CN203336232U - LNG liquid adding station evaporation gas recycling device - Google Patents
LNG liquid adding station evaporation gas recycling device Download PDFInfo
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- CN203336232U CN203336232U CN2013201350982U CN201320135098U CN203336232U CN 203336232 U CN203336232 U CN 203336232U CN 2013201350982 U CN2013201350982 U CN 2013201350982U CN 201320135098 U CN201320135098 U CN 201320135098U CN 203336232 U CN203336232 U CN 203336232U
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Abstract
The utility model provides an LNG liquid adding station evaporation gas recycling device and belongs to the technical field of low-temperature liquefied gas storage and transportation. The recycling device comprises an LNG storage tank, a low-pressure gas storage tank, a medium-pressure gas storage tank, an LNG liquid adding vehicle, an LNG car, a multi-stage natural gas compressor and a one-way valve. The LNG storage tank is provided with a liquid adding valve, a safety valve, a liquid using valve, a pressure adjusting valve and an emptying valve. The design pressure of the low-pressure gas storage tank is 0.1 MPa, and the low-pressure gas storage tank is provided with a gas using valve; the pressure of the medium-pressure gas storage tank is 1.6 MPa, and the medium-pressure gas storage tank is provided with a first gas using valve and a second gas using valve; the LNG liquid adding vehicle is provided with a pressure increasing valve and a liquid using valve; one end of the one-way valve is connected with an outlet of the multi-stage natural gas compressor, and the other end of the one-way valve is connected with an inlet of the medium-pressure gas storage tank; a control cabinet of the multi-stage natural gas compressor is provided with an alarm device. According to the recycling device, two methods can be used for fully recycling evaporation gas in the LNG storage tank, and three methods are used for reusing recovered natural gas in an LNG liquid adding station. The recycling device can solve the problem that evaporation gas of the LNG storage tank is directly discharged to affect the environment and safety, and the recycling device has an important role and far-reaching influence on improving economic benefits, reducing energy consumption and protecting the environment due to the fact that recycling saves LNG consumption.
Description
Technical field
The utility model relates to a kind of rock gas recycling device, and especially a kind of LNG Liquefied natural gas (LNG, Liquefied Natural Gas) liquid filling station boil-off gas recycling device, belong to liquefied gas at low temp storaging and transport technology field.
Background technique
Rock gas, as a kind of clear energy sources, is the fuel that generally acknowledged future world generally adopts, and it is obvious with respect to " fossil fuel " Economy such as electric power, coal, oil, and price steadiness.The related data demonstration, within 2011, global rock gas residue charcoal recoverable coal reserves is 191 tcms, the rock gas total amount is 300,000,000 2364 tcms.As substitute energy source for petroleum, the enriching reserves and can allow the global energy demand there is no trouble and worry within a very long time of rock gas.
Along with the development of Chinese society doctrine economic construction, the today in country to the environmental protection pay attention to day by day, greatly develop LNG Liquefied natural gas (LNG) fuel automobile and have important practical significance to substitute the traditional fuel automobile.With fuel vehicle, compare, the noxious gas emission of LNG highway passenger vehicle can reduce 85%, and comprehensive carbon emission can reduce by 95%, and noise can reduce 40%.Particularly, in the situation that PM2.5 has been included into the Detection of Air Quality standard, the advantage of LNG is more outstanding.In recent years, the LNG automobile was promoted on a large scale and was used.The LNG liquid filling station matched with the LNG automobile is rapid growth also.Whole nation accumulative total has 19 cities (area) to become national gas combustion automobile Demonstration And Extension city at present, and by 2011, China's built LNG liquid filling station quantity rapid growth sum reached more than 200.The LNG of China in 2012 fixedly liquid filling station sum increases to nearly 400.
