远红外线加热干燥在硫酸锰生产上的应用

远红外线加热干燥是近年来发展起来的一门新技术,它具有高效、优质、节能等优点。我国近年来在食品、油漆、玻璃器皿、砂型砂芯、木材等加工工业上已先后开始应用。但在锰盐生产上的应用到目前为止还没有先例。当前常用的远红外线辐射源,有金属电热管类型的远红外辐射加热器,有碳化硅板辐射加热器,也有在不锈钢带或镍铬带上直接涂以远红外涂层来作为辐射源的。远红外线干燥炉的炉型很多,根据物件传递方式可     

远红外加热技术在化工防腐上的应用

一、序言远红外线加热干燥是近年来发展起来的一项新技术,它是利用远红外辐射元件发出的远红外线被加热物体所吸收,直接转变为热能而达到干燥的目的。目前国内不少行业都已采用远红外线来加热干燥各种原材料,     

陶瓷材料的远红外辐射特性及其应用

一、引言远红外辐射加热技术我国在七十年代就开始了大量的研究,由于远红外线具有穿透物质的能力,使被加热物质内部同时得到热量,并且容易被物质所吸收,所以利用远红外线加热干燥具有热利用率高、速度快等优点。在我国工农业生产中已经得到广泛的应用。红外线是介于可见光和微波之间,波长在0.72～1000μm 范围内的一种电磁波。一般把波长在4～1000μm 区域的红外线称为远红外线(或称长波段),0.72～4μm 之间称为近红外     

用远红外技术测量煤气炉炉温

介绍一种可连续测量炉温、简便省工、快速有效非接触的远红外技术测量煤气炉炉温的方法。测量原理:利用远红外技术把氧化层燃烧气化放射出各种辐射线(包括可见光、部分紫外线、近红外线)都转变为远红外线去加热“热电偶”产生热电流,经过放大,就可测量煤气炉氧化层温度。远红外线比近红外线有较高的辐射能量,较大的波段宽度,能量利用率也高。许多物质对吸收远红外线比吸收近红外线更强烈。远红外线产生的热效应最高,产生的热电流最大。     

远红外电加热器在变换触媒升温还原中的应用

一、前言远红外加热具有耗电少、效率高、投资省等优点。远红外加热是辐射加热的一种,它是以电磁波的形式,将热量直接辐射至需要加热的物质。合成氨生产中的气体,如NH_3、CO、CO_2、蒸汽等物质均能较好地吸收远红外线,引起其基本粒子的谐振运动,使电磁波所载运的辐射能部分地或大部分地被吸收,转为其内部基本粒子微观运动的动能—即热量,使物体(气体)发热。我们将120千瓦的电加热器结构内的电     

热固性塑料坯料远红外烘干炉

远红外加热干燥是利用远红外辐射元件辐射出的远红外线,被加热物体所吸收直接转变为热能而达到干燥的目的。这种干燥方法具有高效快干、节约能源、烘道占地少、干燥质量好等优点。我们将远红外加热干燥应用于热固性酚醛玻纤增强塑料坯料的烘干,经生产实践证明,效果良好。     

应用远红外技术固化玻璃钢制品

远红外加热干燥技术是七十年代发展起来的一项新技术。它是介于可见光与微波之间波长为0.27～1000微米的一种电磁波。远红外加热干燥技术是利用远红外辐射器发出的远红外线照射被加热物体,远红外线的能量为被加热物体所吸收,并直接转变为热能而使物体达到加热干燥的目的。远红外加热是辐射加热,具有效率高,加热速度快,加热均匀,按装简便,占地面积小和耗电少等特点。因此,在国外都得到飞速的发展,被广泛     

电气石远红外辐射对水表面张力的影响

用固液分置法排除电气石自发电场对水的影响,研究了极性晶体电气石辐射的远红外线对水表面张力的影响规律.结果表明:电气石辐射的远红外线作用于水分子产生共振,可削弱水分子间氢键作用,从而使水表面张力降低.室温时,当电气石粉体的中位粒径(D50)为4.0～6.5 μm时,随着电气石辐射远红外线对水作用时间延长,水的表面张力逐渐降低.D50为4.0 μm,电气石粉体与水的质量比[m(t)/m(w)]不低于0.5时,随着辐射时间的延长水表面张力明显降低.D50为6.5 μm,m(t)/m(w)为0.5时,水表面张力由初始值72.571 mN/m降为72.049 mN/m.     

