The plate preheater is a heat exchanger that uses hot blast stove flue gas to preheat blast furnace gas and combustion air. The blast furnace gas and combustion air after heat exchange enter the hot blast stove for combustion, which can increase the combustion temperature by 120~200℃, which can save the hot blast stove fuel, increase the air supply temperature, reduce the blast furnace coke ratio, and improve the strength of iron making. The plate preheater has a high economic value, and the investment cost of the equipment is recovered in about 3 to 5 months.
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