Technical Field
[0001] The present disclosure relates to a ship.
Background Art
[0003] A liquefied gas carrier or the like is provided with a liquefied gas storage tank.
Such a tank may be filled with an inert gas and then the inert gas in the tank may
be replaced with air or the like such that the liquefied gas remaining in the tank
does not come into contact with oxygen when the tank is opened for maintenance or
the like (see, for example, PTL 1).
Citation List
Patent Literature
Summary of Invention
Technical Problem
[0005] By the way, the type of gas stored in the tank may be switched in the liquefied gas
storage tank. At this time, a problem may arise due to contact between the residual
gas of a first gas stored in the tank before the switching and a second gas stored
in the tank after the switching. Examples of the problem include solid generation
resulting from a chemical reaction between the first gas and the second gas. In addition,
the first gas may be mixed with the second gas and the first gas may remain in the
tank after the switching. Accordingly, in a case where the type of gas stored in the
tank is switched, as in the case of the inert gas of PTL 1, the second gas needs to
be loaded into the tank after the first gas in the tank is replaced with the inert
gas.
[0006] However, as for the method described above, it is necessary to sequentially execute
the steps of discharging the first gas to the outside of the tank, performing replacement
with the inert gas or the like in the tank, and loading the second gas into the tank
in switching the type of gas loaded into the tank. As a result, it takes time and
effort to switch the type of gas loaded into the tank. In addition, depending on the
type of the residual gas in the tank, the residual gas cannot be directly released
from the tank into the atmosphere, and it may take time and effort to treat the residual
gas.
[0007] The present disclosure has been made in view of the above, and an object of the present
disclosure is to provide a ship in which the type of gas loaded into a tank can be
switched with ease and speed.
Solution to Problem
[0008] In order to achieve the above object, a method according to claim 1 has been provided.
Advantageous Effects of Invention
[0009] According to the method of the present disclosure, it is possible to efficiently
switch the type of gas loaded into the tank and work can be facilitated and expedited.
Brief Description of Drawings
[0010]
Fig. 1 is a plan view illustrating a schematic configuration of a ship according to
an embodiment of the present disclosure.
Fig. 2 is a side cross-sectional view illustrating a state where liquefied carbon
dioxide is loaded in a tank to which the ship according to the embodiment of the present
disclosure is applied.
Fig. 3 is a side cross-sectional view illustrating a state where liquefied ammonia
is loaded in the tank to which the ship according to the embodiment of the present
disclosure is applied.
Fig. 4 is a side cross-sectional view illustrating a state where ammonia gas remains
in the tank with the liquefied ammonia discharged in the ship according to the embodiment
of the present disclosure.
Fig. 5 is a side cross-sectional view illustrating a state where the liquefied carbon
dioxide is supplied to the tank and a mixed gas is sent into a water tank in the ship
according to the embodiment of the present disclosure.
Fig. 6 is a side cross-sectional view illustrating a state where carbon dioxide gas
remains in the tank with the liquefied carbon dioxide discharged in the ship according
to the embodiment of the present disclosure.
Fig. 7 is a side cross-sectional view illustrating a state where the liquefied ammonia
is supplied to the tank and the mixed gas is sent into the water tank in the ship
according to the embodiment of the present disclosure.
Description of Embodiments
[0011] Hereinafter, a ship according to an embodiment of the present disclosure will be
described with reference to Figs. 1 to 7.
(Configuration of Hull of Ship)
[0012] A ship 1 of the embodiment of the present disclosure illustrated in Figs. 1 and 2
is capable of selectively carrying, for example, liquefied carbon dioxide and liquefied
ammonia. The ship 1 includes at least a hull 2, a tank 21, an upper supply line 32,
a lower supply line 33 as a supply line, a discharge line 35, and a water tank 50.
(Hull Configuration)
[0013] As illustrated in Fig. 1, the hull 2 has a pair of broadsides 3A and 3B, a ship bottom
(not illustrated), and a deck 5, which form the outer shell of the hull 2. The broadsides
3A and 3B are provided with a pair of broadside skins respectively forming the left
and right broadsides. The ship bottom (not illustrated) is provided with a ship bottom
skin connecting the broadsides 3A and 3B. By the pair of broadsides 3A and 3B and
the ship bottom (not illustrated), the outer shell of the hull 2 has a U shape in
a cross section orthogonal to a ship stern direction Da. The deck 5 exemplified in
this embodiment is a whole deck exposed to the outside. In the hull 2, an upper structure
7 having a living quarter is formed on the deck 5 on a stern 2b side.
