JPS58206479A - Comfuel carrier vessel - Google Patents

Abstract

PURPOSE:To keep the temp. in a tank and to prevent explosion by supporting the tank on inclined bottom plates of a ship with the aid of reinforcing aggregate installed at the outside circumference of the tank, by furnishing the tank with a heating device and a thermal protective layer at the outside circumference, and by supplying inert gas into the tank. CONSTITUTION:In a ship, an independent tank 2 for mixed fuel of coal and petroleum is installed by forming a groove 1' at the bottom with inclined bottom plates 7, 7'', and a reinforcing aggregate 6 of longe or trans material is installed at the outside surface of the tank in order to smooth the interior surfaces of the tank 2. A heating device and a thermal protective layer 3 equipped with lines 5 for heat medium along the outside surface of the tank 2 are furnished, and inert gas is supplied into the tank 2 from a gas source on the deck. Mixed fuel of coal and petroleum stored in the tank 2 is heated by the heat medium flowing in the lines 5 and held at a proper temperature by the thermal protective layer 3. The inert gas in the tank 2 serves to prevent occurrence of explosion accident.

Description

[Detailed Description of the Invention] The present invention provides a coal oil mixed fuel (coal oil m1
xture; hereinafter abbreviated as COMQ)'(il-Related to a ship for transportation while maintaining fluidity at high temperatures.

With the rise in oil prices, coal is being reconsidered as a source of oil and fuel, and the demand for coal is increasing.However, when one coal is used as a fuel, one coal is solid, so its transportation, etc. is handled as one liquid such as petroleum. It is more difficult than

Therefore, COM is made by finely disintegrating coal and mixing it with crude oil or heavy oil.
As a result, a method of transporting and burning it has been devised.

However, when transporting coal/oil mixed fuel by ship, there are the following problems: (1) COM has a high viscosity, so it loses its fluidity at room temperature, making it extremely difficult to handle by unloading with a pump. Become something. Therefore, it is necessary to raise the temperature of COM to an appropriate temperature to give it fluidity.

However, if the temperature rises too much, the pulverized coal in the COM will settle downward, causing problems during unloading.

Therefore, when raising the temperature of the COM, it is necessary to take care not to raise the temperature locally.In order to maintain the O COM at an appropriate temperature, using only a heating device causes a large heat loss and is uneconomical.

(2) The cargo tank becomes hot, causing thermal expansion.

Therefore, when a cargo tank is fixed to a main hull structural member or a cargo tank is formed from a main hull structural member, large stress is generated at the connection with the main hull structural member. (3) Keep the COM at an appropriate temperature. Even if it is retained, it still has a high viscosity compared to heavy oil, so it has poor fluidity.
If there are protrusions such as aggregate on the inner surface of the tank, it will accumulate.In addition, the pulverized coal in the COM will settle and remain due to the shaking of the ship, which will deteriorate transportation efficiency.

(Due to the high viscosity of 41COM, sufficient consideration must be given to its cargo handling equipment such as cargo pumps and cargo handling equipment.)

If the COM piping system is a centralized piping system, which is commonly used in crude oil tankers, etc., if the cargo tank is far away from the cargo pump, the long pipe will make the cargo pump unable to suction the COM. be.

(5) Even if the bottom of the cargo tank is sloped, a certain amount of cargo may remain after being unloaded into the COM' by the cargo pump.

(6) During cleaning of the cargo tank, flammable gas is generated from the COM, so it is necessary to supply inert gas to prevent explosions into the cargo tank.

In this case, if a normal inert gas is used, the temperature thereof is lower than the appropriate temperature of the COM, so the fluidity of the COM is impaired.

The present invention seeks to solve the above-mentioned problems.

The purpose is to provide a ship that can efficiently transport coal and oil mixed fuel.

For this reason, the coal/oil mixed fuel carrier of the present invention is equipped with an independent tank for coal/oil mixed fuel, the bottom of which is completely grooved with an inclined bottom plate. In addition to installing reinforcing aggregate, a heating device and a heat shield layer were installed along the outer surface of the tank to keep the coal/oil mixed fuel inside the tank warm.

A dedicated pump with a suction port connected to the bottom of the tank via suction piping, and a 1-
The tank is characterized in that it is provided with a cleaning device disposed at the upper part of the tank, and is also provided with equipment for supplying high-temperature inert gas into the tank.

A coal/oil mixed fuel carrier as an embodiment of the present invention will be explained below with reference to one drawing.

Figure 1 is a cross-sectional view of the hull of the ship, in which reference numeral 1 indicates the inner surface of the cargo tank, 2 indicates the cargo tank, 3 indicates a thermal insulation layer provided around the outer periphery of the cargo tank, and 4 indicates a heat medium as a heating device. The flow guiding member 5 indicates a heat medium flow path.

The inside of the tank 2 is divided into left and right halves by a central partition wall 7, and grooves 1' are formed at the bottom of each divided part by inclined bottom plates 7' and 7''. In order to achieve this, all of the reinforcing aggregates 6 are attached to the outer surface of the tank 2.0 In Fig. 1, reference numeral 8 is the hull outer plate, 9 is the hull structural aggregate, and 10
11 indicates a double-bottom flat plate, and 11 indicates a supporting member.

