WO2014115480A1

WO2014115480A1 - Gas removal equipment, gas removal vessel, and method for removing gas from tank

Info

Publication number: WO2014115480A1
Application number: PCT/JP2013/085013
Authority: WO
Inventors: 義和藤野; 隆司雲石
Original assignee: 三菱重工業株式会社
Priority date: 2013-01-23
Filing date: 2013-12-26
Publication date: 2014-07-31
Also published as: EP2899115A1; KR20150058446A; JP2014141155A; CN104736432A; SG11201502911WA; JP6037846B2; EP2899115A4

Abstract

The purpose of the present invention is to perform a procedure for removing gas in a fuel gas tank without causing problems such as securement of an installation space and cost rise. By equipping a vessel (100) with gas removal equipment (10) provided with a gas compression unit (20), a gas heater unit (30), a gas combustion unit (40), and an inert gas supply unit (50), fuel gas in a tank (110) is removed even in the vessel (100) not provided with devices for performing a procedure for removing gas.

Description

Gas removal equipment, gas removal ship, gas removal method from tank

The present invention relates to a gas removal facility for removing fuel gas remaining in a tank, a gas removal ship, and a gas removal method from a tank.

Conventionally, ships use heavy oil or light oil as fuel, but from the viewpoint of environmental conservation, ships using fuel gas such as LNG (liquefied natural gas) as fuel are increasing in recent years (for example, see Patent Document 1). .) In such a ship, the fuel gas is stored in a tank installed on the ship or on the ship. When fuel gas is loaded as cargo, a part of the cargo may be used as fuel.

JP 2010-23776 A

When such a ship is put into a repair yard for periodic inspections or repairs, the fuel gas in the tank is removed to inactivate the tank in order to ensure safety against work such as welding. It is necessary to replace the gas with an inert gas, and it is desirable to replace the inert gas with air (such a treatment is appropriately referred to as a gas removal treatment).

In order to apply such a gas removal treatment to the fuel gas tank, in addition to equipment for propelling the vessel using the fuel gas as fuel for the target vessel, it is necessary for the gas removal treatment of the fuel gas in the tank. It is necessary to equip equipment. Therefore, a space for installing equipment for gas removal treatment that is not always necessary for a ship using fuel gas as a fuel must be secured in the ship, and of course, this also costs money.

The present invention has been made in view of such circumstances, and a gas removal facility and a gas capable of performing a gas removal treatment of fuel gas from a tank without causing problems such as securing an installation space and an increase in cost. It aims at providing the gas removal method from a removal ship and a tank.

The gas removal facility according to the first aspect of the present invention is a portable gas removal facility that can be mounted on a ship using fuel gas as fuel, and compresses the gas extracted from the tank of the ship. A gas compression section; a gas heater section for heating the gas extracted from the tank of the ship; and the fuel gas discharged from the tank is combusted by being vaporized or volume-expanded by heating in the gas heater section. At least one of a gas combustion part and an inert gas supply part for sending an inert gas into the tank is housed in a casing.
In such a gas removal facility, the gas extracted from the tank is compressed and returned to the tank, and the gas is heated to vaporize the fuel gas remaining in the tank and raise the temperature of the tank. A part of the vaporized or volume-expanded gas is sent to the gas combustion section, burned and discharged. And if an inert gas is sent in in a tank, the inside of a tank can be substituted by an inert gas.
Here, the gas compression unit, the gas heater unit, the gas combustion unit, and the inert gas supply unit need only have at least one of them, and a configuration in which some of them are excluded depending on the equipment on the ship side. Can do. The tank is, for example, a fuel tank.

When at least one of the gas compression unit, the gas heater unit, the inert gas supply unit, and the gas combustion unit is accommodated in a casing, a crane equipped in a ship or a port is used, and fuel gas is supplied. It can be easily mounted on a ship used as fuel.
Here, the gas compression unit, the gas heater unit, the inert gas supply unit, and the gas combustion unit can be accommodated together in one casing, but the gas compression unit, the gas heater unit, the inert gas supply unit, the gas combustion unit May be accommodated in individual casings.
When the ship side is equipped with a device capable of performing a part of the function of the gas removal facility, it suffices to house something other than the device in a casing and mount it on the ship. In this case, if the gas compression unit, the gas heater unit, the inert gas supply unit, and the gas combustion unit are individually housed in the casing, only the casing that houses the necessary equipment may be selected and mounted on the ship.

