A monitoring method for blast furnace hearth erosion deviation

Abstract

The invention discloses a method for monitoring erosion deviation of a blast furnace hearth, relates to online monitoring of erosion of an iron and steel smelting blast-furnace lining, and particularly relates to a method for monitoring erosion deviation of the blast furnace hearth by using computer program. The method comprises the following steps: building a blast furnace model; dividing a computational domain of the hearth bottom according to the material and the shape of the furnace wall; obtaining the temperature of sensors on the furnace wall and a cooling wall; calculating an erosion model at the hearth bottom, and determining the computation temperature of a temperature measuring point of the furnace body; calculating the temperature of a boundary node of the furnace body; carrying out hearth erosion convergence condition judgment by using the really measured temperature of the furnace wall and the cooling wall; carrying out hearth erosion analysis and monitoring alarming by using the computation result. The furnace body temperature sensor and the cooling wall body temperature sensor are comprehensively utilized to monitor the deviation, and the problems of a computation failure easily caused by the damage to the furnace wall temperature sensor, and a large error in the computation result caused by erosion computation by directly utilizing the cooling wall temperature sensor in the existing erosion monitoring computation method can be solved.

Description

technical field [0001] The invention relates to on-line monitoring of lining erosion of iron and steel smelting blast furnaces, in particular to a method for monitoring erosion deviation of blast furnace hearths by using computer programs. Background technique [0002] During the blast furnace production operation, the blast furnace hearth area plays a decisive role in the blast furnace life. In the blast furnace production process, the hearth area of ​​the blast furnace is always in the process of continuous erosion and solidification. Secondly, in order to pursue high production and low cost, the erosion of the hearth is often aggravated. With the development of erosion, the thickness of the side wall of the hearth will continue to become thinner. When the thickness of the side wall reaches the limit, the blast furnace will be shut down for overhaul, which also means the end of the lifetime of the blast furnace. If the erosion monitoring is inaccurate and corresponding cou...

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Problems solved by technology

[0016] (1) Because this kind of problem is an ill-conditioned problem, the uniqueness of the solution, especially the stability, is usually not guaranteed, and the small error of the measurement data usually leads to a huge distortion of the solution

[0017] (2) The existing calculation methods all use the furnace wall thermocouples as the calculation parameters of the convergence condition F2, and some thermocouples have already participated in the calculation of the model F1, which will make the number of side walls involved in the calculation of the convergence condition F2 less, reflecting In terms of layout, the galvanic couple is relatively sparse, which increases the inaccuracy of calculation

[0018] (3) At the elephant foot of the hearth, the heat intensity gradient is large, and the galvanic couple laying has certain limitations. The accuracy condition F2 is not only often difficult to achieve by only relying on the comparison of the galvanic couple temperature and the calculated temperature on the side fireplace wall, even if the condition is met. Due to the non-uniqueness of the solution, the error of key parts may be large

Although this invention uses stave thermocouples for erosion calculations, the invention directly uses stave thermocouples to calculate the one-dimensional Fourier heat conduction equation for erosion calculations, resulting in large errors

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