The cargo tank 2 has a cargo tank aggregate 6 and a double bottom inclined plate 10.
In this way, this COM cargo tank is configured as an independent tank separated from the main hull structural members. Each tank 2 has a dedicated A pump 12 is provided, and the suction port of the pump 12 is connected to a suction nozzle (suction piping).
13' (Il- is connected to the groove 1' at the bottom of the tank, and the discharge port of the pump 12 is connected to the discharge pipe 1
Connected to 4.

In addition, it is effective to provide the cargo pumps, cargo pipes, valves, etc. with heat-insulating layers and heating devices in the same way as cargo tanks.

As the COM piping system, an independent piping system in which one dedicated cargo pump 12 is provided for one cargo tank is adopted so that the suction/pump 13 is short.

The line 15 is a discharge pipe], which is branched from the cargo tank internal washer 1 provided in the tank 1.
5', a shutoff valve 16 is provided in the discharge pipe downstream from the above-mentioned branch point, and the cleaning line 15
is provided with a shutoff valve 16'.

Furthermore, an inert gas supply source 17 is provided.

The inert gas heated by the heater 17' is supplied to the cargo tank 2 through the inert gas supply pipe +8i.

FIG. 2 is a cross-sectional view of two parts of the hull showing a modified example of the heat medium guiding member 4, and the reference numeral 1 in FIG. 2 indicates the inner surface of the cargo tank;
3 is a thermal insulation layer for heat retention, and 4 is a heat medium guiding member provided separately from the cargo tank inner surface 1. The COM loaded in the cargo tank 2 is heated by the heat medium flowing in the heat medium flow path 5. It is heated and maintained at an appropriate temperature by the heat insulating layer 3.

In addition, in the case of the modification shown in FIG. 2, since the heat medium guiding member 4 is provided apart from the cargo tank inner surface 1, the tank inner surface 1 is indirectly heated through the air. In addition, since the cargo tank 2 becomes hotter than the surrounding hull structure, it thermally expands and is displaced on the support material 〇 When discharging to the COM' in the cargo tank 2.

The pump 12'i is driven to suck the air into the COM' through the suction pipe 13, and transport it to land through the discharge pipe 14 and the shutoff valve 16.

At the final stage of unloading work, the inside of the cargo tank 2 is cleaned, but for this purpose, the shutoff valve 16 is closed and the shutoff valve 16 is closed.
It is sufficient to operate the pump 12 with the pipe 13 open. Pump 12. Discharge pipe 14 and cleaning line 1
5 and is ejected from the washer 15' into the cargo tank 2 to wash away residual cargo adhering to the tank wall surface and the inclined bottom plate 7'.

Inert gas is supplied to the upper space within the cargo tank 2 from an inert/active gas supply source 17 through an inert gas supply pipe 18, thereby making it possible to prevent an explosion inside the tank.

The temperature of this inert gas is set in advance to a temperature commensurate with the temperature of the cargo, so as not to cool the heated cargo.

The effects and advantages of the coal/oil mixed fuel carrier of the present invention are enumerated below.

(1) All of the reinforcing aggregate for the tank is placed on the outer surface of the tank, the bottom of the tank is provided with a groove formed by a sloped bottom plate, and a heating device is installed around the tank's outer circumference, and a heat insulating material is used to secure the cargo tank. Because of its structure, it is possible to efficiently unload coal/oil mixed fuel, which is difficult to handle due to its high viscosity at room temperature.

In addition, a cargo pump and cargo handling piping are dedicated to each cargo tank to shorten the pipeline as much as possible, which prevents the cargo temperature from dropping midway through the pipeline and reducing cargo handling efficiency. .

In the example shown in FIG. 2, even if high-temperature steam or the like is used as the heat medium, it is still one indirect heating.

There is no risk of the cargo being locally overheated and causing deterioration of its properties.

(2) The inside of the tank can be cleaned by circulating the loaded cargo, even with highly viscous cargo.

All cargo can be unloaded.

(3) By introducing inert gas at a temperature commensurate with the cargo temperature into the tank interior space, explosion-proof function can be maintained without cooling the cargo.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the hull of a coal/oil mixed fuel carrier as an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a modification of the heating device in the carrier. 1.-tank inner surface, 1'...groove, 2.-tank, 3φ
・Heat barrier layer, 4...Heat medium guiding member. 5. Heat medium flow path, 6. Reinforcing aggregate, 7. Partition wall,
7', 7"... Sloped bottom plate, 8... Hull outer plate. 9... Hull structural aggregate, 10... Double bottom flat plate. 11... Support material, 12... Pump, 13... Sakunyong pipe. , 14...Discharge pipe, 15...Line, 15'...Cargo tank internal washer, 16.16
'...Shutoff valve, 17...Inert gas supply source, 17'...
Heater, 18...Inert gas supply pipe. Sub-Agent Patent Attorney Yoshihiko Ion

Claims (1)

[Claims] A coal-fired vessel in which a groove is formed on the bottom of a ship with an inclined bottom plate.
Equipped with an independent tank for oil mixed fuel. Reinforcing aggregate is attached to the outer surface of the tank to smooth the inner surface of the tank, and a heating device and a heat shield layer are installed along the outer surface of the tank to keep the coal/oil mixed fuel inside the tank warm. established. A dedicated pump with a suction port connected to the bottom of the tank via suction piping, and a washer connected to the discharge port of the pump and placed at the top of the tank are installed. 5. A coal/oil mixed fuel carrier that is equipped with equipment to supply high-temperature inert gas into the vessel.