共查询到20条相似文献,搜索用时 265 毫秒
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卧式旋风燃烧液态排渣锅炉技术是使大部分灰在旋风燃烧器内形成液态渣膜并从锅炉底部排出的一种锅炉技术,在解决准东高碱煤强沾污结渣问题方面具有一定的优势。采用冷态实验与数值模拟计算相结合的研究方法,分析了旋风燃烧器内的流场结构特性,并对旋风燃烧器结构参数及运行工况进行了优化。研究结果表明:旋风燃烧器中心处速度较小,在距中心线1/3半径处速度达到最大,旋风燃烧器缩口处存在明显的回流现象;二次风喷口离旋风燃烧器出口较远时有利于流场的稳定,缩口尺寸增大时回流区域变大且旋风燃烧器内风速趋于均匀。 相似文献
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一般水煤浆燃烧器只能燃烧较高挥发分煤种水煤浆.针对低挥发分煤种水煤浆难着火稳燃问题,利用研究开发的新型水煤浆旋风燃烧器,进行了三种不同挥发分煤种水煤浆的燃烧试验,证实了旋风燃烧器可以解决低挥发分水煤浆燃烧问题.该技术对扩大水煤浆的原料煤种和应用范围起关键作用. 相似文献
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燃烧器的发展1956年每只燃烧器的喷燃能力为5.0~7.0百万大卡/时(约500~700公斤/时重油)的油燃烧器(图1)。在当时条件下这一发展已经被认为是大胆的。燃烧空气的送入主要是利用旋风室,轴向和径向的旋流叶片。首先是从船舶锅炉燃烧构造上提到扩大燃烧器单元容量的问题,并积累了足够的运行经验。 相似文献
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设计了玛钢退火隧道窑,采用了可调式旋风煤粉燃烧器,并用变频调速器来控制煤粉机及风机转速以控制燃料的输出量,节约了能源,提高了产品质量和热效率。 相似文献
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鹿寨糖厂SH20-25/400型锅炉改造,把其狭缝式直流燃烧器改为PW-Ⅰ型旋风束全风混多煤种煤粉燃烧器,同时,改制粉系统热风干燥为热风+高浊炉烟干燥。锅炉负荷大幅度提高,飞灰,大渣可燃物含量降低,锅炉热效率明显提高,取得了良好的经济效益和社会效益。 相似文献
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介绍了58MW循环流化床热水锅炉的技术条件、组成部分及布置、主要部件(燃烧室及水冷壁、省煤器、空气预热器、分离器及回料系统)的结构特性及市场发展前景。 相似文献
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Experimental Studieson Gas-Particle Flows and Coal Combustion in New Generation Spouting-Cyclone Combustor 总被引:1,自引:0,他引:1
ExperimentalStudiesonGas-ParticleFlowsandCoalCombustioninNewGenerationSpouting-CycloneCombustorD.X.Wang;Z.H.Ma;X.L.Wang;L.X.Z... 相似文献
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A combustion set-up of an innovative nonalagging cyclone combustor called “Spouting-Cyclone Combustor(SCC)”,,with two-stage combustion,organized in orthogonal vortex flows,was established and the experimental studies on the fast ignition and stable combustion of coarse coal particles in this combustor were carried out.The flame temperature versus ignition time and the practical fast ignition the temperature fields in SCC were obtained.These results whow that it is possible to obtain highly efficient and clean combustion of unground coal particles by using this technology. 相似文献
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Demands for the thermal treatment of sewage sludge are increasing due to the regulation of its ocean disposal and the desire to recover its potential energy. Because of the high nitrogen content in sewage sludge, one of the concerns about its combustion is a potential increase in NOx emissions. Although a number of studies have been conducted to reduce NOx emissions by combustion modifications, very few studies have addressed the combustion of dried sludge. In this study, a combustion technique called moderate or intense low oxygen dilution (MILD) was applied to the combustion of dried sludge with the goal of reducing NOx emissions. MILD combustion of dried sludge was tested using both our laboratory-scale vertical combustor with internal circulation and our horizontal cyclone combustor with external circulation. Tests were conducted to find suitable operating conditions and to demonstrate the stable MILD combustion of dried sludge. From these tests, fuel and air flow patterns were found to be an important factor in maintaining stable MILD combustion, and the horizontal cyclone combustor demonstrated excellent performance in the reduction of NOx emissions by the MILD combustion of dried sludge. 相似文献
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Experimental studies on Gas—Particle Flows and Coal Combustion in New Generation Spouting—Cyclone COmbustor 总被引:1,自引:0,他引:1
Based on previous studies, an improved non-slagging spouting-cyclone combustor with two-stage combustion, organized in perpendicularly
vortexing flows, is developed for clean coal combustion applied in small-size industrial furnaces and domestic furnaces. The
isothermal model test and the combustion test give some encouraging results. In this study, further improvement of the geometrical
configuration was made, a visualization method and a LDA system were used to study the gas-particle flow behavior, and the
temperature and gas composition in combustion experiments were measured by using thermocouples and a COSA-6000-CD Portable
Stack Analyzer. Stronger recirculation in the spouting zone and the strongly swirling effect in the cyclone zone were obtained
in the improved combustor. The combustion temperature distribution is uniform. These results indicate that the improved geometrical
configuration of the combustor is favorable to the stabilization of coal flame and the intensification of coal combustion,
and it provides a basis for the practical application of this technique. 相似文献
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研究开发了一种新的脉冲装置。这种脉冲装置继承了里克管脉冲燃烧的无阀自激和燃料适应性广的优点,又避免了里克管长径比过长的缺点,成功地将长径比缩短到5以下,被称为Rijke—ZT型脉冲装置。试验表明:该装置无需任何附加装置,而能产生强烈的声振,极大地强化燃烧和传热,是一种清洁高效的燃烧装置。此外,还总结了Rijke—ZT层燃自吸风脉冲锅炉的设计经验,列举了工程化中还存在的技术问题。图4表2参5 相似文献
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气体温度的脉动直接影响到湍流中的化学反应,基于气体焓脉动均方值输运方程,给出了一种计算气体温度脉动均方值的方法.采用此方法对旋流燃烧室内湍流扩散燃烧的温度脉动特性进行了数值模拟,并将模拟结果与实验测量数据进行了对比. 相似文献
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旋风筒内强旋湍流流动的实验研究 总被引:3,自引:0,他引:3
本文采用能同时测定流场方法和速度的旋转式一孔探针,对不同结构的旋风筒内强度旋湍流流动进行了实验研究,给出了不同的入口位置和出口结构对流场中轴向切向速度分布和回流位置等特性的影响规律,研究结果对旋风炉及旋风除尘器的设计有着重要的参考价值。 相似文献
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参照西门子的第四代干式低污染(Dry Low Emissions,DLE)燃烧室,设计了模型燃烧室,通过激光粒子图像速度仪(Particle Image Velocimetry,PIV)测量技术,对燃烧室头部出口流场进行了实验研究,分析了头部结构变化和入口空气流量变化对流场特性的影响。研究结果表明:两个主旋流器的旋流方向组合对燃烧室头部出口的流场特性有着很大影响;预混室RPL (Rich-Pilot-Lean)段的流量变化主要影响旋流器中轴线附近的轴向回流速度;入口空气流量变化对流场的影响主要表现在速度值上,但对速度变化趋势没有太大的影响。 相似文献