13. The Feasibility Study on Blast Furnace Low Temperature Heat Source Refrigeration for Dehumidified Blast

Global climate change has become the focus of national attention and iron and steel enterprises, which have the feature of high energy consumption and high emissions, have an extremely significant influence on global climate change in Chinese modern industrialization process. The technology of blast furnace low-temperature heat source refrigeration for cooling dehumidifying uses huge amount of waste heat during blast furnace iron making process as the driving force of absorption refrigerator, and then the cooling capacity of preparation is used to reduce the moisture in blast furnace blowing to make the air humidity reduce to optimum value required for the operation, so as to save coke and increase the output. This article takes a certain Chinese large-scale blast furnace as an example, and has determined the technological process of using hot blast stove gas as a driving heat of absorption refrigerator to dehumidify blast furnace. We have determined the optimal outlet air humidity range by establishing system energy consumption model in different blast humidity. We select a certain iron and steel enterprise’s 450 m³ blast furnace and analyze the energy and economy efficiency after using dehumidifying blast system and calculate the equipment’s investment recovery period. The results show that in Liaoning Province when the blast humidity is about 8 g/m³, the system has the best energy economy efficiency and can save 3.06 kgce/t compared with the traditional technological process, and the equipment investment recovery period is 1.8 years, Reasonably use a large number of low temperature waste heat and reduced heat emissions has a significant impact on energy conservation and emissions reduction and climate change.