Application and Hydration Resistance of SiC Refractories for Water-cooled Wall of Waste Incinerators

doi:10.19691/j.cnki.1004-4493.2022.02.003

China's Refractories ›› 2022, Vol. 31 ›› Issue (2): 12-16.DOI: 10.19691/j.cnki.1004-4493.2022.02.003

Application and Hydration Resistance of SiC Refractories for Water-cooled Wall of Waste Incinerators

LUO Huaming¹, CAI Binli¹, YUAN Zhenqiang², ZUO Genliang³, Zhang Jingzheng⁴, WANG Fengyu¹, LI Jinyu¹, WEI Yingfeng¹, SUN Huochang¹, ZHAN Huasheng¹^,^*()

1 Beijing Jinyu Tongda Refractories Technology Co., Ltd., Beijing 100043, China
2 Shenzhen Energy and Environmental Protection Co., Ltd., Shenzhen 518026, China
3 Beijing Capital Environmental Investment Co., Ltd., Beijing 100028, China
4 China Environmental Protection Group Co., Ltd., Beijing 100044, China

Online:2022-06-15 Published:2022-07-05
Contact: ZHAN Huasheng
About author:Luo Huaming, a senior engineer, obtained his bachelor’s degree from Xi’an University of Architecture and Technology majoring in Materials Science. He is currently the manager of Beijing Jinyu Tongda Refractories Technology Co., Ltd. and the vice president of The Association of China Refractories Industry. He has been engaged in technology research & development, quality management and production management of refractories for a long time. He won the honors of the 22^nd Beijing Excellent Young Engineer in 2014 and the Excellent Chief Engineer of National Cement Enterprises in 2020. He has published 14 academic papers, obtained 10 authorized patents, and presided over or participated in the preparation and revision of 6 standards.

Abstract

Abstract:

According to the dual needs of heat transfer and thermal insulation in incinerators, different parts of the incinerators are designed with refractories of different SiC contents. Water vapor is mainly concentrated in the zones of feeding, drying and combustion, and the main damage factors of SiC refractories include high temperature and hydration. The results of hydration resistance of typical SiC-containing refractories show that the higher the SiC content, the worse the hydration resistance. Si₃N₄-SiC refractories after oxidation treatment have good hydration corrosion resistance, which are appropriate for water-cooled wall of waste incinerators.

Key words: waste incinerators, silicon carbide, hydration resistance, Si₃N₄-SiC refractories

LUO Huaming, CAI Binli, YUAN Zhenqiang, ZUO Genliang, Zhang Jingzheng, WANG Fengyu, LI Jinyu, WEI Yingfeng, SUN Huochang, ZHAN Huasheng. Application and Hydration Resistance of SiC Refractories for Water-cooled Wall of Waste Incinerators[J]. China's Refractories, 2022, 31(2): 12-16.

Figures/Tables 10

Fig. 1 Relationship between thermal conductivity and surface temperature of refractories and slag layer

Fig. 2 Distribution of temperature and H2O(g) in incinerators

Fig. 3 Damage of water-cooled wall of incinerators

Table 1 Chemical composition of SiC-containing refractories /mass%

Sample No.	1^#	2^#	3^#	4^#
Al₂O₃	≥10	≥35	≥45	≥55
SiO₂	≤7	≤10	≤20	≤25
SiC	≥80	≥50	≥30	≥15

Fig. 4 Photos of samples before and after hydration resistance test

Table 2 Hydration resistance results of samples

Sample No.	Mass change /%	Volume change /%	Damage
1^#	5.50	-	Many cracks
2^#	3.57	9.40	A few cracks
3^#	2.53	6.32	Fine cracks
4^#	1.94	2.77	No cracks

Fig. 5 SEM photos of sample 1# after hydration resistance test

Table 3 Hydration resistance results of Si3N4-SiC samples

Sample No.	Mass change /%	Volume change /%
5^#	2.07	2.14
6^#	1.10	0.75

Fig. 6 SEM photos of Si3N4-SiC samples

Fig. 7 XRD patterns of Si3N4-SiC samples

References 11

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Application and Hydration Resistance of SiC Refractories for Water-cooled Wall of Waste Incinerators

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