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Precautions for plate heat exchangers in medium and small blast furnace applications
Feb 21, 2019

Based on the plate heat exchanger characterized by small and medium-sized blast furnaces, the furnace cooling water softening system uses an appropriate number of plate heat exchangers, and the three units are connected in parallel. The maximum flow rate per flow is 5 o %, and the two units are in normal operation. According to the existing experience of soft water supply of blast furnace and water supply temperature between 35~40°, the demineralization temperature in the heat exchanger is obtained.


The best blast furnace is stable, high-yield, safe production, taking into account the cooling and cooling capacity of the cooling tower water in summer, softening water into the summer blast furnace temperature is less than 40 °C under the most unfavorable conditions, the softener blast furnace temperature should be less than 45 °C appropriate temperature, That is, the softened water enters the heat exchanger at 45 ° C, and the heat exchanger is at a suitable temperature of 40 ° C.


Due to the large flow and small temperature difference of the small and medium-sized blast furnace body cooling soft water system, the structural characteristics of the plate heat exchanger are short and fat, that is, wide and high. This structure ensures good heat transfer and minimal pressure loss. The flow of the plate heat exchanger depends on the reasonable flow rate of the water in the cooling wall. Considering the thinning of the heat-resistant layer of the blast furnace lining, the heat transfer condition increases sharply, and the softened water flow is determined according to the heat transfer heat in the later stage.


The plate heat exchanger material is mainly made of stainless steel and titanium alloy. Due to the high price of titanium material, the plate heat exchanger plate material can meet the requirements by using the stainless steel blast furnace cooling system. The stainless steel plate heat exchanger plate is used for this purpose. The plate heat exchanger gasket material is designed according to the actual situation of the site and the working temperature of the plate heat exchanger and the softening water composition. The gasket material should be made of EPDM

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