A steam power station requires space

Question

Examoogle · Accepted Answer

More than diesel power station

Explanation: A steam power station requires significantly more space than a diesel power station because it relies on a complex Rankine cycle involving massive auxiliary infrastructure like boilers, condensers, cooling towers, coal handling plants, and ash disposal systems. In contrast, a diesel power station is modular and requires only the engine, generator, and fuel storage, making it much more compact.

Working Principle: In a steam plant, water is converted to high-pressure steam in a boiler using coal combustion, which then expands through a turbine. This process necessitates vast facilities for water treatment, coal storage (stockyard), massive boiler units, flue gas cleaning, and thermal rejection components. A diesel station functions via direct internal combustion, eliminating the need for steam generation and heat exchange loops, hence the reduced footprint.

Key Formulas: $\eta_{thermal} = \frac{W_{net}}{Q_{in}}$ — efficiency of the power cycle; $V_{req} \propto 	ext{Complexity of Auxiliary Systems}$ — space requirement dependency

Key Points: Steam stations are typically base-load plants, whereas diesel stations are primarily for peak-load or standby applications.; Coal handling and ash handling systems in steam plants contribute to the majority of the land requirement.; The power density of diesel plants is much higher compared to steam plants.

Advantages: Diesel: Faster start-up time and black-start capability.; Steam: High fuel flexibility and suitability for large scale continuous power generation.

Disadvantages: Diesel: High fuel cost and operational maintenance per unit of electricity.; Steam: Massive land, water, and auxiliary equipment requirements.

Applications: Steam: Grid-connected large scale base load generation.; Diesel: Remote areas, backup for hospitals, and peak load shaving.

Additional Info: A typical coal-based thermal power plant requires hundreds of acres for coal storage and ash ponds alone.. Option C is incorrect because steam plants are essentially large industrial complexes.

Answer: B is correct — Steam power stations require more space due to the extensive auxiliary plant required for steam generation, cooling, and fuel handling compared to the self-contained nature of diesel engine units.

Exam Tip: Always remember that as the complexity of the energy conversion process increases (from mechanical to steam-based Rankine cycle), the spatial footprint required for auxiliary balance-of-plant equipment increases exponentially.

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