JPS633358Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a slurry carrier for coal and other particulate materials.

Generally, coal is transported by land from a coal producing area to a shipping port, and then transported by sea from the port by ship. Recently, in order to lower the transportation cost of land transportation and to streamline loading operations at ports,
Increasingly, powdered coal is dispersed in water at coal producing areas to form coal slurry, which is then transported through land piping to a shipping port and then loaded onto a carrier ship in the form of slurry. In this case, the slurry carrier has a plurality of holds, a slurry loading pipe with a branch pipe with a stop valve for each hold, a slurry water drain pipe for discharging the slurry water dehydrated in the hold during slurry loading, and A slurry unloading pipe is installed that also serves to transport water back to land, and at the loading port, a floating hose for slurry loading and a slurry water return pipe are attached to a buoy moored at a single point offshore and connected to onshore facilities via submarine piping. A floating hose will be provided for use. Then, with the floating hose for slurry loading connected to the loading pipe of the ship and the floating hose for returning slurry water connected to the unloading pipe of the ship, a pump installed at the onshore facility connects the submarine piping to the floating hose for slurry loading. Coal slurry is then sequentially loaded into multiple holds through loading pipes. When coal slurry is loaded into the hold, the coal particles settle to the bottom and some of the slurry water comes out on top of the coal particles, but this slurry water (overflow water)
The overflow water is discharged outside the hold through a filtered overflow water outlet installed in the wall of the hold, and is sent to onshore facilities via a slurry water drain pipe, unloading pipe, floating hose for returning slurry, and submarine piping using a pump installed on the ship. Sent back. According to such a method, coal slurry can be automatically loaded without the ship being directly attached to the quay, which is very advantageous. However, in this case, coal slurry remains in the ship's loading pipe when loading is completed, and if this is left unattended, coal particles will settle over time, making it impossible to discharge in some cases. Therefore, it is necessary to immediately discharge the residual slurry in the loading pipe after loading. As a method of discharging the residual slurry in the loading pipe, after all cargo holds have been loaded, a floating hose is connected to the ship and the slurry water that is being sent back to the onshore facility is pumped into the submarine pipe using the onshore facility's pump. It is conceivable to supply a large amount of slurry through a floating hose for loading slurry and a loading pipe, and use this water to discharge the residual slurry in the loading pipe into the hold. In order to improve the operational efficiency of a slurry carrier, it is desirable to disconnect the floating hose immediately after loading and set sail. This is not preferable because the vessel cannot sail until the floating hose is disconnected, which increases cargo handling time, that is, mooring time. It is also possible to discharge residual slurry in the same manner as above from the branch pipe of the loading pipe for each hold, but in this case, each time loading is completed for each hold, the slurry water is pumped into the shore facility. It requires a supply request and, like the above method, has the disadvantage of increasing the lay-up time before the floating hose can be disconnected from the ship.

This idea was made in view of the above-mentioned circumstances, and was designed to create a rational slurry carrier that can discharge residual slurry in the slurry loading pipe with the floating hose disconnected from the ship after loading the slurry. The purpose is to provide.

The slurry carrier according to this invention has a plurality of holds, a slurry loading pipe having a branch pipe with a stop valve for each ship layer, a slurry water drainage pipe for discharging slurry water dehydrated in the hold during slurry loading, and In a slurry transport ship equipped with a slurry unloading pipe that also serves to return slurry water to land, a slurry water tank is provided between the slurry water drain pipe and the unloading pipe, and the slurry water drain pipe is connected to the slurry water tank via a drainage pump. At the same time, the unloading pipe is connected to the outlet of the slurry water tank via the slurry water return unloading pump, and the downstream part of the unloading pipe from the slurry water return unloading pump and the beginning of the loading pipe The upstream portion of the branch pipe is connected to the branch pipe by a connecting pipe with a stop valve.

In this slurry carrier, by connecting floating hoses to the loading and unloading pipes with the connecting pipe's stop valve closed, slurry is loaded into the ship's hold while overflow water is sent back to land as in the past. be able to.
After loading the slurry, disconnect the floating hose from the loading pipe and unloading pipe, close the ends of these pipes, and drain the slurry water through the slurry water drain pipe with the stop valve of the connecting pipe open. By circulating the slurry water stored in the tank through the unloading pipe, the connecting pipe, and the loading pipe, the residual slurry in the loading pipe can be discharged into the hold.

According to this invention, as described above, the residual slurry in the slurry loading pipe can be discharged while the floating hose is disconnected from the ship after the slurry is loaded onto the ship. Therefore, it is possible to disconnect the floating hose and set sail immediately after loading the ship, reducing cargo handling time, that is, mooring time, and improving the operational efficiency of the ship. Furthermore, it is economical because the slurry water dehydrated from the slurry can be circulated and used.

Embodiments of this invention will be described below with reference to the drawings.

