Development of Oxygen based online measurement technique for unburnt losses in boiler

The effective boiler performance is determined by the efficiency of the boiler. The efficiency can be calculated by direct & indirect method. Various un-capture boiler losses occurring throughout the operating cycle results in gap between the efficiencies by two mentioned ways. The unburnt loss is one of the un-captured losses in boiler. This loss mainly consists of carbon which provides the energy through combustion. This unburnt carbon passes through the stack as fly ash & through the bottom tray as bottom ash in various forms like hydrocarbons, carbon Monoxide & Solid carbon particles. Offline lab analysis doesn´t provide a real time picture of unburnt carbon produced & are time consuming & costly. It is generally agreed that online measurement of unburnt carbon is an important aspect for boiler monitoring & control. Many efforts are done in this field for developing such technique. We are adopting the method of secondary combustion of flue gas & the DIFFERENCE OF OXYGEN before & after combustion will be scaled into unburnt loss percentage.