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Which one of the following statements is not correct? In a fluidized-bedboiler?
- a)The combustion temperatures are higher than those in the conventional boilers
- b)Inferior grade of coal can be used without slagging problems
- c)The formation of NO, is less than that in the conventional boilers
- d)The volumetric heat release rates are higher than those in the conventionalboilers
Correct answer is option 'A'. Can you explain this answer?
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Which one of the following statements is not correct? In a fluidized-b...
Fluidized bed combustion has emerged as a viable alternative and has significant advantages over conventional firing system and offers multiple benefits – compact boiler design, fuel flexibility, higher combustion efficiency and reduced emission of noxious pollutants such as SOx and NOx. The temperature of about 870oC is reasonably constant throughout the process because of the high turbulence and circulation of solids. The low combustion temperature also results in minimal NOx formation.
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Which one of the following statements is not correct? In a fluidized-b...
Statement: The combustion temperatures are higher than those in the conventional boilers.
Correct answer: Option 'A'
Explanation:
Fluidized-bed boilers are a type of boiler in which the combustion process occurs in a fluidized bed of material, usually sand or limestone particles. The combustion process in fluidized-bed boilers differs from conventional boilers in several ways.
Higher combustion temperatures in fluidized-bed boilers:
- In fluidized-bed boilers, the combustion temperatures are lower than those in conventional boilers. This is because the fluidized bed provides better temperature control and prevents the formation of hotspots.
- The lower combustion temperatures in fluidized-bed boilers help to reduce the formation of nitrogen oxides (NOx), which are harmful pollutants.
Inferior grade of coal without slagging problems:
- One of the advantages of fluidized-bed boilers is that they can use an inferior grade of coal without slagging problems.
- The fluidized bed of material in the boiler helps to agitate and mix the fuel particles, preventing the formation of slag.
Formation of NOx:
- The formation of nitrogen oxides (NOx) is lower in fluidized-bed boilers compared to conventional boilers.
- The fluidized bed provides better temperature control, reducing the peak flame temperature and minimizing the formation of NOx.
Volumetric heat release rates:
- The volumetric heat release rates in fluidized-bed boilers are higher than those in conventional boilers.
- The fluidized bed allows for better mixing of the fuel and air, resulting in more efficient combustion and higher heat release rates.
Conclusion:
Based on the above explanations, it can be concluded that statement a) "The combustion temperatures are higher than those in the conventional boilers" is not correct for fluidized-bed boilers.
Correct answer: Option 'A'
Explanation:
Fluidized-bed boilers are a type of boiler in which the combustion process occurs in a fluidized bed of material, usually sand or limestone particles. The combustion process in fluidized-bed boilers differs from conventional boilers in several ways.
Higher combustion temperatures in fluidized-bed boilers:
- In fluidized-bed boilers, the combustion temperatures are lower than those in conventional boilers. This is because the fluidized bed provides better temperature control and prevents the formation of hotspots.
- The lower combustion temperatures in fluidized-bed boilers help to reduce the formation of nitrogen oxides (NOx), which are harmful pollutants.
Inferior grade of coal without slagging problems:
- One of the advantages of fluidized-bed boilers is that they can use an inferior grade of coal without slagging problems.
- The fluidized bed of material in the boiler helps to agitate and mix the fuel particles, preventing the formation of slag.
Formation of NOx:
- The formation of nitrogen oxides (NOx) is lower in fluidized-bed boilers compared to conventional boilers.
- The fluidized bed provides better temperature control, reducing the peak flame temperature and minimizing the formation of NOx.
Volumetric heat release rates:
- The volumetric heat release rates in fluidized-bed boilers are higher than those in conventional boilers.
- The fluidized bed allows for better mixing of the fuel and air, resulting in more efficient combustion and higher heat release rates.
Conclusion:
Based on the above explanations, it can be concluded that statement a) "The combustion temperatures are higher than those in the conventional boilers" is not correct for fluidized-bed boilers.
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Which one of the following statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect answer is option 'A'. Can you explain this answer?
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Which one of the following statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect 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 statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect 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 statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect answer is option 'A'. Can you explain this answer?.
Which one of the following statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect 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 statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect 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 statements is not correct? In a fluidized-bedboiler?a)The combustion temperatures are higher than those in the conventional boilersb)Inferior grade of coal can be used without slagging problemsc)The formation of NO, is less than that in the conventional boilersd)The volumetric heat release rates are higher than those in the conventionalboilersCorrect answer is option 'A'. Can you explain this answer?.
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