Statistical appraisal of intrinsic factors affecting spontaneous combustion of coal

1987 ◽  
Vol 4 (2) ◽  
pp. 155-165 ◽  
Author(s):  
R.N. Singh ◽  
S. Demirbilek
2018 ◽  
Vol 36 (9-10) ◽  
pp. 1744-1754 ◽  
Author(s):  
Fei Gao ◽  
Cun-Bao Deng ◽  
Xue-Feng Wang ◽  
Xue-Ming Li ◽  
Feng-Wei Dai

We propose an experimental adsorption device, imitating the environment of a coal-mine goaf and the composition of the flue gas in Tashan Mine Power Plant. The characteristics of the coal adsorbing flue gas were studied with the atmospheric volumetric method. The factors affecting the seal of CO2 were analyzed and the effect of power plant flue gas on fire prevention in the goaf was investigated at normal temperature and pressure. It can be inferred from the experiment that N2, SO2, and H2O can also reduce CO2 adsorption capacity. The increase or decrease in pH can increase the adsorption capacity of CO2, which is apparently larger when the pH is decreasing than when the pH is increasing. The O2 adsorption capacity can evidently be reduced when the power plant flue gas is injected into the goaf. The activation energy of coal burned in air is greater than that of coal burned in flue gas, indicating that the use of power plant flue gas, with N2 and CO2 as the main components, to replace the traditional inert gas can not only save N2 generation cost, but also reduce the emission of greenhouse gases, while the power plant flue gas can be adsorbed by coal.


BMC Surgery ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Weigang Gan ◽  
Ning Xiao ◽  
Yiyuan Feng ◽  
Danmei Zhou ◽  
Juanjuan Hu ◽  
...  

Abstract Background Tracheobronchial foreign body aspiration (TFBA) is a critical disease in children and is extremely dangerous, even life-threatening. The factors affecting the occurrence and prognosis of TFBA are complex. The purpose of this study is to examine the external and intrinsic factors affecting clinical features of TFBA in West China and propose potential effective intervention measures. Methods We retrospectively analyzed the clinical data of pediatric patients diagnosed with TFBA with foreign bodies (FBs) removed by rigid bronchoscopy under general anesthesia at the otolaryngology department from December 2017 to November 2018. The data included age, sex, clinical symptoms, type and location of FB, guardians, prehospital duration and residence of these pediatric patients. Results The ratio of males (72) to females (53) was 1.4:1. Children aged from 1 to 3 years accounted for 76% (95/125) of patients. Cough, continuous fever and dyspnea were the primary symptoms. The right primary bronchus was the most common location of FB detection by rigid bronchoscopy (67 cases, 53.6%). Organic FBs were most common in our study. Guardians of patients significantly differed in the rural (parents 16, grandparents 31) and urban (parents 52, grandparents 26) groups (χ2 = 12.583, p = 0.000). More children in the rural group than in the urban group had a treatment delay longer than 72 h. More children in the group with no history of FB aspiration (12, 25%) than in the group with prior FB aspiration had a treatment delay longer than 72 h. Conclusion Pediatric TFBA is a common emergency in otolaryngology. Age, sex, tracheobronchial anatomy and other physiological elements were defined as intrinsic factors, while guardians, residence, FB species and prehospital time were defined as external factors of TFBA. External and intrinsic factors both influence the occurrence and progression of TFBA. It is extremely important to take effective measures to control external factors, which can decrease morbidity and mortality.


Fuel ◽  
2022 ◽  
Vol 310 ◽  
pp. 122240
Author(s):  
Zhian Huang ◽  
Sainan Quan ◽  
Xiangming Hu ◽  
Yinghua Zhang ◽  
Yukun Gao ◽  
...  

2018 ◽  
Vol 160 ◽  
pp. 562-567 ◽  
Author(s):  
Marcos L.S. Oliveira ◽  
Kátia da Boit ◽  
Fernanda Pacheco ◽  
Elba C. Teixeira ◽  
Ismael L. Schneider ◽  
...  

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