柴油改性煤的煤泥成型性能和煤泥燃烧特性研究

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Advanced Powder Technology Pub Date : 2024-08-16 DOI:10.1016/j.apt.2024.104619
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引用次数: 0

摘要

本研究利用柴油改性低阶煤(LRC)制备了改性低阶水煤浆(M-LRCWS),并与低阶水煤浆(LRCWS)进行了对比,以研究水煤浆的成浆机理和燃烧特性。同时,采用动力学方法研究了水煤浆的燃烧动力学,以探究燃烧反应机理。结果表明,LRC 的成浆浓度为 70%,而 M-LRCWS 的成浆浓度为 72%,提高了 2%。柴油改性对 CWS 的稳定性有积极影响。相同浆料的综合燃烧特性指标随加热速率的增加而恶化。在相同的加热速率下,M-LRCWS 具有更好的综合燃烧性能、更高的可燃性和更稳定的点火性能。燃烧动力学计算表明,采用 FWO 法,M-LRCWS 的反应活化能为 105.50 kJ/mol,LRCWS 为 99.59 kJ/mol;采用 Starink 法,M-LRCWS 的反应活化能为 93.48 kJ/mol,LRCWS 为 92.68 kJ/mol。M-LRCWS 的活化能略高于 LRCWS,这表明柴油被包裹在煤颗粒中,很难活化该物质。因此,这种分散体系更加稳定,有利于储存和运输。利用 Achar 微分方程和 Coats-Redfern 积分方程计算了 LRCWS 和 M-LRCWS 的物理功能,结果表明 LRCWS 和 M-LRCWS 都遵循三级反应(F3)机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Study on slurry forming performance and slurry combustion characteristics of diesel modified coal

In this study, modified low rank coal water slurry (M-LRCWS) was prepared by using diesel modified low rank coal (LRC) and compared with low LRC water slurry (LRCWS) to investigate the slurry formation mechanism and combustion characteristics of coal water slurry. Meanwhile, the combustion kinetics of coal-water slurry was investigated using kinetic methods to probe the combustion reaction mechanism. The results showed that the slurry formation concentration of LRC was 70 %, while the slurry formation concentration of M-LRCWS was 72 %, which was an increase of 2 %. The diesel modification positively affected the stability of CWS. The comprehensive combustion characteristics index of the same slurry deteriorated with increasing heating rate. At the same heating rate, M-LRCWS has better combined combustion performance, higher flammability and more stable ignition performance. Combustion kinetics calculations showed that the reaction activation energies were 105.50 kJ/mol for M-LRCWS and 99.59 kJ/mol for LRCWS using the FWO method, and 93.48 kJ/mol for M-LRCWS and 92.68 kJ/mol for LRCWS using the Starink method. The activation energy of M-LRCWS is slightly higher than that of LRCWS, which indicates that the diesel fuel is encapsulated in the coal particles and it is difficult to activate the substance. As a result, the dispersion system is more stable and favorable for storage and transportation. The physical functions of LRCWS and M-LRCWS were calculated using the Achar differential equation and the Coats-Redfern integral equation, and the results showed that both LRCWS and M-LRCWS followed the tertiary reaction (F3) mechanism.

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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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