锆英砂质远红外线辐射加热器的结构性能及其应用

远红外线辐射加热器是近年发展起来的一项新技术,用它加热干燥有机物质,具有效率高、节约电能、缩小炉体,产品质量好、使用安全、维修方便等优点。国内外应用越来越广泛。目前使用的有金属管类型、碳化硅板管型、锆英砂板管型等。为配合推     

采用远红外加热技术干燥聚酯切片

介绍了采用远红外线加热干燥含水切片的试验过程,分析了此项技术的可行性。通过试验测试了不同的加热温度、料板距离和干燥时间对干燥后切片含水率的影响。试验结果表明,采用远红外线加热干燥后的切片含水率是可以达到螺杆挤压机纺制聚酯短纤维和熔喷非织造布的工艺条件和技术要求的,从而扩大了远红外线的应用范围。     

Selective Far Infrared Heating System—Spectral Manipulation. II

Spectral manipulation of infrared radiation for selective heating of food components was done using a far infrared (FIR) heating system. The incident FIR radiation was controlled in the specific spectral regions using three bandpass optical filters in ranges of 2.5-2.96 µm (filter A), 3.15-3.67 µm (filter B), and 5.45-12.23 µm (filter C). Pure soybean protein and starch powder were used to test the validity of the selective IR heating system in the three different bandpass ranges. Based on the heat flux ratio between soy protein and starch, in relation to the applied spectral conditions, a simulation model was developed and validated.     

远红外线在塑料板材热成型中的应用

本文以聚氯乙烯板材的热成型为例，通过对使用的加热元件作一简单的改进，采用远红外线加热不但可以节约大量的能源，高效快速，而且还可以提高产品质量。实践证明，这种做法简单易行，因而具有普遍的应用价值。     

Selective Far Infrared Heating System—Design and Evaluation. I

A novel far infrared (FIR) heating system was designed for selective heating of food powders such as soy protein and glucose. The FIR heating system consists of six ceramic lamps, a cone-shaped waveguide, and an optical band pass filter selected according to the spectral absorptivities of the chosen protein and glucose systems. A bandpass filter was used for differential heating of food components primarily due to their selective absorptivities. Selective heating of the two powders showed that protein, with an IR absorption range between 6 and 11 µm could be heated up to 6°C more in 5 min with the filter, compared to normal heating, when glucose temperature was higher than protein. Numerical analysis based on the different absorptivities of powders verified that the simulation results were very close to the experimental data with a maximum percentage error of 8.3%, confirming the feasibility of the heating system.     

Convective and radiant (IR) curing of bulk and waterborne epoxy coatings as thin layers. Part II: Infrared curing

In the first part of this paper, a method for studying the curing of 100-μm-thick epoxy-based layers on steel substrates was described. In this second part, we extend our study to radiative (infrared) heating conditions. A simple waterborne epoxy reactive system based on a diglycidylether of bisphenol-A prepolymer and a polyether triamine was used. The chemical kinetics during infrared heating were studied with the reaction kinetics recorded during convective heating. A second order autocatalytic model described the data. The curing mode had no significant influence on the heating kinetics but the heating rate had a significant influence on the curing kinetics. Higher heating rates can be achieved by infrared heating conditions compared with convective heating. The gelation phenomenon was changed for infrared conditions. Microdielectrometry can be used to record in situ the extent of reaction of the epoxy reactive system for thin layers during radiant heating.     

