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Energy Conservation Tips : Tip of the Week 7/9/2010
Energy Conservation Tips : Tip of the Week 7/9/2010Flue gas temperatures depend on steam temperature, excess air and heat transfer efficiency. Monitoring this parameter gives a good indication of the boiler operating conditions.
Accurate control of the amount of air is essential to boiler efficiency:
• Too much air will cool the furnace, and carry away useful heat.
• Too little air and combustion will be incomplete, unburned fuel will be carried over and dark smoke is produced.
High flue gas temperature indicates a solution where there is excess of air. By rule of thumb, the maximum acceptable stack gas temperature is 30o
C over the steam temperature.
C deviation from optimum flue gas temperatures increases the fuel consumption by 1%. By monitoring the stack temperatures, it is possible to identify anomalies if any in the boiler operation.
The high flue gas temperature may point towards one of the following anomalies: