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Absorption of NO2 into Na2S solution in a stirred tank reactor 总被引：1，自引：1，他引：0
To understand the absorption mechanism of nitrogen dioxide into a sodium sulfide solution, a stirred tank reactor with a plane gas-liquid interface was used to measure the chemical absorption rate of diluted nitrogen dioxide into sodium sulfide solution. The absorption rates under various experimental conditions were measured and the effects of experimental conditions on nitrogen dioxide absorption rate were discussed. The results show that, in the range of this study, nitrogen dioxide absorption rate increases with increasing sodium sulfide concentration, nitrogen dioxide inlet concentration, and flue gas flow rate, but decreases with increasing reaction temperature and oxygen content in flue gas. 相似文献
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针对硝基苯废酸提浓尾气处理装置存在的问题,结合废酸提浓尾气处理装置改造实例,分别采用水、未提浓混酸和氢氧化钠溶液、水和双氧水串级做吸收剂。结果表明：采用压缩法脱除有机物气体和加压法水吸收、双氧水两级串联吸收氮氧化物气体的方法,对于尾气中浓度为130000～190000mg／m^3的苯、17～38mg／m^3的硝基苯和30～90×10^4mg／m^3的氮氧化物的平均脱除率可达99％以上。 相似文献
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工业生产废气对大气造成较为严重的污染,其主要是硫化物、氮化物的排放量超标。WK陶瓷催化剂袋式脱硫脱硝、除尘一体化烟气净化技术,是一项具有国际创新的系统集成技术,通过单一的单元控制过程,同步去除烟气中的硫氧化物、氮氧化物、氯、氟和灰尘,高效取代传统三步式组合工艺,具有显著优点,可以很好地解决窑炉烟气排放不达标的问题。 相似文献
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Decomposition of dimethyl sulfide （DMS） in air was investigated experimentally by using a wire-cylinder dielectric barrier discharge （DBD） reactor at room temperature and atmospheric pressure. A new type of high pulse voltage source with a thyratron switch and a Blumlein pulse-forming network （BPFN） was adopted in our experiments. The maximum power output of the pulse voltage source and the maximum peak voltage were 1 kW and 100 kV, respectively. The important parameters affecting odor decomposition, including peak voltage, pulse frequency, gas flow rate, initial concentration, and humidity, which influenced the removal efficiency, were investigated. The results showed that DMS could be treated effectively and almost a 100% removal efficiency was achieved at the conditions with an initial concentration of 832 mg/m3 and a gas flow rate of 1000 ml/min. Humidity boosts the removal efficiency and improves the energy yield （EY） greatly. The EY of 832 mg/m3 DMS was 2.87 mg/kJ when the relative humidity was above 30%. In the case of DMS removal, the ozone and nitrogen oxides were observed in the exhaust gas. The carbon and sulfur elements of DMS were mainly converted to carbon dioxide, carbon monoxide and sulfur dioxide. Moreover, sulfur was discovered in the reactor. According to the results, the optimization design for the reactor and the matching of high pulse voltage source can be reckoned. 相似文献
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研究了硫酸-硫酸铁酸性溶液氧化吸收硫化氢的工艺条件.采用廉价的天然原料,氧化吸收和铁盐再生同步完成,可以连续运行.工艺条件为:室温,0.5mol/L硫酸,1.0mol/L铁离子,硫化氢最大吸收率为99.2%. 相似文献
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本文介绍了一种在实验室中利用火花放电,模拟闪电这一自然现象,成功将空气中的氮气还原为二氧化氮的方法实验,并对其最佳实验条件进行了研究。 相似文献
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侯亚宁 《武汉工程职业技术学院学报》2020,(1):12-15,32
分析了某焦化厂制硫酸装置尾气中二氧化硫和硫酸雾排放现状。采用超重力联合技术,在超重力脱硫机前端增加钠碱复喷脱硫,后端增加湿式电除雾净化的组合方式来净化制酸尾气。制酸尾气通过烟道进入钠碱复喷吸收器,尾气中50%左右的SO2被碱液吸收,经初脱后的尾气进入超重力脱硫机,尾气中SO2被进一步充分吸收,尾气再经电除雾器除酸雾后从排气筒排放。采用此联合技术大大提高了制酸尾气中SO2和硫酸雾的净化效率,减少了对环境的排放和污染,既满足了环保要求,又确保了员工的职业健康安全,在环保和安全生产方面都具有积极作用。 相似文献