Experimental investigation of infrared rapid surface heating for injection molding

A low cost and practical infrared rapid surface heating system for injection molding is designed and investigated. The system was designed to assemble on the mold and a control system was used to operate the motion of the lamp holder. Four infrared halogen lamps (1 kW each) were used as the radiative source to heat the surface of mold insert. The temperature increase is verified on the mold plate with a thermal video system. Two types of specular reflectors combined with different bulb configurations were applied to study the heating ability of radiation heating. A modified spiral flow mold was used to test the enhancing filling ability of the rapid surface heating system. Three resins, PP, PMMA and PC were molded in the spiral flow injection molding experiments. If spherical reflector and centralized lamp configuration are used, the temperature at the center of the mold surface is the highest. The temperature of mold center surface is raised from 83°C to 188°C with 15 s of infrared heating. Because the surface temperature of the mold insert is higher than the glass transition temperature of resins before filling, the flow distance of resins in the modified spiral flow mold will be increased. The location effect of the infrared surface heating system on a thin‐long cavity was studied to demonstrate the possibility of using smaller infrared heating area on a large mold surface. A microprobe cavity also demonstrated that with the assistance of infrared heating technology the formability of a microprobe can be greatly improved. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3704–3713, 2006     

Experimental study on tire fire penetration into a motorcoach passenger compartment

Two full‐scale fire experiments were conducted to determine the mode of penetration of a tire fire into the passenger compartment of a motorcoach. A special burner was designed to imitate the frictional heating of hub and wheel metal caused by failed axle bearings, locked brakes, or dragged blown tires. For the first experiment, heating to obtain tire ignition was initiated on the exterior of the passenger side tag axle wheel and for the second, on the exterior of the passenger side drive axle wheel. Measurements of interior and exterior temperatures, interior heat flux, and heat release rate were performed. Standard and infrared videos and still photographs were recorded. Both experiments showed that the tire fires ignited the plastic fender and glass‐reinforced plastic exterior side panel (below the windows) upon which the fires spread quickly and penetrated the passenger compartment by breaking the windows. Measurements showed that other potential fire penetration routes (flooring and lavatory) lagged far behind the windows in heating and degradation. Copyright © 2012 John Wiley & Sons, Ltd.     

远红外聚酯的研制

分析了远红外聚酯的国内外研制现状 ,指出当今国内远红外聚酯生产过程中普遍存在陶瓷粉对聚酯的相容性差、分散性差、远红外聚酯的过滤性能和流变性能差等问题。通过对陶瓷粉进行表面处理和降低聚酯熔点等途径 ,可明显改善远红外聚酯的可纺性。     

高效远红外辐射陶瓷的研究现状及应用

介绍了远红外陶瓷材料发射辐射的机理。阐述了远红外辐射陶瓷(粉)的组成及制备方法。着重论述了烧结温度和烧结助剂对远红外陶瓷性能的影响。并对远红外陶瓷的一些主要应用做了介绍。提出远红外技术今后的研究重点应放在远红外辐射材料及陶瓷的研发上。     

Additive manufacturing of barium titanate based ceramic heaters with positive temperature coefficient of resistance (PTCR)

Lanthanum/manganese doped barium titanate (BT) based PTCR functional heater elements/structures were fabricated with desirable electrical properties for the first time using Additive Manufacturing (AM). 3D printed components of varying size and shape and prototype honeycomb lattices with high density were achieved through AM. Aqueous, less organic containing (2.5 wt% additives versus 10–30 wt% added typically), eco-friendly ink formulations were developed with suitable rheological properties for 3D printing. For BT prints, the sintered densities of the 3D ceramic parts were found to be >99% TD, highest reported value so far. The microstructure, electrical properties and heating characteristics of the printed PTCR components were studied in detail and their thermal stability evaluated using infrared imaging and benchmarked against commercial PTCR heating element. The heating behaviour of the solid and porous 3D printed components was demonstrated to be similar, paving the way for light weight (?47% reduction in weight) heaters suitable for automotive/aerospace applications and less materials wastage during device fabrication.     

降温母粒对远红外PP纤维可纺性及结构的影响

着重探讨了降温母粒对远红外 PP共混体系熔融指数、熔点、流变性等的影响 ,研究了降温母粒对高速纺远红外细旦丙纶纺程上结晶、取向等结构形成的影响。结果表明 :在远红外 PP共混体系中添加 3 %的降温母粒 ,可改善流动性能 ,降低纺丝温度 ,大大改善体系的可纺性 ,可满足高速纺丝的要求 ,所得 POY的超分子结构有利于进一步的后加工处理