Due to present stage LNG automobile, also in the popularization stage, quantity is compared also fewer with the traditional fuel automobile, brings certain impact therefore to the operation of LNG liquid filling station, and the discontinuous operating characteristics of LNG liquid filling station is obvious.LNG storage tank in liquid filling station is for dealing with the liquid feeding peak, usually the certain liq storage level to be arranged, so in the process of liquid filling station day-to-day operation, the vaporization that certainly will cause pot liquid of importing into due to the outer heat of storage tank, when if liquid filling station does not have the liquid feeding operation for a long time, in tank, LNG is due to continuous endothermic gasification, and when its pressure reaches safety valve jumping up pressure, the rock gas in tank is by let-down vessel.In addition, the LNG storage tank is carried out to LNG while filling at every turn, in order to regulate pressure, also will be to the step-down of being released of gas in storage tank.So not only can cause the waste of rock gas, and pollute the environment and even bring potential safety hazard.At present, the liquid filling station come into operation is investigated to demonstration, after this part gasification, the amount of natural gas of discharge is very huge, and in some liquid filling station, the amount of vaporization of LNG is up to more than 30%.Utilize specific recycling device, the rock gas gas problem that directly discharge impacts environment and safety will be solved, also will realize the effective recycling of LNG boil-off gas, promote the safety energy-conserving environment protection of LNG liquid filling station operation link, promote and there is profound significance for the use of rock gas, for the safe operation of LNG liquid filling station provides strong guarantee.
In prior art, the patent of invention of application number 201110082580.X " liquefied natural gas boiloff gas reclaims the apparatus and method of liquefaction again ", develop a kind of liquefied natural gas boiloff gas and reclaimed the device of liquefaction again, comprise between the storage tank with safety valve and cryopump and be provided with recovery tube, boil-off gas liquefies through intermediate equipment, and the rock gas after liquefaction is sent into and reentered storage tank; Its advantage is to adopt helical-lobe compressor directly to reclaim boil-off gas and directly use the screw expansion of boil-off gas as refrigeration agent--compressor bank refrigeration method of re-liquefaction, simplify the system flow equipment, stopped energy waste, avoided surrounding enviroment are polluted and potential safety hazard, thereby created significant economic benefit and social benefit; Secondly, system is the continuously circulation running of automation all the time, has that excellent operating conditions and utilization efficiency are high, operational reliability good.The utility model patent of application number 201120494291.6 " for the boil-off gas recovery device of liquefied of LNG Liquefied natural gas receiving station ", developed a kind of recovery device of liquefied of the boil-off gas for LNG Liquefied natural gas receiving station, with the boil-off gas recovery device of liquefied for LNG Liquefied natural gas receiving station in the past, with technology, compare, characteristics are that plant area is little, number of devices is few, technological process and simple to operate, and toggle speed is fast, safe and reliable, invest low.The patent of invention of application number 02157974.1 " a kind of vapor recovery unit of LNG Liquefied natural gas ", when introducing the steam of this device withdrawal liquid rock gas in patent, by remaining cold storage, and, this device is used the equipment such as conventional low-temperature (low temperature) vessel, invest little, simple in structure, easy to operate, economic benefit is high, is applicable to the LNG Liquefied natural gas supply station of middle-size and small-size scale.In these patents, be all that the gas after reclaiming is liquefied and then sends storage tank back to, reclaiming like this rock gas just needs to drop into a large amount of natural gas liquefaction devices, has increased cost.In fact, in three main process of LNG liquid filling station operation (unload, liquid feeding, pressure regulation), need to directly utilize gaseous natural gas, and often in these three processes required rock gas also to, by specially the LNG in storage tank being gasified to obtain, cause like this LNG further to waste.If therefore the rock gas emitted can be reclaimed, when needs use gas, it is being used, this is of great practical significance to energy-conserving and environment-protective.
The model utility content
For deficiency and the defect that overcomes prior art, the utility model provides a kind of recycling device of LNG boil-off gas, for recovery and the recycling of LNG liquid filling station evaporated natural gas, this device comprises LNG storage tank, low pressure gasholder, middle pressure gas holder, LNG liquid feeding car, LNG automobile, multistage natural air compressor, one-way valve.Wherein, be furnished with charging valve, safety valve on the LNG storage tank, use liquid valve, pressure regulator valve and atmospheric valve; The design pressure of low pressure gasholder is 0.1MPa, is furnished with the air valve of using on it; The pressure of middle pressure gas holder is 1.6MPa, is furnished with the first use air valve and second on it and uses air valve; Be furnished with pressure charging valve on LNG liquid feeding car, use the liquid valve; One end of one-way valve is connected with the outlet of multistage natural air compressor, and the other end is connected with the import of middle pressure gas holder; On the control box of multistage natural air compressor, warning device is arranged.Compressed recovery rock gas, can be used for the processes such as the unloading of liquid filling station, liquid feeding, pressure regulation.
