A self-dumping bulk carrier is a type of transport ship equipped with an automatic unloading system. It can carry out centralized manipulation and rapid automatic unloading operations without relying on port facilities. It is suitable for transporting bulk ore, grain, coal, etc. Its transportation costs and port costs are far lower than other bulk carriers that are not equipped with self-dumping equipment, which also makes shipowners gradually turn their attention to low-cost ship types, and self-dumping ships are undoubtedly a good choice.
The 55000-ton self-dumping bulk carrier is a type of high-efficiency self-dumping bulk carrier customized at the request of the Italian shipowner COECLERICI Group. It is mainly used for shuttle transfer of coal between the port and anchorage ships. It has low requirements on port conditions and good port suitability., flexible distribution and other characteristics. The main parameters of this ship are as follows:
Total length 193.99 m; length between vertical lines 185.00 m; profile width 32.26 m; profile depth 18.00 m; design draft 11.30 m; structural draft 12.80 m; deadweight 54300 t; total tonnage 33800; net tonnage 19400; cargo volume 71630 m3; fuel tank 1864 m3; diesel tank 540 m3; fresh water tank 465 m3; ballast water tank 15911 m3; Service speed (15% SM) 14.0 kn; endurance 18000 n mile; unlimited navigation area; crew of 39; flag country Italy.
Design indicators of this ship's self-dumping system: temperature range: -10 ℃~50 ℃, roll/trim: 2 °/5 °, maximum wind speed of 20 m/s, maximum wave height of 2.5 m, humidity of 90%, transportation medium: coal, grain, iron ore, crushed marble, gypsum, phosphate rock and other goods, unloading capacity of 5500 t/h or 6470 m3/h, and can operate continuously 24 hours a day.
All technical indicators of this ship meet the requirements of the latest specifications and rules, reaching the leading level of ships of the same type in the world today. Its main innovation points are:
1. It adopts a combination configuration of adjustable propeller, flap rudder and double nose side thrust, which has excellent controllability;
2. The position of the double bow side push holes and the design of the guide grooves were optimized, and the additional resistance of the ship was reduced to 2%;
3. Through three-dimensional auxiliary design, the huge dump system and its maintenance trails, platforms and dust protective covers are reasonably arranged on the deck, making the cargo bay section structural form simple and achieving high cabin capacity;
4. The main and auxiliary fenders are designed to meet the requirements of ship loading operation under different working conditions.
5. Through finite element analysis, the structure related to the dump equipment was optimized, and the deformation of the gantry guide rail and the vibration of the hull structure were effectively controlled;
6. By setting up overhead floors in the deckhouse area, reducing the height of crane cranes, hopper and gantry cranes, and adjusting the storage positions of hopper and gantry cranes, the requirements of international conventions for the line of sight of ship cabs are met.
This achievement has been authorized for 1 utility model patent (ZL2013 2 0123910.X, a self-dumping bulk cargo carrier).
This achievement has published 4 papers: "Design and Layout of Fender Equipment for 55000 DWT Self-Dumping Bulk Carrier", Ship Design Newsletter (No. 1, 2011);"Design Characteristics of 55000-ton Self-Dumping Bulk Carrier", Shanghai Shipbuilding Society (Proceedings of the 2013 Academic Annual Conference), etc.
Two ships of this type were built, all of which have been delivered and put into operation. After nearly a year of operation, this ship has proved that the design and construction of this ship are excellent. It has high efficiency of loading and unloading, no dust pollution during the whole process of loading and unloading, simple cargo hold section structure, and high cabin capacity utilization rate. The advantages are unmatched by traditional bulk carriers, which are in line with the overall trend of "safety, economy, health and environmental protection" in international shipping. The operation of this type of ship has injected new vitality into the world shipping market and has a positive effect in reducing transportation costs. The ship is equipped with a closed dust cover on the dump equipment, which can minimize dust pollution at the terminal. It has extremely high social benefits and is highly recognized by the shipowner.
This ship is the first full-deck self-dumping bulk carrier in China, which is a high value-added ship type. Through the design, research and construction of this ship, we have mastered the key technologies with independent intellectual property rights in the design and construction of this type of ship, and have improved our country's ability to design and build such self-dumping ships.