Effect of semi-continuous water washing on the combustion behaviors of agricultural organic solid waste

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion Pub Date : 2023-03-01 DOI:10.1016/j.crcon.2022.12.003

Xiangxi Wang , Zhenzhong Hu , Jinrong Ma , Linlin Yi , Jian Li , Yanfeng Cheng , Jianfei Ma , Na An , Feng Wang , Xian Li , Junjun Yan , Bo Wei , Yue Li , Guangqian Luo , Hong Yao

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引用次数: 2

Abstract

Combustion of agricultural organic solid waste (AOSW) was an ideal solution for their resource utilization in view of their massive annual production and great potential for reduction of fossil fuel utilization. However, high alkali and alkaline earth metals (AAEMs) content in the feedstock can arose severe fouling and slagging issues and thus prohibiting its vast utilization. In this study, a semi-continuous water washing method was proposed to preliminarily remove AAEMs from agricultural organic solid waste and its effects on the combustion behaviors of washed solid product were investigated. Results showed that the combustion index S were improved to 2.63 × 10^-6, over 68 % of the total ashes were removed from the cotton stalk, and 96.3 %, 89.0 % and 74.7 % of K, Na and Mg were effectively removed, respectively. Moreover, the softening temperature of low temperature ash from the washed sample was as high as 1450 °C, 538 °C higher than the low temperature ash from the original sample; the base acid ratio and fouling index were improved from high slagging and fouling risk (1.7 and 90.8) of the original organic solid waste to low and medium risk (0.4 and 3.5), respectively. All these results signified the contributing effect of proposed semi-continuous water washing method on the combustion of agricultural organic solid waste. In a word, this study provided a promising method for fouling and slagging inhibition during the agricultural organic solid waste combustion.

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半连续水洗对农业有机固体废弃物燃烧行为的影响

由于农业有机固体废弃物的年产生量大，在减少化石燃料利用方面具有很大的潜力，因此农业有机固体废弃物焚烧是其资源化利用的理想解决方案。然而，原料中碱和碱土金属(AAEMs)的高含量会引起严重的结垢和结渣问题，从而阻碍了其广泛利用。本研究提出了半连续水洗法对农业有机固体废弃物中AAEMs进行初步去除，并研究了水洗法对洗涤固体产物燃烧行为的影响。结果表明:燃烧指数S达到2.63 × 10-6，棉秆总灰去除率超过68%，K、Na和Mg的有效去除率分别为96.3%、89.0%和74.7%。水洗后低温灰分软化温度高达1450℃，比原样品低温灰分软化温度高538℃;原有机固体废弃物的高结渣率和结垢风险(1.7和90.8)分别提高到低风险和中风险(0.4和3.5)。以上结果说明了半连续水洗法对农业有机固体废弃物燃烧的促进作用。本研究为农业有机固体废弃物燃烧过程中的阻垢抑渣提供了一种很有前景的方法。

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来源期刊

Carbon Resources Conversion Materials Science-Materials Science (miscellaneous)

CiteScore

9.90

自引率

11.70%

发文量

审稿时长

10 weeks

期刊介绍： Carbon Resources Conversion (CRC) publishes fundamental studies and industrial developments regarding relevant technologies aiming for the clean, efficient, value-added, and low-carbon utilization of carbon-containing resources as fuel for energy and as feedstock for materials or chemicals from, for example, fossil fuels, biomass, syngas, CO2, hydrocarbons, and organic wastes via physical, thermal, chemical, biological, and other technical methods. CRC also publishes scientific and engineering studies on resource characterization and pretreatment, carbon material innovation and production, clean technologies related to carbon resource conversion and utilization, and various process-supporting technologies, including on-line or off-line measurement and monitoring, modeling, simulations focused on safe and efficient process operation and control, and process and equipment optimization.