Technology for improving quality stability of coking charge coal

Abstract

The invention provides a technology for improving the quality stability of coking charge coal. The technology comprises the following steps: storing raw coal in a totally closed raw material coal yard, pre-crushing hard coal, uniformly mixing through a coal blending chamber in a totally closed bar-shaped mixing coal yard, crushing the obtained blended coal, damping the blended coal, and allowing the damped blended coal to go through a coal tower in order to realize final charge coking. The charge coal obtained through the technology has the characteristics of stable coal water, ash, volatile compounds and sulfur, stable coking performance and fines, and quality index stability increasing to above 4 sigma level.

Description

technical field [0001] The invention provides a method for preparing coking furnace coal, in particular a process capable of significantly improving the quality stability of coking furnace coal, and belongs to the technical field of coking coal. Background technique [0002] Divided according to the use of coal, coking coal is a type of coal used to produce coke, which is then used in the steel industry. Due to the development of my country's economy and the acceleration of industrialization, especially the vigorous development of the steel industry, my country's coking industry has also entered a period of rapid development. According to preliminary statistics, as early as 1991, my country's coke production had already ranked first in the world, and only three years later, in 1994, my country's annual coke production exceeded 100 million tons. In 2008, China's coke production totaled about 3.27. Since then, it has maintained a stable growth rate at a certain rate. [0003]...

AI Technical Summary

Problems solved by technology

In the case of such large fluctuations in moisture, it is difficult to keep the moisture in the furnace coal within an accurate range, even with various coal humidity control technologies

The instability of the coal moisture in the furnace will directly affect the quality of the obtained coke and the life of the coke oven, and will severely affect the stable operation of the entire operation process.

At the same time, in the production operation, due to the large fluctuations in the moisture content of the furnace coal, the adjustment and control of the furnace temperature will become more difficult, which will cause the temperature of the coke cake to rise and fall, and finally affect the stability of the coke quality.

[0008] 2. The ash content, sulfur content and volatile content of furnace coal fluctuate greatly

In addition, this also makes the sulfur content and production in coke oven raw gas unstable, which inevitably affects the stable operation and precise control of the gas purification unit

[0009] 3. The coking performance of furnace coal fluctuates greatly

With the increasing scarcity of coking coal resources and tight supply, the coal blending of coking raw materials is becoming more and more serious, which will affect the stability of raw coal quality. Although adjusting the coal blending ratio can weaken the impact to a certain extent, there is still a lag The problem of poor controllability makes it inevitable that the coking performance of the furnace coal will fluctuate, which will eventually lead to poor coke quality stability and affect the stable production of subsequent blast furnaces.

[0010] 4. The fineness of furnace coal fluctuates greatly

Therefore, no matter whether the process of crushing first and crushing or crushing first is adopted, the change of coal crushing performance will eventually cause fluctuations in the fineness of the furnace coal, which will affect the quality of coke and the stability of output.

[0011] At present, domestic coking enterprises generally adopt the above-mentioned conventional coking furnace coal preparation process, but due to the above-mentioned various defects, especially when various defects have superimposed effects, the resulting impact on coke quality and The precise control of the operation process has a greater impact, making the coke quality fluctuate greatly, which also makes it difficult for the subsequent gas purification system to operate stably

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