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低温铁基复合脱硫剂的制备及脱硫性能研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/10/26 13:24:23  

摘要:H2S是一种酸性易燃且剧毒性气体,少量的H2S气体就会对人的身体造成伤害,工业生产过程中H2S的存在会腐蚀管道和设备,它还会与催化剂发生反应是催化剂中毒。如果将工业生产过程中产生的H2S直接排放到环境中,会污染环境,国家对于H2S气体的排放也有严格的要求,因此工业尾气排放之前必须进行脱硫处理,使之达到排放标准。

本文以铁盐和钛盐两种金属为活性组分通过不同的制备方法制备了铁基复合脱硫剂,并探究活性组分配比,焙烧温度和碱比等制备条件对脱硫剂的结构和性能的影响。

通过还原共沉淀法制备的Fe/Ti纳米复合脱硫剂,通过XRD、IR、SEM和BET等测试方法对脱硫剂进行表征,结果表明,Ti4+的掺入会进入铁氧化合物中,形成氧桥结构,在脱除H2S时,氧桥结构易于和HS-和S2-发生反应。Ti4+的掺入降低脱硫剂的晶粒尺寸,减少气体进入晶粒内部的内扩散阻力,增加活性组分利用率。Ti4+的掺入有利于改善脱硫剂的分散性,减小了孔径,使脱硫剂的比表面积和孔体积增加。在脱除硫化氢时可以提高传质速度,降低传质阻力,增加化学反应速率;焙烧温度影响脱硫剂的晶粒尺寸,决定脱硫剂的脱硫性能,当焙烧温度升高后,脱硫剂的晶粒尺寸增加,脱硫剂的硫容急速下降。

通过共沉淀法制备了Fe-Ti/ATP复合脱硫剂。在ATP上负载金属化合物不会改变载体的特征结构,会降低脱硫剂的晶粒尺寸,增加活性组分的分散性。单一铁在ATP负载后,脱硫剂的比表面积增加,孔体积降低;单一钛的负载会降低脱硫剂的比表面积,增加孔体积;双金属复合脱硫剂会结合两种金属的优点,增加脱硫剂与H2S的反应速率。升高反应温度,气体扩散速率增大,进入颗粒内部的H2S数量越多,提高了脱硫剂颗粒内部利用率;脱硫反应速率增大,加快脱硫剂与H2S的反应,相同停留时间出口H2S浓度降低,脱硫剂穿透硫容增加。

以碱改性的粉煤灰为载体,用浸渍沉淀法制备了Fe-Ti/FA复合脱硫剂。当碱浓度为1 mol/L时,粉煤灰的强度最好,活性组分的分散性较好,相比较没有用碱改性载体制成的脱硫剂基本没有脱硫活性。活性组分在粉煤灰上的最佳负载量只能达到20 %左右,这是因为粉煤灰的比表面积和孔径都不大,不能过多的负载活性组分,活性组分过量会堵塞粉煤灰的孔道,并在表面发生团聚现象。

Hydrogen sulfide is an acid and harmfulgas. Its existence not only endangers personal safety, but also causescorrosion to transportation pipelines and equipment in industrial productionprocesses, and inactivates catalyst poisoning. If the H2S generated in theindustrial production process is directly discharged into the environment, itwill pollute the environment.The state also has strict requirements for H2S gasemissions. Therefore, industrial exhaust gas must be desulfurized beforedischarge to meet emission standards.

In this paper, iron-based and titanium saltswere used as active components to prepare iron-based composite desulfurizers bydifferent preparation methods. The structure and properties of thedesulfurizers were investigated by the active group distribution ratio,calcination temperature and alkali ratio. influences.

The Fe/Ti nanocomposite desulfurizerprepared by reduction coprecipitation method was characterized by XRD, IR, SEMand BET. The results show that the incorporation of Ti4+ enters the ferrite andforms an oxygen bridge structure. When the H2S is removed, the oxygen bridgestructure is liable to react with HS- and S2-. The incorporation of Ti4+reduces the grain size of the desulfurizer, reduces the internal diffusionresistance of the gas entering the interior of the grain, and increases theutilization of the active component. The incorporation of Ti4+ is advantageousfor improving the dispersibility of the desulfurizing agent, reducing the porediameter, and increasing the specific surface area and pore volume of thedesulfurizing agent. When removing hydrogen sulfide, the mass transfer rate canbe increased, the mass transfer resistance can be lowered, and the chemicalreaction rate can be increased. The calcination temperature affects the grainsize of the desulfurizer, determines the desulfurization performance of thedesulfurizer, and the crystal of the desulfurizer is increased when thecalcination temperature is increased. As the particle size increases, thesulfur capacity of the desulfurizer decreases rapidly.

Fe-Ti/ATP composite desulfurizer wasprepared by coprecipitation method. The loading of the metal compound on theATP does not change the characteristic structure of the carrier, lowers thegrain size of the desulfurizing agent, and increases the dispersibility of theactive component. After ATP loading, the specific surface area of thedesulfurizer increases and the pore volume decreases. The loading of singletitanium reduces the specific surface area of the desulfurizing agent andincreases the pore volume. The bimetallic composite desulfurizing agentcombines the advantages of the two metals to increase the desulfurizing agent.Reaction rate with H2S. Increasing the reaction temperature, the gas diffusionrate increases, and the more the amount of H2S entering the particle, thehigher the utilization rate of the desulfurizer particles. The desulfurizationreaction rate increases, the reaction of the desulfurizer with H2S isaccelerated, and the H2S concentration of the outlet is decreased at the sameresidence time. The desulfurizer increases the sulfur capacity.

Fe-Ti/FA composite desulfurizer wasprepared by impregnation coprecipitation method with alkali modified fly ash ascarrier. When the alkali concentration is 1 mol/L, the strength of the fly ashis the best, and the dispersibility of the active component is good, and thedesulfurization agent prepared without the alkali-modified carrier hassubstantially no desulfurization activity. The optimum loading of the activecomponent on the fly ash can only reach about 20 %. This is because thespecific surface area and pore diameter of the fly ash are not large, and theactive component cannot be excessively loaded, and the active component isexcessively clogged. The pores of fly ash and agglomeration on the surface.

关键词:低温脱硫剂;H2S;铁基脱硫剂

Low temperature desulfurizer; H2S;Iron-based desulfurize

上一篇:联苯醇废水的类Fenton处理及与其它废水耦合处理的研究     下一篇:碳基脱硫剂的制备和常低温下脱硫性能研究
 
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