When the LNG storage tank during in holding state, the continuous endothermic gasification of liquid in the LNG storage tank, tank inner pressure constantly rises, and when tank inner pressure increases to safety valve jumping up pressure, safety valve jumping up at this moment, outside the gas let-down vessel of evaporation; The LNG storage tank being carried out to LNG while filling, in order to regulate pressure, open LNG emptying storage tank valve gas in storage tank is released in addition.Therefore, in the LNG storage tank, the recovery of boil-off gas is divided into two parts: reclaim the gas of discharging from LNG storage tank safety valve; The gas that recovery is discharged from LNG emptying storage tank valve.The recovery of these two-part LNG boil-off gas is mainly to complete by following process: first, the gas that recovery is discharged from LNG storage tank safety valve, the boil-off gas in the LNG storage tank is taken over and is entered the low pressure gasholder storage by the safety valve gas coming through recovery of LNG storage tank.The second, the gas that recovery is discharged from LNG emptying storage tank valve, the boil-off gas in the LNG storage tank is taken over and is entered the low pressure gasholder storage by the atmospheric valve gas coming through recovery of LNG storage tank.After low pressure gasholder contains the rock gas of certain pressure, by the pressurization of multistage natural air compressor, then send middle pressure gas holder storage to after one-way valve.When the inlet pressure of compressor drops to 0.05MPa, on multistage natural air compressor control box, report to the police, the chain shutdown of multistage natural air compressor, close compressor import and closing valve is arranged.Recovery rock gas stored in middle pressure gas holder is realized recycling by three kinds of modes: the one; at LNG liquid feeding car during to LNG storage tank topping up; press the second use air valve of gas holder and the pressure charging valve of LNG liquid feeding car in unlatching; press the storage tank supercharging to LNG liquid feeding car of rock gas in gas holder in utilization, by supercharging the unload pump that can protect unloads uses, the frequency of utilization that reduces pump.The 2nd,, also to carry out the Pressurized temperature regulating of LNG storage tank after unloading, press first use the air valve and the pressure regulator valve of LNG storage tank of gas holder in unlatching, in priority application, the interior rock gas of pressure gas holder carries out the supercharging intensification to the LNG in the LNG storage tank.The 3rd,, when having the LNG automobile to carry out the liquid filling station liquid feeding, press the first use air valve of gas holder and the pressure charging valve of LNG storage tank in unlatching, in utilization, press the rock gas in gas holder to carry out supercharging to the LNG storage tank.
The utility model LNG liquid filling station boil-off gas recycling device can 100% reclaims the rock gas of evaporation in the LNG storage tank, and the gas reclaimed in the normal operation process of liquid filling station is fully utilized, the waste problem of LNG while fully solving the discharge of LNG liquid filling station boil-off gas and liquid filling station use gas.The research and development success of this covering device, will solve the impact that directly discharge causes environment and safety of rock gas gas, the LNG consumed in the time of also can saving boost demand.Promote the recycling of rock gas gas, to increasing economic efficiency, reduce energy consumption, protection of the environment has important function and profound influence, has huge economic benefit and social benefit.
The accompanying drawing explanation
The structure principle chart that Fig. 1 is the utility model LNG liquid filling station boil-off gas recycling device.
In figure, the 1st, LNG storage tank, the 2nd, low pressure gasholder, the 3rd, middle pressure gas holder, the 4th, LNG liquid feeding car, the 5th, LNG automobile, the 6th, multistage natural air compressor, the 7th, one-way valve, the 8th, the charging valve of LNG storage tank, the 9th, the safety valve of LNG storage tank, the 10th, the LNG storage tank with liquid valve, the 11st, the pressure regulator valve of LNG storage tank, the 12nd, low pressure gasholder with air valve, the 13rd, the first use air valve, the 14th of middle pressure gas holder, the second use air valve, the 15th of middle pressure gas holder, the atmospheric valve of LNG storage tank, the 16th, the pressure charging valve, the 17th of LNG liquid feeding car, LNG liquid feeding car use the liquid valve.
