关于水煤浆气化炉文丘里洗涤器结构及流程优化小结

水煤浆气化炉文丘里洗涤器的主要作用是对水煤气进行洗涤除尘.针对在实际运行过程中,由于文丘里洗涤器结构不合理及其洗涤水水质差,导致文丘里洗涤器喷头出水孔结垢堵塞,影响洗涤效果,以及文丘里洗涤器喉管及套管冲刷泄漏,影响生产装置的安全稳定运行的问题,通过对文丘里洗涤器结构及洗涤水流程进行技术改造优化,消除所存在的问题.     

文丘里洗涤器损伤原因分析及对策

针对大型壳牌煤制气装置的文丘里洗涤器出现筒体穿孔泄漏，导致煤气化、合成氨等装置停车问题，以某50万t/a煤制合成氨的文丘里洗涤器泄漏事故为例，分析了设备损伤的原因，并提出了解决问题的方案思路。     

文丘里洗涤器堵料事故浅析

文丘里洗涤器堵料事故浅析陈接龙（江西贵溪化肥厂３３５４２４）在用预中和转鼓氨化造粒工艺生产磷酸二铵时，生产中的尾气通常采用两种洗涤工艺，其一是文丘里洗涤器，其二是卧式洗涤器，如图１所示。我厂自１９９１年投产至１９９４年２月间曾多次发生文丘里洗涤器堵料...     

文丘里洗涤器的工艺计算

为贯彻国家对磷肥工业污染物排放的严格要求,介绍了文丘里洗涤器的工艺计算,核算了150 kt/a过磷酸钙装置氟吸收系统的氟排放浓度,认为再增加一级文丘里洗涤器即可满足要求,因系统阻力增加,尾气风机须作相应处理。     

文丘里洗涤器的工艺计算

为贯彻国家对磷肥工业污染物排放的严格要求,介绍了文丘里洗涤器的工艺计算,核算了150 kt/a过磷酸钙装置氟吸收系统的氟排放浓度,认为再增加一级文丘里洗涤器即可满足要求,因系统阻力增加,尾气风机须作相应处理。     

100kt/a磷复肥除尘洗涤系统技改总结

针对云天化云峰分公司磷肥厂100 kt/a磷复肥装置除尘、洗涤系统除尘效率低、尾气带液现象,对其进行技改,包括安装文丘里洗涤器,撤除旋风除尘器,新增加一个布袋除尘器。技改后尾气可以达标排放,产量提高768 t/a,节电126.144万k W·h/a,取得良好的经济效益。     

介绍国外几种改进的除尘设备

美国1972年出版的<细尘和微粒的脱除>(Fine Dust and Particulates Removal)书中报道了美国关于除去细尘和微粒的各种设备改进的一些专利。下面介绍五种有关设备,不作系统叙述,仅摘录其特点,供参考。 文丘里洗涤器 美国专利号3,567,194,开米科公司在1971年3月2日报道了对文丘里洗涤器设计改进的专利。此文丘里洗涤器也可称为湿壁文丘里洗涤器。这种文丘里洗涤器与一般文丘里洗涤器的不同之处为:1.洗涤液在气体     

尾气处理中带夹套文丘里洗涤器的设计

本文通过对用于钛白粉生产装置中尾气处理工段里带夹套文丘里洗涤器的强度设计,从理论上详细阐述其强度设计过程与方法,通过在实际应用中的验证,本设备运行正常。同时抛砖引玉,共同分享尾气处理工段中文丘里洗涤器的设计经验。     

自吸式文丘里洗涤器吸收效果的影响因素

为考察影响自吸式文丘里洗涤器吸收效果的因素,以自吸式文丘里洗涤器为研究对象,建立了以乙醇-水为工作介质的耦合理论模型,并搭建了相应的试验装置。通过在自吸式文丘里洗涤器内部添加挡板的方式研究了带液量和分散雾化率对吸收效果的影响。结果表明:挡板会对自吸式文丘里洗涤器带液产生一定阻挡作用,但会在一定程度上提高自吸式文丘里洗涤器的自吸雾化率。外径相同、内径由小到大的环形挡板A1、A2、A3对文丘里洗涤器洗消效果影响不同,A2、A3挡板有效提升了吸收效率,A1挡板使吸收效率降低。一定范围喉部气速下吸收效果随挡板宽度增加而减小。     

文丘里洗涤器在净化粗煤气中的应用及优化

阐述了文丘里洗涤器在粗煤气洗涤分离上的应用及存在的问题。结合实际情况，重新设计优化了文丘里管，解决了文丘里洗涤器在粗煤气除尘洗涤过程中阻力过大的问题。     

恩德粉煤气化装置空喷塔改造工艺计算

介绍了恩德粉煤气化装置空心洗涤塔的技术改造方案及其工艺设计计算过程;改造后的运行效果表明,出水温度由60℃降低到48℃,空心洗涤塔连续运行时间由不到60天增加到100天。     

Mathematical Modelling of Non‐Isothermal Venturi Scrubbers

A mathematical model consisting of differential equations for energy, momentum and material exchange is developed for a non‐isothermal Venturi‐type scrubber. By this model, the effects of heat and mass transfer on droplets concentration distribution and removal efficiency of particulate in a non‐isothermal Venturi scrubber can be investigated. In order to approach a realistic model, the liquid film flow on the walls and droplet size distribution are considered. The model is validated by comparing the results of mathematical model by plant and experimental data reported in the literature. The Results section of this work reveals that the inlet humidity and temperature of the gas can affect the removal efficiency of the scrubber.     

