JP2021160692A - Hold drying system and hold drying method - Google Patents

Abstract

To provide a hold drying system capable of drying an inner surface of a hold of a cargo ship efficiently.SOLUTION: A hold drying system is a hold drying system 1 for drying an inner surface of a hold C in a cargo ship S equipped with the hold C where a cargo is loaded, and includes: a dry air generation device 2 for generating high temperature low humidity compressed air whose temperature is high, pressure is high, and relative humidity is low compared with air in the hold C; and a pipeline 3 for fluid-connecting the hold C and the dry air generation device 2, which is disposed so as to guide the high temperature low humidity compressed air from the dry air generation device 2 to the inside of the hold C.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hold drying system and a hold drying method.

For example, a liquid cargo ship that transports liquid cargo such as crude oil and chemicals by sea may transport various types of liquid cargo. For liquid cargo ships, when changing the type of liquid cargo, it is necessary to clean the hold to avoid alteration of the liquid cargo due to contamination or chemical changes. The hold is washed with a cleaning solution, seawater, and fresh water, for example, as disclosed in Patent Document 1. For example, if moisture remains on the inner surface of the hold, or if condensation forms on the inner surface of the hold and moisture adheres to it, the liquid cargo to be loaded next may be mixed with the moisture and deteriorate. There is even a risk of explosion depending on the type of cargo. Therefore, it is necessary to dry the inner surface of the hold, at least before loading liquid cargo. This applies not only to liquid cargo but also to cargo ships that transport cargo other than liquid cargo.

Drying in the hold of a cargo ship is carried out by natural drying or high-speed drying with dry air as disclosed in Patent Document 1, or warm air is blown as disclosed in Patent Document 2. It is carried out by.

Japanese Unexamined Patent Publication No. 62-149597 Japanese Unexamined Patent Publication No. 11-342897

However, these methods using general dry air or warm air do not provide sufficient drying efficiency and take a long time to dry. In addition, liquid cargo ships may have multiple holds, and it would be very inefficient to dry each of the multiple holds separately, and each of the multiple holds would have its own drying device. If it is provided, the cost will increase.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a hold drying system and a hold drying method capable of efficiently drying the inner surface of a hold of a cargo ship.

The hull drying system of the present invention is a hull drying system for drying the inner surface of the hull in a freight ship provided with a hull on which cargo is loaded, and the temperature is higher and the pressure is higher than the air in the hull. The dry air generator that generates high-temperature and low-humidity compressed air with high and low relative humidity is fluidly connected to the hull and the dry air generator, and the high-temperature and low-humidity compressed air is introduced into the hull from the dry air generator. It is characterized by having a pipe arranged so as to guide the air.

Further, the dry air generator reduces the water content of the compressed air by cooling the compressed air and the compressor for compressing the air in the atmosphere to generate the compressed air, and the low-moisture compressed air. By heating the low-moisture compressed air to a temperature higher than that of the air in the hull, the relative humidity of the low-moisture compressed air is lowered to be lower than the relative humidity of the air in the hull. It is preferable to provide a heater for generating high-temperature and low-humidity compressed air.

The cargo ship includes a plurality of holds, and the pipe connects the plurality of holds in series to guide the high temperature and low humidity compressed air to one hold on the upstream side of the plurality of holds. Therefore, it is preferable that the high temperature and low humidity compressed air discharged from the one hold is sequentially guided into another hold on the downstream side fluidly connected in series with the one hold.

Further, the cargo ship includes a plurality of hold sets including at least two holds, and at least two holds included in each hold set are each provided with a through hole, and each other is provided with a through hole through the through hole. The pipe is fluidly connected, and the pipe connects a plurality of hold sets in series, and the high temperature and low temperature are contained in at least two holds of one hold set on the upstream side of the plurality of hold sets. By guiding the humidity-compressed air, the high-temperature and low-humidity compressed air discharged from at least two holds in the one hold set is fluidly connected in series to the one hold set in another hold on the downstream side. It is preferable that they are arranged so as to be guided in order in at least two holds of the set.

Further, the dry air generator is configured to be able to generate nitrogen gas by passing the generated high-temperature and low-humidity compressed air through a gas filter for removing a gas other than nitrogen gas. The dry air generator is preferably configured so that the high temperature and low humidity compressed air and the nitrogen gas can be switched and sent to the pipe.

The bunker drying method of the present invention is a method for drying the inner surface of the bunker in a cargo ship including a bunker on which cargo is loaded, and has a higher temperature and a higher pressure than air in the bunker. It is characterized by generating high-temperature and low-humidity compressed air having a low relative humidity and guiding the high-temperature and low-humidity compressed air into the cargo hold through a pipe.

