CN113443116A - Liquefied gas transport ship and ventilation method for cargo-air cabin of liquefied gas transport ship - Google Patents

Liquefied gas transport ship and ventilation method for cargo-air cabin of liquefied gas transport ship Download PDF

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Publication number
CN113443116A
CN113443116A CN202010219282.XA CN202010219282A CN113443116A CN 113443116 A CN113443116 A CN 113443116A CN 202010219282 A CN202010219282 A CN 202010219282A CN 113443116 A CN113443116 A CN 113443116A
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CN
China
Prior art keywords
ventilation
cargo
liquefied gas
tank
main pipe
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CN202010219282.XA
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Chinese (zh)
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CN113443116B (en
Inventor
刘瑞忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nantong Cimc Pacific Ocean Marine Engineering Co ltd
China International Marine Containers Group Co Ltd
CIMC Enric Investment Holdings Shenzhen Co Ltd
Original Assignee
Nantong Cimc Pacific Ocean Marine Engineering Co ltd
China International Marine Containers Group Co Ltd
CIMC Enric Investment Holdings Shenzhen Co Ltd
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Application filed by Nantong Cimc Pacific Ocean Marine Engineering Co ltd, China International Marine Containers Group Co Ltd, CIMC Enric Investment Holdings Shenzhen Co Ltd filed Critical Nantong Cimc Pacific Ocean Marine Engineering Co ltd
Priority to CN202010219282.XA priority Critical patent/CN113443116B/en
Publication of CN113443116A publication Critical patent/CN113443116A/en
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Publication of CN113443116B publication Critical patent/CN113443116B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/02—Ventilation; Air-conditioning
    • B63J2/10—Ventilating-shafts; Air-scoops
    • 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
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/02—Ventilation; Air-conditioning
    • B63J2/08—Ventilation; Air-conditioning of holds

Abstract

The invention provides a liquefied gas transport ship and a ventilation method of a cargo-air cabin of the liquefied gas transport ship. The liquefied gas transport ship comprises a liquid cargo tank, a liquid tank, a ventilation pipeline system and a fan. The top of the liquid cargo tank is provided with an opening, and the opening is provided with an openable hatch cover; the liquid tank is correspondingly positioned in the liquid cargo tank; a gap is arranged between the liquid tank and the liquid cargo tank to form an empty cargo tank; the ventilation pipeline system comprises a ventilation main pipe and a ventilation branch pipe; the ventilation main pipe is fixed at the other end, opposite to the opening, in the cargo-air cabin, the bottom end of the ventilation main pipe extends to the lower part of the liquid tank, the top end of the ventilation main pipe penetrates through the top of the cargo tank, the ventilation branch pipe is fixed in the cargo-air cabin, one end of the ventilation branch pipe is communicated with the ventilation main pipe, and the other end of the ventilation branch pipe extends towards the opening; the fan is arranged corresponding to the ventilation main pipe and fixed on the deck; the top port of the ventilation main pipe is sealed by a detachable flange cover or is detachably connected to the fan so as to communicate the fan with the opening, and gas in the cargo space is discharged outwards to promote outside air to enter the cargo space.

Description

Liquefied gas transport ship and ventilation method for cargo-air cabin of liquefied gas transport ship
Technical Field
The invention relates to the technical field of ships, in particular to a liquefied gas transport ship and a ventilation method of an empty cargo compartment of the liquefied gas transport ship.
Background
The liquefied gas carrier is mainly used for transporting Liquefied Petroleum Gas (LPG), Liquefied Natural Gas (LNG), petrochemicals (ethane, butane, ethylene, vinyl chloride monomer, etc.), chemical gas, liquid ammonia, and the like. The liquefied gas carrier mainly comprises a cargo tank, a liquid tank is arranged in the cargo tank, and a space is arranged between the liquid tank and a bulkhead of the cargo tank to form an empty cargo tank.
