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How to descale the plate heat exchanger? What problems should be paid attention to during use?

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How to descale the plate heat exchanger?  What problems should be paid attention to during use?
Click number:- Release time:2020-12-07
With the development of industry, plate heat exchangers have gradually become popularized and generalized with their own advantages, especially in terms of water-to-water heat exchange. As the heat exchanger works, after a long period of time, it will often cause scale deposition. 
As a result, the heat exchange efficiency is reduced, so we need to disassemble and descaling the plates. 
So how to descale the plates?

The first is to disassemble the heat exchanger first. The heat exchanger can be disassembled in a stable and open place according to the site conditions. The tightening size of the heat exchanger needs to be measured with a tape before the disassembly, and recorded for backup. 
Use a wrench to loosen the heat exchanger screws according to the diagonal principle, and then remove the tightening screws, and then push the movable compression plate to the side of the column, lift the plate from the back, and tilt the plate back and forth to take out the plate.

plate heat exchanger

Keeping the plates clean is one of the important conditions for maintaining the efficient heat transfer coefficient of the plate heat exchanger. The medium between the plates moves along the narrow and tortuous passages. Even if the scale is not too thick, it is enough to cause the larger 
The change significantly affects the flow of the fluid, causing the pressure drop to increase and the heat transfer coefficient to decrease. Generally speaking, chemical cleaning or physical cleaning is mainly used for scale removal, that is, for general scale layers, chemical cleaning is sufficient, but for 
For thicker scales, the plates need to be chemically softened first, and after softening, the scales should be removed mechanically (physically) to ensure the clean surface of the plates.

After cleaning, the heat exchanger needs to be restored and installed. In the process of plate installation, ensure that the plate installation position is correct, the plate size and angle distribution is correct, and the plate angle direction is correct. It is best to remove it 
Record these characteristics from time to time, otherwise it will cause the heat exchanger to leak or decrease the heat exchange capacity after installation.

After the plates are arranged, the heat exchanger needs to be tightened. The tightening method uses a screw to tighten, and the tightening is required to be even, and the tightening size of the plates is restored to the tightening size before disassembly. 
Loose, too tight will cause deformation of the plate, too loose will cause leakage of the heat exchanger
After the heat exchanger is assembled, a pressure test is required. If there is no problem with the pressure test and pressure maintaining, it can be determined that the heat exchanger is installed correctly and can be used normally. 
The general test pressure is 1.3 times the design pressure.

The assembly of the heat exchanger is an important step in the descaling process. If there is a defect in the second step, it needs to be disassembled and assembled again, which is time-consuming and laborious.

Qingdao Ripter specializes in the production and design of heat exchangers. Naturally, it is no longer necessary to clean up and descaling heat exchangers, and the production of heat exchangers is customized to meet your various requirements.

【Paper label】:plate heat exchanger

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