热风炉换热系统的热工特性

介绍了干燥热风炉的概念,分析了热风炉的设计现状。通过与加热炉的对比,阐述了热风炉操作参数的特点;基于换热器在热风炉上不可替代的地位,从热工理论出发,分析指出了热风炉用换热器与余热利用换热器的主要区别。     

基于模板的生菜参数化几何建模方法

为了对生菜进行快速三维重构,本文将逆向工程的思想引入到生菜几何建模中来,提出了一种基于参数模板的生菜几何建模方法。借助三维扫描设备构造具有多分辨率的生菜器官模板,分析生菜植株形态结构特征,提取特征参数,进而通过形态参数对模板进行控制,并最终组装成为参数化的生菜几何模型。实验结果表明,该方法可以快速、便捷地重构出具有较高真实感的生菜几何模型,对曲面难以构造的植物器官及植株几何建模具有一定的参考意义。     

基于空气源热泵技术的三段五步式烤烟需热特性分析研究

烟叶烘烤过程中需热特性的准确计算分析是设计热泵式烟叶烤房的基本条件。以热泵加热式烟叶烤房为研究基础,通过对烟叶烘烤过程中传热传质过程进行计算分析,得出烟叶烘烤过程中热负荷随烘烤时间的变化曲线。进而采用焓差法对热泵加热装置的制热量进行了试验测试,得出了烟叶烘烤过程中热泵加热装置制热量随烘烤时间的变化曲线。经对比分析,实际制热量曲线和理论热负荷曲线有很好的一致性,验证了该分析方法的准确性,对热泵加热式烟叶烤房的设计具有一定参考意义。     

CTHL-0.5型移动式多用途粮食干燥机

CTHL－０．５型移动式多用途粮食干燥机是农业部规划设计研究院研制的最新产品。该机保留了一般粮食干燥机的特性，对干燥机的结构、配套设备及功能进行了重新设计，适用于粮食产地的专业户或种粮大户对玉米、小麦、大豆和稻谷等进行干燥处理，还可用于干燥饲料、种子和食品等物料。该机由干燥塔、热风炉、引烟机、排粮搅龙、提升机、电控柜和车架等组成（见图１），它有以下特点：①采用了以农作物秸秆为燃料的间接换热热风炉为热源；②对传统的混流干燥工艺进行了改进，具有多种功能，适合于各种粒径的作物干燥，实现了一机多用；③整机…     

草莓三维形态几何建模与真实感绘制

为了实现草莓形态结构的三维可视化模拟,本文提出了一种基于球B-样条的草莓器官几何建模方法,通过对草莓形态结构的观测分析,分别创建草莓茎、叶片、单花和果实等主要器官的几何模型,并提取了具有明确农学意义的几何模型参数;同时利用模板与纹理贴图等真实感渲染技术描述了草莓植株的局部细节特征,增加了模型的真实感。本文提出的草莓三维形态建模方法易于与农业知识结合,且重构的形态模型具有较好的真实感效果,为草莓三维形态的交互设计和形态模拟提供了可用的方法和手段。     

Caxa三维实体在精少量谷子播种器设计中的应用

介绍了应用Caxa三维实体软件进行播种机的三维建模设计过程,探讨了设计过程中的技术要点,为谷子播种机的改型设计、系列化设计奠定了基础,同时,为Caxa软件在其它方面设计上的应用提供了参考和借鉴。     

农用小型移动式谷物干燥机的设计

阐述以秸秆为燃料的农用小型移动式谷物干燥机研究的背景和意义,分析该干燥机主要结构和工作原理,并对干燥塔和热风炉等主要部件进行设计计算,确定合理的结构参数与工作参数。样机性能试验表明,该干燥机能满足谷物干燥要求,而且操作方便,适合农户使用。     

