增设前置氢回收废酸,减少污染,提高效益

1 改造前概况我厂软水生产采用离子交换法氢——钠并联系统,使用树脂为732＃强酸阳离子交换树脂。氢离子交换塔＊采用30％HCl以喷射器输送逆流再生,再生浓度控制在2-3％。因我厂原水硬度高达5.2mmol/l,故(?)2600mm的氢离子交换塔设计单位耗酸量为60g/ml,再生比耗1.64。即正常再生一次需30％HCll910公斤。

利用前置氢治理废酸污染

采用前置氢水处理技术，对氢、钠离子交换水处理过程中产生的再生酸性废水进行吸收利用，实现达标排放，并使氢离子交换器运行周期延长，酸耗降低。

乙烯联合装置汽油加氢、芳烃抽提改进流程的技术经济分析

在不增加工艺装置数量,不增加石脑油原料消耗量的前提下,将70万t/a乙烯联合装置的乙烯、汽油加氢、芳烃抽提3套工艺装置的常规流程重新组合改进为新加氢(前置)和新抽提(前置)2个流程,并对新旧流程进行了技术、经济的比较分析。结果表明,与常规流程相比,新加氢流程和新抽提流程均可减少裂解结焦量,使装置的生产大检修周期由1年1次延长到2年1次,乙烯产量可分别提高4.32万t/a,3.33万t/a,三烯(乙烯、丙烯、丁二烯)、三苯(苯、甲苯、二甲苯)的总产量可分别提高9.28万t/a,13.57万t/a,其工程投资开始盈余年份可分别提前0.29 a,1.47 a。2个改进流程中新抽提流程的技术经济指标较佳。

活性污泥法废水处理技术的困境以及可能的出路

根据在欧洲工作的经验 ,总结了活性污泥法废水处理技术在当地面临的困境。指出 ,随着人们对环境质量要求的日益提高 ,现有废水处理技术已经不能完全满足水域和水源保护的要求 ,污水厂的作用应当包括拦截和去除有抗药性的病原体。作为储备有必要及时研究新型的废水处理技术 ,以应付将来在中国也会出现的类似局面。活性污泥法与微滤技术的结合可以提供新的出路。

Numerical study of effect of front cavity on hydrogen/air premixed combustion in a micro-combustion chamber

The micro-combustion chamber is the key component for micro-TPV systems. To improve the combustor wall temperature level and its uniformity and efficiency, an improved flat micro-combustor with a front cavity is built, and the combustion performance of the original and improved combustors of premixed H2/air flames under various inlet velocities and equivalence ratios is numerically investigated. The effects of the front cavity height and length on the outer wall temperature and efficiency are also discussed. The front cavity significantly improves the average outer wall temperature, outer wall temperature uniformity, and combustion efficiency of the micro-combustor, increases the area of the high temperature zone, and enhances the heat transfer between the burned blends and inner walls. The micro-combustor with the front cavity length of 2.0 mm and height of 0.5 mm is suitable for micro-TPV system application due to the relatively high outer wall temperature, combustion efficiency, and the most uniform outer wall temperature.