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Chemical absorption of CO2 into aqueous slurries of Ca(OH)2 was studied in a stirred thermostatic reactor. The influence of solid loading and stirring speed on absorption rate were investigated experimentally, and the results show that the enhancement factor increases with particle content due to the increase of reactive particles in the gas-liquid interfacial region. The absorption process was controlled by the diffusion of gas molecules in slurry. The influence of stirring intensity on enhancement factor is an integration of gas-liquid and liquid-solid mass transfer variation. A novel prediction model of enhancement factors was proposed with the partition of interface into two various zones, and the prediction values by the presented model are in agreement with the experimental data. 相似文献
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INTRODUCTION Nitrogen oxide (NOx) is one of the main air pol- lutants found in the flue gases from chemical and power plants belching acid rain and photochemical smog. Over 90 percent of all man-made nitrogen ox- ides that enter our atmosphere are produced by the combustion of various fuels. Compared with the ad- vanced stage of SO2 gas removal technologies devel- opment, the removal of NOx gases is still in the initial stages of development as roughly 90 to 95 percent of NOx emitted i… 相似文献
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Danckwert's method was used to determine the specific interfacial area, a, and the individual mass transfer coefficient, kL, during absorption of CO2 in a bubble column with an anionic surfactant in the carbonate-bicarbonate buffer solution and NaAsO2 as catalyst, the presence of which decreases the specific interfacial area and the individual mass transfer coefficient. The specific interfacial area and the individual mass transfer coefficient increase with increasing superficial gas velocity. The specific interfacial area decreases whereas the individual mass transfer coefficient increases with increasing temperature. The results of experiments were used to determine the dependence of a, kL, and kLa on the surface tension, the temperature of the absorption phase, and the superficial velocity of the gas. The calculated results from the correlation were found to be within 10% deviation from the actual experimental results. 相似文献
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INTRODUCTION Nitrogen oxides (NOx) are significant airborne contaminants resulting from fossil fuels combustion. The use of metal chelate additives for combined re- moval of NOx and SO2 in FGD (flue-gas desulfuriza- tion) systems was investigated by several groups (Harriott et al., 1993; Tsai et al., 1989; Shi et al., 1996a; 1997). Fe(II)EDTA (EDTA, ethylenediami- netetraacetate) as an additive for removing nitric oxide (NO) from flue gas had been extensively stud- ied, with the … 相似文献
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Ferrous chelate absorption is deemed a promising method for NO removal from flue gas, but the key problem is the difficulty to regenerate the absorption solution, i.e. the complexes of FeⅡ(EDTA)NO and FeⅢ(EDTA) in the solution. Two bacterial strains isolated recently from the sludge of the denitrification step of a municipal wastewater treatment plant could be applied effectively to regenerate the absorbent were Pseudomonas sp. and klebsiella trevisan sp. Pseudomonas sp. exhibited high reduction ability on FeⅡ(EDTA)NO and the klebsiella trevisan sp. was more suitable for FeⅢ(EDTA) reduction. 相似文献
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INTRODUCTIONThecombustionoffossilfuelsgeneratesSO2andNOxpollutantscausingairpollutionandacidrain.Existingfluegasdesulfurization(FGD)scru-bbersareefficientforcontrollingSO2emission,butareincapableofremovingwater-insolublenitricoxide.WeandotherresearcheshadreportedtheuseofmetalchelateadditivesinFGDsystemsforcom-binedremovalofNOxandSO2(Shietal.,1996a;1996b;1996c;1997;LittlejohnandChang,1990;Tsaietal.,1989;Harriottetal.,1993).FeII(EDTA,ethylenediaminetetraacetate)isoneofthemostprom… 相似文献