CN109677565B - LNG ship material conveying refrigeration system and refrigeration material conveying method thereof - Google Patents

LNG ship material conveying refrigeration system and refrigeration material conveying method thereof Download PDF

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Publication number
CN109677565B
CN109677565B CN201910011589.8A CN201910011589A CN109677565B CN 109677565 B CN109677565 B CN 109677565B CN 201910011589 A CN201910011589 A CN 201910011589A CN 109677565 B CN109677565 B CN 109677565B
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lng
storage tank
pipe
bog
nitrogen
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CN109677565A (en
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杨德成
邓佳佳
郑中棒
徐荣伟
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Shanghai Hui Ge Environmental Technology Co.,Ltd.
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Zhoushan Bo Rui Ship Science And Technology Development Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/26—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for frozen goods

Abstract

The LNG ship material conveying and freezing system comprises an LNG storage tank, a ship internal combustion engine and a nitrogen storage tank, wherein the ship internal combustion engine is connected with an internal combustion engine exhaust port, and the LNG storage tank (arranged on an LNG ship and characterized in that the LNG storage tank is connected with an LNG conveying inner pipe, the periphery of the LNG conveying inner pipe is further wrapped by an outer protection pipe, a BOG output pipe is connected between the LNG storage tank and the BOG storage tank, and a liquid nitrogen storage tank is arranged below the nitrogen storage tank.

Description

LNG ship material conveying refrigeration system and refrigeration material conveying method thereof
Technical Field
The invention relates to the field of LNG ship transportation, in particular to a BOG recovery system of an LNG ship and an operation method thereof.
Background
Lng (liquefied Natural gas), an acronym for liquefied Natural gas. Natural gas is a combustible gas that is naturally produced in gas fields and is composed primarily of methane. LNG is condensed into liquid by cooling gaseous natural gas to-162 c at atmospheric pressure. The liquefied natural gas can greatly save storage and transportation space, and has the characteristics of large heat value, high performance and the like.
LNG is a clean, efficient energy source. Since the imported LNG contributes to the energy consumption country to realize diversification of energy supply and guarantee energy safety, and the exported LNG contributes to the natural gas production country to effectively develop natural gas resources, increase foreign exchange income, and promote national economic development, the LNG trade is becoming a new hotspot in the global energy market. BOG: boil Off Gas flash, Boil Off Gas. The source of the BOG: after the LNG in a low temperature state is loaded from the liquefaction plant, it is generally transported in an LNG tanker mode, and since the LNG in the tanker is increased in temperature due to heat exchange between unavoidable energy and the outside during storage, transportation, and the like, part of the liquid is vaporized to generate bog (boil off gas) flash gas. The pressure of the storage container is increased after the BOG is formed, when the pressure reaches a certain pressure, the safety valve is opened, and redundant natural gas is discharged to the atmosphere, so that the pressure in the storage tank is relieved, and the explosion danger is avoided.
In the transfer process of LNG, the LNG transport ship can contact heat in the process of transferring the LNG to the LNG dedicated transport tank car, so that serious volatilization and more loss of LNG can be caused.
Disclosure of Invention
In order to overcome the defects, the invention provides the LNG ship material conveying and refrigerating system and the refrigerating and conveying method thereof.