有机硅装置中的除尘分离设备

介绍工业上应用的除尘分离。阐述沉降室、旋风除尘器、布袋除尘器、喷淋塔及文丘里洗涤器等除尘器的原理、构造及其在有机硅装置中的优化组合,并列举文丘里管除尘设备的工艺计算。     

大颗粒尿素洗涤塔的计算与分析

结合某厂大颗粒尿素洗涤塔技术改造的工艺要求，介绍了洗涤塔设计方案的选择论证过程，提出了板波纹规整填料和大孔穿流筛板的组合式设计方案，对不同规格的规整填料和塔板参数选择进行了对比和讨论，结果表明，板波填料采用3m高的125Y型，塔板采用板上无液层的大孔穿流筛板是理想的组合。     

Experimental verification of the effect of liquid deposition on droplet size measured in a rectangular Venturi scrubber

It has been reported by previous studies [1], [2], [3], [4], [5], [6], [7] that droplet size in a Pease-Anthony Venturi scrubber depends on the jet atomization conditions, such as jet velocity and gas velocity. The assumption of this paper is that actual collector-droplet size in a confined tube such as the Venturi scrubber also depends significantly on preferential droplet deposition on the tube walls, which remove preferentially droplets of a certain size from the core, modifying the mean droplet size of the remaining droplets. To account for this effect, the present study is focused on the experimental measurement of the liquid deposition on the walls of a Pease-Anthony Venturi scrubber and the droplet size remaining in the core. The experiments were carried out varying jet penetration and the number of the injection orifices. A correlation, using dimensionless numbers, was proposed to quantify the influence of each experimental condition. The results showed that liquid deposition has a significant influence in actual collector-droplet size inside a Venturi scrubber.     

稳定CO2压缩工况的技术措施

分析了脱氢反应器压差不稳和压缩机功耗上升的原因;采取了在合成氨脱碳再生塔和尿素装置CO2压缩机一段入口分离器之间增设CO2气体循环洗涤装置的技改措施,改造后,脱氢反应器的压差在5个月内始终维持在60~65 kPa,6个月后,压差也仅为85 kPa;提出了改进后尚待解决的遗留问题。     

A New Method of Eddy Diffusivity Calculation for Droplets of a Venturi Scrubber

An analytical model using eddy diffusivity is applied for predicting droplet concentration distribution and liquid film formation in a Venturi scrubber. By comparing experimental data of film formation reported in literature (Viswanathan et al., 1984) and the results obtained from this model, a semi‐empirical correlation for liquid droplets eddy diffusivity is obtained. The validity of this correlation is confirmed by obtaining good agreement between theoretical and experimental data of droplet concentration distribution and film formation in a Venturi scrubber (Viswanathan, 1998; Viswanathan et al., 1984).     

文氏栅洗涤器除尘脱硫实验研究

采用双碱法脱硫技术 ,在自行设计的多通道文丘里洗涤器 (简称文氏栅洗涤器 )进行模拟燃煤烟气的除尘脱硫试验。其试验过程是 :先在三种不同喉部参数 (分别称为 1# ,2 # ,3 # )的文氏栅洗涤器进行除尘试验 ,经过优选后 ,在 2 #文氏栅洗涤器上进行脱硫试验。试验结果表明经过优选的 2 #文氏栅洗涤器有着较高的除尘脱硫效率。当文氏栅洗涤器的运行参数为 :pH =12、液气比为 0 .75L/m3、 [Na+ ]=0 .3mol/L、 [SO2 ]=12 0 0× 10 -6,文氏栅洗涤器的除尘效率大于 96 % ,脱硫效率大于 80 %。经过完善后可用作中小型燃煤锅炉烟气的除尘脱硫     

Designing for pressure drop in Venturi scrubbers: the importance of dry pressure drop

An industrial scale Venturi scrubber pilot plant has been used to provide detailed measurements of pressure drop as a function of a broad range of operating conditions. Modelling approaches suitable for design predictions of ΔP have been examined. While numerical models provide clearer understanding of the phenomena occurring in scrubbers, analytical models offer the most promise of improving industrial design practice. These models concentrate on the work done on the liquid phase and ignore turbulence-induced gas phase accelerational (dry pressure drop) losses. However, the experiments show that the latter are important even in well-designed, classical Venturi shapes. Available models are compared, for the first time, with actual wet pressure drop data and agreement is shown to be good. By isolating the dry pressure drop effect, design models can be applied to a wider range of Venturi geometries.