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Which one of the following statement is not correct ?In a fluidized-bead boiler
- a)the combustion temperatures are higher than those in the conventional boilers
- b)inferior grade of coal can be used without slogging problems
- c)the formation of NOx is less than that in the conventional boilers
- d)the volumetric heat release rates are higher than those in the conventional boiler
Correct answer is option 'A'. Can you explain this answer?
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Which one of the following statement is not correct ?In a fluidized-be...
**Fluidized-Bed Boiler: Incorrect Statement**
The correct answer is option 'A': the combustion temperatures are higher than those in conventional boilers.
**Explanation:**
A fluidized-bed boiler is a type of boiler that uses a bed of solid particles to suspend and burn fuel. The combustion process in a fluidized-bed boiler is different from that in conventional boilers. Let's examine each statement to understand why option 'A' is incorrect.
**a) The combustion temperatures are higher than those in conventional boilers:**
This statement is incorrect. In a fluidized-bed boiler, the combustion temperatures are lower than those in conventional boilers. This is because the fuel particles are suspended and mixed with the bed of solid particles, which acts as a heat sink and helps in controlling the combustion temperature. The bed of solid particles absorbs and dissipates some of the heat, preventing the combustion temperature from reaching very high levels.
**b) Inferior grade of coal can be used without slogging problems:**
This statement is correct. One of the advantages of a fluidized-bed boiler is its ability to burn a wide range of fuels, including inferior grades of coal. The fluidized bed of solid particles helps to break down and burn the fuel efficiently, even if it contains impurities or has a low calorific value. This eliminates the slogging problems that may occur in conventional boilers when using low-quality coal.
**c) The formation of NOx is less than that in conventional boilers:**
This statement is correct. The combustion process in a fluidized-bed boiler helps to reduce the formation of nitrogen oxides (NOx), which are harmful pollutants. The lower combustion temperatures and the presence of a bed of solid particles help in reducing the formation of NOx by providing the right conditions for fuel combustion without excessive formation of nitrogen compounds.
**d) The volumetric heat release rates are higher than those in conventional boilers:**
This statement is correct. In a fluidized-bed boiler, the combustion process is intensified due to the suspension of fuel particles in the bed of solid particles. This allows for higher volumetric heat release rates, which means that a larger amount of heat is released per unit volume of the combustion chamber. This leads to improved efficiency and higher power output compared to conventional boilers.
In conclusion, option 'A' is the incorrect statement. The combustion temperatures in a fluidized-bed boiler are lower than those in conventional boilers due to the presence of a bed of solid particles that acts as a heat sink.
The correct answer is option 'A': the combustion temperatures are higher than those in conventional boilers.
**Explanation:**
A fluidized-bed boiler is a type of boiler that uses a bed of solid particles to suspend and burn fuel. The combustion process in a fluidized-bed boiler is different from that in conventional boilers. Let's examine each statement to understand why option 'A' is incorrect.
**a) The combustion temperatures are higher than those in conventional boilers:**
This statement is incorrect. In a fluidized-bed boiler, the combustion temperatures are lower than those in conventional boilers. This is because the fuel particles are suspended and mixed with the bed of solid particles, which acts as a heat sink and helps in controlling the combustion temperature. The bed of solid particles absorbs and dissipates some of the heat, preventing the combustion temperature from reaching very high levels.
**b) Inferior grade of coal can be used without slogging problems:**
This statement is correct. One of the advantages of a fluidized-bed boiler is its ability to burn a wide range of fuels, including inferior grades of coal. The fluidized bed of solid particles helps to break down and burn the fuel efficiently, even if it contains impurities or has a low calorific value. This eliminates the slogging problems that may occur in conventional boilers when using low-quality coal.
**c) The formation of NOx is less than that in conventional boilers:**
This statement is correct. The combustion process in a fluidized-bed boiler helps to reduce the formation of nitrogen oxides (NOx), which are harmful pollutants. The lower combustion temperatures and the presence of a bed of solid particles help in reducing the formation of NOx by providing the right conditions for fuel combustion without excessive formation of nitrogen compounds.
**d) The volumetric heat release rates are higher than those in conventional boilers:**
This statement is correct. In a fluidized-bed boiler, the combustion process is intensified due to the suspension of fuel particles in the bed of solid particles. This allows for higher volumetric heat release rates, which means that a larger amount of heat is released per unit volume of the combustion chamber. This leads to improved efficiency and higher power output compared to conventional boilers.
In conclusion, option 'A' is the incorrect statement. The combustion temperatures in a fluidized-bed boiler are lower than those in conventional boilers due to the presence of a bed of solid particles that acts as a heat sink.
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Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer?
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Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer?.
Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following statement is not correct ?In a fluidized-bead boilera)the combustion temperatures are higher than those in the conventional boilersb)inferior grade of coal can be used without slogging problemsc)the formation of NOx is less than that in the conventional boilersd)the volumetric heat release rates are higher than those in the conventional boilerCorrect answer is option 'A'. Can you explain this answer?.
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