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15
2023
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11
Maintenance and Precautions for Heat Exchangers
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Summary:
The working principle of the heat exchanger is mainly used for air heating in drying systems. It is the main equipment in hot air devices. The heat medium used in the radiator can be steam or hot water, and heat transfer oil can also be used. The working pressure of the steam generally does not exceed 0.8 MPa, and the temperature of the hot air is below 150°C.
The working principle of the heat exchanger is mainly used for air heating in drying systems. It is the main equipment in hot air devices. The heat medium used in the radiator can be steam or hot water, and heat transfer oil can also be used. The working pressure of the steam generally does not exceed 0.8 MPa, and the temperature of the hot air is below 150°C.
Maintenance of plate heat exchangers
The easily damaged part of the plate heat exchanger is the sealing gasket, which is generally made of EPDM rubber, resistant to acid, alkali, and salt, suitable for severe corrosion situations involving chlorides and organic solvents. The working temperature is generally between -20 to 150°C. Practice has shown that the addition of a defoamer to the aMDEA solution will cause the gasket to swell. Based on current operating conditions, the service life of the gasket is about 12 years. Proper operation has a direct impact on the service life of the plate heat exchanger, so during the operation of the heat exchanger, improper operations that affect its performance, such as water hammer, should be avoided, and a suitable filter should be added at the medium inlet.
For standby equipment, if not used for a long time, the tightened bolts should be loosened to the specified size to ensure the service life of the gasket and heat exchanger plates, and should be tightened according to requirements when in use.
When the equipment is running continuously, if medium is found leaking from the signal hole, an analysis should be conducted. If it is due to loose bolts or elongation from long-term heat exchange, care should be taken when tightening, as the high heat transfer coefficient of the plate heat exchanger is mainly due to the corrugated plates that create turbulence at lower flow rates. Non-professionals are likely to cause irreversible damage when tightening. It is recommended not to tighten when the equipment is in use. If the sealing gasket is found to be aging, it should be replaced.
Chemical cleaning of plate heat exchangers is relatively reliable; mechanical cleaning should be consulted with the manufacturer. During daily maintenance and during startup and shutdown, prevent water hammer and pressure fluctuations from impacting the equipment. The medium in the plate heat exchanger should be clean and maintain the design flow rate, with a suitable filter mesh added at the medium inlet, and the filter mesh should be cleaned regularly.
Precautions
1. Keep the pipeline network clean. Whether before or after work, the pipeline network must be cleaned to avoid clogging of the heat exchanger. Also, pay attention to timely cleaning of the decontaminator and filter to ensure smooth operation.
2. Strictly control softened water. Quality control of water is very important. Before treating the quality of softened water, first carefully check the water quality in the system and the softened tank, and only proceed with injection treatment after confirming it is qualified.
3. New system inspection. For some new systems, they cannot be immediately alternated with the heat exchanger. First, the new system should run for a specified period to establish an operating mode, and only then can the heat exchanger be integrated into the system. This is entirely to avoid impurities in the pipeline network from damaging the heat exchanger equipment.
Heat exchange equipment solutions
Chongqing Southwest Saiwei Heat Exchange Equipment Co., Ltd. is committed to providing customers with excellent heat exchange equipment solutions. With the rapid development of the industrial field, the demand and application of heat exchange equipment are becoming more and more extensive. The company deeply knows that each customer's needs are unique, so customized solutions have become our core competitiveness.
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Chongqing Southwest Saiwell Heat Exchange Equipment Co., Ltd.
Specializing in the research, development, production and sales, equipment consulting, maintenance, and accessory services of heat exchange technology, equipment, and systems, and undertaking the design and installation of thermal system engineering, energy conservation and emission reduction, and energy conservation and emission reduction system engineering.
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