[0014] In the hull 2, a cargo loading section (hold) 8 is formed closer to a bow 2a side
than the upper structure 7. The cargo loading section 8 is recessed toward the ship
bottom (not illustrated) below the deck 5 and is open upward.
(Tank Configuration)
[0015] A plurality of the tanks 21 are disposed in the cargo loading section 8. In this
embodiment, for example, a total of seven tanks 21 are disposed in the cargo loading
section 8. The tank 21 is not limited in any manner in terms of layout and installation
number in the cargo loading section 8. In this embodiment, each tank 21 has, for example,
a cylindrical shape extending in the horizontal direction (specifically, ship stern
direction) . The tank 21 is not limited to a cylindrical tank and may be spherical.
(Supply Line Configuration)
[0016] As illustrated in Fig. 2, the upper supply line 32 and the lower supply line 33 are
provided in each tank 21.
[0017] The upper supply line 32 reaches the inside of the tank 21 from the outside of the
tank 21. An opening portion 32a opening to the upper portion in the tank 21 is formed
at the tip of the upper supply line 32. Here, the upper portion in the tank means
the region in the tank 21 that is on the side closer to the upper end of the tank
21 than the center of the tank 21 in the ship height direction (that is, the up-down
direction of the tank 21). As an example, the portion can be the top of the tank 21.
The upper supply line 32 is provided with an opening-closing valve 32v. In addition,
the discharge line 35 is branch-connected to the upper supply line 32.
[0018] The lower supply line 33 reaches the inside of the tank 21 from the outside of the
tank 21. An opening portion 33a opening to the lower portion in the tank 21 is formed
at the tip of the lower supply line 33. Here, the lower portion in the tank 21 means
the region in the tank 21 that is on the side closer to the lower end of the tank
21 than the center of the tank 21 in the ship height direction. As an example, the
portion can be the bottom portion of the tank 21. The lower supply line 33 is provided
with an opening-closing valve 33v.
(Discharge Line Configuration)
[0019] When the type of gas loaded into the tank 21 is switched, the discharge line 35 discharges
the gas stored in the tank 21 and containing at least one of ammonia and carbon dioxide
to the outside of the tank 21. One end side of the discharge line 35 branches from
the upper supply line 32. The discharge line 35 is provided with an opening-closing
valve 35v.
(Water Tank Configuration)
[0020] The water tank 50 is provided in the hull 2 (see Fig. 1). The water tank 50 may be,
for example, a ballast tank provided in the hull 2. Water W can be stored in the water
tank 50. The water W stored in the water tank 50 may be seawater. The other end of
the discharge line 35 is disposed in the water tank 50. As a result, the gas discharged
from the tank 21 through the discharge line 35 is introduced into the water W in the
water tank 50.
[0021] The water tank 50 exemplified in this embodiment is provided with a heating unit
52. The heating unit 52 is configured to be capable of heating the water W in the
water tank 50. For example, the component (carbon dioxide or ammonia) contained in
the gas discharged from the tank may cause a chemical reaction via the water W and
a substance resulting from the chemical reaction (for example, ammonium carbonate)
may be dissolved in the water W in the water tank 50. In this case, it is possible
to perform separation into the components before the chemical reaction (carbon dioxide,
ammonia, and water) by the heating unit 52 heating the water W in the water tank 50.
[0022] Further, a separated gas discharge line 53 is connected to the water tank 50 exemplified
in this embodiment. By the separated gas discharge line 53, the gas containing the
above components separated by the heating unit 52 can be discharged to the outside
of the ship.
(Liquefied Gas Loading into and Discharge from Tank)
[0023] Either liquefied carbon dioxide Lc or liquefied ammonia La is selectively loaded
into the tank 21.
[0024] In a case where the ship 1 repeatedly carries only one of the liquefied carbon dioxide
Lc and the liquefied ammonia La, liquefied carbon dioxide loading into the tank 21
or liquefied ammonia loading into the tank 21 is performed as follows.