Embodiment:
Below in conjunction with accompanying drawing, concrete enforcement of the present utility model is further described.
As shown in Figure 1, the utility model LNG storage tank boil-off gas recycling device comprises: LNG storage tank 1, low pressure gasholder 2, middle pressure gas holder 3, LNG liquid feeding car 4, LNG automobile 5, multistage natural air compressor 6, one-way valve 7, the charging valve 8 of LNG storage tank, the safety valve 9 of LNG storage tank, the use liquid valve 10 of LNG storage tank, the pressure regulator valve 11 of LNG storage tank, the use air valve 12 of low pressure gasholder, the first use air valve 13 of middle pressure gas holder, the second use air valve 14 of middle pressure gas holder, the atmospheric valve 15 of LNG storage tank, the pressure charging valve 16 of LNG liquid feeding car, the use liquid valve 17 of LNG liquid feeding car.Pressing the pressure of gas holder 3 wherein is 1.6MPa; The pressure of low pressure gasholder 2 is 0.1MPa; On the control box of multistage natural air compressor 6, warning device is arranged; One end of one-way valve 7 is connected with the outlet of multistage natural air compressor 6, and the other end is connected with the import of middle pressure gas holder 3.
The processing of LNG storage tank 1 boil-off gas comprises recovery and reuse two-part.Below respectively from the working procedure of recovery and reuse two-part interpre(ta)tive system of LNG storage tank 1 boil-off gas.
The recovery of LNG storage tank 1 boil-off gas is divided into two-part: a part is the gas from safety valve 9 discharges of LNG storage tank 1; A part is the gas of discharging from the atmospheric valve 15 of LNG storage tank 1 in the topping up process of LNG storage tank 1.At first, in LNG storage tank 1, because causing the pressure of LNG storage tank 1, the continuous endothermic gasification of LNG raises gradually, when pressure reaches the release pressure of safety valve 9 of LNG storage tank 1, the safety valve 9 of LNG storage tank 1 is opened, gas flows into low pressure gasholder 2, realizes the recovery of the described boil-off gas of first portion; Secondly, when giving LNG storage tank 1 topping up, at first to open the atmospheric valve 15 of LNG storage tank 1, reduce the internal pressure of LNG storage tank 1, in order to complete filled, at this moment the rock gas flowed out from the atmospheric valve 15 of LNG storage tank 1 is filled with low pressure gasholder 2 by pipeline, realizes like this recovery of second portion boil-off gas.Gas filling after recovery is in low pressure gasholder 2, its internal pressure increases along with aeration quantity and raises, when gas pressure reaches 0.1MPa, open use air valve 12 and the one-way valve 7 of low pressure gasholder 2, utilize multistage natural air compressor 6 that the interior effluent air of low pressure gasholder 2 is pressurized to pressure 1.6MPa, then send in middle pressure gas holder 3 and store through one-way valve 7.When the inlet pressure of multistage natural air compressor 6 drops to 0.05MPa; on multistage natural air compressor 6 control boxs, report to the police; the chain shutdown of multistage natural air compressor 6; while multistage natural air compressor 6 import closed electromagnetic valves; close 6 imports of multistage natural air compressor and closing valve is arranged, whole recovery operation completes.
Realized recycling by following three kinds of approach after in LNG storage tank 1, the gas collection of evaporation enters middle pressure gas holder 3: first, when giving LNG storage tank 1 liquid feeding, LNG liquid feeding car 4 needs to boost in the process of unloading, at this moment press the second use air valve 14 of gas holder 3 and the pressure charging valve 16 of LNG liquid feeding car 4 in opening, in utilization, press the gas in gas holder 3 to boost to LNG liquid feeding car 4.The second, after LNG storage tank 1 topping up, press the first use air valve 13 of gas holder 3 and the pressure regulator valve 11 of LNG storage tank 1 in unlatching, in utilization, press in gas holder 3 gas to the intensification of the LNG pressure regulation in LNG storage tank 1, until the LNG balance that reaches capacity in LNG storage tank 1; The 3rd, when LNG storage tank 1 is LNG automobile 5 liquid feeding, press the first use air valve 13 of gas holder 3 and the pressure regulator valve 11 of LNG storage tank 1 in unlatching, in utilization, press gas in gas holder 3 to boost to the LNG in LNG storage tank 1, complete liquid-filled operation.Realize reclaiming the recycling process of rock gas by above-mentioned three kinds of approach.
