反应精馏过程中的多稳态分析

Reactive distillation processes for synthesis of ethylene glycol （EG） and ethyl tert-butyl ether （ETBE） were modeled with the simulation package ASPEN PLUS. The input multiplicity and output multiplicity were discussed with the method of sensitivity analysis for both cases. In EG production process, steady state multiplicities were studied in terms of effective liquid holdup volume and boil-up ratio. In ETBE synthesis process, the user kinetic subroutine was supplied into ASPEN PLUS firstly, and then the composition, temperature and reaction-rate profiles within the reactive distillation column were presented in detail. A set of stable solution branches based on distinct initial guesses for a range of boil-up ratio were found in EG synthesis. Input multiplicities were observed for a range of reboiler duty at several values of reflux ratio for ETBE synthesis process. These results can be used to avoid excessive energy consumption and achieve optimum design of reactive distillation column.     

一种离心力修正的湍流模型及其在数值模拟中的应用

通过分析强旋流场中离心力的作用，提出了考虑湍流脉动中离心力作功的湍流模型(k-ε-cf模型)。模型的特征参数根据大涡参数和小涡参数的几何平均得到，其中旋涡的频率与热线测量实验结果一致。运用k-ε-cf模型对一同轴旋转分层流燃烧器空气动力场进行了数值模拟，计算结果与实验数据吻合良好，比标准k-ε模型结果有较大改进。图4参4     

内循环废弃物焚烧炉研究进展及关键问题探讨

阐述了内循环废弃物焚烧技术的优点及发展现状，介绍了几种典型的内循环废弃物焚烧炉，对内循环废弃物焚烧炉的关键问题进行了探讨。     

短切玄武岩纤维增强混凝土力学性能试验研究

考察了玄武岩纤维混凝土(basalt fiber reinforced concrete,BFRC)各项力学性能。对BFRC抗压强度值进行数理统计,分析表明:玄武岩纤维长度对BFRC抗压强度无显著影响,体积掺量对BFRC抗压强度有显著影响,两者对BFRC抗压强度值有显著的交互作用。长度18 mm的玄武岩纤维,体积掺量为0.1%时,对BFRC的抗折强度、初裂能耗和破坏能耗增强果最显著。玄武岩纤维能减缓BFRC的早期开裂。     

300MW燃煤锅炉炉内NOx生成与控制的试验研究

控制电力生产过程中NOx生成量的方法主要是分级燃烧.选择国内具有代表性的300 MW燃煤电站锅炉为对象,对锅炉不进行改造,在不同负荷条件下,利用分级燃烧原理,通过炉内优化分级燃烧试验,得出了降低炉内NOx生成的控制参数.额定负荷时,炉内NOx排放浓度在原有基础上降低了22.45%,有效地控制了NOx的排放.