JPS59184094A - Device for preventing freezing of tank - Google Patents

Abstract

PURPOSE:To employ a small capacity of heat of a heating device for preventing freezing of a tank interior, by providing a horizontal partition wall in a tank to be located in the pole at a position corresponding to a freezing border plane, and providing heating pipes on the upside of the partition wall. CONSTITUTION:A horizontal partition wall 2 is provided in a tank T to be located in the pole at a position corresponding to a water surface W which is a freezing border plane. Heating pipes 3 are provided on the upside of the partition wall 2 to heat an upper chamber 4, thereby preventing an inside surface of the tank from being frozen. The horizontal partition wall 2 is formed with small holes 6 to secure communication between the upper chamber 4 and a lower chamber 5. In this manner, the upper chamber only which is required to be heated is heated, and accordingly it is possible to employ a small capacity of heat of a heating device for preventing freezing of an interior of the tank T.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tank antifreeze device.

In polar waters, the outside temperature is generally 150°C. In such sea areas, there may be a single tank containing water, a tank inside an offshore structure, or a tank on an ice-sea vessel. By the way, in such a place, the outside world above the water surface has a temperature rtt considerably lower than the freezing point of the liquid in the tank, and the outside world below the water surface has a temperature only slightly higher than the freezing point. In such a case, as shown in FIG. 1, the internal liquid freezes (I) on the inner wall surface of the tank (T>) in the portion above the water surface (W) that is in contact with the outside world.

Conventionally, in order to prevent such freezing, a heating pipe (1) was disposed at the bottom of the tank (<T) for ease of construction.

However, this requires 6 heat transfers to heat the entire tank, 8 times, 9 times, and 1 uneconomical.

An object of the present invention is to provide a tank antifreeze device that can solve the above problems with less heat ω.

In order to achieve the above object, the tank antifreeze device according to the present invention includes a horizontal partition wall provided in the tank at a position corresponding to the freezing boundary surface, and a heating pipe arranged above the horizontal partition wall. As a result, convection occurs only in the liquid in the upper section of the horizontal bulkhead and prevents freezing, while this heated liquid flows into the lower section of the horizontal bulkhead where heating is unnecessary. do not have.

Therefore, according to the present invention, only the above-mentioned upper section that needs to be heated is heated, which saves fuel consumption, and the horizontal partition wall also serves as a foothold when installing heating pipes, which is convenient.

An embodiment of the invention will be described below with reference to FIG.

The tank freeze prevention device shown in the figure has a horizontal bulkhead (2) installed in the tank (T) at a position corresponding to the water surface (W) which is the freezing boundary surface, and heating is applied to the upper side of the horizontal bulkhead (2). tube(
3) is installed. The horizontal bulkhead (2) has
The upper section (4) and the lower section (5) are provided with a large number of small holes (6) to ensure the flow of water.

When the upper section (4) is heated by the heating tube (3), convection occurs only within this section (4) as shown by the arrow in the drawing.
Freezing is prevented.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional example, and FIG. 2 is a cross-sectional view of the embodiment of the present invention. (W>...Frozen surface (water surface), (T)...Tank, (2)...Horizontal bulkhead, (3)...Heating tube. 4 other people

Claims (1)

[Claims] Freezing of a tank in which a horizontal partition wall (2) is provided in the tank (T) at a position corresponding to the freezing boundary surface (W>), and a heating pipe (3) is installed above the horizontal partition wall (2). Prevention device.