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设计一个低温气体系统,Designing a Cryogenic System


●发布时间:2012-10-16  ●   ●信息来源:上海皇龙自动化工程有限公司  ●作者:本站编辑

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CONCOA低温系统设计用于保证需要的应用气体的压力和流量。液态气罐的性能常常被人有所误解。液态气 罐的技术指标常常列出气相回流在350-400cfh的范围。然而,实际上最大可承受的没有压降的流速仅仅在200-250 cfh。限制因素在于气罐的压力常常形成环流(coil circuit)。

要克服这种状况,使用者可以使用液态回流阀连接到外部蒸发器上去。在液态气瓶压力构成回流之前和压力回 落之前,可以达到700-800cfh的流速几个小时。如下图所描述的,CONCOA将630系列低温汇流排, 629系列排气包 与一个以扩展液态罐性能到超过4,000cfh的辅助建立压力回路结合到一起。

这个可以这样达成:使用从一个附加气 瓶调节气相,将连接到630系列汇流排的供气罐的液体压出。

无论从低温汇流排压出的液体量多少,蒸发器选型都 必须是1.5倍于希望的流量大小。环境温度对蒸发器的性能至关重要,因此蒸发器的安装位置与布置都必须有所考虑。设计的系统在同CONCOA的IntelliSwitch系列全自动电子切换系统一起工作时,可以连续操作。

其关键之处在于让CONCOA的低温系统输出。

美国CONCOA公司低温气体系统

美国CONCOA公司低温气体系统

CONCOA cryogenic systems are designed to maintain the pressure and flow of demanding applications. Liquid can performance is often misunderstood. The liquid can specificationstypically list gas phase withdrawal in the range of 350-400 cfh. However, in practice themaximum sustainable flow rate without pressure drop is only 200-250 cfh. The limiting factoris often the can’s pressure building coil circuit.

To overcome this condition the user may use the liquid withdrawal valve connected to an external vaporizer. Flow rates of 700-800 cfh are achievable for a couple of hours beforethe liquid cylinder’s pressure building circuit is saturated and pressure falls. As illustrated below CONCOA has packaged the 630 series cryogenic manifold, 629 series vent kit and an auxiliary pressure building circuit to extend liquid cans performance to over 4,000 cfh. This is achievable by using the regulated gas phase from an additional cylinder to push liquid out of each supply can connected to the 630 manifold. Regardless of the volume of liquid pushed out of the cryogenic, manifold the vaporizer must be sized 1.5 times the desired flow capacity. Ambient temperature is vital to the vaporizer’s performance so location and geography must be considered.

A continuous operation is achievable when coupled with CONCOA’s IntelliSwitch series automatic switchovers. The bottom line is CONCOA cryogenic systems deliver the results.



 
 
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