CN204592854U - The LNG gaseous fuel air feeder that BOG preferentially utilizes - Google Patents
The LNG gaseous fuel air feeder that BOG preferentially utilizes Download PDFInfo
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- CN204592854U CN204592854U CN201520257871.1U CN201520257871U CN204592854U CN 204592854 U CN204592854 U CN 204592854U CN 201520257871 U CN201520257871 U CN 201520257871U CN 204592854 U CN204592854 U CN 204592854U
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Abstract
The utility model relates to the LNG gaseous fuel air feeder that a kind of BOG preferentially utilizes, and easily occurs that equipment freezes to work, the problem of fuel utilization rate variance when solving poor reliability, the device start that existing LNG gaseous fuel air feed exists.Technological scheme comprises LNG storage tank, liquid outlet bottom described LNG storage tank is connected with vaporizer through pressure inlet, described vaporizer comprises fuel heat exchanger and from pressurised heat exchangers, described pressure inlet being connected from the suction port of pressurised heat exchangers with LNG storage tank top through vaporizer, the relief opening at described LNG storage tank top is connected with gas-fired equipment through air supply pipe and fuel heat exchanger.The utility model structure is simple, easy and simple to handle, volume is little, reliability is high, Security is good, equipment investment and operating cost is low, fuel availability is high, environmentally friendly.
Description
Technical field
The utility model relates to a kind of LNG fuel air feeder.
Background technique
Based on usual understanding, the fluid in oil tank is fuel, and oil fuel aspirates from the bottom of oil tank, supply fuel oil facility.Gas in oil tank inner fluid superjacent air space is not then thought for the fuel quoted, often to arrange to reduce pressure directly.
Current LNG gaseous fuel air feeder, what such as the supply of LNG powered ship gaseous fuel adopted is through being gasificated into the gasification air feed craft of gaseous state NG by LNG (liquid state).By the air feeder of LNG direct gasification, employing be LNG storage tank low level fluid plenum system, add low level interface quantity, pipeline valve member needs to carry out daily opening and closing operation, and connected node is many, considerably increases risk of leakage; What is more, before the facility of motor and other natural gas fuel starts and initial start stage, there is no enough hot water supply vaporizers, the LNG stream of-161.5 DEG C even lower is when the heat exchange interface that temperature is originally not high in a large number, vaporizer is easily made to freeze to work, air feed is caused to realize smoothly, power system paralysis ship.
What current antifreeze liquid generally adopted is ethylene glycol, itself and water press 1:1 volume ratio mixed solution, freezing point is about-40 DEG C, due to the characteristic of ethylene glycol itself, when its ratio reaches 56%, substantially minimum freezing point about-47 DEG C is reached, then, improve ethylene glycol ratio, freezing point raises on the contrary, in other words, faced by the LNG of-161.5 DEG C even lower, the glycol water that heat can not get supply in time freezes to be inevitable, and except a large amount of space mounting air-heating type gasifier of non-sacrificial, the technique that there is no maturation at present solves this and states problem.
In the facility operation process of motor with other natural gas fuel, due to the change of load, the pressure of change to upstream gas of air consumption has fluctuation, and volume sharply expands after LNG gasification, it brings larger pressure surge to air supply system, especially when load reduces, even has hot gas and returns and alter to LNG storage tank, cause BOG pressure excessive, safety valve is opened and is diffused.
Summary of the invention
The purpose of this utility model is to solve the problems of the technologies described above, and provides that a kind of structure is simple, easy and simple to handle, volume is little, reliability is high, Security is good, LNG gaseous fuel air feeder that equipment investment and operating cost is low, environmentally friendly, fuel availability is high BOG preferentially utilize.
The utility model air feeder, comprise LNG storage tank, liquid outlet bottom described LNG storage tank is connected with vaporizer through pressure inlet, described vaporizer comprises fuel heat exchanger and from pressurised heat exchangers, described pressure inlet being connected from the suction port of pressurised heat exchangers with LNG storage tank top through vaporizer, the relief opening at described LNG storage tank top is connected with gas-fired equipment through air supply pipe and fuel heat exchanger.
Described pressure inlet is provided with pressure inlet root valve and boost pressure regulation valve; Described air supply pipe is provided with air supply pipe root valve and air feed Emergeny Cutoff Valves.
Liquid entering hole is established at described LNG storage tank top, and liquid entering hole is set in bottom, and liquid inlet pipe is connected with upper and lower liquid entering hole respectively through feed liquor Emergeny Cutoff Valves, and described upper liquid entering hole is connected with the spray equipment at LNG storage tank top.
