Based on the second derivative of the oxygen concentration, a novel method was proposed to determine the critical and cracking temperatures of coal during low …
different coal types Yanpeng Chen1, Zhenyong Yin2,3, Fenjin Sun1, Hao Xu2,3, Jingjie Wu2,3 and Fangliang Fu2,3 Abstract Coal pyrolysis is the basis of coal gasification, as it is the necessary reaction step in the coal con-version process. To study the pyrolysis characteristics of different coal grades under temperature,
In order to set up the quantitative relationship between the specific surface area increased and the CO production value during the coal crushing process, and explain the influence law of the low temperature oxidation occurred from coal after the coal crushed to the CO production value.A full closed type coal sample crushing test instrument, gas …
The CSC propensity has been proofed to increase with decreasing coal rank in general. Tang [69] observed that the low-rank lignite was oxidized to produce CO at 25 • C, while the high-rank ...
Li et al. believed that the coal crushing process could enhance the oxidation reactivity of coal and then increase risks of coal spontaneous combustion disasters, ... When the particle size was smaller than 0.074 mm, it began to increase rapidly. For the Range N g of the five temperatures, the fluctuation of Coal 1# (low rank) was small, ...
The CO production observed by scholars during mechanical crushing of coal at room temperature and in an inert environment is good evidence for this chemical ... Study on the influence of the mechanical crushing process on low-temperature oxidation characteristics of coal samples. Combust Sci Technol (2022), …
Case study on the application of low-temperature plasma integration technology for the treatment mercury-containing waste gas from the crushing process of waste fluorescent lamps. Feng Qinzhong 1,2, Chen ... Liu R., Zhao J. et al. 2020 Current situation and prospect of mercury removal technology from bituminous coal flue gas …
Coal pyrolysis is the basis of coal gasification, as it is the necessary reaction step in the coal conversion process. To study the pyrolysis characteristics of different coal grades under temperature, thermal simulation tests of three different ranks of coal were conducted, and the pore structure and gas products were analyzed by using liquid …
In this paper, the morphological changes of organic sulfur in coal during low-temperature oxidation were studied first, and then the changes of organic sulfur forms in coal before and after low ...
DOI: 10.1016/J.JLP.2015.08.007 Corpus ID: 110923960; Sources of underground CO: Crushing and ambient temperature oxidation of coal @article{Tang2015SourcesOU, title={Sources of underground CO: Crushing and ambient temperature oxidation of coal}, author={Yibo Tang}, journal={Journal of Loss Prevention in The Process Industries}, …
By thermogravimetry (TG) experiments, evolution behaviors and properties of thermal oxidation processes at low temperature of a bituminous coal with five …
Carbon dioxide (CO2) is widely used in the prevention and control of spontaneous coal combustion. In this manuscript, three low-rank coals with different metamorphic degrees were selected as the research objects. The temperature-programmed experiments, in situ infrared cooling experiments, simulation of the …
These oxygen-containing functional groups can accelerate the low-temperature oxidation process of coal in the subsequent secondary low-temperature …
Aiming at the problem that the coal seam temperature is high and the gas desorption rate is fast, the gas content loss is estimated to be biased, resulting in inaccurate measurement of coal seam gas content. This paper proposes a method for taking the coal samples at low temperature (below 0 °C) in order to improve the accuracy of gas …
Shenmu (SM) subbituminous coal without caking property was treated by low-temperature rapid pyrolysis (LTRP) to modify its caking and coking properties. The treated samples were characterized by Fourier transform infrared spectrometry, vitrinite reflectance, and X-ray diffraction to determine the modification mechanism. Moreover, …
It was observed that low temperature coal oxidation constitutes the major factor responsible for the self-heating of coal as well as an important source of gas emissions. ... In goaf zones where the crushing of coal occurs and the coal surface area exposed to the mine atmosphere sharply increases resulting in intensive gas desorption, …
Based on the second derivative of the oxygen concentration, a novel method was proposed to determine the critical and cracking temperatures of coal during low …
Accordingly, the HGI values of coal samples may be used to optimize the crushing of coal as a preliminary to coke production. ... The Low Temperature Oxidation of Iron. Article.
The low temperature oxidization and high temperature combustion behaviors of raw coal and modified coal samples were studied with programmed …
3.5. Stage Characteristics of Carbon Oxide at Low-Temperature Oxidation of Coal. By summarizing the experimental and simulation results above, we come up with the characteristics of generating carbon oxide at low-temperature oxidation stages of coal, as shown in Figure 8. We divide low-temperature oxidation of coal into four steps.
The effects of low temperature gradient on dynamic mechanical properties of coal were examined through Split-Hopkinson …
And Indian coal, with its high ash content, ignites at a relatively low temperature, 122 degrees Fahrenheit. Coal seams burning at night in the state's Jharia coal region set off a ghostly, vermillion glow, releasing toxins including carbon dioxide, nitrogen oxides and volatile metals such as mercury. ... He says the crushing directly at …
The crushing of generated CO is inversely proportional to moisture content in coal. •. CO production via ambient temperature oxidation is influenced by temperature, particle size and ventilation rate etc. •. Coal with rich aliphatic hydrocarbons and O …
Based on the method of opening closed pores through step-by-step crushing, this study investigated the pore structure of thermally-treated bituminous coal during crushing using low-field nuclear ...
It is important to have an in-depth understanding of the relationship between coal functional group and mass changes during low-temperature oxidation.
So far, DME has been produced from a variety of feedstock including natural gas, crude oil, residual oil, coal, and waste products in the industry [22]. 5) Low extraction temperature and energy consumption. Almost all the current liquefied DME extraction processes are performed at low or room temperatures, which greatly reduces the …
Underground mining is usually simplified as a process of coal crushing and pulverization. However, this process is not purely physical. ... In comparison, its impact on the low-temperature endothermic and burnout stages was weak and exhibited no clear regularity. (2) Mechanical energy input resulted in lower temperatures for ignition, peak ...
Additionally, with the aid of a self-built experimental system for coal oxidation, the low-temperature oxidation of crushed coal of different particle sizes was studied, …
Four Jurassic coal samples from Yima were selected, and experiments on low-temperature oxidation of coal with different oxygen concentrations ranging from 6% to 21% were conducted to determine the ...