The technical scheme adopted by the invention is as follows:
the LNG shipping conveying and freezing system comprises an LNG storage tank, a shipping internal combustion engine and a nitrogen storage tank, wherein the shipping internal combustion engine is connected with an internal combustion engine exhaust port, and the LNG storage tank (arranged on an LNG shipping vessel is characterized in that the LNG storage tank is connected with an LNG conveying inner pipe, the periphery of the LNG conveying inner pipe is further wrapped by an outer protection pipe, a BOG output pipe is connected between the LNG storage tank and the BOG storage tank, and a liquid nitrogen storage tank is arranged below the nitrogen storage tank;
install band pulley one, band pulley two, secondary pulley and main shaft pole on the boats and ships internal-combustion engine respectively, wherein: the ship internal combustion engine drives a belt wheel II to rotate, a toothed V belt is connected among the belt wheel I, the belt wheel II and a main shaft rod, the toothed V belt is meshed with an auxiliary belt wheel, and the belt wheel I is further connected with a transmission shaft which penetrates through the ship internal combustion engine and extends to the other side of the ship internal combustion engine; the transmission shaft is uniformly provided with a second cam, a BOG piston air compressor arranged on the BOG storage tank is arranged below the second cam, and a first piston pump is arranged on the side edge of the second cam, wherein: the first piston pump and the nitrogen storage tank are connected with a first nitrogen input pipe, and a nitrogen supply pipe is connected between the first piston pump and the LNG conveying inner pipe; a liquid BOG output pipe is connected between the BOG piston air compressor and the liquid BOG storage tank, and a liquid BOG supply pipe is connected between the BOG storage tank and the ship internal combustion engine;
a piston pump II driven by a cam to reciprocate is uniformly arranged on the main shaft rod; the second piston pump is connected with a liquid nitrogen supply pipe connected between the outer protection pipe and the LNG conveying inner pipe, a liquid nitrogen input pipe is connected between the liquid nitrogen storage tank and the second piston pump, the tail end of the outer protection pipe is connected with a liquid nitrogen recovery pipe, a control valve I is installed on the liquid nitrogen recovery pipe, the liquid nitrogen recovery pipe is also connected with a recovery pump, and the recovery pump is connected with a liquid nitrogen return pipe connected with the liquid nitrogen storage tank; the LNG conveying inner pipe is provided with a discharge port, a second control valve is installed on the discharge port, a nitrogen backflow pipe is connected between the discharge port and the nitrogen storage tank, the nitrogen backflow pipe is further provided with an air pump, and the discharge port is arranged on the conveying frame.
Another embodiment of the present invention further comprises a plurality of shafts arranged up and down, wherein the shafts are in mutual meshing transmission through gears, and wherein: a conveyor belt is connected between the shaft lever at the top and the auxiliary pulley, and the shaft lever at the bottom is connected with a motor.
Based on the device, the invention also provides a freezing and material conveying method of the LNG ship material conveying and freezing system, which is characterized by comprising the following steps:
1) in the transportation process of the LNG ship, a ship internal combustion engine of the ship operates, BOG generated in the transportation process of the LNG storage tank is directly conveyed into the BOG storage tank through a BOG output pipe in a vapor state, and then the ship internal combustion engine drives a belt pulley to rotate through a toothed V belt to drive a transmission shaft to rotate through a driving belt pulley II;
2) the transmission shaft drives the cam II to rotate and simultaneously acts on the piston pump I and the BOG piston air compressor, so that the BOG piston air compressor pressurizes the vapor BOG in the BOG storage tank to change the vapor BOG into liquid BOG, the vapor BOG is sent into the BOG storage tank through a liquid BOG output pipe, and the BOG storage tank sends LNG into a ship internal combustion engine for use through a liquid BOG supply pipe;
3) when the LNG storage tank needs to be unloaded, firstly pumping out nitrogen in the nitrogen storage tank through the piston pump I, then continuously reciprocating the piston pump I under the action of the cam II to pump out the nitrogen and press the nitrogen into the nitrogen supply pipe while pumping out the nitrogen, and sending the nitrogen into the LNG conveying inner pipe to cool the inside of the LNG conveying inner pipe in advance;
4) the main shaft rod is driven to rotate by the toothed V belt, so that the cam drives the piston pump II to do reciprocating motion to pump liquid nitrogen out of the liquid nitrogen storage tank into the liquid nitrogen input pipe, then the liquid nitrogen passes through the piston pump II and then is sent into a low-temperature layer between the outer protection pipe and the LNG conveying inner pipe through the liquid nitrogen supply pipe, and the cooling is finished at the moment;
5) connecting the nitrogen return pipe with a discharge port, opening a second control valve, starting an air pump to start pumping nitrogen in the LNG conveying inner pipe back into the nitrogen storage tank, separating the nitrogen return pipe from the discharge port, and connecting the discharge port with a feed pipeline of the LNG tank truck;
6) the LNG in the LNG storage tank is transferred into the LNG tank car, and in the process, the low-temperature layer formed between the outer protection tube and the LNG conveying inner tube keeps the LNG conveying inner tube in a low-temperature environment, so that the LNG cannot be evaporated and lost in the conveying process;
7) after LNG transmission is accomplished, open control flap one, retrieve the liquid nitrogen between outer protection tube and the LNG transport inner tube through the recovery pump, send back to in the liquid nitrogen storage tank through the liquid nitrogen back flow.
