Type of sealing gasket used for spiral plate heat exchanger equipment:
There are many structural forms of sealing gasket used in spiral plate heat exchanger, including rectangle, trapezoid, hexagon, Pentagon and so on. The commonly used forms also include two types: one is that the upper part of the cross section of the sealing gasket is pointed; the other is that the upper part is plane.
One form of spiral plate heat exchanger equipment is to increase the deformation degree of sealing gasket by the size difference to the middle part. Its structural design is actually plane seal, but non-linear seal. Because the bottom of plate sealing groove is plane, this structure can offset some defects when the bottom plane of plate sealing groove has defects. The purpose of the second design, in fact, is to reduce the compression of the sealing gasket, and its compression form is plane compression.
As for the sealing gasket of spiral plate heat exchanger, the cross section of the gasket corresponding to the sealing groove makes the assembly easier and improves the pressure bearing capacity of the plate. Generally, the ratio of the compression of the sealing gasket to its original thickness, that is, the compression ratio, is used as the design basis of the sealing gasket. Based on many years of design experience and analysis of a large number of sealing structures of plate heat exchangers at home and abroad, the author thinks that it is ideal to control the compression ratio between 20% and 25%.
The improvement of the surface heat transfer coefficient of the plate by the spiral plate heat exchanger is as follows
Because the ripple of the spiral plate heat exchanger can make the fluid turbulent at a lower velocity (Reynolds number 150), it can obtain a higher surface heat transfer coefficient, which is related to the geometry of the plate ripple and the flow state of the medium.
The waveforms of spiral plate heat exchanger equipment plate include herringbone, straight, spherical and so on. After years of research and experiments, it is found that the herringbone plate with triangular corrugated section has a higher surface heat transfer coefficient, and the larger the angle of corrugated section is, the higher the medium flow velocity in the channel between plates will be, and the greater the surface heat transfer coefficient will be.