Question 69 on Boiler Foundations, October 22: (A certain score will be given to the top 40)
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The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. () Thank you for your support: +6 points for correct answers, +3 points for incorrect answers or after posting 45 messages
The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. (That’s not right, is it?)
Something feels off; I don’t understand boilers, but what matters is participating.
That can’t be right; it feels like it’s the opposite.
Error---------------------------------------------------------
The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. (Correct)
The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. (Correct)
The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. (√)
The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. (For) Counterflow arrangement: large heat transfer temperature difference, good heat transfer efficiency, allows for a reduction in the heated surface area, thus saving metal ； However, the high-temperature section of the steam is located in the high-temperature area of the flue gas, resulting in high wall temperatures that can cause metal overheating, thereby compromising the safety of the superheater. Downstream arrangement: The high-temperature section of the steam is located in the low-temperature area of the flue gas, resulting in lower wall temperatures and thus safer operation ； However, the heat transfer temperature difference is small, resulting in poor heat transfer efficiency; more heating surfaces are required, which leads to greater metal consumption and is therefore uneconomical. Mixed-flow arrangement: The superheater adopts a counter-current arrangement in areas where the flue gas temperature is low, and a co-current arrangement in areas where the flue gas temperature is high. This setup combines the advantages of both co-current and counter-current arrangements; the heat transfer temperature difference is lower than that in the counter-current case but higher than that in the co-current case, making it safe and economical – hence it is widely used.
The outlet section of the superheater is generally arranged in a co-current configuration, with the aim of reducing the metal wall temperature of the heat-exposed surfaces. (Mistake)