JP2005001630A - Device for collecting residual cargo oil in cargo tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for collecting residual cargo oil in a cargo tank capable of safely and efficiently collecting cargo oil such as crude oil stored in the cargo tank provided in a hold of a ship such as a tanker by a simple equipment, simplifying the structure and the pipe installation, and reducing the equipment cost, the working cost and the manufacturing cost. <P>SOLUTION: A residual cargo oil collection tank 3 is provided on a lower side of a deck 2 in a cargo tank 1 with cargo oil W transferred inside thereof. An ejector 7 provided on an outer upper part of the residual cargo oil collection tank or on the deck 2 via a valve element 9 for the ejector and a valve element 10 for pressurization are connected in parallel to the residual cargo oil collection tank. When the residual cargo oil is collected, the valve element for pressurization is closed, and the valve element for the ejector is opened to evacuate the residual cargo oil collection tank, and residual cargo oil stored in a well 4 provided in a lower bottom part of the cargo tank is sucked and collected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cargo tank residual liquid recovery device, for example, a chemical liquid, a chemical liquid, etc. stored in a cargo tank provided in a hold of a ship such as a tanker can be safely and efficiently discharged with simple equipment. It is to be recovered and is optimally used especially in explosion-proof areas.
[0002]
[Prior art]
Conventionally, for example, a method for recovering cargo liquid such as a chemical liquid, a chemical liquid, a crude oil, or a mixture such as a slurry of finely divided coal and water stored in a cargo tank provided in a hold of a ship such as a tanker, Recovery was performed by driving a cargo pump installed on the deck or in the cargo tank (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-7072 (see [0005], [0016], FIGS. 1 and 4).
[0004]
[Problems to be solved by the invention]
However, since the above conventional load recovery method described in Patent Document 1 is performed by driving a load pump installed on a deck or in a cargo tank, the load is recovered from the cargo tank. However, the cargo liquid remained at the bottom of the cargo tank, and it was structurally difficult to make the residual liquid zero. In order to collect the residual liquid as much as possible, it was necessary to install a residual liquid pump in addition to the cargo liquid pump.
[0005]
However, even when a residual liquid pump is used, it is difficult to make the residual liquid zero.
And in the ship which does not install the residual liquid pump, the crew member enters the cargo tank, and the actual situation is that the residual liquid is collected into the container manually using a recovery tool. For this reason, recovery requires a lot of labor and time, is inefficient, and a safe and efficient residual liquid recovery method is desired.
[0006]
In addition, the above conventional method for recovering cargo liquid described in Patent Document 1 has a problem that, when there are many types of cargo liquids, in order to prevent mutual mixing of cargo liquids, the remaining cargo liquid is stored for each cargo tank that accommodates individual cargo liquids. Since a liquid pump is required and piping is complicated, the equipment cost, the construction cost, and the production cost are expensive.
[0007]
The present invention solves the above-mentioned conventional inconveniences, allows the residual liquid in the cargo tank to be collected safely and efficiently, close to zero, and simplifies the construction of the structure and piping. Is intended to be provided at low cost.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a cargo tank provided on the lower surface of the deck, in which cargo liquid is transferred to the inside, a residual liquid recovery tank provided in the cargo tank, and a residual liquid recovery tank. The ejector provided on the outer upper part or on the deck via the ejector valve body is connected in parallel with the pressurizing valve body, and when the liquid is recovered, the pressurizing valve body is closed and the ejector valve body is opened. Then, the inside of the residual liquid recovery tank is decompressed, and the load liquid collected in the well provided in the lower bottom portion of the cargo tank is sucked and recovered.
[0009]
Further, according to the second aspect of the present invention, in the first aspect, after collecting the load liquid in the residual liquid recovery tank, the ejector valve body is closed and the pressurizing valve body is opened to recover the residual liquid. Adopted means that pumps the liquid recovered by pressurizing the inside of the tank to the outside of the cargo tank through a discharge pipe having one end connected to the lower part of the outer periphery of the residual liquid recovery tank. .
[0010]
According to a third aspect of the present invention, in the first or second aspect, the one end side of the discharge side pipe is connected to the suction port that reaches the well via the pneumatic valve body and the remaining portion. Branched to a discharge port connected in the liquid recovery tank, and the other end of the discharge side pipe is connected to a cargo handling pipe piped on the deck via a discharge valve body Adopted.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a case where a specific example of an embodiment of the present invention is applied to a tanker will be described with reference to the drawings.
FIG. 1 is a piping diagram showing an embodiment of a cargo tank residual liquid recovery apparatus according to the present invention.
