Combustion Control on Boiler Plant LaserGas III_1
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Application Note All Rights Reserved, Copyright © November 2016, NEO Monitors AS Combustion Control on Boiler Plant - LaserGas™ III Fine control of the Combustion process becomes increasingly possible as gas analysis technology continues to become more sophisticated while at the same time cost effective and reliable. Optimizing combustion control not only saves fuels but can help minimize harmful emissions of both acid and greenhouse gases and may often minimise cleaning of heat exchange surfaces. THE COMBUSTION PROCESS The key to good combustion is simultaneous multicomponent stack gas measurement to enable optimum air: fuel ratio control. Maximum efficiency is achieved with minimum excess oxygen consistent with minimum unburned or partially burned hydrocarbons, usually best indicated by carbon monoxide, CO. This ensures that the energy produced by the combustion process is not wasted in heating unnecessary air while all the fuel is completely combusted. Oxygen and carbon monoxide are used as the primary indicators of the situation; the O2 level where CO starts to increase significantly from a background level usually of a few ppm (Figure 1) is the most efficient control point The NEO Monitors LaserGas™ III SP CO Combustion and LaserGas™ III SP O2 enables multicomponent analysis in a compact solution, giving extra capability with simplified lower cost of installation and support. Not only CO and O2 but also CH4, H2O and temperature measurement are available. Figure 1: Combustion Optimisation by Stack Gas Analysis NEO Monitors as • A subsidiary of Norsk Elektro Optikk • Prost Stabels vei 22 • N-2019 Skedsmokorset, Norway Phone +47 67 97 47 00 • www.neo

MOTIVATION • Optimum Fuel efficiency -CO levels may be read down to 1 ppm LDL • Minimisation of NOx levels due to O2 minimisation More than 30 years’ experience as the originators of cross stack laser measurement have enabled NEO monitors to add features to the measurement which minimise the need to calibrate and concerns with line lock and collisional broadening. • Cleaner Heat exchange surfaces • Minimisation of Greenhouse Gases • High Sensitivity • Operational safety where methane measurement may be used to identify start up issues in gas fired boilers • Water measurement may be used to...