低温明火炉内钢板加热温度的均匀性实验研究

为研究低温回火热处理炉加热的温度均匀性,搭建低温明火炉实验平台,在实验炉内采用高速烧嘴脉冲燃烧加热,获得了实测的炉膛温度分布和炉内钢板表面温度,试验结果表明在合理布置炉内烧嘴和合理的供热方式条件下,不采用循环风机也可满足炉内钢板加热温度均匀性要求。     

基于串级PID的相变储能电锅炉温度控制技术

针对相变储能电锅炉温度控制系统具有大惯性、大滞后的特性,提出了一种基于串级PID的温度控制方法。通过控制循环风机风量控制电锅炉的出水温度,串级控制系统副回路根据储能材料模块处进风温度与出风温度的温差变化调节循环风机风量进行粗调;主回路根据换热器一次侧出风温度与进风温度的温差变化调节循环风机风量进行细调,使电锅炉出水温度达到目标值。其中主调节器采用了PID控制,副调节器采用了P控制。利用MATLAB/Simulink软件进行仿真,结果表明本文提出的控制方法能够实现对电锅炉出水温度的稳定控制,并具有一定的抗干扰能力。     

强制炉气循环电炉风量的计算

强制炉气循环电炉一般用于加热铝镁合金构件等工件要求温度均匀性较高、且炉温较低，以对流传热为主的场合。这类电炉设计的主要问题是确定风机的风量、风压及合理组织炉内气流的循环。详细地进行了风量的理论计算，并实际应用。     

微波热风技术在艾萨炉电收尘中的半工业化研究

针对云南某厂艾萨炉烟气电收尘设备对保温箱温度的技术要求,在前期小实验基础上进行半工业化试验,研究微波功率和初始微波加热体温度对保温箱平衡温度的影响。结果表明增大微波功率和初始微波加热体温度能显著提高保温箱平衡温度,在控制控制微波功率9 k W,微波加热体初始温度760℃的条件下,打开循环风机,风机电压220 V,风量为410 m3/h,经15 min传质换热后,保温箱温度达到258℃,高于云南某厂艾萨炉烟气露点温度,能满足工业应用需求。     

常规/大空燃比燃烧组合供热技术在低温回火炉的应用及效果

介绍了常规燃烧+大空燃比燃烧的组合供热技术在某钢企低温回火热处理炉上的应用及效果,当钢板在300℃以下低温回火时,采用大空燃比燃烧,配合组合脉冲控制策略,获得低温回火良好的温度均匀性。炉内设置强力循环搅拌风机,增大低温回火对流换热系数,提高产能。在300℃以上中高温回火时,采用常规燃烧,获得中高温回火良好的温度均匀性及足够的供热能力。该热处理炉投产后温度均匀性、能耗、产能等考核结果达到预期目标,证明该技术的应用是成功的。     

ADU凝胶球干燥设备的研制与应用

为解决ADU凝胶球在低温干燥过程中的温度不均匀、温度控制不准确，以及干燥过程中水分释放速率不均匀等难题，吸取国内外先进技术，结合电阻真空干燥设备的特点，提出了滚筒式干燥结构，实现ADU凝胶球批次连续生产。该设备方便实用、安全可靠、性能良好，设备主要由上料装置、加热炉体、出料装置、旋转装置、倾翻装置、真空系统和底座等组成，前期通过设备设计和建模验证等方式确定了该设备的最佳结构型式，后期在试验阶段，干燥效果达到了理想的工艺要求，炉温均匀性达到±5℃,符合ADU凝胶球加热均匀性的工艺要求，成功研制ADU凝胶球干燥设备，实现了设备产能提高和低温恒压干燥的目标。     

送风速度对高精度微纳磨床温度均匀度影响的模拟探究

高精度微纳磨床由于其高精度设备所要求的高温度场控制要求,温度场的均匀性将对微纳磨床加工的精度有着直接影响,而送风温度是控制温度场的关键。因此文中将着重通过FLUENT模拟送风速度对高精度微纳磨床的加工面温度场的影响,以期获得在微纳磨床运行过程中温度调节控制的一些运行建议。     

风机盘管加新风系统变水温节能研究

研究了在风机盘管加新风系统中冷水温度变化对末端空气处理设备换热能力、除湿能力以及冷水机组性能的影响;给出风机盘管加新风系统中室内热湿平衡方程,编制计算程序,通过计算实例,表明对于一般舒适性空调系统,采用变水温质调节能够满足室内温湿度要求,节能效果明显.     

