烟气性质对电除尘器气流分布影响的仿真研究

作者采用流体动力学仿真软件CFX对电除尘器内部含尘烟气的气流分布进行了数值仿真．分析了烟气性质对气流分布的影响。由于在模拟过程中考虑了烟气性质的影响．模拟结果更能反映电除尘器气流分布的实际情况。     

基于ANSYS的分级机主轴冷却系统的设计与分析

针对过热蒸汽气流磨在进行粉体加工时,高温的过热蒸汽会导致分级机主轴轴承温度高于额定工作温度,设计了一种能使分级机主轴有效降温的水冷却系统.以某型号的过热蒸汽分级机为原型建模,利用ANSYS软件,对其在自然冷却与所设计的水冷却系统下主轴系统的温度进行数值模拟分析,表明所设计的水冷却系统对分级机主轴系统具有良好的冷却效果.     

盐水冷却对S36950不锈钢力学性能的影响

为考察盐水冷却对S36950不锈钢高温后力学性能的影响,选取普通S30408不锈钢为参考对象进行了不同温度工况冷却后两类不锈钢的拉伸试验,获取高温盐水冷却后其力学性能指标(弹性模量、名义屈服强度、抗拉极限强度、断后伸长率等)的变化规律,与同类型钢材采用普通水冷却的既有高温后试验结果对比。结果表明,盐水冷却后两类不锈钢表观均出现了明显的腐蚀现象;盐水冷却使得两类不锈钢在敏化温度段(600～800℃)的高温后弹性模量与延伸率有所波动;采用盐水冷却的两类不锈钢高温后强度均较普通水冷有所下降,且S36950不锈钢的屈服与极限强度在800℃高温后下降显著。基于试验结果修正了既有不锈钢高温后本构模型,提高了其对盐水冷却的S36950不锈钢高温后应力-应变关系的预测精度。     

柴油加氢装置反应器进出口的管道设计

介绍了某炼油厂200万吨/年柴油加氢装置加氢反应器的平面布置、管道规划要点,并对其管道支吊架设计进行了阐述。然后使用应力分析软件CAESARII对反应器进出口的高温工艺管道的设计方案进行了计算并优化。并对设计中所遇到的问题进行了探讨,为今后类似装置的设计提供参考。     

设置汽轮机快速冷却装置的必要性分析

汽轮机快速冷却的几种方法及其优缺点 ,对设置快冷装置的汽轮机进行了热经济性和热冲击分析 ,说明了大型汽轮机采用快速冷却装置的必要性 .     

基于压差的并联冷却泵水流量模型

针对中央空调冷冻站中多台并联冷却泵流量检测困难的问题,依据流体水力特性,提出了一种基于压差的冷却泵水流量模型,并通过试验进行了验证,结果表明,流量模型与实际测试结果的相对误差范围为-10.43%~6.13%,可以较好地满足工程应用要求。研究结果可用于进一步分析空调并联冷却泵中单台泵的能效特性及联合运行策略等.     

线材冷却过程模拟计算的数学模型

建立了线材斯太尔摩冷却过程有内热源的一维非稳态数学模型;以CCT曲线为依据计算线材冷却过程的相变潜热,利用能量平衡法对数学模型进行离散求解,得出线材在冷却过程中搭接点与非搭接点处的温降规律,并通过现场测试验证了模拟计算结果的准确性.     

变压器冷却控制系统控制器的硬件设计

变压器的冷却装置是将变压器在运行中由损耗所产生的热量散发出去,以保证变压器可以安全正常的运行.本文主要是对其核心部分即对控制模块进行设计,其中包括了可以对主变压器风扇投入与切除的温度范围进行自行设定,也可以按照用户的要求而变化.     

基于有限元模型的流体管道应力应变特性仿真实验研究

通过测量管道外壁应力应变大小来间接获得管道内压力值在实际工程应用中具有重要意义。在理论分析的基础上,利用ANSYS Workbench分析软件,建立管道的壁厚、长度、内径和材质等参数各异的多种有限元仿真模型,详细分析管道在内压作用下,管壁的应力应变特性。仿真结果表明,管壁应力应变与管道内压和内径大小成线性关系、与壁厚成非线性关系、且与管道长度无关,此外,对于相同管道内压,管壁应变随管道材质不同而变化,但管壁应力却不受影响。该仿真实验的设计与研究为后续的传感器研制和非接触管内压力测量提供了坚实的理论基础和必要的数据支撑。     

热轧带钢层流冷却仿真系统研究

文章介绍了攀钢1 450 mm热轧带钢层流冷却仿真系统的开发过程及在实际中的应用。该仿真系统是基于VC 6.0开发的,具有速度快、精度高、适应性强的特点;具有读取数据而生成带钢层流冷却温降曲线和显示集管组态的功能。其生成的温降曲线和集管组态可为现场生产和新产品开发提供可行性依据。     

热轧钢带冷却过程建模及自动控制研究

通过研究热轧钢带的冷却过程,对其温度的变换进行了建模分析。根据所建立了数学模型,提出了基于反馈控制原理的温度控制方案,给出了反馈卷取温度控制的详细控制过程,最后结合实际的工作特点,对模型进行了分析与修正。     

