分层燃烧技术机理分析与应用

分层燃烧技术是一种提高锅炉效率的有效措施，近来在山东得到了广泛的推广。本文从理论上分析了分层燃烧技术可提高锅炉效率和锅炉出力的基本原因。分层燃烧技术对改善反平衡测试中q4较大、尤其是炉渣含碳量较高而引起的锅炉效率较低和出力不足的情况更为有效。同时也指出，锅炉的改造需进行反平衡测试和专家论证，以找出锅炉效率低的根本原因，因而采取不同的措施，避免锅炉改造的盲目性。     

锅炉分层燃烧节能技术的应用

本文阐述了锅炉分层燃烧技术的节能原理 ,详细介绍其运行使用情况 ,通过经济效益分析 ,认定分层燃烧技术是锅炉节能的重要措施。     

锅炉分层燃烧节能技术的应用

本文阐述了锅炉分层燃烧技术的节能原理，详细介绍其运行使用情况，通过经济效益分析，认定分层燃烧技术是锅炉节能的重要措施。     

锅炉分层燃烧技术的应用和节能效益

利用分层燃烧技术对链条锅炉给煤装置进行发行,使煤在炉排上分层燃烧,是使煤燃烧完全,降低出渣含碳量,提高锅炉热效率,降低能源消耗的有效途径。     

链条锅炉分层给煤装置的节能原理及应用

本文根据链条锅炉的燃烧原理，结合分层给煤装置的性能，论述了分层燃烧技术在锅炉应用中所取得的节能效果和综合效益。     

分层给煤装置改造运行情况和经济效益分析

分层給煤装置作为热水锅炉燃烧调节的重要部件,直接影响锅炉的燃烧效率。通过对变层分段多煤形给煤装置应用实例的经济效益分析,说明分层燃烧技术对锅炉供暖节能降耗具有积极作用。     

混煤器技术与三辊式分层分行分段给煤装置的研发与应用

在单、双辊式分层燃烧技术的研发与应用基础上,提出均匀煤仓内燃煤技术,即混煤器技术,并将其应用到三辊式分层分行分段给煤装置的研发之中.该装置兼具混煤器与分层给煤装置的特点,其结构简单实用,运行安全可靠,解决了煤层风阻不均等问题,可有效提高锅炉燃烧效率,保证锅炉燃烧安全稳定.     

济三煤矿锅炉房节能技术的应用

介绍了济三煤矿锅炉房采取的一整套节能技术,并对各项技术的实施进行了经济分析,其中锅炉分层燃烧的实施及特殊分层燃烧结构效果较好。     

链条锅炉分层燃烧智能装置

沈阳达源节能环保科技有限公司是从事锅炉燃烧技术研究和技术改造工作的科技企业,该公司研制开发的FCZ—AI链条锅炉分层燃烧智能装置,是根据链条锅炉分层燃烧工艺条件设计的燃烧控制检测装置,该设备可实现单台锅炉炉前耗煤量的检测。使锅炉在满足正常负荷运行条件下,最大限度地节约用煤,降低煤炭消耗,有利于单台锅炉煤耗的控制,促进企业内部的班组能耗考核和科学管理,达到企业提高经济效益和最佳的节能降耗目标。     

锅炉分层给煤装置在链条炉上的应用

机械式层燃链条炉,由于它实现了加煤和除渣的机械化,因此,在一些小型锅炉上得到广泛的应用.自从分层式给煤装置发明以来,该技术以其构思新颖、结构合理、性能稳定可靠等优点,迅速在链条炉上被推广应用.我厂于1994年5月引进的由平度环保机械厂生产的锅炉分层给煤装置,用于UG-35/3.82-M18型锅炉上,取代了原来的闸板式给煤机构;继而又对另两台WGC-20/3.82型锅炉进行了分层燃烧改造,直至1996年新安装一台35t/h炉也采用了分层燃烧技术.经几年的运行看,收到了良好的节能效益.2 分层式锅炉给煤装置的原理(1)正转链条炉之所以燃烧不好,其根本的原因是由于燃煤与设计煤种不符,尤其是给煤粒度0-3mm的煤屑含量高达50%以上,严重超出了层燃锅炉对原煤粒度的要求.     

