Introduction
For a long time, the electric arc furnace has been widely used in the steelmaking industry to produce molten iron with higher efficiency and lower energy consumption. Although the electric arc furnace is an important equipment for smelting, there are still many shortcomings in the current smelting process, such as the large amount of slag generated by the smelting process and the low tuyere efficiency. Therefore, in order to improve the quality of molten iron and reduce the energy consumption, how to improve the tuyere efficiency and smelting efficiency is essentially the focus of current research.
Given this, the use of oxygen lance to increase the thermal delivery efficiency of electric arc furnace is studied in this paper. The specific research content is as follows: First, the multi-function of the oxygen lance is briefly introduced, and then the study of the oxygen lance cluster in the electric arc furnace is described in detail, mainly including the research of oxygen supply mode and the study of energy-saving effect of oxygen lance cluster oxygen supply. Finally, the working principle of oxygen lance cluster oxygen supply is described in detail, and the results are analyzed.
Oxygen lance workshop
The introduction of oxygen lance technology into the electric arc furnace has great advantages, especially when it is used together with the tuyere cluster set, not only can the thermal supply efficiency of electric arc furnace be improved, but also the smelting cost can be greatly reduced. This is mainly because the oxygen lance has the following three functions:
1. Enhance the combustion speed of electric arc furnace
Using oxygen lance to directly supply oxygen to electric arc furnace, this will greatly reduce the preheating time of lances and furnace furnace, thus enhancing the combustion speed of tuyere, and thus the thermal supply efficiency of the electric arc furnace is improved.
2. Reduce electric arc furnace loss
On the one hand, the oxygen lance can inject oxygen into electric arc furnace, which can combust a large amount of molten iron, thus greatly reducing the iron loss of electric arc furnace; On the other hand, the oxygen lance can spray iron-melting slag, which has the effect of reducing electric arc furnace slag.
3. Enhance the catalytic properties of electric arc furnace
Adding oxygen lance to electric arc furnace has the effect of improving furnace gas environment and slagging heat absorption effect. The catalytic properties of electric arc furnace are thus improved, and the daily output of molten iron is effectively improved.
Oxygen lance cluster
With the deepening of the research on electric arc furnace and the improvement of lance smelting technique, its application range can be extended from steel-smelting area to non-ferrous alloy smelting area and chemical industry smelting area. At present, many enterprises begin to apply the lance cluster set into the electric arc furnace, so as to realize the multi-point oxygen injection and make full use of the benefits of oxygen lance on electric arc furnace.
The research and application of oxygen lance cluster mainly include two aspects: oxygen supply mode and energy saving effect.
1. Oxygen supply mode
Generally, the oxygen lance cluster set used in electric arc furnace is composed of five or six lances, which can be divided into single point oxygen supply and multi-point oxygen supply. The difference is that when using single point oxygen supply, the oxygen lance is placed in the center of the electric arc furnace and the oxygen is inputted through the lances in the single point; When the multi-point oxygen supply is used, the oxygen lance is arranged in several points of the electric arc furnace, and the oxygen is simultaneously inputted in several points in the electric arc furnace.
From the perspective of thermal supply effect, the oxygen lance cluster set has the advantages of short preheating time and fast oxygen input, thus greatly improving the efficiency of thermal delivery and further improving the energy utilization rate of electric arc furnace. At the same time, the effect of increasing temperature can be used to reduce the melting time of molten iron, effectively reduce energy consumption and improve the smelting efficiency of electric arc furnace.
2. Energy-saving effect
On the one hand, the oxygen lance cluster set can reduce the preheating time of electric arc furnace, thus effectively reducing the smelting energy consumption; On the other hand, due to its multiple-point oxygen input, oxygen flow is more uniform, which can reduce the loss of molten iron and smelting slag, and save energy consumption.
At the same time, due to the combination of tuyere and oxygen lance, the hydrogen and nitrogen content in electric arc furnace can be greatly reduced, and through the center-leaning oxygen supply mode, the heat loss of electric arc furnace can be further reduced, thus effectively improving the energy utilization rate and reducing energy consumption.
2. Working principle
The oxygen lance cluster oxygen supply installed in the electric arc furnace consists of five or six lances, of which three or four are the main oxygen supply lances, and the other one or two are the adjustment lances. The oxygen and control signal sent to each lance are independently isolated to ensure the normal oxygen supply of the lance and avoid the interference of the working environment.
The main oxygen lances of the oxygen lance cluster supply oxygen to the center part of the electric arc furnace under the control of the computer-controlled valve, whereas the adjustment lances are set on the both sides of the main lances. The oxygen supply of the adjustment lance is adjusted by adjusting the oxygen supply valve, so that the oxygen flow of each lance is the same, thus making the oxygen supply of the electric arc furnace more uniform.
Conclusion
In summary, the use of oxygen lance cluster oxygen supply in electric arc furnace has the advantages of short preheating time and fast oxygen input, which can greatly reduce the energy consumption of electric arc furnace, improve the thermal delivery efficiency, reduce slag generation and improve the quality of molten iron. Therefore, combined with the comprehensive application of multi-function oxygen lances and tuyere cluster sets, the melting efficiency and energy consumption of electric arc furnace can be further optimized.
