Water ballast tank anti-sediment structure

Abstract

A water ballast tank anti-sediment structure comprises stiffeners arranged at the bottom of a water ballast tank at intervals. Multiple mud-disturbing devices used for repeatedly disturbing and breaking sedimented sediments and impurities are arranged at intervals above the stiffeners in the water ballast tank. The water ballast tank anti-sediment structure is simple in structure, low in cost, small in usage space, and can not change a ship structure or increase the weight of the ship structure, therefore the water ballast tank anti-sediment structure can be applied to any ship type, and the application range is wide. Due to the fact that the water ballast tank anti-sediment structure can directly resolve the problem that a large number of the sedimented sediments and impurities are continuously deposited on and adhesive to the water ballast tank which uses seawater as ballast water, the load capacity consumed by sludge in ship operation is reduced, and the use-cost of a ship is reduced greatly. Additionally, when the ship enters a dock for maintenance, through cleaning the water ballast tank by the anti-sediment structure, the workload of workers in cleaning the water ballast tank is reduced greatly, the ship maintenance work efficiency is improved, and the labor cost is lowered.

Description

technical field [0001] The invention relates to a ballast water tank on a ship, in particular to an anti-silting structure in the ballast water tank. Background technique [0002] The ballast water tank of a ship is a cabin where ballast water is placed to improve the stability of the ship. At present, the ballast water in the ballast water tank is taken from the seawater in the ship's driving area, and the water generally contains water brought by the impact of river water. Salt or calcified sediment, organic matter and minerals and other impurities, because these impurities have a large proportion, they are easy to form sediment and deposit at the bottom of the ballast water tank, and the deposited impurities are under gravity, water pressure, Under biological and chemical action, it will firmly adhere to the surface of the bilge, bulkhead and bone (that is, the steel plate), and these attachments usually have a corrosive effect on the bilge, bulkhead and bone, and damage...

AI Technical Summary

Problems solved by technology

[0002] The ballast water tank of a ship is a cabin where ballast water is placed to improve the stability of the ship. At present, the ballast water in the ballast water tank is taken from the seawater in the ship's driving area, and the water generally contains water brought by the impact of river water. Salt or calcified sediment, organic matter and minerals and other impurities, because these impurities have a large proportion, they are easy to form sediment and deposit at the bottom of the ballast water tank, and the deposited impurities are under gravity, water pressure, Under biological and chemical action, it will firmly adhere to the surface of the bilge, bulkhead and bone (that is, the steel plate), and these attachments usually have a corrosive effect on the bilge, bulkhead and bone, and damage the bilge, bulkhead And the paint layer on the surface of the aggregate, further destroying the mechanical properties of the bilge, bulkhead and aggregate, reducing the mechanical properties of the ballast water tank, and at the same time, increasing the weight of the ship itself, consuming effective deadweight tons, and increasing ship operation. economic burden

[0003] At present, the above-mentioned problems have not been solved, and those skilled in the art usually adopt the following methods to solve the problem of impurity deposition in ballast water tanks: 1. Utilize seawater filter technology and use special seawater filters to remove most of the seawater impurities, so as to reduce the ballast water tank. However, the filtration system with this kind of seawater filter has complex technology, high cost, and high power consumption. It is often necessary to increase the technical parameters such as the pressure head and power of the ballast pump, and change the principle of the ballast piping system. This kind of filtration system Although it can delay the impurity deposition time in the ballast water tank, but with the increase of the ship's voyage time, when the impurity deposition occurs in the ballast water tank, this kind of filtration system cannot solve the problem of impurity deposition in the ballast water tank. The filtration system will also occupy a certain amount of engine room space, reducing the space utilization rate of the ship's engine room; 2. No ballast water tank design means that no ballast water tank is designed on the ship, so there will be no impurities in the ballast water tank However, the design of non-ballast water tanks is only applicable to certain types of ships and is not a general technical solution; 3. Fresh water ballast water tanks use fresh water provided by port service facilities when ships call at ports It is poured into the ballast water tank to maintain the stability of the ship during operation. Although filling the ballast water tank with fresh water can better solve the problem of impurity deposition in the ballast water tank, however, the ballast water of large ships Filling the tank with fresh water will increase the cost of use of the ship, so it is only suitable for small and medium-sized ships; 4. The ballast water tank is designed as an upper and lower compartment structure, and the upper and lower ballast water tanks are separated on the bulkhead A vertical pipe connecting the two is provided, and the upper part of the vertical pipe is close to the roof of the upper ballast water tank, and the upper water tank is also provided with equipment for cleaning the water in the upper ballast water tank, thereby, through cleaning After the equipment cleans the water in the upper ballast water tank, the cleaner ballast water in the upper ballast water tank can be introduced into the lower ballast water tank through the vertical pipeline to delay the occurrence of impurities in the lower ballast water tank However, with the increase of the ship’s operating time, this structure still cannot avoid the problem of impurity siltation in the lower water tank. At the same time, this structure changes the hull structure of the ship, increases the structural weight of the ship, and increases It reduces the cost of shipbuilding and is not suitable for small and medium-sized ships; 5. Manually cleaning the accumulated impurities in the ballast water tank is also the most commonly used removal method at present. Clean up the silted impurities. Since the silted impurities in the ballast water tank are more and relatively firm, the working environment is harsh, which increases the working hours of the workers and the removal efficiency is low.

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