共查询到19条相似文献,搜索用时 171 毫秒
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由山东济钢化工厂和清华大学于2011年5月10日宣布联合改造实施的负压蒸氨新工艺实现突破,装置已经连续运行1个多月。与传统的常压蒸汽蒸氨工艺相比.新技术每年减少蒸汽用量数万吨,显著降低了蒸汽消耗,减少了污水处理费用。中国炼焦行业协会评价负压蒸氨工艺是一项革命性的焦化剩余氨水蒸馏处理新技术。 相似文献
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《燃料与化工》2020,(1)
正本实用新型涉及一种对真空泵前氨气进行脱氨处理的负压蒸氨设备,煤气系统采用生产硫铵的氨回收工艺时,用硫酸在酸洗塔内吸收氨;其设备包括酸洗塔、循环液泵、循环液冷却器、定比例混合器或硫酸计量泵、浓硫酸槽和连接管道;煤气系统采用磷铵洗氨生产无水氨、氨气或浓氨水的氨回收工艺时,用磷酸或磷铵在酸洗塔内吸收氨;其设备包括酸洗塔、循环液泵、循环液冷却器及连接管道;与现有技术相比,本实用新型的有益效果是:(1)避免了负压蒸氨尾气中的氨对液环式真空泵性能及运行造成不良影响,提高真空泵的使用寿命,减少真空泵的维护量,可有效提高企业经济效益;(2)避免了氨对真空泵真空度的影响,保证负压蒸氨系统的稳定运行。 相似文献
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分析了传统水蒸汽蒸氨的缺点,介绍了几种蒸氨新工艺,着重介绍了烟道气余热负压蒸氨,最后提出了选择蒸氨工艺的建议。 相似文献
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将超重力法氨水吹脱制氨技术用于选择性催化还原(SCR)脱硝工艺(需氨5vol%~10vol%),以空气?氨水为实验体系、旋转填料床为吹氨设备,考察了进气温度、超重力因子、气液体积比在装填不同填料时对脱氨率和产氨率的影响规律。结果表明,处理气量为4~10 m3/h时,丝网和乱堆两种不锈钢填料的吹脱率均随进气温度、超重力因子和气液体积比增大而增大;产氨率随进气温度和超重力因子增大而增大,随气液体积比增大而降低,产氨率达10%以上,与SCR法所需浓度一致,表明超重力氨水吹脱所制氨浓度可用于SCR脱硝。处理气量为50?700 m3/h时,吹脱浓度1wt%的氨氮废水,产氨率最大为3.0%。虽不满足SCR脱硝要求,但可将氨氮废水吹脱和氨水吹脱工艺相结合,节约氨水消耗量。 相似文献
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In this work modelling and experimental validation of an integrated process for the removal of carbon dioxide from ammonia solutions - the so called decarbonisation - is presented. In this process, carbon dioxide and small amount of ammonia is stripped out from the solution at ambient pressure in a packed column. Recovery of the stripped ammonia can be reached by combining absorption of ammonia and condensation of stripping steam. The integration of stripping, absorption and direct-contact condensation (DCC) can be achieved in one compact unit in which stripping takes place in the lower part of the packed column, and the DCC and ammonia absorption in its upper part. This unit has been modelled in a rigorous way considering heat and mass transfer as well as reaction rates in multicomponent reactive stripping, absorption and direct-contact condensation in packed columns (Ma?kowiak et al., 2009). Extensive experimental investigations in a pilot scale packed column with diameters of 0.15 and 0.32 m have been performed for both, the stripping and for DCC. Relevant operation parameters as well as column dimensions were varied during the experiments in order to investigate their influence on the selectivity of the decarbonisation and to achieve a broad data base for the validation. Experimental validation of the two sub-processes and the entire decarbonisation shows good agreement between calculated and experimental values. Based on the validated model a successful optimisation of the decarbonisation process in industrial scale has been performed, leading to increased carbon dioxide removal and reduction of ammonia losses. 相似文献
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为解决常压脱苯工艺存在蒸汽耗量高、废水产生量较多等问题,柳钢焦化厂引入负压脱苯工艺,通过降低操作压力有效降低蒸馏温度,并采用热贫油代替蒸汽供热,起到节能减排的作用。经过初期生产调试及工艺完善,系统运行稳定,与常压脱苯工艺对比,负压脱苯带来较好的环境效益。 相似文献