Further, the generation of the high temperature and low humidity compressed air is low by compressing the air in the atmosphere to generate the compressed air and by cooling the compressed air to reduce the amount of water in the compressed air. By generating moisture-compressed air and heating the low-moisture compressed air to a temperature higher than that of the air in the hull, the relative humidity of the low-moisture compressed air is lowered to be lower than the relative humidity of the air in the hull. It is preferable to include the production of the high temperature and low humidity compressed air.

Further, the cargo ship is provided with a plurality of holds, and guiding the high temperature and low humidity compressed air into the hold means that the plurality of holds are fluidly connected in series with each other via the pipes, and the plurality of holds are connected in series. By guiding the high temperature and low humidity compressed air into one hold on the upstream side of the hold, the high temperature and low humidity compressed air discharged from the one hold was fluidly connected to the one hold in series. It is preferable to include in turn leading to other holds on the downstream side.

Further, the cargo ship includes a plurality of hold sets including at least two holds, and at least two holds included in each hold set are each provided with a through hole, and each other is provided with a through hole through the through hole. It is fluidly connected, and guiding the high temperature and low humidity compressed air into the hold means connecting the plurality of hold sets in series with each other via the pipe, and among the plurality of hold sets. By guiding the high temperature and low humidity compressed air into at least two holds of one hold set on the upstream side of the above, the high temperature and low humidity compressed air discharged from at least two holds of the one hold set is released. It is preferable to include in turn leading into at least two holds of the other hold sets on the downstream side, which are fluidly connected in series with the one hold set.

Further, it is preferable to further include guiding nitrogen gas into the hold through the pipe after drying the inner surface of the hold by carrying out the hold drying method.

According to the present invention, it is possible to provide a hold drying system and a hold drying method capable of efficiently drying the inner surface of a hold of a cargo ship.

It is a top view which shows typically an example of the hold drying system which concerns on one Embodiment of this invention. It is a figure which shows the set of the hold of the hold drying system of FIG. 1, and is the arrow view from the direction A of FIG.

Hereinafter, the hold drying system and the hold drying method according to the embodiment of the present invention will be described with reference to the accompanying drawings. However, the embodiment shown below is an example, and the hold drying system and the hold drying method of the present invention are not limited to the following examples.

<Hunakura drying system>
As shown in FIG. 1, the hold drying system 1 of the present embodiment is used for drying the inner surface of the hold C in the cargo ship S including the hold C on which the cargo is loaded. The hold drying system 1 reduces the amount of water adhering to the inner surface of the hold C by vaporizing at least a part or all of the water adhering to the inner surface of the hold C, or removes the water adhering to the inner surface of the hold C. remove.

The cargo ship S is a ship that loads cargo in the hold C and transports the loaded cargo by sea. The cargo carried by the cargo ship S by sea is not particularly limited, and liquid cargo such as crude oil and chemicals is exemplified. In particular, when the cargo is liquid, it is likely to be contaminated by mixing with water, or it may chemically react with water to change its quality, and it is highly necessary to remove the water adhering to the inner surface of the hold C. Therefore, the hold drying system 1 of the present embodiment is suitably adopted for a liquid cargo ship that carries liquid cargo and transports it by sea. In the following, the hold drying system 1 will be described by taking the liquid cargo ship as an example. However, the hold drying system 1 is not limited to a liquid cargo ship as long as it is a cargo ship that needs to dry the inner surface of the hold, and can be applied to a cargo ship carrying other types of cargo. can.

Hold C (also referred to as a "cargo tank") is provided on the cargo ship S and accommodates the loaded cargo. The hold C has a space for accommodating cargo inside, and is partitioned by a wall surface surrounding the space. The number and size of the hold C to be provided on the cargo ship S are appropriately set according to the type and amount of cargo loaded on the cargo ship S. The cargo ship S may have a single hold, or may have a plurality of holds C11 to C52 (10 in the illustrated example), as in the example shown in FIG. Further, the cargo ship S may include a plurality of sets C1 to C5 of holds including at least two holds, as will be described in detail below. In the hold C, moisture may adhere to the inner surface due to cleaning when the cargo is replaced, or dew condensation may occur due to the temperature difference between the internal air and the inner surface (wall surface), and the moisture may adhere to the inner surface. Such moisture can be a factor in contaminating the cargo and can even cause an explosion by chemically reacting with the cargo (especially chemicals). Therefore, in the hold C, it is preferable that the moisture adhering to the inner surface is removed before loading the cargo.

In the example shown in FIG. 1, the plurality of holds C11 to C52 are arranged side by side in two rows from the bow side to the stern side (from left to right in the figure). Then, each of the starboard side (upper side in the figure) holds C11, C21, C31, C41, and C51 is communicated with each of the port side (lower side in the figure) holds C12, C22, C32, C42, and C52. It forms the sets C1, C2, C3, C4 and C5 of the hold. However, the arrangement of the plurality of holds C11 to C52 is not limited to the illustrated example, and the plurality of holds C11 to C52 may be independent of each other without forming a set of holds. Three or more holds may be arranged to form a hold pair.

