与传统氢气相比,液氢的能量密度更高,储存压力更低。目前,国外已有采用液氢作为燃料的成功案例。从质量、体积以及储氢密度考虑,车载液氢技术更接近实用化目标要求。美国及欧洲一些国家已开展车载液氢的相关研究,并制定了一些标准。对GT...与传统氢气相比,液氢的能量密度更高,储存压力更低。目前,国外已有采用液氢作为燃料的成功案例。从质量、体积以及储氢密度考虑,车载液氢技术更接近实用化目标要求。美国及欧洲一些国家已开展车载液氢的相关研究,并制定了一些标准。对GTR 13:2013 “Global Technical Regulation on Hydrogen and Fuel Cell Vehicles”、 SAE J2579:2013 “Standard for Fuel Systems in Fuel Cell and Other Hydrogen Vehicles”中规定的液氢储存系统的鉴定设计要求及试验程序进行了比对,可为国内液氢储存系统标准的制定提供参考。展开更多
An investigation was carried out to eliminate the decrease of effluent pH value in carbon filter in O3-biological activated carbon process. The influence factors were examined in a pilot test, and pH was adjusted in t...An investigation was carried out to eliminate the decrease of effluent pH value in carbon filter in O3-biological activated carbon process. The influence factors were examined in a pilot test, and pH was adjusted in the pilot and waterworks. Results show that the carbon filter is an acid-base buffer system and the activated carbon is the key factor. Chemical functional groups on activated carbon surface present acid-base properties to buffer the water but decrease with time, so that effluent pH value decreases. The effects of ozone dosage, CO2 in the carbon filter, and the filter influent quality are negligible. A new method to adjust pH is developed: the activated carbon is first modified by soaking in sodium hydroxide solution to make its pH reach the desired value, and then the pH value of inflow is controlled to certain value by dosing lime in sand filter influent. The method is economical and effective.展开更多
文摘与传统氢气相比,液氢的能量密度更高,储存压力更低。目前,国外已有采用液氢作为燃料的成功案例。从质量、体积以及储氢密度考虑,车载液氢技术更接近实用化目标要求。美国及欧洲一些国家已开展车载液氢的相关研究,并制定了一些标准。对GTR 13:2013 “Global Technical Regulation on Hydrogen and Fuel Cell Vehicles”、 SAE J2579:2013 “Standard for Fuel Systems in Fuel Cell and Other Hydrogen Vehicles”中规定的液氢储存系统的鉴定设计要求及试验程序进行了比对,可为国内液氢储存系统标准的制定提供参考。
基金Supported by the National Water Pollution Control and Harnessing Projects (2009ZX07423-003)
文摘An investigation was carried out to eliminate the decrease of effluent pH value in carbon filter in O3-biological activated carbon process. The influence factors were examined in a pilot test, and pH was adjusted in the pilot and waterworks. Results show that the carbon filter is an acid-base buffer system and the activated carbon is the key factor. Chemical functional groups on activated carbon surface present acid-base properties to buffer the water but decrease with time, so that effluent pH value decreases. The effects of ozone dosage, CO2 in the carbon filter, and the filter influent quality are negligible. A new method to adjust pH is developed: the activated carbon is first modified by soaking in sodium hydroxide solution to make its pH reach the desired value, and then the pH value of inflow is controlled to certain value by dosing lime in sand filter influent. The method is economical and effective.