(Liquefied Carbon Dioxide Loading into Tank)
[0025] As illustrated in Fig. 2, in order to load the liquefied carbon dioxide Lc into the
tank 21, a pipe (not illustrated) for supplying the liquefied carbon dioxide Lc from
an outboard liquefied carbon dioxide supply facility or the like is connected to the
lower supply line 33. The opening-closing valve 33v is opened, and the liquefied carbon
dioxide Lc is sent from the outside of the ship into the lower supply line 33. Then,
the liquefied carbon dioxide Lc is loaded into the tank 21 from the opening portion
33a. In this manner, the liquefied carbon dioxide Lc is stored in the tank 21. In
addition, carbon dioxide gas Gc resulting from partial vaporization of the liquefied
carbon dioxide Lc is in the upper portion in the tank 21. The liquefied carbon dioxide
Lc may be loaded into the tank 21 through the upper supply line 32 with the opening-closing
valve 32v open.
(Liquefied Ammonia Loading into Tank)
[0026] As illustrated in Fig. 3, in order to load the liquefied ammonia La into the tank
21, a pipe (not illustrated) for supplying the liquefied ammonia La from an outboard
liquefied ammonia supply facility or the like is connected to the lower supply line
33. The opening-closing valve 33v is opened, and the liquefied ammonia La is sent
from the outside of the ship into the lower supply line 33. Then, the liquefied ammonia
La is loaded into the tank 21 from the opening portion 33a. In this manner, the liquefied
ammonia La is stored in the tank 21. In addition, ammonia gas Ga resulting from partial
vaporization of the liquefied ammonia La is in the upper portion in the tank 21. The
liquefied ammonia La may be loaded into the tank 21 through the upper supply line
32 with the opening-closing valve 32v open.
(Gas Replacement from Liquefied Ammonia to Liquefied Carbon Dioxide)
[0027] In the case of liquefied ammonia-to-liquefied carbon dioxide replacement of the liquefied
gas loaded into the tank 21, first, the liquefied ammonia La in the tank 21 is discharged
to an outboard liquefied ammonia recovery facility or the like. In order to discharge
the liquefied ammonia La stored in the tank 21, the opening-closing valve 33v is opened
and the liquefied ammonia La is suctioned out of the tank 21 through the lower supply
line 33 by, for example, a cargo pump (not illustrated). As a result, the liquefied
ammonia La in the tank 21 is discharged to the outboard liquefied ammonia recovery
facility or the like through the lower supply line 33.
[0028] After the liquefied ammonia La in the tank 21 is discharged, the ammonia gas Ga remains
in the tank 21 as illustrated in Fig. 4.
[0029] Subsequently, as illustrated in Fig. 5, the liquefied carbon dioxide Lc is supplied
to the lower portion of the tank 21. In order to supply the liquefied carbon dioxide
Lc to the tank 21, the opening-closing valve 33v is opened and the liquefied carbon
dioxide Lc is sent into the lower supply line 33 from the outside of the ship. The
liquefied carbon dioxide Lc is loaded into the tank 21 from the opening portion 33a.
The liquefied carbon dioxide Lc is higher in specific gravity than the ammonia gas
Ga in the tank 21. Accordingly, the liquefied carbon dioxide Lc sent into the tank
21 is stored in the lower portion of the tank 21. The ammonia gas Ga is stored above
the liquefied ammonia La in the tank 21. In addition, the carbon dioxide gas Gc generated
by the liquefied carbon dioxide Lc vaporizing also accumulates in the upper portion
of the tank 21. In other words, when the liquefied carbon dioxide Lc is supplied into
the tank 21, mixed gas Gm of the ammonia gas Ga and the carbon dioxide gas Gc is stored
in the upper portion of the tank 21.
[0030] When the liquefied carbon dioxide Lc is sent into the tank 21 as described above,
the opening-closing valve 35v provided on the discharge line 35 is opened. When the
liquefied carbon dioxide Lc continues to be supplied to the lower portion of the tank
21, the mixed gas Gm of the ammonia gas Ga and the carbon dioxide gas Gc in the upper
portion of the tank 21 is pushed upward in the tank 21 as the amount of the liquefied
carbon dioxide Lc in the tank 21 increases. After the push, the mixed gas Gm flows
into the upper supply line 32 from the opening portion 32a open in the upper portion
in the tank 21. After flowing into the upper supply line 32, the mixed gas Gm is introduced
into the water W in the water tank 50 through the discharge line 35.