多功能大尺寸真三轴储层改造实验装置的开发与应用

储层改造技术是目前实现低渗透和非常规油气藏及中深层地热资源高效开采的核心技术。为更好地满足储层改造技术的教学科研工作需求,自主设计了多功能大尺寸真三轴储层改造实验装置,创新性地实现了针对不同尺寸人造或露头岩心,不同温度、围压和孔压,不同流量的固液两相泵入,以及不同井筒完井工艺条件下的储层改造及渗流模拟实验,提供了主/被动声波结合的声发射检测、温压场和应力应变场检测及压后激光扫描测量等丰富的评价手段。该装置具备功能丰富、操作简便安全、性价比高的突出特点,有助于构建储层改造技术创新实践平台,提升教学科研水平,助推师生创新发展。     

Mathematical model for cooling process and its self-learning applied in hot rolling mill

Control precision of coiling temperature is one of the key factors affecting the profile shape and surface quality during the cooling process of hot rolled steel strip. For this reason, the core of temperature control precision is to establish an effective cooling mathematical model with self-learning function. Starting from this point, a cooling mathematical model with nonlinear structural characteristics is established in this paper for the cooling process of hot rolled steel strip. By the analysis of self-learning ability, key parameters of the mathematical model could be constantly corrected so as to improve temperature control precision and adaptive capability of the model. The site actual application results proved the stable performance and high control precision of the proposed mathematical model, which would lay a solid foundation to improve the steel product qualities.     

不同位置辐射板的供冷性能分析

分析了辐射板布置位置对供冷性能的影响,建立了一种对流与辐射耦合的CFD模拟模型.通过模拟计算,得到不同辐射板位置和室内热源状况下辐射板供冷能力及室内热环境的分布状况;该模拟结果与真实平台实验结果基本吻合.模拟结果表明：当室内热源温度较低时,对流换热量为主导因素,因此应将辐射板放置于侧墙或天花板处;当室内热源温度较高时,辐射板与热源的辐射换热量增大,辐射换热量为主导因素,因此应将辐射板布置在靠近高温热源的位置.     

Simulation and experimental study on hydraulic driving fan cooling system for construction machinery working on plateau

Overheating of the engine, the transmission and the hydraulic device is a problem when the construction machinery works on plateau. To solve this problem, we proposed an electro-controlled hydraulic driving fan cooling system （ECHDFCS）. The system was applied to a 50-wheel loader. We carried out the coolant temperature simulation using fluid modeling software FLOWMASTER, followed by laboratory experiments and road tests. The results show that ECHDFCS can adjust the cooling capability of the system automatically based on machine heat dissipation requirements. The coolant temperature is consequently remained within an appropriate range. The simulation results are consistent with the experiment results when the experiment is performed on the plain, but are different from the road tests in some investigated parameters on the plateau.     

油气全自动燃烧教学实验装置研制

设计制造了工业燃烧技术和加热炉技术的教学实验与科研装置,主要包括水套加热炉、燃油及燃气全自动燃烧机、烟气分析仪等。由全自动燃烧机为水套炉提供热源,通过燃烧室外侧水套及管式换热器,将热量传递给循环水,出口烟气温度为70~150℃;利用穿过水套的测量孔,测量燃烧室的温度场、速度场、浓度场,在烟道出口测定烟气成分。利用该装置能够进行科学全面的燃烧技术的研究和评价,并已在教学实验中取得了很好的教学效果。     

Numerical Analysis of Influencing Factors on Temperature Field and Airflow Distribution of the Displacement Ventilation System

Indoor air quality and thermal comfort are important features of indoor environment, In this paper, a numerical simulation based on the k-ε model of CFD is used to analyze factors such as loading, exterior-protected construction, blowing-in rate that play an important role in the temperature field and airflow field of the displacement ventilation system. Exterior-protected construction has little influence on indoor temperature distribution of displacement ventilation systems and the influence is limited only in a small area near the external wall when the indoor heat source is the main cooling load. The height of a room has little influence on indoor temperature field, and the temperature gradient of active region is basically unchanged. In the system combined with a displacement ventilation system and a cooling system, the height also has little influence. When the cooling load is high,the indoor heat source creates a strong convective plume, which will make the average indoor air age lower, the ventilation efficiency higher and the elimination of pollutant easier. Air supply rate plays an important role in displacement ventilation systems. The increase of air supply rate that can be realized by increasing the air supply velocity and enlarging the area of air inlet will increase the mass capability of the system and diminish the vertical temperature gradient. From the comparison between simulations and experiments, it is concluded that this simulation are creditable.     

Removal of PCDDs/Fs from municipal solid waste incineration by entrained-flow adsorption technology

INTRODUCTION Polychlorinated dibenzodioxins and poly- chlorinated dibenzofurans (PCDDs/Fs) are some major toxic substances unintentionally produced mainly from municipal solid waste incineration (MSWI). Attention has been focused on the best way for controlling and regulating such emissions. Among flue gas treatment technologies for post combustion zone emission control (Buekens and Huang, 1998; McKay, 2002), activated carbon adsorption (ACA) and techniques involving physical adsorp…     

一种基于PLC的烟气脱硫监控系统的研究与实现

设计了一种烟气脱硫监控系统:采用湿式石灰石烟气脱硫工艺作为系统脱硫控制方案;硬件方面采用PLC作为监控系统的下位机,采集实时数据与控制现场设备;将工控机作为上位机,通过组态软件实现对下位机的实时监控。经实验室调试证明:此监控系统实现了运行参数与数据的实时监控,具有控制简单、界面友好、维护性好等特点。