Power Plant Systems

The safety valve is used to relieve pressure and prevent possible explosion of the boiler. When the pressure inside the boiler exceeds a certain limit, the safety valve automatically opens, allowing excess steam to escape and reducing the pressure. This helps to protect the boiler from damage and ensures the safety of the surrounding environment and personnel.

NCG stands for Non-Condensable gas. In geothermal steam, NCG refers to gases that cannot be condensed into a liquid state. These gases are always present in the steam and can cause inefficiencies in power plants. They lead to increased steam consumption and higher costs for the plant.

A prime mover refers to an engine or turbine that is responsible for providing the initial mechanical energy required to move the generator. It is the component that converts a form of fuel or energy into mechanical energy, which is then used to drive the generator and produce electricity. In this context, the prime mover acts as the primary source of power for the generator, enabling it to function and generate electricity.

A condensing turbine is the correct answer because it exhausts directly into a condenser at below atmospheric pressure. This type of turbine is designed to maximize the efficiency of the power generation process by extracting as much energy as possible from the steam. The low pressure in the condenser allows for the steam to be condensed back into water, which can then be recycled and used again in the steam cycle. This design is commonly used in power plants to generate electricity.

In a steam turbine generator, extraction refers to the process of removing a portion of the steam from the turbine at intermediate stages. This extracted steam can then be used for other purposes such as heating or industrial processes. It helps to optimize the efficiency of the overall system by utilizing the excess steam that would otherwise be wasted.

A low-water cut-off valve is a mechanical device that is installed in a boiler system to automatically shut off the burner or fuel supply when the water level in the boiler drops below a certain point. This is important because if the water level gets too low, it can cause damage to the boiler and potentially lead to a dangerous situation. The low-water cut-off valve helps to prevent this by ensuring that the boiler is not able to operate when the water level is too low.

The given correct answer is "Load gear". This suggests that the gear mentioned in the question is responsible for carrying the load between the prime mover and the generator. It implies that the load gear is designed to reduce the speed and increase the torque of the system, allowing for efficient power transmission. The load gear is an essential component in the overall gear system, ensuring smooth and effective operation between the prime mover and the generator.

The minimum plate thickness for a boiler plate should consider a corrosion allowance of 1/16". This means that the actual thickness of the plate should be 1/16" more than the required minimum thickness. Among the given options, the closest thickness to the required minimum thickness with the corrosion allowance is 5/16". Therefore, 5/16" would be the correct answer.

IGCC stands for Integrated Gasification Combined Cycle. This is a technology used in steam power generation where coal or other carbon-based fuels are converted into a gas through a process called gasification. The gas is then used to generate electricity in a combined cycle power plant, which involves both gas and steam turbines. This process is known for its high efficiency and lower emissions compared to traditional coal-fired power plants.

In Superheater operation, the steam piping is directed through the flue gas path in the boiler furnace. The temperature in this area is typically ranging from 1300-1600°C.