直喷式增压柴油机燃烧过程可视化研究

介绍采用高速摄影技术研究直喷式增压柴油机的燃烧过程，研究工作在单缺柴油机上进行。研究结果表明，进气增压改善了上柴油机燃烧过程；促进了燃油和空气的混合，增加了燃油束向燃烧室中心的扩展区域，壁面附近燃油堆积量减小；缩短了着火延迟期，增加了扩散燃烧的比例，火焰扩展速度降低；改善了燃烧室内的燃烧条件，抑制了燃烧火焰向活塞顶部外溢。     

The efficiency of heat transfer through the ash deposits on the heat exchange surfaces by burning coal and coal-water fuels

The results of the numerical simulation of heat transfer from the combustion products of coal and coal-water fuels (CWF) to the internal environment. The mathematical simulation has been carried out on the sample of the pipe surfaces of the combustion chamber of the boiler unit. The change in the characteristics of heat transfer (change of thermochemical characteristics) in the conditions of formation of the ash deposits have been taken into account. According to the results of the numerical simulation, the comparative analysis of the efficiency of heat transfer has been carried out from the furnace environment to the inside pipe coolant (water, air, or water vapor) from the combustion of coal and coal-water fuels. It has been established that, in the initial period of the boiler unit operation during coal fuel combustion the efficiency of heat transfer from the combustion products of the internal environment is higher than when using CWF. The efficiency of heat transfer in CWF combustion conditions is more at large times (t ≥ 1.5 h) of the boiler unit. According to the results the numerical simulation of the temperature distributions in the system “pipeline environment — pipe wall — a layer of ash — the products of combustion” have been obtained. A significant decrease in heat flux from the combustion products to the inside pipe coolant in the case of coal combustion compared to CWF has been found. It has been proved that this is due primarily to the fact that massive and strong ash deposits are formed during coal combustion.     

一种高效率的内燃机燃烧模式

本文探讨了以双燃料发动机为代表的预混合和扩散燃烧共存的复合燃烧模式。认为这种燃烧模式兼有预混合燃烧和扩散燃烧的优点，而且有比传统的燃烧模式更高的热效率。实验证明，采用这种燃烧模式工作的发动机可以有比火花点火式发动机更高的压缩比，有比压燃式发动机更高的燃烧速率。最后对这种发动机的燃烧特性及获得较高热效率的原因进行了分析。     

高温空气燃烧技术(1)

高温空气燃烧技术(蓄热燃烧技术)是20世纪80年代国际燃烧领域开发并得到大力推广应用的一项新型的燃烧技术。从实验研究、数值模拟和工业应用等方面对该技术的国内外研究现状进行了全面系统的综述。在此基础上对应用该技术的典型案例进行了系统地分析研究。所做工作对该技术在我国的推广应用有重要的参考价值。     

压燃式双燃料发动机燃烧模型的新进展

本文提出了用含有１１９个化学反应式，４１种化学组分的燃烧模型，实现了对甲烷（ＣＨ４）－柴油双燃料发动机燃烧过程的描述。与现有模型相比，本模型创建了化学反应机理子模型及相应的气相反主尖的理论体系，克服了凭经验组合反应机理的缺点；用多区燃烧模型代替了对引燃油瞬时燃尽假设的引燃油燃烧模型，在传热学模型中考虑了辐射因素，并局用热力学性质代替整体热力学性质进行传热计算。     

内燃机燃烧研究及面临的挑战

本文从若干侧面分析了内燃机燃烧研究的国内外现状和发展趋势,给出了内燃机燃烧研究面临的若干问题。内燃机燃烧是一个涉及多学科的复杂的化学反应和能量转换过程,内燃机燃烧过程还有很多方面没有被人们完全把握,特别是缸内复杂燃烧过程中化学反应机理和碳粒的生成。燃烧测试技术的发展对燃烧过程的深入认识将发挥越来越重要的作用。排放法规的不断严格和燃油耗指标的不断提升将推动内燃机燃烧的研究工作,一些新概念燃烧方式也推动了内燃机燃烧研究工作的新进展。代用燃料发动机仍将成为内燃机研究的一个重要方向,燃烧优化控制结合先进的后处理技术是内燃机实现高效低污染的重要途径。     