[0031] Then, ammonia (NH
3) and carbon dioxide (CO
2), which are components contained in the mixed gas Gm, are released into the water
W and cause a chemical reaction via the water W (H
2O). Then, solid ammonium carbonate ((NH
4)
2CO
3) or ammonium bicarbonate (NH
4HCO
3) is generated as a result of the chemical reaction. The generated ammonium carbonate
or ammonium bicarbonate is stored in the water tank 50 in a state of being dissolved
in the water W.
[0032] If not the mixed gas Gm but only the ammonia gas Ga is discharged from the upper
portion of the tank 21 to the upper supply line 32 in the initial stage in which the
liquefied carbon dioxide Lc is sent into the tank 21, the ammonia gas Ga may be recovered,
without being sent into the water tank 50, through the upper supply line 32 by an
ammonia gas recovery facility or the like provided outside the ship.
[0033] The opening-closing valves 33v and 35v are closed when a predetermined amount of
the liquefied carbon dioxide Lc is stored in the tank 21. As a result, the work of
replacing the liquefied gas loaded into the tank 21 from the liquefied ammonia La
to the liquefied carbon dioxide Lc is completed.
(Gas Replacement from Liquefied Carbon Dioxide to Liquefied Ammonia)
[0034] In the case of liquefied carbon dioxide-to-liquefied ammonia replacement of the liquefied
gas loaded into the tank 21, first, the liquefied carbon dioxide Lc in the tank 21
is discharged to an outboard liquefied carbon dioxide recovery facility or the like.
In order to discharge the liquefied carbon dioxide Lc stored in the tank 21, the opening-closing
valve 33v is opened and the liquefied carbon dioxide Lc is suctioned out of the tank
21 through the lower supply line 33 by, for example, a cargo pump (not illustrated).
As a result, the liquefied carbon dioxide Lc in the tank 21 is discharged to the outboard
liquefied carbon dioxide recovery facility or the like through the lower supply line
33.
[0035] After the liquefied carbon dioxide Lc in the tank 21 is discharged, the carbon dioxide
gas Gc remains in the tank 21 as illustrated in Fig. 6.
[0036] Subsequently, as illustrated in Fig. 7, the liquefied ammonia La is supplied to the
lower portion of the tank 21. In order to supply the liquefied ammonia La to the tank
21, the opening-closing valve 33v is opened and the liquefied ammonia La is sent into
the lower supply line 33 from the outside of the ship. Then, the liquefied ammonia
La is loaded into the tank 21 from the opening portion 33a.
[0037] The liquefied ammonia La is higher in specific gravity than the carbon dioxide gas
Gc in the tank 21. Accordingly, the liquefied ammonia La sent into the tank 21 is
stored in the lower portion of the tank 21. The carbon dioxide gas Gc is stored above
the liquefied carbon dioxide Lc in the tank 21. In addition, the ammonia gas Ga generated
by the liquefied ammonia La vaporizing also accumulates in the upper portion of the
tank 21. In other words, when the liquefied ammonia La is supplied into the tank 21,
the mixed gas Gm of the carbon dioxide gas Gc and the ammonia gas Ga is stored in
the upper portion of the tank 21.
[0038] When the liquefied ammonia La is sent into the tank 21 as described above, the opening-closing
valve 35v provided on the discharge line 35 is opened. When the liquefied ammonia
La continues to be supplied to the lower portion of the tank 21, the mixed gas Gm
of the carbon dioxide gas Gc and the ammonia gas Ga in the upper portion of the tank
21 is pushed upward in the tank 21 as the amount of the liquefied ammonia La in the
tank 21 increases. After the push, the mixed gas Gm flows into the upper supply line
32 from the opening portion 32a open in the upper portion in the tank 21. After flowing
into the upper supply line 32, the mixed gas Gm is introduced into the water W in
the water tank 50 through the discharge line 35.
[0039] Then, ammonia (NH
3) and carbon dioxide (CO
2), which are components contained in the mixed gas Gm, are released into the water
W and cause a chemical reaction via the water W (H
2O). Then, solid ammonium carbonate ((NH
4)
2CO
3) or ammonium bicarbonate (NH
4HCO
3) is generated as a result of the chemical reaction. The generated ammonium carbonate
or ammonium bicarbonate is stored in the water tank 50 in a state of being dissolved
in the water W.