Each of the plurality of holds C11 to C52 has a structure similar to that of each other in the examples shown in FIGS. 1 and 2. Taking the hold C11 as an example, the hold C11 has a side wall W1, a bottom wall W2, and an upper wall W3 that define a space for accommodating cargo, and a through hole H provided in the side wall W1 for communicating with the hold C12. And have. The inner surface of the hold C means a surface in contact with the internal spaces of the side wall W1, the bottom wall W2, and the upper wall W3. The hold C11 communicates with the hold C12 through the through holes H and H, respectively, to form a hold C1. The same applies to the other holds C2 to C5. In this way, at least two holds are communicated with each other through a through hole H different from the pipe 3 described later, so that the fluids inside the two holds are evenly mixed. The hold C to which the hold drying system 1 of the present embodiment is applicable may have a space for accommodating cargo and has an inner surface surrounding the space, and is limited to the illustrated example. There is no.

Next, the hold drying system 1 of the present embodiment will be described with reference to FIG. As shown in FIG. 1, the hold drying system 1 includes a dry air generator 2 that generates dry air, and a pipe 3 that fluidly connects the hold C and the dry air generator 2. The hold drying system 1 dries the inner surface of the hold C by guiding the dry air from the dry air generator 2 into the hold C via the pipe 3. In the present embodiment, the hold drying system 1 is installed and used on the cargo ship S, but may be installed and used on a ship other than the cargo ship S or on land.

The dry air generator 2 generates high-temperature, low-humidity compressed air having a higher temperature, a higher pressure, and a lower relative humidity than the air in the hull C. The high-temperature and low-humidity compressed air is guided into the hold C and flows near the inner surface of the hold C to vaporize the moisture adhering to the inner surface of the hold C and take it in as water vapor. The high temperature and low humidity compressed air has a higher temperature than the air in the hold C and a lower relative humidity, so that it has a larger capacity for taking in the moisture adhering to the inner surface of the hold C as water vapor, and also has a larger capacity than the air in the hold C. However, due to the high pressure, when it is sent into the hold C, it expands and can quickly reach the vicinity of the inner surface of the hold C. As a result, the high-temperature and low-humidity compressed air can quickly vaporize the moisture adhering to the inner surface of the hold C, and efficiently dry the inner surface of the hold C.

The temperature, pressure, and relative humidity of the high-temperature and low-humidity compressed air are, for example, in the vicinity of the inner surface to which moisture is attached in the hull C (for example, preferably within 10 cm from the inner surface, more preferably within 50 cm, and even more preferably within 100 cm. ) Can be set as a reference. Moisture adhering to the inner surface of the hold C remains without being vaporized, and new moisture adheres due to dew condensation is largely influenced by the air existing in the vicinity of the inner surface of the hold C. Therefore, it is preferable that the temperature, pressure, and relative humidity of the high-temperature and low-humidity compressed air are set based on the air in the vicinity of the inner surface to which moisture is attached in the hull C. However, the temperature, pressure, and relative humidity of the high-temperature and low-humidity compressed air may be based on the air in another place as long as it is in the hold C.

The temperature, pressure, and relative humidity of the high-temperature and low-humidity compressed air can be set based on the air inside the hull C as well as the air in the atmosphere outside the hull C. The temperature of the high temperature and low humidity compressed air can be set to a temperature higher than that of the air in the atmosphere, for example, more specifically, when the temperature of the air in the atmosphere is 25 ° C or less, 28 ° C or more. When the temperature of the air in the atmosphere is 25 ° C. or higher, the temperature in the atmosphere can be set to + 3 ° C. or higher. Further, the pressure of the high-temperature and low-humidity compressed air can be set to a pressure higher than the atmospheric pressure, for example, more specifically, preferably 2 atm or more, more preferably 4 atm or more, and even more preferably 8. It can be set above atmospheric pressure. However, from the viewpoint of ease of handling, the pressure of the high-temperature and low-humidity compressed air is preferably lower than the pressure (10 atm) in which the gas having a higher pressure is defined as a high-pressure gas. The relative humidity of the hot and low humidity compressed air can be set to, for example, a lower relative humidity than the air in the atmosphere, more specifically, 50 RH% or less, preferably 50 RH% or less, depending on the relative humidity of the air in the atmosphere. Can be set to 30 RH% or less, more preferably 10 RH% or less, and even more preferably 5 RH% or less.

The temperature, pressure and relative humidity of the hot and low humidity compressed air are measured, for example, at a predetermined location inside the hull C and / or in the air outside the hull C to measure the temperature, pressure and relative humidity, respectively. It may be adjusted in real time by being fed back from the measurement result of the sensor of the above, or may be set based on the values of temperature, pressure and relative humidity measured in advance.

