燃烧辐射的研究与实践

炉内的辐射传热作用通常是由温度决定的，但因条件变化时辐射率与辐射特性便随其变化，故炉内辐射可人为地得到强化．在不提高供入热的情况下，介绍了强化辐射的三个途径。     

火焰加热炉热辐射模型化研究

由于流体动力学、传热、传质和燃烧动力学复杂的相互作用。构造火焰加热炉数学模型的问题是相当困难。的。但是，传热是炉内发生的最重要的一个传递过程，并且在很大程度上，热辐射占主导地位。因此，必须特别强调辐射模型的选择问题，以便准确地计算炉内的辐射热交换。本文为评估现有的某些辐射模型，使用了三种模型，即段法、流法和改进的蒙特卡罗法，来预示圆筒形炉内的辉焰辐射传热。这三种方法的预示结果表明，双注模型，由于预     

用段法分析高辐射率涂料强化传热的机理

用段法计算了灰体和非灰介质加热炉中的热交换，分析了炉壁热阻和炉壁内表面黑度对炉内辐射换热的影响，阐明在不同的介质中，炉壁特性对炉内辐射传热影响的机理是不同的，第一次得出在非灰介质加热炉中，炉壁温度会随炉壁黑度的增大而降低的结论。     

矿热炉无水冷骨架矮烟罩烟气辐射传热分析

对矿热炉无水冷骨架矮烟罩内烟气黑度、吸收率变化关系以及炉内烟气辐射传热规律进行了研究，并通过计算得到炉内烟气和侧墙温度场。结果表明，烟气中CO2和水蒸气含量对辐射传热有较大影响，辐射强度随高度增加逐渐衰减，烟气温度和侧墙温度也均降低，而烟气黑度和吸收率增加。     

散射性介质辐射传热的数值模拟

利用有限容积法采用C语言模拟了三维圆柱体内吸收、散射性介质的辐射传热温度场：通过辐射传递过程的数值计算，分析了介质本身性质、各向异性散射对温度分布的影响。与光线踪迹法相比较，有限容积法计算速度快具有较好的精度，是目前辐射传递过程数值模拟的一种较好的方法。计算结果表明，由于径向辐射射程比轴向辐射射程小，所以各向异性散射在径向对温度场的影响要比在轴向的大；此外反照率对温度场的影响不大。     

第Ⅳ章 辐射管炉的设计和计算

一、辐射管炉内的热交换在辐射管供热的工业炉内,参与辐射热交换的物体是辐射管、炉衬和被加热的工件。因为工件通常在中性气氛(N_2可达90%)、还原性气氛(H_2可达75%)或渗碳气氛(CO可达12%)等可控气氛内加热,有时就在一般的空气内加热,这类气氛内三原子气体的含量一般都不高,因而炉内气氛对辐射换热并没有重大影响(和电阻炉内的辐射传热颇为相似),计算时可不必考虑气体辐射。由辐射管传给工件的热量按下式计算: Q_(fg)=Ψ_(fg)C_d[((T_f)/(100))~4     

高发射率涂料在加热炉中的节能机理与应用

基于辐射传热原理，本文详细分析了高发射率涂料在加热炉中应用的节能机理，理论分析和实际应用都已经表明在加热炉中应用高辐射率涂料可以增强炉膛内的辐射换热，从而提高炉子的热效率，具有比较好的节能效果。     

辐射管加热的辊底炉内热传递三维数值模拟

基于辐射管加热的辊底炉内角系数的精确求解,建立了炉内三维辐射传热模型,精确求解了炉内各辐射面的温度和热流,全面揭示了炉内辐射传热规律。为该炉型的优化提供了理论依据,为基于辐射管壁温的自动控制方法提供基础。     

热流法计算高温炉内辐射传热

高温炉内的辐射传热是工业生产中常遇到的问题。过去，人们在应用热流法计算辐射传热时遇到了一定的困难，使计算结果与实际有一定的偏差。本文运用文献［１］中给出的新热流数学模型，开发出由新热流方程与能量方程相耦合的计算机程序，其中的比热流参数由线加热热源情况下计算得到。用该程序计算了实验室用马弗炉内的温度场，并且用热电偶实测了炉内的一些温度值，理论计算与实测值符合很好。     

连续退火装置内辐射管性能的研究现状

辐射管的性能是衡量连续退火装置的重要技术指标。目前涉及连续退火装置内辐射管性能的研究主要集中于以下两个方面:辐射管结构对其性能的影响;燃烧器内燃烧条件对其性能的影响。本文详细地阐述了连续退火装置内辐射管性能的研究现状,并提出了未来应重点解决的问题。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.