共查询到19条相似文献,搜索用时 109 毫秒
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针对洛阳分公司风氮系统存在空压机故障率高、氮压机能耗高、氮气后备系统工艺落后、操作控制不方便等问题,通过更新空压机、仪表风替代工业风、氮气后备系统改造更新、氮气和压缩空气资源优化、改变生产运行模式等措施,达到了节能降耗的目的。 相似文献
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为达到降低4000 m3/h空分设备运行成本的目的,改造氮气外供管线,停运外供氮压机。简介4000 m3/h空分设备流程、配套氮压机概况和氮气供应、使用情况,详细介绍改造方案和改造效果,阐述改造后操作时的注意事项。 相似文献
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石横特钢公司根据公司用氮压力的不同,将氮气分为中压氮气和低压氮气。对原氮气输送系统存在的压缩输送能耗高问题提出了解决方案:改造氮气输送管网,将低、中压氮气分开压缩输送,达到了既满足用氮需求,又降低氮气输送成本的目的。 相似文献
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为工农业生产和科研工作的需要,我们将23—300—1型分馏塔改装成氧氮双高纯度。开始由于氮气用量不多,我们没有专设氮气囊、氮压机和灌充设备,而采用氮气经氧气囊、氧压机进行充装的方法,但是要使气囊、管道清洗成高纯度氮气却要化费3~4小时的时 相似文献
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通过增设空气-污氮预热器,使污氮气吸收空压机的压缩热,从而提高污氮气温度,降低分子筛纯化系统中加热器的能耗,达到节能的目的。但预热器会使空分系统的阻力增加.进而使能耗上升。通过分析比较能耗降低量和因阻力而产生的能耗增加量,探讨增设空气-污氮预热器的经济性。 相似文献
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<正>济南钢铁公司氧气厂现有5台LW-40/8型氮压机,担负着供应总公司氮气的任务。长期以来,氮压机活塞杆带油严重,这一方面给活塞杆用氮气作为密封装置的4M12-59/30型氧压机造成隐患;另一方面增加了操作工定期清油的负担。 相似文献
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SVK8 3S型氮气压缩机是由沈阳鼓风机厂制造、为义马煤气配套的低压氮气压缩机 ,共两套 ,于 2 0 0 0年 1 2月开始调试。为节约工程基建资金 ,取消原设计两台中压氮气压缩机 ,由杭氧产两台3TYS89+2TYS60型氧气透平压缩机临时压送氮气 ,向外供中压氮 ,来取代中压氮气压缩机 ,流程示意图如图 1所示。图 1 氧、氮压机工艺流程配置图1 事故情况2 0 0 0年 1 2月 2 7日中午 1 1∶3 5 ,接总调度室通知 ,要求中午 1 2∶0 0向长输管线供中压氮气。当时 ,一台氮压机试车完毕正在运行 ,一台氧压机试车完毕压氧正在运行 ,将由氧压机临时压送氮气外供… 相似文献
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《低温学》2014
Liquefaction of natural gas is usually a kind of high energy consumption process. Therefore, any performance improvement of the liquefaction process will definitely reduce the energy consumption. Nitrogen expansion liquefaction process is regarded as a suitable process for small-scale LNG plant due to its simplicity, quick startup and convenient maintenance. However, the disadvantage of the process is high-energy consumption. An efficient way to lower its energy consumption is to add a precooling cycle. In this paper, two different precooling cycles including propane precooling cycle and R410a precooling cycle are proposed to the nitrogen expansion liquefaction process to improve the liquefaction process performance. Unit energy consumption as an objective function is optimized in terms of several key operating parameters. Based on the optimization results, the effects of the liquefaction rate and methane recovery rate on the process performance are investigated. The thermodynamic analyses are adopted to the processes as well as the two precooling cycles. Furthermore, the exergy analyses of the main equipment are also presented and discussed. The results show that the unit energy consumption for the nitrogen expansion process with R410a precooling and with propane precooling reduce by 22.74% and 20.02% respectively, compared with nitrogen expansion process without precooling. 相似文献
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内压缩流程空分设备中,获得高压氮气有三种方式:液氮泵内压缩、上塔抽取低压氮气外压缩和下塔抽取压力氮气外压缩。利用UNISIM软件建立模型,模拟空分精馏过程,比较上塔抽取低压氮气外压缩和下塔抽取压力氮气外压缩两种获得方式对能耗的影响。在不同的下塔氮气流量与氧气流量比下选出合适的氮气获取方式,以实现能耗最低的目标。 相似文献
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快速冻结装置的节能新技术 总被引:1,自引:0,他引:1
在食品冷加工中,快速冻结是一个高耗能环节,除了制冷主机、辅机、快速冻结装置风机、传送机构耗能外,另一个重要耗能因素则是除霜和重新降温过程。一般认为,该过程耗能占总耗能15%左右或更多。实际表明,采用吹风快速冻结加工食品平均单位耗能约为300kwh/t左右。而含水率较高的食品如芦笋单位能耗高达373kwh/t,按平均0.72元/度计,电费268.56元/吨。因此降低快速冻结环节的耗能,降低加工成本是今后快速冻结装置的重要研究课题。快速冻结装置的各项节能新技术可以降低能耗30%,是一项可以给用户带来丰厚经济效益和应用前景十分可观的项目,同时对提高国产快速冻结装置的整体技术水平,实现技术突破具有重要意义。 相似文献
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介绍空分制氮装置采用膨胀机循环与液氮循环的两种工艺流程及能量平衡 ,示出了两种循环的实例比较。指出外供液氮可以作为冷源替代膨胀机 ,且单耗低、操作更方便 ,设备维护量更小、氮气提取率更高 相似文献
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Derek Hao Zhi-gang Chen Monika Figiela Izabela Stepniak Wei Wei Bing-Jie Ni 《材料科学技术学报》2021,77(18):163-168
Artificial catalytic synthesis of ammonia has become a hot research frontier in recent years.It is regarded as a promising approach that may replace the Haber-Bosch process and reduce global carbon dioxide emission.However,it is extremely difficult for the cleavage of nitrogen molecules under ambient con-ditions.Thus the ammonia yield rate is still low and the study is still limited in lab scale.If nitrites or nitrates are used as nitrogen sources,rather than nitrogen gas,the catalytic efficiency can be signifi-cantly improved,and the residual nitrate and nitrite contaminations in water systems can be efficiently eliminated and converted to energy sources at the same time.It is an emerging alternative for artificial ammonia synthesis,while there is not enough focus on the reduction of nitrate and nitrite.Herein,we systematically compared the differences between the reduction of nitrogen and nitrates,as well as listed the challenges in this area.The total conversion rate and energy efficiency of catalytic nitrate reduction are much higher than nitrogen gas reduction due to the much higher solubility and better converting pathway,which might be further enhanced by employing catalysts improvement strategies.Further,we also proposed suitable materials as well as a few future researches needs that may help boost the development of artificial ammonia synthesis using nitrate. 相似文献
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分析了中间抽气型三轴齿轮式氮压机的特点,对配置单台中间抽气型三轴齿轮式氮压机与配置两台氮压机两种方案进行比较后得出:前者一次性投资成本低、占地面积小、备品备件少、能耗和运行成本低。 相似文献