VIPSolutionsAct like a helpful tutor and exlain me : Give step-by-step solution with explanation and final answer: ( c ) Discuss briefly TWO ways of improving the boiler efficiency for the above coal - fired boiler by reducing the amount of excess air. ( 4 marks ) ( d ) It is proposed to use bagasse from sugar cane instead of coal in the above boiler. Discuss briefly TWO advantages for such a proposal in terms of environmental aspects.
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Act like a helpful tutor and exlain me : Give step-by-step solution with explanation and final answer: ( c ) Discuss briefly TWO ways of improving the boiler efficiency for the above coal - fired boiler by reducing the amount of excess air. ( 4 marks ) ( d ) It is proposed to use bagasse from sugar cane instead of coal in the above boiler. Discuss briefly TWO advantages for such a proposal in terms of environmental aspects.
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Asked by: manish kumar
Created at: 2025-10-01 00:51:14
Asked by: manish kumar
Created at: 2025-10-01 00:51:14
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# (c) Two Ways to Improve Boiler Efficiency by Reducing Excess Air
**Background:**
In coal-fired boilers, excess air is supplied to ensure complete combustion, but too much excess can reduce boiler efficiency by carrying heat away with the flue gases.
## 1. **Install and Use Oxygen (O₂) or Combustion Gas Analyzers**
- **Explanation:**
By continuously monitoring the oxygen content in the flue gases, operators can optimize the air-fuel ratio to supply just enough air for complete combustion—minimizing excess air.
- **Benefit:**
This reduces the amount of heat lost with the flue gases, thus improving boiler efficiency.
## 2. **Maintain and Adjust Burners Regularly**
- **Explanation:**
Properly maintained and tuned burners ensure more thorough mixing of air and fuel, leading to more complete combustion with less excess air required.
- **Benefit:**
This not only increases efficiency but also reduces formation of pollutants like CO due to incomplete combustion.
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# (d) Two Environmental Advantages of Using Bagasse Instead of Coal
Bagasse is the fibrous residue left after extracting juice from sugar cane.
## 1. **Carbon Neutrality**
- **Explanation:**
Bagasse is a renewable biomass. The CO₂ released during its combustion is roughly equal to the amount absorbed by the sugar cane during its growth, making it nearly carbon neutral.
- **Benefit:**
This reduces net greenhouse gas emissions compared to burning coal, which adds new CO₂ to the atmosphere.
## 2. **Reduced Sulphur Emissions**
- **Explanation:**
Bagasse contains very little sulfur compared to coal.
- **Benefit:**
Burning bagasse produces less sulfur dioxide (SO₂), a major cause of acid rain and air pollution.
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## **Final Answers**
**(c) Ways to improve boiler efficiency by reducing excess air:**
1. Use combustion gas analyzers to optimize air supply.
2. Regularly maintain and tune burners for better combustion.
**(d) Environmental advantages of using bagasse:**
1. Bagasse is nearly carbon neutral, reducing greenhouse gas emissions.
2. Bagasse has lower sulfur content, minimizing acid rain–causing emissions.
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