石灰-石膏法在回转窑烟气脱硫中的应用

分析了石灰-石膏法脱硫技术在回转窑烟气处理方面的应用。对不同烟气脱硫技术进行分析比较,认为石灰-石膏湿法脱硫工艺是当前最合适冶炼企业的低浓度SO2烟气脱硫工艺。并结合某湿法炼锌厂回转窑烟气脱硫工程,阐述了该工艺的基本原理和流程,以及该脱硫工程中主要设备的选型和投产后的处理效果。分析了工程实施后产生的环境效益和社会效益,表明该工艺具有技术成熟,运行可靠,成本相对低廉的特点。     

锅炉烟气脱硫技术方案选择

针对锅炉烟气中SO2排放浓度超标的问题,比较了干法脱硫和湿法脱硫技术的优缺点,选择了LS氨法喷雾脱硫技术--以合成氨装置回收的低浓度氨水为吸收剂进行锅炉烟气脱硫,并制得硫酸铵产品.介绍了LS氨法喷雾脱硫技术的工艺流程,针对投运后存在的问题实施了改进措施;粉煤锅炉监测数据表明,烟尘排放浓度和SO2排放量均小于国家允许排放标准,2台锅炉的脱硫效率分别达到94.8%和98.2%.     

用氨-酸法脱除工业烟气中低浓度SO2生产硫酸铵

简述用氨-硫酸法脱除烟气中低浓度SO2,并利用回收的SO2生产硫酸和硫酸铵的工艺过程;介绍利用该工艺技术在国内建成投产的第1套烟气脱硫工业装置的设计和运行概况.推荐将该项技术列为我国今后烟气脱硫的主要工艺技术加以推广.     

新型煤化工硫近零排放技术分析

为了实现新型煤化工硫近零排放,介绍了活性焦燃煤烟气净化与煤气脱硫技术的原理、工艺流程及特点,结合2种工艺特点,以活性焦烟气净化再生产生的富SO2气体和煤气脱硫产生的H2S可反应生成硫磺为工艺技术切入点,提出了一种活性焦烟气净化与煤气硫回收技术有机集成的硫近零排放联合工艺,并进行了硫的物料平衡分析。结果表明,60万t/a煤制烯烃项目采用该联合工艺后,可建立起企业内部硫回收利用的循环经济产业链,煤炭中总的硫资源回收率达到85.69%,新增硫磺产能50%,回收硫磺总量为9 254 t/a,可节水60万t/a,且采用活性焦干法烟气净化技术可将燃煤烟气中SO2与NOx等污染物同时脱除,实现了较好的经济与环保效益。     

镍反射炉烟气脱硫技术分析与应用

分析了目前主要脱硫工艺的优缺点。根据镍反射炉烟气的特性,金川集团选择了活性焦干法烟气脱硫工艺。详细介绍了活性焦干法烟气脱硫工艺的主要组成:烟气系统、SO2吸附脱硫系统、活性焦再生系统、物料循环系统等。项目投产后,各项运行数据均达到设计要求,脱硫效率平均为98.8%,收尘效率平均为76.09%,使低浓度二氧化硫烟气得到了较好治理。     

烟气脱硫脱硝技术研究进展

烟气中的SO2、NOX给大气环境带来严重破坏,因此对烟气进行脱硫脱硝净化是十分必要的。分别介绍了传统的烟气脱硫脱硝技术和近年来发展的脱硫脱硝一体化工艺,说明了它们各自的特点、机理及存在问题。     

面向21世纪的烟气脱硫脱氮一体化工艺

简单而系统地介绍了燃煤烟气中 SO2 和 NOx 的分别脱除技术 ,着重讨论近年来蓬勃发展的烟气脱硫脱氮一体化工艺 ,分析和比较几种一体化工艺的特点 ,并结合我国国情 ,阐述对我国选择烟气脱硫脱氮一体化工艺的看法。     

脱硫石膏在水泥生产中的应用经验

燃煤烟气中的SO2是中国目前最主要的SO2污染来源，而烟气脱硫是直接、有效消减SO2排放量不可替代的技术，是中国防治SO2污染的有效途径。在众多烟气脱硫工艺中，湿式石灰石-石膏法以其稳定、高效等优点成为世界上应用最广泛的脱硫工艺，但是这种工艺会产生大量副产物——脱硫石膏。     

非稳态低浓度二氧化硫冶炼烟气制分析纯硫酸技术应用

针对低浓度非稳态含硫冶炼烟气,采用有机胺可再生脱硫技术将烟气中的SO2脱除,并回收得到高纯度的SO2气体,尾气中ρ(SO2)≤100 mg/m3,达标排放.产出的高纯SO2气体与空气配气后,配套"一转一吸"制酸系统,制备分析纯硫酸.制酸系统分析纯硫酸产出比例为100％,产品质量达到GB/T 625—2007《化学试剂硫...     

烟气干法脱硫技术的发展与应用

介绍了我国SO2 的排放现状及其危害 ;阐述了高能电子活化氧化法等几种烟气干法脱硫技术的原理、工艺特点和应用现状 ,并就烟气干法脱硫技术在我国的发展提出了建议。     

Simultaneous removal of SO2, SO3 and H2SO4 mist from the gas after TiO2 calcining

Absorption of SO₂ and SO₃ in the solutions of waste ferrous sulfate (so-called ‘green salt’) and in the spent acid after TiO₂ hydrolysis, at H₂SO₄ concentrations ranging from 0–5 to 15 g/m³ (STP), was studied. The rate of SO₃ absorption has been found to rise linearly with increasing SO₃ concentration in the gas and to be independent on H₂SO₄ concentration in solution. The SO₂ absorption also rises linearly with increasing SO₂ content in the gas, but diminishes as H₂SO₄ concentration increases—an upper limit of 100 g H₂SO₄/kg H₂O is indicated. The initial concentration of the solution must not be higher than 40 g H₂SO₄/kg H₂O.     

