 1, it is coaxially disposed from top to bottom with outer cylinder body, LNG jet trays 6 seal located at outer cylinder body top Head lower section is on the outer cylinder body inwall of top end socket；LNG reallocation plates 7 leave therebetween located at the lower section of LNG jet trays 6 Gap；Inner barrel 10 formed on the bottom end socket of outer cylinder body 1, between the inwall of outer cylinder body 1 and the outer wall of inner barrel 10 bottom lock, The annular space of opened upper end, filler 16 is provided with less than the position on edge on inner barrel 10 on the top of annular space；LNG jet trays 6 superjacent air spaces form LNG cushion spaces 15, and the lower section of LNG reallocation plate 7, the space of the top of filler 16 form gas-liquid mixed space 14, the annular space of the lower section of filler 16 forms liquid Space 17；The top end socket center of outer cylinder body 1 is provided with LNG entrances 2, outer cylinder body 1 Bottom end socket center is provided with the bottom BOG entrances 3 communicated with inner barrel 10, and the side wall in gas-liquid mixed space 14 is provided with top BOG entrances 4, annular space bottom outer barrel body sidewall are provided with LNG outlets 5.
Be provided with BOG stabiliers 12 on the inner barrel inwall close to bottom BOG entrances 3, above the BOG stabiliers 12 in Cylinder inboard wall is provided with spiral blade 11, and spiral blade 11 surrounds the spiral shape of central shaft 19 by helical blade 18 Into.
The present invention the course of work be：Incoming LNG first enters LNG cushion spaces through the LNG entrances 2 at the top of after-condenser 15, through carrying out uniform cloth liquid through LNG reallocation plates 7 again after the jet of LNG jet trays 6；BOG flows through bottom BOG through compressor Entrance 3 enters after-condenser with top BOG entrances 4；The incoming BOG of top BOG entrances 4 is directly entered gas-liquid mixed space 14；Bottom The BOG that portion's BOG entrances 3 enter is up after spiral condensation space 13 carries out the condensation recovery of first time through the spiral of inner barrel 10 Remaining BOG enters gas-liquid mixed space 14, and now the liquid level in inner barrel 10 is in overflow situation；Gas-liquid mixed space 14 BOG with through LNG reallocation plate 7 uniformly the lower LNG of spray fully contact mix after under be advanced into the progress of filler 16 for the second time Condensation recovery；Enter annular liquid Space 17 by condensing the LNG completed after time condensation, downstream is flowed to through LNG outlets 5 LNG high pressure output pumps.

Claims (13)