The LNG transfer device has the advantages that the transfer device can freeze a material conveying pipeline in the LNG transfer process, so that a low-temperature layer is formed in the pipeline, the LNG transfer process is prevented from volatilizing when being heated, loss is reduced, and the transfer device is suitable for popularization and use.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a LNG ship feed refrigeration system according to the present invention;
FIG. 2 is a further exploded view of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic view of the invention in another view orientation of FIG. 2;
FIG. 4 is a schematic view of the invention in another view orientation of FIG. 1;
fig. 5 is a schematic front view of the structure of fig. 2 according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in the figure, the LNG ship material conveying and freezing system comprises an LNG storage tank 28, a ship internal combustion engine 13 and a nitrogen storage tank 23, wherein the ship internal combustion engine 13 is connected with an internal combustion engine exhaust port 4, the LNG storage tank 28 is arranged on an LNG ship, the LNG storage tank 28 is connected with an LNG conveying inner pipe 40, the periphery of the LNG conveying inner pipe 40 is further wrapped with an outer protection pipe 19, a double-layer pipe is formed, a heat insulation layer is further arranged on the outer protection pipe 19, a BOG output pipe 27 is further connected between the LNG storage tank 28 and the BOG storage tank 10, and a liquid nitrogen storage tank 24 is arranged below the nitrogen storage tank 23;
the marine internal combustion engine 13 is respectively provided with a first belt wheel 30, a second belt wheel 31, an auxiliary belt wheel 35 and a main shaft rod 41, wherein: the marine internal combustion engine 13 drives the second belt wheel 31 to rotate, a toothed V belt 32 is connected among the first belt wheel 30, the second belt wheel 31 and the main shaft rod 41, the toothed V belt 32 is meshed with the secondary belt wheel 35, and the first belt wheel 30 is further connected with a transmission shaft 11 which penetrates through the marine internal combustion engine 13 and extends to the other side of the marine internal combustion engine (13); the transmission shaft 11 is uniformly provided with a second cam 8, a BOG piston air compressor 9 arranged on a BOG storage tank 10 is arranged below the second cam 8, and a first piston pump 7 is arranged on the side edge of the second cam 8, wherein: the first piston pump 7 and the nitrogen storage tank 23 are connected with a first nitrogen input pipe 12, and a nitrogen supply pipe 15 is connected between the first piston pump 7 and the LNG conveying inner pipe 40; a liquid BOG output pipe 26 is connected between the BOG piston air compressor 9 and the liquid BOG storage tank 25, and a liquid BOG supply pipe 14 is connected between the BOG storage tank 25 and the ship internal combustion engine 13.
A second piston pump 36 driven by a first cam 42 to reciprocate is uniformly arranged on the main shaft rod 41; the second piston pump 36 is connected with a liquid nitrogen supply pipe 16 connected between an outer protection pipe 19 and an LNG conveying inner pipe 40, a liquid nitrogen input pipe 22 is connected between a liquid nitrogen storage tank 24 and the second piston pump 36, the tail end of the outer protection pipe 19 is connected with a liquid nitrogen recovery pipe 18, a first control valve 45 is installed on the liquid nitrogen recovery pipe 18, the liquid nitrogen recovery pipe 18 is further connected with a recovery pump 17, and the recovery pump 17 is connected with a liquid nitrogen return pipe 20 connected with the liquid nitrogen storage tank 24; the LNG conveying inner pipe 40 is provided with a discharge port 1, the discharge port 1 is provided with a control valve II 46, a nitrogen return pipe 21 is connected between the discharge port 1 and the nitrogen storage tank 23, the nitrogen return pipe 21 is detachably mounted, the nitrogen is required to be recovered and is mounted and connected, the nitrogen is not required to be removed, the nitrogen return pipe 21 is further provided with an air pump, and the discharge port 1 is arranged on the conveying frame 2.