The dry air generator 2 only needs to be able to generate high-temperature and low-humidity compressed air having a higher temperature, higher pressure, and lower relative humidity than the air in the hull C, and its configuration is not particularly limited. .. In the present embodiment, the dry air generator 2 includes a compressor 21 for compressing air in the atmosphere and a cooler 22 for cooling the air compressed by the compressor 21, as shown in FIG. And a heater 23 for heating the air cooled by the cooler 22. The dry air generator 2 may further include an oil filter for removing oil contained in the air compressed by the compressor 21. By providing the dry air generator 2 with an oil filter, it is possible to generate cleaner high-temperature and low-humidity compressed air.

The compressor 21 compresses the air in the atmosphere to generate compressed air. By compressing the air in the atmosphere with the compressor 21, high-pressure dry air can be sent into the hold C, and the inner surface of the hold C can be efficiently dried. The pressure of the compressed air generated by the compressor 21 may be at least higher than the atmospheric pressure (and the pressure of the air in the hull C), and is not particularly limited, but efficiently dries the inner surface of the hull C. From this point of view, it can be preferably 2 atm or more, more preferably 4 atm or more, and even more preferably 8 atm or more. However, from the viewpoint of ease of handling, the pressure of compressed air is preferably lower than the pressure (10 atm) defined as a high-pressure gas in a gas having a pressure higher than that. The compressor 21 is not particularly limited as long as it can compress the air in the atmosphere, but a screw compressor can be preferably adopted. By adopting a screw compressor as the compressor 21, compressed air can be efficiently generated.

The cooler 22 cools the compressed air to reduce the amount of water in the compressed air to generate low-moisture compressed air. The temperature cooled by the cooler 22 is not particularly limited as long as it can reduce the amount of water contained in the compressed air that has become heated to a high temperature, but is not particularly limited, but is, for example, the atmospheric temperature (and the temperature in the shipyard C). A temperature lower than (air temperature), preferably 20 ° C. or lower, more preferably 10 ° C. or lower, still more preferably 5 ° C. or lower is adopted. The cooler 22 is not particularly limited as long as it can cool the compressed air, and may cool the compressed air by exchanging heat with, for example, cooling water or another refrigerant.

The heater 23 heats the low-moisture compressed air to a temperature higher than that of the air in the hull C to lower the relative humidity of the low-moisture compressed air to be lower than the relative humidity of the air in the hull C, thereby compressing the low-moisture and low-humidity. Produces air. In this way, by cooling the compressed air once to reduce the water content of the compressed air and then further heating it to lower the relative humidity of the compressed air, the capacity of the compressed air to receive water vapor can be further increased. .. Therefore, the high-temperature and low-humidity compressed air generated in this way can vaporize more moisture adhering to the inner surface of the hold C, and can dry the inner surface of the hold C more efficiently. The heater 23 is not particularly limited as long as it can heat the low-moisture compressed air to a temperature higher than the air in the hull C, and exchanges heat with, for example, the compressed air before being cooled by the cooler 22. Thereby, the low-moisture compressed air may be heated. In that case, since the compressed air is cooled by heat exchange before the compressed air is cooled by the cooler 22, the energy consumption for cooling the cooler 22 can be suppressed.

As shown in FIG. 1, the dry air generator 2 passes the generated high-temperature and low-humidity compressed air through a gas filter 4 (for example, an activated charcoal filter) for removing a gas other than nitrogen gas (for example, oxygen gas). As a result, it may be configured to be able to generate high-purity nitrogen gas. The dry air generator 2 is configured so that the high temperature and low humidity compressed air and the nitrogen gas can be switched and sent to the pipe 3 by opening and closing the valves V1 and V2. The dry air generator 2 sends the high temperature and low humidity compressed air to the pipe 3 in a state where the valve V1 is opened and the valve V2 is closed, and after drying the inner surface of the hull C with the high temperature and low humidity compressed air, the valve V1 With the valve V2 open, nitrogen gas is generated, and the generated nitrogen gas is sent to the pipe 3, whereby the air in the hull C can be replaced with the nitrogen gas. By filling the inside of the hull C with nitrogen gas (inert gas) after making the inner surface of the hull C almost free of water, for example, liquid cargo with a risk of explosion can be safely loaded in the hull C. be able to. In this way, the same dry air generator 2 can switch between high temperature and low humidity compressed air and nitrogen gas and send them to the pipe 3, so compared to the case where devices for generating each gas are separately provided. The equipment cost can be suppressed and the installation space can be reduced.

