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Plant Technology| Lucky Electric Power Company

Plant Technology

Plant Technology

Type of Technology

  • This project consists of 1 x 660MW Super Critical Coal based high efficiency Low NOx Power Plant. Internationally recognized standards and statutory regulations will be followed for the plant and its equipment design, manufacturing, assembling, and testing.
  • The general trend in recent coal-fired power plants is to build larger size units, and most of the new coal-fired units built in the last five years have been in the 600 MW to 1,000 MW size range.
  • The advanced technology will consist of supercritical boilers, state of the art steam turbines and air emission controls including low-NOX burners, flue gas desulfurization, particulate collection, and continuous emission monitoring.
  • The Project will be based on proven technologies and use advanced coal plant designs to achieve efficient operation and competitive tariff.
  • The Project will be complete consisting of boiler, associated steam turbines, feed cycle, balance-ofplant equipment, electrical and l&C, material handling, coal receival, liquid fuel receival, coal piles, colony and other components.
  • Fuel Range

  • The boiler will be designed to burn a wide variety of bituminous imported coal from many potential sources. This is addressed in the fuel source section. This provides a range of fuel that would support economical fuel purchase.
  • Fuel sulfur content was also evaluated and a seawater flue gas desulfurization system can also be added, provided to burn higher content sulfur fuels which may be economically attractive to purchase.
  • The warm-up and ignition fuel will be high speed diesel (#2 diesel) oil. This fuel will provide initial firing and will stabilize the combustion until the coal flames are stable, about 30% to 35% load. Details of the design depend on the specific supplier chosen for the Project.
  • Supercritical vs. Subcritical:

  • An evaluation was performed to select the thermal cycle design. The higher Pressure of a supercritical cycle results in a higher efficiency than a subcritical cycle. A typical subcritical cycle has a maximum turbine throttle pressure of around 174 bar and a typical throttle pressure for a Supercritical cycle is around 248 bars. This difference in pressure results in a heat rate difference of up to approximately 2%. There are currently over 460 supercritical units in operation in China, Europe, Korea, Japan, and the United States, and a few in the developing countries. The European, Japanese, and recently, the Chinese suppliers have standardized on supercritical designs for units larger than 600 MW. With the High price of coal, the higher efficiency of the supercritical design justifies the higher capital cost. Capital cost of a supercritical versus a subcritical plant was also considered for the selection of the technology.
  • The capital cost of a supercritical plant is generally approximately the same as, or 2% higher than, a subcritical plant. Based on the above lx 660 MW gross (ISO) unit is selected.