Method for detecting moisture distribution at material layer in chain grate machine in pelletizing production process

Abstract

The invention discloses a method for detecting the moisture distribution at a material layer in a chain grate machine in the pelletizing production process. The method comprises the following steps of: step 1, data acquisition, wherein the acquired production data comprise green ball moisture, pelletizing particles, material layer hole rate, pelletizing inlet temperature, cloth height, speed of the chain grate machine, hot wind flow and hot wind temperature; step 2, modeling, comprising the step of establishing a water containing calculation model equation in gas and palletizing; and step 3, solving, comprising the steps of dividing a solving region into differential grids, and solving the model equation by utilizing a limit differential method, so as to obtain the calculation value of the material layer moisture. The method disclosed by the invention can be used for flexibly and conveniently detecting the moisture distribution of the material layer of the chain grate machine in the pelletizing production process.

Description

technical field [0001] The invention relates to a method for detecting moisture distribution in a grate material layer during pellet production, and belongs to the field of iron and steel metallurgy. Background technique [0002] In recent years, my country's iron and steel industry has developed rapidly. In 2010, the output of crude steel reached 627 million tons, and the output of blast furnace iron reached 590 million tons, ranking first in the world. The large-scale and modernization of the blast furnace put forward higher and higher requirements for the charge, and the reasonable charge structure of the blast furnace has been paid more and more attention. [0003] Iron ore oxidized pellets provide the blast furnace with fine material with good strength, high iron grade, good reducibility, uniform particle size, stable composition, good physical and chemical properties and good metallurgical properties, which greatly strengthens the smelting process and meets the require...

AI Technical Summary

Problems solved by technology

The deformation and rupture of the pellets will deteriorate the air permeability of the pellet material layer, which will bring difficulties to the preheating and roasting process, which will eventually lead to a decrease in productivity, uneven quality of finished balls, and even accidents such as ring formation in the rotary kiln.

[0006] The grate machine is a relatively closed system, and it is difficult to directly detect the change of moisture content in the material layer during the production process

In actual production, the drying process control can only rely on the experience of the operator, through a period of observation and trial. The production experience of the operator is relatively high, and the adjustment takes a long time. It is difficult to ensure the accuracy of the drying control of the chain grate.

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