JP2002240778A - Bulk carrying vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect ash as fuel residue of coal by using a coal carrying vessel instead of an exclusive carrying vessel for reducing expenses and for improving operation efficiency. SOLUTION: An airtight tank 15A for storing ash is mounted on the carrying vessel having a cargo hold 5 for coal. Ash on a shore side is sucked/guided into the tank 15A for loading by a suction pipe 26 of a vacuum pump 25 connected to the tank 15A and an unloading duct 32 for receiving the ash on the shore side and ash in the tank 15A is forcibly fed and discharged to the shore side for landing by a discharging pipe 29 of a compressor 28 connected to the tank 15A and a landing duct 35 for delivering the ash to the shore side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulk carrier for transporting coal and transporting ash as a combustion residue.

[0002]

2. Description of the Related Art Amorphous solid cargoes composed of small lumps, granules and powders of ore, coal, limestone, wood chips, grains, cement and the like, that is, bulk carriers for transporting bulk materials by sea are well known.

[0003] On the other hand, in a thermal power plant or the like that burns and consumes coal, ash, which is a combustion residue, is inevitably generated, and there is a tendency that a coal consumer requests a coal supplier to take over the ash. It has become. Because coal and ash have completely different properties, unload coal and load it into an empty cargo hold, or handle ash on a bulk carrier equipped with a cargo handling device for coal. Is
Ash is mixed in the coal to be transported next, which causes quality deterioration. Therefore, it was necessary to prepare a carrier specialized in the transportation of ash separately from the transportation of coal.

[0004]

However, separately preparing a carrier for transporting coal in bulk and a carrier for transporting ash in bulk significantly increases the burden of equipment costs. Labor costs are increased due to the need for transportation, and each of them travels round-trip and is one-way transportation, so there is a lot of wasteful consumption of fuel, and it is often difficult to set a reasonable ship assignment schedule. Accompanied by

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems caused by preparing a carrier specialized in coal and a carrier specialized in ash, and transports coal on the outward route and ash on the return route. And a bulk carrier equipped with a function capable of handling ash without being mixed with coal, and capable of loading and unloading without requiring ash handling equipment at the pier. Aim.

[0006]

As a first means for solving the above-mentioned problems, the present invention provides an airtight tank for containing ash, a vacuum pump and a compressor, and a load for receiving ash from the land side. The loading pipeline and the unloading pipeline for transferring the ash to the land side were mounted on a bulk carrier having a cargo hold for holding coal in the hold.

[0007] The suction pipe of the vacuum pump, the discharge pipe of the compressor, the loading pipe and the unloading pipe are connected to the tank and open / close valves are respectively provided for the tanks. The ash was sucked in from the loading line as a pressure, and the ash was pumped out from the unloading line by using a compressor with a positive pressure at the time of unloading.

As described above, a tank for containing ash is provided separately from the cargo hold for storing coal, and a vacuum pump and a compressor are used to pneumatically transport loading from the land to the tank and discharging from the tank to the land. According to the present invention, loading and unloading at a wharf having no special cargo handling equipment for ash can be performed without fear of scattering the ash into the atmosphere, and coal cargo holds and cargo handling equipment can be used. It can be handled without the inconvenience that ash comes into contact with coal and is mixed with coal. Then, since the ash can be collected and transported using the return route at the coal transportation destination, it is not necessary to use a specialized ash carrier, thereby reducing equipment costs, labor costs, fuel costs, and simplifying the dispatch schedule. .

Next, as a second means for solving the above-mentioned problems, the present invention provides a plurality of tanks having an airtight structure, and comprises a suction pipe of a vacuum pump, a discharge pipe of a compressor, a loading pipe, and a discharge pipe. The branch is connected to each of the tanks and an on-off valve is provided at each branch.A vacuum is applied to the tank by a vacuum pump to load the ash from the loading pipeline when loading, and the compressor is used for unloading. As a result, the ash is pumped and discharged from the discharge line with the tank at positive pressure.

According to the present invention, even if the volume per tank is reduced, all of the ash can be taken out, and by reducing the volume, one tank can be quickly cooled to a predetermined negative pressure. Alternatively, it is possible to shorten the time required from the start of operation of the vacuum pump and compressor to the suction of ash and the start of pumping by reaching the positive pressure, and also to continuously load the next tank in advance as negative pressure or positive pressure. Alternatively, unloading can be performed, and the efficiency of cargo handling can be improved.

The pneumatically transportable ash according to the present invention is a dry ash containing almost no water, and the ash sucked into the tank together with air from the loading line has fluidity. Connecting the loading line to the top of the tank is preferable for storing at a high filling rate because it spreads over the entire tank and accumulates with a substantially flat surface, and the unloading pipe is used for pumping and discharging without leaving it. Preferably, the channel is connected to the bottom of the tank.

