流化床技术在提高尿素产品质量中的应用

应用尿素流化床装置有效解决了因造粒塔能力不足而造成的成品尿素温度偏高、粉尘含量较高、平均粒径偏小、存放易结块等问题，并且具有良好的经济效益。     

粉尘含碳球团还原方式及气氛对其还原挥发性能的影响

在1150℃和1250℃、0．1L／min和10L／min的气量下，对通人含不同CO2量的氮气影响粉尘含碳球团还原速度的实验研究表明：以滚动方式所造球团中，氧化物的还原完全以间接还原的方式进行，气氛中非还原气体流速（或流量）的增加对粉尘含碳球团氧化铁还原速度有显著的降低作用，但还原温度提高则对气量增加造成的氧化铁还原速度降低有显著的抵消作用．气氛对球团中锌的挥发速度影响很小，对铅的挥发速度几乎不产生影响．     

水泥工业袋除尘技术及发展趋势

中国是最大的发展中国家，水泥产量连续数年居世界第一，但由于水泥工业设备整体较发达国家相对落后，也是我国工业烟尘污染大户。据2000年环境统计报告，我国水泥行业的烟尘和粉尘（统称工业颗粒物）排放量居各工业行业之首，达到809万吨，占全国工业颗粒物排放总量2045万吨的40％。其中水泥粉尘排放量为768万吨，占全国工业粉尘总排放量1092万吨的70％。     

新疆哈密垦区集中供热锅炉粉尘点源排放特点分析

本文根据新疆生产建设兵团农13师（即哈密垦区）环境监测站2007—2009年的监测资料。分析了哈密垦区集中供热锅炉粉尘点源排放特点。主要结论为：锅炉粉尘排放浓度下降,达标情况趋于好转,但部分锅炉粉尘排放浓度仍然偏高;各粉尘排放源表现出较强的性质差异。据此提出相应的应对措施。     

Coal Dust Explosions in a Large Scale Experimental Tube

Coal dust explosion conducted in a 200 mm diameter, 29.6 m long tube is prese nted in this paper. 40 dust dispersion system sets were used to disperse coal du st into the tube. A constant temperature hot wire anemometer was used to measure the gas velocity during the dispersion process. Kistler piezoelectric pressure sensors were used to measure the propagation of the pressure wave during the exp losion process. The overpressure of coal dust explosion in the tube was 70 kPa and the velocity of pressure wave...     

输煤系统粉尘治理

三河电厂一期2×350MW二期2×300MW机组用煤为火车进煤,所有来煤均需通过两台翻车机卸车,年翻卸列车近6万节,约320万吨.其中设有两台C形转子式翻车机,两台DQ1500型斗轮机,23条皮带机系统及筒仓原煤仓等辅助设备;投产初期由于粉尘浓度大造成环境污染严重,给检修及运行带来不便,并且清理廊道卫生时浪费了大量水源,部分原煤随冲洗浪费.我们通过自行设计对输煤系统所有抑尘装置进行了改造,经现场测试,粉尘浓度低于国家标准,粉尘治理上取得了良好效果.     

国外水泥生产技术与设备的发展

阐述了国外水泥生产技术与设备的发展概况，介绍了发达国家在应用新型干法水泥生产新技术方面所取得的成就。新型干法技术的出现，提高了劳动生产率和产品质量，扩大了生产规模，降低了产品热耗，有效控制了烟尘、粉尘、有害气体的排放，文中对生料制备、烧成，水泥粉磨、废渣再利用、自动化过程控制技术、性能各异的特种水泥以及散装水泥的发展等也做了简述。     

GJS10/100J高压静电除尘器的改造

牡丹江水泥集团烧成二分厂生料车间现有两台Φ2.6×13m球磨机。原采用拔气筒自然通风,粉尘排放浓度有时达300mg/N·m3。不符合国家环保要求,严重损害职工健康。2000年底,准备引进GJS10/100J型高压静电除尘器,根据牡丹江地区气候:夏季雨水集中,冬季严寒的特点,考察了几家使用该型号收尘器的厂家,发现一些问题:①夏季雨大料湿易堵料,冬季内筒结露,电磁瓶结冰易放电。②电场两极振打无力,内筒体清灰不好。③伞圈低小,遮挡不住大雨雪且易变形。针对以上问题,在安装该收尘器时进行了如下改造:①在除尘器侧面筒体上对称安装电机偏心轮结构振打器…     

Investigation of effective dimensionless numbers on initiation of instability in combustion of moisty organic dust简

In this work, the effect of various effective dimensionless numbers and moisture contents on initiation of instability in combustion of moisty organic dust is calculated. To have reliable model, effect of thermal radiation is taken into account. One- dimensional flame structure is divided into three zones： preheat zone, reaction zone and post-flame zone. To investigate pulsating characteristics of flame, governing equations are rewritten in dimensionless space-time （（, r/, ~） coordinates. By solving these newly achieved governing equations and combining them, which is completely discussed in body of article, a new expression is obtained. By solving this equation, it is possible to predict initiation of instability in organic dust flame. According to the obtained results by increasing Lewis number, threshold of instability happens sooner. On the other hand, pulsating is postponed by increasing Damk6hler number, pyrolysis temperature or moisture content. Also, by considering thermal radiation effect, burning velocity predicted by our model is closer to experimental results.     

Kinetics study of leaching arsenic from Ni-Mo ore roasting in dust mixture of hydrochloric and sulfuric acids

The kinetics of leaching arsenic from Ni-Mo ore roasting dust was investigated. The effects including leaching temperature, particle size of the smelter dust, stirring speed, the coefficient β（the molar ratio of sodium chlorate to arsenic in the smelter dust） and the initial H＋ concentration on leaching arsenic were studied. The results indicate that the leaching of arsenic increases sharply with the decrease of particle size. The orders of reaction with respect to H＋ concentration and particle size are determinted to be 1.136 and 1.806, respectively. The leaching of arsenic reaches 99% under experimental conditions, the apparent activation energy is determined to be 11.157 kJ/mol, which is consistent with the values of activation energy for diffusion model The kinetics equation of leaching arsenic from the roasting dust could be expressed by a semi-empirical equation as 1-2/3η （1 -η）^2/3 = k0（c[H＋]）^1.136ro^-1.806 exp[（-11157 /RT）t].