  1. A kind of 1. vertical liquefied natural gas after-condenser, it is characterised in that：Mainly by both ends with end socket vertical outer cylinder body, LNG jet trays, LNG reallocation plate, inner barrel and filler composition；LNG jet trays, LNG reallocation plates and inner barrel are located at outer In cylinder, it is coaxially disposed from top to bottom with outer cylinder body, LNG jet trays are below the end socket of outer cylinder body top close to top end socket On outer cylinder body inwall；LNG reallocation plates leave therebetween gap below LNG jet trays；Inner barrel is located at outer cylinder body bottom On end seal head, bottom lock, the annular space of opened upper end are formed between outer cylinder body inwall and inner barrel outer wall, in annular space Top be provided with filler less than the position on edge on inner barrel；LNG jet trays superjacent air space forms LNG cushion spaces, LNG reallocation Space below plate, above filler forms gas-liquid mixed space, and the annular space below filler forms liquid Space；Outer cylinder body top End seal head center is provided with LNG entrances, and outer cylinder body bottom end socket center is provided with the bottom BOG entrances communicated with inner barrel, and gas-liquid is mixed The side wall for closing space is provided with top BOG entrances, and annular space bottom outer barrel body sidewall exports provided with LNG.
  2. 2. after-condenser according to claim 1, it is characterised in that：Described LNG jet trays are to be covered with injection circular hole Plectane, injection circular hole be in arranged in concentric circles, and the injection circular hole equal circumference angle on each circle is arranged, between adjacent circle between Every 5~10 times of injection Circularhole diameter, LNG jet trays center is not provided with spraying circular hole.
  3. 3. after-condenser according to claim 2, it is characterised in that：Described LNG reallocation plates are to be covered with distribution circular hole Plectane, distribution circular hole in equilateral triangle setting, be uniformly covered with whole plate face.
  4. 4. after-condenser according to claim 3, it is characterised in that：The injection that described distribution Circularhole diameter is 2~3 times Circularhole diameter.
  5. 5. the after-condenser according to claim 3 or 4, it is characterised in that：The percent opening of described LNG reallocation plate is 60%~70%.
  6. 6. after-condenser according to claim 1, it is characterised in that：Described filler is by filler bottom plate and filler top plate branch Supportting and fixed, filler bottom plate is identical with filler top board structure, is annular plate, round hole is uniformly provided with ring-type plate face, Round hole is arranged in equilateral triangle, and full of whole ring-type plate face, filler bottom plate is set on inner barrel outer wall with filler top plate, Filler is filled in the annular space between filler bottom plate and filler top plate.
  7. 7. after-condenser according to claim 1, it is characterised in that：Described filler is Pall ring, Raschig ring or rule Whole filler.
  8. 8. after-condenser according to claim 1, it is characterised in that：The inner barrel inwall of the close bottom BOG entrances BOG stabiliers are provided with, BOG stabiliers are the Circular plate structure for being uniformly covered with circular hole, and the perforate of BOG stabiliers is in equilateral triangle cloth Put.
  9. 9. after-condenser according to claim 1, it is characterised in that：Spiral leaf is provided with inside described inner barrel Piece, spiral blade is formed by helical blade around central shaft spiral, in the diameter and inner barrel of spiral blade Footpath is identical, and outer rim and the inner barrel inwall of spiral blade mutually weld, and spiral runner is formed in interior inner barrel.
  10. 10. after-condenser according to claim 9, it is characterised in that：The lead angle of described spiral blade is 15 °~20 °.
  11. 11. after-condenser according to claim 1, it is characterised in that：The a diameter of outer cylinder body diameter of described inner barrel 45~55%.
  12. 12. after-condenser according to claim 8, it is characterised in that：Inner barrel inwall above described BOG stabiliers It is provided with spiral blade.
  13. 13. after-condenser according to claim 12, it is characterised in that：The a diameter of outer cylinder body diameter of described inner barrel 45~55%, the lead angle of spiral blade is 15 °~20 °.
CN201711004717.3A 2017-10-25 2017-10-25 Vertical liquefied natural gas recondenser Active CN107699305B (en)

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CN107699305B CN107699305B (en) 2020-02-14

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110194978A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal tank body LNG condensing unit again
CN110194977A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal LNG condensing unit again
CN110194975A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal tank body LNG after-condenser
CN110193300A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of LNG after-condenser gas-liquid mixed uniform device
CN110194976A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal LNG after-condenser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202082623U (en) * 2011-05-19 2011-12-21 中国寰球工程公司 Aftercondenser control system
CN103691234A (en) * 2013-12-17 2014-04-02 成都展望能源机械有限公司 Filler-type natural gas washing tank
KR101564904B1 (en) * 2014-06-05 2015-11-02 삼성중공업 주식회사 Recondenser including baffle structure with regasification prevention function
CN205002454U (en) * 2015-07-24 2016-01-27 西安华江环保科技股份有限公司 Vapour and liquid separator for LNG refrigerating system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202082623U (en) * 2011-05-19 2011-12-21 中国寰球工程公司 Aftercondenser control system
CN103691234A (en) * 2013-12-17 2014-04-02 成都展望能源机械有限公司 Filler-type natural gas washing tank
KR101564904B1 (en) * 2014-06-05 2015-11-02 삼성중공업 주식회사 Recondenser including baffle structure with regasification prevention function
CN205002454U (en) * 2015-07-24 2016-01-27 西安华江环保科技股份有限公司 Vapour and liquid separator for LNG refrigerating system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110194978A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal tank body LNG condensing unit again
CN110194977A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal LNG condensing unit again
CN110194975A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal tank body LNG after-condenser
CN110193300A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of LNG after-condenser gas-liquid mixed uniform device
CN110194976A (en) * 2018-02-27 2019-09-03 中石化广州工程有限公司 A kind of horizontal LNG after-condenser
CN110194975B (en) * 2018-02-27 2021-05-04 中石化广州工程有限公司 Horizontal tank LNG recondenser
CN110194976B (en) * 2018-02-27 2021-06-08 中石化广州工程有限公司 Horizontal LNG recondenser

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