热处理炉控制参数调节方法的技术探讨

热处理炉是热处理车间的必备设备,承担着物料热加工的各个环节,而过程控制器便是热处理炉的核心控制元件,对热处理炉的温度均匀性控制起着不可或缺的作用。由于生产过程中设备损耗、炉丝氧化等多种原因,热处理炉的炉温均匀性需要进行初始检测与周期性检测,以确保温度均匀性满足物料的生产要求,因此炉温均匀性测试对于设备温均性稳定至关重要,而检测过程的参数调节方法便是成功高效测试的关键。以经典PID参数调节为基础,提出了改进型参数调节方法(初始参数赋值法与自整定PI调节法),并进行实验验证且效果良好。通过改进型参数调节方法,将炉温均匀性检测的参数调节方法进行了系统化与便捷化,为检测人员提供了高效的参数调节指导。     

“V”型直接空冷凝汽器单元内部导流的数值研究

针对某直接空冷单元温度分布极不均匀的现象,运用FLUENT软件,在考虑环境风的情况下,对"V"型空冷单元风机出口加装不同数量的平直导流板进行数值研究。结果表明,风机出口加装平直导流板确能改善冷却空气流场和温度场,使翅片管束出口温度分布更均匀,且最高温度明显降低,改善了凝汽器的换热性能,在加装4块导流板时,翅片管束出口温度分布达到最佳,最高温度降到最低。     

Experimental investigation on the mechanism of variable fan speed control in Open cathode PEM fuel cell

This study aims to reveal the mechanism of variable fan speed control in Open cathode PEM fuel cell (OC-PEMFC) by the experiments, which analyze the effects of variable fan speed on the operating parameters under different fuel cell loads. The operating parameters are cell temperature, stack voltage, voltage uniformity, and parasitic power. The results reveal that the fan speed has strong effects on the operating parameters: (1) it affects the temperature distribution and overheats the middle cells of fuel cell stack, especially, when it operates at high power; (2) it affects the variation trend of the voltage under different loads; (3) it affects the voltage uniformity, which can be improved via forced convection; (4) it affects the system efficiency due to the parasitic load consumed by the fan. Considering the varying effects of these operating parameters on performance, durability and system efficiency under different fuel cell loads, the variable fan speed control should adapt the variation of fuel cell loads and weigh multiple operating parameters.     

Research on performance of liquid drive fan cooling system for hydrogen fuel cell forklift

Due to the large energy consumption as well as poor controllability and other problems, the traditional cooling system has not been able to adapt to the development needs of construction machinery with the continuous upgrading of emission regulations. This paper introduces a hydraulic driven fan cooling system based on pilot operated electro-hydraulic proportional valve. In order to make the whole machine quickly reach the temperature required in the best working condition when the construction machinery starts working, controlling the fan at a lower speed can reduce the heat dissipation and save energy. The electronic control system will adjust the motor speed in time when the temperature of the fluid rises, and control the temperature in the best temperature range required. A one-dimensional simulation model of this stepless speed control system is established to predict the parameter sensitivity of the electro-hydraulic proportional valve and the dynamic performance of the system. The simulation shows that the fan speed of the system can reach the required speed in only 5s at the extreme high temperature of 40 °C; the fan input power of the system accounts for 65% of the system input power at ?30 °C and reaches 80% at 40 °C. Three-dimensional simulation shows that the fan-front temperature-controlled cooling system for forklift truck has high heat dissipation efficiency and can be applied to other heavy machinery products.     

Incorporating fan control into air-conditioning systems to improve energy efficiency and transient response

Modern air-conditioners frequently incorporate variable-speed compressors and variable-opening expansion valves with feedback control to improve performance and power efficiency. Because making the fan speeds adjustable adds flexibility to the control design and thus can lead to further improvements in performance and efficiency, this paper proposes two control algorithms, respectively, incorporating the outdoor fan and the indoor fan as the additional control inputs for air-conditioning systems. Both of the control algorithms are designed based on a low-order, linear model obtained from system identification. The first algorithm, which modulates the outdoor fan speed, can reduce the steady state power consumption if the temperature difference between the condenser and the outdoor environment is controlled properly. The second algorithm, which adds one more degree of freedom to control by modulating the indoor fan speed, can improve the transient response because actuator saturations become less likely to occur. The two control algorithms are implemented on a split-type residential air-conditioner and their respective performance is validated experimentally.     

