Cold box structure with cold box panels partly built-in and installation method therefor

Abstract

Disclosed are a cold box structure with cold box panels partly built-in and an installation method therefor. The cold box structure is mainly applied to plate-fin heat exchangers, and in particular to high-pressure aluminum plate-fin heat exchangers. The cold box structure comprises a base, a cold box support frame, four cold box panels, and a cold box top plate, and a plate-fin heat exchanger is placed inside the cold box. Some of or all the four cold box panels can be placed inside the cold box support frame as needed. The cold box structure can protect the cold box support frame from being damaged by cryogenic steam ejected from the plate fin-heat exchanger due to leakage, and further enables the discovering of leakage situations of the plate-fin heat exchanger from outer surfaces of the cold box panels in a timely manner.

1 - 6 . (canceled) 
     
     
         7 . A cold box structure comprising a cold box support frame, four cold box panels, a base and a cold box top plate, a plate-fin heat exchanger being placed inside the cold box support frame, and perlite sand being filled between the cold box and the plate-fin heat exchanger, characterized in that the cold box panels facing seals of the plate-fin heat exchanger are located inside the cold box support frame. 
     
     
         8 . The cold box structure as claimed in to  claim 7 , wherein the cold box support frame and the cold box panels are made of carbon steel or stainless steel. 
     
     
         9 . The cold box structure as claimed in to  claim 7 , wherein the cold box panels facing lateral plates of the plate-fin heat exchanger are located outside the cold box support frame on sides. 
     
     
         10 . The cold box structure as claimed in to  claim 7 , wherein the cold box panels facing lateral plates of the plate-fin heat exchanger are located inside the cold box support frame on sides. 
     
     
         11 . An installation method applicable to the cold box structure of  claim 7 , the method comprising the steps of:
 a. affixing a cold box base, installing a cold box support frame, and installing a plate-fin heat exchanger inside the cold box support frame;   b. installing four cold box panels, wherein the cold box panels facing seals of the plate-fin heat exchanger are installed inside the cold box support frame on sides, and the cold box panels facing lateral plates of the plate-fin heat exchanger are installed inside or outside the cold box support frame on sides;   c. installing a cold box top plate at the top of the cold box support frame; and   d. welding the parts of the cold box in a sealed manner, filling the cold box with perlite sand.   
     
     
         12 . The installation method as claimed in  claim 11 , wherein the cold box panels facing the seals of the plate-fin heat exchanger are installed in advance inside the cold box support frame on the sides. 
     
     
         13 . The installation method as claimed in  claim 11 , wherein the cold box panels facing the seals of the plate-fin heat exchanger are installed on-site inside the cold box support frame on the sides. 
     
     
         14 . The installation method as claimed in  claim 11 , wherein step d further comprises charging the cold box with nitrogen after filling the cold box with perlite sand.