[0040] If not the mixed gas Gm but only the carbon dioxide gas Gc is discharged from the
upper portion of the tank 21 to the upper supply line 32 in the initial stage in which
the liquefied ammonia La is sent into the tank 21, the carbon dioxide gas Gc may be
recovered as it is by, for example, a carbon dioxide recovery facility provided outside
the ship or may be released to the outside of the ship without being sent into the
water tank 50.
[0041] The opening-closing valves 33v and 35v are closed when a predetermined amount of
the liquefied carbon dioxide Lc is stored in the tank 21. As a result, the liquefied
gas loaded into the tank 21 can be replaced from the liquefied carbon dioxide Lc to
the liquefied ammonia La.
(Pyrolysis Treatment of Water in Water Tank)
[0042] As described above, the water W in the water tank 50 can be pyrolyzed by operating
the heating unit 52. The ammonium carbonate- or ammonium bicarbonate-dissolved water
W is heated when the heating unit 52 is operated. When the water W in the water tank
50 is heated to, for example, 58°C or higher, the ammonium carbonate or ammonium bicarbonate
is pyrolyzed into ammonia, carbon dioxide, and the water W. These pyrolyzed ammonia
and carbon dioxide are discharged to, for example, a treatment facility provided outside
the ship through the separated gas discharge line 53 or the like.
(Action and Effect)
[0043] The ship 1 of the above embodiment includes the tank 21 where one of the ammonia
gas Ga and the carbon dioxide gas Gc remains (is stored), the lower supply line 33
supplying the other of the liquefied ammonia La and the liquefied carbon dioxide Lc
into the tank 21, the discharge line 35 discharging the mixed gas of the ammonia gas
Ga or the carbon dioxide gas Gc that remains in the tank 21 and the gas vaporized
from the other of the liquefied ammonia La and the liquefied carbon dioxide Lc when
the other of the liquefied ammonia La and the liquefied carbon dioxide Lc is supplied
from the lower supply line 33, and the water tank 50 into which the mixed gas discharged
from the discharge line 35 is introduced.
[0044] In such a configuration, when the other of the liquefied ammonia La and the liquefied
carbon dioxide Lc is supplied through the lower supply line 33 into the tank 21 where
one of the ammonia gas Ga and the carbon dioxide gas Gc remains, the mixed gas in
which ammonia and carbon dioxide are mixed is discharged from the tank 21. This mixed
gas is introduced into the water tank 50 through the discharge line 35 and released
into the water W. Then, a chemical reaction occurs as a result of ammonia-carbon dioxide-water
contact in the tank 21, and ammonium carbonate or ammonium bicarbonate is generated.
The ammonium carbonate or ammonium bicarbonate is dissolved in the water W and stored.
Accordingly, there is no need to discharge the gas or product discharged from the
tank 21 in the event of gas type switch to the outside of the ship. In other words,
gas type switch can be performed even in a case where it is difficult to release the
gas discharged from the tank 21 into the atmosphere. As a result, it is possible to
efficiently switch the type of gas loaded into the tank 21 and gas type switch can
be facilitated and expedited.
[0045] The ship 1 of the above embodiment further includes the heating unit 52 heating the
water W in the water tank 50 and the separated gas discharge line 53 discharging the
gas separated from the water W by the heating unit 52 heating the water W.
[0046] In such a configuration, in the event of gas type switch, the water W in the water
tank 50 in which the product of a mixed gas-water chemical reaction is dissolved can
be heated by the heating unit 52. Accordingly, the ammonium carbonate or ammonium
bicarbonate dissolved in the water W can be pyrolyzed to separate the gas such as
carbon dioxide gas and ammonia gas from the water W. The gas separated from the water
W in the water tank 50 can be discharged from the separated gas discharge line 53.
Accordingly, the gas separated from the water W can be treated at an appropriate timing
regardless of, for example, the situation of gas type switch.
(Other Embodiments)
[0047] Although an embodiment of the present disclosure has been described in detail with
reference to the drawings, the specific configuration is not limited to this embodiment
and also includes, for example, design changes within the gist of the present disclosure.
[0048] Although the water tank 50 is provided with the heating unit 52 in the above embodiment,
the heating unit 52 may be provided in an outboard treatment facility or the like.
