Which of the following devices is used to generate and supply steam at high pressure and temperature?
Steam boiler
Understanding High Pressure Steam Generation
The question asks to identify the device used for generating and supplying steam at high pressure and temperature. Let's look at the function of each option provided.
- Steam pump: A steam pump uses steam pressure to move water or other fluids. It does not generate the steam itself; it uses steam generated elsewhere.
- Steam boiler: A steam boiler, also known as a steam generator, is a closed vessel where water is heated to produce steam. Boilers are specifically designed to heat water under pressure, turning it into high-temperature, high-pressure steam for various applications like power generation, heating, or industrial processes.
- Steam engine: A steam engine is an external combustion engine that performs mechanical work using steam as its working fluid. It consumes steam (usually generated by a boiler) to create motion. It does not generate the steam.
- Steam turbine: A steam turbine is a device that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft. Like a steam engine, it uses steam but does not generate it.
Based on the function of each device, the steam boiler is the apparatus specifically used for the process of generating steam, often to meet demands for high pressure and temperature.
| Device | Primary Function | Generates Steam? |
|---|---|---|
| Steam Pump | Moves fluids using steam pressure | No |
| Steam Boiler | Generates high-pressure, high-temperature steam from water | Yes |
| Steam Engine | Converts steam energy into mechanical work | No (consumes steam) |
| Steam Turbine | Converts steam energy into rotational mechanical work/power | No (consumes steam) |
Therefore, the device that generates and supplies steam at high pressure and temperature is the steam boiler.
Revision Table: Key Steam Concepts
| Concept | Description |
|---|---|
| Steam Generation | The process of heating water to its boiling point and beyond to turn it into steam. Boilers are central to this. |
| High Pressure Steam | Steam produced and maintained at a pressure significantly above atmospheric pressure. This allows for more efficient energy transfer. |
| High Temperature Steam | Steam that is superheated (heated above its saturation temperature at a given pressure). Superheated steam contains more energy and is used in turbines for efficiency. |
| Steam Cycle | A thermodynamic cycle (like the Rankine cycle) used in power plants where water is heated into steam in a boiler, expands through a turbine (doing work), is condensed back to water, and pumped back to the boiler. |
Additional Information on Steam Boilers
Steam boilers are essential components in many industries and power plants. They vary in design depending on the required pressure, temperature, and capacity. Common types include:
- Fire-tube boilers: Hot gases pass through tubes surrounded by water. Generally used for lower pressures and capacities.
- Water-tube boilers: Water passes through tubes surrounded by hot gases. Preferred for high pressure and high temperature applications, such as in large power plants.
The efficiency and safety of steam generation are critical aspects of boiler operation, requiring careful design, maintenance, and control systems.
Important Questions from Boilers
Which of the following is primarily known as a 'Forced Circulation' boiler?
In a steam power plant, blow down is basically nothing but wastage of _______ from the boiler.
Benson boilers have ______ water drum(s).
______ is NOT a water tube boiler.
Which of the following is a type of fire-tube boiler?
