CN102425725B - System and method for reclaiming boil off gas (BOG) in liquefied natural gas (LNG) storage tank - Google Patents
System and method for reclaiming boil off gas (BOG) in liquefied natural gas (LNG) storage tank Download PDFInfo
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- CN102425725B CN102425725B CN 201110398207 CN201110398207A CN102425725B CN 102425725 B CN102425725 B CN 102425725B CN 201110398207 CN201110398207 CN 201110398207 CN 201110398207 A CN201110398207 A CN 201110398207A CN 102425725 B CN102425725 B CN 102425725B
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Abstract
The invention discloses a system and a method for reclaiming boil off gas (BOG) in a liquefied natural gas (LNG) storage tank. The system can conveniently reclaim the BOG and has good universality. The system comprises the LNG storage tank, a gas storage well and a compressor unit; the compressor unit is provided with a first gas inlet and a first gas outlet, and the first gas inlet of the compressor unit is connected with the exhaust port of the LNG storage tank through an exhaust pipe; and the first gas outlet is connected with the gas inlet of the gas storage well through a gas inlet pipe of the gas storage well. When the system is used, the BOG exhausted from the LNG storage tank is compressed into BOG with a standard pressure value for the gas storage well through the compressor unit, and the BOG is exhausted to the gas storage well and stored. Because most cities have refueling stations and gas storage wells are generally arranged in the refueling stations, the BOG in the LNG storage tank is exhausted to the gas storage well and stored; and the system is convenient, has high universality, is limited little by conditions, and is favorable for fully reclaiming and reusing the BOG in the LNG storage tank.
Description
Technical field
The present invention relates to a kind of system and method that is used to reclaim the BOG in the LNG storage tank.
Background technique
To unavoidably produce BOG in LNG uses, above-mentioned LNG is meant liquid natural gas, and above-mentioned BOG is meant the gas that is formed by liquid natural gas gasification back, and BOG is mainly derived from gasifying naturally of LNG every day about 0.3% in LNG tank car return-air and the LNG storage tank.This part BOG such as untimely discharge can make the pressure in LNG storage tank upper gaseous phase space raise.So the LNG storage tank generally is equipped with the reduction regulation valve for guaranteeing safety, can discharge BOG automatically according to pressure.
In the prior art, most BOG directly diffuse or handle by torch burning, cause very big waste and potential safety hazard.Even the existing BOG recovering means of LNG vaporizing station also has very big narrow limitation now, existing way of recycling generally is the fuel that the BOG that will reclaim is used for gas fired boiler in the winter time, when not using boiler summer, by the pressure control of knock out drum, again through pressure regulation, measure, add and incorporate BOG into the city gas line network after smelly.This way of recycling is subjected to the restriction of field condition very big, and for the area of no gas fired boiler and urban pipe network, BOG also can only diffuse or handle by torch burning.
In addition, present LNG/L-CNG gas station and substation gas station operated by rotary motion have gas storage well, the force value of the natural gas in the gas storage well is a gas storage well standard pressure value, when needs during to equipment aeratings such as gas-type automobiles, the natural gas that stores in the gas storage well can be added in the relevant device.Above-mentioned LNG/L-CNG gas station just LNG and CNG mixes the gas station that uses, and wherein CNG is meant compressed natural gas, and the substation gas station is the gas station that only uses CNG.In addition, in the prior art, all be after by tank car natural gas being transported to above-mentioned gas station, by compressor bank the natural gas in the tank car is compressed into again and enters gas storage well behind the natural gas of gas storage well with the standard pressure value and store.
Summary of the invention
The technical problem that the present invention solves provides the system that the BOG in the LNG storage tank is reclaimed in a kind of good being used to of versatility of being convenient to that BOG is recycled.
The technical solution adopted for the present invention to solve the technical problems is: be used to reclaim the system of the BOG in the LNG storage tank, comprise the LNG storage tank, also comprise gas storage well and compressor bank; Described compressor bank is provided with first suction port and first air outlet, and first suction port of described compressor bank links to each other by the relief opening of outlet pipe with the LNG storage tank; Described first air outlet links to each other with the suction port of gas storage well by the gas storage well suction tude.
