Spontaneous combustion has become a critical limiting factor for the safe and efficient utilization of low rank coals. In this work, the alkali-oxygen oxidation (AOO) of Chinese Shengli lignite ...
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Suppressing the spontaneous combustion of lignite is of great significance for safe transportation and efficient utilization of lignite. Taking the Shengli lignite as the research object, two different macerals, inertinite and huminite, were selected by optical microscope, and treated with NaOH respectively to study the relationship between the structure and …
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Request PDF | Experimental investigation on using ionic liquid to control spontaneous combustion of lignite | Coal spontaneous combustion (CSC) has become a safety topic and has been widely debated.
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Semantic Scholar extracted view of "Experimental investigation on microstructure evolution and spontaneous combustion properties of secondary oxidation of lignite" by Yibo Tang et al.
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1. Introduction. Coal remains one of the most important primary fossil fuels globally, serving as an important energy source in power engineering, metallurgy, chemical industry etc. [1], [2].Unfortunately, coal spontaneous combustion (CSC) frequently occurs in coal mining, storage and transportation processes [3], posing thermal dynamic …
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Lignite has a high content of volatile matter which makes it more convertible into gas and liquid petroleum products than the higher ranking coals. However, its high moisture content and susceptibility to spontaneous combustion may cause problems in …
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Due to the high moisture content of lignite, it is prone to spontaneous combustion and weathering, and the transportation cost is high, which is not conducive to storage and …
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Monitoring of spontaneous combustion at a lignite stockpileSpontaneous combustion of coal causes substantial material damage and endangers the safety of workers both in …
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The pore structure and oxygen-containing functional groups of lignite play an important role in drying behavior, spontaneous combustion characteristics, and other applications of lignite.
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Lignite has characteristics such as high moisture and oxygen contents, and low heating value [1]. These characteristics make lignite inefficient for direct combustion. Moreover, its high spontaneous combustion tendency increases fire risk during storage and transportation [2]. Pyrolysis is considered an effective method to improve the …
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Lignite also tends to disintegrate during combustion, and hence the losses through a grate may be relatively high. It requires special care in storing, is uneconomical to transport over long distances, and is subject to spontaneous combustion.
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Moreover, lignite can be easily oxidized in air during storage and transportation [ 6 ], leading to spontaneous combustion [ 7, 8 ]. The spontaneous combustion of lignite presents industrial safety and environmental concerns [ 9 ].
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The characteristic parameters of the spontaneous combustion of lignite were analyzed by simultaneous thermal analysis-Fourier transform infrared spectroscopy and in situ …
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The increasing demand of lignite in the power sector has led to a renewed interest to study the possibilities of spontaneous combustion behavior. Bulk storage of lignite with …
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A programmed temperature-increase experiment was conducted on coal samples from four coal mines in the Zhalainuoer mining area to improve the accuracy of predicting and forecasting lignite spontaneous combustion. The gases produced during the coal tests were analyzed, and logistic, exponential, Boltzmann, and fourth-degree …
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The spontaneous ignition that occurs with upgraded lignite products is a concern for its storage, handling, and transportation. The Basket testing method and Oxidn.
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liability of spontaneous combustion of this lignite was increased with decreasing particle size, increasing moisture ... coal during storage and transport. It is important to
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However, moisture readsorption properties of the upgraded lignite would partially offset the upgrading effect. ... The moisture readsorption ratio and spontaneous combustion tendency to the upgraded lignites decreased with the increasing temperature, while the influence of asphalt on the moisture readsorption and combustion characteristics …
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The SOx emissions from lignite combustion are a function of the sulfur content of the lignite and the lignite composition (i.e., sulfur content, heating value, and alkali concentration). The conversion of lignite sulfur to SOx is generally inversely proportional to the concentration of alkali constituents in the lignite.
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predicting and forecasting lignite spontaneous combustion. The gases produced during the coal tests were analyzed, and logistic, exponential, Boltzmann, and fourth-degree polynomial functions were selected to develop predictive models for …
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Lignite spontaneous combustion. 1. Introduction. Lignite presents a readily combustible high energy material, and it also tends to result in coal ... and was sealed for transportation. Soon after its arrival at the laboratory, the sample surface was peeled off, and the central part was ground. The samples were shifted to obtain particles with a ...
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Semantic Scholar extracted view of "Experimental investigation on using ionic liquid to control spontaneous combustion of lignite" by Zujin Bai et al.
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The changes in pore structures directly affect the energy transport and mass transport, ... But there is still lack of information about the effect of particle size on lignite spontaneous combustion at the range of diameter larger than 1 mm, while the size of MTE product could exceed 100 mm [27]. The different changes of pore structures …
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ABSTRACT The increasing demand of lignite in the power sector has led to a renewed interest to study the possibilities of spontaneous combustion behavior. Bulk storage of lignite with unknown histories of their proneness to self-ignition phenomena has become a concern in their selection. The present evaluation has been directed to delve …
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Compared with the fuel powder, briquetting can decrease the spontaneous combustion tendency of lignite in storage, long-distance transportation and thermal drying, and also reduce dust pollution [26]. The low-rank coal and other solid wastes briquettes can be used favorably in grate and fluidized bed furnace [27].
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A possible mechanism of the inhibitory effect of NaOH treatment on the spontaneous combustion of lignite is also proposed based on the experimental results. This study provides a way to inhibit the spontaneous combustion of low-rank coals for the safe transportation and efficient utilization of lignite in industry.
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These characteristics make lignite inefficient for direct combustion. Moreover, its high spontaneous combustion tendency increases fire risk during storage and transportation [2]. Pyrolysis is considered an effective method to improve the unfavored characteristics of lignite to combustion.
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Abstract To ensure the safe transportation and efficient utilisation of lignite, it is important to inhibit its spontaneous combustion. In this study, Shengli lignite (SL +) was used as …
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Spontaneous combustion of coal causes serious accidents and economic losses for the storage and transportation of coal. Especially for the lignite coal, it is susceptible to spontaneous combustion due to its low coalification rank [1–3]. As time of exposure to air goes on, the lignite prefers to spontaneous combustion.
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It is important to inhibit the spontaneous combustion of lignite for its safe transportation and efficient utilization. Shengli lignite was treated with a NaOH soln. and the as-prepd. coal samples were extensively characterized by SEM-EDS, x-ray diffraction, FT-IR, XPS, and Raman spectra techniques.
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Using the ReaxFF reactive force field to perform a series of MD simulations, we have studied the initiation reactions for the spontaneous combustion of lignite B using a unimolecular model. The results show that the spontaneous combustion is initiated by hydrogen abstraction from phenolic hydroxyl groups by O 2, leading to the formation of …
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