CN104482395B - A kind of method of BOG while utilizing LNG cold energy to reclaim tank car entrucking - Google Patents
A kind of method of BOG while utilizing LNG cold energy to reclaim tank car entrucking Download PDFInfo
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- CN104482395B CN104482395B CN201410621180.5A CN201410621180A CN104482395B CN 104482395 B CN104482395 B CN 104482395B CN 201410621180 A CN201410621180 A CN 201410621180A CN 104482395 B CN104482395 B CN 104482395B
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Abstract
While the present invention relates to a kind of LNG of utilization cold energy recovery tank car entrucking, the method for BOG, comprises the following steps: 1) before the entrucking of LNG tank car, carry out release to 0.5MPaG; 2) when entrucking starts, only open the liquid flowing valve at LNG tank car top, then pass into LNG by liquid flowing valve, LNG enters in car tank, by the spray pipe of LNG tank car inner top, LNG tank car is carried out coolingly, make portion gas again be liquefied as LNG, pass into 2T left and right and complete precooling, and then open the valve of LNG tank car bottom, fill LNG; 3) entrucking process initial stage pressure rise 0.1MPa～0.2MPa, along with the increase of LNG filling weight, tank car pressure can transfer decline to, and after entrucking, the pressure stability in LNG tank car is in 0.15MPa. The present invention can utilize the cold in cold LNG to carry out condensation and reclaim BOG, just can reduce the generation of the BOG of LNG receiving station, reduce the BOG of receiving station disposal cost, and entrucking was more accurate.
Description
Technical field
A kind of method of BOG while the present invention relates to the LNG of utilization cold energy recovery tank car entrucking.
Background technology
LNG is as a kind of clean energy resource just in large scale investment market application, and the storage temperature of LNG is-162 DEG C. According to design, before the entrucking of LNG tank car, first tank car is carried out to release, from 0.1～0.5MPaGUnload to 0.15MPaG, the BOG producing when original and entrucking in tank car is all discharged into receiving stationBOG header, when entrucking operation, a little higher than BOG header of pressure pressure, is about 0.02～0.03MPaG,Entrucking finishes pit interior pressure and is about 0.04MPaG. And the LNG temperature that enters tank car when entrucking is-156 DEG C, pressure is 0.7MPaG, and LNG now, in supercooled state, has unnecessary cold can supply profitWith. According to the loading method of design, the step-down and having slatterned during just along with entrucking of this part cold. If sharpCarry out condensation with this part cold and reclaim BOG, just can reduce the generation of the BOG of LNG receiving station. And tank car LNGThe design operation pressure of storage tank is 0.75MPaG, if the pressure of tank car storage tank while suitably improving entrucking, with regard to energyEnough utilize this part cold energy condensation recovery section or whole BOG.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of utilization that reduces the BOG of receiving station disposal costThe method of BOG when LNG cold energy reclaims tank car entrucking.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: one utilizes LNG cold energy to reclaim tank carThe method of BOG when entrucking, comprises the following steps:
1) before the entrucking of LNG tank car, pressure is 0.1～0.5MPaG, if pressure is greater than 0.5MpaG, opensValve on BOG gas phase return arm unloads and is depressed into below 0.5MPaG;
2) when entrucking starts, only open the liquid flowing valve at LNG tank car top, then pass through liquid flowing valveTo be less than 12m3The flow of/h passes into LNG, and LNG enters in tank car tank, by LNG tank car inner topSpray pipe carries out cooling to LNG tank car, make portion gas again be liquefied as LNG, passes into 2～3 tons of left sidesThe right side completes precooling, and then opens the valve of LNG tank car bottom, and LNG is filled;
3) entrucking process initial stage pressure rise 0.1MPa～0.2MPa, along with the increase of LNG filling weight,LNG tank car internal pressure can transfer decline to, and after entrucking, the pressure stability in LNG tank car is at 0.15MPaBelow;
Above-mentioned loading method is to utilize the cold in cold LNG to carry out condensation recovery BOG, concrete theoretical calculatingFormula is as follows:
A) before the entrucking of LNG tank car, pressure is 0.1～0.5MPaG, calculates the cold of crossing of LNG,
The cold of crossing of feed liquor LNG calculates by formula (1):
E1＝M1×(H2-H1)×1.055056×2204.62＝1587493kJ，(1)
In formula (1):
E1Represent the cold (kJ) excessively that feed liquor LNG has,
M1Represent the quality (t) of feed liquor LNG,
H1Represent that LNG pressure before entrucking is 0.1～0.5MPaG, the feed liquor temperature enthalpy while being-156 DEG C(Btu/lb)，
H2Represent that LNG pressure before entrucking is the enthalpy (Btu/lb) under 0.1～0.5MPaG, saturation temperature;
In LNG tank car, the required cold of the whole condensations of BOG calculates by formula (2):
E2＝M2×(H3-H1)×1.055056×2204.62＝157516.7kJ，
In formula (2):
E2Represent the cold (kJ) that the whole condensations of BOG are required,
M2Represent the quality (t) of BOG in LNG tank car,
H3Represent that BOG pressure before entrucking is enthalpy when temperature is-112 DEG C before 0.1～0.5MPaG, entrucking(Btu/lb)；
B) before entrucking, do not discharge BOG, the final pressure P reaching in LNG tank car after calculating entrucking2, rootAccording to the first law of thermodynamics, calculate the required cold enthalpy difference of mistake of feed liquor LNG, formula is as follows:
ΔH＝0.00042992×E2/M3＝3.53Btu/lb，(3)
In formula (3):
Δ H represents the cold enthalpy difference of the required mistake of feed liquor LNG (Btu/lb),
M3Represent feed liquor LNG amount (t).
