What are the common causes of fouling in a heat exchanger

What are the common causes of fouling in a heat exchanger?

  The plate heat exchanger works for a long time, the surface of the heat transfer plate will produce different degrees of dirt or deposits, thereby increasing the flow resistance and reducing the heat transfer performance. These are mainly the pressure difference between the inlet and outlet pressure gauges and reduce the temperature of the cold medium outlet. so we have to clean it, what is the cause of blockage and fouling of the plate heat exchanger?

(1)Blocked

Particles larger than 1.5~3mm in diameter tend to block the channel of the plate, and the flow passage gap of the plate heat exchanger is small, which causes the heat exchange capacity of the equipment to be greatly reduced due to clogging, which seriously causes continuous production interruption of the device. Therefore, a coarse filter or a backwashing device can be provided at the inlet of the medium as needed to effectively prevent clogging of the plate heat exchanger.

(2)Scaling

In severe cases, the plate passage is blocked. The plate heat exchanger plate is designed with a large number of support points. The scaling can cause the heat transfer coefficient of the heat transfer device to decrease, aiming to disturb the medium (to make the medium turbulent to improve heat transfer coefficient) and pressure bearing, where solid debris is easy to accumulate, the side effect is that the fluid forms a local stagnation to generate dirt, and the calcium and magnesium ions in the medium are easily formed into a honeycomb scale after being precipitated at a suitable temperature.