Method and system for estimating blast furnace efficiency

Abstract

This invention provides a method and system for predicting blast furnace efficiency. The method for predicting blast furnace efficiency includes the following steps: using a fluid dynamics model, based on a feed iron ore composition, a coke composition, a furnace belly gas flow rate, a furnace belly gas temperature, and a furnace belly gas composition, establishing a relationship between the hydrogen change rate in a furnace belly region and the temperature change in a heat retention zone; using a calculation module, calculating the temperature of the heat retention zone based on the relationship; and using a metallurgical mass-energy balance module, obtaining predicted blast furnace efficiency data based on the temperature of the heat retention zone, wherein the predicted blast furnace efficiency data includes at least one of: a coke ratio change, a gas utilization rate, a furnace top gas composition, and a furnace top gas temperature.

Claims

1. A method for predicting blast furnace efficiency, executed by a processor, the method comprising the following steps: using a fluid dynamics model, establishing a relationship between the hydrogen variation rate in a furnace belly region and the temperature variation in a heat retention zone based on a feed iron ore composition, a coke composition, a furnace belly gas flow rate, a furnace belly gas temperature, and a furnace belly gas composition; using a computational module, calculating the temperature of a heat retention zone based on the relationship; and using a metallurgical energy balance module, obtaining predicted blast furnace efficiency data based on the temperature of the heat retention zone, wherein the predicted blast furnace efficiency data includes at least one of: a coke ratio variation, a gas utilization rate, a furnace top gas composition, and a furnace top gas temperature, wherein the metallurgical energy balance module includes: a preheating zone, an upper blast furnace zone, a heat retention zone, a lower blast furnace zone, a blast tunnel zone, and a hearth zone; wherein obtaining the predicted blast furnace efficiency data comprises the following steps: plotting a reaction equilibrium line and an equilibrium point on a Riess diagram based on a Ball-Glesner diagram; Based on a chemical efficiency value and the equilibrium point, a heat retention zone operating point R is calculated on the Ries diagram; based on the feed iron ore composition, the coke composition, the furnace gas flow rate, the furnace gas temperature, and the furnace gas composition, a lower blast furnace zone operating point B is calculated; based on the heat retention zone operating point R and the lower blast furnace zone operating point B, a slope of an operating line is calculated; and based on the slope, an upper blast furnace zone operating point A is calculated.

2. The method for estimating blast furnace efficiency as described in claim 1, wherein the relationship is: , where Y is the temperature of the heat retention zone, X is the hydrogen change rate in the furnace belly zone, α1 is a constant, α2 is a constant, α3 is a constant, and α4 is a constant.

3. The method for estimating blast furnace efficiency as described in claim 2, wherein the hydrogen variation rate in the furnace belly is obtained by the following formula: .

4. The method for estimating blast furnace efficiency as described in claim 1 further comprises: using the calculation module to calculate a coke substitution rate, wherein the coke substitution rate is obtained by the following formula: .

5. A system for predicting blast furnace efficiency, comprising: a fluid dynamics model configured to establish a relationship between the hydrogen variation rate in a furnace belly region and the temperature variation in a heat retention zone based on a feed iron ore composition, a coke composition, a furnace belly gas flow rate, a furnace belly gas temperature, and a furnace belly gas composition; a calculation module configured to calculate the temperature of the heat retention zone based on the relationship; and a metallurgical energy balance module configured to obtain predicted blast furnace efficiency data based on the temperature of the heat retention zone, wherein the predicted blast furnace efficiency data includes at least one of: a coke ratio variation, a gas utilization rate, a furnace top gas composition, and a furnace top gas temperature, wherein the metallurgical energy balance module includes: a preheating zone, an upper blast furnace zone, a heat retention zone, a lower blast furnace zone, a blast radius zone, and a hearth zone; wherein obtaining the predicted blast furnace efficiency data includes the following steps: Based on a Ball-Glesner diagram, a reaction equilibrium line and an equilibrium point are plotted on a Ries diagram; based on a chemical efficiency value and the equilibrium point, a heat retention zone operating point R is calculated on the Ries diagram; based on the feed iron ore composition, the coke composition, the furnace gas flow rate, the furnace gas temperature, and the furnace gas composition, a lower blast furnace zone operating point B is calculated; based on the heat retention zone operating point R and the lower blast furnace zone operating point B, a slope of an operating line is calculated; and based on the slope, an upper blast furnace zone operating point A is calculated.

6. A system for predicting blast furnace efficiency as described in claim 5, wherein the relationship is: , where Y is the temperature of the heat retention zone, X is the hydrogen change rate in the furnace belly zone, α1 is a constant, α2 is a constant, α3 is a constant, and α4 is a constant; wherein the hydrogen change rate in the furnace belly zone is obtained by the following formula: .

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