Potash Erosion Resistance of Chromium-Containing Materials

Abstract:

Compared with the traditional entrained flow gasifier, coal catalytic gasifier has the advantages of low reaction temperature, high production efficiency and low energy consumption, but it also has higher requirements for potash erosion resistance. Chromium-containing material is commonly used as lining material for gasification furnaces. In this paper, potash erosion resistance of chromium-containing raw materials and products were respectively researched by using powder tabletting sintering and potassium vapor erosion method. The potash erosion resistance are characterized by XRD and SEM. The study show that:(1)There are obvious potassium salt deposition on the surface of chromium-containing raw materials and products after potash erosion experiment. Potash reacts with chrome-corundum and magnesium-chrome spinel to form K₂CrO₄,and reacts with chromium oxide to form K₂Cr₂O₇ at 750°C. (2)Potassium vapor enters into chromium-containing products through pores and leads to crack formation and volume change, which destroy the structure and reduce high temperature volume stability of material.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 144-149
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.144
• Online since: August 2018
• Authors: Qiong Luo, Hua Zhi Gu*, Ao Huang, Mei Jie Zhang
• Keywords: Chromic Oxide, Chromium-Containing Materials, Potash Erosion Resistance

References

[1] M Gao, Y Wang, Li Fan, Research progress in calcium catalytic action during coal gasification, Chemical Industry & Engineering Progress. 9 (2015).

[2] A. Sharm, T.I. Takanohash, I. Satio, Effect of catalyst addition on gasification reactivity of hyper coal and coal with steam at 775-700°C, Fuel. 87 (2008) 2686-2690.

DOI: 10.1016/j.fuel.2008.03.010

[3] Ding Chen, Ao Huang, Huazhi Gu, et al, Corrosion of Al2O3–Cr2O3 refractory lining for high-temperature solid waste incinerator, Ceramics International. 41 (2015) 14748–14753.

DOI: 10.1016/j.ceramint.2015.07.202

[4] J. Kwang, K. Sakanishi, I. Salto, High yield methane production by steam gasification of hyper coal with potassium carbonate:comparison with raw coal, Energy Fuels. 19 (2005) 2114-2120.

DOI: 10.1021/ef040089k

[5] F.M. Chen, X.J. Wang, X.M. Wang, et al, Transformation of potassium during catalytic gasification of coal and the effect on gasification, Journal of Fuel Chemistry and Technology. 41 (2013) 265-270.

[6] Y. Gong, Q. Zhang, H.W. Zhu, et al, Refractory failure in entrained-flow gasifier: Vision-based macrostructure investigation in a bench-scale OMB gasifier, Applied Energy. 205 (2017).

DOI: 10.1016/j.apenergy.2017.08.095

[7] Markus Carlborg, Fredrik Weiland, Charlie Ma, et al, Exposure of refractory materials during high-temperature gasification of a woody biomass and peat mixture woody biomass and peat mixture, Journal of the European Ceramic Society. 38 (2018).

DOI: 10.1016/j.jeurceramsoc.2017.09.016

[8] J. Xie, H.Z. Gu, H. Duan, et al, Anti-alkali corrosion properties of different refractory raw materials, Journal of Wuhan University of Science and Technology. 37 (2014) 428-431.

[9] B. Ren, Y.W.Li, S.B. Sang, et al, Lightweight design of bauxite-SiC composite refractories as the lining of rotary cement kiln using alternative fuels, Ceramics International. 43 (2017) 11048–11057.

DOI: 10.1016/j.ceramint.2017.05.148