The process system of using the waste heat of hot blast stove flue gas for blast dehumidification

Abstract

The invention relates to a process system for air-blasting dehumidification through smoke waste heat of a hot-blast stove. The process system comprises a dryer, a regenerator, two sets of conveying and lifting devices and a drying agent. A drying agent discharge opening is formed in the bottom of the dryer, an air inlet is formed in the lower portion of the dryer, a drying channel is formed in the middle portion of the dryer, and a drying agent feed opening and an air outlet are formed in the top of the dryer. A drying agent discharge opening is formed in the bottom of the regenerator, a hot-blast stove smoke inlet is formed in the lower portion of the regenerator, a drying agent regeneration channel is formed in the middle portion of the regenerator, and a drying agent feed opening and a hot-blast stove smoke outlet are formed in the top of the regenerator. The air inlet is connected to an air blower, the air outlet is connected to an inlet of the hot-blast stove, a smoke outlet of the hot-blast stove is connected to the hot-blast stove smoke inlet through a preheater, and the drying agent is circularly conveyed in the dryer and the regenerator through the two sets of conveying and lifting devices. The system indirectly dehumidifies air through the smoke waste heat of the hot-blast stove, a low-temperature environment does not need to be provided, pollution to the air cannot be caused, the energy sources are saved, and the blast furnace coke ratio is reduced.

Description

technical field [0001] The invention relates to the field of recovery of waste heat from flue gas of a hot blast stove, in particular to a process system for using the waste heat of flue gas of a hot blast stove for blast dehumidification. Background technique [0002] The hot blast stove generates high-temperature air by burning blast furnace gas and blows the high-temperature air into the blast furnace to increase the smelting strength of the blast furnace. After the blast furnace gas is burned, the temperature of the flue gas discharged from the hot blast stove is 280-350°C, and the flue gas is usually passed into the preheater Internal preheating air or double preheating of air and gas, the temperature of the flue gas discharged from the preheater drops to about 150°C, and it is usually discharged directly without being used. [0003] In the blast furnace, the increase of humidity will increase the coke ratio of the blast furnace, and the water vapor will chemically reac...

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Problems solved by technology

[0003] In the blast furnace, the increase of humidity will increase the coke ratio of the blast furnace. The water vapor will chemically react with coke at high temperature to consume charcoal. The combustion temperature thus increases the energy consumption of the blast furnace. Therefore, the blast furnace generally needs blast dehumidification. The current blast dehumidification includes two kinds of adsorption method and freezing method. The air is fully contacted to absorb the moisture in the air, and then the adsorbent is heated and dehydrated to regenerate and recycled in this way. The freezing method is to cool the humid air through a refrigerator to reduce its temperature to the corresponding air pressure and moisture content. Below the saturation temperature, the water in the humid air will be condensed and precipitated. These two methods are more energy-intensive, and both need to create a low-temperature environment

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