JPS6157481A - Coal slurry carrier - Google Patents

Abstract

PURPOSE:To aim at efficiency improvements in cargo slurry unloading, simplification in a hull structure and streamlining of pipe arrangements, by forming a hopperlike incline, having a step difference, in the bottom of a cargo tank, while connecting a suction pipe for an unloading pipe line to this step difference. CONSTITUTION:The bottom of a cargo tank 1 is formed into a hopper form by a pair of bottom plates 20. a step difference is formed in the central part of each bottom plate 20, installing a vertical surface 21, and they are joined together. And, a suction pipe 3 for an unloading pipe line provided with a valve 13 is connected to this vertical surface 21 of the step difference part, and coupled with a discharge pipe 4 for the unloading pipe line via a cargo pump 2. With this constitution, when the valve 13 is opened and the cargo pump 2 is driven, coal slurry inside the cargo tank 1 is delivered through the suction pipe 3 and the discharge pipe 4. At this time, the coal slurry is drawn in by suction without staying on the bottom plate 20, thus efficient unloading is performable.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a high-concentration coal slurry transport vessel (older brother CARR).
jER).

[Prior art]

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

In March 1981, the 191st Research Subcommittee Report (SB.

191) has been done. Figures 4 and 5 are explanatory diagrams in this report, where Figure 4 is a system diagram showing the main cargo line Y, and Figure 5 is a sectional view of the bottom of the cargo tank. This report describes devices such as stirring tanks, stirrers, and stirring rods as a countermeasure against precipitation and coagulation, which is a serious issue for coal slurry.

First, in FIG. 4, 1 is a cargo tank, 2 is a cargo pump 4 disposed under each cargo tank 1, and a discharge pipe is connected to each cargo pump 2. 5 is a discharge pipe 4 of these.
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, onshore construction) To load coal slurry onto a ship, the coal slurry is pumped through an unloading connection pipe 6'kaj0 connected to a cargo handling line on land and a cargo handling pump on land. The pressure-fed coal slurry passes through a 5-ft collecting pipe, passes through each loading pipe 71, and then flows into each cargo tank 1 and is loaded therein. 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 the coal slurry from one 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, and then Through, unloading connection pipe 61L-
After that, it is sent to the cargo handling line on land.

In this case, it is necessary to carry out an odor stirring operation 5 to loosen the precipitated and solidified coal slug IJ 5. FIG. 5 shows such an agitation device, in which an agitation tank 16 is provided below the cargo tank 1 near the center of the ship, an agitator 17 is attached to its side wall, and a suction pipe 3 is attached to the bottom of the agitation tank 16. It is connected to cargo pump 2. Further, the bottom of the cargo tank 1 is provided with a groove 18 which is provided with an internal stirring rod (smaller) 19 and connected to the upper part of the stirring tank 16.

The operation of the stirring device constructed in this way will be explained in detail. 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 flows into the stirring tank 16. Stirring tank 16
The inside of the tank is similarly stirred by the stirrer driven by a rotation of 1°7, and the coal grains inside float and flow in the water. The coal slurry in such a fluidized state is sucked into the cargo pump 2 through the suction pipe 3, and then pushed out into the discharge pipe 4 and sent out to land according to the system diagram shown in FIG. 4.

The above-mentioned publication reports a stirring device as a countermeasure against precipitation and coagulation of coal slurry. However, this device has a complicated structure (it is necessary to provide a groove for a stirring tank and a stirring rod at the bottom of the 11 cargo tanks).

(2) The structural weight of the hull increases.

(3) The volume of the cargo tank decreases.

(41 The installation of the stirrer and stirring rod requires a lot of machined parts, which also requires watertight construction and is difficult to work with.

(51 Piping is not easy.

The above-mentioned flaws were pointed out and needed to be improved.

[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 the slurry cargo, simplify the hull structure, and provide a coal slurry ship with easy piping. do.

[Summary of the invention]

The present invention has been made to achieve the above-mentioned object, and a hopper-like slope with a step is formed at the bottom of a curved tank, and a suction pipe of an unloading pipeline is connected to the step, thereby improving unloading efficiency. The present invention provides a coal slurry ship characterized by improved performance and simplified hull structure.

[Fruit of invention 71! Example i] The present invention will be explained with reference to drawings. Figure 1 is a sectional view of the center of the ship, and is an enlarged view of the X-Y section of the vertical sectional view of Figure 3. A part of ■ is enlarged and shown in Fig. 2 (AJ, Fig. 2 (B)). Formed L!-&li/,-19
;tsun M M xh M lr b t s FD
讼yy/) 21 ft of vertical surface is provided and joined, and the suction pipe 3a of the unloading pipeline equipped with pulp 13 is connected to the vertical surface 21 of this stepped part, and the unloading pipeline is connected via the cargo pump 2. It is connected to the discharge pipe 4.

Next, this effect will be explained. 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. In this state, if the pulp 13 is opened and the cargo pump 2 is driven, 1 coal slurry is sucked through the suction pipe 3 to the 9 cargo pump 2, and is sent out through the discharge pipe 4.
Since the coal slurry is moved along the slope where it flows easily, and a powerful cargo pump 2 is close to the lowest point and performs suction drive, the coal slurry accumulates on the bottom plate 20. This allows for efficient unloading.

〔Effect of the invention〕

According to the cargo tank according to the present invention, (1) the hull structure can be simplified and construction costs can be reduced;
2) The center of the cargo tank bottom plate has been lowered, increasing the tank capacity.

(3) Simplification of structure =) Reduction of ship weight (4)
) Unloading efficiency improves as the remaining amount of cargo decreases.

(5) The circulation system can be used for tank cleaning and to prevent coal slurry from settling and coagulating.

(6) Piping is easy.

This has the above effects.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the center of the hull, Figure 2 (Al, (Bl is M1
FIG. 3 is a longitudinal sectional view of the hull, FIG. 4 is a system diagram of the main cargo line, and FIG. 5 is a sectional view of the bottom of a conventional cargo tank. 1: Cargo tank% 2: Cargo pump, 3: Suction pipe,
4: discharge pipe, 13: pulp, 20: bottom plate. 21: Vertical surface.

Claims (1)

[Claims] A coal slurry ship in which the bottom of a cargo tank is formed into a hopper shape, a pair of bottom plates are joined at the center with a step, and an unloading pipeline is connected to the step.