The invention has the beneficial effects as follows:
Loading method of the present invention can utilize the cold in cold LNG to carry out condensation and reclaim BOG, just can reduce LNGThe generation of the BOG of receiving station, reduce the BOG of receiving station disposal cost, and entrucking is more accurate, reduces simultaneouslyUnload unload pressurization time and the expense at station, reduced start-stop time and the time of BOG reclaimer,Play attenuating equipment cost, minimizing equipment power consumption etc.
On the basis of technique scheme, the present invention can also do following improvement.
Further, in step 2) in, the speed that passes into LNG by liquid flowing valve is 150kg/min
Further, in step 2) in, the time that completes precooling is 10～20 minutes.
Further, in step 2) in, the flow that LNG is filled is 50～70 cubes ms/h.
Brief description of the drawings
Fig. 1 is the P-H phasor of methane of the present invention;
Fig. 2 is LNG tank car internal structure of the present invention and truck fill flow schematic diagram figure;
Pressure when Fig. 3 is LNG tank car entrucking of the present invention changes schematic diagram figure;
In accompanying drawing, the list of parts of each label representative is as follows:
1, valve, 2, BOG gas phase return arm, 3, LNG liquid phase liquid feeding arm, 4, spray pipe.
Detailed description of the invention
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example is only for explaining thisInvention, is not intended to limit scope of the present invention.
A method of BOG while utilizing LNG cold energy to reclaim tank car entrucking, comprises the following steps:
1) before the entrucking of LNG tank car, pressure is 0.1～0.5MPaG, if pressure is greater than 0.5MpaG, opensValve on BOG gas phase return arm unloads and is depressed into below 0.5MPaG;
2) when entrucking starts, only open the liquid flowing valve at LNG tank car top, then pass through liquid flowing valveTo be less than 12m3The flow of/h passes into LNG, and LNG enters in car tank, by the spray of LNG tank car inner topShower pipe line 4 carries out cooling to LNG tank car, make portion gas again be liquefied as LNG, passes into 2～3 tons of left sidesThe right side completes precooling, and then opens the valve of LNG tank car bottom, for improving entrucking speed, passes through LNGLiquid phase liquid feeding arm 3 passes into LNG entrucking with the large flow of 50～70 cubes ms/h;
3) entrucking process initial stage pressure rise 0.1MPa～0.2MPa, but still lower than tank body safety valve jumping upPressure, along with the increase of LNG filling weight, tank car pressure can transfer decline to, after entrucking, LNG groovePressure stability in car is in 0.1MPa;
Above-mentioned loading method is to utilize the cold in cold LNG to carry out condensation recovery BOG, concrete theoretical calculatingFormula is as follows:
A) suppose entrucking pressure to bring up to 0.45MPaG, calculate the cold of crossing of LNG,
The cold of crossing of feed liquor LNG calculates by formula (1):
E1＝M1×(H2-H1)×1.055056×2204.62＝1587493kJ，(1)
In formula (1):
E1Represent the cold (kJ) excessively that feed liquor LNG has,
M1Represent the quality (t) of feed liquor LNG,
H1Represent that LNG pressure before entrucking is 0.45MPaG, the feed liquor temperature enthalpy while being-156 DEG C(Btu/lb)，
H2Represent that LNG pressure before entrucking is the enthalpy (Btu/lb) under 0.45MPaG, saturation temperature;
Enthalpy (the H that medium has1、H2) can check in (seeing Fig. 1) by the P-H phasor of methane.
