半焦负载Na-Fe催化还原NO的研究

在石英固定床反应器上于常压下研究了煤焦负载Na或Fe催化还原NO的反应，同时研究了Na-Fe复合催化剂的催化特性。研究结果表明：Na或Fe催化剂的催化行为差异较大，低温下Na的催化活性高于相同负载量的Fe，而温度较高时，二者的催化活性顺序与低温时相反。Na的催化活性随负载量的增加而迅速增大，而Fe的催化活性随温度的升高增加迅速。在保持相同的负载量下，一定配比的Na－Fe复合催化剂的催化活性高于其中任何单一催化剂的催化活性。在不加其他还原剂的条件下，负载于煤焦上的Na-Fe复合催化剂可有效地催化还原NO，得到了高的还原转化率。复合催化剂高的催化活性预示Na-Fe在制备过程中的相互作用以及催化半焦还原NO的反应中具有协同作用。     

Geochemical Characteristics of the Acid Mine Drainage in the Water System in the Vicinity of the Dogye Coal Mine in Korea

This study investigated geochemical characteristics of the acid mine drainage (AMD) discharged from the abandoned mine adits in the vicinity of the Dogye coal mine in Korea. Acid mine drainage discharged from Jeoncha pit adit of the Dogye coal mine, which is the main source of the AMD in the study area, had a pH value of 3.0 and concentrations of 2148mg SO₄ ^2– L^–1, 229mg Fe L^–1, 71mg A1 L^–1 and 11mg Mn L^–1. The reduction of some metal concentrations downstream from the discharge point could be explained on the basis of dilution and precipitation. The order of removal of metal ions downstream from the discharge point was Fe>A1, Cu>Zn, Mn. Acidity could be used as a good determining factor offering comprehensive and quantitative values for the polluting extent of acid mine drainage. The acidities existing in all acidic water samples in the Gunahan district originated primarily from mineral acidity, especially in the upper Nahan Creek from dissolved Fe and Al and in the middle and down Nahan Creek from dissolved Al. From the application of the WATEQ4F program, it was determined that predominant species of dissolved Fe in all water samples was Fe²⁺, and those of dissolved Al were AlSO₄ ⁺ and Al³⁺ except for IW2 sample which was associated with white precipitates. The species of dissolved Al in IW2 sample include also AlOH²⁺ and Al(OH)₂ ⁺. The saturation indices of goethite and haematite were positive in the water samples associated with ochrous precipitates (usually called Yellow Boy), therefore these solids might be precipitated. For the IW2 sample, the saturation indices of amorphous Al(OH)₃ and gibbsite were positive, so theoretically these solids might also be precipitated. By XRD analysis, it was found that goethite occurs in ochrous precipitates, and gibbsite in white precipitates.     

Low-temperature oxidation of coal at elevated pressures

A mathematical model is presented to describe steady-state mass transfer and oxidation processes in coal at low temperatures in a fixed-bed flow reactor. The model incorporates the effects of partial pressure of oxygen, temperature and coal particle size, and accounts for the rate of coal oxidation and the composition of oxygenated products at high pressures. This is an important development since previous models did not include the effect of pressure in their formulation. It is found that, when the partial pressure of oxygen increases the rate of oxygen consumption increases accordingly. However, the influence of partial pressure of oxygen on the rate of oxidation is less pronounced when the pressure surpasses 1 MPa. In addition the model predicts that, for a constant partial pressure of oxygen, higher rates of oxygen consumption occur at lower total pressures. The same trends are also found for the concentration of oxygenated products at the reactor outlet. It is suggested that, the variation of partial pressure of oxygen leads to different concentration levels of oxygen at the surface and within the pores of coal particles, substantially affecting the rate of oxidation.     

“三软”煤层综放工作面综合防尘技术试验研究

以典型工作面为例研究了煤体注水、自动喷雾、磁化水喷雾、化学防尘等综合防尘技术在“三软”煤层综采放顶煤工作面的实施方法,并对应用中遇到的一些理论问题进行了探讨     

煤矿自燃火灾治理关键技术的研究与应用

介绍了使用同位素测氡法探测煤矿自燃火源位置的原理及应用效果。实践证明,该方法是解决煤矿自燃火灾治理难题的关键技术,由于投资少,精度高,软件处理直观可靠,它有重要推广价值     

煤层注水降低综采工作面煤尘浓度的研究

在深入研究官地矿９＃ 煤渗透特性的基础上,提出动压预注水的煤层注水方案与参数,并在官地矿进行了工业性试验,取得了降低综采工作面煤尘浓度６０％ 以上的明显效果。它对我国煤矿有效实施煤层注水、降低工作面粉尘浓度具有实际指导意义     

雷管空中爆炸压力分布的理论计算

在对８＃ 雷管装药进行简化处理的基础上,其空中爆炸一定范围内的压力场分布可通过理论计算求得。近场参数可用自相似方法求解,而非近场参数又可用ＭａｃＣｏｒｍ ａｃｋ 两步格式对偏微分方程进行数值求解。将获得的压力场与实测结果进行比较,两者基本一致     

高温煤气脱硫剂研究进展

系统地介绍了国外高温煤气脱硫剂的研究开发现状,指出我国重点研究开发铁系、锰系、锌系、铜系和钙系脱硫剂。     

中小型燃煤陶瓷窑炉烟气治理技术

介绍了一种针对中小型燃煤陶瓷窑炉烟气的治理方案。该方案通过采用自成型型煤作燃料，多管旋风除尘器和湍流塔消烟除尘，采用双碱法及往吸收液中加入活性剂等措施，除去烟气中的粉尘，SOx,NOx等，进而达标排放。     

锅炉型煤质量的影响因素分析

分析了配煤组分、成型工艺条件、型料粒度等方面对工业型煤质量的影响，指标合理确定惰性组分含量、成型水分和型料粒度组成是型煤生产的关键，并对实际生产提供帮助。