Further be: described outlet pipe is provided with knock out drum, and knock out drum is provided with the knock out drum pressure-detecting device that is used to detect knock out drum internal pressure value; Described knock out drum is separated to form LNG storage tank outlet pipe and knock out drum outlet pipe with outlet pipe, and described knock out drum outlet pipe is provided with knock out drum outlet pipe control valve; The relief opening of described LNG storage tank links to each other with the suction port of knock out drum by LNG storage tank outlet pipe, and the relief opening of described knock out drum links to each other with first suction port of compressor bank by the knock out drum outlet pipe.
Further be: also comprise recycling can and be arranged on second air outlet on the compressor bank, described second air outlet links to each other with the suction port of recycling can by the recycling can suction tude; Link to each other with an end of recycling can steam outlet pipe on the pipeline of corresponding knock out drum outlet pipe between described knock out drum outlet pipe control valve and first suction port, the other end of described recycling can steam outlet pipe link to each other with the air outlet of recycling can and the recycling can steam outlet pipe on recycling can steam outlet pipe control valve is installed.
Further be: described recycling can is provided with the recycling can pressure-detecting device that is used to detect recycling can internal pressure value.
Further be: described compressor bank also is provided with second suction port that is used for linking to each other with tank car.
The present invention also provides a kind of method that is used to reclaim the BOG in the LNG storage tank that BOG is reclaimed be convenient to.
Be used to reclaim the method for the BOG in the LNG storage tank, may further comprise the steps:
A, the BOG that discharges in the LNG storage tank is compressed into the BOG of gas storage well with the standard pressure value by compressor bank;
B, gas storage well that steps A is obtained enter gas storage well with the BOG of standard pressure value and store.
Further be: described steps A may further comprise the steps:
A1, elder generation enter knock out drum with the BOG in the LNG storage tank;
A2, when the force value of the BOG in the knock out drum during more than or equal to knock out drum predetermined vent pressure value, compression forms the BOG of gas storage well with the standard pressure value through compressor bank with the BOG in the knock out drum again.
Further be: described steps A 2 may further comprise the steps:
A2-1, when the force value of the BOG in the knock out drum during more than or equal to knock out drum predetermined vent pressure value, earlier will the BOG in the knock out drum enter recycling can after through the compressor bank compression;
A2-2, then the BOG in the recycling can is formed the BOG of gas storage well with the standard pressure value through compressor bank compression back.
Further be: among the described steps A 2-2,, the more compressed unit of the BOG in the recycling can is compressed into the BOG of gas storage well with the standard pressure value when the force value of the BOG in the recycling can during more than or equal to recycling can predetermined vent pressure value.
The invention has the beneficial effects as follows:
1, adopts system and method for the present invention, BOG in the LNG storage tank can be entered in the gas storage well and store, and most of cities all are provided with LNG/L-CNG gas station or substation gas station, all be provided with gas storage well in the above-mentioned gas station, therefore the BOG in the LNG storage tank is entered both to store in the gas storage well and make things convenient for, versatility, suffered condition restriction is few, helps the BOG in the LNG storage tank is fully reclaimed and utilization once more.
2, by knock out drum is set, the force value that can work as the BOG in the knock out drum is discharged BOG and is opened compressor bank in knock out drum again during more than or equal to knock out drum predetermined vent pressure value, to enter gas storage well after the compressed unit compression of BOG then, can avoid the long-term continuously start of compressor bank to use like this, just have only and when knock out drum needs exhaust, just open compressor bank, timely closes compression unit helps energy saving when knock out drum does not need exhaust.
3, owing to be provided with recycling can, BOG in the knock out drum has carried out compression for the first time earlier when entering recycling can, BOG in the recycling can has carried out compression for the second time when entering gas storage well, owing to just make the pressure of BOG reach gas storage well standard pressure value through twice compression, can reduce performance requirement like this, and then help reducing the cost of whole recovery BOG compressor bank.