The pipe 3 is a pipe for guiding a gas such as high temperature and low humidity compressed air to a predetermined place. As shown in FIG. 1, the pipe 3 fluidly connects the hull C and the dry air generator 2 to guide high-temperature and low-humidity compressed air (and nitrogen gas described later) from the dry air generator 2 to the hull C. Is placed in. The pipe 3 is further arranged so as to discharge the gas in the hold C to the outside of the hold C. In the present embodiment, the pipe 3 is a water supply / drainage pipe 31 for sending liquid cargo into the hold C and sending it out of the hold C, and a supply / exhaust pipe for sending gas into the hold C and sending it out of the hold C. It is arranged by utilizing 32. By utilizing the existing piping equipment in this way, it is not necessary to install new piping to dry the inner surface of the hold C, and the equipment cost can be suppressed. However, the pipe 3 may be provided separately from the existing water supply / drainage pipe 31 and supply / exhaust pipe 32.

In the present embodiment, the pipe 3 is arranged so as to fluidly connect a plurality of hold sets C1 to C5 in series as shown in FIG. More specifically, the water supply / drainage pipe 31 of the pipe 3 is branched from the water supply / drainage main pipe 310, one end of which is fluidly connected to the dry air generator 2 via the valve V1 or V2, and the water supply / drainage main pipe 310. The water supply / drainage branch pipes 311 to 315 are fluidly connected to the sets C1 to C5 of each shipyard, and one end of the air supply / exhaust pipe 32 of the pipe 3 is fluidly connected to the atmosphere outside the shipyard C. The main pipe 320 and the supply / exhaust branch pipes 321 to 325 branching from the air supply / exhaust main pipe 320 and fluidly connected to the sets C1 to C5 of each shipyard are provided. Then, as shown in the figure, a portion of the delivery / drainage main pipe 310 (two-point chain line portion in the figure) between the first delivery / drainage branch pipe 311 and the second delivery / drainage branch pipe 312, the third Part of the water supply / drainage main pipe 310 (two-point chain line part in the figure) between the water supply / drainage branch pipe 313 and the fourth water supply / drainage branch pipe 314, the second supply / exhaust branch pipe 322 and the third The part of the air supply / exhaust main pipe 320 between the air supply / exhaust branch pipe 323 (the two-point chain line part in the figure), and the air supply / exhaust main pipe between the fourth air supply / exhaust branch pipe 324 and the fifth air supply / exhaust branch pipe 325. The 320 portion (two-point chain line portion in the figure) is divided. As a result, by guiding high temperature and low humidity compressed air into at least two holds C11 and C12 of one hold set C1 on the upstream side of the plurality of hold sets C1 to C5, one hold set C1 High temperature and low humidity compressed air discharged from at least two holds C11 and C12 are fluidly connected to one hold set C1 in series with at least two holds C21 and C22 of other hold sets C2 to C5 on the downstream side. ~ C51, C52 are sent in order. The high-temperature and low-humidity compressed air discharged from the first bunker and guided to the subsequent bunker has changed from the state of the high-temperature and low-humidity compressed air when it was guided to the first bunker (for example, the pressure has decreased). ) However, here, the gas changed from the first-derived high-temperature and low-humidity compressed air is also referred to as high-temperature and low-humidity compressed air.

More specifically, the flow of the high-temperature and low-humidity compressed air will be described in more detail. It is guided to both the hulls C11 and C12 of the first hull set C1 through the drainage branch pipe 311. At this time, since the shipyards C11 and C12 communicate with each other through the through holes H and H, even if the high temperature and low humidity compressed air is not evenly introduced into each other by the first feed / drainage branch pipe 311. High temperature and low humidity compressed air are mixed more evenly in both through the through holes H and H. Therefore, the inner surfaces of both holds C11 and C12 are dried more evenly. Next, a part of the high-temperature and low-humidity compressed air guided to the holds C11 and C12 of the first hold group C1 is discharged from the holds C11 and C12, and the first supply / exhaust branch pipe 321 and the supply / exhaust main pipe are discharged. It is guided to both holds C21 and C22 of the second hold set C2 through 320 and the second supply / exhaust branch pipe 322. Also at this time, since the holds C21 and C22 communicate with each other through the through holes H and H, even if the second air supply / exhaust branch pipe 322 does not evenly introduce the high temperature and low humidity compressed air to each other. High temperature and low humidity compressed air are mixed more evenly in both through the through holes H and H. Subsequently, similarly, a part of the high-temperature and low-humidity compressed air guided to the second hull set C2 is discharged from the second hull set C2 to feed the second drainage branch pipe 312. High temperature and low humidity compression guided to both the bunker C31 and C32 of the third hull group C3 through the drainage main pipe 310 and the third drainage branch pipe 313, and guided to the third hull set C3. A part of the air is discharged from the third hull set C3 and passes through the third supply / exhaust branch pipe 323, the supply / exhaust main pipe 320, and the fourth supply / exhaust branch pipe 324, and the fourth hull set C4. A part of the high temperature and low humidity compressed air guided to both the hulls C41 and C42 of the 4th hull and guided to the 4th hull set C4 is discharged from the 4th hull set C4 to send and drain the 4th hull. Through the branch pipe 314, the main pipe 310 for drainage and drainage, and the fifth pipe for drainage and drainage 315, it is guided to both the vessels C51 and C52 of the fifth hull group C5, and is guided to the fifth hull set C5. A part of the high-temperature and low-humidity compressed air is discharged from the fifth hull set C5, and is discharged to the atmosphere outside the hull C through the fifth supply / exhaust branch pipe 325 and the supply / exhaust main pipe 320.

