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针对石膏或磷石膏制备硫酸联产水泥的窑气特点,指出窑气净化工艺应考虑的问题,分析窑气净化工艺诸流程,认为进入净化工序前的窑气宜采用电除尘器除尘,净化工段宜把操作弹性大、阻力小的无填料洗涤塔(空塔)放在首段。 相似文献
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石灰窑窑气分离器粉尘排放装置的改造唐山碱厂张秀明几年前,唐山碱厂6座石灰窑采用的窑气分离器粉尘排放装置如图1所示。窑气经过窑顶管线引出后沿着切线方向进入窑气分离器内,靠离心力作用将较大颗粒的粉尘分离下来,粉尘经过螺旋输送机排放到水封槽内,再利用洗涤塔... 相似文献
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为进一步优化碳化塔操作,提出了采用适当提高氨盐水NH3与Na+的浓度、优化清洗塔操作以及维持适宜的碳化塔“中部温度”、提高碳化塔各段气相CO2的分压和适当补充窑气提高下段气量等措施,可进一步改善碳化作业状况,达到增产降耗的目的。 相似文献
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黄汉根 《化学工业与工程技术》2011,32(1):8-11
设计了一套水泥窑气CO_2捕集的侧线试验装置,利用自主研发的复合胺溶剂捕集窑气中的CO_2。试验结果表明,新型复合胺溶剂能使净化气中CO_2体积分数降至1.41%以下,产品气中CO_2体积分数达到99%以上。采用该技术,可实现CO_2减排并获得高纯度的CO_2产品气,为企业的CO_2减排提供技术支持。 相似文献
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设计了一套水泥窑气CO2捕集的侧线试验装置,利用自主研发的复合胺溶剂捕集窑气中的CO2.试验结果表明.新型复合胺溶剂能使净化气中CO2体积分数降至1.41%以下,产品气中CO2体积分数达到99%以上.采用该技术,可实现CO2减排并获得高纯度的CO2产品气,为企业的CO2减排提供技术支持. 相似文献
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作者试图从制酸工艺学角度探讨水泥与硫酸两个装置的两种工艺的内在联系,从窑气的特点出发,阐明窑气制酸的工艺特点。本文阐述了:1.窑气组成的计算方法及窑气组成与熟料热耗的定量关系;2.窑气中的CO的爆炸界限;3.窑气净化工艺及有关计算;4.窑气中CO对SO_2转化的影响;5.窑气中的H_2及Cn Hm对吸收的影响;6.硫的收率及硫的循环;7.成品酸质量。作者认为:电除雾器的使用对生产安全不存在威胁;无电除尘器的装置不宜采用典型的酸洗净化操作方式;窑气中SO_3很少的说法需要重新认识;NO的存在不是影响SO_3吸收的直接原因。 相似文献
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窑气鼓泡塔碳化法生产白炭黑的工艺探讨 总被引:3,自引:1,他引:2
介绍窑气鼓泡塔碳化法工业性生产白炭黑的试验。产品经检验达到国家水平,性能指标接近国外产品。本文分析和研究了窑气鼓泡塔生产白炭黑的基本问题,探讨了工艺扩大的途径。 相似文献
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Ya. G. Gaponov S. Ya. Mikhailov S. N. Panev V. M. Tkachenko 《Refractories and Industrial Ceramics》1980,21(7-8):353-357
Conclusions By reducing the gas velocity to 0.5–0.7 m/sec and thus increasing the time spent by the gas in the electrostatic precipitator to 14–20 sec, despite the formation of intense reverse corona we can obtain 99% purification of gas in the electrostatic precipitator, given optimum agitation of the precipitation electrodes and optimum electric supply, and provided that the kiln is firing a mixture containing not more than 50% caustic dust.Changing the kiln to firing of only dust trapped in the gas purification apparatus reduces the degree of purification in the electrostatic precipitator to 97–98%.By using rational electrode agitation we can reduce the dust entrainment by a factor of 3.4 in comparison with the existing operational conditions.If the electrostatic precipitator is supplied from an AUF-400 unit, the optimum type of voltage regulation is extremal. Units of the ATF type should be used at about 100 sparks per minute.With these regimes of operation of the kiln and the rational regime of operation of the electrostatic precipitators, the total degree of purification of the gas in the dust trapping system is 99.5–99.9%.Translated from Ogneupory, No. 7, pp. 23–28, July, 1980. 相似文献
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钛白粉的煅烧回转窑多为湿法进料,游离水干燥段占回转窑总长度的1/3,导致生产效率及热能利用率偏低。新工艺将饼状物料送入闪蒸干燥机,经来自回转窑尾部的热废气干燥,粉碎后送入回转窑煅烧,可使尾气排放的温度从300~350 ℃降至100 ℃左右,从而提高热利用率,减少尾气降温的成本,回转窑的生产能力也可提高30%。 相似文献
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ABSTRACT Transferring the necessary heat of evaporation to the stack is the bottleneck in convective vacuum drying of wood. Higher gas velocities are applied to compensate for the lower gas density and to obtain similar heat and mass transfer characteristics as under normal pressure. Like in conventional kiln drying the region with the most unfavorable drying conditions determines drying time and product quality. To use the full potential of the meanwhile established superheated steam vacuum drying technology, it is therefore necessary to work on an improved uniformity of process conditions in the kiln. To evaluate the fluid dynamics and its influence on the final moisture content, experimenls in a laboratory convective vacuum kiln were carried out. For different total pressures the profiles of dynamic pressure in the stack entry section were measured in a dry atmosphere. At normal pressure the profiles were determined between the board layers throughout the whole stack. For the same slack configuration vacuum drying tests were used to assess the impact of the velocity distribution in the slack on the final moisture content distribution-Regions of low gas velocities coincided well with regions of high final moisture content. 相似文献
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针对镁矿砂回转窑窑尾烟气污染环境的情况,阐述了碳酸氢钠干粉喷射(SDS)脱硫技术原理、实际应用与优缺点,并在实际项目中探究了镁矿砂回转窑烟气二氧化硫的去除效果。结果表明,在实际运行中采用SDS干法脱硫工艺处理后,镁矿砂回转窑烟气能够达到超低排放要求,ρ(SO2)≤35mg/m^3。项目投运后所产生的脱硫副产物主要成分为Na2SO3,可将其回收利用作为水泥添加剂辅料。该技术已成功推广应用到其他回转窑、焦炉和水泥窑烟气脱硫项目中,并取得了较好的应用效果。 相似文献