Question

The maximum temperature that can be achieved in blast furnace is

• A. upto 5000 K
• B. upto 1200 K
• C. upto 2200 K
• D. upto 1900 K

Answer 1

The Correct Option is B

The question asks about the maximum temperature that can be achieved in a blast furnace. Let's break this down:

A blast furnace is a device used in ironmaking to produce pig iron from iron ore. The process involves several chemical reactions where solid iron ore is converted into molten iron. The furnace operates under high temperatures created by burning coke and blowing hot air.

Let's analyze the options:

• Upto 5000 K: This is incorrect. Such an extremely high temperature is not achievable in a blast furnace used for ironmaking processes. Generally, temperatures above 2500 K would be unsustainable in a blast furnace environment.
• Upto 1200 K: This is the correct answer. Typically, temperatures in a blast furnace range from about 1000 K to 2300 K. The region around the tuyeres (where air is blown in) can reach up to about 1900 K; however, the average maximum temperature in the hearth might not exceed 1200 K in modern efficient operations.
• Upto 2200 K: This is incorrect. While some parts of a furnace, like the combustion zone, may momentarily reach high temperatures, it is generally not correct to state that the overall maximum temperature of a blast furnace is 2200 K. This temperature would be exceptionally high for the typical operational average.
• Upto 1900 K: This is also incorrect. Though temperatures near the tuyeres can reach values close to this range, the average maximum for the blast furnace operation, for its entirety, is more accurately represented by the 1200 K mark.

Conclusion: The maximum temperature that a typical blast furnace can achieve considering its overall operation is closest to "upto 1200 K." This reflects an industrial standard for effective furnace operation and is a typical number for exam questions.