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Purpose and method of increasing heat transfer temperature difference in stainless steel heat exchanger
Jun 03, 2019

One of the commonly used measures to enhance the heat transfer effect of stainless steel heat exchangers is to increase the heat transfer temperature difference of the heat exchanger. There are two commonly used methods: one is to change the average heat transfer temperature difference by using different heat exchange surfaces when the inlet and outlet temperatures of the hot fluid and the cold fluid are constant. purpose. The second is to expand the difference between the temperature of the inlet and outlet of cold and hot fluids to average the heat transfer temperature difference.


This method is affected by the conditions of the actual equipment or process, so it should be considered as the main means to enhance the heat transfer effect of the heat exchanger. For example, the temperature of the circulating water cooler cooling water is affected by local temperature and humidity, etc. It is difficult to cool down, and on the other hand, the energy consumption is greatly increased. Therefore, the actual situation of the thermal system energy should be considered comprehensively, and this method should be used reasonably, and the heat transfer temperature difference cannot be increased blindly.


The safe operation of the stainless steel heat exchanger is slow first, and it must be fully preheated and gradually warmed up; the preheating of the pressure reducing valve and the adjustment after commissioning should be done; the cold side valve should be opened first when the unit starts. After the stabilization, the hot side valve is opened; when stopping, the hot side valve is closed first, then the cold side valve is closed.


After the stainless steel heat exchanger is in normal operation, the steam-water heat exchanger steam trap bypass valve (not shown in the schematic diagram) is closed, and the steam trap is put into normal operation. If the temperature of the steam trap is too low, such as below 50 °C, the bypass valve can be opened. If the temperature of the steam trap is too high, such as above 90 °C and the condensate system is running without pressure, the bypass valve is closed to prevent steam from passing through; Consistent with similar heat exchangers, this makes operation smoother and more efficient.

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