Further, the inside of the tank is partitioned into an air chamber and an ash chamber by a filter, and a suction pipe of a vacuum pump is connected to the air chamber, and a discharge pipe, a loading pipe and a discharge pipe of the compressor are provided in the ash chamber. Connection is preferable in terms of maintenance of the vacuum pump and prevention of ash scattering. Furthermore, it is preferable to connect the discharge pipe to a lower part of the tank so that the discharge pipe can be fed and discharged without clogging.

Although ash varies depending on the place of production and quality of coal, it is generated on average about 15% of coal. Therefore, the capacity is significantly smaller than that of coal, and the tank is installed above the upper deck or the upper half is protruded above the upper deck to ensure sufficient capacity of the coal cargo hold. However, it does not significantly affect navigation safety or work on the upper deck. However, installing the tank in the hold space between the engine room and the cargo hold means that there is no noticeable obstacle on the upper deck, that the load distribution in the longitudinal direction of the hull can be equalized and that stability can be improved. This is a preferred embodiment.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS.
The engine room 3 is installed near the stern of the ship, and a cargo hold 5 is provided inside the hold 4 extending nearer to the bow, leaving a space on both the stern side and the bow side. Referring to FIGS. 1, 2 and 3, the cargo hold 5 is shaped like a long hopper in the front-rear direction surrounded by front and rear partition walls 5a, left and right side walls 5b, and a bottom wall 5c which is inclined left and right and whose center is flat. The top surface forms a hatch 5d which is open above the upper deck 2 and can be opened and closed. A mountain-shaped cover body 6 is installed so as to penetrate the cargo hold 5 in the front-rear direction so as to cover the upper part of the flat portion of the bottom wall 5c.

A traveling rail is laid inside the cover body 6, and a dispensing machine 7 having a body 7a and rotating blades 7b.
Are provided so that the body 7a can be reciprocated on a traveling rail. When the fuselage 7a travels, the rotating blades 7b protruding downward from the cover body 6 move while rotating along the upper surface of the flat portion of the bottom wall 5c, so that the coal loaded in the cargo hold 5 is moved to the bottom wall. It is sequentially discharged downward from a slit-like discharge port 5e provided at the center of the flat portion 5c.

A discharge conveyor 8 is provided between the bottom wall 5c and the bottom of the ship. The discharge conveyor 8 is a belt conveyor located below the discharge port 5e and extending in the front-rear direction of the cargo hold 5. A vertical conveyor 9 composed of a belt conveyor extending upward from the upper deck 2 is provided. Further, a boom 11 is provided on the upper deck 2 near the bow so that the boom 11 can be swiveled and raised and lowered and cantilevered, and a landing conveyor 10 composed of a belt conveyor is installed on the boom 11.

The coal discharged by the dispensing machine 7 to the lower side of the cargo hold 5 is sent on the discharge conveyor 8 toward the bow,
Next, it is sent above the upper deck 2 by the vertical conveyor 9,
Further, the landing is carried out by the landing conveyor 10 at a predetermined place on the wharf. Such a dispensing machine 7 and conveyors 8, 9, 10
A cargo handling apparatus for discharging coal, which is a combination of the above, is described in Japanese Utility Model Laid-Open No. 2-33196 or the like, and is not new in itself.

Next, referring to FIGS. 1, 2 and 4,
The space between the engine room 3 of the hold 4 and the cargo hold 5
Three tanks 15 adjacent to each other in the direction_A, 15_B,
Fifteen _CHas been built. Tank 15_A, 15_B, 15
_CIs a peripheral wall 16 and a partition wall 17 and a top wall 18 inside the peripheral wall 16.
The bottom wall 19 slopes down toward the heart.
Airtight hopper shape
And the filter 20 installed near the top end
Therefore, the upper narrow air chamber 22_A, 22_B, 22 _CAnd down
Large ashtray 23_A, 23_B, 23_CIs divided into
You. Ash room 23_A, 23_B, 23_CFilter 20
Level sensor 21 that detects the height of ash accumulation at a height near the sea
Is installed.

The tank 15 of the hold 4_A, 15_B, 15_CTo
In the installed space, a vacuum pump 25 and a compressor 28 are provided.
Installed and electromagnetically driven on-off valve 27_A, 27_B, 2
7_CWith each air chamber 22_A, 22_B, 22_CConnect to
The suction branch pipe branches off from the suction pipe 26 of the vacuum pump 25.
I have. Also, the electromagnetically driven on-off valve 30_A, 30_B, 30 _C
With each ash room 23_A, 23_B, 23_CConnected near the bottom of
The discharged branch pipe is branched from the discharge pipe 29 of the compressor 28.
You.

