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Marine Power

data: Jan 08, 14views: 1080

Marine Power:


    As one of the most critical equipment supporting the ship, marine power is a high-tech product integrating electromechanical, information, materials, automation and other technology in one. This research direction centers on the technical requirements of high efficiency, low emission, low noise, high reliability and long life on marine diesel engine, focusing on collaborative innovation and cooperation in five technical directions such as the overall performance and optimization of structural design, efficient combustion and low emissions control, high-pressure common rail fuel injection as well as integrated electrical control, low -noise design, friction, wear and lubrication, etc. Since the IMG has been introducing increasingly stringent regulations on energy conservation, emission reduction and safety, and energy saving diesel engines, LNG/diesel dual-fuel engines, gas engines and other high-end products have become a new growth point of the market, and great efforts are being taken to the development of products with independent intellectual property, taking the R&D of marine diesel engine of our country to the development path supported by core technology.


Achievements:


1. Overall performance and the structure optimization design of Marine diesel engine
    Digital prototype technology, dynamic stress analysis technology and modular design technology have gradually been applied to the design research and development of advanced models abroad. Foreign research institutes usually set up each system of diesel engine model with advanced design techniques; the thermodynamics, kinetics and mechanical design analyses are usually launched. Next, the overall design of diesel engine system is determined; then, numerical 3D simulation research for diesel engine parts movement and detailed design for subsystem will be conducted. The team of this research completed the first domestic modular single cylinder diesel engine for ships during the 11th five-year plan of China, reaching the design requirements with regard to the performance test and reliability test.


2. High pressure common rail fuel injection and integrated electronic control technology
    For many years, HEU has been conducting researches on high pressure common rail fuel (HPCR) system with regard to simulation and calculation analysis, the optimization design of key parts such as solenoid valve, and integrated electronic control technology of diesel engine. So far, HEU has successfully completed the design of multi-type electric control system of diesel engine and put into application in batches, providing technical supports for the design of domestic HPCR system. The ongoing researches outrank others in China such as HPCR diesel engine oil pump simulation technology, high-speed solenoid valve calculation and optimization design technology, integrated electronic control technology for diesel engine, system thermal redundancy backup and switching technology, adaptive control of motor speed technology, intelligent control technology, calibration optimization matching technology and so on.


3. Ship increased wave resistance and stall prediction method
    The current EDDI (Energy Efficiency Design Index) put forward by the IMO (International Maritime Organization) has included the ship’s resistance performance in the wave as an assessment. As a result, it becomes a key index of the new ship design to optimize the ship design in order to keep the design speed in the wave. Since most of the large merchant ships sail in low and middle sea conditions, increased resistance in the short wavelength has become an important parameter to evaluate the performance of large vessel. HEU has put forward a new calculation method of increased resistance in the short wavelength based on the theory of total reflection and has made a proposal of calculation method of large ship increased wave resistance and stall prediction on behalf of China.


4. Technology for marine diesel engine with high-efficiency combustion and low emissions
    With rounds of new standards or the new specifications frequently issued by IMO, environmental protection requirements for ships have been raised constantly. Therefore, nitrogen oxides and sulfur oxide emissions become urgent topics for one of ship diesel engine researches. With a combination of machine measure and post-processing technology, HEU carried out researches on technologies for marine diesel engine with high-efficiency combustion and low emissions that meet IMO Tier III emission standard, and broke through the key technology of EGR system, SCR system for marine diesel engine and the exhaust gas washing desulfurization system. After having developed SCR system of marine diesel engine, exhaust gas washing desulfurization system test prototype, HEU is preparing for a certification from CSC for 4000 kw diesel engine exhaust gas washing desulfurization system.


5. Marine diesel engine tribology performance prediction and control technology
    Tribology in the diesel engine is mainly manifested in the friction, wear and lubrication of moving parts, with a close relationship with the diesel engine power performance, economy, reliability and emissions targets and vibration noise, which has become a key point when developing high power diesel engine. With independent intellectual property rights of has piston (ring) component dynamics and tribology coupling analysis software in the field of diesel engine tribology, HEU can replace the corresponding modules of foreign commercial softwares. With intimacy with many domestic enterprises, research institutes, HEU has a deep and cooperation, and achieved fruitful results in basic research, active model improvement and development of new models, etc.


6. Ship wave resistance and stall prediction method
    According to the current EEDI issued by the IMO, resistance performance of ships in waves has been included in the evaluation indices. Therefore, how to optimize the design of the ship design and sailing in the waves keep speed become the key indicators of new ship design. Due to the fact that large merchant ships sail most in low sea state, so wave resistance increase in the short wavelength has become an important parameter to measure the performance of large ships. Based on the total reflection theory, the team puts forward a new calculation method for the resistance in shortwave increases, and put forward a proposal of wave resistance and stall calculation methods of large ship on behalf of China.


7. Ship propulsion shafting and device vibration control technology
    The IMO has taken the underwater radiation noise as an indicator in ship evaluation. With the ship's power plant as the first of three major noise sources, the control of ship power plant especially propulsion shafting and device vibration becomes the key technology in the field. Ever since the very beginning, HEU has been doing ship shafting vibration research and published in domestic field the first shafting vibration monograph. Now, it has shifted the perspective in the researches on vibration of shafting and equipment from the previous security to the reduction of ship underwater radiation noise, with guidance available for shaft and equipment for vibration control in the multiple enterprises.


Future Research Directions:
(1)research on low-temperature combustion technology of marine diesel engine;
(2)research on lean premixed combustion technology of ship gas engine;
(3)research on exhaust DeNOx technology of marine diesel engine;
(4)research on exhaust wash and desulfurization technology of marine diesel engine;
(5)research on integration of exhaust DeNOx and desulfurization technology of marine diesel engine;
(6)research on ship propulsion shafting and equipment vibration control technology;
(7)prediction and control technology of tribological performance of marine diesel engine;
(8)research on forecasting design and optimization of the high-pressure common rail fuel injection system;
(9)research on optimizing design technology of key parts such as high-speed solenoid valve;
(10)research on optimizing design and implementation technology of diesel embedded control system;
(11)research on intelligent control technology of diesel engine;
(12)research on integrated electronic control technology based on multi-objective optimized diesel engines;
(13)Research on dynamic strength analysis of key components of marine diesel engines.

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