Resistance to sulfur poisoning of hot gas cleaning catalysts for the removal of tar from the pyrolysis of cedar wood

In the partial oxidation of tar derived from the pyrolysis of cedar wood, the effect of H₂S addition was investigated over non-catalyst, steam reforming Ni catalyst, and Rh/CeO₂/SiO₂ using a fluidized bed reactor. In the non-catalytic gasification, the product distribution was not influenced by the presence of H₂S. Steam reforming Ni catalyst was effective for the tar removal without H₂S addition, however, the addition of H₂S deactivated drastically. In contrast, Rh/CeO₂/SiO₂ exhibited higher and more stable activity than the Ni catalyst even under the presence of high concentration of H₂S (280 ppm). On the Ni catalyst, the adsorption of sulfur was observed by XPS and Ni species was oxidized during the partial oxidation of tar. In the case of Rh/CeO₂/SiO₂, the adsorption of sulfur was below the detection limit of XPS. This can be related to the self-cleaning of catalyst surface during the circulation in the fluidized bed reactor for the partial oxidation of tar derived from cedar pyrolysis.     

基于改进卡尔曼滤波的RFID数据清洗方法研究

采用RFID(radio frequency identification)技术在阅读器和动态电子标签之间进行通信,采集到的数据通常存在大量的脏数据。为更好支持高层应用,必须对原始数据进行清洗。针对标签频繁移动这一特点,将滑动窗口技术引入卡尔曼滤波模型,给出了一种改进的卡尔曼滤波模型,进而提出了一种基于改进卡尔曼滤波的RFID数据清洗方法。该方法在保证数据清洗准确率的基础上能有效解决标签动态跃迁带来的时间延迟问题,从而更加适用于标签频繁移动的场景。实验结果表明,该算法提高了清洗效率及准确率。     

良庄煤矿发展煤炭加工与综合利用的有效途径

良庄煤矿在发展煤炭加工与综合利用方面探索了一些有效途径 ,在洗选加工方面采用重介选煤工艺代替跳汰选 ,运行效果良好 ,利用浮选精煤制备水煤浆及燃煤锅炉改烧水煤浆、压滤煤泥发电及矸石制砖等方面均有显著的经济和环保效益     

火电厂输灰系统在线化学清洗用溶垢缓蚀剂的研制和应用

针对火电厂输灰系统在线化学清洗工艺，研制出一种新型溶垢缓蚀剂。在清洗中，这种溶垢缓蚀剂既能促进灰垢的溶解，又能防止电厂输灰系统及其它有关设备的腐蚀。现场应用结果表明，溶垢缓蚀效果良好。     

Low cost coal-based carbons for combined SO2 and NO removal from exhaust gas

The aim of this paper is to show how a cheap carbonaceous material such as low rank coal-based carbon (or char) can be used in the combined SO₂/NO removal from exhaust gas at the linear gas velocity used in commercial systems (0.12 m s⁻¹). Char is produced from carbonization and optionally activated with steam. This char is used in a first step to abate the SO₂ concentration at the following conditions: 100 °C, space velocity of 3600 h⁻¹, 6% O₂, 10% H₂O, 1000 ppmv SO₂, 1000 ppmv NO and N₂ as remainder. In a second step, when the SO₂ concentration in the flue gas is low, NO is reduced to N₂ and steam at the following experimental conditions: 150 °C, space velocity of 900 h⁻¹, 6% O₂, 10% H₂O, 0-500 ppmv SO₂, 1000 ppmv NO, 1000 ppmv NH₃ and N₂ as remainder.It has been shown that the presence of NO has no effect on SO₂ abatement during the first step of combined SO₂/NO removal system and that low SO₂ inlet concentration has a negligible effect on NO reduction in the second step. Moreover, this char can be thermally regenerated after use for various cycles without loss of activity. On the other hand, this regenerated char shows the highest NO removal activity (compared to parent chars, either carbonized or steam activated) which can be attributed to the activating effect of the sulfuric acid formed during the first step of the combined SO₂/NO removal system.     

中国工业清洗行业发展状况

较详细、系统地介绍了我国化学清洗技术、物理清洗技术、生物清洗技术的发展历程及应用情况，阐述了我国工业清洗行业的发展状况，指出了我国工业清洗业面临的问题及对策。     

离心制冷机组冷凝/蒸发系统的化学清洗

针对该厂离心制冷机组冷凝 /蒸发系统严重积垢危及设备安全运行这一现状 ,研究出了一种适宜的清洗方案并成功地应用于现场。为化学清洗技术如何有效地用于制冷行业特殊污垢的处理 ,提供了一个成功的范例     

电脉冲清洗机的介绍与应用

电脉冲清洗机就是基于"液电效应"设计的新型清洗机,是众多清洗方式中的一种,它采用"液电效应"机理,把电能转化为液动力作用于管道内的垢体,使垢体在冲击波的作用下,与管道脱离,达到清垢目的.在垢比较密实,管道较长或弯曲的情况下,采用电脉冲清洗机除垢效果较好.     

MBR工艺处理印染废水中膜的污染和清洗

研究MBR工艺处理印染废水中膜通量的变化，结果表明，膜污染是影响膜通量的重要因素，运行过程中膜通量随时间的延长而降低，仅用14h就衰减了约21％；膜清洗先采用物理方法（空曝气＋反冲洗），再用化学方法，最终可使膜通量恢复至90％以上；使用的两种化学方法中第二种清洗方法使用后膜的运行周期较长，同时运行中还可配合其他方法减缓膜污染。     

高分子材料膜的污染和清洗

就高分子材料膜的污染、清洗及清洗过程的化学反应、清洗剂的选择和定性等问题进行了论述.力图全面而又简捷地对膜清洗做一综述.