What Are The Common Failures Of Heat Exchanger?
Heat exchanger fluid leakage
The main performance is leakage (quantity is not large, water drop discontinuity) and leakage (large quantity, continuous water droplet). The main part of the leak is the seal between the plate and the plate, the section of the seal leak and the end plate and the inner plate.
cause
The size of the clamp is not in place, the size is not uniform everywhere (the deviation should not be greater than 3mm) or the clamp bolt is loose.
Partial seal gasket is removed from seal groove, seal cover is covered with dirt, seal mat damage or plate heat exchanger seal gasket ageing.
The plates are deformed and the assembly displacement causes the running mat.
There is a crack in the part of the plate seal and the two sealing areas. Instance: such as Beijing, qinghai and xinjiang to multiple heating power station adopts saturated steam as a heat source heating, because the steam temperature is higher, at the beginning of the equipment operation system under the condition of unstable, rubber gasket failure at high temperature, caused by leakage of steam.
Processing method
In the absence of pressure state, press factory to clamping device provided by the clamping size, size should be uniform, compact size of deviation should be no greater than + / - 0.2 N (mm) (N). As the total number of sheets), the parallelism between the two hold-down plates should be kept within 2 mm.
Mark the outer part of the leak, then remove and reassemble or replace the gasket and plate.
Dissolve the heat exchanger, repair or replace the plate of the plate. When no plate spare parts can be temporarily removed and reassembled.
When reassembling the plates, clean the surface and prevent the dirt from sticking to the cover.
Heat exchanger internal string fluid
The main feature is the pressure and temperature anomalies of the medium in the lower side of the pressure. If the medium is corrosive, it can also cause the corrosion of the plate heat exchanger seal gasket. A series of fluids usually occurs in a diversion area or a second seal area.
cause
The plate corrosion can be cracked or perforated due to the improper choice of plate.
Operating conditions do not meet the design requirements.
The residual stress and the size of the clamp in the assembly are too small to cause the stress corrosion.
There is a slight leakage in the leaking tank, causing the harmful material in the medium (such as C1) to concentrate the corrosion plate and form a string of liquid.
Processing method
Replace the cracked or perforated plate and find the cracks in the panel.
Adjust the running parameters to meet the design conditions.
When the heat exchanger is repaired and assembled, the size should meet the requirement, not the smaller the better.
Reasonable matching of sheet material for plate heat exchanger.