It has been long observed by process and energy technicians that the critical parametric readings (mass flow rate, temp. pressure drop and etc.) in the furnace exit zone of Boilers, from the sensors and transducers placed in that zone are unreliableand in many cases not even available due to nonfunctioning of these sensors/transducers. Coupled to this is the added lacunae due to not measuring other equally critical or even more critical parameters in the furnace zone such as, percent CO, O_2 CO_2,H_2O, SO_2 in flue gas, percent particulate matter in flue gas, sensible heat and radiant load fluctuation. Some of these parameters are measured after the last heat trap or just before the stack. This is a case of measuring too little too late. Idealyall these parameters should be accurately measured at the furnace exit zone itself. Thus giving an accurate picture of furnace performance, hence boiler performance. The reasons fundamentally are: a) All sensors depend to a great extent on correct positioning for optimum (even fundamental) performance. b) The sensors/transducers in the furnace exit zone are not adequately engineered to operate and sustain in the conditions of that zone for significant periods of use.
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