CITECT驱动程序结构及其重用性的研究

本文通过对CITECT驱动程序的工作方式分析．讨论了CITECT软件与其提供的驱动程序之间交换数据和命令的方式．研究了基于二进制代码的CITECT驱动程序的可重用性。     

导热胶泥伴热传热特性及节能潜力研究

导热胶泥伴热是对传统伴热的一种优化,通过在伴热管与工艺管之间填充导热胶泥,把原来的线接触改变为面接触,一方面增大伴热面积,另一方面用高导热系数的导热胶泥代替低导热系数的空气,从而增大传热效率。利用FLUENT软件对导热胶泥蒸汽伴热系统的传热特性和节能潜力进行了数值模拟分析。结果表明,在伴热蒸汽温度相同时,导热胶泥伴热系统较传统伴热管伴热系统能提高工艺介质温度20~45℃左右,节能潜力较为显著。该研究结果为伴热过程的优化及工程应用提供了理论依据。     

Design and application of a novel coal-fired drum boiler using saline water in heavy oil recovery

In this paper, the design and operation of a novel coal-fired circulating fluidized bed (CFB) drum boiler that can generate superheated steam using saline water were introduced. The natural circulation water dynamics with a drum was adopted instead of the traditional once-through steam generator (OTSG) design, so that superheated steam can be generated for the better performance of the steam assisted gravity drainage (SAGD) technology in heavy oil recovery. The optimized staged evaporation method was proposed to further decrease the salinity of water in the clean water section of the boiler. The evaporating pipes of the salted water section were rearranged in the back pass of the boiler, where the heat load is low, to further improve the heat transfer safety. A CFB combustion technology was used for coal firing to achieve a uniform heat transfer condition with low heat flux. Pollutant control technologies were adopted to reduce pollutant emissions. Based on the field test, the recommended water standard for the coal-fired CFB drum boilers was determined. With the present technology, the treated recovery wastewater can be reused in steam-injection boilers to generate superheated steam. The engineering applications show that the boiler efficiency is higher than 90%, the blowdown rate is limited within 5.5%, and the superheat of steam can reach up to 30 K. Besides, the heavy oil recovery efficiency is significantly improved. Moreover, the pollutant emissions of SO₂, NO_x and dust are controlled within the ranges of 20–90 mg/(N·m³), 30–90 mg/(N·m³) and 2–10 mg/(N·m³) respectively.     

原始组织对60Si2Mn钢亚温淬火组织及力学性能的影响

通过试验分析原始组织对60Si2Mn钢亚温淬火后显微组织和力学性能的影响。结果表明,经过预处理的淬火态试样亚温淬火后的综合力学性能优于热轧态、正火态和调质态试样。     

流化床密相区内固体颗粒对流换热模型研究进展

为深入理解流化床密相区内活性颗粒表面换热过程,论述了乳化相模型、单颗粒和双颗粒模型、变物性模型以及接触热阻模型等流化床密相区内固体颗粒对流换热模型的研究进展,提出了模型发展方向。当流化风速较低时,固体颗粒对流换热系数可采用乳化相模型进行预测。针对流化风速较大的工况,有学者提出了单颗粒和双颗粒模型、变物性模型以及接触热阻模型,并采用适当假设简化模型,然而模型的可靠性仍需进一步验证。最后提出现应加强固体颗粒对流换热过程的模型研究,提高模型在较宽风速范围内对固体颗粒对流换热系数预测的适用性;重点研究活性颗粒在密相区内的运动形式及活性颗粒表面固体颗粒对流换热关键参数测量方法。     

煤的成灰磨耗特性对循环流化床内物料平衡的影响

循环流化床燃烧条件下煤的成灰磨耗特性是影响床内的流化特性和锅炉整体性能的重要因素之一 .利用静态燃烧然后冷态流化实验方法 ,可以得到给煤的成灰及磨耗参数并提出煤种的本征成灰概念 .在此基础上建立稳态的 CFBC冷态灰平衡模型来研究流化床内物料的粒径分布规律 .分析了流化风速、分离器效率和煤灰的磨耗系数对飞灰、排渣和床料的粒径分布的影响 .     

Light charged particle emission for p+Fe reactions

The energy spectra and double differential cross sections of nucleon and the light composite particle (d, t, ³He and α) emissions are studied based on the exciton model included the improved Iwamoto-Harada model. All cross sections of proton induced reactions, angular distributions and energy spectra are consistent calculated and analyzed for ^{54,56,57,58,nat}Fe at incident proton energies below 250 MeV by using nuclear theoretical models which integrate the optical model, the intra-nuclear cascade model, direct, pre-equilibrium and equilibrium reaction theories. Theoretical calculated results are compared with existing experimental data.     

Double differential cross sections of neutron and proton emission in neutron induced reactions on Fe

The energy spectra and double differential cross sections of neutron and proton emissions for n+^54,56,57,58Fe reactions are studied at incident neutron energies below 200 MeV based on the nuclear theoretical models, which are based on pre-equilibrium and equilibrium reaction theories. Theoretical calculated results are compared with existing experimental data.     

高强钢筋与高强混凝土粘结锚固性能试验研究

通过对33个高强钢筋(HRB500)与高强混凝土(最高达C80)粘结锚固试件的拔出试验,分析了高强钢筋与高强混凝土粘结锚固性能和影响粘结锚固强度的主要因素,在对试验结果分析的基础上,对目前《混凝土结构设计规范》(GB50010—2010)的锚固长度规定进行了评价。研究表明:与普通强度钢筋混凝土类似,高强钢筋和高强混凝土的粘结锚固强度随着钢筋直径的减小而增大,随着保护层厚度、横向钢筋配筋率、混凝土抗拉强度的增大而增大;但高强钢筋高强混凝土试件的破坏更加突然,在达到极限拉拔力后试件瞬间劈开,延性较差,配制一定量的箍筋可以较大程度上改善其延性;当混凝土强度等级高于C60时,不同强度等级的混凝土所需要的锚固长度是不一样的;在设计锚固长度时,对于强度等级为C80的高强混凝土,混凝土轴心抗拉强度设计值ft按C80取值,《混凝土结构设计规范》(GB 50010—2010)的计算公式仍适用,是安全的。     

提高柴油加氢加热炉热效率的措施研究

为了提高柴油加氢装置加热炉的热效率,降低其燃料消耗量,采取了针对性的节能降耗措施。具体包括:提高加热炉入口原料温度;检修空气预热器副线调阀,修改PID参数;调节加热炉火嘴燃烧效果,优化操作,降低排烟温度。措施实施后,加热炉热效率由91%提高至92.3%以上,节约燃料气304 m³/h,年可节约资金280.8万元,经济效益明显。