It is also possible to further include a water spray device for spraying water on the casing. Thereby, a casing can be cooled and fire prevention performance can be improved. Here, the water is preferably used by pumping up seawater around the ship by a pump or the like.

Also, a gas detection device may be provided in the casing, and the operation may be stopped when gas is detected by the gas detection device. This increases safety.

A gas removal ship according to a second aspect of the present invention is equipped with a portable gas removal facility for removing fuel gas from the tank of a ship that uses fuel gas as fuel, and the gas removal equipment. A gas carrier unit that compresses the gas extracted from the tank; a gas heater unit that heats the gas extracted from the tank of the ship; and At least one of a gas combustion section that burns the fuel gas discharged from the tank by being vaporized or volume-expanded by heating in the gas heater section, and an inert gas supply section that feeds the inert gas into the tank. The gas compression unit, the gas heater unit, the inert gas supply unit, and the gas combustion unit are housed in a casing. A barge is suitable as such a carrier.

Further, a gas removal method from a tank according to a third aspect of the present invention is a gas removal method from a tank that is mounted on a ship and stores fuel gas, using the gas removal equipment as described above, Connecting a gas removal facility to the tank of the ship, heating the gas in the tank by the gas heater, compressing the gas in the gas compressor, and circulating the gas in the tank; and A step of burning the gas pushed out of the tank by volume expansion by being heated in the section and discharging the gas to the outside by the gas combustion section; and feeding an inert gas into the tank.

According to the present invention, since it is not necessary to equip the ship with a gas removal facility, it is possible to perform a gas removal treatment of the fuel gas from the tank without causing problems such as securing the installation space and increasing the cost.

It is a perspective view which shows each unit which comprises the gas removal installation which concerns on one Embodiment of this invention. It is a figure which shows the state which installed the gas removal equipment which concerns on one Embodiment of this invention on the ship. It is a figure which shows the modification which mounted the gas removal installation which concerns on one Embodiment of this invention on a trolley.

Hereinafter, a gas removal method, a gas removal ship, and a gas removal method from a tank according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the gas removal equipment 10 includes a gas compression unit (gas compression unit) 20, a gas heater unit (gas heater unit) 30, a gas combustion unit (gas combustion unit) 40, and an inert gas. A supply unit (inert gas supply unit) 50.

The gas compression unit 20 includes a container-shaped casing 21, and includes a compressor 22, a drive motor 23 that drives the compressor 22, and a control panel 24 that controls the operation of the drive motor 23. In the casing 21, a suction pipe 25 A connected to the suction side of the compressor 22, a discharge pipe 26 connected to the discharge side of the compressor 22, and an inert gas suction pipe 25 B that sucks an inert gas by the compressor 22. Are respectively provided through the inside and outside of the casing 21.
The drive motor 23 is preferably explosion-proof because safety is improved.

The gas heater unit 30 includes a casing 31 having a container shape and a gas heater 32 and a control panel 34 for controlling the operation of the gas heater 32. In the casing 31, a suction pipe 35 connected to the suction side of the gas heater 32 and a first discharge pipe 36 A and a second discharge pipe 36 B connected to the discharge side of the gas heater 32 respectively penetrate the inside and outside of the casing 31. Is provided.

The gas combustion unit 40 includes a gas combustion furnace 42, a blower 43 that feeds combustion air into the gas combustion furnace 42, and a control panel that controls the operation of the gas combustion furnace 42 and the blower 43. 44. The casing 41 is provided with a feed pipe 45 that feeds gas into the gas combustion furnace 42 and a gas discharge pipe 46 that discharges the exhaust gas of the gas combustion furnace 42 so as to penetrate the inside and outside of the casing 41.

