Mechanical Engineering Exam > Mechanical Engineering Questions > An air preheatera)increases evaporative capac...
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An air preheater
- a)increases evaporative capacity of the boiler
- b)increases the efficiency of the boiler
- c)enables low grade fuel to be burnt
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
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An air preheatera)increases evaporative capacity of the boilerb)increa...
Air Preheaters (APH) is the Shell and tube type Heat Exchangers used for preheating the air which is fed to the boiler or furnaces/kilns for combustion of fuels. Air Pre heater’s primary objective is to extract the waste heat from the flue gases leaving the boiler.
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An air preheatera)increases evaporative capacity of the boilerb)increa...
An air preheater is a device that is used to heat the air supplied to the boiler of a power plant or industrial facility. It recovers the heat from the flue gases and transfers it to the incoming air, resulting in several benefits:
Increase in evaporative capacity:
An air preheater increases the temperature of the air supplied to the boiler, which in turn increases the evaporative capacity of the boiler. This means that more water can be converted into steam, resulting in higher steam production. This is particularly beneficial in power plants and industrial processes where a large amount of steam is required.
Increase in boiler efficiency:
By preheating the combustion air, an air preheater reduces the amount of fuel required to reach the desired boiler temperature. This leads to improved boiler efficiency as less fuel is wasted. The increase in efficiency results in reduced fuel consumption and lower operating costs for the plant or facility.
Ability to burn low-grade fuel:
An air preheater also enables the combustion of low-grade fuel. Low-grade fuel typically has a lower calorific value and is less efficient when burned directly in the boiler. However, by preheating the air, the temperature of the combustion chamber can be raised, allowing for the efficient combustion of low-grade fuel. This provides flexibility in fuel selection and can result in cost savings, as low-grade fuel is often cheaper than higher-grade alternatives.
Conclusion:
In summary, an air preheater offers several advantages including increased evaporative capacity, improved boiler efficiency, and the ability to burn low-grade fuel. These benefits contribute to higher steam production, reduced fuel consumption, and lower operating costs. Therefore, the correct answer is option 'D', which states that an air preheater provides all of the above benefits.
Increase in evaporative capacity:
An air preheater increases the temperature of the air supplied to the boiler, which in turn increases the evaporative capacity of the boiler. This means that more water can be converted into steam, resulting in higher steam production. This is particularly beneficial in power plants and industrial processes where a large amount of steam is required.
Increase in boiler efficiency:
By preheating the combustion air, an air preheater reduces the amount of fuel required to reach the desired boiler temperature. This leads to improved boiler efficiency as less fuel is wasted. The increase in efficiency results in reduced fuel consumption and lower operating costs for the plant or facility.
Ability to burn low-grade fuel:
An air preheater also enables the combustion of low-grade fuel. Low-grade fuel typically has a lower calorific value and is less efficient when burned directly in the boiler. However, by preheating the air, the temperature of the combustion chamber can be raised, allowing for the efficient combustion of low-grade fuel. This provides flexibility in fuel selection and can result in cost savings, as low-grade fuel is often cheaper than higher-grade alternatives.
Conclusion:
In summary, an air preheater offers several advantages including increased evaporative capacity, improved boiler efficiency, and the ability to burn low-grade fuel. These benefits contribute to higher steam production, reduced fuel consumption, and lower operating costs. Therefore, the correct answer is option 'D', which states that an air preheater provides all of the above benefits.
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An air preheatera)increases evaporative capacity of the boilerb)increases the efficiency of the boilerc)enables low grade fuel to be burntd)all of the aboveCorrect answer is option 'D'. Can you explain this answer?
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