Blast rotary-wheel dehumidification device for blast furnace

Abstract

The invention relates to a blast rotary-wheel dehumidification device for a blast furnace. The device mainly comprises a rotary-wheel dehumidifier which is provided with a rotary-wheel dehumidification area and a rotary-wheel regeneration area and can perform circulating dehumidification and then perform regeneration, wherein two sides of the rotary-wheel dehumidification area are provided with an inlet air duct and an outlet air duct respectively, and two sides of the rotary-wheel regeneration area are provided with a regenerated-air inlet air duct and a regenerated-air outlet air duct respectively; an inlet valve is arranged on the inlet air duct; and the outlet air duct is connected with a blower. The device is characterized in that: a heater, a ventilator and a regenerated-air air valve are sequentially arranged on a pipeline of the regenerated-air inlet air duct; and a heater steam supply pipe and a heater condensing drain pipe are communicated with the heater respectively. After the air is dehumidified by using the device, the temperature of the air can be raised to a certain degree, so that the process of the dehumidification of a surface cooler, namely the process that the air is required to be super-cooled and then heated is avoided, and the reheating energy consumption is reduced. The device is high in efficiency and compact, takes steam as a heat source, and fully utilizes steam resources of metallurgic plants.

Description

Technical field [0001] The invention relates to a device for dehumidification of a blast furnace ironmaking blast wheel. Background technique [0002] The ironmaking process is an important part of energy saving in my country's iron and steel industry. The ratio of coke into the furnace of key steel enterprises is less than 390kg / tFe, but some small and medium-sized steel enterprises have a higher ratio of coke into the furnace, some even reach 488kg / tFe, and the fuel ratio is 560kg / tFe. about. [0003] Blast furnace blast dehumidification is an important measure for blast furnace energy saving and consumption reduction. Through blast dehumidification, the output of blast furnace can be increased, the coal injection ratio and the coke ratio can be reduced. When the moisture content of the blast furnace blast decreases by 1g / m3, the comprehensive coke ratio decreases by 0.7kg / tFe, equivalent to 0.68kgce / tFe; for every 1g / m3 decrease in the moisture content of the blast furnace blast...

AI Technical Summary

Problems solved by technology

The surface cooling and freezing dehumidification method is that after the air is supercooled and dehumidified by the surface cooler, it is heated in the hot blast stove and then sent to the blast furnace, which causes energy waste and high operating costs.

Lithium bromide refrigeration units need to be equipped with cooling water pumps, cooling water pumps, cooling towers and other equipment, design complex cooling water and cooling water system pipelines, and arrange special refrigeration stations, so the floor space becomes larger and investment costs increase

The lithium bromide refrigeration unit is mainly composed of generators, absorbers, evaporators, condensers, solvent pumps, and solution pumps. There are many moving parts, which will generate large noise during operation, which is not conducive to the working environment of workers.

[0005] In addition, the freezing dehumidification method is suitable for occasions where the air dew point temperature is higher than 4°C, and it is not suitable for low-temperature air below 4°C.

At the same time, it is necessary to drain water after freezing and dewatering, and to demist the dehumidified air. If the drainage is not timely, it will affect the safe operation of the fan.

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