Study on the slurry ability of low-rank coal blended with alkali-modified sludge

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2024-11-23 DOI:10.1016/j.fuel.2024.133771

Xiaofang You , Wenqi Zhang , Xiaoteng Li , Chuandong Ma , Zhisen Li , Qingbiao Wang , Zhenhua Wang , Lin Li

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Abstract

In this study, alkali-modified municipal sludge (AS) was mixed with low-rank coal to prepare AS-coal water slurry (ASCWS). The influence of AS on the slurrying performance of coal water slurry (CWS) was investigated, and the slurrying mechanism of municipal sludge-CWS (SCWS) was elucidated. Research on the alkali modification of municipal sludge showed that the effectiveness of the modifiers was in the order Ca(OH)₂ > NaOH > KOH > K₂CO₃. Considering the apparent viscosity of the slurry as the evaluation criterion, the optimal alkali modification scheme was determined through the response surface optimization test, and 19.99 % Ca(OH)₂ was suitable to modify the sludge for 14.61 h Compared with the unmodified sludge, the content of oxygen-containing functional groups on the surface of AS was reduced, and the flocculent structure was disrupted, which helped improve the slurry formation performance of the SCWS. Blending the sludge with the CWS enhanced the stability of the slurry, and the water separation rates for the SCWS and ASCWS decreased from 18.62 % to 5.00 % and 5.26 %, respectively. The mechanism study showed that the zeta potential values of SCWS and ASCWS decreased from −10.67 mV to –32.23 mV and −39.22 mV, respectively. The increased electronegativity of the slurry owing to the addition of sludge facilitated particle dispersion and enhanced slurry stability. The adsorption patterns of sodium poly[(naphthaleneformaldehyde)sulfonate] (MF) on coal, sludge, and modified sludge were consistent with the Langmuir adsorption model. The pseudo-second-order kinetic model accurately described the adsorption process of MF on coal, sludge, and modified sludge.

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低阶煤与碱改性污泥混合后的制浆能力研究

本研究将碱改性城市污泥（AS）与低阶煤混合制备AS-水煤浆（ASCWS）。研究了 AS 对水煤浆（CWS）成浆性能的影响，并阐明了城市污泥-水煤浆（SCWS）的成浆机理。对城市污泥碱改性的研究表明，改性剂的效果依次为 Ca(OH)2 > NaOH > KOH > K2CO3。以泥浆表观粘度为评价标准，通过响应面优化试验确定了最佳碱改性方案，19.99%的Ca(OH)2适合改性污泥14.61 h 与未改性污泥相比，AS表面含氧官能团含量降低，絮凝结构被破坏，有助于改善SCWS的成浆性能。将污泥与 CWS 混合可提高泥浆的稳定性，SCWS 和 ASCWS 的水分离率分别从 18.62% 降至 5.00% 和 5.26%。机理研究表明，SCWS 和 ASCWS 的 zeta 电位值分别从 -10.67 mV 降至 -32.23 mV 和 -39.22 mV。由于添加了污泥，泥浆的电负性增加，从而促进了颗粒的分散，提高了泥浆的稳定性。聚[（萘甲醛）磺酸钠]（MF）在煤、污泥和改良污泥上的吸附模式与 Langmuir 吸附模型一致。伪二阶动力学模型准确地描述了 MF 在煤炭、污泥和改良污泥上的吸附过程。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.