JPS58199299A - Heat-insulating device for cargo tank - Google Patents

Abstract

PURPOSE:To prevent generation of temperature difference at the cargo stored in a tank by forcedly circulating the gas contained between the tank and heat insulation while heating the gas. CONSTITUTION:A space A is formed between a tank 2 and heat insulation 3 to house the gas. This gas in space A is forcedly circulated in the direction of arrow 6 by a rotating fan 5 and heated during the cirulation by pipe 4 for circulation of a thermal medium to attain a certain specific temperature. Thus heat transmission can be made to the cargo in the tank 2 evenly and the cargo is heated uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for maintaining the temperature of a cargo in a tank at a suitably high temperature, particularly a mixture of coal fine particles and coal liquefied fluid;
It will be abbreviated as “COM” hereafter. This invention relates to a cargo tank ill device suitable for storing suspensions such as (1) and (2) while maintaining a uniform fluidity at a temperature that maintains uniform fluidity.

In general, cargo tank warming devices for transporting suspensions such as COM are designed to maintain the suspension at a required high temperature.
The tanker is adapted to maintain the suspension at 70-80°C.

Conventional cargo tank heat insulation devices of this type include a heat insulating layer that surrounds the cargo tank to prevent heat from escaping to the outside. A space containing gas for heating is provided, and the gas in this space is heated by receiving heat from a heat medium distribution pipe provided in the space.

However, in such conventional cargo tank heat insulation devices, the heat from the heat medium distribution piping particularly strongly heats the gas around the piping, and the high temperature gas is exposed to the outer surface of the cargo tank that comes in contact with the piping. As a result, the temperature of the suspension in the tank near the piping becomes particularly high, and
The temperature of the suspension leaving the piping will be kept relatively low.

In this manner, the conventional apparatus suffers from the problem of uneven temperature of the suspension in the cargo tank.

And due to the temperature unevenness of this suspension.

If the 00M suspension is heated to 90°C or higher, it has the disadvantage of having a negative effect on the additives in the suspension;
When the M suspension cools below 70°C, it has the disadvantage that it loses its uniform fluidity.

The present invention aims to solve these problems.
To provide a cargo tank heat retention device that uniformizes the temperature of gas contained in a space between a heat insulating layer and a cargo tank, and enables even heat transfer from the gas to the cargo in the tank. purpose.

For this reason, (1) the cargo tank heat insulation device of the present invention is provided with a space containing gas for heating the cargo in the tank between the cargo tank and the heat insulating layer surrounding the tank, and a space containing gas for heating the cargo in the tank. In order to heat the cargo in the tank, heat medium distribution piping is provided in the same space, and the temperature of the gas in the space heated by the piping is made uniform to transfer heat to the cargo in the tank. (The present invention is characterized in that a fan and its driver are provided for forcibly circulating the gas in the space.

Hereinafter, a cargo tank heat insulating device as an embodiment of the present invention will be explained with reference to the drawings.
It houses a cargo tank 2 for loading.

This tank 2 is provided with a heat insulating layer 3 surrounding its outer surface, and between the tank 2 and the heat insulating layer 3 is a gas (such as air) for heating the 00M suspension as cargo in the tank 2. ) accommodated □.

Space A is provided.

In this space A, a heat medium flow pipe 4 is provided in order to heat the gas in the space A. Note that steam or hot water is flowing in this pipe 4 as a heat medium.

Further, in this space A, a fan 5 is provided near the top of the tank 2, and this fan 5 is rotatably driven by a drive device such as an electric motor or an oil motor (not shown).

By rotating the fan 50 times, the gas in the space A between the heat insulating layer 3 and the tank 2 is forced to circulate in the direction of the arrow 6 in the figure. Due to this circulation, the temperature of the gas in space A becomes almost uniform, and heat transfer to the cargo in tank 2 is performed evenly. is maintained properly. 00
A suitable holding temperature for the M suspension is 70 to 80°C.

Further, according to the present device, the heat transfer coefficient from the heat medium in the pipe 4 to the tank 2 increases, and the heat transfer coefficient to the outer surface of the tank 2 increases, so that efficient heating can be performed.

Note that the cargo tank 2 is supported within the hull by aggregates 7.

As described above in detail, the cargo tank heat retention device of the present invention has the following effects and advantages.

+11 The heat transfer coefficient of the outer surface of the tank 2 and the outer surface of the pipe 4 becomes significantly larger than that of conventional devices, and the heat transfer efficiency increases. Therefore, the length of the heat medium distribution pipe 4 can be shortened or the flow rate of the heat medium can be reduced.

(2) The temperature on the outer surface of the tank 2 is made uniform, so that partial overheating in the vicinity of the heat medium distribution pipe 4 can be prevented, and deterioration of the properties of the cargo can be prevented.

[Brief explanation of drawings]

The figure is a cross-sectional view showing a case where a ship is equipped with a cargo tank heat insulation device as an embodiment of the present invention. 1. Hull, 2e. Cargo tank, 3. Heat insulation layer, 4.
Heat medium distribution piping, 5. Fan, 6. Circulation direction, 7.
Fist aggregate, Aφ/space.

Claims (1)

[Claims] A space containing gas to heat the cargo in the tank is provided between the cargo tank and the insulation layer surrounding the tank, and a space is provided within the space to heat the gas in the space. A fan is provided with heat medium distribution piping and forcibly circulates the gas in the space in order to uniform the temperature of the gas in the space heated by the piping and transfer heat to the cargo in the tank. A cargo tank warming device, characterized in that it is provided with a driving machine.