火花点火发动机准维湍流卷吸燃烧模型的适用性研究（二）

本文利用作者提出的火花点火发动机准维湍流卷吸燃烧模型，对压缩比为１０和１２的火球形燃烧室以及压缩比为１０的碗形燃烧室变工况进行了计算，将计算得到的示功图、质量燃烧率等与实验值进行了对比对分析。结果表明，合理选取与燃烧室结构相对应的四个经验常数，准维湍流卷吸燃烧模型完全适用于火花点火发动机变工况及不同燃烧室结构工作过程的计算，能够正确反映火花点火发动机结构参数和运转参数对燃烧过程的影响。     

Energy efficiency trade‐off with phasing of HCCI combustion

Homogeneous charge compression ignition (HCCI) combustion in diesel engines offers the potential of simultaneous low NOx and soot emissions. However, this is normally accompanied by high hydrocarbon (HC) levels in the exhaust and an early combustion phasing before the top‐dead‐center (TDC) that may drain out substantial amounts of fuel energy from the engine cycle. Exhaust gas recirculation is usually applied to delay the onset of combustion, thereby shifting the phasing of the heat release close to the TDC. Although the retarded phasing improves the engine energy efficiency, a significant increase in HC and carbon monoxide emissions will deteriorate the combustion efficiency. Therefore, an inherent trade‐off exists between the combustion phasing and the combustion efficiency that needs to be minimized for improved energy efficiency. In this work, both theoretical and experimental studies have been carried out to evaluate the combustion efficiency‐phasing (CEP) trade‐off. Engine tests have been conducted to analyze the losses in combustion (burning) and phasing efficiencies, and along with theoretical analyses, the CEP trade‐off has been evaluated in terms of a ‘coefficient of combustion inefficiency’ (CCI). The CCI quantitatively correlates the losses in combustion and phasing efficiencies and provides a reference for improving the combustion phasing of the HCCI operation vis‐à‐vis the combustibles in the exhaust. The focus of this research is to carry out a quantitative analysis of the energy efficiency of HCCI cycles. Copyright © 2011 John Wiley & Sons, Ltd.     

Recent progress in electric-field assisted combustion: a brief review

The control of combustion is a hot and classical topic. Among the combustion technologies, electric-field assisted combustion is an advanced techno-logy that enjoys major advantages such as fast response and low power consumption compared with thermal power. However, its fundamental principle and impacts on the flames are complicated due to the coupling between physics, chemistry, and electromagnetics. In the last two decades, tremendous efforts have been made to understand electric-field assisted combustion. New observations have been reported based on different combustion systems and improved diagnostics. The main impacts, including flame stabilization, emission reduction, and flame propagation, have been revealed by both simulative and experimental studies. These findings significantly facilitate the application of electric-field assisted combustion. This brief review is intended to provide a comprehensive overview of the recent progress of this combustion technology and further point out research opportunities worth investigation.     

A theoretical study of quasisteady sphericosymmetric combustion of alcohol droplets

A distinct characteristic of alcohol droplet combustion is absorption of moisture, generated as combustion product, during early part of the droplet life. A theoretical model for combustion of alcohol droplets has been developed. The quasisteady sphericosymmetric gas phase equations have been solved analytically while the transient diffusive liquid phase equations have been solved numerically. It is observed that neglecting the effect of moisture absorption in combustion modelling leads to underprediction of droplet life and overprediction of flame temperature and flame stand-off ratio. The results show that for alcohols with boiling points lower than that of water, a significant amount of moisture, generated during combustion is absorbed by the droplet. Absorption of this moisture prolongs droplet life and reduces flame temperature. A similar effect is also observed with increasing initial moisture content in the droplet.