Degradation of heat exchanger materials under biomass co-firing conditions
- Cranfield University, Cranfield (United Kingdom). Energy Technology Centre
Co-firing biomass in conventional pulverised coal fired power stations offers a means to rapidly introduce renewable and CO{sub 2} neutral biomass fuels into the power generation market. This paper reports the results of assessments carried out to evaluate the potential operating conditions of heat exchangers in combustion systems with biomass (wood or straw) and coal co-firing, as well as laboratory corrosion tests that have been carried out to give an initial assessment of potential effects of biomass co-firing. The corrosion tests have been carried out using the deposit recoat method in controlled atmosphere furnaces. A series of 1000 hour tests have been carried out at typical superheater and evaporator metal temperatures using simulated deposit compositions and gaseous environments (selected on the basis of plant experience and potential fuel compositions). Five materials were exposed in these tests: 1Cr steel, T22 steel, X20CrMoV121, TP347HFG and alloy 625. In order to produce statistically valid data on the actual metal loss from the materials, the performance of the materials in these tests was determined from dimensional metrology before and after exposure. For each material, these data have been used to determine the sensitivity of the corrosion damage to changes in the exposure conditions (e.g. deposit composition, gas composition) thereby producing initial models of the corrosion performance of the materials. The corrosion data and model outputs have been compared with data available from power plants operating on coal, straw or wood fuels.
- OSTI ID:
- 21126080
- Journal Information:
- Materials at High Temperatures, Vol. 24, Issue 4; ISSN 0960-3409
- Country of Publication:
- United States
- Language:
- English
Similar Records
Co-firing coal and straw in PF boilers -- Performance impact of straw with emphasis on SCR catalyst for deNOx catalysts
The ELSAM strategy of firing biomass in CFB power plants