Role of ZnCl2 in High-Temperature Corrosion in a Bench-Scale Fluidized Bed Firing Simulated Waste Wood Pellets

The development and improvement of the handling of waste wood toward higher economical and environmental standards, such as use to produce heat and electricity, has increased in many countries. Waste wood originates mainly from construction and demolition activities and commercial and industrial sources. However, it is known that waste wood usually contains substantial concentrations of heavy metals, particularly elevated amounts of Zn and Pb. In this paper, the importance of Zn in the corrosion process was investigated. To better understand the fate of Zn and its role and effect on high-temperature corrosion of heat exchanger tubes in waste-wood-fired fluidized-bed boilers, high-temperature corrosion/deposit probe tests have been performed. Corrosion tests were carried out in a 30 kWth bubbling fluidized-bed (BFB) reactor. Tests were performed using pure wood pellets as a reference and wood pellets doped with ∼0.5 wt % ZnCl2. Two steels were selected for the tests: a low-alloy steel (10CrMo9-10) and an a...

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