The inert gas supply unit 50 includes an inert gas generator 52 that generates an inert gas such as nitrogen gas or carbon dioxide in a container-like casing 51, and an inert gas generated by the inert gas generator 52. An inert gas tank 53 in which gas is stored, and a control panel 54 that controls the operation of the inert gas generator 52 and the inert gas tank 53 are provided. The casing 51 is provided with an inert gas delivery pipe 55 for delivering an inert gas from the inert gas tank 53 so as to penetrate inside and outside. Here, the inert gas generator 52 generates nitrogen gas, which is an inert gas, by separating carbon dioxide (CO ₂ ) with an absorber and performing oxygen separation by cryogenic separation, for example, a membrane ( Membrane) separation type, PSA method (pressure swing adsorption method) type, etc. can be used as appropriate.

The

casings

21, 31, 41, 51 of the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 are all lifted by a lifting equipment such as a crane provided in a ship or a harbor. It is formed to have a movable structure, size, and strength, and is an appropriate size that does not provide an unnecessarily large margin for the equipment to be stored, and is more preferably a minimum size.
In the container shape, the

casings

21, 31, 41, 51 have a rectangular parallelepiped structure on the outer periphery. Further, if the periphery of the

casing

21, 31, 41, 51 is surrounded by a wall surface, the inside of the

casing

21, 31, 41, 51 and the outside environment can be separated, so that the inside of the

casing

21, 31, 41, 51 is inside. Is more preferable because it has an explosion-proof structure in an inert gas atmosphere and has an effect of shielding from external heat input.

Further,

gas detectors

27, 37, and 47 are provided in the

casings

21, 31, and 41 of the gas compression unit 20, the gas heater unit 30, and the gas combustion unit 40, and gas is detected by the

gas detectors

27, 37, and 47. When a leak is detected, an abnormal signal is output to the

control panels

24, 34, and 44. The

control panels

24, 34 and 44 are configured to stop the operation of each unit when receiving an abnormal signal.

Further, on the outer upper surfaces of the

casings

21, 31, 41, 51 of the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50, water is applied to the outer surfaces of the

casings

21, 31, 41, 51.

Water spraying devices

28, 38, 48, and 58 for spraying are provided. The

water spray devices

28, 38, 48, 58 spray seawater pumped up by a pump (not shown) from the plurality of

nozzles

29, 39, 49, 59 onto the upper surfaces of the

casings

21, 31, 41, 51. ing. Thereby, the temperature rise of each unit can be suppressed and fire prevention measures can be taken.

In order to remove gas from the fuel gas tank 110 of the ship 100 before the ship 100 enters the repair yard using the gas removal equipment 10 as described above, the operation is performed in the following flow.
First, the liquid phase of the fuel gas in the tank 110 is extracted by the pump 111 provided in the tank 110 of the ship 100. Even after the liquid has been extracted, the liquid remains in the tank 110 below the suction port of the pump 111 and is removed by the gas removal equipment 10.
For this, the gas compression unit 20, gas heater unit 30, gas combustion unit 40, and inert gas supply unit 50 housed in each casing are lifted by a crane or the like and installed on the deck 112 of the ship 100. Then, the suction pipe 25 A of the gas compression unit 20 and the first discharge pipe 36 A of the gas heater unit 30 are connected to the tank 110 of the ship 100 via

pipes

91 and 92. Further, the discharge pipe 26 of the gas compression unit 20 and the suction pipe 35 of the gas heater unit 30 are connected via a pipe 93. Further, the second discharge pipe 36 B of the gas heater unit 30 and the supply pipe 45 of the gas combustion unit 40 are connected via a pipe 94. In addition, the inert gas delivery pipe 55 of the inert gas supply unit 50 and the inert gas suction pipe 25 B of the gas compression unit 20 are connected via a pipe 95. A chimney 70 is connected to the gas discharge pipe 46 of the gas combustion unit 40. Here, since the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 are accommodated in the

casings

21, 31, 41, 51 having a container shape, pipes and pipes can be connected. You may arrange | position closely in the range which does not have trouble. Moreover, the gas heater unit 30 is installed on the upper part of the gas compression unit 20, and the three-dimensional arrangement in the vertical direction is possible in addition to the planar arrangement. For this reason, it can be appropriately arranged in a limited space on the deck 112 or the like.