The LNG gaseous fuel air supply method using the BOG of above-mentioned air feeder preferentially to utilize, comprises air feed flow process and supercharging flow process:
Air feed flow process: the BOG in LNG storage tank gas-phase space is drawn by the relief opening at LNG storage tank top, sends in gas-fired equipment after being warming up to operating temperature and use in the back segment heat exchanging tube of air supply pipe feeding heat exchanger;
Supercharging flow process: the LNG in LNG storage tank liquid Space is drawn by liquid outlet, send in the leading portion heat exchanging tube of heat exchanger through pressure inlet, enter to maintain the pressure in LNG storage tank in the gas-phase space of LNG storage tank through suction port loopback after making LNG be gasificated into NG, and continue through relief opening to air feed in described air supply pipe simultaneously.
Also include LNG and fill flow process:
LNG establishes the lower liquid entering hole of upper liquid entering hole and bottom to pass in tank by LNG storage tank top through liquid inlet pipe respectively, and the spray equipment of the LNG passed into by upper liquid entering hole through LNG storage tank top sprays in LNG storage tank gas-phase space.
For Problems existing in background technique, inventor improves existing LNG gaseous fuel air feeder, overcome the usual understanding of common art personnel, the gas of LNG storage tank gas-phase space is used as fuel gas, and it can be used as the preferential object used, that is, first vaporizer is improved, it is by two hot device components of heat exchange, one is from pressurised heat exchangers, one is fuel heat exchanger, by by the relief opening at LNG storage tank top through air supply pipe, the fuel heat exchanger of vaporizer is connected with gas-fired equipment, when ensureing each air feed, the BOG of preferential extraction LNG storage tank gas-phase space, be connected with the suction port changing exchanger and LNG storage tank top from supercharging heat of vaporizer successively by the pressure inlet of liquid outlet, realize when LNG storage tank pressure drop, be LNG storage tank supercharging in gas-phase space loopback after LNG gasification in LNG storage tank being entered LNG storage tank by the mode of supercharging, and form the state continuing air feed.
Although BOG (being BOG and NG during lasting air feed under pressurized state) is cryogenic gas in LNG storage tank, can not directly introduce in gas-fired equipment, need to utilize heat exchanger to heat BOG, make it the intake temperature requirement meeting gas-fired equipment, but to the heating of BOG relative in conventional art to LNG gasification and the heat energy consumed required for Synchronous Heating is much smaller, therefore, before adopting the utility model preferentially to use the technological scheme of BOG to start for the facility of motor and other natural gas fuel and initial start stage, can greatly reduce the requirement of heat energy, the under-supply problem causing glycol water to freeze of hot water can not be there is, thus solve in prior art and start shipment the under-supply vaporizer that causes of initial stage heat energy and freeze to work, air feed cannot realize smoothly, the generation of the problems such as power system paralysis.On the other hand, due to few to the required heat energy of BOG or NG heating of gaseous state, thus, simply can transform existing conventional heat exchanger, a part of heat exchange area of vaporizer is utilized to heat BOG as fuel heat exchanger, another part heat exchange area then can to as from supercharging heat exchanger LNG carried out supercharging be gasificated into NG after loopback enter supercharging in LNG storage tank, instead of directly flow to gas-fired equipment and use.Owing to not needing to become fuel temperature state to LNG direct gasification, therefore do not need this part LNG heating-up temperature too high yet, thus reduce the consumption of heat energy.
And, in the utility model, due to pressure inlet being connected from the suction port of pressurised heat exchangers with LNG storage tank top through vaporizer, draw LNG by LNG storage tank and directly can not send into gas-fired equipment after gasifying through heat exchanger, but be recycled in LNG storage tank, for gas-fired equipment after being heated by the mixed gas of the BOG or BOG and NG that export gaseous state in LNG storage tank again, therefore, by monitoring LNG storage tank internal pressure, the pressure of LNG storage tank and air supply system can be controlled well, avoid hot gas to return altering the problem of LNG storage tank, greatly reduce BOG pressure in LNG storage tank excessive, the problem causing LNG storage tank safety valve to be opened diffusing occurs, really realize energy-saving and emission-reduction, environment amenable object.
Beneficial effect:
(1) the utility model has abandoned traditional method to LNG direct gasification heating air feed, but adopt the process program of the mixed gas heating air feed to BOG or BOG and NG, control simple, when effectively can avoid system cold start, loaded down with trivial details operation and the heat exchanger medium easily problem such as freezing, ensure that reliability and the Security of system.
(2) preferentially BOG is used during air feed, maximally utilise BOG, to greatest extent for LNG storage tank reserves BOG storage area, reliably can maintain the stable pressure environment of air supply system, NG or BOG is suppressed to be discharged by Safety relief valve group to greatest extent, the natural wastage of effective reduction LNG fuel, energy saving, improves fuel economy.
