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针对搭建的炉排型垃圾焚烧实验台,采用计算流体力学(CFD)技术,模拟了炉内焚烧过程中流速、温度、O2含量和水蒸汽含量的分布情况。结果表明:合理的气流组织分布对提高焚烧炉的热效率至关重要;较低的入炉垃圾含水量和较高的过量空气系数有益于改善垃圾的焚烧工况;掺烧生物质是解决垃圾焚烧温度较低的有效工艺。 相似文献
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生活垃圾焚烧炉的选型与设计 总被引:3,自引:0,他引:3
简述了我国生活垃圾焚烧炉的发展现状,对已有各种焚烧炉的技术现状进行了比较,以往复炉排工和链板炉排式焚烧炉为代表就炉型结构,设计计算、焚烧炉必须达到的各项指标进行了论述。 相似文献
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城市生活垃圾焚烧处理技术及资源化利用 总被引:9,自引:0,他引:9
本文撰述了城市生活垃圾焚烧处理的各种技术和发展方向,并就垃圾焚烧炉的关键技术作了介绍。对于炉排型焚烧炉、流化床焚烧炉和回转窑焚烧炉的特点,并对余热锅炉设计参数的选取进行了详细的分析。 相似文献
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正"关于进一步做好生活垃圾焚烧发电厂规划选址工作的通知(发改环资规[2017]2166号)"(以下简称《通知》)指出,生活垃圾焚烧发电项目应选择技术先进、成熟可靠、对当地生活垃圾特性适应性强的焚烧炉,现在生活垃圾焚烧发电项目主要应用的成熟技术仍是炉排焚烧炉。炉排焚烧炉在国内垃圾焚烧发电项目中应用率较高,锅炉燃烧效率和污染物排放 相似文献
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为了新建垃圾焚烧发电厂焚烧炉设备选择的需要,及现有垃圾焚烧发电厂技术改造的需要,对市场上的主流垃圾焚烧炉进行深入研究,通过对炉排运动方式、炉排片间运动形式、炉排片制造工艺、炉排热应力释放形式、炉排横纵向布置方式、炉排片通风形式、炉膛形式、给料溜槽支撑方式、推料器形式、使垃圾在炉排上充分搅拌措施等方面的对比分析,得出不同项目情况下焚烧炉设备选型和技术改造的主要参考依据。 相似文献
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本文描述了城市生活垃圾焚烧处理的各种技术和发展方向,并就垃圾焚烧炉的关键技术作了介绍。论述了炉排焚烧炉,流化床焚烧炉和回转窑焚烧炉的特点,并对余热锅炉设计参数的选取进行了详细的分析。 相似文献
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A. K. Saha 《Numerical Heat Transfer, Part A: Applications》2013,63(8):795-818
The cause of high operating temperatures experienced by grate blocks in a waste-to-energy power plant is investigated. A three-dimensional numerical analysis is performed to assess convection from the grate to the underfire air supply and conduction within the grate. A number of geometric complexities, including variable solid thickness, extended surfaces, sharp curvatures, and narrow passages, are accounted for via a finite element approach. The grate temperature is found to be very sensitive to the flow characteristics beneath the grates. Analysis of a modified grate structure was performed, showing a 14% reduction in maximum grate temperature. 相似文献
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介绍了两台10/th链条炉脱硫改造的方法和测试结果。脱硫系统包括结合四角旋涡燃烧技术的炉内喷钙和尾部利用文丘里喷嘴和麻石水膜除尘器对脱硫剂加温活化两部分。测试结果表明,引入四角旋涡技术可以在不影响锅炉运行的情况下明显改善脱硫剂在炉膛内的混合煅烧,有利于提高炉内脱硫效率例用文丘里水喷嘴和除尘器,可以在较低Ca/S下实现较高脱硫效率。对原配有文丘里水喷嘴和麻石水膜除尘器的工业锅炉进行脱硫环保改造时,炉膛喷钙尾部增湿活化脱硫技术具有明显的技术经济优势。 相似文献
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Combustion of fixed fuel beds in grate furnaces is common within production of heat and power from solid fuels. Available theoretical and experimental experience provides a solid base of knowledge on how a conversion model of a fuel bed, using Computational Fluid Dynamics (CFD), needs to be structured and solved. Most existing models, however, handle the conversion in one single dimension of constant bed properties; when observing a burning fuel bed in a grate furnace it becomes apparent that the fuel bed is neither homogeneous nor uni-dimensional. In this study, a two-dimensional model of the combustion of fixed fuel beds has been developed for the purpose of studying the influence of heterogeneous fuel-bed properties on the conversion. In the model, the available experience from fuel-bed modelling by means of the sub-models for fixed-bed conversion was structured into a fluid-flow scale and into a fuel-particle scale, in which new formulations describing the shrinkage of the fuel bed on a multi-particle scale was introduced. Both available and new sub-models were introduced into a pre-existing CFD-platform, in which the framework for simulating fluid flow in porous media was used to solve also the conversion related processes acting within the particle scales as well as within the multi-particle scales. The complete model was validated with good correspondence between available measurements of temperature and species concentration in a wood-char combustor. In addition, the modelled shrinkage was found to well describe the observed shrinkage of the fuel bed in a combustion experiment. Results of model simulations by using heterogeneous bed porosity show that a porous passage through the bed risks causing channelling in the fuel bed – a phenomenon common in modern grate furnaces and suspected to cause increased emissions of nitric oxides and unburned carbon compounds. The channelling tendency could, however, to a large extent be reduced by grates of higher flow resistance. The natural porosity increase attributable to the packing of particles onto a wall was shown to concentrate combustion disturbances close to the surface of the grate. Thus, larger changes in the porosity than caused by natural fuel packing against a wall are needed to give rise to channels that emerge through the fuel bed. 相似文献
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