共查询到20条相似文献,搜索用时 46 毫秒
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国投海南水泥有限公司2000t/d生产线于1998年2月点火投产,同年12月份通过系统考核,产质量均能达到设计要求,生产线运转基本正常。在试生产期间,废气处理系统中主要存在问题是增湿塔喷雾增湿系统雾化效果差,电除尘器进口温度达180℃,烟囱排尘浓度达1000mg/m3(标况),大大超过国家环保标准。后公司采用南京工业大学陶瓷厂研制开发的NHP型高效节能喷雾增湿系统进行改造,取得良好效果。1基本情况1.1改造前的主机技术参数见表1表1主机技术参数回转窑Φ3.95m×56m分解炉Φ5m×19m(离线喷腾型)预… 相似文献
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1调节阀理想流量特性 调节阀在前后压差恒定条件下得到的流量特性,称为理想流量特性。调节阀阀芯曲面不同.所具有的流量特性也不相同。典型的理想流量特性有直线流量特性、等百分比流量特性、快开流量特性和抛物线流量特性见图1。 相似文献
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1改造前的情况 德外晶华集团大坝有限公司2500t/d预分解窑水泥生产线于2003年11月投产,其配套增湿塔规格为Ф8.5m×34.0m(有效高度),废气设计处理能力为420000m3/h。增湿塔增湿喷雾系统为回流式(见图1),安装回流式喷枪10支,均布。当工艺系统温度发生变化时,中控操作员根据电收尘器入口烟气温度变化调节回水电动阀门A的开度,控制回水量,从而达到控制喷水量的目的。例如,当生料磨停机时,减小回水电动阀门的开度,减小回水量,增大喷水量,降低烟气温度;而当生料磨重新开机时,为满足烘干物料的要求,要增大回水电动阀的开度,增大回水量,减小喷水量,提高出增湿塔的烟气温度。但当电动阀回水调节达不到要求时,还需关闭喷枪的电磁阀。 相似文献
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20世纪70年代初,我国水泥工业为降低热耗变湿法生产为干法,在取得了明显经济效益的同时,也带来废气温度高、含尘浓度大、环境污染严重等弊端。为了解决这些问题,出现了干法水泥厂增湿塔喷雾技术。目前,大多数干法水泥生产线已采用增湿塔对窑尾大量的高温烟气进行降温或调质处理,该技术操作稳定可靠、投资较低,取得了良好效果。1增湿塔喷雾技术的产生治理有害烟尘释放的最有效途径是在排放设备上配备电收尘器或袋式收尘器。电收尘器是使含尘气体在通过高压电场进行电离的过程中,把粉尘从气体中分离出来进行回收,以净化气体,收… 相似文献
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我公司二线2500t/d生产线于2010年10月份投产,窑尾采用四级旋风预热器,设计利用窑尾废气对含有水分约为35%~40%的湿电石渣进行烘干。窑尾没有设计增湿塔,在C1出风管(废气管)安装增湿喷雾系统对窑尾废气进行增湿。在2011年1月份窑操操作中发现窑系统风量不足,窑头和窑尾正压严重,熟料煅烧质量差,出现夹心料。对系统进行检查未存在漏风情况,停窑对系统进行检查,发现废气管堵塞严重。 相似文献
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0 前言 原湖南韶峰水泥集团从德国KHD公司引进1条2 000 t/d新型干法水泥生产线,其中,出预热器废气经增湿塔处理后, 由高温风机送至立磨或窑尾电除尘器.增湿塔喷雾系统采用高压回流方式使水雾化,由进口高压泵提供压力源和水源.该喷雾系统是由德国KHD公司配套进口,塔身为国内厂家分交制作.其主要参数为:设计尺寸:φ7.5 m×30m;设计处理风量:440000m3;烟气进口温度:330℃(短时450℃);烟气目标出口温度:180℃(进立磨),130℃(进电除尘器).自1996年投产以来,该增湿塔一直存在有较多的问题,影响了系统的正常生产,为此公司2006年5月公司决定对其进行技术改造.本文就增湿塔喷雾系统存在的问题及其改造方案和技改效果,作一总结介绍. 相似文献
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针对某干燥塔的结构特点及运行过程中传热传质特性,建立了该干燥塔中干燥过程的传热传质微分模型,并用试验数据验证其合理性。运用经典龙格库塔法获得该模型的数值结果,分析了传热传质过程中干燥氮气温湿度和锦纶切片温湿度沿塔高的分布情况。通过仿真优化操作条件,提高了干燥塔的干燥能力。 相似文献
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The article presents a full set of spray drying experiments for selected products performed in a co-current spray drying tower developed at Lodz Technical University. The experiments enabled identification of process and atomization parameters (feed properties, feed rate and feed temperature, drying agent temperature, air flow rate, atomization ratio, etc.) on drying and degradation kinetics, spray structure, particle residence time, and final product properties. Drying agent temperature measurements showed, in all cases, the initial increase of gas temperature in the spray envelope caused by the spray expansion and then a decrease induced by liquid evaporation and heat losses to the environment. PDA analysis confirmed that the initial velocity of particles was a function of a diameter and also the function of the distance from the axis. Practically an identical particle size distribution was observed in each cross-sectional area of the dryer. Negative values of particle velocity in the vicinity of the axis and at the edge of the spray envelope were found which proved that recirculation of particles appeared in the column. Analysis of final product properties showed that for agglomerate-like materials a decrease of bulk density with an increase of air temperature was related to morphological changes that occurred during drying and affected the shape of particles, surface structure, etc. The experiments proved that air/liquid ratio for two-fluid atomization and gas temperature were the most decisive factors controlling drying and degradation process rate and final product properties. 相似文献