In this way, the high-temperature and low-humidity compressed air is guided in order from the upstream to the downstream of the plurality of hull sets C1 to C5 fluidly connected in series, thereby contributing to the drying of the inner surface of the hull in the upstream hull set. Since the high-temperature and low-humidity compressed air discharged without any can be effectively used to dry the inner surface of the hull in the downstream hull group, the high temperature and low-humidity compressed air are compared to the case where the high-temperature and low-humidity compressed air is separately sent to multiple hull sets. The amount of low-humidity compressed air used can be reduced, and the inner surface of the hulls of a plurality of hulls can be efficiently dried. Then, two holds are made into a set of one hold, and the two holds are communicated with each other through a through hole separately from the piping, so that the inner surfaces of the two holds are dried more evenly, and a plurality of holds are used. The inner surface of the hold can be dried efficiently. Further, instead of providing separate branch pipes for each of the plurality of holds C11 to C52, one branch pipe may be provided for one hold set, so that the pipe 3 should be arranged compactly. Can be done.

In the present embodiment, a plurality of sets of holds including two holds are fluidly connected in series, but a plurality of sets of holds including three or more holds may be fluidly connected in series. Further, the pipe 3 fluidly connects a plurality of holds C11 to C52 in series without forming a hold of the hold, and sends high-temperature and low-humidity compressed air to one hold on the upstream side of the plurality of holds. By guiding, the high temperature and low humidity compressed air discharged from one hold may be arranged so as to be sequentially guided into another hold on the downstream side fluidly connected in series with one hold. As a result, high-temperature and low-humidity compressed air is sequentially guided from the upstream to the downstream of the plurality of hulls C11 to C52 fluidly connected in series, so that the high-temperature and low-humidity compressed air discharged without contributing to the drying of the inner surface of the upstream hull is discharged. Since compressed air can be effectively used to dry the inner surface of the downstream hull, the amount of high-temperature and low-humidity compressed air used can be reduced compared to the case where high-temperature and low-humidity compressed air is sent separately to multiple hulls. , It is possible to efficiently dry the inner surfaces of multiple hulls.

In the above, it has been explained that the high temperature and low humidity compressed air generated by the dry air generator 2 is guided to the shipyard C via the pipe 3, but the dry air generator 2 uses nitrogen instead of the high temperature and low humidity compressed air. By sending the gas to the pipe 3, the nitrogen gas can be guided into the hull C in the same manner as the high temperature and low humidity compressed air, whereby the air in the hull C can be replaced with the nitrogen gas. Further, in the dry air generator 2, when a plurality of hulls C1 to C5 are fluidly connected in series by a pipe 3, or when a plurality of hulls C11 to C52 are fluidly connected in series by a pipe 3. By sending nitrogen gas into the bunker on the upstream side via the pipe 3, the nitrogen gas is guided in order from the upstream side to the downstream side, and the air in the plurality of bunches C11 to C52 is efficiently replaced with the nitrogen gas. can do.

<Holding method>
Next, the hold drying method of the present embodiment will be described with reference to FIG. In the following description, for the sake of easy understanding, the hold drying method of the present embodiment will be described by taking the above-mentioned hold drying system as an example, but the hold drying method of the present embodiment uses the above-mentioned hold drying system. It can also be carried out without doing. Further, in the following, the same elements as those described in relation to the hold drying system shall have the same functions and characteristics as those described above, unless otherwise specified.

The hold drying method of the present embodiment is a method for drying the inner surface of the hold C in a cargo ship S including a hold C on which cargo is loaded. In this shipyard drying method, high-temperature and low-humidity compressed air having a higher temperature, higher pressure, and lower relative humidity than the air in the shipyard C is generated, and high-temperature and low-humidity compressed air is supplied to the shipyard C via the pipe 3. Includes guiding in. The high-temperature and low-humidity compressed air is guided into the hold C and flows near the inner surface of the hold C to vaporize the moisture adhering to the inner surface of the hold C and take it in as water vapor. The high temperature and low humidity compressed air has a higher temperature than the air in the hold C and a lower relative humidity, so that it has a larger capacity for taking in the moisture adhering to the inner surface of the hold C as water vapor, and also has a larger capacity than the air in the hold C. However, due to the high pressure, when it is sent into the hold C, it expands and can quickly reach the vicinity of the inner surface of the hold C. As a result, the high-temperature and low-humidity compressed air can quickly vaporize the moisture adhering to the inner surface of the hold C, and efficiently dry the inner surface of the hold C.

