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SCR烟气脱硝过程中SO2和SO3的测量 总被引:1,自引:0,他引:1
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. 相似文献
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介绍了以含SO2废气为原料,经净化用纯碱溶液吸收生产焦亚硫酸钠新工艺,工艺流程先进,经济效益好。 相似文献
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A mathematical model to describe simultaneous sorption of SO2, O2 and H2O in an activated carbon particle is presented in this paper. The competition for active sites of these species is taken into account by a modified Langmuir-type isotherm, which incorporates the competition of the immobile reaction product phase, H2SO4. Simulations of the model are presented in terms of transient micropore filling of reactant species and product H2SO4. The simulation results show that the multicomponent interactions play an important role in the sorption process. Fast diffusing species like O2 and H2O instantaneously adsorb in the micropore volume of the sorbent. In the course of simultaneous adsorption and reaction of all species in the micropore, a rollup phenomenon on the transient behavior of fast diffusing species could occur, i.e. the micropore loading of these gaseous species can overshoot the final equilibrium level. The simulation results of H2SO4 micropore loading are found to agree reasonably well with the experimental data. 相似文献
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INFLUENCE OF PARTICLE SIZE AND STRUCTURAL PROPERTIES OF SORBENTS PREPARED FROM FLY-ASH AND Ca(OH)2 ON THE SO2 REMOVAL ABILITY 总被引:1,自引:0,他引:1
M. J. Renedo J. Fernandez A. Garea J. A. Irabien 《Chemical Engineering Communications》2000,182(1):69-80
Sorbents for SO2 removal from flue gas were prepared by slurring fly ash and Ca(OH)2. Four fractions of different particle sizes were obtained by sieving and by grinding. These fractions were characterised by determining mean diameter values, the BET specific surface area and the pore size distribution and tested in the desulfurization reaction for 5 and 60 minutes at low temperature in order to relate the particle size and structural properties of the sorbents to the desulfurization ability. Fractions obtained by sieving showed similar BET specific surface area values and pore size distribution to each other. The conversion values at both reaction times were higher for fractions with the smaller particle size. Fractions obtained by grinding exhibited different structural properties depending on the reduction procedure. These fractions with smaller mean particle sizes than those obtained by sieving, showed smaller conversion values. Results indicated that the influence of the particle size is showed only for sorbents with similar pore size distribution. A quantitative relationship between pore filling (due to the calcium sulfate formed) and conversion values has not been found. 相似文献
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热煤气一体化净化工艺中的脱硫反应特征 总被引:1,自引:0,他引:1
利用固定床反应器考察了高温煤气脱硫除尘一体化净化工艺中沉积粉尘对高温煤气脱硫剂脱硫性能的影响.结果表明,表面沉积粉尘对脱硫剂初次硫化行为有明显的影响,且与脱硫剂的组成和结构有关.利用钢厂赤泥制备的脱硫剂,含有多种惰性杂质,且具有较大的孔径结构,易于和粗煤气中的粉尘作用,造成脱硫剂硫容的减小.硫化气氛中,H2O的存在造成脱硫剂硫容和脱硫效率的降低,但不会影响因表面沉积粉尘造成的脱硫剂硫容的减小.多次硫化-再生循环实验表明,硫化-再生循环过程有助于减小表面沉积粉尘对脱硫剂脱硫行为的影响.经历一定次数的硫化-再生循环后,粉尘对脱硫剂脱硫行为的影响逐渐消失. 相似文献
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分别采用液体驯化和气相驯化法,从不同的采样点筛选培育出4种烟气脱硫细菌,为了解其生长、繁殖的规律,对其生理特性进行了研究.结果表明,所筛选的烟气脱硫细菌在酸性条件下对二氧化硫有较强的脱除能力,培养12 d后,其脱硫效率还在50%以上;在恒温条件下,用721分光光度计对其生长曲线进行了测定,从各菌株的生长曲线可以看出,培养8 h后各菌株基本进入对数期,40 h左右菌液浓度达到峰值,各菌株都经历了适应期、对数生长期、稳定期、衰亡期4个时期;从形态特征可以看出,大部分菌株为短杆菌.由实验可得出结论:所筛选的烟气脱硫细菌对烟气中的二氧化硫具有一定的脱除效果,所测定的菌株生长曲线和对菌株形态特征的研究结果可作为选定工业化条件的参考. 相似文献
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有机溶剂吸收法脱除烟气中二氧化硫的研究 总被引:3,自引:0,他引:3
与传统脱硫方法相比,有机溶剂吸收法具有投资费用低、操作简单、效率高和可反复利用等特点,为使其尽快用于工业生产,在实验室研究的基础上,对筛选的烟气吸收剂进行了扩大实验,对液气比、气速、温度和气体组成等对脱硫效果的影响进行了探讨,并对吸收剂的再生情况进行了研究.实验结果表明,所筛选吸收剂对二氧化硫有很强的吸收效果,对二氧化碳有很好的选择性,证明了所筛选吸收剂的可行性. 相似文献
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V2O5 supported activated coke (V/AC) was shown to be a good catalyst for SO2 removal from flue gas. In this work, the heterogeneities of cylindrical V/AC granules (Φ 8.5 · 12.6 mm) are investigated by peeling the granules layer by layer. The results show that the axial ends of the catalyst with a depth of ca. 2 mm contain more pores than other parts of the catalyst. This pore structure distribution results in a similar V2O5 distribution through impregnation and a similar S distribution after SO2 removal. The results show that mass transfer is the main factor affecting SO2 removal over large V/AC granules, and that SO2 removal proceeds mainly along the axial direction of the granules. The granule should be made shorter in the axial direction and longer in the radial direction to improve utilization of V/AC. 相似文献
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中国石化集团宁波工程有限公司在某甲醇装置中应用了新的技术和设备,装置技术水平得到提升,介绍对烟道气二氧化碳回收单元所做的技术改进。 相似文献
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针对化工行业二氧化硫废气浓度高,间歇排放的特点,提出了活性炭吸附脱除S02的方法。考察了废气相对湿度、温度、气速、活性炭炭层高度、预处理温度对S02脱除率的影响,结果表明,在相对湿度为20%,炭层高度为60cm,温度25℃,气速0.3m/s,活性炭预处理温度600℃时,脱除率可以达到97.2%。 相似文献
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SO2在球状活性炭上的吸附转化研究 总被引:8,自引:1,他引:8
研究了不同比表面积的沥青基球状活性炭(PSAC)在O2和H2O存在下脱除SO2的能力.结果表明,比表面积较大的PSAC具有较强的脱除SO2能力.在本实验条件下,三种不同比表面积的PSAC对SO2及SO2+O2的吸附量无明显区别,但对H2O的吸附量随比表面积增大而增大,与样品的脱硫活性随比表面积增大的变化规律相一致,表明较多的水有利于SO2的脱除.这可归因于水既有利于样品活性部位上的SOx转化成H2SO4,又能洗脱所生成的H2SO4,减少活性位上的H2SO4量,使SO2的吸附转化过程连续不断地进行 相似文献
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德国从1980年起,逐渐建立、健全了较为严格的环保标准和法规,且逐步采取了一系列切实可行的环保措施,以控制二氧化硫等燃煤污染物的排放。到1988年已经取得了可喜的成果,运行中的大型燃煤设备均增设了比较完善的环保设施,且烟气中二氧化硫等污染物的排放浓度实现了连续检测和计算机数据管理,从而使燃煤二氧化硫排放得到了有效控制,大气环境质量得到了明显改善 相似文献