After installing each unit of the gas removal equipment 10 in this way, the

control panels

24, 34, 44, and 54 of the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 are used for each unit. By controlling the operation, the gas removal procedure is performed as follows.
First, the compressor 22 of the gas compression unit 20, the gas heater 32 of the gas heater unit 30, and the gas combustion furnace 42 are operated. As a result, the gas in the gas phase portion of the fuel gas in the tank 110 is sucked from the pipe 91 and the suction pipe 25A on the suction side of the compressor 22 and compressed by the compressor 22, and then the discharge pipe 26 and the pipe 93 are compressed. Then, the gas is fed into the gas heater 32 through the suction pipe 35. In the gas heater 32, the gas compressed by the compressor 22 is heated and gasified. The heated and gasified gas is returned into the tank 110 via the first discharge pipe 36A and the pipe 92. If the above operation is continued, the gas in the tank 110 circulates through the compressor 22 of the gas compression unit 20 and the gas heater 32 of the gas heater unit 30 and is gradually heated. Thereby, the liquid phase component of the fuel gas remaining in the tank 110 is gradually gasified.

Since the volume of the fuel gas is increased by gasification, the volume of fuel gas is increased from the gas heater 32 of the gas heater unit 30 through the second discharge pipe 36B, the pipe 94, and the feed pipe 45. Is sent to.

In the gas combustion unit 40, the fuel gas fed from the gas heater unit 30 is mixed with the air taken in from the outside by the blower 43 in the gas combustion furnace 42, and burned. Exhaust gas generated by burning fuel gas in the gas combustion furnace 42 is discharged to the outside through the gas discharge pipe 46 and the chimney 70.

By continuously performing the above processing, the fuel gas in the tank 110 is gasified and removed from the tank 110. Further, the temperature of the tank 110 also increases.
Thereafter, the inert gas generated by the inert gas generator 52 of the inert gas supply unit 50 is drawn from the inert gas tank 53 into the inert gas delivery pipe 55, the pipe 95, and the gas compression unit 20. It feeds into the compressor 22 through the pipe 25B. The compressor 22 compresses the supplied inert gas (when the inert gas generated by the inert gas generator 52 has a necessary pressure, the compressor 22 compresses the inert gas. The inert gas heating in the gas heater unit 30 is not performed when the inert gas generated by the inert gas generator 52 has a necessary temperature. It may be sent into the tank 110. When the inert gas is sent in this way, the gas phase component of the fuel gas remaining in the tank 110 is pushed out. By continuing to feed such an inert gas into the tank 110, the inside of the tank 110 is replaced with the inert gas from the fuel gas. Here, the fuel gas pushed out of the tank 110 by the inert gas is burned by the gas combustion unit 40 as described above.

Thereafter, the inert gas in the tank 110 can be replaced with air.

As described above, by installing the gas removal equipment 10 on the ship 100, the fuel in the tank 110 can be obtained by installing the gas removal equipment 10 even on the ship 100 that does not include the equipment for performing the gas removal treatment. Gas can be removed. As a result, the gas removal treatment of the fuel gas tank 110 can be performed on the ship 100 side without causing problems such as securing the installation space and increasing costs.

The gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 are accommodated in the

casings

21, 31, 41, 51, respectively. , 41, 51 can have an explosion-proof structure.
In addition, the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 include

casings

21, 31, 41, 51, respectively, so that they can be easily handled with a crane or the like. it can.

By the way, in the said embodiment, although the gas removal equipment 10 was set as the structure provided with the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50, it is not necessarily all. It is not necessary to mount on the ship 100. For example, when a compressor is previously used on the ship 100 side, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 are used as the gas removal equipment 10 except for the gas compression unit 20. Are mounted on the ship 100. When the ship 100 includes an inert gas generator, the gas removal facility 10 is mounted on the ship 100 except for the inert gas supply unit 50. In addition to this, depending on the equipment equipped on the ship 100 side, some units of the gas removal equipment 10 may be mounted on the ship 100.
In the gas removal equipment 10 of the above embodiment, the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 are unitized for each function. Therefore, the minimum necessary unit can be selected and installed.

Moreover, in the said embodiment, although the gas removal equipment 10 was set as the structure provided with the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50, these are integrated unit. It is also possible. In this case, as described above, when the ship 100 side includes a part of the functions of the gas removal facility 10, some functions may not be operated in the gas removal facility 10.

