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基于最小二乘支持向量机的氨法烟气脱硫装置脱硫效率预测 总被引:1,自引:0,他引:1
针对如何提高氨法烟气脱硫装置脱硫效率的预测精度,建立了以烟气量、喷淋浆液密度、液气比、喷淋塔pH值、预洗涤塔pH值和浓缩槽pH值为输入变量,以脱硫效率为输出量的最小二乘支持向量机(LS-SVM)脱硫效率的预测模型,并运用这一模型对某135 MW机组氨法烟气脱硫装置的脱硫效率进行了预测评判.结果表明:与传统的支持向量机模型进行比较,LS-SVM模型预测结果的最大误差只有传统模型的14%左右;LS-SVM模型所得预测值与实际值的误差小于5%,完全在工程所允许的误差范围之内,模型是可行的. 相似文献
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实验采用电石渣做为脱硫剂,对气液双流程液幕式脱硫塔的脱硫性能以及传质特性进行了相关的实验研究。通过实验测试,提出了烟气流量、浆液循环量、液气比值等主要影响参数对液幕式脱硫塔的脱硫性能的影响。同时本研究提出了一个相关气液双流程脱硫塔的传质模型,其形式如:Sh=16.226Reg0.863Rel-1.64和Sh=27.126Reg-0.77(L/G)-1.64。基于气液传质模型,双流塔内浆液与烟气间复杂的气液传质过程可以通过烟气雷诺数,浆液雷诺数以及液气比描述的经验关系式进行定量计算。这些参数的影响规律为研究液幕式湿法烟气脱硫系统中二氧化硫的反应特性及实际工程的应用提供了重要的指导数据。实验发现,浆液循环量增加时,总的脱硫效率相应会提高,液气比增加时,总的脱硫效率也相应会提高。而烟气流量增加时,相应的脱硫效率却随之降低。通过实验研究发现:当液气比大于20L/m3时,脱硫率可达90%以上;然而pH值对传质的影响作用很小。 相似文献
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采用两种细度石灰石作为脱硫剂,对喷淋式脱硫塔的脱硫特性进行了试验研究,试验结果表明在一定烟气流速下,脱硫效率随液气比的增大而增大;在高烟气流速下,脱硫效率随液气比的增大而增加的趋势更加显著.脱硫效率随着提高浆液的pH值而提高,随入口烟气SO,浓度增加而下降;石灰石粒径越小,其溶解性好,有利于提高脱硫效率.结合吸收段阻力... 相似文献
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基于喷淋、冲击、自激、旋流的原理,综合了旋流加格栅的特点,以强化气液间的传质。针对影响脱硫效率的主要因素,如液封高度、喷淋液pH值、烟气含湿量及内塔穿孔气速,进行了一系列试验,试验表明,当喷淋量为110.68 m3/h,液封高度调节到1230 mm,烟气的含湿量控制在5.56左右,pH值维持在8~9之间,内塔穿孔气速为14.5 m/s左右时,脱硫效率可达98.5%,是一个较好的工况点。工业应用表明该装置脱硫效率大于97%,设备阻力小于1200 Pa。 相似文献
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建立了石灰石/石膏湿法烟气脱硫喷淋塔实验台,实验研究了重要的操作参数对喷淋塔脱硫效率的影响规律。实验结果表明,提高液气比和浆液pH值、降低烟气温度和烟气速度、降低入口烟气的SO2浓度以及强制氧化均可以提高脱硫效率。将喷淋浆液分成喷淋液滴和塔壁液膜两种存在形式,并分别建模,喷淋液滴的脱硫过程采用Gerbec液滴脱硫模型计算,将塔壁液膜的流动分为层流和波动层流两种状态,发展出了新的喷淋塔脱硫反应模型。模型计算结果表明,相对于Gerbec液滴模型,本文的模型计算结果与实验数据吻合得更好。 相似文献
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针对湿法烟气脱硫(FGD)装置在运行中存在承受高硫烟气能力较弱、脱硫效率较低、吸收塔浆液pH值偏高等问题,进行了添加DSA-5060型脱硫增效剂与脱硫效率、浆液pH值等关键参数之间的试验。结果表明:添加增效剂后,提高了脱硫效率、降低了吸收塔浆液pH值,FGD设备结垢现象得到了改善。 相似文献
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利用双膜理论建立了脱硫过程的理论模型,以国内某百万千瓦级火电机组烟气脱硫系统的脱硫塔为例进行了数值计算,分析了浆液pH值、入口SO2质量浓度、液气比、锅炉负荷、浆液液滴粒径、喷淋层投运方式及吸收塔塔径等参数对脱硫效率的影响,并与工程实际数据进行了比较.结果表明:数值计算结果与生产现场运行数据比较吻合;各喷淋层的脱硫能力不一样,第3喷淋层的脱硫能力最强,第2喷淋层和第1喷淋层的脱硫能力次之;脱硫效率随浆液pH值和液气比的增大而提高,随入口SO2质量浓度、锅炉负荷和浆液液滴粒径的增加而逐渐降低. 相似文献
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H2S is a detrimental impurity that must be removed for upgrading biogas to biomethane. H2S removal selectivity over CO2 employing catalytic oxidative absorption method and its influence factors were studied in this work. The desulfurization experiments were performed in a laboratory apparatus using EDTA-Fe as the catalyst and metered mixture of 60% (v/v) CH4, 33% (v/v) CO2 and 2000–3000 ppmv H2S balanced by N2 as the simulated biogas. It was found that for a given catalytic oxidative desulfurization system, it exists a critical pH, at which desulfurization selectivity achieves the highest. It was also observed that desulfurization selectivity increased along with the increase of chelated iron concentration, gas flow rate, and ratio of gas flow rate to liquid flow rate (G/L). This demonstrated that high selectivity and high efficiency for biogas desulfurization could both be achieved through optimizing these parameters. Specific to the desulfurization system of this work, when the gas flow rate was set as 1.1 L/min, after optimizing the above mentioned parameters, i.e. EDTA-Fe concentration of 0.084 mol/L, absorption solution pH of 7.8, and G/L of 55, the desulfurization selectivity factor reached 142.1 with H2S removal efficiency attained 96.7%. 相似文献
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This paper presents a new liquid-screen gas–liquid two-phase flow pattern with discarded carbide slag as the liquid sorbent of sulfur dioxide (SO2) in a wet flue gas desulfurization (WFGD) system. On the basis of experimental data, the correlations of the desulfurization efficiency with flue gas flow rate, slurry flow rate, pH value of slurry and liquid–gas ratio were investigated. A non-dimensional empirical model was developed which correlates the mass transfer coefficient with the liquid Reynolds number, gas Reynolds number and liquid–gas ratio (L/G) based on the available experimental data. The kinetic reaction between the SO2 and the carbide slag depends on the pressure distribution in this desulfurizing tower, gas liquid flow field, flue gas component, pH value of slurry and liquid–gas ratio mainly. The transient gas–liquid mass transfer involving with chemical reaction was quantified by measuring the inlet and outlet SO2 concentrations of flue gas as well as the characteristics of the liquid-screen two-phase flow. The mass transfer model provides a necessary quantitative understanding of the hydration kinetics of sulfur dioxide in the liquid-screen flue gas desulfurization system using discarded carbide slag which is essential for the practical application. 相似文献