The method for producing high-temperature and low-humidity compressed air is not particularly limited, but first, it starts by compressing the air in the atmosphere to generate compressed air. The method of compressing air is not particularly limited, but from the viewpoint of efficiency, for example, a screw compressor can be used. The compressed air generated may be removed by passing it through an oil filter for removing the oil. Next, by cooling the compressed air, the amount of water in the compressed air is reduced to generate low-moisture compressed air. The method for cooling the compressed air is not particularly limited, but the compressed air can be cooled, for example, by exchanging heat with cooling water or another refrigerant. Finally, by heating the low-moisture compressed air to a temperature higher than the air in the hull C, the relative humidity of the low-moisture compressed air is lower than the relative humidity of the air in the hull C, and the high-temperature low-humidity compressed air is made. The generation is done. The method for heating the low-moisture compressed air is not particularly limited, but the heating can be performed, for example, by exchanging heat with the compressed air before cooling. By cooling the compressed air once to reduce the water content of the compressed air and then further heating it to lower the relative humidity of the compressed air, the capacity of the compressed air to receive water vapor can be further increased. Therefore, the high-temperature and low-humidity compressed air generated in this way can vaporize more moisture adhering to the inner surface of the hold C, and can dry the inner surface of the hold C more efficiently.

When guiding the high-temperature and low-humidity compressed air into the hold C, a plurality of holds C11 to C52 are fluidly connected in series with each other via a pipe 3, and the inside of one hold on the upstream side of the plurality of holds C11 to C52. By guiding the high-temperature and low-humidity compressed air to the other hold, the high-temperature and low-humidity compressed air discharged from one hold may be sequentially guided into another hold on the downstream side fluidly connected in series with one hold. In this way, the high temperature and low humidity compressed air is guided in order from the upstream to the downstream of the plurality of hulls C11 to C52 fluidly connected in series, so that the high temperature and low temperature are discharged without contributing to the drying of the inner surface of the upstream hull. Since the humidity-compressed air can be effectively used to dry the inner surface of the downstream hull, the amount of high-temperature and low-humidity compressed air used can be reduced compared to the case where the high-temperature and low-humidity compressed air is separately sent to multiple hulls. It is possible to efficiently dry the inner surfaces of multiple hulls.

Further, when guiding the high-temperature and low-humidity compressed air into the hold C, at least two holds are set as one hold, and a plurality of hold sets C1 to C5 are fluidly connected in series with each other via the pipe 3. At least two of one hold set C1 by guiding high temperature and low humidity compressed air into at least two holds C11 and C12 of one hold set C1 on the upstream side of a plurality of hold sets C1 to C5. At least two holds C21, C22 to C51 of the other hold sets C2 to C5 on the downstream side, in which the high-temperature and low-humidity compressed air discharged from the holds C11 and C12 are fluidly connected in series with the set C1 of one hold. It may be guided into C52 in order. In this way, the high-temperature and low-humidity compressed air is guided in order from the upstream to the downstream of the plurality of hull sets C1 to C5 fluidly connected in series, thereby contributing to the drying of the inner surface of the hull in the upstream hull set. Since the high-temperature and low-humidity compressed air discharged without any can be effectively used to dry the inner surface of the hull in the downstream hull group, the high temperature and low-humidity compressed air are compared to the case where the high-temperature and low-humidity compressed air is separately sent to multiple hull sets. The amount of low-humidity compressed air used can be reduced, and the inner surface of the hulls of a plurality of hulls can be efficiently dried. Then, the two holds are made into a set of one hold, and the two holds are communicated with each other through a through hole H different from the pipe 3, so that the inner surfaces of the two holds are dried more evenly. Therefore, the inner surfaces of a plurality of holds can be efficiently dried.

After drying the inner surface of the hold C by carrying out the above-mentioned hold drying method, nitrogen gas may be guided into the hold C via the pipe 3. Thereby, the air in the hold C can be replaced with nitrogen gas. By filling the inside of the hold C with nitrogen gas (inert gas) after making the inner surface of the hold C almost free of water by the above-mentioned hold drying method, for example, liquid cargo with a risk of explosion can be filled in the hold C. Can be safely loaded inside. When a plurality of hulls C11 to C52 are fluidly connected in series by a pipe 3, or when a plurality of hull sets C1 to C5 are fluidly connected in series by a pipe 3, the upstream side is connected via the pipe 3. By sending the nitrogen gas into the hull, the nitrogen gas is guided in order from the upstream side to the downstream side, and the air in the plurality of hulls C11 to C52 can be efficiently replaced with the nitrogen gas.

