This study investigates the environmental significance of ciprofloxacin as an emerging contaminant and the need for effective degradation methods. The chemical coprecipitation method was used in this study to prepare the Zn-Cu-Ni composite silicate, serving as a heterogeneous ozonation catalyst. The catalytic activity was then evaluated by degrading ciprofloxacin (CIP). Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption–desorption, and Fourier transform infrared analysis (FTIR) were used to characterize the Zn-Cu-Ni composite silicate. The catalyst had a high surface area (308.137 m2/g), no regular morphology, and a particle size of 7.6 µm and contained Si-O-Si, Ni-O-Si, and Zn-O-Si. The results showed that the CIP degradation and mineralization rates (pH 7.0, CIP 3.0 mg/L, Ozone 1.5 mg/L) were significantly enhanced in the presence of the Zn-Cu-Ni composite silicate. The CIP and total organic carbon (TOC) removal rates were increased by 51.09% and 18.72%, respectively, under optimal conditions, compared with ozonation alone. The adsorption of Zn-Cu-Ni composite silicate, ozone oxidation, and ·OH oxidation synergistically promoted the efficient removal of CIP. This study provides valuable catalytic ozone technology for degradation of antibiotics in wastewater to reduce environmental pollution with potential practical applications.

An amorphous copper silicate catalyst was prepared using Cu(NO3)2 and Na2SiO3 & BULL;9H2O as precur-sors. Characterization of amorphous copper silicate was accomplished by several techniques, includ-ing X-ray diffraction, X-ray photoelectron spectroscopy analysis, scanning electron microscopy, transmission electron microscopy, thermogravimetry-differential thermal curves, Fourier-transform infrared spectroscopy, and nitrogen adsorption-desorption. The results of characterization showed that Cu-Si binary oxide and CuO were formed on the surface of amorphous copper silicate and contained abundant functional groups. The dosages of the catalyst, ozone, and humic acid affected the removal efficiency of p-chloronitrobenzene (p-CNB). A hydroxyl radical (& BULL;OH) scavenger exper-iment, electron spin resonance (ESR) analysis, and pH experiment demonstrated that & BULL;OH was the predominant reactive specie for p-CNB degradation. Catalytic reusability studies demonstrated that amorphous copper silicate maintained its catalytic activity and stability for five consecutive cycles.

针对喷气织机车间空压机夏季运行能耗高、压缩空气含水量大的问题,探讨空压机采用吸气预处理措施的可行性.根据工程热力学基本理论和湿空气状态参数计算方法,计算空压机在压缩不同吸气参数湿空气时的理论功率.以实际运行的某空压站为例,分析了影响空压机能耗和压缩空气含水量的因素,并对空压机吸入空气进行预处理.结果表明:在高温高湿季节对空压机吸入空气进行降温除湿处理,在计入预处理成本的情况下,折合吸气温度每降低10℃,空压机能耗平均降低2.9％.认为:采用吸气预处理措施可降低空压机的运行能耗,改善压缩空气质量.

The stratification problem of phase change microcapsule suspensions seriously affects their heat transfer performance enhancement and plagues their practical applications. The agglomeration between microcapsule particles is one of the main reasons for their stratification. According to the colloidal shear thinning effect, the shear force generated by stirring can destroy the agglomeration. In this paper, we investigated the effect of different stirring times and rates on the stratification pattern of phase change microcapsule suspensions formulated with paraffin phase change microcapsule particles (phase change temperature of 5-7 °C) after stratification by prolonged resting and restoration of suspension characteristics by stirring. The results show that the stirring time and stirring speed have positive effects on the maintenance of suspension of phase change microcapsule suspensions to a certain extent, but attention should be paid to the damage to the microcapsules during stirring. The results of the study have contributed to the enhanced heat transfer in phase change microcapsule suspensions as well as to the material lifetime.

