阅读说明：本技术 一种废钢破碎料代替冷却剂的炼钢操作方法 (Steelmaking operation method for replacing coolant with scrap steel broken material ) 是由 韩雨亮 孙学刚 吴军 于 2019-02-10 设计创作，主要内容包括：本发明公开了一种废钢破碎料代替冷却剂的炼钢操作方法,步骤如下：将中型废钢采用破碎的方式加工为破碎料,同时要求破碎料堆比重＞1.60t/m<Sup>3</Sup>,通过运输至转炉高位料仓；通过废钢熔化计算1kg破碎料熔化所需要的热量,根据炉内热量富裕量确定破碎料加入量：Q废钢=m废钢×{C固·(t熔-t初始)+废钢的熔化潜热+C液·(t出-t熔)}；1kg废钢在出钢温度为1670℃时的冷却效应是：Q废钢=1441.97kJ/kg,每一炉铁水成分及温度输入热量平衡计算模型,采用高位料仓加入破碎料来平衡炉内多余的热量。(The invention discloses a steelmaking operation method for replacing a coolant by a scrap steel broken material, which comprises the following steps: the medium-sized scrap steel is processed into crushed material in a crushing mode, and the bulk specific gravity of the crushed material is required to be more than 1.60t/m 3 The method comprises the steps of conveying the waste steel to a converter high-level bin, calculating the heat required by melting 1kg of broken materials through melting of the waste steel, and determining the adding amount of the broken materials according to the heat surplus in the converter, wherein Q waste steel = m waste steel × { C solid. (t melt-t initial) + latent heat of melting of the waste steel + C liquid. (t out-t melt) }, and the cooling effect of the 1kg of waste steel at the tapping temperature of 1670 ℃ is that Q waste steel =1441.97kJ/kg, a heat balance calculation model is input for the molten iron component and the temperature of each converter, and the broken materials are added to the high-level bin to balance the redundant heat in the converter.)

1. A steel-making operation method for replacing a coolant by a scrap steel crushing material is characterized by comprising the following steps: the medium-sized scrap steel is processed into crushed material in a crushing mode, and the bulk specific gravity of the crushed material is required to be more than 1.60t/m³The method comprises the steps of conveying the waste steel to a converter high-level bin, calculating the heat required by melting 1kg of crushed material through melting of the waste steel, determining the adding amount of the crushed material according to the heat allowance in the converter, wherein Q waste steel = m waste steel × { C solid. (t melting-t initial) + latent heat of melting of the waste steel + C liquid. (t out-t melting) }, and the cooling effect of the 1kg of waste steel at the tapping temperature of 1670 ℃ is that Q waste steel =1441.97kJ/kg, and a heat balance calculation model is input into each converter molten iron component and temperature, and is adoptedThe high-level stock bin is added with the crushed materials to balance the redundant heat in the furnace.

Technical Field

The invention relates to a steelmaking operation method for replacing a coolant by a scrap steel broken material.

Background

In recent years, the price of iron concentrate powder, pellet ore and other resources is high, and the steel bar enterprises which do not reach the standard are gradually banned along with the increase of the environmental protection inspection force of the beginning of China. At present, the actual conditions of stopping production of a large number of intermediate frequency furnaces and small electric furnaces are formed, and the condition that the supply of the scrap steel is not in demand on the market is changed at once. The utilization of scrap steel resources to reduce iron consumption and increase steel yield becomes an important measure for reducing the overall production cost of iron and steel enterprises. At the present stage, iron consumption reduction work of iron and steel enterprises mainly adopts modes of improving the volume of a scrap steel hopper, increasing the heating volume of coke and the like, and scrap steel is added into a furnace for smelting at one time. Under the condition, when the hot metal has heat surplus, the heat balance in the furnace is balanced by adopting cooling agents such as pellets and slag, and accidents such as splashing caused by overhigh temperature in the furnace are prevented. The adoption of the coolant for balancing the heat in the furnace not only increases the production cost, but also increases the slag amount in the furnace and further increases the consumption of iron and steel materials.

Disclosure of Invention

The invention aims to provide a steelmaking operation method for replacing a coolant by scrap steel broken materials, which selects a resource with high cost performance to replace a slag charge coolant in a smelting process according to problems in field actual production, and can not only achieve the effect of balancing redundant heat in a furnace, but also achieve the production and operation targets of improving average furnace yield and reducing unit consumption of molten iron.

The invention aims to realize the steel-making operation method of replacing the coolant by the scrap steel broken material, which comprises the following steps: the medium-sized scrap steel is processed into crushed material in a crushing mode, and the bulk specific gravity of the crushed material is required to be more than 1.60t/m³The method comprises the steps of conveying the waste steel to a converter high-level bin, calculating the heat required by melting 1kg of broken materials through melting of the waste steel, and determining the adding amount of the broken materials according to the heat surplus in the converter, wherein Q waste steel = m waste steel × { C solid. (t melt-t initial) + latent heat of melting of the waste steel + C liquid. (t out-t melt) }, and the cooling effect of the 1kg of waste steel at the tapping temperature of 1670 ℃ is that Q waste steel =1441.97kJ/kg, a heat balance calculation model is input for the molten iron component and the temperature of each converter, and the broken materials are added to the high-level bin to balance the redundant heat in the converter.

Specific data for the process of the invention are shown in table 1 below:

TABLE 1 converter heat balance calculation output table

The main improvement effect is as follows:

1. the method has the advantages that the broken scrap steel materials are adopted to replace the cooling agent used in the smelting process, the shortage of resources such as pellet ore and the like is relieved, the production cost is increased due to the fact that the price is high in the market, meanwhile, the molten iron consumption is reduced by utilizing the condition that the scrap steel resources are sufficient in the market, and the yield of qualified billets is improved.

2. The scrap steel broken materials are adopted to replace a cooling agent used in the smelting process, so that the metal loss caused by the increase of slag in the smelting process is reduced, and the control of the steel material index is facilitated.

3. The scrap steel broken materials are adopted to replace a cooling agent used in the smelting process, and the stability of physical melting of the broken materials is utilized, so that the chemical reaction generated by adding slag materials such as pellets, dolomite and the like in the smelting process is reduced, the frequency of manual intervention of oxygen lance operation in the smelting process is reduced, and the operability and the stability of one-key steel making are facilitated.

Detailed Description

A steel-making operation method for replacing a coolant by a scrap steel crushing material comprises the following steps: processing the medium-sized scrap steel into a crushed material in a crushing mode, and conveying the crushed material to a converter high-level bin when the bulk specific gravity of the crushed material is more than 1.60t/m 3; calculating the heat required by melting 1kg of crushed materials through scrap steel melting, and determining the addition amount of the crushed materials according to the heat allowance in the furnace: q scrap = m scrap x { C solid. (t melt-ttinity) + latent heat of fusion of scrap + C liquid. (t out-t melt) }; the cooling effect of 1kg of steel scrap at a tapping temperature of 1670 ℃ is: q scrap steel =1441.97kJ/kg, the hot metal component and temperature of each furnace are input into a heat balance calculation model, and the excessive heat in the furnace is balanced by adding crushing materials into a high-level bunker.