System for measuring granularity of pulverized coal of blast furnace coal powder injection middle-speed milling system

Abstract

The invention discloses a system for measuring granularity of pulverized coal of a blast furnace coal powder injection middle-speed milling system. The system comprises a storage device, a sensor, a retrieve device, and a calculation correcting device, wherein the storage device is used for storing a case library, the case library comprises a plurality of cases, and each case represents a corresponding relation between the granularity of pulverized coal and an auxiliary variable influencing the granularity of the pulverized coal; the sensor is used for detecting a current production working condition in a blast furnace middle-speed milling production process; the retrieve device is used for retrieving in the case library according to a present production working condition and finding out the closest case of the auxiliary variable and the present production working condition; and the calculation correcting device is used for modifying the granularity of the pulverized coal according to an auxiliary variable of the retrieved closest case and a present production working condition difference value to obtain the granularity of the pulverized coal under the present working condition. The system disclosed by the invention can realize online detection on the granularity of the pulverized coal so as to carry out real-time regulation on control variable of the middle-speed milling production process according to the granularity of the pulverized coal to ensure that the granularity of the pulverized coal of pulverized coal production index meets process requirements and to create beneficial production conditions for following pulverized coal injection and blast furnace production.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a measurement system for coal powder particle size of a medium-speed pulverizing system for blast furnace coal injection. Background technique [0002] Blast furnace coal injection pulverization system is an important key process in the blast furnace production process, which is conducive to the blast furnace to replace coke with coal, save energy and reduce costs. Its important process index, that is, coal powder particle size, is closely related to the subsequent process of pulverized coal injection and blast furnace production, and directly restricts the combustion performance of blast furnace coal injection. The particle size of pulverized coal has a great influence on the combustion rate, and a suitable range of pulverized coal particle size is conducive to improving the combustion rate and the replacement ratio of coal char. Therefore, it is of great significance to con...

AI Technical Summary

Problems solved by technology

At present, the main detection method of pulverized coal particle size is manual test, which is difficult to measure continuously on-line, and the manual test takes a long time to measure, and it is impossible to realize real-time adjustment of control variables in the pulverizing production process according to the feedback of pulverized coal particle size

The production process of blast furnace pulverization by coal injection has typical characteristics of nonlinearity, multi-variables, and time-varying operating conditions. There is a complex nonlinear relationship between the current of the grinding motor, the medium-speed grinding pressure and the properties of the ore, and the relationship is difficult to express with an accurate mathematical model

Therefore, it is difficult to achieve accurate measurement of coal particle size in the prior art

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