【作者】 苏红星；

【导师】 靳世平；

【作者基本信息】 华中科技大学 ， 工程热物理， 2005， 硕士

【摘要】 针对加热炉节能这样一个课题,本文从理论分析、技术研究、工业应用等方面进行了探讨,主要内容如下: 首先从理论上分析了排烟温度、过剩空气系数、加热炉负压等一些参量对加热炉效率的影响。得出加热炉节能应该着重考虑在保证加热炉安全的前提下尽量降低排烟温度、降低燃烧所需的过剩空气系数以减少烟气量,最终达到减小排烟损失的目的。在理论分析的基础上再从具体实施的角度探讨加热炉节能可以采取的一些措施(如增加对流管排、增设空预器、涂辐射涂料等)。然后分析了这些方法的优缺点,提出了旋流场燃烧节能新技术。旋流场燃烧节能新技术从燃烧和传热的角度考虑,较之别的改造办法有效果更明显、改动小等一系列的优点。研究内容由热力计算、模型试验等部分组成。热力计算对该改造对加热炉安全方面可能带来的影响做了一个定量的分析,并对改造的效果进行预估。通过模型的冷态试验,对旋流场燃烧加热炉内流场较直流时的均匀性和较小的阻力增加量有了较好地了解。热态试验则得到了更加均匀的温度场分布和更好的传热效果,同时管壁温度在安全允许的范围内有所增加。试验结果显示出旋流场燃烧改造有助于燃烧状况的改善和炉内传热的增强。最后将研究的成果应用于工程实践。旋流场燃烧改造后的运行效果表明本文研究结论正确的。改造后排烟温度比改造前降低了40℃,炉膛火焰充满度大为改善,燃料量节约了近7%。带来了良好的经济效益。更多还原

【Abstract】 Serious lack of energy makes enterprise search for ways to save energy and reduce loss. this is how Baosteel Chemical F1101 furnace retrofit come。Exhaust gas loss、heat dissipating loss and carbon loss are the main factor of what take furnace energy loss. Since the potential of decrease heat dissipating loss and carbon loss is limited, and exhaust-gas loss is the most part of the all, what’s more, exhaust gas loss can be decreased together with carbon loss. Therefore, to decrease the exhaust gas temperature is the key point of saving the furnace energy。This article firstly abstractly analyze the relationship of furnace efficiency and some parameters(surplus air 、hearth pressure). Then abstractly discuss the measure(add convection coils、air preheated, spread radiation coating, etc) can be take to save the furnace energy cost. Finally the advantage and disadvantage are analyzed. And a better way for this retrofit-swirl field combustion technology is put up. This retrofit include thermal calculation、cold and hot-state experiment、on-spot construction. thermal calculation can quantify the influence of retrofit to he furnace parameters, evaluate the safety(this is very important for the retrofit of chemical furnace with complex configuration、high safety demand). And thermal calculation can also decide the retrofit parameters、forecast retrofit effect。By cold-state field experiment, It can be find that swirl field is more uniformity than the direct, swirl field axial velocity is smaller than the other, tangential velocity is bigger the direct. In hot-state experiment, uniformity temperature field、better heat-transfer effect and the addition within safety permission of the coils wall temperature is got. the experiment conclusion make it sensible that the retrofit help to improve the combustion situation、strengthen the heat-transfer. The on-spot retrofit effect proved the deduction taken in the former study is right. after retrofit, the waste-gas temperature decrease by 40℃,hearth fullness is improved greatly, and the fuel is saved by 7 percent, result in very good economic performance。更多还原