The drawing shows a coal slurry carrier, which is equipped with a plurality of holds 2 and a pump room 3 at the front and rear, which are partitioned by a transverse bulkhead 1 having a double structure. The hold 2 has a double side structure and a double bottom structure, and the left and right walls of the hold are configured by inner plates 4. Although not shown, overflow water outlets with filters are provided on the front and rear walls of the hold 2, and a slurry water reservoir communicating with the overflow water outlet is provided at the inner bottom of the double structure portion of the transverse bulkhead 1.

A slurry loading pipe 6 and a slurry unloading pipe 7 are provided on the upper deck 5 of the ship, and a slurry water drain pipe 8 is provided in the double structure part of the bottom of the ship. The loading pipe 6 has a branch pipe 9 for each hold 2, and the loading pipe 6 and the branch pipe 9 are provided with hydraulically operated stop valves 10.
is provided. The slurry water drain pipe 8 also has a branch pipe 11 for each hold 2, and the branch pipe 11 is provided with a hydraulic remote control stop valve 12.
The suction port 13 at the tip is located in the slurry reservoir in the double structure of the transverse bulkhead 1. The pump room 3 is provided with a slurry water tank 14, the slurry water drain pipe 8 is connected to the inlet of the tank 14 via a plurality of valves 15, 16, 17 and a drain pump 18, and the unloading pipe 7 is connected to a plurality of It is connected to the outlet of the tank 14 via valves 19, 20 and a slurry water return/unloading pump 21. The front end of the loading pipe 6 on the upstream side of the first branch pipe 9 for the first hold 2 (on the right side of the drawing) and the front end of the unloading pipe 7 on the downstream side of the slurry water tank 14 are located on the upper deck 5 of the bow section. are connected by a connecting pipe 22, and the connecting pipe 22 is provided with a hydraulically operated stop valve 23.

When loading coal slurry in the above carrier, with the stop valve 23 of the connecting pipe 22 closed, a floating hose 24 for slurry loading is connected to the front end of the loading pipe 6, and a slurry water hose is connected to the front end of the unloading pipe 7. A return floating hose 25 is connected. Then, slurry is supplied to the loading pipe 6 through the floating hose 24 by a pump in the onshore facility, and by appropriately operating the stop valve 10 of the loading pipe 6, the slurry is supplied to all the holds 2 in order from the front hold 2. loaded. The slurry water that emerges on top of the coal particles during loading is collected from an overflow water outlet into a slurry sump and further collected by a pump 18 through a slurry water drain 8 into a tank 14 . A portion of the slurry water collected in the tank 14 is further sent back to the land facility by the pump 21 through the unloading pipe 7 and the floating hose 25.

Immediately after loading all the holds 2, the ship's pumps 18, 21 are stopped, the floating hoses 24, 25 are disconnected from the loading pipe 6 and the unloading pipe 7, and the front ends of these pipes 6, 7 are disconnected. is closed. Then, the stop valve 23 of the communication pipe 22 is opened, and the pumps 18 and 21 are driven again. As a result, the slurry water stored in the tank 14 is thrown into the hold 2 through the unloading pipe 7, the connecting pipe 22, the loading pipe 6 and its branch pipe 9,
The residual slurry in the loading pipe 6 and its branch pipe 9 is discharged into the hold 2 by this slurry water. A portion of the slurry water thus introduced into the hold 2 is collected in the tank 14 by the pump 18 and circulated as during loading.

[Brief explanation of the drawing]

The drawing is a partially omitted schematic plan view of a coal slurry carrier showing an embodiment of this invention. 2... Ship hold, 6... Slurry loading pipe, 7...
Slurry unloading pipe, 8... Slurry water drain pipe, 9
... Branch pipe, 10 ... Stop valve, 14 ... Slurry water tank, 18 ... Drainage pump, 21 ... Slurry water return and unloading pump, 22 ... Connection pipe, 23
...stop valve.

Claims (1)

[Scope of utility model registration request] A plurality of holds 2, a slurry loading pipe 6 having a branch pipe 9 with a stop valve for each hold 2, a slurry water drain pipe 8 for discharging slurry water dehydrated in the hold 2 during slurry loading, and this slurry water. In a slurry transport ship equipped with a slurry unloading pipe 7 which also serves as a means for returning slurry to land, a slurry water tank 14 is provided between the slurry water drain pipe 8 and the unloading pipe 7, and the slurry water drain pipe 8 is The unloading pipe 7 is connected to the inlet of the slurry water tank 14 via the slurry water return unloading pump 21, and the unloading pipe 7 is connected to the slurry water return unloading pump 21. A slurry transport ship characterized in that a downstream portion of the loading pipe 6 and a portion upstream of the first branch pipe 9 of the loading pipe 6 are connected by a connecting pipe 22 with a stop valve.