Abstract
The urea synthetic tower is a high pressure container, therefore the tube experiences and observes wall very thickly , need to adopt multilayer steel plate wrap up, think to being high-handed, adopt therefore to go round simultaneous style, its benefit is to miss and not explode only.May produce corrosivity matter in the process of reaction , needing to adopt preservative material therefore Neibi is still import and export taking over disregarding being the tube body. Consider the effect arriving at the external world factor since the tower is comparatively high, want the core carrying out the wind turn school from loading and earthquake loading on the tower therefore. The tower tray design is very important , its goodness and badness has direct impact to the availability to the tower , the essential messenger of tower tray reaction thing designing that touches sufficiently , ability gets on the stick. The tower has two kinds sieve plate and whorl stream board , that unnatural distribution of whorl stream is that direction is contrary face a two piece of essential points each other, uses the reaction thing uniform distribution. Tower inner temperature is asked to maintain stability , is avoid big relocatability, lead to reaction can not be in progress regularly.
The urea synthetic tower giving birth to a child at present adopt single tubes to save multilayer wrapping up the deep ring brazing seam structure soldering the ring brazing seam again the day afer tomorrow commonly , solder queen heat treatment because of being caused by structure being able to not be in progress, the ring brazing seam there exists detecting no easier to concentrate a defect, and solder than big strain in location. This cause , the urea synthetic tower try one's best to avoid warning naturally adopt depths to be encircled by brazing seam structure, but suitable select and use other structure form. The urea synthetic tower being equal or less than 1800 mms to the diameter, adopt overall multilayer to wrap up structure step by step , demands the chemical industry industry standard "overall multilayer clamps the dyadic high-handed container " but consults (HG3129) concretely, the ring brazing seam and longitudinal brazing seam among whose laminated board should be smaller than 100 mms axial distance not to between respectively mutually, staggering , bordering the laminated board two rings brazing seam (the ring brazing seam conferring the body upon the head and the tube should not include). Brittleness breaks and resist strain corrosion splitting having significant effect , these defects, especially soldering the crack kind defect damage maximum , expanding to critical state in a single day, will may arouse the catastrophic accident at any time.