4, by the recycling can pressure-detecting device is set, the force value that can work as the BOG in the recycling can is discharged BOG and is opened compressor bank in recycling can again during more than or equal to recycling can predetermined vent pressure value, to enter gas storage well after the compressed unit compression of BOG then, can accurately control the opening and closing of compressor bank like this, help energy saving.
5, compressor bank also is provided with second suction port that is used for linking to each other with tank car, like this, this compressor bank can be done the compressor bank use of LNG/L-CNG gas station of the prior art or substation gas station on the one hand, just link to each other with tank car, be used to unload the natural gas that stores in the tank car, on the other hand, compressor bank of the prior art can be used as compressor bank of the present invention through transforming the back.
Description of drawings
Fig. 1 is the schematic representation that is used to reclaim the system of the BOG in the LNG storage tank of the present invention.
Be labeled as among the figure: knock out drum 1, knock out drum outlet pipe control valve 2, recycling can steam outlet pipe control valve 3, recycling can 4, compressor bank 5, control valve 6, recycling can steam outlet pipe 7, knock out drum outlet pipe 8,11, the first air outlets 12, first suction port 9, the second suction ports, 10, the second air outlets, discharge column 13, tank car 14, gas storage well 15, LNG storage tank 16, gas storage well suction tude 17, LNG storage tank outlet pipe 18, recycling can pressure-detecting device 19, knock out drum pressure-detecting device 20, recycling can suction tude 21, outlet pipe 22.
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, be used to reclaim the system of the BOG in the LNG storage tank, comprise LNG storage tank 16, also comprise gas storage well 15 and compressor bank 5; Described compressor bank 5 is provided with first suction port 9 and first air outlet 12, and first suction port 9 of described compressor bank 5 links to each other with the relief opening of LNG storage tank 16 by outlet pipe 22; Described first air outlet 12 links to each other with the suction port of gas storage well 15 by gas storage well suction tude 17.
During use, when generation BOG need discharge in the LNG storage tank, can open compressor bank, this part BOG is compressed into the BOG of gas storage well with the standard pressure value, then BOG be entered gas storage well and store by compressor bank.BOG in the gas storage well can use for equipment such as gas-type automobiles.Because producing BOG in the LNG storage tank is cryogenic gas, if directly store cryogenic gas, because gas temperature can raise gradually along with environmental change, therefore can cause the pressure surge in the reservoir vessel bigger, bring potential safety hazard, but among the present invention, cryogenic gas is through after the compressor compresses, the temperature of the gas in its temperature and the gas storage well is basic identical, therefore can not make the pressure in the gas storage well take place to change significantly, helps guaranteeing the safety preservation of gas storage well to gas.
Because it is limited to be used to hold the space of BOG in the LNG storage tank, therefore need frequent compressor bank and the closes compression unit opened, in order to overcome above-mentioned deficiency, as shown in Figure 1, described outlet pipe 22 is provided with knock out drum 1, and knock out drum 1 is provided with the knock out drum pressure-detecting device 20 that is used to detect knock out drum internal pressure value; Described knock out drum 1 is separated to form LNG storage tank outlet pipe 18 and knock out drum outlet pipe 8 with outlet pipe 22, and described knock out drum outlet pipe 8 is provided with knock out drum outlet pipe control valve 2; The relief opening of described LNG storage tank 16 links to each other with the suction port of knock out drum 1 by LNG storage tank outlet pipe 18, and the relief opening of described knock out drum 1 links to each other with first suction port 9 of compressor bank 5 by knock out drum outlet pipe 8.Above-mentioned knock out drum pressure-detecting device 20 can be pressure gauge or pressure transducer etc.Adopt said structure; during use; earlier the BOG in the LNG storage tank 16 is entered knock out drum 1; just collect the BOG that LNG storage tank 16 produces by knock out drum 1; when the force value of the BOG in the knock out drum 1 during more than or equal to knock out drum predetermined vent pressure value; open knock out drum outlet pipe control valve 2; 5 compressions form the BOG of gas storage well with the standard pressure value through compressor bank with the BOG in the knock out drum 1; then BOG being entered gas storage well 15 stores; when the force value in the knock out drum 1 drops to the predetermined closing pressure value of knock out drum; close knock out drum outlet pipe control valve 2, compressor bank 5 is shut down.Because the volume of knock out drum 1 is bigger, can store a large amount of BOG, therefore can avoid the frequent switching on and shutting down of compressor bank, and when having only force value as the BOG in the knock out drum 1 more than or equal to knock out drum predetermined vent pressure value, just open compressor bank 5, can avoid the long-term continuously start of compressor bank to use like this, just have only and when knock out drum needs exhaust, just open compressor bank, timely closes compression unit when knock out drum does not need exhaust, help energy saving, also help prolonging the working life of compressor bank, reduce the cost that is used to reclaim BOG.