[0012]
Reference numeral 1 denotes a cargo tank provided on the lower surface of the deck 2 and into which the cargo liquid W is transferred. A residual liquid recovery tank 3 is provided in the cargo tank 1. A lower well 4 is formed immediately below the residual liquid recovery tank 3.
The residual liquid recovery tank 3 is a hermetically sealed container, the shape of the residual liquid recovery tank 3 is a representative example, and the size thereof is freely selected according to the capacity of the cargo tank 1.
[0013]
Reference numeral 5 denotes a cargo handling pipe which is piped on the deck 2 in order to transfer the cargo liquid W to the cargo tank 1 and accommodate it, and a cargo handling pump P is connected to the cargo handling pipe 5 via a cargo handling valve 6. One end portion 5 a is piped in the cargo tank 1.
[0014]
Reference numeral 7 denotes an ejector, and the ejector 7 is connected to an upper portion outside the residual liquid recovery tank 3 via an ejector valve body 9 installed in an ejector pipe 8.
[0015]
Reference numeral 10 denotes a pressurizing valve body, and the pressurizing valve body 10 is connected in parallel to the ejector 7 through the pressurizing pipe 11 at the outer upper portion of the residual liquid recovery tank 3.
The upstream side of the ejector valve body 9 and the pressurizing valve body 10 are connected to an air supply pipe I. From the air supply pipe I, for example, nitrogen gas, neon gas, argon gas or the like is inactive considering the explosion-proof property of the cargo tank 1. A pressurized gas G made of gas is supplied.
[0016]
Reference numeral 12 denotes a first communication pipe that communicates the ejector pipe 8 and the pressurization pipe 11. The communication pipe 12 is provided with a pneumatically operated valve body 13 that extends to the outer upper portion of the residual liquid recovery tank 3. Has been introduced. This pneumatically operated valve body 13 opens and closes the valve by using pressure such as air. In this embodiment, the pneumatically operated valve body 13 is closed when the air pressure is applied, and is opened when the air pressure is released. It has become. The pneumatic operation valve element 13 prevents the pressure from escaping from the ejector 7 in the pressurizing step in which the cargo liquid W is pumped after the cargo liquid W is collected in the residual liquid collection tank 3, and the residual liquid. The inside of the collection tank 3 is sealed.
A second communication pipe 14 communicates the ejector pipe 8 and the pressurization pipe 11.
[0017]
When the cargo liquid W is recovered, the pressurizing valve body 10 is closed and the ejector valve body 9 is opened to depressurize the residual liquid recovery tank 3 so that the cargo liquid W is provided at the lower bottom portion of the cargo tank 1. The loaded liquid W collected in the well 4 is collected until it reaches substantially zero.
[0018]
Reference numeral 15 denotes a discharge pipe having one end connected to the lower part of the outer periphery of the residual liquid recovery tank 3, and the discharge pipe 15 has a suction port whose one end reaches the well 4 via the pneumatic valve body 16. 15a and a discharge port 15b connected to the lower part of the outer periphery of the residual liquid recovery tank 3 and the other end 15c of the discharge side pipe 15 is placed on the deck 2 via a discharge valve body 17 and a check valve 18. The cargo handling pipe 5 to be piped is connected. Reference numeral 19 denotes a drain valve led out below the residual liquid recovery tank 3.
[0019]
The pneumatic operation valve body 16 has the same structure as the pneumatic operation valve body 13, and this pneumatic operation valve body 16 is a suction port that reaches the well 4 when the residual liquid recovery tank 3 is pressurized. This is to prevent the pressure from escaping from 15a.
[0020]
Further, these pneumatically operated valve bodies 13 and 16 are normally opened, and when the cargo liquid W is loaded in the cargo tank 1, the residual liquid recovery tank 3 is also filled with the cargo liquid W. .
In addition, the liquid level in the residual liquid recovery tank 3 also decreases in response to a decrease in the level of the cargo liquid W in the cargo tank 1 due to pumping, and the residual liquid recovery tank 3 becomes empty at the end of handling. . This is because if the residual liquid recovery tank 3 is empty when the cargo liquid W is loaded in the cargo tank 1, an external pressure is applied to the residual liquid recovery tank 3 and buoyancy is generated, resulting in inability to navigate the ship. In order to be stable, these harmful effects are prevented.
[0021]
The discharge pipe 15 adds the residual liquid collection tank 3 by closing the ejector valve body 9 and opening the pressurizing valve body 10 after collecting the load W in the residual liquid collection tank 3. The cargo liquid W recovered by the pressure is pumped out of the cargo tank 1 to perform cargo handling.