水稻叶曲线特征的机理模型

通过对水稻叶片的受力分析，推导了叶曲线方程，并进行了影响系数的参数化和方程求解。对叶曲线方程的灵敏度分析表明，方程较好地体现了叶长、叶宽、叶形、比叶重和叶片形变系数等参数对叶曲线的综合影响，与生产中水稻株型特征变化相一致。进一步利用三维数字化仪获得的不同品种类型水稻拔节期和孕穗期叶脉空间坐标试验数据对叶曲线方程进行了模拟分析，结果表明叶曲线方程可以合理而可靠地定量描述水稻叶曲线特征的动态变化规律。     

基于SolidWorks的采棉机摘锭的三维虚拟建模及有限元分析

运用SolidWorks软件对采棉机摘锭进行三维虚拟建模,并利用软件中的COSMOSXpress分析程序对摘锭的径向受力和扭矩进行有限元分析,并对摘锭的材质、约束、载荷进行设定,通过分析结果对设计进行优化和改进,在确定材料的环境中优化尺寸参数,精确分析各零件的相对位置及运动状态,为加工工艺的分析提供良好的基础。     

换向分层式小型谷物干燥机的设计

阐述了一种能应用于广大农村地区,特别是南方农村地区的小型谷物干燥机,并对干燥箱、换向机构和热风炉等主要部件进行了设计计算,确定了合理的结构参数与工作参数。样机性能试验表明,该机干燥稻谷的处理批量为2t/批,每批干燥时间约10h,稻谷干燥成本约0.025元/kg。该机适用于一般谷物,或荔枝、龙眼、八角,以及可切成块状的农副产品如木薯和中药材等的干燥作业。     

Predicting System of Hot Metal Silicon Content in Blast Furnace

Hot metal silicon content in blast furnace is a main parameter by which product quality is measured and energy utilization ratio of blast furnace is reflected.The precise predicted results of hot metal silicon content can be used to direct batch operation and smelting operation of blast furnace.And the purpose of reducing hot metal silicon content is realized.The equations of thermodynamics and dynamics were deduced based on the reduction mechanism of silicon. And the predicting model of hot metal silicon content was obtained.With this model and the calculation methods of blast furnace's materiel and energy balance,the predicting system of hot metal silicon content was programmed.Real materiel conditions and operation parameters wre inputted into the system.And predicted values of hot metal silicon content were gained.Compared with measured values the deviations of predicted values were small.So it is testified that this predicting system has credibility in practice.     

300 MW CFB Boiler Fan Inverter Energy Saving and Safety Analysis

By the wind turbine design, start and stop, control, operation and other aspects of analysis, and combined with the actual production,the double leg double furnace structure of 300MW CFB boiler one or two fan energy-saving plan had be selected. By compari     

Assessment of Indoor Thermal Comfort for Low Energy Consumption Buildings

A model for indoor thermal comfort assessment was investigated in this paper. By using this model, the indoor thermal comfort of low energy consumption buildingwith buried pipe system was evaluated. The result shows that the buried pipe ventilationcan improve indoor thermal comfort in hot climates.     

ALYSTS OF THREE-FLUID SEPARATE TYPE HEAT PIPE EXCHANGER

An analytical model for the separate type heat pipe exchanger with three different fluids is presented. A univeral basic temperature transfer matrix equation can be applied to predict the heat transfer performance of parallel-or counter-flow in which heat is transfered between one hot fluid and two cold fluids or between two hot fluids and one cold fluid. The calculation of a real engineering example proves the proposal model to be reliable.     

Experiment of the Influence of Manganese Oxide on the Prosperities of High Alumina Content BF Slag

Alumina content in Nanjing Steel blast furnace slag is up to 19%, which results in worse slag fluidity, higher furnace operating temperature and higher silicon content of hot metal. Therefore blast furnace strengthening is reduced. Aiming at this problem, an by laboratory experiments the viscosity of simulating Nanjing Steel BF slag samples are measured after adding MnO, which are made up of analytically pure chemical reagents. And according to the experimental results, the influence of MnO on the properties of high alumina content BF slag is analyzed and the methods of reducing silicon content of hot metal in Nanjing Steel is educed. The results showed that the addition of MnO in high Al2O3 content slag has stronger effects on viscosity decreasing, and the decreasing of slag viscosity would make it possible to reduce the operating temperature of the blast furnace, which would result in decreasing of silicon content of hot metal.     

