JPH0355358B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a highly concentrated coal slurry carrier (CWM.CARRIER).

[Prior art]

A ship exclusively for carrying high-concentration coal slurry is currently in the stage of joint trial design with shipbuilding companies and has not yet been proven.

In the form of a research report, the 191st Research Subcommittee Report (SR191) of the Japan Shipbuilding Research Association was published in March 1981. FIGS. 4 and 5 are explanatory diagrams in this report, with FIG. 4 being a system diagram showing the main cargo line, and FIG. 5 being a sectional view of the bottom of the cargo tank. This report describes devices such as stirring tanks, stirrers, and stirring rods as countermeasures against precipitation and coagulation, which is a serious issue for coal slurries.

First, in FIG. 4, 1 is a cargo tank, 2 is a cargo pump disposed under each cargo tank 1, 4 is a discharge pipe connected to each cargo pump 2, and 5 is a discharge pipe of these. A collecting pipe connecting 4,
6 is an unloading connection pipe that connects the collecting pipe 5 and the cargo handling line on land, and 7 is a loading pipe for pouring coal slurry into each cargo tank 1.

Next, this effect will be explained. First, in order to load coal slurry onto a ship from land, the coal slurry is pumped by a land-based cargo handling pump through a loading connection pipe 6 connected to a land-based cargo handling line. The pressure-fed coal slurry passes through the collecting pipe 5, passes through each loading pipe 7, and flows into each cargo tank 1, where it is loaded. Although not shown in FIG. 4, loading onto each cargo tank 1 is freely controlled by opening and closing valves provided on the respective loading pipes 7.

Next, when unloading coal slurry from the ship, open the valves at the bottom of each cargo tank, drive the cargo pump 2 to suck out the coal slurry from the bottom of the cargo tank, pass through the discharge pipe 4 and collecting pipe 5, and unload the slurry. It is sent out to the land cargo handling line via the connecting pipe 6.

In this case, it is necessary to perform a stirring operation to loosen the precipitated and solidified coal slurry. FIG. 5 shows such a stirring device, in which a stirring tank 16 is provided below the cargo tank 1 near the center of the hull, and a stirrer 17 is attached to the side wall of the tank 16.
The bottom part is connected to the cargo pump 2 by a suction pipe 3. In addition, a stirring rod (stirrer) 19 is provided inside the bottom of the cargo tank 1, and the stirring tank 1
6 is provided with a connecting groove 18.

The operation of the stirring device configured in this way will be explained. First, the coal slurry that has settled and solidified at the bottom of the cargo tank 1 is uncoagulated by the rotation of the stirring rod 19, and gradually moves to the stirring tank 16.
flow to. The inside of the stirring tank 16 is similarly stirred by the rotational drive of the stirrer 17, and the coal grains therein float and flow in the water. The coal slurry in such a fluid state is sucked into the cargo pump 2 through the suction pipe 3, then pushed out into the discharge pipe 4, and sent out onto land according to the system diagram shown in FIG. 4.

The above-mentioned publication reports a stirring device as a countermeasure against precipitation and solidification of such coal slurry. However, this device requires (1) a groove for a stirring tank and a stirring rod to be provided at the bottom of the cargo tank, resulting in a complicated structure;

(2) The structural weight of the ship increases.

(3) The volume of the cargo tank is reduced.

(4) The installation of the stirrer and stirring rod requires many machined parts, and requires watertight construction, which is difficult to construct.

(5) Piping is not easy.

The above-mentioned shortcomings were pointed out and there was a need for improvement.

[Purpose of the invention]

The present invention was made in order to improve the above-mentioned problems, and aims to improve the efficiency of unloading slurry cargo, simplify the hull structure, and provide a coal slurry ship with easy piping.

[Summary of the invention]

The present invention has been made to achieve the above-mentioned object, and the bottom of the cargo tank is formed into a hopper shape.
A step is provided in the center thereof with an inclined surface on one side and a vertical surface on the other side, and the suction pipe of the unloading pipeline is connected to the vertical surface. As a result, the tank capacity increases, making it possible to improve unloading efficiency and simplify the hull structure.

[Embodiments of the invention]

The present invention will be explained with reference to the drawings. FIG. 1 is a cross-sectional view of the center of the hull, which is an enlarged view of the - section of the vertical cross-sectional view of the hull of FIG. 3. Furthermore, a part of FIG. 1 is enlarged and shown in FIGS. 2A and 2B. In these figures, 1 is a cargo tank, the bottom of which is formed into a hopper shape by a pair of bottom plates 20. A step is formed in the center with an inclined surface on one side and a vertical surface on the other side. A suction pipe 3 of the unloading pipeline equipped with a valve 13 is connected to the vertical surface 21 of this stepped portion, and is connected to a discharge pipe 4 of the unloading pipeline via the cargo pump 2.

Next, this effect will be explained. The bottom of the cargo tank is shaped like a hopper, and has a step in the center with an inclined surface on one side and a vertical surface on the other side. The capacity of the tank is larger only in the shaded area. The coal slurry loaded into the cargo tank 1 accumulates along the inclined surface of the hopper-shaped bottom plate 20 shown in FIG. 1, in contact with the vertical surface 21 at the lowest point of the thick slurry. If the valve 13 is opened in this state and the cargo pump 2 is driven, the coal slurry will be transferred to the suction pipe 3.
The coal slurry is sucked into the cargo pump 2 and sent out through the discharge pipe 4. At this time, the coal slurry is moved along the sloped surface of the bottom plate 20 where it flows easily, and a powerful cargo pump 2 is placed at the lowest point. Since the coal slurry is sucked in close proximity to the bottom plate 20, the coal slurry is sucked without being accumulated on the bottom plate 20, and unloading can be carried out efficiently.

[Effect of the invention] The following effects were obtained by the present invention.

(1) The bottom of the tank is shaped like a hopper, and there is a step in the center with an inclined surface on one side and a vertical surface on the other. Compared to the bottom of the tank, the bottom is lowered by the slope indicated by diagonal lines, and the capacity of the tank increases by that amount, increasing the storage capacity of the tank.

(2) Since the suction pipe of the pump is connected to the vertical surface of the step and the slurry is sucked from there, there is no need to provide a stirring tank, a stirring rod, or a groove for the stirring rod at the bottom of the tank. As a result, the hull structure is simplified, the collective weight is reduced,
Therefore, the construction cost can be reduced accordingly.

(3) Since slurry stirrers and stirring rods are not required, the number of machined parts is reduced and watertight construction is not required, making the work easier.

(4) Piping work inside a narrow tank is reduced, making the overall piping work easier.

(5) As the remaining amount of coal slurry in the cargo decreases,
Unloading efficiency is improved.

(6) In order to clean the tank and prevent the coal slurry from settling and solidifying, it will be possible to keep the coal slurry in a fluid state using a circulation system.

[Brief explanation of drawings]

Figure 1 is a sectional view of the center of the hull, Figure 2 A and B are the first
Figure 3 is a longitudinal sectional view of the hull, Figure 4 is a system diagram of the main cargo line, Figure 5 is a sectional view of the bottom of a conventional cargo tank, and Figures 6 A and B are cargo lines showing the effect. FIG. 3 is a sectional view of the bottom of the tank. 1: cargo tank, 2: cargo pump, 3: suction pipe, 4: discharge pipe, 13: valve, 20: bottom plate, 21: vertical surface.

Claims (1)

[Claims] 1 Coal slurry made by forming the bottom of a cargo tank in the shape of a hopper, forming a step in the center with an inclined surface on one side and a vertical surface on the other, and connecting the suction pipe of the unloading pipeline to the vertical surface. ship.