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Reaction vessel welding knowledge

&Nbsp;      reactor when many factors influencing the thermal cracking process, such as joint, process specification, the preheating temperature, structure rigidity and workpiece clamping condition on weld hot cracking resistance, such as ability to have certain effects. Welding technology and specifications. Using high current, fast weld, welding, line single layer games, easily lead to technological measures of welding stress will lead to thermal cracks. When conditions permit, should be used for low current, multi-layer welding, in order to reduce hot cracking tendency.
welding structural stiffness of workpiece, preheating method is often used. Preheating can reduce the cooling rate, slowing the tensile stresses generated during the cooling process, on the other hand can improve the crystallization conditions, reduce the amount of chemical and physical heterogeneity. Preheating temperature according to the steel's chemical composition and structural stiffness depending on the size. The higher carbon content in steel and other alloying elements more greater stiffness is required preheating temperature is higher.
welding reactor orders. Same material weldability and welding, welding in different order, thermal cracking is also different. Because different order of different welding welding stress. Should minimize the welding stress by using the proper welding order.
reactor Kettle kettle for the determination of thickness of wall thickness determined by "internal pressure strength of thin-walled cylinder and head design" and "design of external pressure cylinder and head" method.
specific method is to be at positive pressure in the reactor operation, and when the pressure is greater than the jacket in the kettle, kettle wall thickness shall withstand the kettle body strength and under a jacket pressure stability of the calculated two value whichever is the greater. When positive pressure within the vessel operations, but when the pressure is less than jacketed pressure and kettle body determined by the stability calculation of wall thickness, not subject to external pressure head of the strength calculation of wall thickness. When the reactor is negative pressure operation, jacket should be within the internal pressure and negative pressure within the vessel as Kettle body design pressure without jacket pressure effects on the head, and wall thickness can be determined by external pressure. For ease of welding, often take on the head and cylinder wall thickness.
reactor jacket structure of heat transfer and structural jacket jacket jacket of the type commonly used in the form of whole structure types there are four types of
a-type only part of the cylinder jacket, used to heat small occasions.
b-cylindrical part of the jacket and head package, are the most common structure.
c-type is taken into account when the cylinder under external pressure to reduce the cylinder of length l, or to implement control above the jacket.
d for the whole package-type jacket, compared with the first three, maximum heat transfer area.
when a jacket closed not directly bent to shape by clamping sleeve, closed between clamping sleeve and full penetration butt welds should be used, in order to ensure penetration should be added padding. Make more trouble, but shell has a strengthening effect. Convenience of surface losses, strength. Jacket has taken over the edge, causing trouble, last resort do not use. Takes over the whole structure on the jacket jacket on the discharge connection and containers in General, no special processing is required. Inlet pipe should take certain measures in the welding is a jacketed wall bezel. It should be noted that the inlet pipe or steam bezel opening area shall not be less than taking over the channel's cross-sectional area.

 

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