[0022]
One embodiment of the present invention has the above-described configuration, and in order to accommodate cargo liquid W such as a chemical liquid or a chemical liquid in a cargo tank 1 provided in a hold of a ship such as a tanker, the cargo handling valve 6 is opened and the cargo handling pump P , The cargo liquid W is transferred and stored in the cargo tank 1 through the cargo handling pipe 5. Then, after loading the cargo liquid W in the cargo tank 1, the cargo handling pump P is closed.
[0023]
At this time, when the cargo liquid W is loaded in the cargo tank 1, the residual liquid recovery tank 3 is also filled with the cargo liquid W. Further, the liquid level in the residual liquid recovery tank 3 also decreases in response to the drop in the level of the cargo liquid W in the cargo tank 1 due to pumping, and the residual liquid recovery tank 3 is emptied at the end of cargo handling. Become. The ejector pipe 8 and the pressurization pipe 11 communicate with each other, a pneumatic operation valve body 13 provided in a first communication pipe 12 introduced into the upper part outside the residual liquid recovery tank 3, and a residual liquid recovery The pneumatically operated valve body 16 provided in the discharge pipe 15 having one end connected to the lower part of the outer periphery of the tank 3 is normally opened. This is because, when the cargo liquid W is loaded on the cargo tank 1, if the residual liquid recovery tank 3 is empty, external pressure is applied to the residual liquid recovery tank 3, buoyancy occurs, and the hull becomes unstable. Since this hinders navigation, there is a problem that the load W is emptied by storing the load W in the residual liquid recovery tank 3 according to the load amount of the load W stored in the cargo tank 1. This is to prevent it.
[0024]
When the tanker arrives at the destination and performs cargo handling, the cargo handling valve 6 is opened and the cargo handling pump P is driven, the cargo liquid W is pumped from the cargo tank 1, and the cargo handling pipe 5 piped on the deck 2 is used for cargo handling. I do.
[0025]
Then, even when the cargo handling approaches the final stage and becomes a small amount, several tens of liters of the cargo liquid W remains in the lower bottom portion of the cargo tank 1.
[0026]
When the ejector valve body 9 provided on the deck 2 is opened and the compressed pressurized gas G such as nitrogen gas is ejected from the ejector 7 through the ejector pipe 8 from the air supply pipe 11, the residual liquid recovery tank 3 Since the residual liquid recovery tank 3 is depressurized and vacuumed by being sucked into the ejector 7 through the piping connected to the upper part of the outer periphery of the residual liquid recovery tank 3 and the pneumatic operation valve body 13. The load W stored in the lower well 4 provided at the lower bottom of the tank 1 is sucked from the suction port 15a and collected in the residual liquid collection tank 3 through the discharge port 15b. As a result, the cargo liquid W accumulated in the well 4 is transported by using a remaining service pump in addition to installing a cargo handling pump as in the prior art, or when the remaining service pump is not used, There is no need for manual collection work after entering the remaining collection tank 3, and it is efficiently and safely collected in the remaining liquid collection tank 3 in a state of almost zero.
[0027]
After the cargo liquid W is recovered in the residual liquid recovery tank 3 in this way, the ejector valve body 9 is closed and the pressurization valve body 10 is opened, thereby compressing the pressurized gas such as nitrogen gas. G is in the residual liquid recovery tank 3 through the second communication pipe 14 provided in parallel with the first communication pipe 12 provided with the pressurizing pipe 11 and the closed pneumatic operation valve body 13. The residual liquid collection tank 3 is pressurized by being pumped.
[0028]
Then, by opening the discharge valve body 17 provided on the deck 2, the cargo liquid W recovered in the residual liquid recovery tank 3 is pressurized by the pressurized gas G, and discharged from the discharge port 15b to the discharge pipe 15, It is pumped to the cargo handling pipe 5 through the discharge valve body 17 and the check valve 18. Thus, the residual liquid of the cargo liquid W recovered in the residual liquid recovery tank 3 is pumped to the cargo handling pipe 5 and is pumped to the land together with the residual liquid in the cargo handling pipe 5 generated by the cargo handling.
[0029]
Further, since the drain valve 19 is provided at the lower part of the residual liquid recovery tank 3, the residual liquid recovery tank 3 is opened by opening the drain valve 19 after the cargo liquid W in the cargo tank 1 is emptied. After the interior is emptied, the inside of the residual liquid recovery tank 3 is cleaned.
At this time, by providing an inlet / outlet (not shown) at the bottom of the residual liquid recovery tank 3, a crew member may easily enter and exit the residual liquid recovery tank 3 during cleaning work.
