Ship buoyancy control system

Abstract

The invention relates to a ship buoyancy control system. The tank (10) of a ship (1) has an inflow port (6) and an outflow port (7) that are opened in the ship bottom (13) and arranged at an interval in the advancing direction of the ship body. An opening closing means (9) is provided to each of the inflow port and the outflow port. The opening closing means closes each of the inflow port and the outflow port so as to ensure ship body buoyancy by means of air in a space in the tank. With the inflow port and the outflow port, outboard seawater is captured through the inflow port using the advancing movement of the ship body and seawater in the tank is allowed to flow overboard through the outflow port. A partition wall (2) forms in the tank a weir extending in the width direction of the ship body to section the area in the tank into an inflow area (3) and an outflow area (4). The tank, the partition wall, the inflow port, the outflow port and the opening closing means constitute the buoyancy control system of the ship. Accordingly, ballast water is replaced with seawater with a simple construction without depending on a forced replacing drive device, and a high ballast water / seawater replacing rate is attained.

Description

technical field [0001] The present invention relates to a ship's buoyancy control system (Buoyancy Control System). The ballast-free buoyancy control system of the ship used in the hull structure of the ballast ship. Background technique [0002] Generally, a ship sailing under an empty state or a lightly loaded state carries ballast water to ensure a certain draft and stabilize the hull while preventing bottom slamming and propeller runaway. Typically, ballast tanks are flooded at the discharge point and drained at the loading point. The marine organisms in the unloading place are transported to the loading place by the ballast water in the ballast tank, and are discharged into the sea area of ​​the loading place. As a result, problems such as ecosystem change and ecosystem destruction occur in the sea area of ​​the loading place. Since ballast water is moved and discharged around the globe, marine organisms such as plankton mixed in ballast water may move to sea areas th...

AI Technical Summary

Problems solved by technology

[0006] However, in such a forced exchange method, the hull must be equipped with seawater exchange equipment including forced circulation devices and in-ship pipelines, and the seawater exchange equipment must be driven to exchange seawater.

Moreover, the current situation is that even if seawater exchange equipment is used to inject water three times the tank capacity into the ballast tank, only about 83% of the seawater replacement rate can be achieved. In order to achieve a seawater replacement rate of more than 95%, at least Inject seawater more than five times the capacity of the tank into the ballast tank

Therefore, if a sufficient seawater replacement rate is to be realized by the ballast water exchange device of the forced exchange method, a large amount of fuel and power for driving equipment such as pumps need to be consumed, and a large amount of money is required for the operation of the equipment. time and labor

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