Based on the device, the invention also provides a freezing and material conveying method of the LNG ship material conveying and freezing system, which is characterized by comprising the following steps:
1) in the transportation process of the LNG ship, a ship internal combustion engine 13 of the ship runs, BOG generated by the transportation of an LNG storage tank 28 is directly conveyed into a BOG storage tank 10 through a BOG output pipe 27 in a vapor state, and then the ship internal combustion engine 13 drives a belt wheel 30 to rotate through a toothed V belt 32 by driving a belt wheel II 31 to rotate so as to rotate a transmission shaft 11;
2) the transmission shaft 11 drives the cam II 8 to rotate and simultaneously acts on the piston pump I7 and the BOG piston air compressor 9, so that the BOG piston air compressor 9 pressurizes the vapor BOG in the BOG storage tank 10 to change the vapor BOG into liquid, the vapor BOG is sent into the BOG storage tank 25 through a liquid BOG output pipe 26, and the BOG storage tank 25 sends LNG into the internal combustion engine 13 of the ship through a liquid BOG supply pipe 14 for use;
3) when the LNG storage tank 28 needs to be unloaded, firstly, the nitrogen in the nitrogen storage tank 23 is pumped out through the piston pump I7, and then under the action of the cam II 8, the piston pump I7 continuously reciprocates to pump out the nitrogen and press the nitrogen into the nitrogen supply pipe 15 at the same time so as to send the nitrogen into the LNG conveying inner pipe 40 to perform early temperature reduction on the inside of the pipe;
4) the main shaft rod 41 is driven to rotate by the toothed V belt 32, so that the cam I42 drives the piston pump II 36 to reciprocate, liquid nitrogen is pumped into the liquid nitrogen input pipe 22 from the liquid nitrogen storage tank 24, passes through the piston pump II 36 and then is sent into a space between the outer protection pipe 19 and the LNG conveying inner pipe 40 through the liquid nitrogen supply pipe 16 to form a low-temperature layer, and the temperature reduction is finished;
5) connecting the nitrogen return pipe 21 with the discharge port 1, opening the second control valve 46, starting a suction pump to begin to suck nitrogen in the LNG conveying inner pipe 40 back into the nitrogen storage tank 23, then separating the nitrogen return pipe 21 from the discharge port 1, and then connecting the discharge port 1 with a feed pipeline of an LNG tank car;
6) the LNG in the LNG storage tank 28 is transferred to the LNG tank car, and in the process, the low-temperature layer formed between the outer protection pipe 19 and the LNG conveying inner pipe 40 keeps the LNG conveying inner pipe 40 in a low-temperature environment, so that the LNG cannot be evaporated and lost in the conveying process;
7) after the LNG is transferred, the first control valve 45 is opened, liquid nitrogen between the outer protection tube 19 and the LNG conveying inner tube 40 is recovered through the recovery pump 17 and is sent back to the liquid nitrogen storage tank 24 through the liquid nitrogen return tube 20.