Further, an electromagnetically driven on-off valve 33_A, 33_B,
33_CWith each ash room 23_A, 23 _B, 23_CAt a height
The connected loading branch branches off from the loading line 32 and
Electromagnetically driven on-off valve 35_A, 35_B, 35_CHave each
Ash room 23_A, 23_B, 23_CConnected to the lowest point of
A discharge branch pipe branches off from the discharge line 34. loading
The pipeline 32 and the discharge pipeline 34 are arranged in the space of the hold 4.
But their inlet and outlet ends are on the upper deck 2.
It is located towards. In addition, the discharge port of the vacuum pump 25, the pressure
The suction port of the compressor 28 also opens to the atmosphere above the upper deck 2.
You.

The tank 15 according to the present embodiment as described above
_A, 15_B, 15_CAn example of the work procedure for loading ash into
Referring to FIG. 4, the destination of coal landing
Bottom of silo 45 installed on wharf and loading pipe on carrier
The path 32 is connected by a partly flexible carry-in pipe 46.
And, the on-off valve 27 in the closed state_A..., 30
_A..., 33_A..., 35_A... within tank 1
5_AOn-off valve 27_A, 33_ATo open the vacuum pump 2
When driving 5, tank 15_AThe interior of the
The ash stored in the iro 45 is loaded into the loading pipe 46 and the loading pipeline.
Ash room 23 through 32_AIs introduced by suction. A certain amount of ash
Is introduced, the on-off valve 27_A, 33 _AWhen is closed
Both valves 27_B, 33_BWhen the valve is opened, the ash
Link 15 _BAsh room 23_BSuction is introduced into the
When the opening and closing valve 27_B, 33_BWith closing
ON / OFF valve 27_C, 33_CTo open the third tank 15
_CAsh room 23_CThe ash is introduced by suction. In this way,
All the ash from Iro 45 in tank 15_A, 15_B, 15_CTo
Can be loaded by suction.

The amount of the ash introduced by suction is measured by the level sensor 2.
1 has to be detected by the on-off valve 27 _A · · · by the detection signal and controls the opening and closing operation of 33 _A · · ·, it is also possible to control the opening and closing operations by the time. Also, while suction inlet ash into one tank _{15 A, 15 B, 15 C} , may be made to communicate with the next tank in the suction pipe 26 to start suction of air, In this way the next When the tank is communicated with the loading line 32, the ash is immediately sucked and introduced, and the ash in the silo 45 can be almost continuously loaded to perform the cargo handling operation with high efficiency.

When the carrier arrives at the ash landing site,
Top of silo 48 installed on the head and discharge line on carrier
34 is connected by a partially unloading pipe 49. So
And the on-off valve 27 in the closed state_A..., 30_A
..., 33_A..., 35 _A... within tank 15
_AOn-off valve 30_A, 35_ATo operate the compressor 28
When turned, tank 15_ABecomes positive pressure and the ashes chamber 23
_AAsh passes through the unloading line 34 and the unloading tube 49 and the silo 4
8 and discharged. On-off valve when ash has been discharged
30_A, 35_AAnd the on-off valve 30_B, 35
_BWhen the valve is opened, the next tank 15_BInside becomes positive pressure
Tash room 23_BAsh is pumped and discharged, and the on-off valve 30_B,
35_BAnd the on-off valve 30_C, 35_COpen
By doing the third tank 15_CAsh is pumped out
Is done. In this way, all tanks 15_A, 1
5_B, 15_CAsh is pumped out and discharged to landside silo 48
Can be

[0024] Incidentally, the opening and closing valve ₃₀ A · · ·, although the opening and closing operation of ₃₅ A · · · generally controlled by time, the ash was pumped discharged from one tank _{15 A, 15 B, 15 C} When the next tank is in communication with the discharge pipe 29, the pressurization may be started. In this case, when the next tank is connected to the discharge pipe 34, the ash is immediately discharged and discharged. Thus, the ash can be unloaded almost continuously, and the cargo handling operation can be performed with high efficiency. In this case, it is advantageous to install a pressure accumulator and store the compressed air in order to start unloading early and to perform continuous unloading.

The discharge pipe 29 of the compressor 28 has the structure shown in FIG.
In the embodiment, each tank 15_A, 15 _B, 15_CIn the low
Connected. In this way, the ash is
Is blown up, stirred and mixed with air to create clogging
Without passing through the unloading line 34 and the discharge tube 49,
B.

According to the embodiment shown in FIGS. 1 and 2, the operation of unloading the coal in the cargo hold by the unloading conveyor 10 is performed near the bow, and the tanks 15 _A and 15 _{A are used} .
_B, 15 so work stow ash _C is carried out at the stern across the cargo hold 5 side, these work can be performed simultaneously without interference with each other, the berthing time greatly improve the working efficiency This has the effect of shortening, and thus, improving the operating efficiency of the carrier.

