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How to improve the heating quality of plate heat exchanger
Aug 03, 2018

At present, thermal energy is widely used and widely used in the production of industrial enterprises. The advantages and disadvantages of heat transfer have become one of the core issues of plate heat exchangers. For a single-flow combined plate heat exchanger, it is difficult to improve the heating quality by simply increasing the area additional coefficient in the normal flow rate range.

When the primary side pressure drop is also taken at 30 kPa, neither of them meets the design requirements. If the pressure drop is reduced to 10 kPa, the BRW50 type can meet the secondary side heat medium outlet temperature required by the design. Of course, this is at the cost of doubling the heat exchange area. When the design specification stipulates the influence of fouling, the area addition factor is up to 67%.

Under the standard temperature conditions and the normal flow rate range, the existing plate heat exchanger can generally guarantee the heating quality required by the design in the early stage of its continuous use period. In the later stage of its continuous use period, it cannot be affected by the dirt. Provide secondary heat medium required in the design.

By reducing the board spacing and appropriately increasing the aspect ratio of the existing plate heat exchanger plates, the heating quality of the plate heat exchanger can be improved, and the heating quality during the scale operation of the plate heat exchanger can be improved. Easy to implement.

In the calculation of the plate heat exchanger, the theoretical heat exchange area F0 primary side heat medium flow rate is 0.4m / s to determine, if the selected area is not considered additional, then in the continuous use of the plate heat exchanger In the early stage, the heating quality can meet the design requirements, and the secondary secondary water temperature can not be reached in the later stage. However, if the heat exchange area is increased by 15%, the heating quality required for the design can be ensured even in the later stage of continuous use of the plate heat exchanger.

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