Classification society regulations and IGC codes specifically require that the cargo hold be ventilated before crew members can enter. At present, the ventilation of cargo and air cabins adopts a movable ventilation system with a hydraulic or gas-driving fan matched with a hose. However, the movable ventilation system has the problems that the ventilation efficiency is low, the arrangement cannot be met according to the requirement of the ventilation times in a new specification, and the like.
Disclosure of Invention
The invention aims to provide a liquefied gas transport ship and a ventilation method of an empty cargo tank thereof, which have higher ventilation efficiency and meet the requirements of new specifications, so as to solve the problems in the prior art.
In order to solve the above technical problems, the present invention provides a liquefied gas carrier, comprising: the top of the liquid cargo tank is provided with an opening, and the opening is provided with an openable hatch cover; the liquid tank is correspondingly positioned in the liquid cargo tank; a space is arranged between the liquid tank and the liquid cargo tank to form an empty cargo tank; the ventilation pipeline system is arranged corresponding to the cargo hold; the ventilation pipeline system comprises a ventilation main pipe and a ventilation branch pipe; the ventilation main pipe is fixed at the other end, opposite to the opening, in the cargo-air cabin, the bottom end of the ventilation main pipe extends to the lower part of the liquid tank, the top end of the ventilation main pipe penetrates through the top of the cargo tank, the ventilation branch pipe is fixed in the cargo-air cabin, one end of the ventilation branch pipe is communicated with the ventilation main pipe, and the other end of the ventilation branch pipe extends towards the opening; the fan is arranged corresponding to the ventilation main pipe and is fixed on a deck of the liquefied gas transport ship; the port department at ventilation house steward top is sealed through the detachable blind flange or detachably is connected to the fan, in order with be linked together between the fan with the opening, make the gas is outwards discharged in the goods empty cabin and impels the outside air to get into in the goods empty cabin.
In one embodiment, the port at the top end of the ventilation manifold communicates with the blower via a hose.
In one embodiment, the top end of the ventilation manifold extends through the top of the cargo tank and onto the deck with the port at the top end of the ventilation manifold being located above the deck.
In one embodiment, a plurality of the ventilation branch pipes are arranged at intervals along the length direction of the ventilation main pipe.
In one embodiment, a plurality of through holes are formed in the side wall of the ventilation main pipe and are arranged at intervals along the length direction of the ventilation main pipe, a steel wire mesh covers at each through hole, and the ventilation branch pipes are connected to the through holes in a one-to-one correspondence mode to achieve communication with the ventilation main pipe.
In one embodiment, the aperture of the ventilation manifold decreases from top to bottom along its length.
In one embodiment, the ventilation main pipe comprises a top pipe section, at least one middle pipe section and a bottom pipe section which are sequentially connected along the length direction of the ventilation main pipe, the caliber of the top pipe section is larger than that of the middle pipe section and that of the bottom pipe section, respectively, and the caliber of the middle pipe section is larger than that of the bottom pipe section.
In one embodiment, the bottom tube section is located below the tank and extends horizontally.
In one embodiment, the ventilation pipeline system comprises a plurality of ventilation main pipes arranged at intervals along the width direction of the liquefied gas carrier, and a plurality of ventilation branch pipes corresponding to the ventilation main pipes.
In one embodiment, the fan is an explosion-proof axial flow fan.
The invention also provides a ventilation method for the cargo-air cabin of the liquefied gas carrier, wherein the liquefied gas carrier adopts the liquefied gas carrier, and the ventilation method comprises the following steps:
connecting a port at the top end of the ventilation main pipe with the fan;
opening the hatch;
and starting the fan to discharge the gas in the cargo-air cabin outwards to promote the outside air to enter the cargo-air cabin, thereby realizing ventilation.