Example 2
As shown in the figure, the LNG ship material conveying and freezing system comprises an LNG storage tank 28, a ship internal combustion engine 13 and a nitrogen storage tank 23, wherein the ship internal combustion engine 13 is connected with an internal combustion engine exhaust port 4, the LNG storage tank 28 is arranged on an LNG ship, the LNG storage tank 28 is connected with an LNG conveying inner pipe 40, the periphery of the LNG conveying inner pipe 40 is further wrapped with an outer protection pipe 19, a double-layer pipe is formed, a heat insulation layer is further arranged on the outer protection pipe 19, a BOG output pipe 27 is further connected between the LNG storage tank 28 and the BOG storage tank 10, and a liquid nitrogen storage tank 24 is arranged below the nitrogen storage tank 23;
the marine internal combustion engine 13 is respectively provided with a first belt wheel 30, a second belt wheel 31, an auxiliary belt wheel 35 and a main shaft rod 41, wherein: the marine internal combustion engine 13 drives the second belt wheel 31 to rotate, a toothed V belt 32 is connected among the first belt wheel 30, the second belt wheel 31 and the main shaft rod 41, the toothed V belt 32 is meshed with the secondary belt wheel 35, and the first belt wheel 30 is further connected with a transmission shaft 11 which penetrates through the marine internal combustion engine 13 and extends to the other side of the marine internal combustion engine 13; the transmission shaft 11 is uniformly provided with a second cam 8, a BOG piston air compressor 9 arranged on a BOG storage tank 10 is arranged below the second cam 8, and a first piston pump 7 is arranged on the side edge of the second cam 8, wherein: the first piston pump 7 and the nitrogen storage tank 23 are connected with a first nitrogen input pipe 12, and a nitrogen supply pipe 15 is connected between the first piston pump 7 and the LNG conveying inner pipe 40; a liquid BOG output pipe 26 is connected between the BOG piston air compressor 9 and the liquid BOG storage tank 25, and a liquid BOG supply pipe 14 is connected between the BOG storage tank 25 and the ship internal combustion engine 13.
A second piston pump 36 driven by a first cam 42 to reciprocate is uniformly arranged on the main shaft rod 41; the second piston pump 36 is connected with a liquid nitrogen supply pipe 16 connected between an outer protection pipe 19 and an LNG conveying inner pipe 40, a liquid nitrogen input pipe 22 is connected between a liquid nitrogen storage tank 24 and the second piston pump 36, the tail end of the outer protection pipe 19 is connected with a liquid nitrogen recovery pipe 18, a first control valve 45 is installed on the liquid nitrogen recovery pipe 18, the liquid nitrogen recovery pipe 18 is further connected with a recovery pump 17, and the recovery pump 17 is connected with a liquid nitrogen return pipe 20 connected with the liquid nitrogen storage tank 24; the LNG conveying inner pipe 40 is provided with a discharge port 1, the discharge port 1 is provided with a control valve II 46, a nitrogen return pipe 21 is connected between the discharge port 1 and the nitrogen storage tank 23, the nitrogen return pipe 21 is detachably mounted, the nitrogen is required to be recovered and is mounted and connected, the nitrogen is not required to be removed, the nitrogen return pipe 21 is further provided with an air pump, and the discharge port 1 is arranged on the conveying frame 2.
When the ship is in a berthing state, the internal combustion engine 13 of the ship is not operated, therefore, the embodiment also comprises a plurality of shafts 29 which are arranged up and down, the shafts 29 are mutually meshed and driven through the gear 5, wherein: a conveyor belt (34) is connected between the topmost shaft rod and the auxiliary pulley 35, and the bottommost shaft rod is connected with a motor.
Based on the device, the invention also provides a freezing and material conveying method of the LNG ship material conveying and freezing system, which is characterized by comprising the following steps:
1) when the LNG ship is in shore and the internal combustion engine 13 of the ship does not work, the motor drives the shaft lever at the bottommost part to rotate at the moment, the plurality of shaft levers 29 are linked through the mutual meshing transmission of the gears 5, the belt pulley I30 is driven to rotate through the toothed V belt 32, the transmission shaft 11 is driven to rotate, and BOG generated by the transportation of the LNG storage tank 28 is in a vapor state and is directly sent into the BOG storage tank 10 through the BOG output pipe 27;
2) the transmission shaft 11 drives the cam II 8 to rotate and simultaneously acts on the piston pump I7 and the BOG piston air compressor 9, so that the BOG piston air compressor 9 pressurizes the vapor BOG in the BOG storage tank 10 to change the vapor BOG into liquid BOG, and the vapor BOG is sent into the BOG storage tank 25 through a liquid BOG output pipe 26 to be stored;
3) when the LNG storage tank 28 needs to be unloaded, firstly, the nitrogen in the nitrogen storage tank 23 is pumped out through the piston pump I7, and then under the action of the cam II 8, the piston pump I7 continuously reciprocates to pump out the nitrogen and press the nitrogen into the nitrogen supply pipe 15 at the same time so as to send the nitrogen into the LNG conveying inner pipe 40 to perform early temperature reduction on the inside of the pipe;