In short, the present invention exemplified in the above-described embodiment is such that the portable gas removal equipment 10 stored in the casing is mounted on the upper deck 112 of the ship 100, and the liquefied fuel gas piping on the gas removal equipment 10 and the ship 100 side. This is a gas removal method for a liquefied gas dredger that connects the system and removes the liquefied gas in the liquefied fuel gas piping system.

(Modification)
In the above embodiment, the gas compression unit 20, the gas heater unit 30, the gas combustion unit 40, and the inert gas supply unit 50 constituting the gas removal facility 10 are mounted on the deck 112 of the ship 100 by a crane. However, as shown in FIG. 3, these gas compression unit 20, gas heater unit 30, gas combustion unit 40, and inert gas supply are provided on deck 201 of barge ship (truck) 200. A gas removal ship may be configured by mounting the unit 50. In this case, the units constituting the gas removal equipment 10 are connected in advance in the same manner as shown in FIG.
When performing the gas removal treatment of the fuel gas, the barge ship 200 is brought close to the ship 100, and the gas compression unit 20 and the gas heater unit 30 of the gas removal equipment 10 on the barge ship 200 are replaced with the tank 110 of the ship 100. And the

pipes

91 and 92 are connected to perform the gas removal treatment shown in the above embodiment.

10 Gas removal equipment 20 Gas compression unit (gas compression unit)
21, 31, 41, 51 Casing 22 Compressor 23

Drive motors

24, 34, 44, 54 Control panel 25A Suction pipe 25B Inert gas suction pipe 26

Discharge pipes

27, 37, 47

Gas detection devices

28, 38, 48, 58

Water spraying device

29, 39, 49, 59 Nozzle 30 Gas heater unit (gas heater unit)
32 Gas heater 35 Suction pipe 36A First discharge pipe 36B Second discharge pipe 40 Gas combustion unit (gas combustion section)
42 Gas Combustion Furnace 43 Blower 45 Feed Pipe 46 Gas Discharge Pipe 50 Inert Gas Supply Unit (Inert Gas Supply Unit)
52 Inert Gas Generator 53 Inert Gas Tank 55 Inert Gas Delivery Pipe 70 Chimney 100 Ship 110 Tank 111 Pump 200 Barge Ship (Boat)

Claims

A portable gas removal facility that can be mounted on a ship using fuel gas as fuel,
A gas compression section for compressing the gas extracted from the tank of the ship;
A gas heater for heating the gas extracted from the tank of the ship;
A gas combustion section for burning the fuel gas discharged from the tank by being vaporized or volume-expanded by heating in the gas heater section;
An inert gas supply unit for feeding an inert gas into the tank;
At least one of the above is housed in a casing.
The gas removal equipment according to claim 1, wherein the gas compression section, the gas heater section, the inert gas supply section, and the gas combustion section are respectively housed in the casings.
The gas removal equipment according to claim 1 or 2, further comprising a water spray device for spraying water onto the casing.
A gas detection device is provided in the casing,
The gas removal equipment according to any one of claims 1 to 3, wherein when the gas is detected by the gas detection device, the operation is stopped.
A portable gas removal facility that removes the fuel gas from the tank of the ship using the fuel gas as fuel;
A gas carrier equipped with the gas removal equipment, and a trolley that is close to the ship; and
The gas removal equipment is
A gas compression section for compressing the gas extracted from the tank;
A gas heater for heating the gas extracted from the tank of the ship;
A gas combustion section for burning the fuel gas discharged from the tank by being vaporized or volume-expanded by heating in the gas heater section;
An inert gas supply unit for feeding an inert gas into the tank;
A gas removal vessel comprising: at least one of the gas compression unit, the gas heater unit, the inert gas supply unit, and the gas combustion unit housed in a casing.
A gas removal method using a gas removal facility according to any one of claims 1 to 4 mounted on a ship and storing a fuel gas.
Connecting the gas removal facility to a tank of the ship;
Heating the gas in the tank with the gas heater unit, compressing the gas in the gas compression unit, and circulating the gas in the tank;
The gas is heated by the gas heater unit and volume-expanded, whereby the gas pushed out of the tank is burned by the gas combustion unit and discharged to the outside.
A method for removing gas from a tank, wherein an inert gas is fed into the tank.