液氮系统

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Typical Bulk Liquid Storage Systems
Liquefied oxygen, nitrogen, argon, and carbon dioxide are stored on your site at very low temperature. When gas is required, the liquid is vaporized for supply to your process. For cryogenic applications such as food freezing that require a low-temperature liquid supply, the liquid is delivered from the storage tank to your process by an insulated line.
A typical installation normally consists of a tank, a vaporizer, and controls. Systems are selected based on your volume, desired pressure, purity level, flow rate, and operating pattern.

A typical liquid storage system used for argon, nitrogen, and oxygen.
Tanks
The storage vessels generally used for liquefied argon, nitrogen, and oxygen are 500-, 1,500-, 3,000-, 6,000-, 9,000-, and 11,000-gallon tanks. Liquid hydrogen storage vessels are nominally 1,500-, 4,500-, 9,000-, and 20,000-gallon tanks.


Cutaway of a typical tank.
Ambient Air Vaporizer
While steam and electric vaporizers are occasionally used, the most widely employed vaporizers obtain heat from the surrounding air. These "ambient air" vaporizers are provided in arrays of many-finned tubes to provide vaporization rates up to 40,000 scfh per array. Additional units are added to provide higher vaporization rates.
Control Manifold
Control manifolds are designed to control the pressure to your houseline and to protect that line from excessively cold gas or possible liquid carryover. The manifold consists of a temperature control valve and a pressure control valve. Also included are necessary block-and-bypass valves, as well as a pressure indicator and check valve. There are two basic units—one for rates up to approximately 23,000 scfh and another for rates up to approximately 43,000 scfh.

A typical control manifold.
*Note that the liquid storage system used in your region may be different; please check with your local office.

beiwei5du

针对于液氮系统的空气蒸发器上结冰是什么原因？？？如何解决（影响到相应的液氮蒸发效率）？？？@石头968

690188274

我也想知道这个问题的解决方法。知道的亲们分享一下哦

石头968

beiwei5du 发表于 2016-9-26 18:44
针对于液氮系统的空气蒸发器上结冰是什么原因？？？如何解决（影响到相应的液氮蒸发效率）？？？@石头968

湿度大，水份冷凝了

beiwei5du

石头968 发表于 2016-9-26 22:02
湿度大，水份冷凝了

两台的设备，其中一台ambient air evaporizer经常性结冰，而另一台则不常结冰，我个人觉得可能还是设计和选型的问题，而不应该是外界的原因。我查一查。

beiwei5du

不知道是否有企业在液氮系统中使用到temperature control valve（温度调节阀）呢？？？这种安装设计的安装是不是有意义呢？？@石头968

石头968

beiwei5du 发表于 2016-9-27 11:27
不知道是否有企业在液氮系统中使用到temperature control valve（温度调节阀）呢？？？这种安装设计的安装 ...

气体中的水份到了露点，一定会冷凝结露，结露的水到了冰点一定会结冰。

小金库

非常感谢分享