Claims (4)
1. a LNG liquid filling station boil-off gas recycling device, comprise LNG storage tank (1), low pressure gasholder (2), middle pressure gas holder (3), LNG liquid feeding car (4), LNG automobile (5), multistage natural air compressor (6), one-way valve (7); It is characterized in that on LNG storage tank (1) being furnished with charging valve (8), safety valve (9), with liquid valve (10), pressure regulator valve (11) and atmospheric valve (15); The design pressure of low pressure gasholder (2) is 0.1MPa, on it, is furnished with air valve (12); The pressure of middle pressure gas holder (3) is 1.6MPa, is furnished with the first use air valve (13) and the second use air valve (14) on it; Is furnished with pressure charging valve (16) on LNG liquid feeding car (4), with liquid valve (17); One end of one-way valve (7) is connected with the outlet of multistage natural air compressor (6), and the other end is connected with the import of middle pressure gas holder (3).
2. LNG liquid filling station boil-off gas recycling device according to claim 1, is characterized in that, on the control box of described multistage natural air compressor (6), warning device is arranged.
3. according to claim 1 or LNG liquid filling station boil-off gas recycling device claimed in claim 2, it is characterized in that the recovery of the interior boil-off gas of described LNG storage tank (1) is divided into two parts: reclaim the gas of discharging from the safety valve (9) of LNG storage tank (1); The gas that recovery is discharged from the atmospheric valve (15) of LNG storage tank (1).
4. according to claim 1 or LNG liquid filling station boil-off gas recycling device claimed in claim 2, it is characterized in that recovery rock gas stored in described middle pressure gas holder (3) realizes recycling by three kinds of modes: the one, press the storage tank supercharging to LNG liquid feeding car (4) of rock gas in gas holder (3) in utilizing; The 2nd, in utilizing, press the rock gas in gas holder (3) to carry out the pressure regulation intensification to the LNG in LNG storage tank (1); The 3rd, when giving LNG automobile (5) topping up, in utilization, press the rock gas in gas holder (3) to carry out supercharging to LNG storage tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201350982U CN203336232U (en) | 2013-03-22 | 2013-03-22 | LNG liquid adding station evaporation gas recycling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201350982U CN203336232U (en) | 2013-03-22 | 2013-03-22 | LNG liquid adding station evaporation gas recycling device |
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| CN203336232U true CN203336232U (en) | 2013-12-11 |
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| CN2013201350982U Expired - Fee Related CN203336232U (en) | 2013-03-22 | 2013-03-22 | LNG liquid adding station evaporation gas recycling device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135208A (en) * | 2015-08-20 | 2015-12-09 | 中国石油大学(北京) | Compression recycling method for evaporation gas of liquefied natural gas |
| CN108679444A (en) * | 2018-06-06 | 2018-10-19 | 张家港艾普能源装备有限公司 | LNG storage tank is utilizing device |
| CN112460474A (en) * | 2019-09-09 | 2021-03-09 | 安瑞科(廊坊)能源装备集成有限公司 | LNG filling device and filling method |
| CN114087537A (en) * | 2020-08-24 | 2022-02-25 | 安瑞科(廊坊)能源装备集成有限公司 | Temperature control device for LNG (liquefied Natural gas) filling and LNG filling method |
-
2013
- 2013-03-22 CN CN2013201350982U patent/CN203336232U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135208A (en) * | 2015-08-20 | 2015-12-09 | 中国石油大学(北京) | Compression recycling method for evaporation gas of liquefied natural gas |
| CN108679444A (en) * | 2018-06-06 | 2018-10-19 | 张家港艾普能源装备有限公司 | LNG storage tank is utilizing device |
| CN112460474A (en) * | 2019-09-09 | 2021-03-09 | 安瑞科(廊坊)能源装备集成有限公司 | LNG filling device and filling method |
| CN114087537A (en) * | 2020-08-24 | 2022-02-25 | 安瑞科(廊坊)能源装备集成有限公司 | Temperature control device for LNG (liquefied Natural gas) filling and LNG filling method |
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