脱湿鼓风对高炉系统能耗的影响

 高炉鼓风系统出口空气湿度对高炉冶炼过程具有重要影响。以国内某2500m3年产生铁量220万t高炉为例，采用机前冷却脱湿法，以蒸气作为热源的吸收式制冷与蒸气压缩式制冷系统串联作为脱湿冷源建立数学模型，动态计算了上海地区不同湿度参数条件下高炉冶炼过程的能耗情况。结果表明，随着出风湿度的降低，高炉冶炼过程的节能量增加，制冷系统的能耗也增加。目标湿度降低0.1g/m3，节约能量0.01~0.07kg/t，双效吸收式系统能源消耗0.01~0.03kg/t，单效吸收式系统能源消耗0.02~0.05kg/t，蒸气压缩式制冷系统能源消耗0.01~0.04kg/t。若仅采用双效吸收式制冷系统，出风湿度宜为8g/m3；若仅采用单效吸收式制冷系统，出风湿度宜为9.5g/m3；利用蒸气压缩式制冷深度脱湿的出风湿度宜为6g/m3。

Effect of Blast Dehumidification on Energy Consumption of Blast Furnace System

The blast dehumidification system outlet air humidity has very important influence on the blast furnace smelting process. Taking a certain domestic 2500m3 blast furnace, annual output pig iron 2.2 million tons for example, the cooling dehumidifying ways was used before the blowing, at the same time combines absorption refrigeration system which used vapor as its thermal source with vapor compression refrigeration system that was used as cool source in the dehumidification system, and a mathematical model was established to calculate the energy savings in the blast furnace smelting process under the condition of different humidity parameters in the Shanghai region dynamically. The results show that when the outlet air humidity declines, the energy-saving of the blast furnace increases, as well as the energy consumption of the refrigerating system. When the humidity reduces 0.1g/m3, the energy saves 0.01-0.07kg/t, the energy consumption of the double-effect refrigerating system is 0.01-0.03kg/t, the energy consumption of the single-efficient refrigerating system is 0.02-0.05kg/t, the energy consumption of vapor compression refrigeration system is 0.01-0.04kg/t. If the double-effect refrigerating system is just adopted, the outlet wind humidity should be 8g/m3. However if the single-efficient refrigerating system is just adopted, the outlet wind humidity should be 9.5g/m3, if vapor compression refrigeration is adopted to deep dehumidify, the outlet wind humidity should be 6g/m3.