(3) the utility model method is simple, simply can transform existing vaporizer, seem vaporizer to be made up of two heat exchangers, but in fact can't increase the heat exchanging tube overall length of original vaporizer, and there is energy-saving and cost-reducing effect, decrease the application of low level interface, low temperature process valve member, equipment and material simultaneously, be conducive to improving safety reliability, reduce equipment investment and operating cost.
(4) LNG fills in flow process and adopts spray equipment to carry out top to fill, ensure after charging operation terminates, LNG storage tank gas-phase space is in lower pressure state, then can reserve more daily BOG and store boost pressure interval, postpone Safety relief valve group and start release.
(5) the utility model structure simple, safe and reliable, reduce potential safety hazard, improve environmental protection level.
(6) the utility model is applicable to various LNG gaseous fuel air feeder, as LNG powered ship gaseous fuel air feeder.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Wherein, 1-LNG storage tank, 1.1-gas-phase space, 1.2-liquid Space, the upper liquid entering hole of 1.3-, liquid entering hole under 1.4-, 1.5-suction port, 1.6-relief opening, 1.7-liquid outlet, 2-air supply pipe, 3-pressure inlet, 4-liquid inlet pipe, 5-vaporizer, 5.1-fuel heat exchanger, 5.2-is from pressurised heat exchangers, 6-pressure inlet root valve, 7-boost pressure regulation valve, 8-air supply pipe root valve, 9-air feed Emergeny Cutoff Valves, 10-Safety relief valve group, 11-feed liquor Emergeny Cutoff Valves, the upper liquid feed valve of 12-, liquid feed valve under 13-, 14-fills muffler, 15-fills muffler root valve, 16-fills Emergeny Cutoff Valves, 17-spray equipment.
Embodiment
Below in conjunction with accompanying drawing, explanation is further explained to the utility model:
The utility model apparatus structure is as follows:
Liquid outlet 1.7 bottom LNG storage tank 1 is connected with vaporizer 5 through pressure inlet 3, fuel heat exchanger 5.1 is provided with and from pressurised heat exchangers 5.2 in described vaporizer 5, described pressure inlet 3 is connected with the suction port 1.5 at LNG storage tank 1 top through the fuel heat exchanger 5.1 of vaporizer 5, the relief opening 1.6 at described LNG storage tank 1 top is connected with gas-fired equipment from pressurised heat exchangers 5.2 through air supply pipe 2 and vaporizer 5, and described pressure inlet 3 is provided with pressure inlet root valve 6 and boost pressure regulation valve 7; Described air supply pipe 2 is provided with air supply pipe root valve 8 and cut-off valve 9 tightly cut by air feed, liquid entering hole 1.3 is established at described LNG storage tank 1 top, liquid entering hole 1.4 is set in bottom, liquid inlet pipe 4 is connected with the upper and lower liquid entering hole 1.3,1.4 being provided with upper liquid feed valve 12 and lower liquid feed valve 13 more respectively through feed liquor Emergeny Cutoff Valves 11, described upper liquid entering hole 1.3 is connected with the spray equipment 17 at LNG storage tank 1 top, described LNG storage tank 1 top is also provided with Safety relief valve group 10, also be connected with and fill muffler 14, described in fill muffler 14 and be provided with and fill Emergeny Cutoff Valves 16 and fill muffler root valve 15.
Below for the LNG gaseous fuel air feeder of LNG powered ship, by LNG storage tank 1 air feed, supercharging, fill time relevant operational flow as follows:
When LNG storage tank 1 is built with LNG, liquid level is called gas-phase space 1.1 (BOG temperature is for-160 degrees centigrade) with upper part, and liquid level is called liquid Space 1.2 (LNG temperature is for-161.5 DEG C) with lower part.
Air feed flow process when gas-fired equipment just starts: the BOG in LNG storage tank 1 gas-phase space 1.1 is drawn by the relief opening 1.6 at LNG storage tank 1 top, successively through the air supply pipe root valve 8 on air supply pipe 2 and air feed Emergeny Cutoff Valves 9 send into vaporizer 5 in pressurised heat exchangers 5.2, be warming up to operating temperature (25-40 degree Celsius) after send in gas-fired equipment and use;
The pressure of gas-phase space 1.1 in LNG storage tank 1 is continued to monitor, when pressure is lower than setting value, carries out supercharging flow process:
LNG in LNG storage tank 1 liquid Space 1.2 is drawn by liquid outlet 1.7, pressure inlet root valve 6 on pressure inlet 3 successively, boost pressure regulation valve 4 is sent in the fuel heat exchanger 5.1 of vaporizer 5, enter in the gas-phase space 1.1 of LNG storage tank 1 through suction port 1.5 loopback to maintain the pressure in LNG storage tank 1 after making LNG be gasificated into NG, gas (mixed gas of BOG and NG) in gas-phase space 1.1 continues through relief opening 1.6 to air feed in described air supply pipe 2, send into being warming up in pressurised heat exchangers 5.2 of vaporizer 5 through the air supply pipe root valve 8 on air supply pipe 2 and air feed Emergeny Cutoff Valves 9 successively to send into gas-fired equipment after operating temperature (25-40 degree Celsius) and use.Pressure in tight monitoring LNG storage tank 1, regulates LNG stream amount to control amount of vaporization by boost pressure regulation valve 4, thus controls the stable of LNG storage tank 1 internal pressure, avoids Safety relief valve group in LNG storage tank 1 to start 10 releases.
