共查询到18条相似文献,搜索用时 921 毫秒
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通过对循环流化床锅炉炉内脱硫与炉外脱硫两种脱硫方法的脱硫效果、投资、运行成本进行综合比较分析,认为两种脱硫方法在工程及设备上的投资基本相当,但采用炉外脱硫的效果较好、运行成本较低,因此炉外脱硫应是目前循环流化床锅炉脱硫的首选方法。 相似文献
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通过分析干法脱硫的工艺条件,提出了袋式除尘器作为二级除尘器运用于干法循环流化床烟气脱硫工艺时在设计、运行、维护中应注意的问题。 相似文献
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烧结机烟气选择性脱硫技术的研发与应用 总被引:2,自引:1,他引:1
介绍了钢铁工业烧结烟气选择性脱硫技术及循环流化床半干法脱硫工艺的原理、系统运行效.果及在应用中存在的问题,并对其发展提出了建议。 相似文献
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旋转喷雾干燥法(SDA)脱硫工艺系统的应用研究 总被引:2,自引:0,他引:2
本文介绍了旋转喷雾干燥法(SDA)脱硫工艺的基本原理、化学过程、主要设备、控制、脱硫副产物、系统运行与维护等,并与石灰石/石膏湿法脱硫工艺、烟气循环流化床工艺进行了比较,给出了脱硫系统投资及运行费用的经济比较。还对SDA脱硫工艺在国内应用中存在的问题进行了探讨。 相似文献
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三钢集团的球团工程采用了国际先进的带式焙烧机球团工艺,配套“循环流化床脱硫除尘+选择性催化还原法(SCR)脱硝”工艺用于处理焙烧烟气。文章通过将“循环流化床脱硫除尘+SCR脱硝”工艺与活性炭(焦)脱硫脱硝工艺进行对比,阐述了这两种主流工艺的优点及缺点,并阐述了选用“循环流化床脱硫除尘+SCR脱硝”工艺的理由,分析总结了带式焙烧工艺应对吸收塔塌床、热风炉故障及催化剂解吸的运行操作方法,实现了出口数据稳定、设备运转良好的目标。 相似文献
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本文阐述了煤燃烧污染中SO2的危害、控制方法和流化床燃烧中的脱硫机理。介绍了循环流化床锅炉石灰石脱硫系统设计中的问题,并提出了设计中的一些措施。 相似文献
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循环流化床锅炉添加石灰石脱硫是其特出优点之一,它具有脱硫效率高,脱硫成本低,操作简单、无水污染等特点.本文通过实例分析总结了循环流化床锅炉添加石灰石脱硫后排放与灰平衡计算方法. 相似文献
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烟气循环流化床干法脱硫系统的设计与调试 总被引:4,自引:0,他引:4
本文介绍了烟气循环流化床(CFB-FGD)干法脱硫技术应用在山西华能榆社电厂2×300MW机组大型脱硫除尘工程上的设计与调试,分析了大型化CFB-FGD工程的设计参数、运行情况及技术经济指标。 相似文献
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Destruction of polychlorinated biphenyls (PCBs) in contaminated soils and wastes using circulating fluidized bed combustion (CFBC) technology was studied using a pilot plant and simulated waste material. The results show that the technology is effective and particularly promising for treatment of PCB-containing materials like the toxic sludge from a large contaminated site. Destruction of the toxics in the gas phase appears to be very fast, and over 99.9999% destruction and removal efficiency can be achieved in the temperature range 875-880 degrees C. Heat transfer in the fluidized bed also appears adequate. Toxic residues in treated soil can be reduced to very low levels. Rate-controlling factors of the decontamination process are analyzed, and key issues for determination of the process conditions are discussed. 相似文献
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Industrial-scale demonstration of a new sorbent reactivation technology for fluidized bed combustors
To minimize the disposal of highly reactive spent sorbent from a fluidized bed combustor, a new method for reactivation has been developed. The method consists of grinding the spent ash in a rotary mill, hydrating the ash with an excess of water, and mixing the wet ground ash with dry solids to absorb the excess water. The mixing process eliminates the formation of a concrete-like product that normally results as wet fluidized bed combustor ash ages. Pilot-scale combustion trials proved to be successful, and the process was scaled up using a 35MWt utility boiler at Purdue University. The test lasted for 3 days and resulted in net reduction of limestone sorbent use of 18%. The results generated in this work have been used to develop an economic evaluation for a 165MWe circulating fluidized bed (CFB) boiler, which projects significant savings due to reduction of limestone supply and ash disposal costs. The evaluation also suggests that the process is cost competitive with other processes, albeit that those processes have not been demonstrated at industrial scale. Furthermore, it also has the potential to make a small net reduction in CO(2) emissions, due to reduced limestone usage. 相似文献
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Erik Jerndal Tobias Mattisson Ivo Thijs Frans Snijkers Anders Lyngfelt 《International Journal of Greenhouse Gas Control》2010,4(1):23-35
Chemical-looping combustion is a novel combustion technology with inherent separation of the greenhouse gas CO2. The technology uses circulating oxygen carriers to transfer oxygen from the combustion air to the fuel. In this paper, oxygen carriers based on commercially available NiO and α-Al2O3 were prepared using the industrial spray-drying method, and compared with particles prepared by freeze-granulation. The materials were investigated under alternating oxidizing and reducing conditions in a laboratory fluidized bed, thus simulating the cyclic conditions of a chemical-looping combustion system. The particles produced by spray-drying displayed a remarkable similarity to the freeze-granulated oxygen carriers, with high reactivity when the bed was fluidized and similar physical properties when sintered at the same temperature. This is an important result as it shows that the scaling-up from a laboratory production method, i.e. freeze-granulation, to a commercial method suitable for large-scale production, i.e. spray-drying, did not involve any unexpected difficulties. A difference noticed between the spray-dried and freeze-granulated particles was the sphericity. Whereas the freeze-granulated particles showed near perfect sphericity, a large portion of the spray-dried particles had hollow interiors. Defluidization was most likely to occur for highly reduced particles, at low gas velocities. The apparent density and crushing strength of the oxygen carriers could be increased either by increasing the sintering temperature or by increasing the sintering time. However, the fuel conversion was fairly unchanged when the sintering temperature was increased but was clearly improved when the sintering time was increased. 相似文献
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A combination of biomass treatment, fluidized bed/membrane reactor, and a minimum-suspension fluidized bed reactor is proposed to remove strontium cations from aqueous solutions, such as those generated by nuclear reactors. After conducting a series of screening tests, three adsorbents were selected for their suitability and high adsorptive capacity. The proposed combination uses Chlorella vulgaris in a packed column, followed by the fluidized bed/membrane reactor with bentonite powder in suspension. The membrane is primarily used to retain bentonite powder in the reactor. However, the same can be designed to remove additional amount of contaminant from the aqueous stream. The final separation is carried out in a fluidized bed containing resins that are suspended with minimal airflow. In laboratory scale, a flow rate of 600 ml/h was achieved for 30 min during which period the inlet concentration of 100 mg/l was reduced to 2.5 mg/l at the outlet. Bio-encapsulation with thermophilic bacteria and subsequent separation is proposed at this point in order to reduce the concentration to an even lower level. The proposed separation scheme offers an acceptable solution to removing strontium while minimizing the generation of secondary waste. 相似文献