生物质电厂灰渣替代水泥掺合料的性能研究

doi:10.19964/j.issn.1006-4990.2023-0008

摘要/Abstract

摘要：

在电力行业减碳的背景下，生物质发电技术已成为电力行业实现“双碳”目标的重要途径之一，然而，生物质电厂灰渣的利用已成为制约生物质电厂发展的瓶颈。生物质电厂灰渣具有一定的火山灰特性，有望成为水泥掺合料而逐渐被利用。分析了生物质电厂灰渣的理化特性，进而分别用10%~30%（质量分数）的生物质灰渣替代硅酸盐水泥熟料制备复合胶凝材料，验证生物质电厂灰渣替代熟料的可行性。实验结果表明，生物质灰渣作为水泥部分掺合料使用具有一定的优异性能，生物质灰渣可替代高达20%（质量分数）的熟料，复合胶凝材料的水化热降低明显，标准养护7 d和28 d后复合材料的强度都有显著提高。生物质灰渣被利用在建筑材料中将进一步实现电力行业“双碳”目标的达成。

关键词: 生物质灰渣, 无机材料, 水泥掺合料, 机械性能, 低碳

Abstract:

Under the proposal of “dual carbon” goal，biomass power plant has become an important way for achieving the dual carbon goal.However，the utilization of biomass power plant ash has become a bottleneck preventing the development of biomass power plants.Biomass power plant ash has pozzolanic properties and it is expected to be used as a substitute cement clinker in building materials industries.The physical and chemical properties of biomass power plant ash were analyzed.Based on the physical and chemical properties，10%~30%（mass fraction） biomass power plant ash were used to replace portland cement clinker to prepare cement-based cementitious materials，and the possibility of biomass power plant ash and slag to replace cement clinker was verified.The test results showed that the use of biomass ash as a cementitious material had good prerequisites.The biomass ash could replace 20%（mass fraction） of cement clinker，the hydration heat of the composite cementitious material could be reduced significant，and the strength of the composite material was significantly improved after standard curing for 7 d and 28 d.The utilization of biomass power plant ash as building materials was expected to further help the realization of the “dual-carbon” goal of the power industry.

Key words: biomass ash, inorganic materials, cement admixture, mechanical properties, low carbon

中图分类号:

X705

张雁茹, 任常在, 宋占龙, 朱建军, 赵保峰, 谢洪璋, 王振江, 祁晓乐. 生物质电厂灰渣替代水泥掺合料的性能研究[J]. 无机盐工业, 2023, 55(10): 128-135.

ZHANG Yanru, REN Changzai, SONG Zhanlong, ZHU Jianjun, ZHAO Baofeng, XIE Hongzhang, WANG Zhenjiang, QI Xiaole. Study on performance of biomass power plant ash as alternative to cement clinker in blended cements[J]. Inorganic Chemicals Industry, 2023, 55(10): 128-135.

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样本	m（熟料）/ g	m（生物质灰渣）/g	m（标准砂）/g	需水量/ g	初凝、终凝时间/min
对照组	450	0	1 350	225	154/225
BFA10	405	45	1 350	225	172/242
BFA20	360	90	1 350	225	187/251
BFA30	315	135	1 350	225	206/278

w（SiO₂）	w（CaO）		w（Al₂O₃）		w（SO₃）		w（Fe₂O₃）		w（K₂O）
45.3	19.9		13.0		4.8		4.6		4.3
w（MgO）		w（P₂O₅）		w（MnO）		w（Na₂O）		w（Cl）
2.7		1.7		2.7		0.8		0.2

样本	体积密度/ （kg·m^-3）	复合胶凝材料密度/（kg·m^-3）	总孔隙率/ %
对照组	2 084±42	2 663±17	22.1±1.1
BFA10	2 051±40	2 655±16	23.7±1.2
BFA20	2 040±38	2 648±15	24.1±1.4
BFA30	2 008±39	2 641±15	26.2±1.8

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