In LNG tank car, the required cold of the whole condensations of BOG calculates by formula (2):
E2＝M2×(H3-H1)×1.055056×2204.62＝157516.7kJ，
In formula (2):
E2Represent the cold (kJ) that the whole condensations of BOG are required,
M2Represent the quality (t) of BOG in LNG tank car,
H3Represent that BOG pressure before entrucking is enthalpy when temperature is-112 DEG C before 0.45MPaG, entrucking(Btu/lb)；
E1＞＞E2. Calculating shows, adds various heat loss, under 0.45MPaG, and feed liquor LNG instituteThe cold of crossing having completely can be by whole the BOG in entrucking process condensations recovery.
B) before entrucking, do not discharge BOG, the final pressure P reaching in LNG tank car after calculating entrucking2, rootAccording to the first law of thermodynamics, calculate the required cold enthalpy difference of mistake of feed liquor LNG, formula is as follows:
ΔH＝0.00042992×E2/M3＝3.53Btu/lb，(3)
In formula (3):
Δ H represents the cold enthalpy difference of the required mistake of feed liquor LNG (Btu/lb),
M3Represent feed liquor LNG amount (t).
According to the LNG saturation pressure at enthalpy difference and corresponding feed liquor temperature, the P-H phasor of looking into methane can obtain:
P2＝0.0724MPaG。
In sum, add heat loss, the final pressure that after entrucking, tank car tank reaches is about 0.08MPaG,The high 0.04MPaG of pressure while only returning to entrucking than BOG, much smaller than tank car tank design operation pressure. From energyAmount EQUILIBRIUM CALCULATION FOR PROCESS, sealing entrucking is feasible technically.
Below again by entrucking pressure process is changed and analyzed, further to prove to seal entruckingFeasibility:
According to the operational procedure of tank car entrucking, the initial stage enters the LNG of tank car tank with the speed of 150kg/minBy tank deck spray pipe 4, tank car tank is carried out coolingly, after approximately 15 minutes, carry out again full speed and fill. IfTank car tank gas phase pipeline and house steward BOG are communicated with, and in whole process, pressure can a little higher than house steward BOG of receiving station,Do not have large variation (seeing Fig. 2).
Not opening tank car gas phase when returning to valve and carrying out entrucking, the BOG in tank is in pressure 0.45MPaG,The superheat state of temperature-112 DEG C, the initial stage enter LNG cooling in tank car inevitable some can be by tank carInterior BOG gasification, causes tank car internal pressure to raise. Along with constantly entering of LNG, BOG is constantly by coldBut, temperature reduces gradually, and in the time that BOG is cooled to the saturation temperature under corresponding pressure, pressure just no longerRise, then progressively decline. The design of pressure rising speed and amplitude and tank car tank top spray pipe dividesThe speed that cloth, heat exchange efficiency and LNG enter is relevant, can measure by practical operation.
Measure by trial assembly, two kinds of tank car rate of pressure rise that Fujian LNG now fills and amplitude approach,Filling beginning 5 minutes, after the highest rising 0.05MPaG of tank pressure, just starting to decline, while end to entruckingTank internal pressure is about 0.08～0.1MPaG (seeing Fig. 3). The peak of its pressure rise and final tank pressureRelevant with tank car status before entrucking, longer if tank car ullage is put the time, BOG temperature is higher,High pressure and final tank pressure are higher, and vice versa.
In sum, LNG tank car sealing loading method of the present invention can be realized completely.
Fujian LNG tank car charging system came into operation on June 27th, 2008, and the initial stage of coming into operation adopts and establishes alwaysThe loading method of the BOG discharge of meter. Raising the impact of transportation range assessed with regard to final tank pressure,And to filling weight setting under the setting of entrucking process superpressure emission point pressure, automatic filling pattern, manually fillUnder pattern, fill after the corresponding control indexs of formulation such as time restriction, change groove on October 25th, 2008Car entrucking operational procedure, has implemented sealing loading method. To on August 10th, 2014, safe entrucking138000, by 0.315 ton of/calculating of entrucking BOG discharge capacity of actual measurement, reduce altogether 43470Ton BOG produces, and has reached Expected Results.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all in the present inventionSpirit and principle within, any amendment of doing, be equal to replacement, improvement etc., all should be included in thisWithin bright protection domain.