According to the technical scheme, the invention has the advantages and positive effects that:
the liquefied gas carrier comprises a liquid cargo tank, a liquid tank, a ventilation pipeline system and a fan. The ventilation main pipe and the ventilation branch pipes of each ventilation pipeline system are located in the cargo space, one end of each ventilation branch pipe is communicated with the air main pipe, the other end of each ventilation branch pipe extends towards the opening of the cargo space, an airflow path is optimized, the ventilation main pipe is communicated with the fan, external air can enter the cargo space quickly and completely, dangerous gas in the cargo space is discharged quickly, the ventilation efficiency is improved, and therefore the requirement of new specifications of a classification society on ventilation can be met. And the liquefied gas carrier does not need crew to carry the fan to arrange and install, thereby saving time and further improving efficiency.
The fan is installed on the deck, need not the crew transport, and then has avoided the crew to take place the risk of accident in handling, has guaranteed crew's safety.
Drawings
Fig. 1 is a side view of one embodiment of a liquefied gas carrier according to the present invention;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a top view of one embodiment of a liquefied gas carrier of the present invention;
fig. 4 is a schematic top view of a portion of one embodiment of a liquefied gas carrier vessel according to the present invention.
Wherein the reference numerals are as follows: 1. a liquefied gas carrier; 11. a cargo tank; 111. an opening; 12. a liquid tank; 13. a cargo space; 141. a ventilation main pipe; 1411. a top tube section; 1412. an intermediate first pipe section; 1413. an intermediate second tube section; 1414. a bottom pipe section; 142. a ventilation branch pipe; 143. a stainless steel wire mesh; 15. a fan; 16. a hose.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
The present invention provides a liquefied gas carrier ship 1 for transporting Liquefied Petroleum Gas (LPG), Liquefied Natural Gas (LNG), petrochemical products (ethane, butane, ethylene, vinyl chloride monomer, etc.), chemical gas, liquid ammonia, and the like.
Referring to fig. 1 and 3, a liquefied gas carrier 1 mainly includes a deck, a cargo tank 11, a liquid tank 12, a ventilation pipe system, and a fan 15.
The cargo tank 11 is located below the deck. In this embodiment, the number of the cargo tanks 11 is three, and the cargo tanks are arranged at intervals in the longitudinal direction of the liquefied gas carrier ship 1. In other embodiments, the number of cargo tanks 11 may be set according to the actual situation. Each cargo tank 11 includes a plurality of bulkheads, namely a front bulkhead, a rear bulkhead, and a top bulkhead, which enclose a space, i.e., the cargo tank 11.
An opening 111 is opened at the top of each cargo tank 11, that is, an opening 111 is opened in a top bulkhead, and an openable and closable hatch is provided at the opening 111. When the liquefied gas carrier ship 1 is underway, the hatch cover is closed to maintain the sealing performance of the cargo tank 11; when ventilation is required, the hatch is opened. In this embodiment, the opening 111 is provided at an end of each cargo tank 11 near the bow.
The liquid tank 12 is placed in the cargo tank 11 and is used to carry Liquefied Petroleum Gas (LPG), Liquefied Natural Gas (LNG), petrochemicals (ethane, butane, ethylene, vinyl chloride monomer, etc.), chemical gas, liquid ammonia, and the like. In this embodiment, the liquid tanks 12 are disposed corresponding to the liquid cargo tank 11, that is, the number of the liquid tanks 12 is also three, and one liquid tank 12 is placed in one liquid cargo tank 11. Specifically, the longitudinal direction of the tank 12 extends in the longitudinal direction of the liquefied gas carrier 1.
The tank 12 is spaced from the walls of the tank 11 to form an empty cargo tank 13. The cargo tank 13 is used for an operator to operate and inspect accessories such as valves in the cargo tank 11. The number of cargo-air tanks 13 corresponds to the number of liquid tanks 12 and cargo tanks 11, i.e. the number of cargo-air tanks 13 is also three.
The ventilation pipeline system and the fan 15 are matched to ventilate the cargo hold 13, so that the air in the cargo hold 13 is ensured, and the safety of operators is further ensured.
