The final selection of an exhaust fan?
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RT: Parameters: Medium: Flue gas. Design flow rate: 5800–6200 NM3/h. Design temperature: 300°C. Design pressure: 10 Kpa. Question: Regarding the bearings, should they be rolling type? Slide? Let’s discuss the advantages and disadvantages; please share your views on the design of the exhaust fan speed. Is low speed better or high speed better? 1450 rmp or 2980 rmp – please discuss the sealing type for the exhaust fan. Labyrinth? Carbon ring? Or something else? Please discuss the material suitable for the fan impeller. Personally, I recommend 1Cr18Ni9Ti for the stator material; 16Mn for the shaft material. I suggest Q390A, 35crMo, or 42CrMo as well
Bearings: Generally rolling type. Rotational speed: Low, as the flow rate is not high. Sealing: Use a labyrinth seal for high temperatures. Material for the shaft: Use the second option you mentioned. For the impeller, 16Mn is the appropriate choice. I’m not sure what you mean by ‘stator’. Last edited by Chaochao on 2009-4-10 09:59
Sir, I’m not sure if you have considered the impact of 300°C on 16Mn; in my opinion, 16Mn cannot be used at 300°C.