Claims (4)
1. while utilizing LNG cold energy to reclaim tank car entrucking, a method of BOG, is characterized in that, comprisesFollowing steps:
1) before the entrucking of LNG tank car, pressure is 0.1～0.5MPaG, if pressure is greater than 0.5MpaG, opensValve on BOG gas phase return arm unloads and is depressed into below 0.5MPaG;
2) when entrucking starts, only open the liquid flowing valve at LNG tank car top, then pass through liquid flowing valveTo be less than 12m3The flow of/h is filled with LNG, and LNG enters in tank car tank, by LNG tank car inner topSpray pipe carries out cooling to LNG tank car, make portion gas again be liquefied as LNG, pass into 2～3 tons completeBecome precooling, and then open LNG tank car bottom feed valve, LNG is filled;
3) entrucking process initial stage pressure rise 0.1MPa～0.2MPa, along with the increase of LNG filling weight,LNG tank car internal pressure can transfer decline to, and after entrucking, the pressure stability in LNG tank car is at 0.15MPaIn;
Above-mentioned loading method is to utilize the cold in cold LNG to carry out condensation recovery BOG, concrete theoretical calculatingFormula is as follows:
A) before the entrucking of LNG tank car, pressure is 0.1～0.5MPaG, calculates the cold of crossing of LNG,
The cold of crossing of feed liquor LNG calculates by formula (1):
E1＝M1×(H2-H1)×1.055056×2204.62＝1587493kJ，(1)
In formula (1):
E1Represent the cold excessively that feed liquor LNG has,
M1Represent the quality of feed liquor LNG,
H1Represent that LNG pressure before entrucking is 0.1～0.5MPaG, the feed liquor temperature enthalpy while being-156 DEG C,
H2Represent that LNG pressure after entrucking is the enthalpy under 0.1～0.5MPaG, saturation temperature;
In LNG tank car, the required cold of the whole condensations of BOG calculates by formula (2):
E2＝M2×(H3-H1)×1.055056×2204.62＝157516.7kJ，
In formula (2):
E2Represent the required cold of the whole condensations of BOG,
M2Represent the quality of BOG in LNG tank car,
H3Represent that BOG pressure before entrucking is enthalpy when temperature is-112 DEG C before 0.1～0.5MPaG, entrucking;
B) before entrucking, do not discharge BOG, the final pressure P reaching in LNG tank car after calculating entrucking2, rootAccording to the first law of thermodynamics, calculate the required cold enthalpy difference of mistake of feed liquor LNG, formula is as follows:
ΔH＝0.00042992×E2/M3＝3.53Btu/lb，(3)
In formula (3):
Δ H represents the cold enthalpy difference of the required mistake of feed liquor LNG,
M3Represent feed liquor LNG amount.
2. the method for BOG while utilizing LNG cold energy to reclaim tank car entrucking according to claim 1,It is characterized in that, in step 2) in, the speed that passes into LNG by liquid flowing valve is 150kg/min.
3. the method for BOG while utilizing LNG cold energy to reclaim tank car entrucking according to claim 1,It is characterized in that, in step 2) in, the time that completes precooling is 10～20 minutes.
4. the method for BOG while utilizing LNG cold energy to reclaim tank car entrucking according to claim 1,It is characterized in that, in step 2) in, the flow that LNG is filled is 50～70 cubes ms/h.
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| CN104791602B (en) * | 2015-04-27 | 2018-06-05 | 武汉交圣新能源工程有限公司 | The LNG gaseous fuels air supply method and device that BOG is preferentially utilized |
| CN107092767B (en) * | 2016-04-12 | 2020-07-28 | 深圳中燃哈工大燃气技术研究院有限公司 | Method for calculating storage amount and generation amount of BOG in L NG storage tank |
| CN108731374A (en) * | 2018-06-14 | 2018-11-02 | 蚌埠艾普压缩机制造有限公司 | A kind of BOG recycling reliquefaction installation |
| CN114659020B (en) * | 2022-03-21 | 2023-08-25 | 烟台杰瑞石油装备技术有限公司 | Liquid nitrogen equipment and control method thereof |
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| WO2009126604A1 (en) * | 2008-04-11 | 2009-10-15 | Fluor Technologies Corporation | Methods and configuration of boil-off gas handling in lng regasification terminals |
| US9823014B2 (en) * | 2011-04-19 | 2017-11-21 | Babcock Ip Management (Number One) Limited | Method of cooling boil off gas and an apparatus therefor |
| CN202868298U (en) * | 2012-10-25 | 2013-04-10 | 中国石油化工股份有限公司 | Gradient utilization system of LNG (Liquefied Natural Gas) cold energy |
| CN103062620B (en) * | 2013-01-24 | 2014-06-11 | 成都深冷液化设备股份有限公司 | Low-temperature BOG gas cold energy recovery device and process |
| CN103343881B (en) * | 2013-06-19 | 2015-09-02 | 广州华丰能源科技有限公司 | A kind of technique and device thereof reclaiming BOG |
| CN103759135B (en) * | 2014-01-09 | 2015-09-16 | 华南理工大学 | A kind of LNG storage means of BOG zero-emission and device |
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