Online judgment and calculation method for air permeability of sinter bed

Abstract

The invention discloses an online judgment and calculation method for the air permeability of a sinter bed, which comprises the following steps of: based on tracking the flow of gas in an ignition furnace of a sintering machine, including the use amount of ignition gas and combustion air, and the air leakage amount at the gap of the ignition furnace, calculating to obtain the air volume of a sintered material layer below the ignition furnace, and then calculating the air permeability index of the sintered material layer by using a Views VOICE algorithm formula and then calculating the air permeability index of the sintered material layer by using a Views VOICE algorithm formula and through multiple groups of air permeability data obtained through off-line actual detection, effectively correcting the result of the method . By adopting the technical scheme, the air volume of the material layer can be clearly calculated, the problem of inaccurate air volume measurement is eliminated, and meanwhile, effective correction is carried out according to actually measured data, so that the final result for reflecting the air permeability index of the sintering material layer is simpler and more reliable and can be used for guiding subsequent sintering production adjustment and control; and the stability of sintering production is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical sintering equipment and production process control, and in particular relates to an online judgment and calculation method for the air permeability of a sintered material layer. Background technique [0002] Gas when iron ore powder is sintered. The propagation law of the gas in the material layer and the change of the fluctuation state affect the process of mass transfer, heat transfer and physical and chemical reactions in the sintering process. The air permeability state of the material layer is very important to the forward progress of the sintering process, as well as the impact on the output, quality and energy consumption indicators of the sintered ore. Therefore, realizing the online judgment of the gas permeability state of the sintered material layer has more significant practical guiding significance for sintering production. [0003] The typical evaluation methods for the air p...

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Problems solved by technology

[0003] The typical evaluation methods for the air permeability of the sintered raw material layer are: Ramsin formula, Carman formula, Ergun formula and Voice formula, among which Ramsin formula and Carman formula are suitable for theoretical analysis but not for actual production; Ergun formula is difficult to measure online due to its complex parameters; The Voice formula has the advantages of simple calculation and strong experience. Due to the problem of inaccurate air volume measurement, it is limited in practical applications.

[0004] Jiang Bo et al. from Central South University applied the method of fuzzy mathematics to comprehensively evaluate the air permeability of the sintering process by using raw material parameters, operating parameters and state parameters, and predicted the change trend of the process air permeability. This method considered almost all Factors related to air permeability, but there is also the problem that some parameters cannot be continuously detected in field application, and the formulation of the weight of each parameter is very empirical, which limits its popularization and application

This method can only explain the granulation performance of a single ore, and is less effective in predicting the air permeability of a blended ore

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