The ventilation pipe system is arranged corresponding to the cargo hold 13, that is, the number of the ventilation pipe system is three, and the ventilation pipe system is arranged corresponding to the three cargo hold 13. Therefore, the plurality of independent cargo compartments 13 can be ventilated at the same time, and the ventilation efficiency is greatly improved.
The ventilation pipe system includes a ventilation manifold 141 and ventilation branches.
A ventilation manifold 141 is secured within the cargo space 13 and has a top end extending through the top wall of the tank 11 and onto the deck and a bottom end extending below the tank 12.
Referring to FIG. 2, the ventilation manifold 141 includes a top section 1411, a middle section, and a bottom section 1414 that are sequentially connected along their lengths.
The top end of the top pipe section 1411 extends out of the deck and has an interface at the top end. In this embodiment the top end of the top pipe section 1411 is located above the cargo tank 11 and near the stern end. The top pipe section 1411 extends in the height direction of the tank 12 with its bottom end located in the cargo tank 13. A first throughbore is formed in the top tube section 1411 adjacent the side wall of the tank 12. The first through hole is covered with a stainless steel wire mesh 143.
In this embodiment, along the length direction of the liquefied gas carrier 1, the top pipe sections 1411 of the two ventilation pipe systems located at the bow and the stern extend vertically, and the top pipe section 1411 of the ventilation pipe system located in the middle extends obliquely, so that the part of the top end of the top pipe section 1411 extending out of the top bulkhead and the deck avoids other equipment on the liquefied gas carrier 1.
Further, a plurality of reinforcing ribs are provided between the top tube section 1411 and the top wall of the tank 11. A plurality of stiffeners are spaced along the periphery of the top pipe section 1411 and the stiffeners are located above the top bulkhead.
The number of intermediate pipe sections can be set according to practice. In this embodiment, the intermediate tube segment includes two tube segments, an intermediate first tube segment 1412 and an intermediate second tube segment 1413. In other embodiments, the number of the middle pipe sections can also be three, four or other numbers, and is set according to actual needs.
The top end of the intermediate first tube segment 1412 is positioned at the bottom of the top tube segment 1411 and communicates with the bottom end of the top tube segment 1411, such that the intermediate first tube segment 1412 communicates with the top tube segment 1411. The intermediate first pipe section 1412 extends in the height direction of the tank 12 and has a bottom end located in the cargo space 13. A second through hole is formed in the side wall of the middle first pipe segment 1412 which is close to the liquid tank 12. The second through holes are covered with stainless steel wire mesh 143. The intermediate first tube section 1412 is smaller in caliber than the top tube section 1411.
The middle first pipe segment 1412 of the middle ventilation pipe system includes an inclined segment and a vertical segment, the inclined segment connects the vertical segment and the top pipe segment 1411, and the caliber of the inclined segment and the vertical segment are the same. Wherein, the second through-hole sets up on vertical section.
The top of the intermediate second tube section 1413 is located at the bottom of the intermediate first tube section 1412 and communicates with the bottom end of the intermediate first tube section 1412, thereby communicating the intermediate second tube section 1413 with the intermediate first tube section 1412. The intermediate second pipe section 1413 extends in the height direction of the tank 12 with the bottom end located in the cargo tank 13. A third through hole is formed in the side wall of the intermediate second pipe section 1413 adjacent to the tank 12. The third through hole is covered with a stainless steel wire mesh 143. The intermediate second pipe segment 1413 has a smaller caliber than the intermediate first pipe segment 1412.
The middle second pipe section 1413 includes a vertical section and a horizontal section, the vertical section connects the middle first pipe section 1412 and the horizontal section, and the vertical section and the horizontal section have the same caliber, and the horizontal section is located below the liquid tank 12. Wherein, the third through hole sets up on vertical section.
