硒精炼车间工程设计实践

硒是一种用途非常广泛的稀散元素,本文在国内某硒精炼车间设计实践的基础上,对该硒精炼车间设计中的若干工艺参数、设备选型、厂房配置进行了归纳和总结。     

Introduction of Karamay Petrochemical Company

Established in 1959, Karamay Petrochemical Company（KPC） is an oil refining enterprise directly managed by PetroChina. It is located in Karamay Oilfield in the northwestern Xinjiang.     

航空交流电源系统仿真器的设计

介绍一种航空交流电源仿真器的设计，它采用微处理器通过SPWM控制，为了仿真航空电源的三相交流电源系统的正确信号与故障时的信号，是一个电压与频率变化的信号发生器。论文给出了变压变频控制方法．硬件结构和软件流程。该仿真器实现了多路的变频变压电源信号的控制。     

Study on Laboratory Method for Refining of SR Diesel Fuel

The method for refining the straight-run diesel fuel was studied in laboratory scale in order to make the acid number of diesel fraction comply with the standard while removing the naphthenic acids contained in diesel without causing environmental pollution. After comparing the effect of refining using three solvents, the isopropyl alcohol-HOA was specified as the best solvent. Meanwhile, the relationship between the acid number of diesel fraction and the amount of solvent used and the relationship between the concentration of solvent and temperature and the stability of diesel in terms of its acid number were also investigated. Experimental results had shown that when the mass fraction of the HOA-IPA solvent was 20% at a dosage of 17 mL of the solvent and a temperature of 30℃, the acid number of the refined diesel fraction was 0.015 mg KOH/g with a good stability of acidity in the diesel fraction,     

Construction of One-Million-Ton-Class Ethylene Project Kicked off at Dushanzi

The construction of a 10-Mt/a oil refining and 1.0 Mt/a ethylene project at PetroChina Dushanzi Petrochemical Company （DPC） was kicked off in August 2005. This project includes 20 petroleum refining units and 12 chemical units with the budgeted investment amounting to 26.2 billion RMB. The construction of refining units is expected to be finished in 2007, while the construction of chemical units is slated for completion in 2008. After commissioning of the process units a production capacity of 5.5 Mt/a of finished petroleum products and 1.82 Mt/a of chemical products will be formed.     

文章摘要的写作要求

（1）用第三人称。作为一种可供阅读和检索的独立使用的文体，摘要只能用第三人称而不用其他人称来写。 （2）简短精炼，明确具体。简短，指篇幅短，一般要求50～300字（依摘要类型而定）；精炼，指摘录出原文的精华，无多余的话：明确具体，指表意明白，不含糊，无空泛、笼统的词语，应有较多而有用的定性和定量的信息。     

DSP在电机测速中的应用

DSP目前被广泛应用于许多领域，例如数字通信，图像处理，电机控制等方向。本文以TI公司的TMS520LF2407A芯片为例、介绍了DSP在电机测速中的应用，由于TI的2000系列芯片内含捕获单元和正交编码脉冲(QEP)电路，所以可以很方便地用于电机测速和控制。     

SGJ系列铝液精炼及变质效果检测仪

SGJ-Ⅰ型铝合金液精炼效果在线快速检测仪采用减压凝固试样、密度测试方法，定性与定量测试相结合，可广泛应用于各种铝合金的精炼效果检测，使用方便、测试数据准确、快速，在铝合金液精炼后静置的5分钟，即可得到铝合金液精炼效果，保证了铝铸件生产中精炼工序可靠性。SGJ-Ⅱ型铝合金液精炼、变质效果在线快速检测仪是在SGJ-Ⅰ铝合金液精炼效果在快速检测仪基础上研制开发的二代产品，     

高功率偏心炉底出钢电炉—LF冶炼合金结构钢

在４５ｔ高功率偏心炉底出钢电炉－６０ｔＬＦ生产线上进行了冶炼工艺研究，钢种包括弹簧钢Ｄ６０Ｓｉ２ＭｎＡ。合金结构钢４０ＭｎＢＨ，４５ＭｎＢＨ，４０ＣｒＨ，４０Ｃｒ及碳素结构钢，对初炼炉熔氧过程升温，各种合金元素变化，出钢过程降温，钢包初合金及ＬＦ精炼微合金化，冶炼时间及ＬＦ精炼时间变化，杂质元素磷，硫的变化等进行了深入研究，该工艺路线冶炼的钢种化学成分稳定，高倍，低倍，力学性能，淬透性，晶粒度等项