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某项目采用离子液循环吸收脱硫技术处理冶炼系统的环集烟气,烟气处理最大量为320 000 Nm~3/h。工艺利用离子液的化学吸收特性,低温吸收尾气中的SO_2,再高温将SO_2解吸出来,得到99%以上纯度的SO_2气体,且处理后尾气中SO_2≤100 mg/Nm~3。 相似文献
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主要阐述利用工业硫酸吸收废酸处理尾气中的NO、NO2气体。从而配制用于分析一硝的亚硝基硫酸标准溶液,并与现行企标Q/HCFSF-1997《标准溶液制备与标定》中采用纯铜还原法制取氧化氮气体配制的亚硝基硫酸溶液的方法做了对照,确定了利用废酸处理尾气配制亚硝基硫酸溶液方法的可行性。可代替现行纯铜还原法配制亚硝基硫酸标液。从而可以大量节约所消耗的水、电、试剂等成本。同时还可以消除用纯铜还原法制取的氧化氮对人体造成的危害。 相似文献
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︸一一硒化铝Al:S。:亚硒酸钱(NH4):SeO。硒化二砷AS:Se三硒化二韧Bi:Se3硒化镐Cdse硒化钙Case硒酸铜CuseO;一硒化铜Cuse硒化锢Inse硒酸钾K:Seo;制备硒化氢,研究中的半导体材料。制备红色玻璃,作为生物碱的试剂。制造玻璃。研究中的半导体材料。二硫化硒SeS:六氟化硒SeF6一硫化硒SeS二氧化硒SeO:硒酸钠Na:SeO4亚硒酸钠Na:SeO3光电导体、半导体、光电管、整流器、黄磷。电子发射体。使铜或铜合金着黑。基耶达(Kjeldahl)浸提用的催化剂,半导体。研究中的半导体材料。试齐l}。医治狗猫的湿疹与菌类感染用作抗头皮屑的洗发剂,通常… 相似文献
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高硫碳酸锰矿与软锰矿直接浸出实验 总被引:1,自引:0,他引:1
传统电解锰生产中,软锰矿需要经过还原焙烧将其中的Mn4+还原为Mn2+才能被稀硫酸浸出制得MnSO4溶液。利用高硫碳酸锰矿中的硫铁矿成份和浸出时产生的具有还原性的H2S和溶液中的Fe2+,可以直接浸出软锰矿中的Mn4+。经过多次实验对比,总结出了较理想的高硫碳酸锰矿与软锰矿的配矿比,既有利于高硫碳酸锰矿在浸出时产生的H2S的利用吸收,减少尾气中的H2S,给尾气处理减轻负担,又有利于保持较高的浸出率,可为高硫碳酸锰矿和软锰矿的直接浸出提供参考。 相似文献
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The absorptive properties of Baralyme and Sodasorb for CO2 in a container were studied by measuring the lifetime T0.5 of the unit, i.e., the time until the exit concentration of CO2 reaches 0.5%. The container size, the inlet gas flow rate, and the inlet CO2 concentration were varied. The experiments were repeated with either He, N2, or SF6 as the inert gas to evaluate the effect of increased gas density due to hyperbaric conditions on scrubber performance. It was found that T0.5 is best described by an exponential function of the type b (ttr)a, where ttr is the transit time of the gas through the container. The exponent a equals about 1.5 and varies relatively little. The constant b, however, is strongly dependent on inert gas density and on CO2 concentration in the inlet gas; it is independent of container size and gas flow rate. In addition, the amount of absorber reaching up to time T0.5 was measured in all conditions. It is strongly dependent on CO2 concentration; however, surprisingly it is nearly independent of inert gas properties. These results are compared with a mathematical model of scrubber behavior that is based on the chemical reaction rate of an imaginary absorber. The model neglects possible effects of CO2 diffusion in the gas phase, of ash formation, and of heat produced by the reaction. Differences between our experimental data and the model are analyzed as a function of these effects. The results give some simple predictive equations for the lifetime and the amount of absorber reacting. 相似文献
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高炉烟气进行碳捕集可有效降低高炉工序的碳排放。采用化学吸收的方式进行高炉烟气碳捕集,对几种主要吸收剂进行高炉烟气碳捕集能力研究。通过自主搭建的模拟碳捕集试验装置,研究氨水、乙醇胺(MEA)等吸收剂对20% CO2含量的高炉烟气的碳捕集情况,分析其碳捕集能力与再生再利用能力。结果表明,氨水的碳捕集能力最强,每千克溶液捕集CO2可达105.4 L,比捕集量最少的MEA溶液高出了71.38%。此外,各吸收剂CO2的解吸率可达92%以上,仅MEA解吸率为68.94%。重复利用的吸收剂碳捕集能力也达原先的90%以上。同时研究发现,高炉烟气中除尘灰会使有机胺吸收剂在升温解吸过程中降解,使碳捕集能力降低20%左右。本文可为后续开发适宜高炉工序的吸收剂与高炉碳捕集工艺奠定理论基础。 相似文献
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CuInSe2(CIS),Cu(In,Ga)Se2(CIGS)半导体材料具有出色的光伏性能、丰富的缺陷物理内涵以及制备上的挑战,20多年来一直受到太阳能电池界和材料物理界的极大关注。介绍了CIS/CIGS基黄铜矿系光伏材料的微结构、缺陷物理模型。阐明了缺陷类型与材料电学性能的关系:Cu空位Vcu是P型材料中的主要受主,Se空位Vse是n型材料中的主要施主;以及Na元素的作用:优化膜的形貌、提高膜的导电率、还能减小缺陷的浓度。综述了两种常用制备方法(蒸镀法、溅射法)的研究进展。 相似文献