The bottom pipe section 1414 extends horizontally and is located below the tank 12. One end of the bottom tube segment 1414 is in communication with the bottom end of the intermediate second tube segment 1413, such that the bottom tube segment 1414 is in communication with the intermediate second tube segment 1413. The bottom tube section 1414 has a smaller caliber than the middle second tube section 1413. The bottom tube section 1414 is connected at one end to an intermediate second tube section 1413 and at the other end is a nipple.
Specifically, the ventilation manifold 141 is made of 316L stainless steel, which is corrosion resistant and ensures safe use.
Ventilation manifolds (not shown) are secured in the cargo compartment 13. Specifically, in this embodiment, the number of the ventilation branch pipes is three, and the three ventilation branch pipes are respectively arranged corresponding to the first through hole, the second through hole, and the third through hole of the ventilation header pipe 141.
One end of each ventilation branch pipe is respectively connected with the peripheries of the first through hole, the second through hole and the third through hole, and the other end of each ventilation branch pipe extends in the cargo space 13. In this embodiment, the other end of the ventilation branch pipe extends in the direction of the opening 111 of the cargo tank 11, i.e., in the direction from the stern to the bow.
Specifically, the ventilation branch pipes are made of rolled Q235B steel plates and are welded with the ventilation main pipe 141.
Referring to fig. 4, the fans 15 are located on the deck and are respectively disposed corresponding to the ventilation manifolds 141. The arrangement of the fan 15 on the deck not only facilitates the arrangement, but also facilitates the actual operation of crews. In this embodiment, the fan 15 is an explosion-proof axial flow fan 15, which not only ensures the safety of the liquefied gas carrier 1, but also improves the ventilation efficiency.
An openable and closable flange cover (not shown) is provided at the top end port of the ventilation header pipe 141, and the cargo tank 11 is sealed by providing the flange cover at the port. Specifically, the outside diameter of the flange cap matches the inside diameter of the port of the vent manifold 141 to effect a seal. In this embodiment, the flange cover is a blind flange that is removably connected to the vent manifold 141.
Further, a gasket is arranged between the flange cover and the port of the ventilation main pipe 141, so that the sealing performance of the liquid cargo tank 11 is improved.
The port at the top end of the ventilation manifold 141 is detachably connected with the fan 15 through a hose 16. When ventilation and air exchange are required in the cargo space 13, the flange cover is opened, and the two ends of the hose 16 are respectively connected with the port of the ventilation main pipe 141 and the interface of the fan 15, so that the ventilation main pipe 141 and the fan 15 are communicated. Specifically, the hose 16 has flexibility, and the outer diameter of the hose 16 matches the inner diameter of the port of the ventilation manifold 141, so that the hose 16 communicates with the ventilation manifold 141.
The blower 15 sends wind into the ventilation main pipe 141 through the hose 16, sends the wind into the cargo space 13 through the respective ventilation branch pipes, and sends the gas in the cargo space 13 to the opening 111, so that the gas in the cargo space 13 is discharged to the outside to force the outside air into the cargo space 13.
And the calibers of the top pipe section 1411, the middle first pipe section 1412, the middle second pipe section 1413 and the bottom pipe section 1414 are gradually reduced, so that the air output of each ventilation branch pipe is average, and the wind speed is balanced.
The ventilation main pipe 141 of each ventilation pipeline system is positioned in the cargo-air cabin 13, the airflow path is optimized, the outside air sent by the fan 15 quickly and completely enters the cargo-air cabin 13, the gas in the cargo-air cabin 13 is discharged, the ventilation branch pipes arranged at intervals in the length direction of the ventilation main pipe 141 are positioned at different heights in the cargo-air cabin 13, the gas discharge speed in the cargo-air cabin 13 is further increased, the ventilation efficiency is improved, and therefore the ventilation requirement of new specifications of a classification society can be met.