Though the use of above-mentioned knock out drum can be avoided the frequent switching on and shutting down of compressor bank, but because the pressure of the BOG in the knock out drum 1 is generally lower, and gas storage well is higher with the standard pressure value, if the BOG in the knock out drum 1 directly is compressed into the BOG of gas storage well with the standard pressure value by compressor bank, performance requirement to compressor bank is higher, has improved the cost recovery of BOG.In order to overcome above-mentioned deficiency, as shown in Figure 1, also comprise recycling can 4 and be arranged on second air outlet 11 on the compressor bank 5 that described second air outlet 11 links to each other with the suction port of recycling can 4 by recycling can suction tude 21; Link to each other with an end of recycling can steam outlet pipe 7 on the pipeline of corresponding knock out drum outlet pipe between described knock out drum outlet pipe control valve 2 and first suction port 9, the other end of described recycling can steam outlet pipe 7 link to each other with the air outlet of recycling can 4 and recycling can steam outlet pipe 7 on recycling can steam outlet pipe control valve 3 is installed.During use, open knock out drum outlet pipe control valve 2, close recycling can steam outlet pipe control valve 3, enter in the recycling can 4 after earlier the BOG in the knock out drum 1 being compressed through compressor bank 5, when the air pressure in the knock out drum 1 drops to the predetermined closing pressure value of knock out drum, knock out drum outlet pipe control valve 2 is closed, open recycling can steam outlet pipe control valve 3 then, BOG in the recycling can 4 is formed the BOG of gas storage well with the standard pressure value through compressor bank 5 compression backs, then BOG is entered gas storage well 15 and store.By above analysis as can be known, because the BOG in the knock out drum just forms the BOG of gas storage well with the standard pressure value after through twice compression, with regard to significantly having reduced performance requirement, can significantly reduce the BOG cost recovery like this to compressor bank 5.
Force value in the above-mentioned recycling can 4 is owing to can't monitor in real time, therefore be unfavorable for accurately controlling the switching on and shutting down of compressor bank 5, in order further to help accurately controlling the switching on and shutting down of compressor bank, improve the reuse efficiency of BOG and reduce cost recovery, on the basis of the above, described recycling can 4 is provided with the recycling can pressure-detecting device 19 that is used to detect recycling can internal pressure value.Above-mentioned recycling can pressure-detecting device 19 can be pressure gauge or pressure transducer etc.Owing to be provided with recycling can pressure-detecting device 19; during use; by the force value in the recycling can pressure-detecting device 19 real-time monitoring recycling cans 4; when the force value of the BOG in the recycling can 4 during more than or equal to recycling can predetermined vent pressure value; close knock out drum outlet pipe control valve 2; open recycling can steam outlet pipe control valve 3; the compressed unit 5 of BOG in the recycling can 4 is compressed into the BOG of gas storage well with the standard pressure value; then BOG being entered gas storage well 15 stores; when the force value of the BOG in the recycling can 4 drops to recycling can closing pressure value, then close recycling can steam outlet pipe control valve 3 and compressor bank 5 is shut down.When for example the force value of the BOG in the recycling can 4 is more than or equal to 4MPa; close knock out drum outlet pipe control valve 2; open recycling can steam outlet pipe control valve 3; the compressed unit 5 of BOG in the recycling can 4 is compressed into the BOG of gas storage well with the standard pressure value; then BOG being entered gas storage well 15 stores; when the force value of the BOG in the recycling can 4 drops to 3MPa, recycling can steam outlet pipe control valve 3 is closed, and compressor bank 5 is shut down.
