Copper smelting anode furnace redox intelligent endpoint judgment system

Abstract

The invention discloses a copper smelting anode furnace redox intelligent endpoint judgment system, which relates to the technical field of non-ferrous metal smelting, and comprises a signal acquisition module, a wireless acquisition module and an endpoint analysis unit, DCS signals and a flue gas concentration value detected by a flue gas analyzer are collected through the signal acquisition module, the DCS signals comprise negative pressure in a hearth, natural gas flow, central oxygen flow, N2 flow and the like, the wireless acquisition module is used for acquiring a feeding ton number of anode furnace raw materials, the endpoint analysis unit comprises an endpoint judgment model, the endpoint judgment model comprises an oxidation endpoint SO2 concentration judgment model and a reduction endpoint SO2 concentration judgment model, and the concentration values of SO2 at simulated oxidation and reduction endpoints are obtained through analysis and calculation, and when the concentration values of the SO2 at the simulated oxidation and reduction endpoints are equal to the SO2 concentration value measured by the flue gas analyzer, it is judged that the oxidation and reduction endpoints are reached. The method has the beneficial effects that the oxidation and reduction endpoints can be accurately judged, and manual judgment errors are reduced.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal smelting, in particular to an intelligent redox endpoint judging system for copper smelting anode furnaces. Background technique [0002] At present, the pyro-refining of crude copper in copper smelters is carried out in the anode furnace by redox process; the redox of the anode furnace is a complex process involving chemical reaction, heat transfer, mass transfer and fluid flow. Its production has multi-variable, nonlinear, strong coupling, unsteady, large inertia and uncertainty, complex smelting mechanism, large range of material grades and many influencing factors in the process of oxidizing incoming materials, so it brings great challenges to the prediction of redox end point. big difficulty. [0003] At present, the judgment of the oxidation-reduction end point of anode furnaces at home and abroad is still based on manual judgment, such as observing flames and sampling steel braze...

AI Technical Summary

Problems solved by technology

Its production has multi-variable, nonlinear, strong coupling, unsteady, large inertia and uncertainty, complex smelting mechanism, large range of material grades and many influencing factors in the process of oxidizing incoming materials, so it brings great challenges to the prediction of redox end point. big difficulty

[0003] At present, the judgment of the oxidation-reduction end point of anode furnaces at home and abroad is still based on manual judgment, such as observing flames and sampling steel brazes, etc. This method relies on manual sampling in harsh environments to judge the redox end point, but this is also currently the case. All enterprises are widely forced to adopt this method. This method of judging by manual experience only greatly increases the work intensity of the operators, and also makes the judgment of the blowing end point rely heavily on the experience and work attitude of the operators. Occasionally, under-oxidation, over-oxidation or under-reduction due to inaccurate judgment will occur, affecting normal production, high pressure on environmental protection, low energy utilization rate, and unqualified copper quality

The method of manual experience judgment is limited by the individual operator, sampling method, sampling time, etc., resulting in deviations in judgment results, uneven product qualification rates, and failure to maximize energy utilization, which increases smelting costs

[0004] In the prior art, there is also a one-time copper water oxygen gun detection method, but based on its one-time detection, the long-term cost is high, and in actual detection, manual operations are often found to be inconsistent, resulting in inaccurate detection results Case

[0005] Chinese patent CN103667741A mentions that the concentration of SO2 and O2 in the flue gas can be analyzed by the detection unit, and the oxidation end point can be judged based on this, but the relationship between the concentration of flue gas components and the air supply volume of the DCS furnace, furnace negative pressure, The digital-analog relationship of wind pressure, flue gas temperature, natural gas flow, central oxygen flow, and compressed air flow cannot accurately determine the end point

On the one hand, this patent needs to use manual sampling to determine the oxidation and reduction endpoints to obtain the target value, and manual determination itself has errors; on the other hand, the oxidation-reduction reaction in the anode furnace will be affected by the external temperature, humidity, etc. Furnace SO 2 , when the CO content is equal to the target values ​​A and B, it is considered that there is an error in reaching the redox end point

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