Examples of Prime Mover Control Systems

Figure 13-15 is a block diagram of a Woodward Governor comprehensive multi-engine control system, a family of modules that include speed control, load control, engine control, monitoring, and sequencing. This system may be used with gas, Diesel, and dual-fuel engines in mechanical drive and power generation applications. The digital control application program is created in application block language software (ABLS), designed to be programmed by non-software engineers. The graphical application programmer (GAP) allows the ABLS to be programmed graphically, and it automatically creates the documentation for the software.

Figure 13-16 shows a representative block diagram illustrating the control systems applied to a power generation system featuring an extraction steam turbine. The control system has a full range of turbine-control functions, including conditional sequencing based on the information it receives through its discrete and analog functions. The system receives redundant input signals from all three CPUs and, based on a comparison of data and a two-out-of-three voting system, generates outputs to the active coil of a dual-coil actuator for turbine control.

Figure 13-17 shows a representative diagram of a control system for a gas turbine applied to mechanical drive service in a gas compression station. This system provides fuel control, automatic start/stop sequencing, temperature sensing and limiting, speed control, nozzle control, alarming functions, and compressor surge control. All of the control information is available through modem for remote control of operations and troubleshooting.

Figure 13-18 shows a comprehensive integrated boiler/turbine-generator control system. This system would be applied in large capacity plants, such as central utility plants, to coordinate the boiler and turbine-generator for fast and efficient response to automatic load dispatch controls. In its basic form, the system consists of ratio controls that monitor pairs of controlled inputs, such as boiler energy input to generator energy output and fuel flow to feedwater flow.

Mtu Engine Governor
Fig. 13-15 Block Diagram of Comprehensive Multi-Engine System Digital Control System. Source: Woodward Governor
Governor Woodward
Fig. 13-16 Representative Block Diagram of a Steam Turbine-Generator Set Control System. Source: Woodward Governor
Fig. 13-17 Diagram of Control System for a Gas Turbine Applied to Mechanical Drive Service. Source: Woodward Governor
Diagram Heat Mover
Fig. 13-18 Integrated Boiler Turbine-Generator Control System. Source: Babcock & Wilcox
Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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