R290 refrigerant offers good environmental protection and thermodynamic characteristics. The feasibility of R290 replacing R134a was summarized through theoretical analysis and experimental tests in this paper. A coiled ice storage experimental test platform was built, and the performance of R290 and R134a cool storage air conditioning systems was analyzed. The experimental analysis confirmed that the R290 system has a higher volumetric refrigerating capacity, and the system COP (coefficient of performance) is comparable to the R134a system. At the same evaporation temperature, the pressure ratio and exhaust temperature of the R290 system are lower than those of the R134a system. In addition, the charge amount of the refrigerant can have an impact on cold storage performance. It was found that the optimal charge range of R134a is 1300–1400 g, and that of R290 ranges from 500 to 600 g. The optimal charge amount for R290 is only 43–46% of R134a. A lower charge amount is beneficial to reduce the explosion risk of the R290 cool storage air conditioner. Under the optimal charge, the R290 system has a fast cooling rate and shorter cooling storage time, and the average specific refrigerating effect is increased by approximately 52% compared with R134a.

Iron–manganese silicate (IMS) was synthesized by chemical coprecipitation and used as a catalyst for ozonating acrylic acid (AA) in semicontinuous flow mode. The Fe-O-Mn bond, Fe-Si, and Mn-Si binary oxide were formed in IMS on the basis of the results of XRD, FTIR, and XPS analysis. The removal efficiency of AA was highest in the IMS catalytic ozonation processes (98.9% in 15 min) compared with ozonation alone (62.7%), iron silicate (IS) catalytic ozonation (95.6%), and manganese silicate catalytic ozonation (94.8%). Meanwhile, the removal efficiencies of total organic carbon (TOC) were also improved in the IMS catalytic ozonation processes. The IMS showed high stability and ozone utilization. Additionally, H2O2 was formed in the process of IMS catalytic ozonation. Electron paramagnetic resonance (EPR) analysis and radical scavenger experiments confirmed that hydroxyl radicals (•OH) were the dominant oxidants. Cl−, HCO3−, PO43−, Ca2+, and Mg2+ in aqueous solution could adversely affect AA degradation. In the IMS catalytic ozonation of AA, the surface hydroxyl groups and Lewis acid sites played an important role.

探讨新型纺织车间多风机送风系统运行设计优化方法.针对新型纺织车间需要多台风机并联送风的问题,依据轴流风机并联运行特性规律,结合常用的多风机并联运行系统形式和特点,分析影响并联风机性能的主要因素.提出并联风机设计选型时风机型号、规格、台数、运行速度、公用回路阻力等参数的基本要求.认为:并联各风机型号、规格、运行速度应尽量一致,公用回路阻力应保证在最低风机全压的30％以内,各风机送风回路压力损失之和的差异要小于10%.

基于工程认证需求,针对目前燃气输配课程教学存在的局限性,探索一系列的具体改革措施,进一步调动学生的学习积极性,提高学习效率,提升学生的工程素质和工程实践能力.

立足于流体力学教学实践,从所采取的教学模式、教学方法、考核方式等方面来探索提高流体力学课程教学质量的方法,调动学生的学习积极性,提高学习效率,促进学生知识内化.

基于CFD软件,建立车载移动冷柜系统蒸发器仿真计算模型,并实验验证模型的准确性,选取R134a为工质,计算分析了不同质量流量对柜内温度分布的影响.研究表明:环境温度为305K,质量流量为20kg/m2·s～22kg/m2·s时,运行15min后,箱体内平均温度接近273K;当运行2h后,最低温度约248K,且温度分布均匀;最快冷却速度为0.5h,比国家标准提高了2.5h.

A model was established for solar ejector-compression refrigeration system. The influence of generator temperature, middle-temperature, and evaporator temperature on the performance of the refrigerant system was analyzed. An optimal generator temperature is found for maximal energy efficiency ratio and minimal power consumption.

基于目前高校专业选修课的现状,笔者根据自身讲授“热泵技术”这门课的亲身体会,从教学内容的设定以及教学方法的多元化两方面提出了几点建议,以促进专业选修课的发展,提高其质量.

综述了近年来复合热源热泵技术的研究现状和发展前景。首先对复合热源热泵进行分类,然后提供多种公开发表的有关复合热源热泵的研究成果,在此基础上,指出目前复合热源热泵技术推广应用的局限性。