共查询到16条相似文献,搜索用时 297 毫秒
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为降低某公司烧结机干法脱硫装置烟道阻力,减少引风机出力,实现节能优化,运用计算流体力学软件,对引风机出口烟道内流场进行三维数值模拟,并根据分析结果进行烟道的优化改造。改造后,吸收塔入口负压由-200Pa提升至-560Pa,风机电流由328A降为301.4A,节能降耗显著。 相似文献
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旋转压缩机油路系统仿真与试验研究 总被引:1,自引:0,他引:1
压缩机泵油系统对滚动转子压缩机性能和可靠性非常重要.为了了解压缩机泵油特性.本文应用CFD软件,采用VOF模型对滚动转子压缩机整个泵油系统进行数值模拟,搭建试验台进行试验,并将模拟和试验结果进行对比,结果表明上法兰螺旋槽处润滑油流量结果吻合很好,误差在10%以内,证明了该仿真方法的可行性. 相似文献
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SCR脱硝装置中整流格栅的优化设计 总被引:1,自引:0,他引:1
基于CFD模拟软件对某选择性催化还原(SCR)脱硝装置进行数值模拟,分析了不同整流格栅间距、形式对反应器上部流场的影响。以不同高度截面的烟气速度变异系数CV和最大烟气入射角为定量评价指标,给出了满足性能要求的整流格栅设计参数范围以及最优设计方案。 相似文献
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《中国环保产业》2019,(8)
由于部分火电厂燃煤锅炉采用低氮改造+SNCR或SCR脱硝技术的氮氧化物排放浓度达不到现行超低排放标准,因此就必须采用脱硝效率更高的SCR脱硝技术对原有系统进行改造,由于SCR对烟气温度的要求和厂区场地限制,SCR脱硝系统烟气的引出和接入位置空间狭小(2~4m),进出烟道甚至要共用烟道壁板,这样就产生烟气偏流和烟道内积灰现象。文章首先以某燃煤锅炉烟气脱硝工程的直角弯头改造为研究对象,采用FLUENT数值模拟方法研究直角弯头烟气的流动分布,在此基础上,对导流板进行优化设计,直角弯头在改造前积灰严重,影响锅炉工况,经改造后积灰状况得到极大改善,保证了系统正常运行。 相似文献
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计算流体动力学(CFD)技术可以实现分析、判断和预测天然气泄漏后所影响到的扩散区域,对事故的预防、控制以及平台应急、逃生方面具有指导意义。文章介绍了CFD方法以及可燃气体泄漏的相关理论,并对海洋平台可燃气体泄漏进行模拟分析,研究结果可为泄漏现场人员疏散和安全技术管理提供有效依据。 相似文献
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以某新建460t/h煤粉炉的SCR脱硝项目为例,基于CFD软件完成几何建模、网格划分、数值计算等模拟工作,分析SCR脱硝系统的速度分布、NH3浓度分布、烟气入射角及压损情况。结果显示:最终的导流板布置方案能达到比较理想的流场分布,脱硝系统满足各项性能指标要求。 相似文献
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M. Gharebaghi R.M.A. Irons L. Ma M. Pourkashanian A. Pranzitelli 《International Journal of Greenhouse Gas Control》2011
Oxy-fuel combustion is considered as one of the most promising technologies for carbon capture and storage (CCS). In this study, a commercial computational fluid dynamics (CFD) code has been employed for the simulation of an air-fired coal combustion and an oxy-fired coal combustion with recycled flue gas in a 1 MWth combustion test facility. Reynolds–averaged Navier–Stokes (RANS) solutions have been obtained for both cases. Results indicate that the CFD code with existing physical sub-models can provide a reasonable prediction for the air-fired combustion. However, the prediction for the oxy-fired case has not been as satisfactory as expected. In order to assess the impact of the turbulence treatment in CFD on the predictions, large eddy simulation (LES) has been performed for oxy-fired case and compared with the results from the RANS simulation and the available experimental data. Although the results suggest that LES can provide a more realistic prediction of the shape and the physical properties of the flame, there has not been significant improvement in the prediction of the temperature. In addition, the complexity of the problem requires more detailed experimental data for the validation of the LES. In order to improve the validity of numerical simulations for design purposes, further modelling improvements for oxy-coal combustion that are necessary for more accurate predictions are addressed. Based on this study, it is envisaged that the complexity in the oxy-coal combustion process requires more detailed analyses of the available physical sub-models. 相似文献
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Valentin Becher Jan-Peter Bohn Pedro Dias Hartmut Spliethoff 《International Journal of Greenhouse Gas Control》2011
Combustion of hydrocarbon fuels with pure oxygen results in a different flue gas composition as combustion with air. Standard CFD spectral gas radiation models for air blown combustion are out of their validity range. The series of three articles provides a common spectral basis for the validation of new developed models. Part B of the series presents spectral measurements in the spectral range of 2.4–5.4 μm of a 70 kW turbulent natural gas flame in air blown combustion and in wet and dry oxyfuel combustion. The experimentally measured intensity spectra were compared with simulated spectra based on measured gas atmospheres. The line-by-line database HITEMP2010 and the two statistical-narrow-band models EM2C and RADCAL were used for the numerical simulation. The measured spectra showed large fluctuations due to turbulence. The up to 75% increased averaged experimental intensity compared to the simulated intensity pointed out the importance of the effect of turbulence-radiation-interaction in combustion simulations. 相似文献