On the basis of the above, described compressor bank also is provided with second suction port 10 that is used for linking to each other with tank car 14.Like this, this compressor bank can be done the compressor bank use of LNG/L-CNG gas station of the prior art or substation gas station on the one hand, just can tank car 14 be linked to each other with second suction port 10 by discharge column 13 and associated pipe, pipeline is provided with control valve 6, after control valve 6 unlatchings, can enter the gas storage well storage after compressed unit 5 compressions of the natural gas in the tank car.On the other hand, also compressor bank of the prior art can be used as compressor bank of the present invention through transforming the back, can be reduced the cost that is used to reclaim BOG like this.
In addition, above-mentioned each control valve can be controlled by manual, but for easy to operate, can realize control automatically by PLC, so both be convenient to each control valve is operated, also be convenient to accurately control the switching of each control valve, and then accurately controlled the normal operation of whole BOG reclaiming system.
Claims (5)
1. be used to reclaim the system of the BOG in the LNG storage tank, comprise LNG storage tank (16), it is characterized in that: also comprise gas storage well (15) and compressor bank (5); Described compressor bank (5) is provided with first suction port (9) and first air outlet (12), and first suction port (9) of described compressor bank (5) links to each other with the relief opening of LNG storage tank (16) by outlet pipe (22); Described first air outlet (12) links to each other with the suction port of gas storage well (15) by gas storage well suction tude (17);
Described outlet pipe (22) is provided with knock out drum (1), and knock out drum (1) is provided with the knock out drum pressure-detecting device (20) that is used to detect knock out drum internal pressure value; Described knock out drum (1) is separated to form LNG storage tank outlet pipe (18) and knock out drum outlet pipe (8) with outlet pipe (22), and described knock out drum outlet pipe (8) is provided with knock out drum outlet pipe control valve (2); The relief opening of described LNG storage tank (16) links to each other with the suction port of knock out drum (1) by LNG storage tank outlet pipe (18), and the relief opening of described knock out drum (1) links to each other with first suction port (9) of compressor bank (5) by knock out drum outlet pipe (8);
Also comprise recycling can (4) and be arranged on second air outlet (11) on the compressor bank (5), described second air outlet (11) links to each other with the suction port of recycling can (4) by recycling can suction tude (21); Link to each other with an end of recycling can steam outlet pipe (7) on the pipeline of corresponding knock out drum outlet pipe between described knock out drum outlet pipe control valve (2) and first suction port (9), the other end of described recycling can steam outlet pipe (7) link to each other with the air outlet of recycling can (4) and recycling can steam outlet pipe (7) on recycling can steam outlet pipe control valve (3) is installed.
2. the system that is used to reclaim the BOG in the LNG storage tank as claimed in claim 1, it is characterized in that: described recycling can (4) is provided with the recycling can pressure-detecting device (19) that is used to detect recycling can internal pressure value.
3. the system that is used to reclaim the BOG in the LNG storage tank as claimed in claim 1 or 2 is characterized in that: described compressor bank also is provided with and is used for second suction port (10) that links to each other with tank car (14).
4. be used to reclaim the method for the BOG in the LNG storage tank, it is characterized in that may further comprise the steps:
A, the BOG that discharges in the LNG storage tank (16) is compressed into the BOG of gas storage well with the standard pressure value by compressor bank (5);
B, gas storage well that steps A is obtained enter gas storage well (15) with the BOG of standard pressure value and store;
Described steps A may further comprise the steps:
A1, earlier that LNG storage tank (16) is interior BOG enter knock out drum (1);
A2, when the force value of the BOG in the knock out drum (1) during more than or equal to knock out drum predetermined vent pressure value, compression forms the BOG of gas storage well with the standard pressure value through compressor bank (5) with the BOG in the knock out drum (1) again;
Described steps A 2 may further comprise the steps:
A2-1, when the force value of the BOG in the knock out drum (1) during more than or equal to knock out drum predetermined vent pressure value, the BOG in earlier will knock out drum (1) enters recycling can (4) after through compressor bank (5) compression;
A2-2, then that recycling can (4) is interior BOG compress the BOG of formation gas storage well in back with the standard pressure value through compressor bank (5).
