液态排渣煤气化炉炉内灰渣的流动和换热研究

建立了液态排渣煤气化炉炉内灰渣的流动和换热的数学模型,模型以基本的流动和换热方程为基础,经过简化物理模型,得到求解渣膜厚度的方程和渣膜的换热方程。为求解方程,在前人研究成果的基础上,结合对国内煤种的试验,总结出煤灰渣粘度与相关气化温度关系的方程。利用建立的模型,采用差分法对两段式干煤粉加压气化炉进行求解,得到灰渣的流动速度和渣膜厚度,并与该炉运行试验数据进行比较,发现理论求解结果和试验结果相近,证明了该模型的正确性。文中同时分析了该模型的局限性,该模型是忽略了炉内煤气对灰渣流动和换热影响的孤立模型,将该模型与炉内煤气流动和换热模型联合可以得到更精确的炉内灰渣的流动和换热的解。     

全燃和掺燃高炉煤气炉的比较研究

由于高炉煤气中含有大量的惰性气体 ,可燃成分少 ,发热值低 ,燃料产物的体积流量大 ,因而使大容量高压燃煤气锅炉各受热面的传热特性与燃煤锅炉相比发生很大的变化。针对 5 0MW高压锅炉全燃和掺燃高炉煤气2种炉型的特点进行了详细的分析讨论 ,并与燃煤锅炉进行了比较研究 ,阐述了燃用高炉煤气锅炉的热工参数、传热特性以及受热面布置的特点 ,为研究和设计燃用高炉煤气炉提供了可靠的实践数据和理论依据。     

Applying ACF to Desulfurization Process from Flue Gas

Inasmuch as the status of environmental pollution caused by SO2 is more and more serious and the policy of environmental protection is executed more and more strictly, desulfurization from flue gas (FGD) is introduced to a wide-spread field of national economy. By a comparison with lime-limestone method, the application of adsorption method in FGD is more effective in desulfurization and more adapted to the situation of our country in respect of its more valuable byproduct. However, the technique of adsorption method is limited by the large amount of adsorbent used. In this paper, activated carbon fiber (ACF) is proposed as a new type of adsorbent to apply in FGD. A series of experiments have been made in order to compare the performances between ACF and granular activated carbon (GAC) which has been mostly used.Experiments show that under the same working conditions ACF‘s adsorption capacity is 16.6 times as high as that of GAC, mass loss rate is 1/12 of GAC‘s, desorption efficiency of ACF can reach99.9%. The theory of micropore adsorption dynamics is adopted to analyze the characteristics of both adsorbents. It is indicated that adsorbability and perfectibility of desorption are tightly related to the distribution of pores and the surface micromechanism of adsorbent surface. The accessibility of pores for specified adsorptive and the effects of capillary condensation are crucial factors to influence the process of FGD. According to the research of different adsorbents, conclusion can be drawn that ACF is a kind of good material with a strong selectivity for SO2. Compared with the traditional methods of FGD, the use of ACF can greatly economize the consumption of adsorbent and obviously reduce the introduction of new adsorbent, and at the same time keep down the equipment investment and operating cost.     

50MW高压锅炉全燃高炉煤气的研究

对50MW高压锅炉全燃高炉煤气时的特性进行了详细讨论。阐述了高炉煤气锅炉稳定着火燃烧的燃烧技术和结构特点,分析了燃用高炉煤气对锅炉热工参数、传热特性以及受热面布置的影响,提出了适用高炉煤气的锅炉布置型式。根据研究结果制造的我国首台50MW高炉煤气的锅炉布置型式。根据研究结果制造的我国首台50MW高炉煤气高压锅炉成功运行的实践证明,该可以有效解决高炉煤气放散污染问题,在冶金工业中有着广阔的应用前景。     

适用于无烟煤燃烧的新型涡流拱特性的研究

提出一种能够用于链条炉燃用无烟煤的涡流拱新技术。通过模化试验对涡流拱特性进行了试验研究,分析了其工作机理,获得确定涡流拱最佳结构尺寸的要素。结果表明,涡流拱能有效地增加后拱气流向前拱的卷吸输送量,有助于提高前洪温度。在首次应用实践中,对于燃用Ⅲ类末煤型无烟煤的炉膛能够及时着火、强化燃烧,取得了满意效果。     

高压高炉煤气炉受热面的传热特性

由于高炉煤气中含有大量的惰性气体，可燃成分少，发热值低，燃烧产物的体积流量大，因而使大容量高压燃煤气锅炉各受热面的传热行性产生很大的变化。     

某余热锅炉爆管原因分析和改造

水循环回路的合理布置和设计对余热锅炉的安全运行具有重要意义。循环回路结构复杂容易导致并联管内的流量分配较大的不均匀性。偏差管内的流量较小 ,循环倍率较小 ,容易发生水循环停滞。当余热锅炉的热负荷很低时 ,循环流速较小 ,自然循环发生停滞 ,容易导致余热锅炉发生爆管。水循环的脉动会使并联管内循环流速和管壁温度发生脉动 ,余热锅炉的安全性下降。消除并联管内的流量分配不均匀和水循环脉动 ,合理运行 ,能够提高自然循环的可靠性 ,对余热锅炉的安全运行是有利的     

冲击热负荷作用下垂直自然循环水动力特性的试验研究

为研究炼钢转炉余热锅炉，设计了一套简单、可靠的试验系统，对其在冲击热负荷下垂直自然循环的水动力特性进行了研究，并分析了冲击热负荷和工质欠焓对水动力特性的影响，得到水动力特性的一般变化规律。对改善炼钢转炉余热锅炉的水循环状况提出了一些建议。