Heat exchanger will have problems in the use of the process, also need to repair, especially seals it, to see if it is loose. Xiao Bian will introduce the matters needing attention when the maintenance of plate heat exchanger:

Heat exchanger is a process of industrial equipment in heat exchange technology is an important part in. The elastic sealing gasket which is sealed between the plate heat radiating fins (see Table 1) is a wearing part, and is also an aging part under the natural condition. Its service life has an important influence on the service life of heat exchanger. If the seal is hardened and the original elasticity is lost, the heat exchanger can not work properly.

Elastic gasket softening associated with pressure and temperature, when the gasket loses its elasticity, the heat exchanger will leak. In some of the products, in order to solve the leakage phenomenon caused by the aging of the gasket, allowing the heat exchanger sealing performance adjustment, namely again combined heat exchanger tightening bolt, pressing force adjusting each heat exchanger between the elastic sealing pad, solve the leakage problem. The function of the heat exchanger on the nameplate, generally gives maximum and minimum stress. For the new heat exchanger, the minimum allowable stress should be used for connection and fixation. As each film heat exchanger number can be one or more times to adjust the heat exchanger tightening force, every time when tightening the nut can be screwed in the 3mm, and in the process of tightening the adjustment sheet always pay attention to the stress, and is only allowed to heat exchanger without working pressure, tightening force under the condition of room temperature adjustment, prevent leakage.

There is no heat exchanger produced the stress range of adjustment in the nameplate, general stress values are given in the drawing, in this kind of screw plate heat exchanger, tightening torque in any case should not be less than the numerical drawing, because the assembly quality, assembly and deformation of plate heat exchanger. When the tightening torque reaches the specified value, it is possible to replace the elastic gasket in a planned way. The heat exchanger used in important production equipment and corrosive medium, suggesting that a set of spare seals. The warehouse temperature of 18 DEG C, the transparent plastic packaging, sealing plate heat exchanger can be preserved for 3 years.

Sealing element fixing

In principle, the seal is divided into two types of adhesive fixation and non adhesive fixation. The shape of the seal should be consistent with the shape of the seal plate heat exchanger. It must be pointed out that the adhesive fixing method does not have any effect on the sealing function.

Non adhesive seal

Alignment: put the sealing ring in place

Put the sealing ring in the sealing groove

Compression: in the sealing groove, there is a gradual reduction of cross-section of the groove structure, so that the correct positioning of the sealing ring

Adhesive seal

According to the purpose of sealing gasket and sealing quality requirements, the use of different manufacturers of flexible sealant and non - harmonic sealant. Prior to bonding, steam and air flow should be used to completely remove the adhesive residue and the residual gasket. For sealing adhesive to reconcile, must be combined with the adhesive residue on the surface of the gasket and the residual burn as heat exchanger. Bonding in large quantities, the pool should be prepared to seal the liquid nitrogen frozen, ready for the heating furnace with a plate heat exchanger gasket for drying, heating temperature should be 160 degrees, if there are conditions, chemical cleaning with heat exchanger, in order to ensure the elimination of residual combined gasket bonded joints in plate type heat exchanger.