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Capture efficiency of coal/biomass co-combustion ash in an electrostatic field
Particuology ( IF 4.1 ) Pub Date : 2018-02-09 , DOI: 10.1016/j.partic.2017.10.006
Jianyi Lu , Lili Fu , Ximei Li , Eric Eddings

Ash samples from corn stalk and coal co-fired at 0%, 5%, 10%, 15%, 20%, and 100% biomass were collected by a 4-stage wire-pipe type electrostatic precipitator (ESP), and the ratio of 14C/12C in ash samples from the 0%, 20%, and 100% co-firing scenarios were measured by an accelerator mass spectrometer. The differential capture efficiency in electrostatic fields for coal ash, coal/biomass co-combustion ash (co-ash), and pure biomass ash was studied separately based on the ratio 14C/12C. Other factors that may influence capture efficiency were analyzed, including microscopic morphology, resistivity, dust density, and particle size distribution. The results indicate that co-ash may be efficiently captured by ESP, while pure biomass ash could not. Co-ash capture was mainly concentrated in the first two electrostatic fields in the lab-scale ESP, and the overall capture efficiency exceeded 90%. Biomass addition decreased the resistivity of co-ash, and enhanced its surface adsorption capacity to form agglomerates, facilitating the capture of co-ash. The capture efficiency of coal ash in co-ash was higher than that of pure coal ash in the first electrostatic field of the ESP. Co-firing biomass can aid the removal of both coal ash and biomass ash when using an ESP.



中文翻译:

在静电场中捕获煤/生物质燃烧灰分的效率

通过四级线管式静电除尘器(ESP)收集了以0%,5%,10%,15%,20%和100%的生物量共烧的玉米秸秆和煤的灰分样品,其比例通过加速器质谱仪测量了0%,20%和100%共烧场景中灰分样品中14 C / 12 C的浓度。基于14 C / 12的比值分别研究了煤灰,煤/生物质共燃灰(co-ash)和纯生物质灰在静电场中的差分捕获效率。C.分析了可能影响捕获效率的其他因素,包括微观形态,电阻率,粉尘密度和粒度分布。结果表明,ESP可以有效地捕集共灰,而纯生物质灰则不能。共灰分捕集主要集中在实验室规模的ESP的前两个静电场中,总捕集效率超过90%。生物质的添加降低了粉煤灰的电阻率,并增强了其表面吸附能力以形成附聚物,从而促进了粉煤灰的捕集。在电除尘器的第一个静电场中,共灰中煤灰的捕集效率要高于纯煤灰。使用ESP时,生物燃料共烧可以帮助去除煤灰和生物灰。

更新日期:2018-02-09
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