Heat exchanger is a kind of energy-saving environmental protection equipment which can keep the heat transfer of raw materials between two more fluids with different temperatures. It is an index that can make the heat transfer the fluid with higher temperature to the fluid with lower temperature, make the fluid temperature meet the requirements, so as to consider the necessity of processing technology standards. In addition, it is one of the key machines equipment to improve the utilization rate of power energy. But many people don't know the difference between single tube plate double tube plate heat exchanger. Let's share it with you.

　　Heat exchanger is an energy-saving environmental protection equipment which can keep the heat transfer in raw materials between two more than two kinds of fluids with different temperatures. It is one of the key machinery equipment to make the heat transfer the fluid with higher temperature to the fluid with lower temperature, so that the fluid temperature can meet the requirements, in order to consider the necessity of processing technology standards, to improve the utilization rate of electric energy. But many people don't know the difference between single tube plate double tube plate heat exchanger. Let's share it with you.

　　The main difference between the double tubesheet the single tubesheet is the isolation cavity, which is connected with the tube side shell side, does bear the medium pressure, but bears the mechanical load thermal load of the equipment. The capacity of the isolation chamber depends on the spacing of the double tubesheet. During the shell side hydrostatic test of the fixed double tubesheet, there may be leakage at the joint between the inner tubesheet the heat exchange tube, so it is necessary to consider the minimum space required for query leak detection when determining the interval between the double tubesheet.

　　Compared with single tubesheet, double tubesheet has much lower leakage probability better stress condition. the perspective of structure, the double tubesheet adopts the fixed tubesheet structure, the control cannot be pulled out for cleaning. The practical application shows that the double tubesheet heat exchanger manufactured by mechanical expansion method can meet the application requirements.

　　Structure comparison:

　　The double tubesheet heat exchanger adopts the fixed tubesheet structure, the control can be pulled out for cleaning. The single tubesheet can be selected a variety of structural types, the control can be pulled out for cleaning. For the double tubesheet heat exchanger with large temperature difference, corrugated expansion joint can be added on the simplified body; while for the single tubesheet, besides the corrugated expansion joint on the simplified body, floating head U-tube type is often used for compensation.

　　There are two planning concepts about the double tubesheet heat exchanger: one is that the double tubesheet heat exchanger is used to prevent the media mixing between the shell the tube. It is planned to install a drain valve on the cavity between the inner outer tubesheets for daily investigation discharge in case of leakage of the inner tubesheet, so that the medium in the shell tube is isolated by the inner outer tubesheets. This is the primary purpose of selecting double tube plate structure. The other is that the double tubesheet heat exchanger can be used in the case of large pressure difference between the tubesheet the shell. It is planned to participate in a medium in the cavity between the tubesheet the surface to reduce the pressure difference between the tubesheet the shell. This is the same as the general single tube plate, which cannot guarantee that the pipe orifice on the outer tube plate will leak.

　　Comparison in application:

　　Single tubesheet is common. In addition to sealing leakage of gasket bolt flange joint, leakage of pipe orifice on pipe plate welding crack will also occur in application. Most of the nozzle leakage on the tube sheet occurs at the welding arc stop. The gas is discharged clean there are sand holes during arc stopping.

　　The double tubesheet has double tubesheet inside outside. It is assumed that the inner tubesheet orifice leaks the outer tubesheet is protected. The welding crack of single tubesheet often occurs at the junction of the small cone end of the large flange plate the shell of the heat exchanger. The main reasons for the problems here are: first, the joint stress between the small end of the cone of the large flange the simplified body is large; second, several specifications shape sudden changes, simple buried defects.