JPS58188781A - Heating method of tank in frozen sea vessel - Google Patents

Abstract

PURPOSE:To prevent the freezing in a ballast tank by providing a heating tube in a tank of a frozen sea vessel such as an ice-breaker then feeding vaporous anifreeze heating medium to heat the target section with the latent heat of condensation. CONSTITUTION:It comprises snaked heating tubes 6 arranged at the bottom of the ballast tanks 1 at both sides of hull 2, a heating medium storage tank 7 in the engine room, a supply tube 11 passing through a pump 8, preheater 9 and evaporator 10 then branched to two pipe lines to both conduits 11 connected to both heating pipes 6, then going out of the ballast tank 1 and combined with a conduit communicating to the tank 7. Return hot water after cooling the main engine and steam are employed respectively in said preheater 9 and evaporator 10 for heat exchange. The ballast tank 1 is heated by the latent heat of condensation of the heating medium to prevent the considerable freezing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for heating tanks and the like in ice-sea vessels.

When ice-sea vessels such as commercial vessels and icebreakers navigate polar waters, the outside air concentration is generally below 150°C and the seawater humidity is below -2.0'C, so the ballast tanks inside the ship are The entire free surface of the water within can freeze. The water in the ballast tank is then trapped by a layer of ice on the surface. If the water in the ballast tank is sucked out and drained in this state, the ballast
Only a layer of surface ice remains at the top of the tank. If this surface ice layer cracks and falls due to impact, etc., there is a possibility that the equipment and bone components at the bottom of the ballast tank will be damaged. Therefore, it is desirable that large amounts of ice do not form within the ballast tank.

By the way, if a steam heating pipe, which is normally used in ships, is adopted to prevent the above-mentioned freezing, freezing of the drain becomes a problem at times other than when heating.

An object of the present invention is to provide a method for heating a tank or the like in an ice-sea vessel that solves the above-mentioned problems.

In order to achieve the above-mentioned purpose, the heating power method for tanks, etc. in ice-sea vessels of the present invention includes disposing a heating tube in a heated part such as a tank, supplying a vaporized antifreeze heating medium to the heating tube,
This is characterized in that the heated part is heated by the latent heat of condensation when this is condensed and liquefied.

Examples of antifreeze heating media include methanol and ethanol. By the way, if you compare the evaporation temperature, latent heat of condensation, melting point, and specific gravity of these and water,
As shown in the table below.

According to the heating method of the present invention, as described above, a heating tube is arranged in a heated part such as a tank, and an antifreeze heating medium is supplied to this heating tube, so that the problem of freezing of the drain is avoided. Does not occur. Therefore, troublesome work such as draining is not required.Moreover, if the heating medium is in the form of a hot liquid, the heating efficiency cannot be said to be sufficient. Since the heated part is heated by the latent heat of condensation, the heating efficiency is extremely high.

An apparatus for carrying out the method of the present invention will be explained below with reference to the drawings in comparison with a conventional example in which no heating is applied.

FIG. 1 shows a conventional example in which no heating is applied. In the figure, (1) is a ballast tank installed on both sides of the hull (2), and the water (3) filled inside is poured from the surface into the ballast tanks (1) on both sides. The surface of the car was frozen near the end. (4) is its surface frozen layer, and (5) is sea ice.

As shown in the figure, when the water in the ballast tank (1) is drained with surface ice 11 (4) present, only the surface ice @ (4) remains in the ballast tank (1). It becomes suspended in the air. Therefore, if an impact is applied to the surface ice (4) in such a state, there is a possibility that it will crack and fall.

Illustrated in FIG. 2 is an apparatus for carrying out the method of the invention, which apparatus includes ballasts on both sides of the hull (2).
a serpentine heating pipe (6) disposed at the bottom of the tank (1);
Heating medium storage tank (7) in the machine room and tank (7)
After passing through the pump (8), preheater (9) and evaporator (10) in the same room sequentially, the outgoing pipe (11) branches into two and connects to both heating pipes (6), and both heating pipes (6). ) to ballast/
Tank (1) goes outside and is combined into one tank (7)
It consists of a return pipe (12) leading to the pipe, forming a closed circuit as a whole.

The preheater (9) receives main engine cooling return hot water, and the evaporator (1)
0), steam is used for heat exchange, respectively.

The liquid antifreeze heating medium in the tank (7) is sent to the preheater (9) by the pump <8) to be preheated, and then it is evaporated by the evaporator (10) to form the vaporous antifreeze heating medium. and is supplied to the heating tube (6). Due to the temperature drop here, the heating medium is condensed and liquefied, and the latent heat of condensation at this time heats the ballast tank (1). Its unity,
Freezing of the ballast tank (1) is prevented. The liquefied heating medium is returned to the tank (7) through the recovery pipe (12), and thereafter circulated in the same manner.

The method according to the invention can be applied not only to the above-mentioned ballast tank but also to heating other tanks and embroidery inside the ship.

Note that if the antifreeze heating medium is nonflammable, a boiler may be used instead of steam to evaporate it.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a ship's hull showing a conventional example without a heating device, and FIG. 2 is a cross-sectional view of a ship's hull showing an apparatus for carrying out the method of the present invention. (1)...Tank, (6)...Heating tube. Above 11FIJlls7 Q 5 B 26 I
+1'f1t'111 Chojima [11 Haruki Tono1'4+
I'l υri person 1, held in 1982;
'1 Application No. 70689 2 □')2. U
＋・Heating method 1 for ice-sea vessels and tanks
^1i Ill 4・I-Luni 11 I゛1 with 1ri・11 series Mochi1γF applicant (
l 11 1-6-14 Edobori, Nishi-ku, Osaka (
,'l'l ゛名方・ (511) 1st generation disciple of Hitachi Kifune Co., Ltd.
Outside 1 person' J)li 1
11: The 11th Decree's ``1 Attachment 1 Ishikawa Year Month [■1i, hlillikoL increase V7J Wandering number 71I!i11 χl'J Column for detailed explanation of the invention in the specification.

Claims (1)

[Claims] An ice-sea vessel characterized in that a heating pipe is arranged in a heated part such as a tank, a vaporized antifreeze heating medium is supplied to the heating pipe, and the heated part is heated by the latent heat of condensation when the vaporized antifreeze heating medium is condensed and liquefied. heating method for tanks, etc.