In this embodiment, each ventilation pipe system includes two ventilation manifolds 141 and six ventilation branch pipes. The two ventilation main pipes 141 are arranged at intervals along the width direction of the liquefied gas carrier 1, and the three ventilation branch pipes are arranged corresponding to one ventilation main pipe 141. The two fans 15 are respectively provided corresponding to the two air manifolds 141. Specifically, the fan 15 takes 38000m3The explosion-proof fan 15 with the air volume per hour, and can meet the requirement of 20000m3The cargo capacity of the LNG filling ship is 4400m in 13 cargo hold3The number of air changes of (2) is the new specification requirement of 8 times/hour.
And the ventilation main pipe 141 and the ventilation branch pipes are fixed in the cargo hold 13, and the fan 15 is installed on the deck, so that the storage problem of the ventilation system is solved, a crew is not required to carry all parts of the ventilation system, the risk of accidents in the carrying process of the crew is avoided, and the safety of the crew is ensured.
The method for ventilating the cargo space 13 of the liquefied gas carrier 1 comprises the following steps:
the ventilation manifold 141 is connected to the fan 15.
Specifically, both ends of the hose 16 are connected to the port of the ventilation manifold 141 and the port of the fan 15, respectively.
The hatch is opened to communicate the blower 15 with the opening 111.
The fan 15 is started to discharge the gas in the cargo-air cabin 13 to make the outside air enter the cargo-air cabin 13, so as to realize ventilation
The fan 15 sends the outside air into the ventilation main pipe 141, and then the outside air is sent into the cargo hold 13 through the ventilation branch pipe, the gas in the cargo hold 13 flows to the opening 111 along with the flowing direction of the airflow of the fan 15, and then the gas in the cargo hold 13 is discharged outwards, and the outside air enters the cargo hold 13, so that ventilation is realized. At this time, the density of the gas in the cargo space is lower than that of the air, i.e., the gas in the cargo space is lighter than the air, and thus, the gas can be discharged to the outside through the opening 111 at the top.
After the ventilation is finished, the operator enters the cargo space 13 to operate.
After the operation is finished, the hatch cover is covered, the connection between the hose 16 and the interface of the ventilation main pipe 141 is released, and the flange cover is covered on the interface, so that the air tightness in the cargo tank 13 is ensured, and the safety of the liquefied gas transport ship 1 during navigation is ensured.
In other embodiments, the blower 15 draws the air from the cargo space 13 through the ventilation manifold 141 and the ventilation branch from the interface to the outside. At this time, the density of the gas in the cargo space 13 is higher than that of the air, i.e., the gas is heavier than the air, and therefore, the gas can be drawn out to the outside through the fan 15 by the ventilation branch.
According to the liquefied gas carrier 1 and the ventilation method, when the cargo hold 13 needs ventilation, only the ventilation main pipe 141 needs to be communicated with the fan 15, and operators do not need to carry the hydraulic fan 15 or the gas drive fan 15 and accessories from a deck storage room, arrange and install the hydraulic fan 15 or the gas drive fan 15 and the accessories, so that the operation is simplified, the time is saved, and the efficiency is improved. And the ventilation main pipe 141 and the ventilation branch pipes are fixedly installed, so that the operation reliability of the ventilation system is improved.
According to the technical scheme, the invention has the advantages and positive effects that:
the liquefied gas carrier comprises a liquid cargo tank, a liquid tank, a ventilation pipeline system and a fan. The ventilation main pipe and the ventilation branch pipes of each ventilation pipeline system are located in the cargo space, one end of each ventilation branch pipe is communicated with the air main pipe, the other end of each ventilation branch pipe extends towards the opening of the cargo space, an airflow path is optimized, the ventilation main pipe is communicated with the fan, external air can enter the cargo space quickly and completely, dangerous gas in the cargo space is discharged quickly, the ventilation efficiency is improved, and therefore the requirement of new specifications of a classification society on ventilation can be met. And the liquefied gas carrier does not need crew to carry the fan to arrange and install, thereby saving time and further improving efficiency.
