Ocean Thermal Energy Conversion and Titanium Plate Heat Exchanger
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1 Ocean Thermal Energy Conversion and Titanium Plate Heat Exchanger Akio Okamoto Manager KOBE STEEL, LTD. September 25, 2005 Titanium Technology Dep. KOBE STEEL, LTD. Institute of Ocean Energy, Saga University Japan XP-Plate Heat Exchanger Division, Xenesys Inc.
2 Contents 1. Five Issues In 21 st Century 2. Principle of OTEC 3. History of OTEC Development 4. Future on OTEC
3 Five Issues In 21 st Century Background Human beings civilization progressed greatly in the 20th century. Today at the beginning of the 21st century, however, we are confronting to new problems.
4 Five Issues in 21th Century Population Issue Water Issue Energy Issue 21st Food Issue Century Environment Issue
5 Solution of Five Issues By considering future economic growth and environmental problem, it is obvious that we must develop alternative energy resources to oil,gas,coal and uranium. One of the solutions of the problems is Ocean Thermal Energy Conversion (OTEC) System.
6 Integrated OTEC Hydrogen Potable Water Mineral Water Aquaculture Power Supply Fresh Water Reuse of DOW Local Area Chilling System Electricity Desalination Surface W. Deep Ocean Water (DOW) Lithium Ocean Thermal Energy Conversion (OTEC) Integrated OTEC System New Technology to Produce Energy,Water,Mineral and Food Without Surface Emissions Water of CO 2 Deep Ocean Water(DOW)
7 Principle of OTEC Technology
8 Temperature Distribution of Seawater There is a temperature difference of between 10 and 30 degrees Celsius in the Ocean. Power generation by OTEC is to utilize the temperature difference between warm and cold seawaters.
9 Principles of OTEC Technology 2Turbine 5Warm Seawater pump 1Evaporator 3Condenser 6Cold seawater pump 4Working fluid pump The principle is fundamentally the same mechanism used in thermal and nuclear power generation. One major characteristic of OTEC is the use of a working fluid such as ammonia,with a low boiling point.
10 OTEC Characteristics Emission of Carbon Dioxide (by Life Cycle Assessment Method) System of Power Generation Coal Petroleum LNG Hydro Solar Cell OTEC(2.5MW) OTEC(100MW) Kg-CO 2 /kwh Ocean thermal energy is a natural and renewable. Emission of carbon dioxide by OTEC is exceedingly low. is a clean energy which does not pollute the natural environment.
11 History of OTEC Development
12 Subject of OTEC Small temperature difference The temperature difference (10-20 degrees Celsius) between turbine inlet and outlet in OTEC is fairly smaller than that ( degrees Celsius) in thermal and nuclear power generation. Low thermal efficiency Because of the small temperature difference, the thermal efficiency of OTEC cycle is smaller than that in the thermal and nuclear power generation. Subject of OTEC The subject is to enhance the thermal efficiency and to reduce the sea water flow rate and surface area of evaporators and condensers.
13 For Thermal Efficiency We carried out the research of OTEC. Heat Cycle Uehara Cycle OTEC System Heat Exchanger Plate Heat Exchanger And get the solutions. Titanium Sheet
14 Principle of Uehara Cycle Uehara Cycle invented in 1994 by Dr.Uehara and Dr.Ikegami (Saga University) is the most efficient cycle for OTEC.
15 Plate Heat Exchanger (PHE) A cross section of tubular Heat effective range Fluid A cross section of plate channel Heat effective range Fluid PHE can improve heat transfer efficiency. Shell & tube heat exchanger Plate heat exchanger
16 Plate Material for OTEC PHE Thermal resource is sea water. Vapor pressure in plate channels is more than 0.9MPa. Titanium with High strength and Plates are manufactured by Press forming. Press formability
17 Titanium for PHE Suitable combination of chemical composition, cold rolling process, heat treatment have been studied. Stretch Forming Height(mm) Usual Process Advanced Process Tensile Strength(MPa) Relationship Among Stretch Forming Height, Tensile Strength and Manufacturing Process An advanced manufacturing process enables production of highstrength titanium sheet applicable to plate heat exchanger.
18 New Xenesys XP- PHE for OTEC New XP-PHE Plate pattern : XP-Plate Two phase OTEC duties All welded construction Very high heat transfer rate Very low pressure drop Very high design pressure High strength titanium
19 Features of New Xenesys XP-PHE XP-Plate is extremely efficient with extremely low pressure drop, which makes OTEC feasible. Titanium XP-Plate can stand high design pressure thanks to the high strength property and the plate geometry. Large flow rate can be handled both on seawater and working fluid sides with low pressure drop. PHE can be designed for countercurrent, cocurrent or cross flow. PHE can be installed vertically or horizontally. Plate can be pressed in different sizes. No leakage of working fluid due to all welded construction
20 Future on OTEC
21 Cost Estimation of Unit Cost of Electricity from OTEC Power Power Output Gross (MW) 1 25 Cost of Electricity (US$/kWh) Almost equivalent to the cost of diesel power The Indian 1MW Floating OTEC Plant An Overview Almost equivalent to the cost of thermal or nuclear power M.Ravindran, Director, National Institute of Ocean Technology IIT Campus, Chennai, India Proceedings of The International OTEC/DOWA Conference 99, 1999, pp. 2-9 OTEC is not unfeasible any longer.
22 Image of OTEC Plant
23 Potential Area of OTEC Suitable Area for OTEC and Temperature Difference Between Surface and 1000m Depth There are almost 100 countries suitable for OTEC.
24 Quantity of Titanium for OTEC Power Generation Output 10MW 100MW Quantity of Titanium 124mt - 180mt 1240mt mt There is a possibility to generate 1 billion MW by OTEC in the whole world. Indispensable Material to OTEC
25 Towards Large OTEC Plants Saga University Japan established Institute of Ocean Energy,Saga University (IOES) for study on integrated hybrid OTEC system in constructed experimental facilities of OTEC system in IOES by support of Ministry of Education,Culture,Sports,Science and Technology with budget of 40million us dollars in New Energy and Industrial Technology Development Organization(NEDO) Japan has started a study of 3MW power generation using waste heat discharged from an oil refinery plant. Titanium manufactures in Japan are planning to organize a national project team establishing a new process of refining titanium by support of Ministry of Economy,Trade and Industry.
26 Conclusions We firmly believe that Ocean Thermal Energy Conversion (OTEC) is one of the most reliable means to give a solution to the problems that humanity face. We are working to install the integrated hybrid OTEC plants in many countries.
27 END
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