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Archimedes Screw Turbines (ASTs) extract the potential energy from large blocks of moving water. The mass of the water turns the tilted turbine. The flow of that mass is controlled by hydraulically driven sluice gates. 水从顶部进入AST, and the significant weight of that water on the blades, 或“航班”, rotates the turbine generating power. If they enter the turbine, fish are not damaged. There is plenty of space for large or small fish, debris and ice to pass through the machine.
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A gearbox at the top of the screw connected to the generator produces standard three phase power for either the grid or direct users as state distribution laws allow. The entire facility is linked to an electronic monitoring and control system that runs automatically, communicating to an operator whenever requested. Safety, shutdown and management protocols are strict and efficient.
Selecting the AST: Choosing the largest AST may maximize the power output by utilizing high volumes of water for short periods of flood, but this increases cost for a machine that will not be effective for most of the year. 在另一个极端, 我们可以安装一个非常小的, less costly turbine that does not fully use the available flow of the waterway. Our goal is to find the right balance that is cost effective and operationally optimum, 并且可以得到适当的允许.
NEHC's expertise and experience enables us to find that balance among all of these elements, and to engineer the highest quality projects. Each site offers a unique engineering situation. Deriving the best project by project solution where respect for environmental issues, selection of the appropriate generation capacity, and determining stable cost factors enable us to drive toward the best return on investment for all parties.
在可行性阶段, two critical elements dictate the size of the AST: The drop in the water level from above the intake to below the discharge—roughly the height of the dam. A hydro-screw turbine runs most efficiently as a generator at a fixed slope range. This coupled with the drop determines the length of the machine. The second element is the volume of water available to pass through the machine.
Local rainfall and the size of the river catchment upstream or canal system and volume determine this. 另外, a key in the decision process is to protect both the aesthetics and environment of the site: An allowance is made for a significant water volume to by-pass the turbine and sustain the river habitat with continuing flow over dams, 即使在干旱时期. At every site this is part of the calculus that drives balance.
NEHC’s systems are designed for entirely safe operation under all conditions. Water flow velocities at the intake are kept low ensuring safe recreational activities. The entire screw mechanism and all the flow channels are fenced and secured to ensure that no one can fall in to the turbine. Every aspect of the electronic monitoring and control system is designed to be ‘fail safe’ so that if a problem occurs the system will automatically shut down without the need for power or intervention. There are operational and safety sensors as well as river height sensors customized to each installation.
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NEHC站点需要一个“发电站”.” One of the first questions NEHC constituents want to know is, “What does it look like?” The answer parallels the engineering conversation: Each site is unique and requires good selection and design sensibility. The goal is to create a facility that is a good complement to what is around it. It will be part of the local landscape for a relatively long period of time, so it is important. The power houses are tailored to the local 社区: wood clapboard, stone and brick facing along with more standard external materials are considered in the context of the project costs and the local environment.
The AST system is not in the middle of the dam, 但在每一种情况下, preserving the natural allure of seasonal water flow over each dam.
大坝和运河系统需要修复. 鱼需要迁徙. NEHC is careful to evaluate the quality of dams that are promising for power generation. 在某些情况下, these requirements may be beyond the company’s ability to repair and then build an economically viable generating facility. 在其他网站, there may be excellent reason to pursue both repairs and improvements prior to developing generation. Each site requires feasibility study to determine the course of action.
