黄陵县水土流失现状及分区防治对策

在对黄陵县水土流失现状分析的基础上,进行了水土流失重点防治三区划分,划定了水土流失重点预防保护区、重点监督区和重点治理区范围,并针对分区的水土流失特点,提出了防治对策和措施,对指导当地水土保持和生态环境治理工作有一定现实指导意义。     

Fractions and Bioavailability of Soil Inorganic Phosphorus in the Loess Plateau of China under Different Vegetations

Plants play an important role in soil phosphorus nutrition. However, the effect of plants on phosphorus nutrition in soils of the Loess Plateau of China is not well understood. This study was conducted to reveal the relationships between plants and phosphorus' fractions and availability in the Loess Plateau of China. Twenty-two plant communities were surveyed and soil samples under different plant canopies were collected for the determination of soil properties and inorganic phosphorus fractionation. The results showed that Leguminosae and Lilaceae reduced pH and increased organic matter, cation exchange capacity, total and Olsen phosphorus in soils under their canopies, while Labiatae and Rosaceae increased pH and decreased organic matter, cation exchange capacity, total and Olsen phosphorus in soils under their canopies. The contents of Ca2P, CasP, AI-P and Fe-P were highly related with soil Olsen phosphorus. They were all higher in soils under Leguminosae and Lilaceae and lower in soils under Labiatae and Rosaceae. The results of this study indicate that Leguminosae and Lilaceae improved phosphorus nutrition in soils, yet Labiatae and Rosaceae impeded the improvement of phosphorus nutrition in soils under their canopies, which will be of more help to instruct vegetation restoration in the region and provide information for soil development.     

PVC树脂气流干燥塔改造小结

分别从工艺和设备角度分析了气流干燥塔发生落料的原因,通过提高风机送风量,并在气流干燥塔进料段下方增设喉管,较好地解决了落料问题,增加了装置生产能力,提高了产品质量。     

氯碱化工废水综合利用

介绍了氯碱生产各装置区废水及蒸汽冷凝液的综合利用情况。通过优化工艺设计最大程度实现了水资源综合利用。     

PVC生产中电石粉尘回收利用

介绍了电石法PVC树脂生产企业对破碎、输送过程中产生的电石粉尘采用合理工艺进行回收利用,通过实际数据说明该工艺具有显著经济效益和社会效益。     

70m~3聚合釜PVC生产过程的安全控制

阐述了70 m3聚合釜的入料及反应过程中的安全控制方法及应急救援预案,详细介绍了聚合反应过程中异常现象的判断及应对措施,停电情况下的紧急处理措施,并对DCS系统的改进提出了建议。     

改善PVC干燥系统 提高产品质量

介绍了PVC干燥系统的设备、工艺改造情况。通过改造,减少了落底料,提高了产品合格率。     

氯乙烯精馏尾气冷凝工艺的改进

分析了氯乙烯精馏尾气冷凝工艺中存在的不合理因素,通过实施相关的改进措施,使一次尾排气体中氯乙烯含量合格率提高到95％以上,减小了尾气回收装置的负荷,达到节能减排的效果。     

自备热电站锅炉燃烧器节能技术改造

介绍了对自备热电站锅炉燃烧器的技术改造内容。通过改造,锅炉出力显著提高,单台锅炉年节约标煤6820t且减少了环境污染。