陶瓷烧成中SOx的排放及降低SOx的方法

本文分析了陶瓷烧成过程中S0x的主要来源以及降低SOx排放的方法。同时，还简要介绍了目前主要的几种SOx排放处理方法．并对减少我国陶瓷窑炉燃烧带来的污染提出几点建议。     

FCC硫转移助剂的失活研究

评价了再生时间、循环次数、水热老化以及重金属污染对FCC硫转移助剂脱硫活性的影响。结果表明:随着再生时间的延长,硫转移助剂的活性增加,10 min之后达到稳定;随着反应再生次数的增加,脱硫活性逐渐降低,四个循环之后达到稳定;水热老化使助剂的脱硫活性降低了约40%;Ni会造成脱硫活性的降低,Ca对脱硫活性没有影响,V和Fe能够提高助剂的脱硫活性。     

煤粉燃烧污染物排放特性的试验研究

由煤燃烧产生的NOx、SOx引起的污染受到世界各国的重视,降低污染物排放成为燃烧研究的重要课题.选择了某电厂常用的4种褐煤和3种烟煤,研究了单煤及其混煤的污染物排放特性.结果表明:氧浓度增加时,或煤粉较细时,NOx的排放增加;而水分能降低NOx的排放;SOx的排放规律不明显.     

SOx污染控制技术的现状与发展

阐述了SOx生成机理、S02污染控制技术的分类以及其国内外发展现状。突出介绍了几种典型S02污染控制技术的发展，如湿式石灰石烟气脱硫(FGD)技术、新型半干式FGD技术、工业型煤固硫技术的新方向—生物质型煤、活性炭脱硫脱硝技术以及脉冲放电法脱硫脱硝技术。依据分析给出了一些建议。     

奥里油在电厂中的应用概况及其SOx的控制技术

介绍了奥里油组成、物理特性及其在电厂中的应用情况,并对国外奥里油电站锅炉SO掊的排放状况以及采取的控制技术和经验作了概述。通过对国外奥里油电站采取的SO掊控制技术的分析、综合和比较,提出了目前我们应该开展的研究重点和方向,从而为奥里油燃烧脱硫技术的采用和改进提供参考。     

Environmental Problems Related to Refractories——Some Discussions Based on Historical Surveys mainly in Japan

1IntroductionThe significance of refractory-related environmen-tal problems are drawing a serious attention in the re-fractories industry and their markets worldwide.Thoserefractory-related problems,however,have been han-dled so far separately on a case-by-case basis.It willbe,therefore,of great help for future progress to havea bird’s-eye viewover these issues from historical andtechnological viewpoints.It has been the author’s attitude toward environ-mental problems that they should be dis…     

STUDY ON COMBUSTION CHARACTERISTICS OF BLENDED COALS

由于国内电厂大量燃用混煤,因此,从技术经济角度出发,对混煤燃烧特性进行研究具有很大的必要性.文中利用一个具有在线烟气成分分析的640MJ/h热试验台,进行了几种混煤的燃尽、结渣和污染特性试验.焦炭和渣的比例被引入以区分煤的结渣特性.NOx的释放没有特别明显的规律,但研究中发现几种低硫煤混合后,SOx释放有所减少.     

Environmental catalysis

Catalysis plays a major worldwide role in improving our atmosphere and reducing pollution. Through the next decade, catalysis will continue to provide attractive means to remove undesirable pollutants. This review provides a summary of examples of where catalysis is used to improve our environment as well as new and emerging catalytic solutions. Over twelve major types of pollutants are discussed with a focus on commercially applied processes using catalysis as a solution. In addition, a number of specific catalysis opportunities are discussed.     

Performances of SOx traps derived from Cu/Al hydrotalcite for the protection of NOx traps from the deactivation by sulphur

The behavior of Cu/Al mixed oxides (Cu/Al ratio in the 1:2–1:5 range) have been studied as novel, noble-metal free SO_x traps to protect NO_x traps from the deactivation by sulphur. The investigation was made both in a thermobalance apparatus and in a flow reactor, the latter simulating the reaction conditions and space-velocities of exhaust gases from lean-burn or diesel engines. The analysis of the SO₂ uptake curves as a function of the Cu/Al ratio and reaction temperature indicates that the reaction mechanism of SO₂ uptake depends on two reversible surface processes (the chemisorption of SO₂ and its oxidation by copper ions) and a nearly irreversible process (bulk diffusion of the sulphate species). The rate of these processes depends on (i) the Cu/Al ratio and nature of the surface copper species, (ii) the surface area of the catalyst, (iii) the reaction conditions, and (iv) the degree of sulphation. The SO_x traps showing the best performances in thermogravimetric tests were found also to show the best behavior in flow reactor tests, confirming the validity of thermogravimetric tests, notwithstanding the different composition of the feed used. The SO_x trap having a Cu/Al ratio of 1:2 shows better performances with respect to a reference “state-of-the-art” SO_x trap containing 2% Pt.     

氧化镁对铜铈催化剂CO氧化活性及抗硫性能影响

研究了氧化镁改性载体对铜铈复合氧化物催化剂的CO氧化活性、抗硫性能及烧焦助燃活性的影响。结果表明,以氧化铝为载体的铜铈复合氧化物催化剂具有较高的CO氧化活性,但抗硫中毒的性能稍差;用氧化镁对载体进行改性处理,不仅可以提高催化剂的CO氧化活性,当氧化镁改性剂用量达到20％(质量分数)以上,载体中出现了MgO结构碎片的晶相峰之后,还可明显提高其抗硫中毒的能力,以及硫中毒后氢气还原气氛中的还原再生能力。使催化剂进行烧焦助燃时表现出良好的烧焦助燃活性。