1 Funakura drying system 2 Dry air generator 21 Compressor 22 Cooler 23 Heater 3 Piping 31 Water supply / drainage pipe 310 Water supply / drainage main pipe 313-1-15 First to fifth liquid supply / drainage branch pipes 32 Supply / exhaust pipe 320 Supply Exhaust main pipe 321 to 325 First to fifth air supply / exhaust branch pipe 4 Gas filter for removing gas other than nitrogen gas C Shipyard C1 to C5 First to fifth shipyard set C11 to C52 Shipyard H through hole S Freighter V1, V2 Valve W1 Side wall W2 Bottom wall W3 Top wall

Claims (10)

A hold drying system for drying the inner surface of the hold in a cargo ship having a hold on which cargo is loaded.
A dry air generator that produces high-temperature, low-humidity compressed air that has a higher temperature, higher pressure, and lower relative humidity than the air in the hull.
A shipyard drying system including a pipe that fluidly connects the shipyard and the dry air generator and is arranged so as to guide the high temperature and low humidity compressed air from the dry air generator into the shipyard. The dry air generator
A compressor for compressing air in the atmosphere to generate compressed air,
A cooler for reducing the water content of the compressed air to generate low-moisture compressed air by cooling the compressed air, and
By heating the low-moisture compressed air to a temperature higher than that of the air in the hull, the relative humidity of the low-moisture compressed air is lowered to be lower than the relative humidity of the air in the hull to generate high-temperature and low-humidity compressed air. The shipyard drying system according to claim 1, further comprising a heater for the purpose of using the air conditioner. The cargo ship has multiple holds
The pipe is discharged from the one hold by fluidly connecting the plurality of holds in series and guiding the high temperature and low humidity compressed air to one hold on the upstream side of the plurality of holds. The high-temperature and low-humidity compressed air is arranged so as to be sequentially guided into the other hold on the downstream side, which is fluidly connected in series with the one hold.
The hold drying system according to claim 1 or 2. The cargo ship comprises multiple sets of holds, including at least two holds.
At least two holds included in each hold set are each provided with a through hole and are fluidly connected to each other through the through hole.
The pipe fluidly connects a plurality of hold sets in series to guide the high temperature and low humidity compressed air into at least two holds of one hold set on the upstream side of the plurality of hold sets. By Arranged so that they are guided in order in the hold,
The hold drying system according to claim 1 or 2. The dry air generator is configured to be able to generate nitrogen gas by passing the generated high-temperature and low-humidity compressed air through a gas filter for removing a gas other than nitrogen gas.
The dry air generator is configured to be able to switch between the high temperature and low humidity compressed air and the nitrogen gas and send them into the pipe.
The hold drying system according to any one of claims 1 to 4. A method for drying the inner surface of a hold in a cargo ship having a hold on which cargo is loaded.
To generate high-temperature, low-humidity compressed air with higher temperature, higher pressure, and lower relative humidity than the air in the hold.
A method including guiding the high temperature and low humidity compressed air into the hold through a pipe. Producing the high temperature and low humidity compressed air can
Compressing the air in the atmosphere to generate compressed air,
By cooling the compressed air, the amount of water in the compressed air is reduced to generate low-moisture compressed air.
By heating the low-moisture compressed air to a temperature higher than the air in the hull, the relative humidity of the low-moisture compressed air is lowered to be lower than the relative humidity of the air in the hull, and the high-temperature low-humidity compressed air is made. The method of claim 6, comprising generating. The cargo ship has multiple holds
To guide the high temperature and low humidity compressed air into the hold
To fluidly connect the plurality of holds in series with each other via the pipe,
By guiding the high-temperature and low-humidity compressed air into one hold on the upstream side of the plurality of holds, the high-temperature and low-humidity compressed air discharged from the one hold is fluidized in series with the one hold. The method of claim 6 or 7, comprising in turn leading into another hold on the connected downstream side. The cargo ship comprises multiple sets of holds, including at least two holds.
At least two holds included in each hold set are each provided with a through hole and are fluidly connected to each other through the through hole.
To guide the high temperature and low humidity compressed air into the hold
By fluidly connecting the plurality of hold sets in series with each other via the pipe,
By guiding the high temperature and low humidity compressed air into at least two holds of one hold set on the upstream side of the plurality of hold sets, the air was discharged from at least two holds of the one hold set. 6. Method. 6 to 9, further comprising guiding nitrogen gas into the hold via the pipe after drying the inner surface of the hold by carrying out the method according to any one of claims 6-9. The method according to any one of 9.

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