SO2 Oxidation and H2O-H2SO4 Binary Nucleation by Radon Decay

The oxidation of SO₂ by ·OH radical produced by radon decay and binary nucleation of H₂SO₄-H₂O were studied using a thermal diffusion cloud chamber. A kinetic model was developed to examine the oxidation of SO₂ by ·OH to H₂SO₄ to estimate airborne concentration of the critical species. The kinetic modelling calculations suggested that ·OH radical production is the rate control step among the gas-phase reactions proposed. The experimental results showed that nucleation rates increase with increasing radon and SO₂ concentrations. Two distinct types of nucleation, mist and rain, were observed at different super-saturation in the thermal diffusion cloud chamber. The experimental observations suggest that both SO₂ and H₂SO₄ can cause binary nucleation with water vapor. It is necessary to further distinguish between these two nucleation mechanisms in the future in order to obtain a better understanding of this combined oxidation and nucleation mechanism.     

K2SO4-Na2SO4系统相变材料的热物性分析

利用已有的热力学数据,对硫酸钠和硫酸钾相变材料的热力学稳定性、饱和蒸汽压等热物性进行了计算分析,探讨了莫来石作为硫酸盐相变材料基体的可行性.由热力学计算和分析可以看出,硫酸钠和硫酸钾在1100℃的高温下发生分解反应的平衡常数都极小,很难发生分解.硫酸钠即使在1200℃的饱和蒸气压也很低,是一种很有前途的相变材料,同时混合熔盐也表现出了非常低的蒸气压,计算数据和实验的热失重分析相吻合.研究结果表明,通过热物性相关参数的设计计算可以为相变储能材料的实际应用提供依据.     

Modification of SO4 2--ZrO2 and Pt/SO4 2--ZrO2 properties during n-hexane isomerization

The modification of the textural properties and crystalline structure of SO₄ ^2--ZrO₂ and Pt/SO₄ ^2--ZrO₂ during n-hexane reaction at 473 K and 6 kg cm^-2 has been studied in the presence of either hydrogen or nitrogen. Sulfur content before and after reaction and the amount of coke at the end of the reaction were measured. The coke deposited on the catalysts blocks the pores of small size and decreases the surface area of the used catalysts. After regeneration, surface area is not completely restored. The loss of sulfur during reaction, probably associated to the reaction medium, also produces a decrease in surface area by the collapse of the smallest pores which generates larger ones. The transformation of tetragonal to monoclinic crystalline structure of zirconia begins to occur when sulfur content drops below a critical value. This revised version was published online in July 2006 with corrections to the Cover Date.     

SO2-Assisted Simultaneous Reduction of SO2 and NO by CO on SnO2-TiO2 Solid Solution

Sn_0.5Ti_0.5O₂ shows excellent catalytic performance both for the CO-SO₂ reaction and the CO-SO₂-NO reaction. At 350 ° C, 525 ppm SO₂/520 ppm NO/2085 ppm CO, SV = 3000 h^-1, the conversion of SO₂ is nearly complete in the CO-SO₂ reaction and above 89% in the CO-SO₂-NO reaction; NO conversion is above 98% in the latter reaction. The selectivities of S and N₂ are both close to 100%. SO₂ shows a significant promoting effect on the activity of the Sn_0.5Ti_0.5O₂ catalyst for NO reduction by CO. Combining transient response experiments, catalytic tests and TPD results, we propose a SO₂-assisted NO-CO reaction concept. The existence of a surface sulfur species, which was formed during the CO-SO₂ or CO-SO₂-NO reaction, is proved by XPS analysis. It is the active site for NO reduction in the CO-SO₂-NO reaction, and through which SO₂ accomplishes its promoter role. On the basis of the results obtained, the SO₂-assisted redox mechanism of simultaneous reduction of SO₂ and NO by CO is proposed.     

SCR烟气脱硝过程中SO2和SO3的测量

建立了同时测量烟气中SO2和SO3浓度的测量方法．采用三级收集系统对气体中的SO2进行收集,并采用离子色谱仪对吸收液中的SO3^2-和SO4^2-扣进行测量,以确定待测气体中SO2和S03的浓度．该方法测量SO2和SO2的误差分别为1．2％和-29．6％．采用该方法对自行制备的V2O5／WO3／TiO2催化荆催化还原NO和催化氧化SO2的情况进行了研究．实验结果表明,脱硝率和SO2氧化率均随反应温度升高而增加．综合考虑脱硝和SO2氧化问题,最佳的烟气脱硝温度区间为310℃～400℃．烟气中的NH3和NO与SO2在催化剂表面竞争吸附,降低了SO2氧化率．     

用AgNO3-H2SO4溶液代替Ag2SO4-H2SO4溶液测定水质COD值的可行性探讨

研究了用硝酸银代替昂贵的硫酸银作催化剂,在H2SO4介质中,重铬酸钾回流法测定油田污水COD的新方法.通过t检验,验证该方法与标准法的测定结果一致,精密度符合国家监测标准要求.表明AgNO3可代替Ag2SO4作为重铬酸钾回流法的催化剂测定含油污水的COD.