5. the method that is used to reclaim the BOG in the LNG storage tank as claimed in claim 4, it is characterized in that: among the described steps A 2-2, when the force value of the BOG in the recycling can (4) during, the more compressed unit of BOG (5) in the recycling can (4) is compressed into the BOG of gas storage well with the standard pressure value more than or equal to recycling can predetermined vent pressure value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110398207 CN102425725B (en) | 2011-12-05 | 2011-12-05 | System and method for reclaiming boil off gas (BOG) in liquefied natural gas (LNG) storage tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110398207 CN102425725B (en) | 2011-12-05 | 2011-12-05 | System and method for reclaiming boil off gas (BOG) in liquefied natural gas (LNG) storage tank |
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| CN102425725A CN102425725A (en) | 2012-04-25 |
| CN102425725B true CN102425725B (en) | 2013-07-24 |
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| CN105202363A (en) * | 2013-07-24 | 2015-12-30 | 沈军 | Device for recovering liquid residue and gas residue in liquid natural gas transport vehicle tank |
| CN104456071B (en) * | 2014-12-08 | 2016-04-27 | 日照海达尔加气设备有限公司 | A kind of LNG Liquefied natural gas tank car discharge mechanism and method |
| 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 |
| CN106764417A (en) * | 2016-12-20 | 2017-05-31 | 山东新兴重工科技发展有限公司 | A kind of BOG recycling and processing devices |
| CN112596553A (en) * | 2020-11-13 | 2021-04-02 | 河南晶锐冷却技术股份有限公司 | Valve cooling nitrogen pressure stabilizing system for offshore flexible direct current power transmission |
| CN114001280A (en) * | 2021-10-25 | 2022-02-01 | 陕西融科低温设备有限公司 | Energy saver for low-temperature liquid conveying and conveying system |
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| CN202327654U (en) * | 2011-12-05 | 2012-07-11 | 四川金星压缩机制造有限公司 | System for recycling boil-off gas (BOG) in liquefied natural gas (LNG) storage tank |
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| JPH102497A (en) * | 1996-06-18 | 1998-01-06 | Tokyo Gas Co Ltd | Return gas system and return gas return feeding method |
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| JP2011236929A (en) * | 2010-05-06 | 2011-11-24 | Shinko Engineering & Maintenance Co Ltd | Lng satellite facility |
| CN102182919A (en) * | 2011-03-26 | 2011-09-14 | 宁波鲍斯能源装备股份有限公司 | Device and method for recovery and reliquefaction of boil-off gas of liquefied natural gas |
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| CN202327654U (en) * | 2011-12-05 | 2012-07-11 | 四川金星压缩机制造有限公司 | System for recycling boil-off gas (BOG) in liquefied natural gas (LNG) storage tank |
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| CP03 | Change of name, title or address |
Address after: 610036 Yingbin international, No. 19, West 1st Road, Jinniu District, Sichuan, Chengdu Patentee after: SICHUAN JINXING CLEAN ENERGY EQUIPMENT Co.,Ltd. Address before: Jinniu District Golden Road Chengdu city Sichuan province 610036 No. 166 Patentee before: SICHUAN JINXING COMPRESSOR MANUFACTURING Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No.19, Zhenxing West 1st Road, Jinniu District, Chengdu, Sichuan 610036 Patentee after: Sichuan Jinxing Clean Energy Equipment Group Co.,Ltd. Address before: No.19, Zhenxing West 1st Road, Jinniu District, Chengdu, Sichuan 610036 Patentee before: SICHUAN JINXING CLEAN ENERGY EQUIPMENT Co.,Ltd. |