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首页> 外文会议>41th Annual Conference of Metallurgists of CIM International Symposium on New Technology Implementation Metallurgical Processes Aug 11-14, 2002 Montreal, Quebec, Canada >Capture and recycle for emission reduction of sulfur hexafluoride in magnesium casting
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Capture and recycle for emission reduction of sulfur hexafluoride in magnesium casting

机译：捕集并循环利用以减少镁铸件中六氟化硫的排放

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The Magnesium Corporation of America (MagCorp) and Air Liquide entered into a partnership to develop a technique and demonstrate its potential to reduce sulfur hexafluoride emissions from magnesium casting operations. Air Liquide has developed a process to recover and recycle SF_6: the FLOXAL SF_6 Recycle System. The process, which includes proprietary membrane technology, separates the SF_6 from the exhaust gas in four stages: pre-treatment, compression, separation and recycle. This system is capable of capturing dilute SF_6 in the parts per million (ppm) range from a casting machine exhaust and recycle it as a re-concentrated feed gas in percentage levels. To benchmark the process in a magnesium casting environment, a test program was conducted in three phases: an initial visit to define the scope of the project (Phase 1), an on-site analytical campaign to characterize the emissions of the casting process and provide a mass balance on the SF_6 (Phase 2), and a technology demonstration campaign to measure the performance of the FLOXAL separation unit while in operation at an industrial site (Phase 3). Preliminary results show that the FLOXAL separation unit, after one month of service, had a 90% (or better) recovery rate of SF_6 supplied to its inlet. The separation unit produced concentrations of SF_6 at approximately 34 ppm in the permeate (vent) while concentration of the product was about 0.4%, equivalent to the target concentration of SF_6 in MagCorp's fresh cover gas. The separation unit successfully increased on average the concentration of the diluted SF_6 from the casting system exhaust by a factor of 10.
机译：美国镁公司（MagCorp）和液化空气集团（Air Liquide）建立了合作伙伴关系，以开发一种技术，并展示其减少镁铸造业务中六氟化硫排放的潜力。液化空气公司开发了一种回收和再循环SF_6的过程：FLOXAL SF_6再循环系统。该工艺包括专有的膜技术，可在四个阶段将SF_6与废气分离：预处理，压缩，分离和再循环。该系统能够从铸造机排气中捕获百万分之一（ppm）范围内的稀SF_6，并将其作为百分比浓度的再浓缩原料气进行再循环。为了在镁铸造环境中对工艺进行基准测试，测试计划分三个阶段进行：首次访问以确定项目范围（阶段1），现场分析活动以表征铸造过程的排放并提供SF_6的质量平衡（第2阶段），以及在工业现场运行时测量FLOXAL分离装置性能的技术演示活动（第3阶段）。初步结果表明，使用FLOXAL分离装置一个月后，提供给入口的SF_6的回收率达到90％（或更高）。分离单元在渗透液（通风口）中产生的SF_6浓度约为34 ppm，而产物的浓度约为0.4％，相当于MagCorp的新鲜覆盖气体中SF_6的目标浓度。分离单元成功地将铸造系统排气中稀释的SF_6的平均浓度平均提高了10倍。

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