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The excess air required for combustion of pulverised coal is of the order of
- a)100 to 150 %
- b)30 to 60%
- c)15 to 40%
- d)5 to 10%.
Correct answer is option 'D'. Can you explain this answer?
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The excess air required for combustion of pulverised coal is of the or...
Greater surface area per unit mass of coal allows faster combustion reactions because more carbon becomes exposed to heat and oxygen, This reduces the excess air needed to complete combustion. The excess air required for combustion of pulverised coal is of the order of 5 to 10%
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The excess air required for combustion of pulverised coal is of the or...
The excess air required for combustion of pulverized coal is of the order of 5 to 10%.
Explanation:
1. Introduction to Combustion of Pulverized Coal
- Pulverized coal combustion is a widely used method for generating heat and power in various industries.
- In this process, coal is ground into fine particles and then injected into a furnace or boiler, where it is mixed with air and combusted.
- The combustion of pulverized coal releases heat energy, which is used to generate steam or hot gases for various applications.
2. Excess Air in Combustion
- Excess air is the amount of air supplied to the combustion process above the stoichiometric requirement.
- The stoichiometric air-fuel ratio is the ideal ratio of air to fuel that would result in complete combustion without any excess air or unburned fuel.
- In practice, it is desirable to provide some excess air to ensure complete combustion and minimize the formation of pollutants.
- The excess air helps to provide sufficient oxygen for the combustion reaction and ensures that all the fuel particles are completely burned.
3. Excess Air Requirement for Pulverized Coal Combustion
- The excess air requirement for pulverized coal combustion varies depending on several factors, including the type of coal, the combustion equipment, and the desired combustion efficiency.
- Generally, the excess air required for pulverized coal combustion is of the order of 5 to 10%.
- This means that the amount of air supplied to the combustion process is 105% to 110% of the stoichiometric air requirement.
- The excess air helps to compensate for any variations in the coal quality, burner performance, or combustion conditions, ensuring that complete combustion is achieved.
4. Importance of Excess Air Control
- Controlling the amount of excess air is important for optimizing the combustion process and minimizing energy losses.
- Too much excess air can lead to energy losses, as the excess air needs to be heated and brought to the desired combustion temperature.
- On the other hand, insufficient excess air can result in incomplete combustion, leading to the formation of pollutants such as carbon monoxide (CO) and unburned hydrocarbons.
- Therefore, it is crucial to carefully control the amount of excess air supplied to the combustion process to ensure efficient and clean combustion of pulverized coal.
5. Conclusion
- The excess air required for combustion of pulverized coal is typically in the range of 5 to 10%.
- This ensures complete combustion and minimizes the formation of pollutants.
- Proper control of excess air is essential for optimizing the combustion process and maximizing energy efficiency.
Explanation:
1. Introduction to Combustion of Pulverized Coal
- Pulverized coal combustion is a widely used method for generating heat and power in various industries.
- In this process, coal is ground into fine particles and then injected into a furnace or boiler, where it is mixed with air and combusted.
- The combustion of pulverized coal releases heat energy, which is used to generate steam or hot gases for various applications.
2. Excess Air in Combustion
- Excess air is the amount of air supplied to the combustion process above the stoichiometric requirement.
- The stoichiometric air-fuel ratio is the ideal ratio of air to fuel that would result in complete combustion without any excess air or unburned fuel.
- In practice, it is desirable to provide some excess air to ensure complete combustion and minimize the formation of pollutants.
- The excess air helps to provide sufficient oxygen for the combustion reaction and ensures that all the fuel particles are completely burned.
3. Excess Air Requirement for Pulverized Coal Combustion
- The excess air requirement for pulverized coal combustion varies depending on several factors, including the type of coal, the combustion equipment, and the desired combustion efficiency.
- Generally, the excess air required for pulverized coal combustion is of the order of 5 to 10%.
- This means that the amount of air supplied to the combustion process is 105% to 110% of the stoichiometric air requirement.
- The excess air helps to compensate for any variations in the coal quality, burner performance, or combustion conditions, ensuring that complete combustion is achieved.
4. Importance of Excess Air Control
- Controlling the amount of excess air is important for optimizing the combustion process and minimizing energy losses.
- Too much excess air can lead to energy losses, as the excess air needs to be heated and brought to the desired combustion temperature.
- On the other hand, insufficient excess air can result in incomplete combustion, leading to the formation of pollutants such as carbon monoxide (CO) and unburned hydrocarbons.
- Therefore, it is crucial to carefully control the amount of excess air supplied to the combustion process to ensure efficient and clean combustion of pulverized coal.
5. Conclusion
- The excess air required for combustion of pulverized coal is typically in the range of 5 to 10%.
- This ensures complete combustion and minimizes the formation of pollutants.
- Proper control of excess air is essential for optimizing the combustion process and maximizing energy efficiency.
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The excess air required for combustion of pulverised coal is of the order ofa)100 to 150 %b)30 to 60%c)15 to 40%d)5 to 10%.Correct answer is option 'D'. Can you explain this answer?
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