Temporary stop operation of air separation unit

Temporary shutdown operation of air separation unit: during shutdown, due to the large amount of backflow liquid oxygen in the main heat exchanger, the residual air in the inlet air pipe of the medium pressure expander is rapidly liquefied. Once the air separation unit is restarted, the residual liquid in the channel will be vaporized rapidly after the positive flow air enters, which will cause the safety valve to trip. Therefore, when the air separation unit is restarted again, the heating and blowing valve on the inlet air pipe of the expander must be opened in advance.

News of Temporary stop operation of air separation unit

Kaifeng DEAR air separation and Shaangu Group signed contract of KDON (Ar) - 28000 / 28000 / 850 air separation unit for Panhua Group in Philippines

Dec 11, 2020

On December 7, 2020, Kaifeng DEAR air separation Industrial Co., Ltd. (hereinafter referred to as: DEAR air separation) and Shaangu Group once again j

Faq of Temporary stop operation of air separation unit

Installation requirements for cold box of air separation unit

1.The cold box foundation is divided into frame type and non frame type. The levelness of top surface of frame type frame shall not exceed 1 / 1000. All sections of the frame shall be placed vertically. All bottom plates of non frame type cold box shall be kept at the same level, and the levelness shall not exceed 1 / 1000. 2.When installing the cold box plate, the adjacent two sides can beassembled into a whole piece or angle type on the ground. The length error of each diagonal line a...

Dec 23, 2020

Change of liquid air and liquid oxygen surface during temporary shutdown of air separation unit

When the air separation unit is in normal operation, the liquid flows down and can only flow on the tray and flow to the lower tray through the overflow bucket because the supporting force of the rising steam prevents the liquid from flowing down from the small hole of the tray. After shutdown, due to the interruption of rising gas flow, the liquid on the tray can flow from the overflow bucket to the lower tray, and also can flow through the small hole on the tray to the lower tray. This will cause the surface of liquid oxygen and liquid air rise, which may exceed the position of the expansion air outlet pipe, resulting in liquid carrying accident of the expander during restart. Therefore, pay attention to the liquid level position when stopping.

Dec 16, 2020