The fan is installed on the deck, need not the crew transport, and then has avoided the crew to take place the risk of accident in handling, has guaranteed crew's safety.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (11)

1. A liquefied gas carrier ship, comprising:
the top of the liquid cargo tank is provided with an opening, and the opening is provided with an openable hatch cover;
the liquid tank is correspondingly positioned in the liquid cargo tank; a space is arranged between the liquid tank and the liquid cargo tank to form an empty cargo tank;
the ventilation pipeline system is arranged corresponding to the cargo hold; the ventilation pipeline system comprises a ventilation main pipe and a ventilation branch pipe; the ventilation main pipe is fixed at the other end, opposite to the opening, in the cargo-air cabin, the bottom end of the ventilation main pipe extends to the lower part of the liquid tank, the top end of the ventilation main pipe penetrates through the top of the cargo tank, the ventilation branch pipe is fixed in the cargo-air cabin, one end of the ventilation branch pipe is communicated with the ventilation main pipe, and the other end of the ventilation branch pipe extends towards the opening;
the fan is arranged corresponding to the ventilation main pipe and is fixed on a deck of the liquefied gas transport ship;
the port department at ventilation house steward top is sealed through the detachable blind flange or detachably is connected to the fan, in order with be linked together between the fan with the opening, make the gas is outwards discharged in the goods empty cabin and impels the outside air to get into in the goods empty cabin.
2. A liquefied gas carrier as claimed in claim 1, wherein the port at the top end of the ventilation manifold is communicated with the blower through a hose.
3. A liquefied gas carrier as claimed in claim 2, wherein the top end of the ventilation main passes through the top of the cargo tank and extends onto the deck, the port at the top end of the ventilation main being located above the deck.
4. A liquefied gas carrier as claimed in claim 1, wherein a plurality of the vent branch pipes are provided at intervals along a length direction of the vent header pipe.
5. A liquefied gas carrier as claimed in claim 4, wherein a plurality of through holes are formed in the side wall of the ventilation main pipe, the plurality of through holes are arranged at intervals along the length direction of the ventilation main pipe, a steel wire mesh covers at each through hole, and the ventilation branch pipes are connected to the through holes in a one-to-one correspondence manner to achieve communication with the ventilation main pipe.
6. A liquefied gas carrier as claimed in claim 1, wherein the aperture of the ventilation manifold is gradually reduced from the top to the bottom along the length thereof.
7. A liquefied gas carrier as claimed in claim 6, wherein the ventilation main includes a top section, at least one intermediate section and a bottom section which are connected in series along their own length direction, the diameters of the top section are larger than the diameters of the intermediate section and the bottom section, respectively, and the diameter of the intermediate section is larger than the diameter of the bottom section.
8. A liquefied gas carrier as claimed in claim 7, wherein the bottom pipe section is located below the tank and extends horizontally.
9. A liquefied gas carrier as claimed in claim 1, wherein the ventilation piping system includes a plurality of ventilation main pipes provided at intervals in a width direction of the liquefied gas carrier and a plurality of the ventilation branch pipes corresponding to the respective ventilation main pipes.
10. A liquefied gas carrier as claimed in claim 1, wherein the fan is an explosion-proof axial flow fan.
11. A method of ventilating a cargo space of a liquefied gas carrier ship, the liquefied gas carrier ship using the liquefied gas carrier ship as set forth in any one of claims 1 to 10, the method comprising:
connecting a port at the top end of the ventilation main pipe with the fan;
opening the hatch;
and starting the fan to discharge the gas in the cargo-air cabin outwards to promote the outside air to enter the cargo-air cabin, thereby realizing ventilation.
CN202010219282.XA 2020-03-25 2020-03-25 Liquefied gas transport ship and ventilation method for cargo-air cabin of liquefied gas transport ship Active CN113443116B (en)

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