4) the main shaft rod 41 is driven to rotate by the toothed V belt 32, so that the cam I42 drives the piston pump II 36 to reciprocate, liquid nitrogen is pumped into the liquid nitrogen input pipe 22 from the liquid nitrogen storage tank 24, passes through the piston pump II 36 and then is sent into a space between the outer protection pipe 19 and the LNG conveying inner pipe 40 through the liquid nitrogen supply pipe 16 to form a low-temperature layer, and the temperature reduction is finished;
5) connecting the nitrogen return pipe 21 with the discharge port 1, opening the second control valve 46, starting a suction pump to start to suck the inner nitrogen of the LNG conveying inner pipe 40 back into the nitrogen storage tank 23, then separating the nitrogen return pipe 21 from the discharge port 1, and then connecting the discharge port 1 with a feed pipeline of an LNG tank car;
6) the LNG in the LNG storage tank 28 is transferred to the LNG tank car, and in the process, the low-temperature layer formed between the outer protection pipe 19 and the LNG conveying inner pipe 40 keeps the LNG conveying inner pipe 40 in a low-temperature environment, so that the LNG cannot be evaporated and lost in the conveying process;
7) after the LNG is transferred, the first control valve 45 is opened, liquid nitrogen between the outer protection tube 19 and the LNG conveying inner tube 40 is recovered through the recovery pump 17 and is sent back to the liquid nitrogen storage tank 24 through the liquid nitrogen return tube 20.
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventive concepts using the present invention are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.

Claims (3)

  1. The LNG ship material conveying and refrigerating system comprises an LNG storage tank (28), a ship internal combustion engine (13) and a nitrogen storage tank (23), wherein an internal combustion engine exhaust port (4) is connected to the ship internal combustion engine (13), and the LNG storage tank (28) is arranged on an LNG ship and is characterized in that: an LNG storage tank (28) is connected with an LNG conveying inner pipe (40), the periphery of the LNG conveying inner pipe (40) is further wrapped by an outer protection pipe (19), a BOG output pipe (27) is further connected between the LNG storage tank (28) and the BOG storage tank (10), and a liquid nitrogen storage tank (24) is mounted below a nitrogen storage tank (23);
    the marine internal combustion engine (13) is provided with a first belt wheel (30), a second belt wheel (31), an auxiliary belt wheel (35) and a main shaft rod (41), wherein: the marine internal combustion engine (13) drives a second belt wheel (31) to rotate, a toothed V belt (32) is connected among the first belt wheel (30), the second belt wheel (31) and a main shaft rod (41), the toothed V belt (32) is meshed with a secondary belt wheel (35), and the first belt wheel (30) is further connected with a transmission shaft (11) which penetrates through the marine internal combustion engine (13) and extends to the other side of the marine internal combustion engine (13); cam two (8) are installed to the equipartition on transmission shaft (11), the below of cam two (8) is equipped with BOG piston air compressor machine (9) of installing on BOG holding vessel (10), and the side of cam two (8) is equipped with piston pump (7), wherein: a first nitrogen input pipe (12) is connected between the first piston pump (7) and the nitrogen storage tank (23), and a nitrogen supply pipe (15) is connected between the first piston pump (7) and the LNG conveying inner pipe (40);
    a liquid BOG output pipe (26) is connected between the BOG piston air compressor (9) and the liquid BOG storage tank (25), and a liquid BOG supply pipe (14) is connected between the BOG storage tank (25) and the ship internal combustion engine (13); a second piston pump (36) driven by a first cam (42) to reciprocate is uniformly arranged on the main shaft rod (41); the LNG storage device is characterized in that the second piston pump (36) is connected with a liquid nitrogen supply pipe (16) connected between an outer protection pipe (19) and an LNG conveying inner pipe (40), a liquid nitrogen input pipe (22) is connected between a liquid nitrogen storage tank (24) and the second piston pump (36), the tail end of the outer protection pipe (19) is connected with a liquid nitrogen recovery pipe (18), a first control valve (45) is installed on the liquid nitrogen recovery pipe (18), the liquid nitrogen recovery pipe (18) is further connected with a recovery pump (17), and the recovery pump (17) is connected with a liquid nitrogen return pipe (20) connected with the liquid nitrogen storage tank (24);
    the LNG conveying inner pipe (40) is provided with a discharge port (1), the discharge port (1) is provided with a second control valve (46), a nitrogen return pipe (21) is connected between the discharge port (1) and the nitrogen storage tank (23), the nitrogen return pipe (21) is further provided with an air suction pump, and the discharge port (1) is arranged on the conveying frame (2).
