As run boiler performance assessment for energy efficiency
AS RUN BOILER PERFORMANCE ASSESSMENT FOR ENERGY EFFICIENCY D PAWAN KUMAR
Useful reference standards British standard, BS845: 1987 This describes the methods and conditions under which a boiler should be tested. Boiler should be operated under steady load conditions (generally full load) for a period of one hour before taking reading ASME Standard: PTC-4-1 _Power Test Code for Steam Generating Units Part One: Direct method (also called as Input -output method) Part Two: Indirect method (also called as Heat loss method) IS 8753: Indian Standard for Boiler Efficiency Testing All standards do not include blow down as a loss in the efficiency determination process.
INSTRUMENTS REQUIRED: Flue gas analysers Portable temperature indicator On-line instruments of boiler control room. Facilities of the chemistry lab or outside lab for coal / ash / water analysis. (coal proximate or ultimate analysis, un-burnt in bottom and fly ash, TDS, pH of feed water / blow-down / condensate. Power analyser for power measurement of ID fan, FD fan, ESP, crushers, BFP (boiler feed water pump) cool handling plant/ash handling plant, etc.
The illustrative data collected is for a boiler using coal as fuel. Assessing the as run boiler efficiency by indirect method .
Summary of As run heat balance for Coal Fired Boiler
<ul><li>Good Practices in Boiler selection and O&M for energy efficiency: </li></ul><ul><li>Fuel shift </li></ul><ul><li>Drivers – cost, availability & CDM </li></ul><ul><li>Technology shift to Fluidized bed combustion boilers </li></ul><ul><li>Drivers – compatibility with low grade and agro fuels, and cost economy and CDM </li></ul><ul><li>Adopting Burners with oxygen trim systems for excess air control </li></ul><ul><li>Surface blow down control with blow down heat recovery systems </li></ul><ul><li>Adopting boiler house automation for draft & level control, for efficient operation </li></ul><ul><li>Optimizing Waste heat recovery (economizers and air pre-heaters) </li></ul><ul><li>Adopting Saturated steam turbines </li></ul><ul><li>Variable speed drives adoption for Boiler feed water pumps, FD/ID fans for capacity control </li></ul><ul><li>Adopting Steam accumulators where feasible </li></ul><ul><li>Good use of Energy Audit instruments </li></ul>