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Correct cleaning method of plate heat exchanger
Source: Time: 2020-07-23 13:35:32 Hit:
The plate heat exchanger has a small circulation cross-section, which is prone to blockage after scaling, which reduces the heat exchange efficiency and affects the safety of the equipment and the normal heat use of users. Therefore, solving the problem of cleaning the plate heat exchanger and preventing the formation of scale has always been a problem that YOJO and customers have paid more attention to.
The hazards of plate heat exchanger fouling and clogging:
During the use of the plate heat exchanger, due to improper operation of water treatment equipment and substandard water quality control, unqualified softened water is injected into the heating system, so that the calcium, magnesium, and carbonate in the water decompose into carbonic acid after being heated. Calcium and magnesium hydroxide deposits are deposited on the heating surface of the heat exchanger, forming a hard scale. Due to the poor thermal conductivity of scale, the heat exchange efficiency of the heat exchanger is reduced and the heat energy is wasted seriously, thereby affecting the heating effect and the heating unit.
Cleaning method of plate heat exchanger fouling:
The choice of cleaning agent is pickling, which includes organic acid and inorganic acid. Organic acids mainly include oxalic acid and formic acid. The main inorganic acids are: hydrochloric acid, nitric acid, etc. According to the analysis of heat exchanger fouling and process, material and scale composition:1) The heat exchanger has a small circulation area and a complicated internal structure. If the cleaning fluid is precipitated, it is not easy to discharge.
2) The heat exchanger is made of nickel-chin alloy, and hydrochloric acid is used as the cleaning fluid, which is likely to cause strong corrosion to the plates and shorten the service life of the heat exchanger.
Through repeated experiments, it is found that choosing formic acid as the cleaning fluid to clean the plate heat exchanger has the best effect. Adding buffers and surfactants to the formic acid cleaning solution has a better cleaning effect and can reduce the corrosion of the cleaning solution to the plate.The chemical test study on scale samples shows that 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 of the plate heat exchanger, and at the same time, it has little corrosive effect on the plates.
The cleaning method of the plate heat exchanger must be selected, otherwise the cleaning effect will not be achieved, and the equipment may be damaged. As a heat exchange equipment manufacturer, YOJO has been committed to brazed plate heat exchanger brand for more than ten years, providing a variety of plate heat exchanger system solutions for heat exchange equipment.
Tag: heat exchange equipment manufacturer, brazed plate heat exchanger brand, Plate heat exchanger system