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宝钢2#COREX投产后各技术经济指标持续改善,竖炉金属化率稳定在85%以上,冷煤气中H2含量比1#COREX高出2个百分点,但竖炉炉顶煤气中H2含量相差很小。基于COREX工艺过程中H2含量变化的理论解析,分析了氢元素的守恒、海绵铁金属化率、拱顶温度和竖炉还原对H2含量的影响。研究结果表明,冷煤气中H2含量的增加主要由竖炉海绵铁金属化率的提高所致,且随着竖炉金属化率的提高,气化炉运行更稳定,料柱温度升高,气化炉用氧分配趋向合理等冶炼特征发生改变。 相似文献
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以石油焦为气化原料,基于Aspen plus模拟软件建立了石油焦-空气水蒸气气化制备氨气合成气模型,在验证模型的基础上,进行了气化过程的模拟仿真计算,分析了不同条件下(气化温度、气化压强、ER、S/PC)对气化气体体积分数、合成气(H_2+N_2)产率、φ(H_2)/φ(N_2)的影响.结果表明:升高温度或者增大压强都会使氢气的体积分数降低,低温低压适合制取氨气合成气;增大ER会使φ(H_2)/φ(N_2)比值下降,同时合成气的产率会提高;增大S/PC会使φ(H_2)/φ(N_2)比值上升,合成气的产率也会提高. 相似文献
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为了提高邯钢高炉喷吹煤比,模拟煤粉在高炉内的热解。以邯钢喷吹用长治煤(以下简称CL)和大湾煤(以下简称DW)为原料,采用等离子体进行快速热解,计算反应后煤粉的分解率,利用气相色谱仪对气体产物进行分析以及用扫描电镜(SEM)观察反应产物的形貌特征。试验结果表明,CL和DW的分解率分别为43.10%和52.04%,气相产物主要为CO、H2、CH4、C2H2及少量C2H4等气体,热解产物的粒径减小,形貌发生明显变化。在CL煤的基础上配加不同比例的DW后,煤粉颗粒出现了孔状结构,因此可以提高炉内风口回旋区固定碳颗粒的燃烧率,为提高煤粉燃烧率提供理论依据。 相似文献
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应用Fluent软件对密相干塔模拟仿真,研究了烟气整流系统和链式搅拌器对烟气流场和湍流、循环灰轨迹及系统压力损失的影响,并在模拟工况下确定了烟气整流系统较优导流板布置形式.研究结果表明,链式搅拌器能够显著增大塔内附近区域的湍动能,提高转速不能明显提高整体烟气湍流强度,双层链式搅拌器可以增大高湍流强度区且减缓其衰减速度,该工况下安装双层链式搅拌器,转速为100 r·min-1较为理想,此时密相干塔能够实现烟气均布和气固充分接触,大部分颗粒参与内循环,少部分进入除尘器,系统压损约为200 Pa. 相似文献
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Selenium (Se)-dependent and -independent glutathione (GSH) peroxidases detoxify H2O2 and lipid hydroperoxides, which may mediate the teratogenicity of phenytoin and related xenobiotics. To test this hypothesis, CD-1 mice were placed on Se-deficient diets for 15, 25 or 40 days and bred so that the day of analysis corresponded to gestational day 11. In Se-replete control animals, embryonic peroxidase activities were only 5% of activities in maternal liver (P < .05). After 15 days of Se deprivation, maternal activities for H2O2 (reflecting Se-dependent peroxidase) and cumene hydroperoxide (CmOOH) (reflecting both Se-dependent and -independent peroxidases) were reduced to 20% (P < .05) and 35% of controls, respectively. At this time, the incidence of fetal cleft palates initiated by phenytoin (55 mg/kg intraperitoneally on gestational days 11, 12 and 13) was doubled, from 12% to 25% (P < .05). Selenite rescue (Na2SeO3, 350 micrograms/kg intraperitoneally on day 9) restored maternal and embryonic peroxidase activities and completely inhibited phenytoin-initiated postpartum lethality and fetal resorptions in animals that had been Se depleted for 15 days. After 40 days of Se deprivation, maternal and embryonic peroxidase/H2O2 activities were reduced to < 1% and 27% of Se-replete controls, respectively. In contrast, maternal peroxidase/CmOOH activity was increased to 70% of controls, reflecting induction of Se-independent peroxidase, compared with that with 15 days' depletion. Phenytoin-initiated cleft palates with 40 days' depletion appeared to be reduced (16%) compared with Se-replete controls (24%) (P < .07). In 40-day Se-depleted animals given selenite rescue, the 10% incidence of cleft palates was significantly lower than that in the 40-day Se-replete group (24%) but not the Se-depleted group (16%). This is the first demonstration of reduced Se-dependent GSH peroxidase activities in embryonic tissues with dietary Se-deprivation. The results implicate reactive oxygen species and lipid hydroperoxides in the mechanism of phenytoin teratogenicity and suggest that GSH peroxidases are important embryoprotective enzymes. 相似文献