Effect of Chlorine on the Degradation of a Carbon Steel in a Coal-Fired Fluidized-Bed Combustor

J Chin Soc Corr Pro

2004, Vol. 24

Issue (4): 193-197 DOI:

Research Report

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Effect of Chlorine on the Degradation of a Carbon Steel in a Coal-Fired Fluidized-Bed Combustor

Xiao Peng

中科院金属所

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Abstract Corrosion of A210-C carbon steel tube has been investigated after 1000h exposure at the place close to the bubbling bed of a bench-scale fluidized-bed combustor during firing a coal of low sulfur and high chlorine. It was foound that a heavily exfoliation of the wastage occurred in locations with the tube surface temperature of 460℃-560℃.The spalled wastage was mainly composed of hematite(Fe2O3) covered by a layer of deposits. (K,Na)Cl was locally detected in the deposits layer. By investigation of the residual wastage on the carbon steel tube,some locations at/near the interface of the wastage and the metal substrate did appear chlorization, which led to three different consequences:(1)formation of FeCl2 layer underneath the eastage,(2)rapid local corrosion,causing protrusions into the metal,(3)appearance of internal pores in the metal. The generation of the different morphologies above and effect of chlorine were both discussed in detail.

Key words: fluidized-bed combustor carbon steel corrosion chlorization

Received: 06 January 2003

ZTFLH:

TG172.3

Corresponding Authors: Xiao Peng

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Xiao Peng. Effect of Chlorine on the Degradation of a Carbon Steel in a Coal-Fired Fluidized-Bed Combustor. J Chin Soc Corr Pro, 2004, 24(4): 193-197 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I4/193

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