HCl effect on in-bed tube wastage in bubbling fluidized bed, a laboratory study under simulated dense particle impact conditions
Heat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. There have been some field studies indicating a possible chlorine effect, where coals containing higher chlorine contents caused higher wastage rates. The effect, however, is not understood nor certain due to inconclusive field and laboratory data. The purpose of this paper is to report the results of experiments using the EPRI/LBNL FBC wastage simulator to evaluate the effect of chlorine on in-bed tube wastage. This rig was designed to simulate dense particle impacts on tube bottoms with well-controlled parameters, and has been proven to closely reflect situations found in operating bubbling FBCs. In this study, HCl gas was chosen to be the Cl source and was introduced into the fluidizing air at 50--400 ppm concentrations. Tests were performed at temperatures ranging from the ambient to 400 C using 1018 low carbon steel rods in a bed of commercial SiO{sub 2} sand that had an average size of 800 {micro}m. The wear profile after each test was measured using a profilometer. Results showed a significant increase in material wastage rates in the presence of HCl, and that the rate was greater with higher HCl concentrations, implying a causal relationship. The magnitude of the effect observed appears to be of the same order as that reported in practice.
- Research Organization:
- Lawrence Berkeley National Lab., CA (US)
- Sponsoring Organization:
- US Department of Energy
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 20006797
- Report Number(s):
- CONF-990534--
- Country of Publication:
- United States
- Language:
- English
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