The plate heat exchanger is a high-efficiency heat exchanger made up of a series of stainless steel metal sheets with a certain corrugated shape. Because of its performance characteristics, the plate heat exchanger can play a very important role in the heating working environment. The plate heat exchanger is very good, but its circulation cross-section is small, and it is prone to blockage after fouling, which reduces the heat exchange efficiency of the plate heat exchanger. Therefore, solving the problem of cleaning the plate heat exchanger and preventing the formation of scale will become an important issue to ensure safe production and economic operation.
During the use of the plate heat exchanger, due to improper operation of the water treatment equipment, the water quality control is not up to standard. Unqualified softened water is injected into the heating system, so that the calcium, magnesium, and carbonate in the water decompose into calcium carbonate and magnesium hydroxide after being heated, and the precipitates adhere to the heating surface of the heat exchanger, forming a hard scale. The poor thermal conductivity of scale causes low heat exchange efficiency of the heat exchanger and a serious waste of heat energy, which will eventually affect the heating effect and cause serious negative effects on the heating unit. Formic acid can effectively remove scale. Through the acid immersion test, it is found that formic acid can effectively remove the scale attached to the plates, and the corrosion effect of formic acid on the heat exchanger plates is very small.