油辣椒自动灌装机弯曲灌装管道的流场模拟分析

以油辣椒固液两相流体为研究内容,以两种弯管模型为对象,利用多相流混合模型分别对不同入口流速(1、3、5 m/s)的油辣椒制品灌装管道流场进行模拟,并分析其弯管内固液两相流的速度场和密度场分布情况。结果表明,管道几何弯曲程度对流速有较大影响;提升灌装速度,可以减少油制辣椒的沉降,但作用不大;几何弯曲程度大的管道沉降现象较为严重,应注意合理截取管道长度。研究可为优化油辣椒灌装管道设计提供一定的理论依据。     

Wind Damage Estimation and Prediction of Light Steel Industrial Buildings

Wind hazard damage estimation was addressed for light steel industrial buildings which were the typical wind vulnerable structures in southeast coastal cities. With parametric analysis of wind damage and the structural failure features, the envelop elements and the connecting elements were determined as the pivots of the damage analysis. Upon the consideration of the co effect of exterior wind pressure, wind induced internal pressure and windborne debris damage, a typhoon load model was proposed. And with the calculation method of the element resistance from the regulation, the procedure of the damage estimation was described and the damage classification of industrial buildings was specified with detailed indicators. Finally, the proposed method was approved with the actual data of typhoon CHANCHU (0601).     

system modeling and simulation of wind turbines

Wind turbines operate in harsh environment with transient and variable working conditions. As a result, wind turbines are complicated, nonlinear, uncertain systems. Modeling and analysis of these systems are crucial to their design. Based on MATLAB, a new dynamic simulation model of a stalled wind turbine was presented. The blade element momentum theory and the state space method were programmed into MATLAB/SIMULINK to calculate wind turbine aerodynamic performance. The generator was also modeled in MATLAB/SIMULINK, taking the coupling between the generator and the rotor speed into consideration. Based on the proposed MATLAB model, an analysis of a 600 kW wind turbine was carried out. The calculation values were compared with the measured data. The results indicate the correctness of the proposed MATLAB model. The simulation model can be applied to optimize design and control of stalled wind turbines.     

Modeling and realizing of integrated batch planning for steelmaking-continuous casting and hot strip rolling

An integrated batch planning mathematical model based on multi-object optimization is proposed to solve the orderly and efficient flow of material between different working stations in iron and steel enterprises, where production technology constraints, material variations and coupling between steelmaking-continuous casting and hot rolling are analyzed first. According to the requirements of the hot rolling steel strip contracts, the integrated batch planning is divided into sub-plans of rolling plan, casting plan and furnace plan which are independent and coupling to each other, forming rolling plan and furnace plan simultaneously to influence casting plan. Heuristic method based on modified co-evolutionary algorithm is advanced to resolve this problem. The results of simulation and analysis in an iron and steel plant for strip steel production shows that it is feasible to provide effective guidance for integrated batch plan making.     

Study on the Dearsenization of Hot Metal Using CaO Basis Fluxes

There is plenty of iron ore with arsenic in China. Because a proven dearsenization technique does not come into existence in now iron making and steel making processes and it is necessary for developing the dearsenization of hot metal technologics. A serial of dearsenization experiments are carried out on electric resistance heated furnace, it's found that arsenic in hot metal can be removed by CaO basis fluxes. X ray qualitative analysis of CaO basis slag after dearsenization revealed that the product of hot metal dearsenization with CaO slag is Ca 3As 2 and the dearsenization reaction is a reducing one. The thermodynamic conditions of dearsenization of hot metal using CaO basis fluxes are that the lower of oxygen fraction pressure of the system and [s] in hot metal, the higher of temperature of the system and basically of the slag, the dearsenization efficiency is better.