脉冲燃烧系统及应用

论述了脉冲燃烧系统的结构和系统的工作原理.通过对工作原理和系统结构的分析,阐述了脉冲燃烧系统的优点以及存在的问题.提出了该系统在我国应用存在的问题和局限.     

浅谈梭式窑的燃烧系统

本文简要叙述了现代化梭式窑的三种燃烧系统及其各自的应用特性，并指出脉冲／比例调节高速燃烧系统可取长补短获得最佳效果，是一种较好的燃烧方式。     

热处理炉燃烧控制研究与应用

介绍热处理炉计算机控制系统的结构和功能,重点分析了数字脉冲燃烧控制、压力控制、温度控制和安全联锁控制等各种控制原理和方法,阐述了热值仪在燃烧控制中的重要作用。     

线性-脉冲复合燃烧技术及其应用

分析了连续线性燃烧与脉冲燃烧方式的各自特点，介绍了线性-脉冲复合燃烧技术及其控制系统，并以高精度控温的特种陶瓷窑炉为实例阐述了该项新技术的推广应用。     

新型脉冲燃烧系统控制方案

本文介绍了一种新型的脉冲燃烧系统控制方案。该方案较好地弥补了传统脉冲燃烧系统控制方法的不足，成功地解决了窑炉内热振荡问题。     

新型脉冲燃烧系统控制方案的研究

本文介绍了一种新型的脉冲燃烧系统控制方案.该方案较好地弥补了传统脉冲燃烧系统控制方法的不足,成功地解决了窑炉内热振荡问题.     

脉冲控制燃烧对陶瓷烧成窑内温度均匀性及燃耗的影响

对陶瓷烧成窑进行了脉冲控制和连续比例调节控制燃烧的对比实验，测量、记录了窑内温度均匀性和燃耗等实验数据，并初步分析了脉冲燃烧的节能原理。     

配风方式对部分预混燃烧系统燃烧振荡的影响

部分预混燃烧系统是燃气热水器的常用燃烧系统,研究这种燃烧系统中配风方式和燃烧工况的关系十分重要。通过搭建实验台,研究了一个具有三次风的部分预混燃烧系统在不同过量空气系数下的燃烧振荡区域。发现该系统存在一个介于两正常工作区域之间的燃烧振荡区域,该区域的界限随着配风方式的变化发生偏移,减小一次风量时其正常工作范围扩大。通过分析,认为其燃烧振荡范围与一次过量空气系数值有直接关系,该范围具有一个上限,对应一次过量空气系数为0.80～0.95;具有一个下限,一次过量空气系数为0.40～0.50,此范围内发生燃烧振荡的概率较大。     

快速循环床燃用不同煤种的试验

<正> 一、前言江西丰城煤是国家“七五”重点科技攻关项目35t/h循环流化床发电锅炉的研制中规定采用的煤种。为使锅炉顺利投运,我所在0.2MW燃烧装置上继大同煤之后,对丰城煤又进行了试验。另外对不同粒级的张家口地区的烟煤也进行了燃烧试验,从中观察快速循环流化床的燃烧对煤种的适应性。二、实验流程及设备实验流程如图1所示,主要分为加料(Ⅰ)、燃烧(Ⅱ)及除尘(Ⅲ)三大部分。 1.加料系统。采用了自制的气动圆筒式加料器,通过脉冲频率和脉冲气量的调节,使物料稳定连续地加入炉中,克服了传统的机械传动给料中磨损和漏气等缺陷,尤其适用于高压燃烧装置。     

适用于催化剂和发光材料研究的并行合成和高通量表征技术

介绍了作者课题组近年来所发展的适用于催化材料和发光材料研究的并行合成和高通量表征技术,以及在新材料筛选方面开展的工作。在并行合成方面包括组合喷射合成仪、微型阵列式溶液燃烧技术以及结合四元掩模和连续掩模的磁控溅射和脉冲激光沉积系统;高通量表征部分包括真空紫外荧光照相系统和组合光谱扫描仪、红外热成像筛选装置和同步辐射红外光谱成像系统。最后,简要介绍了利用所发展的组合技术在稀土聚合物敏化发光材料、真空紫外荧光材料以及可见光响应光催化材料方面开展的工作。     

