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Q: Please define turndown ratio and tell what the advantages are for a higher turn down?
A: Turndown ratio is the ratio of maximum fuel input rate to minimum fuel rate of a variable input burner. Traditionally burners on firetube boilers operate in the 4:1 turndown ratio range depending on fuel and size.
Advantages of high turndown burners include:
Reduction of standby losses
Limiting thermal cycling
Saves wear and tear of burner components
Initial cost and complexity
Requires more maintenance
Limitations of Boiler/burner system
The limitations include fuel/air mixing requirements, material temperature issues, flame shape characteristics, flow control limitations and pressure vessel limitations.
Q: What is an IBR Boiler?
A: "Boiler" means any closed vessel exceeding 22.75 litres (five gallons) in capacity which is used expressly for generating steam under pressure and includes any mounting or other fitting attached to such vessel, which is wholly or partly under pressure when steam is shut off.