Corrosion in ultra supercritical boilers for straw combustion

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Abstract
In order to reduce CO2 emission, ELSAM (the electric utility company of the western part of Denmark) is looking into the possibilities for using biomass—mainly straw—for combustion in high-efficiency power plants. In this connection ELSAM has investigated three ultra supercritical boiler concepts for combustion of straw only or together with coal: (1) pulverized fuel boilers (PF-boilers); (2) circulating fluidized bed boilers (CFB-boilers); and (3) vibrating grate boilers with 100% straw. These investigations have mainly been full-scale tests with straw fed into existing boilers. Corrosion tests have been performed in these boilers using temperature regulated probes and in-plant test tubes in existing superheaters. The corrosion has been determined by detailed measurements of wall thickness reduction and light optical microscopic measurements of the material degradation due to high temperature corrosion. Corrosion mechanisms have been evaluated using SEM/EDX together with thermodynamic considerations based on measurements of the chemical environment of the flue gas.

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