燃煤隧道窑

介绍了燃煤隧道窑的结构、配套系统、烘窑、热工制度、产量与燃料等。该窑系统齐全，窑内火焰、气流组织合理；窑车曲折密封、窑底均压起到了良好效果；阶梯炉栅式火箱和周期烧火操作，可使赛温稳定在１３７０—１４００℃。该窑烧出了优质粘土制品。     

Rapid firing of silica

Summary It was shown to be possible to fire silica in 200-ton periodic kilns in 160–170 h without worsening their properites.Experiments on the rapid heating and cooling of silica need to be continued both in test and in industrial furnaces.In an experimental furnace the firing time was reduced by about 80%, but this schedule was not proven in an industrial kiln.The obtained thermal-physical properties of the green goods permit a more accurate calculation of the permitted rated of heating. It is necessary to explain the influence of grading, batch composition and pressing conditions on the thermal-physical properties of green silica goods.     

On the effects of firing semi-anthracite and bituminous coal under oxy-fuel firing conditions

Traditional wisdom has lead to the design of a boiler being dictated by its fuel. Typically, lignite requires a large boiler to accommodate the moisture content and ash behaviour and anthracite needs a design with a long residence time to allow for complete combustion. Thus the result is that different boiler designs are required for different fuel types. This work demonstrates that it is possible to fire under oxy-fuel firing conditions different fuels in potentially a single combustion environment. In the present work a short series of scoping tests firing Russian semi-anthracite under air and oxy-fuel firing conditions on the RWEnpower Combustion Test Facility (CTF) have been performed and result compared to firing a South African bituminous coal. An IFRF swirl burner was used. The purpose behind this work was to determine whether oxy-fuel firing offered the potential for firing a wider range of coal qualities on a swirl stabilised burner than is conventional showing that stable combustion can be achieved with semi-anthracite as with bituminous coal. In this short communication, it is shown that this is possible. Flame photographs of the Russian semi-anthracite coal fired on air and under oxy-fuel firing conditions at recycle ratios of 75%, 72% and 68% were taken. The air firing condition produced a non-luminous flame in the near burner region. For oxy-fuel firing at 75% recycle ratio, the flame is also non-luminous and more so that the air firing case. When the recycle ratio is reduced from 75% to 68% the flame becomes increasingly luminous and at 68% an intense flame was observed well anchored into the burner quarl. Radiative heat flux measurements were taken with the Russian semi-anthracite coal at 68% recycle ratio and compared to the South African bituminous coal at 68% recycle ratio and on air. In general the peak in radiative heat flux for the Russian semi-anthracite at 68% recycle ratio compared to the South African bituminous coal on air is slightly higher reflecting the effect of oxygen enrichment and the higher calorific value of the semi-anthracite. It can also be observed that the location of the peak in radiative heat flux with Russian semi-anthracite coal at 68% recycle is displaced downstream. In the near burner region, the radiation intensity is lower for the Russian semi-anthracite at 68% recycle ratio compare to South African bituminous coal at 68% recycle ratio and on air reflecting the lower (but not insignificant) intensity of combustion in this region for the Russian semi-anthracite coal.     

Creation of microcracks in porcelain during firing

Quartz porcelain samples were tested by acoustic emission (AE) and sonic resonant methods (sensitive to nucleation and motion of structural defects) during a cooling stage of the firing process from temperature of 1250 °C. As a consequence of the mismatch of thermal expansion coefficients of the glass and the mullite phases, and the quartz particles, microcracking begun at the temperature of the glass transition (∼800 °C) and continued in several stages until the temperature reached 300 °C. A non-monotonous behaviour of the Young's modulus and temporary vanishing of the AE signals on cooling between 573 and 500 °C confirm the significance of the β → α transition, which lies mainly upon the reversal of thermal stresses acting on the glass matrix and the quartz particles. Consequently, above this temperature, radial cracks nucleating at the quartz particles appear, whereas below this temperature, circumferential cracks around the particles are produced.