[0030]
In the embodiment shown in the figure, the case where the ejector 7 is provided on the outer upper side with respect to the residual liquid recovery tank 3 in the cargo tank 1 is representatively described. However, in the present invention, the installation position of the ejector 7 is described above. Without limitation, for example, by providing the ejector 7 on the deck 2, when the load W is collected, the pressurizing valve body 10 is closed and the ejector valve body 9 is opened to open the well 4 provided in the lower bottom portion of the cargo tank 1. It is also within the scope of the present invention to collect the accumulated liquid W.
[0031]
Further, in the above description, the case where cargo handling is performed on a tanker is representatively described, and the case where chemical liquid and chemical liquid are collected and transferred as residual liquid is representatively described as cargo liquid W. Without limitation, it may be a fluid mixture such as a slurry of crude oil or fine coal and water.
[0032]
【The invention's effect】
According to the first aspect of the present invention, there is provided a cargo tank provided on the lower surface of the deck, in which cargo liquid is transferred to the inside, a residual liquid recovery tank provided in the cargo tank, and a residual liquid recovery tank. The ejector provided on the outer upper part or on the deck via the ejector valve body is connected in parallel with the pressurizing valve body, and when the liquid is recovered, the pressurizing valve body is closed and the ejector valve body is opened. The residual liquid recovery tank is depressurized and the cargo liquid collected in the well provided at the bottom of the cargo tank is sucked and recovered, so the residual liquid in the cargo tank can be safely and efficiently Moreover, the recovery can be performed close to zero, and the construction cost, construction cost, and production cost are reduced by simplifying the structure and laying of the piping.
[0033]
Further, according to the second aspect of the present invention, in the first aspect, after collecting the load liquid in the residual liquid recovery tank, the ejector valve body is closed and the pressurizing valve body is opened to recover the residual liquid. The cargo liquid recovered by pressurizing the inside of the tank is pumped out of the cargo tank through a discharge pipe connected at one end to the lower outer periphery of the residual liquid recovery tank. The remaining liquid is recovered in the residual liquid recovery tank and then pressurized and pressurized by the pressurized gas fed into the cargo tank by a simple handling operation of opening and closing the pressurizing valve body, thereby efficiently handling the cargo. .
[0034]
According to a third aspect of the present invention, in the first or second aspect, the one end side of the discharge side pipe is connected to the suction port that reaches the well via the pneumatic valve body and the remaining portion. The ejector is branched to a discharge port connected to the inside of the liquid recovery tank, and the other end of the discharge side pipe is connected to a cargo handling pipe piped on the deck via a discharge valve body. By simple handling of opening and closing valve bodies such as a valve body, a pressure valve body, and a discharge valve body, suction to the residual liquid recovery tank by the ejector and cargo handling by pressurization can be performed.
[Brief description of the drawings]
FIG. 1 is a piping diagram showing an embodiment of a cargo tank residual liquid recovery apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cargo tank 2 Deck 3 Residual liquid collection | recovery tank 4 Well 5 Cargo handling pipe 6 Cargo handling valve 7 Ejector 8 Ejector piping 9 Ejector valve body 10 Pressurization valve body 11 Pressurization piping 12 Communication pipe 13 Air operation valve body 14 Communication pipe 15 Discharge piping 16 Pneumatically operated valve body G Pressurized gas I Supply pipe P Load handling pump W Load fluid

Claims (3)

A cargo tank provided on the lower surface of the deck, in which cargo liquid is transferred to the inside, a residual liquid recovery tank provided in the cargo tank, and a valve body for an ejector on the outside upper part or on the deck in the residual liquid recovery tank An ejector provided via a pressure valve and a pressurizing valve body are connected in parallel. When recovering the load, the pressurizing valve body is closed and the ejector valve body is opened to depressurize the inside of the residual liquid recovery tank. A cargo tank residual liquid recovery device for sucking and recovering cargo liquid collected in a well provided in a lower bottom portion of a tank. After collecting the cargo liquid in the residual liquid recovery tank, the ejector valve body is closed and the pressurizing valve body is opened to pressurize the residual liquid recovery tank, and the recovered liquid is collected in the residual liquid recovery tank. 2. The cargo tank residual liquid recovery apparatus according to claim 1, wherein the liquid is pumped out of the cargo tank through a discharge pipe having one end connected to the lower part of the outer periphery. One end side of the discharge side pipe is branched into a suction port that reaches the well via a pneumatically operated valve body and a discharge port connected to the residual liquid recovery tank, and the other end of the discharge side pipe is 3. The cargo tank residual liquid recovery device according to claim 1, wherein the cargo tank residual liquid recovery device is connected to a cargo handling pipe piped on a deck via a discharge valve body.

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