Development of a temperature-controlled car-seat system utilizing thermoelectric device

A thermoelectric device was used to control the temperature of the car-seat surface: the warm temperature in the summer and cold temperature in the winter. The characteristics of the thermoelectric device for the car-seat were analyzed in relation to the input voltage and output temperature of the device. To install the device inside the car-seat, an air conditioning system was designed, consisting of a fan and duct to regulate the warm side of the thermoelectric device. To analyze and control the temperature of the car-seat system, a mathematical model of the car-seat system is proposed, and a robust control algorithm based on the sliding mode control is applied, respectively. A portable control system implementing the sliding mode control algorithm was developed by using a one-chip microprocessor and power driving system. The good performance of the developed control system for the constructed car-seat system was validated by actual tests. The test results are presented.     

Air cooling strategy of power battery based on minimum energy consumption

针对目前电动汽车动力电池风冷散热能耗高、散热滞后的问题,提出一种基于最小能耗的动力电池风冷控制策略,根据车载导航系统预报的工况信息预测动力电池的未来温升,在满足动力电池散热需求的前提下以风机能耗最少为目标,运用分段式动态规划算法确定风机在未来路段的开启时机与最优风速。以添加了坡度信息的ARB02、HWFET和UDDSHDV的组合工况为测试工况,对动力电池未来温升的精度进行了硬件在环试验,得出实际路况试验温度与预报工况试验温度的最大差值为0.3℃,最大偏差率为0.7%。与其他两种控制策略进行了Fluent仿真对比,结果表明基于最小能耗控制策略下动力电池的最高温度为39.87℃,最大温差为1.1℃;风机能耗是全程开启型控制策略的77.2%,是温度开关型控制策略的53.7%。该策略能有效控制动力电池的温度且风机能耗最小。     

火电厂300 MW机组引风机变频改造

随着国家对"节能减排"工作要求越来越重视及国家节能发电调度的即将施行,机组的能源消耗指标已成为各发电厂研究的重点.江阴苏龙发电有限公司根据自身相关系统的特点.应用高压变频调速装置对引风机进行变频改造,取得了良好的综合效益.     

电厂锅炉风机的节能分析

从风机在电厂中的应用现状着手,分析了电厂风机的节能途径。通过对风机的几种变速装置的经济性分析,得出选用变频调速装置节能是非常有效的,同时也为其它风机行业高效率利用能源提供了相关依据。     

铝材退火炉的设计

本文对铝卷材退火炉设计中的几个主要技术参数进行了探讨,包括热工计算与热工控制,以及炉温均匀性和风速的选择。     

焊接波纹管式温控阀的设计和试验研究

针对风电机组润滑油冷却系统中传统橡胶囊式温控阀使用寿命短、综合运营成本居高不下等问题,设计、制造了焊接波纹管式温控阀,实验研究了其动作特性并进行了实际应用。风机齿轮箱润滑油冷却系统中,温控阀的调节行程长、稳定性要求高、使用环境恶劣,焊接波纹管结构的引入,既满足了温控阀的实际功能需求,又克服了传统囊式温控阀使用寿命低、性能不稳定等缺点。通过试验,合理设计了温控阀的调节弹簧参数,将其与焊接波纹管配合使用,满足了温控阀的复位调节需求。通过填充蜂窝铝材料强化了储蜡腔的内部导热能力,有效提高了焊接波纹管式温控阀的响应速度。实际挂机试验表明,焊接波纹管式温控阀能有效代替传统囊式温控阀,有效降低风机综合运营成本,可作为风机齿轮箱润滑油冷却系统技术改造方案推广使用。     

矿井风机智能化监控系统的研究与设计

井下通风关乎煤矿生产的安全,如何保证通风系统运行的持续性、稳定性、可靠性,是提高煤矿自动化与现代化水平的重要内容之一。设计了1套矿井风机智能化监控系统,通过对井下风机给风量、转速、轴温等运行状态的实时监测,将数据传输到井下微机处理器,并将其筛选处理传到地面监控室,从而实现风机的智能化监控、节能高效运行。通过井下风机智能监控系统,可有效延长风机的使用寿命,极大地提高煤矿的生产安全,对煤矿现代化建设具有很重要的意义。