Working principle of the pre-corrosion reactor
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In the design of the transformation section, there is a equipment pre-corrosion unit. What is its working principle? I would appreciate guidance from experts
The main function of the pre-corrosion device is to protect the heat exchanger and prevent it from corroding. The main causes of corrosion in heat exchangers are dew point corrosion and cavitation erosion. Due to the low amount of make-up steam in the all-low-temperature variation process, it is not possible to address heat exchanger corrosion using the conventional method of adding superheated steam; instead, a stainless steel pre-corrosion device is required. Meanwhile, to enable it to operate at lower hydrogen sulfide concentrations, steam is not added at the heat exchanger inlet but rather between the second and third sections of the shift converter; this reduces the dew point of the semi-water gas entering the heat exchanger, thereby minimizing dew point corrosion. Heat exchangers can also adopt jacketed, center-tube, floating-head, and counter-current mixing types to enhance their corrosion resistance.