In that case, the water W in the water tank 50 is discharged to the outside of the
ship with the component and product contained in the gas discharged from the discharge
line 35 dissolved and is treated at the outboard treatment facility or the like.
[0049] Exemplified in the above embodiment is a case where the discharge line 35 is branch-connected
to the upper supply line 32. Alternatively, the discharge line 35 may be directly
connected to the tank 21 with the upper supply line 32 omitted.
[0050] Described in the above embodiment is a case where the liquefied ammonia La or the
liquefied carbon dioxide Lc is supplied into the tank 21 from the lower portion of
the tank 21 by the lower supply line 33. Alternatively, the liquefied ammonia La or
the liquefied carbon dioxide Lc may be supplied into the tank 21 from, for example,
the upper portion or center of the tank 21 instead of the lower portion.
<Additional Notes>
[0051] The ship 1 described in the embodiment is, for example, grasped as follows.
- (1) A ship 1 according to a first aspect includes: a hull 2; a tank 21 provided in
the hull 2 and storing either ammonia or carbon dioxide; a supply line 33 supplying
the other of the ammonia and the carbon dioxide into the tank 21; a discharge line
35 discharging, when the other of the ammonia and the carbon dioxide is supplied into
the tank 21 through the supply line 33, a mixed gas in which one of the ammonia and
the carbon dioxide stored in the tank 21 and the other of the ammonia and the carbon
dioxide supplied into the tank 21 by the supply line 33 are mixed; and a water tank
50 provided in the hull 2 and storing water W, the mixed gas discharged from the discharge
line 35 being introduced into the water tank 50.
[0052] As for the ship 1, in a case where the type of gas loaded into the tank 21 is switched,
the other of ammonia and carbon dioxide is supplied through the supply line 33 into
the tank 21 in which one of ammonia and carbon dioxide is stored. Then, the mixed
gas of ammonia and carbon dioxide is discharged from the discharge line 35. The mixed
gas discharged from the tank 21 is sent into the water tank 50 through the discharge
line 35. As a result of contact between the mixed gas sent into the tank 21 and the
water W, ammonium carbonate or ammonium bicarbonate as an example is generated as
a product. This product dissolves in the water W by being introduced into the water
tank 50.
[0053] In this manner, when the type of gas loaded into the tank 21 is switched, the mixed
gas discharged from the tank 21 is allowed to chemically react with the water W and
can be stored in the water tank 50. Accordingly, there is no need to discharge the
gas or product discharged from the tank 21 in the event of gas type switch to the
outside of the ship. In other words, gas type switch can be performed even in a case
where it is difficult to release the gas discharged from the tank 21 into the atmosphere.
As a result, it is possible to efficiently switch the type of gas loaded into the
tank 21 and gas type switch can be facilitated and expedited.
[0054] (2) The ship 1 according to a second aspect, which is the ship 1 of (1), further
includes a heating unit 52 heating the water W in the water tank 50; and a separated
gas discharge line 53 discharging a gas separated from the water W by the heating
unit 52 heating the water W.
[0055] As a result, the water W in the water tank 50 in which the product is dissolved can
be heated. Accordingly, the ammonium carbonate or ammonium bicarbonate dissolved in
the water W can be pyrolyzed to separate the gas such as carbon dioxide gas and ammonia
gas from the water W. In addition, the gas separated from the water W in the water
tank 50 can be discharged from the separated gas discharge line 53. Accordingly, the
gas separated from the water W can be treated at an appropriate timing regardless
of, for example, the situation of switching the type of gas in the tank 21.
Industrial Applicability
[0056] According to the ship of the present disclosure, it is possible to efficiently switch
the type of gas loaded into the tank and work can be facilitated and expedited. Reference
Signs List
[0057]
1: ship
2: hull
2a: bow
2b: stern
3A, 3B: side
5: deck
7: upper structure
8: cargo loading section
21: tank
32: upper supply line
32a: opening portion
32v: opening-closing valve
33: supply line
33: lower supply line (supply line)
33a: opening portion
33v: opening-closing valve
35: discharge line
35v: opening-closing valve
50: water tank
52: heating unit
53: separated gas discharge line
Da: ship stern direction
Ga: ammonia gas
Gc: carbon dioxide gas
Gm: mixed gas
La: liquefied ammonia
Lc: liquefied carbon dioxide
W: water