The loading pipeline 32 and the unloading pipeline 34 are separately opened on the upper deck 2 to carry in and out the carry-in pipe 46 and the carry-out pipe 49, respectively.
Are connected to each other, but they may be combined into one opening. In this case, each pipe 3
An opening / closing valve is provided at each of the two or 34, or a directional control valve is provided at a merging point so that suction and introduction of ash and discharge and discharge of ash can be performed accurately without error.

The number of tanks 15 _A , 15 _B , 15 _C can be set arbitrarily, and may be only one. If only one tank is used, vacuum pump 2
5, It takes a long time from the start of the operation of the compressor 28 to the start of the suction and pumping of the ash, but by starting the operation early, the loading and unloading of the ash can be started immediately when the berth arrives at the pier,
It is possible to carry out the cargo handling work with high efficiency. In addition, there is an advantage that the branch pipes of the suction pipe 26, the discharge pipe 29, the loading pipe 32, and the unloading pipe 34 are not required, and the on-off valves thereof are only one, so that the equipment is simple.

[0029]

As described above, the tank for loading ash is provided separately from the cargo hold for loading coal, and the suction pipe of the vacuum pump, the discharge pipe of the compressor, the ash loading pipe and the unloading pipe are connected to the tank. According to the present invention, the ash on the land side is sucked and introduced into the tank by operating the compressor and the opening and closing of the on-off valve, or the ash of the tank is pumped and discharged to the land side by connecting to a vacuum pump. The ash can be collected and collected using the transported return route, so that the carrier can be used efficiently and a specialized ash carrier is not required, thereby greatly reducing various costs.
In addition, since the ash is loaded and unloaded by air transport, it can be handled and transported without worrying about scattering into the atmosphere.Additionally, it can be loaded and unloaded without the need for ash handling equipment at the pier, so it is possible to meet ash collection requirements It is possible to respond easily.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic plan view partially cut away from FIG. 1;

FIG. 3 is an enlarged sectional view of the hull in the width direction of FIG. 1;

FIG. 4 is a layout diagram showing an embodiment of a main part of the present invention.

[Explanation of symbols]

 1 hull, 2 upper deck, 3 engine room, 4 hold,
 5 Cargo hold, 15 _A, 15_B, 15_C Tank,
20 filters, 22_A, 22_B, 22_CAir chamber,
23_A, 23_B, 23_C Ash chamber, 25 vacuum pump,
 26 suction pipe, 27_A, 27_B, 27_C, 30_A,
30_B, 30_C, 33_A, 33_B, 33_C, 35_A, 3
5_B, 35_C On-off valve, 28 compressor, 29 discharge
Pipe, 32 loading pipeline, 34 unloading pipeline,

Claims (6)

[Claims] 1. A bulk carrier having a cargo hold in a cargo hold for storing coal therein, the tank having an airtight structure for storing ash, a vacuum pump and a compressor, and a load for receiving ash on land. A pipeline and an unloading pipeline for transferring ash to the land side, wherein the suction pipe of the vacuum pump, the discharge pipe of the compressor, the loading pipeline and the unloading pipeline each have an on-off valve. Connected to the tank, the tank is set to a negative pressure by the vacuum pump during loading, and ash is suction-introduced from the loading line, and the discharge tube is set to the tank at a positive pressure by the compressor during unloading. A bulk carrier for discharging ash from a road by pressure. 2. A bulk carrier having a cargo hold for holding coal in a hold thereof, comprising: a plurality of hermetically sealed tanks for containing ash; a vacuum pump and a compressor; A loading pipeline for receiving the ash and a pipeline for discharging ash to the land side, and a suction pipe of the vacuum pump, a discharge pipe of the compressor, the loading pipeline and the unloading pipeline are provided in each of the tanks. It is connected in a branched manner and has an open / close valve at each branch portion. At the time of loading, the vacuum pump sets the tank to a negative pressure to suck and introduce ash from the loading pipeline. And the ash is pressure-discharged from the unloading line by setting the tank to a positive pressure. 3. The bulk carrier according to claim 1, wherein the loading line is connected to a top of the tank, and the discharge line is connected to a bottom of the tank. 4. The interior of the tank is divided into an air chamber and an ash chamber by a filter, a suction pipe of the vacuum pump is connected to the air chamber, and a discharge pipe of the compressor is connected to the ash chamber. The bulk carrier according to claim 1, 2, or 3, wherein the loading pipeline and the unloading pipeline are connected. 5. The bulk carrier according to claim 1, wherein the discharge pipe of the compressor is connected to a lower part of the tank. 6. The bulk carrier according to claim 1, wherein the tank is installed in a hold space between an engine room and the cargo hold.