Precautions for plate heat exchanger cleaning agents

Precautions for plate heat exchanger cleaning agents

During the use of plate heat exchanger cleaning agents, the following precautions should be taken:

1. Chemical cleaning aspect

• Cleaning agent selectionDifferent types of dirt should be cleaned with corresponding chemical cleaning agents, and cleaning solutions that corrode heat exchangers should not be usedFor example, for common scale, acidic cleaning agents such as hydrochloric acid, sulfuric acid, etc. can be used for cleaning; For oil stains, alkaline cleaning agents or surfactants can be used. At the same time, it is necessary to ensure that the cleaning agent is compatible with the material of the plate heat exchanger to avoid damage to the plates and sealing gaskets.

• Cleaning fluid flow rateWhen cleaning, it is necessary to maintain a certain flow rate of the cleaning solution and increase the turbulence intensity of the cleaning solution to improve the cleaning effectIf the flow rate is too slow, the cleaning solution may not be able to fully contact the dirt, resulting in poor cleaning.

• Cleaning concentrationStrictly follow the instructions for using the cleaning agent to control the concentration of the cleaning solution. Excessive concentration may cause corrosion to equipment, while low concentration may affect cleaning effectiveness. Generally speaking, the concentration of cleaning solution is more suitable within the range of 0.1-0.15mol/L.

• cleaning timePay attention to the control of cleaning time. If the time is too short, the expected cleaning effect may not be achieved, and if the time is too long, it may cause unnecessary damage to the equipment. The specific cleaning time should be determined comprehensively based on factors such as scaling, type and concentration of cleaning agents.

• cyclic cleaningWhen performing chemical cleaning without disassembly, a circulation pump can be used to circulate the cleaning solution inside the heat exchanger, combined with immersion method to ensure that the cleaning solution can fully cover all heat exchange surfaces.

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2. In terms of physical cleaning

• Brush selectionIf using a brush for manual washing, a soft brush should be chosen and hard tools such as carbon steel brushes should be avoided to avoid scratching the surface of the plate or heat exchange tube, which may affect the heat exchange effect.

• Strength controlDuring the cleaning process, it is important to control the intensity of brushing to avoid damaging the equipment due to excessive force. Especially for some sheets made by pressing thin metal plates, attention should be paid to controlling the strength.

3. other aspects

• safety protectionDuring the cleaning process, operators should take safety precautions, such as wearing rubber gloves, goggles, etc., to avoid contact with harmful chemicals or hot water systems.

• Equipment inspectionBefore cleaning, it is necessary to inspect the plate heat exchanger to understand its scaling situation, whether there are leaks, and other issues, in order to choose the appropriate cleaning method and take corresponding measures. After cleaning, the equipment should also be inspected to ensure that the boards, gaskets, and other components are intact and installed correctly.

• Environmental protectionThe wastewater generated during the cleaning process should be properly treated to avoid polluting the environment. Wastewater containing chemicals should not be discharged arbitrarily and should be collected and treated in accordance with relevant regulations.

Precautions for plate heat exchanger cleaning agentsIn summary, the use of plate heat exchanger cleaning agents requires the selection of appropriate cleaning methods and precautions based on specific circumstances, in order to ensure cleaning effectiveness while extending the service life of the equipment and ensuring normal production.