  2. 2. The LNG ship transport refrigeration system of claim 1, wherein: the device also comprises a plurality of shafts (29) which are arranged up and down, wherein the shafts (29) are mutually meshed and driven through gears (5), and the device is characterized in that: a conveyor belt (34) is connected between the topmost shaft lever and the auxiliary pulley (35), and the bottommost shaft lever is connected with a motor.
  3. The freezing and material conveying method of the LNG ship material conveying and freezing system is characterized by comprising the following steps of:
    1) in the transportation process of the LNG ship, a ship internal combustion engine (13) of the ship operates, BOG generated by the transportation of an LNG storage tank (28) is in a vapor state and is directly sent into a BOG storage tank (10) through a BOG output pipe (27), and then the ship internal combustion engine (13) rotates through a driving belt wheel II (31) and drives a belt wheel I (30) to rotate through a toothed V belt (32) so as to enable a transmission shaft (11) to rotate;
    2) the transmission shaft (11) drives the cam II (8) to rotate and simultaneously acts on the piston pump I (7) and the BOG piston air compressor (9), so that the BOG piston air compressor (9) pressurizes the vapor BOG in the BOG storage tank (10) to change the vapor BOG into liquid, the vapor BOG is sent into the BOG storage tank (25) through a liquid BOG output pipe (26), and the BOG storage tank (25) sends LNG into the internal combustion engine (13) of the ship for use through a liquid BOG supply pipe (14);
    3) when the LNG storage tank (28) needs to be unloaded, firstly, nitrogen in the nitrogen storage tank (23) is pumped out through the piston pump I (7), and then under the action of the cam II (8), the piston pump I (7) continuously reciprocates to pump out the nitrogen and press the nitrogen into the nitrogen supply pipe (15) at the same time so as to send the nitrogen into the LNG conveying inner pipe (40) to perform early temperature reduction on the inside of the pipe;
    4) the main shaft rod (41) is driven to rotate by the toothed V belt (32), so that the cam I (42) drives the piston pump II (36) to do reciprocating motion, liquid nitrogen is pumped out of the liquid nitrogen storage tank (24) into the liquid nitrogen input pipe (22), passes through the piston pump II (36), is sent into a space between the outer protection pipe (19) and the LNG conveying inner pipe (40) through the liquid nitrogen supply pipe (16) to form a low-temperature layer, and the temperature reduction is finished;
    5) connecting the nitrogen return pipe (21) with the discharge port (1), opening a second control valve (46), starting an air pump to begin to pump nitrogen in the LNG conveying inner pipe (40) back into the nitrogen storage tank (23), then separating the nitrogen return pipe (21) from the discharge port (1), and then connecting the discharge port (1) with a feed pipeline of the LNG tank car;
    6) the LNG in the LNG storage tank (28) is transferred into the LNG tank car, and in the process, a low-temperature layer formed between the outer protection pipe (19) and the LNG conveying inner pipe (40) keeps the LNG conveying inner pipe (40) in a low-temperature environment all the time, so that the LNG cannot be evaporated and lost in the conveying process;
    7) after LNG transmission is completed, a first control valve (45) is opened, liquid nitrogen between the outer protection tube (19) and the LNG conveying inner tube (40) is recovered through a recovery pump (17), and the liquid nitrogen is sent back to the liquid nitrogen storage tank (24) through a liquid nitrogen return tube (20).
CN201910011589.8A 2019-01-07 2019-01-07 LNG ship material conveying refrigeration system and refrigeration material conveying method thereof Active CN109677565B (en)

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