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351.
基于神经网络的煤与瓦斯突出预测模型 总被引:8,自引:1,他引:7
吴强 《中国安全科学学报》2001,11(4):69-72
在全面分析了煤与瓦斯突出影响因素的基础上 ,提出了煤与瓦斯突出预测的人工神经网络模型。介绍了突出特征指标的选取及表示方法与推理过程。实例分析表明 ,模型精度很高 ,可用于工作面煤与瓦斯突出预测 ,并分别给出图 2 ,表 3,文献 5 相似文献
352.
353.
重金属化学活性评估方法准确性质疑--以煤矸石样品为例 总被引:5,自引:0,他引:5
重金属元素化学活性的大小是决定它们环境行为最主要的因素之一,我们曾分别用总量法,实验模拟法,环境地球化学法和化学形态分析法对煤矸石样品所含的重金属元素进行过环境影响分析,试图了解自然风化条件下这些有害元素潜在的生态环境效应,结果发现重金属元素的化学活性除了与它们在样品中含量的高低,赋存状态和化学形态等因素有关外,更主要地是取决于样品基质的组成和结构,由于大量有机质的络合和风化过程中生成的铁的胶体的吸附,从煤矸石释放出的重金属元素的化学活性受到明显限制,它们对环境的污染可能仅限于煤矸石堆周围有限的范围。 相似文献
354.
为确定瑞安矿煤堆自燃的环境风速,提高煤堆自燃的预判能力,使用COMSOL Multiphysics 5.0数值仿真软件,开展了5个不同尺寸分别在孔隙率0.2~0.6和环境风速0.05 m/s~13 m/s条件下堆放180 d的自热-自燃过程数值模拟。结果表明,煤堆自燃风速范围因孔隙率和堆放参数不同而异,孔隙率越小煤堆的自燃风速范围越宽,且最小、最易、最大自燃风速与孔隙率之间具有幂函数关系;影响煤堆最小、最易、最大自燃风速显著的参数分别为顶宽、底宽、高度、角度和孔隙率、孔隙率、高度和孔隙率,并构建了三个自燃风速的合理解算方程。 相似文献
355.
Tongyao Ju Siyu Han Fanzhi Meng Li Lin Jinglin Li Kailun Chen Jianguo Jiang 《Frontiers of Environmental Science & Engineering》2023,17(9):112
356.
Coal fly ash (CFA) is dumped at a deep sea disposal site (1,500m water depth) in the eastern Mediterranean, ca. 70km off the Israeli shore. Since 1989, about one million tons of CFA were dumped at the 200km2 allocated area. Six years of monitoring at the dump-site shows that the CFA is heterogeneously distributed; there are areas where CFA covers about 1.3cm depth of the sea floor while at others no CFA is found. CFA is present as a fine powder, small aggregates and even as large blocks both in the dump-site as well as at its peripheries. Cadmium, copper and zinc concentrations in the CFA decreased as a result of the prolonged contact with sea water at in situ conditions while inconclusive changes in mercury, iron and manganese were detected. No changes were observed for lead, iron and aluminium concentrations. A controlled long term field experiment, now in progress at the site, is expected to clarify further chemical changes occurring in the CFA. 相似文献
357.
The effect of oxygen-enriched air during fluidized bed co-gasification of a mixture of coal, plastics and wood has been investigated. The main components of the obtained syngas were measured by means of on-line analyzers and a gas chromatograph while those of the condensate phase were off-line analysed by means of a gas chromatography-mass spectrometer (GC-MS). The characterization of condensate phase as well as that of the water used as scrubbing medium completed the performed diagnostics. The experimental results were further elaborated in order to provide material and substances flow analyses inside the plant boundaries. These analyses allowed to obtain the main substance distribution between solid, gaseous and condensate phases and to estimate the conversion efficiency of carbon and hydrogen but also to easily visualise the waste streams produced by the process. The process performance was then evaluated on the basis of parameters related to the conversion efficiency of fuels into valuable products (i.e. by considering tar and particulate as process losses) as well as those related to the energy recovery. 相似文献
358.
针对河北省某厂的燃煤锅炉的烟管腐蚀问题,通过水质分析、采集腐蚀处的产物,进行XRD、扫描电镜、能谱分析等手段分析腐蚀产生原因和腐蚀速率的影响因素.发现烟管与水接触侧发生了氧腐蚀.水垢附着速率、溶解氧含量这两种因素对腐蚀速率影响较大.并针对锅炉材质、锅炉设计、水质处理、停炉保养、人员素质等方面提出改进措施,为今后处理类似问题提供经验和参考. 相似文献
359.
Coal mining and the resource community cycle: A longitudinal assessment of the social impacts of the Coppabella coal mine 总被引:3,自引:0,他引:3
Two social impact assessment (SIA) studies of Central Queensland's Coppabella coal mine were undertaken in 2002–2003 and 2006–2007. As ex post studies of actual change, these provide a reference point for predictive assessments of proposed resource extraction projects at other sites, while the longitudinal element added by the second study illustrates how impacts associated with one mine may vary over time due to changing economic and social conditions. It was found that the traditional coupling of local economic vitality and community development to the life cycle of resource projects—the resource community cycle—was mediated by labour recruitment and social infrastructure policies that reduced the emphasis on localised employment and investment strategies, and by the cumulative impacts of multiple mining projects within relative proximity to each other. The resource community cycle was accelerated and local communities forced to consider ways of attracting secondary investment and/or alternative industries early in the operational life of the Coppabella mine in order to secure significant economic benefits and to guard against the erosion of social capital and the ability to cope with future downturns in the mining sector. 相似文献
360.
水煤浆技术应用现状及对策分析 总被引:1,自引:0,他引:1
文章对水煤浆技术在工业化应用过程中出现的技术问题进行了分析并提出了相应的对策。 相似文献