Root Cause Analysis (RCA): Fired boiler-induced draft fan (IDF) failures upset all plants operations.
Article Type: | Root Cause Analysis (RCA) |
Category: | Mechanical |
Equipment Type: | Miscellaneous Rotating Machine Problems |
Author: | S. Raghava Chari |
Note: This root cause analysis (RCA) is from real-time scenarios that happened in industries during the tenure of two or three decades ago. These articles will help you to improve your troubleshooting skills and knowledge.
The fired boiler induced draft fan (IDF) failures posed 10-yearlong problems are:
Problem 1 Root Cause Analysis Queries (Q) and Answers (A) are:
Q: Why too low AFB lives?
A: The Antifriction bearings (AFB) situates in the hot flue gas path (below figure); maybe excessive temp fails the AFB.
Q: Why excessive AFB temp; surely the makers would have taken care for it to work in the high temp environs
A: Our guessed reasons are
Problem 1 Root Cause Analyzed Solution:
Mulling this information 2-days, the author developed the below-given solutions:
Run ¼” SS pipe from AFB grease port extending 150‑mm out of duct wall to pump grease and another for the exiting old grease. Monthly pump in new grease till all old grease is out. Leave the exit grease pipe partially open to let the hot grease out when the fan runs.
Problem 2 RCA queries and answers:
Q: Why poor furnace pressure control?
A: We don’t know Sir”.
The author guessed possible errors in the shop-made fan labeled vendor part No. F 1250. The measured dia was 1210 mm only. Possibly the shop duplicating it from an old rotor committed the error.
The author found a local vendor – he fabricates the rotor for the fan manufacturer – furnished correct size and balanced to standards rotors on his ‘hard suspension’ balancing machines exhausted rated flue gas quantities. Now the furnace pressure is near 0 mm WC with 75% guide vanes open.
Both problems vanished
RCA solution Benefits are:
Author: S. Raghava Chari
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