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《Drying Technology》2013,31(6):1325-1349
Abstract The article presents a full set of spray drying experiments for selected products performed in a co-current spray drying tower developed at Lodz Technical University. The experiments enabled identification of process and atomization parameters (feed properties, feed rate and feed temperature, drying agent temperature, air flow rate, atomization ratio, etc.) on drying and degradation kinetics, spray structure, particle residence time, and final product properties. Drying agent temperature measurements showed, in all cases, the initial increase of gas temperature in the spray envelope caused by the spray expansion and then a decrease induced by liquid evaporation and heat losses to the environment. PDA analysis confirmed that the initial velocity of particles was a function of a diameter and also the function of the distance from the axis. Practically an identical particle size distribution was observed in each cross-sectional area of the dryer. Negative values of particle velocity in the vicinity of the axis and at the edge of the spray envelope were found which proved that recirculation of particles appeared in the column. Analysis of final product properties showed that for agglomerate-like materials a decrease of bulk density with an increase of air temperature was related to morphological changes that occurred during drying and affected the shape of particles, surface structure, etc. The experiments proved that air/liquid ratio for two-fluid atomization and gas temperature were the most decisive factors controlling drying and degradation process rate and final product properties. 相似文献
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压力喷雾干燥塔生产能力大到一定量时,单喷头喷雾干燥就难以满足生产的需要,这时应考虑采用多喷头进行喷雾干燥。以RGYP03-1000型压力喷雾干燥塔在奶粉生产中的应用为例,对多喷头和热风分布器的结构设计进行了阐述。 相似文献
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文章在喷淋实验塔中,研究了氨法烟气脱硫的特性。将空气和气态二氧化硫按一定比例混合后的气体作为模拟烟气,用氨水作为脱除二氧化硫的吸收剂,对模拟烟气的进气温度、进气浓度、气速、液气比以及吸收液的pH五个因素对脱硫率的影响进行了逐一考察,获得了各因素与脱硫率之间的关系,并得到较适宜的操作参数。实验结果表明:随着液气比和吸收液pH的增大,脱硫率增大。随着模拟烟气进气温度、进气浓度和气速的增大,脱硫率降低。其中温度因素对脱硫率的影响不明显。实验得到适宜的操作参数为:常温下,模拟烟气气速为2.0m/s,液气比为10,pH为6.4时,对浓度为2000mg/m^3的烟气操作,收率可维持在85%以上,并在理论上对各因素和脱硫率之间的内在联系作了理论分析。 相似文献
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《分离科学与技术》2012,47(13-15):1843-1855
Abstract This paper reports on the development of a comprehensive model to simulate the absorption of gaseous SO2 into a calcium hydroxide slurry in a spray dryer flue gas desulfurization system. In this study, the model was modified to incorporate the input of surface area of the calcium hydroxide particles. Previous studies assumed spherical particles. A sensitivity analysis was then conducted to determine the sensitivity of the model to surface area at particle size of 2, 3, 4, and 6 micrometers. 相似文献