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what is the difference between id fans and fd
fans
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Answer Posted / mark chen - maran engineering
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The ID fan serves two functions:
1. Create a negative pressure in the furnace compared to outer pressure. if the furnace has leaks, a positive pressure in the furnace will cause gases to leak out. instead of building an expensive totally leak proof furnace, a cheaper design may be used.
2. increase the flow velocity of furnace gases. After the furnace the flue gases cool, especially when they pass various cleaning processes, so they may not reach the height in the atmosphere where they are distributed, and stay condensed above the plant site and nearby area. a high stack and increased flow velocity help here.
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