After blower operations, when the pressure of gas-phase space 1.1 reaches setting value in LNG storage tank 1, then close pressure inlet root valve 6, stop supercharging flow process until below when pressure is down to setting value again time, open pressure inlet root valve 6, repeat above-mentioned supercharging flow process.
Flow process is filled to LNG storage tank 1: fill Emergeny Cutoff Valves 16 and be communicated with release with the muffler 14 that fills filling muffler root valve 15 with the gas phase of LNG terminal by being provided with, and liquid inlet pipe 4 is communicated with the liquid phase of LNG terminal fills, LNG (liquid phase) to be directly filled with the liquid Space 1.2 in LNG storage tank 1 through lower liquid entering hole 1.4 through liquid inlet pipe 4 part, the upper liquid entering hole 1.3 of remaining part feeding fills LNG mode through spray equipment 17 with top again and carries out spraying cooling, ensure after charging operation terminates, LNG storage tank 1 gas-phase space is in lower pressure state, then can reserve more daily BOG and store boost pressure interval, postpone Safety relief valve group 8 and start release.
Claims (3)
1. the LNG gaseous fuel air feeder that preferentially utilizes of a BOG, comprise LNG storage tank, liquid outlet bottom described LNG storage tank is connected with vaporizer through pressure inlet, it is characterized in that, described vaporizer comprises fuel heat exchanger and from pressurised heat exchangers, described pressure inlet being connected from the suction port of pressurised heat exchangers with LNG storage tank top through vaporizer, the relief opening at described LNG storage tank top is connected with gas-fired equipment through air supply pipe and fuel heat exchanger.
2. the LNG gaseous fuel air feeder that preferentially utilizes of BOG as claimed in claim 1, it is characterized in that, described pressure inlet is provided with pressure inlet root valve and boost pressure regulation valve; Described air supply pipe is provided with air supply pipe root valve and air feed Emergeny Cutoff Valves.
3. the LNG gaseous fuel air feeder that preferentially utilizes of BOG as claimed in claim 1 or 2, it is characterized in that, liquid entering hole is established at described LNG storage tank top, liquid entering hole is set in bottom, liquid inlet pipe is connected with upper and lower liquid entering hole respectively through feed liquor Emergeny Cutoff Valves, and described upper liquid entering hole is connected with the spray equipment at LNG storage tank top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520257871.1U CN204592854U (en) | 2015-04-27 | 2015-04-27 | The LNG gaseous fuel air feeder that BOG preferentially utilizes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520257871.1U CN204592854U (en) | 2015-04-27 | 2015-04-27 | The LNG gaseous fuel air feeder that BOG preferentially utilizes |
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| CN204592854U true CN204592854U (en) | 2015-08-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791602A (en) * | 2015-04-27 | 2015-07-22 | 武汉交圣新能源工程有限公司 | LNG (liquefied natural gas) fuel supply method and device utilizing BOG (boil-off gas) preferentially |
| CN107202244A (en) * | 2016-03-18 | 2017-09-26 | 青岛蓝硅新能源装备有限公司 | A kind of small-sized LNG gas cylinders air supply system |
| CN109506126A (en) * | 2018-11-30 | 2019-03-22 | 上海海威斯特保温工程有限公司 | A kind of re-liquefied fuel dispensing system of small-sized LNG fuel ship BOG |
-
2015
- 2015-04-27 CN CN201520257871.1U patent/CN204592854U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791602A (en) * | 2015-04-27 | 2015-07-22 | 武汉交圣新能源工程有限公司 | LNG (liquefied natural gas) fuel supply method and device utilizing BOG (boil-off gas) preferentially |
| 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 |
| CN107202244A (en) * | 2016-03-18 | 2017-09-26 | 青岛蓝硅新能源装备有限公司 | A kind of small-sized LNG gas cylinders air supply system |
| CN109506126A (en) * | 2018-11-30 | 2019-03-22 | 上海海威斯特保温工程有限公司 | A kind of re-liquefied fuel dispensing system of small-sized LNG fuel ship BOG |
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