Coke production method based on coking area fly ash and coal co-coking

Abstract

The invention discloses a coke production method based on coking area fly ash and coal co-coking, the method comprises the following steps: step 1, crushing the coking area fly ash to ensure that the volatile content of the fly ash is 9-11% and the ash content is 11-13%; step 2, adding a binder into the fly ash; the mass of the binder is 3-4% of the mass of the fly ash; step 3, pressing the fly ash into a pillow-shaped material; step 4, crushing the basic mixed coal, wherein the volatile content of the basic mixed coal is 6-8%, and the ash content of the basic mixed coal is 26-29%; step 5, mechanically mixing the blended coal with the pillow-shaped material, wherein the mass of the pillow-shaped material is 5-8% of that of the blended coal; step 6, adding water until the water content is 4-6%; and step 7, coking to obtain qualified coke. According to the invention, the fly ash is used as the coking raw material to be added into the mixed coal for coking, the qualified coke is prepared, high-value utilization of the waste fly ash in the coking area is realized, and the method has good environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of dust in a coking area, in particular to a method for producing coke based on co-coking of dust in a coking area and coal. Background technique [0002] The raw coal in the coking area produces a large amount of fine particle dust due to heating and drying of the material during the coal humidity control process. The fine particle dust is collected by the dust collector and becomes dust removal ash. The properties of the dust removal ash are different from those of the raw coal. Ash content is very high and cohesion is poor. A large amount of dust and flue gas floating dust generated during the coal charging process of the coke oven, and some dust particles generated by pyrolysis of coal, etc. are also collected by the dust removal device during the coal charging process and become dust removal ash. Contains a variety of toxic and harmful substances; in addition, CDQ will produce a larg...

AI Technical Summary

Problems solved by technology

[0004]1. The dedusting ash is used as the sintering fuel for the sintering process, but the dedusting ash is a coke powder with extremely fine particle size. Due to its fine particle size and high ash content, The calorific value is low, causing its combustion intensity to be lower than that of normal coke powder, and at the same time, part of it is drawn away by the airflow through the pores, resulting in an increase in fuel consumption

Therefore, only larger particles of dedusting ash can be used for sintering, which not only cannot realize the high-value utilization of dedusting ash, but also causes secondary dust in the screening process

[0005]2. Use CDQ dust-removal ash as the main source of dust to meet coking requirements. CDQ dust-removal dust can increase the cold strength of coke, but the used The amount is very less than 1%, and the utilization rate is low

[0006]3. The use of dedusting ash to prepare activated carbon, but it is currently limited to the experimental stage, and the CDQ dedusting ash cannot be used in a large amount in time, and the quality of the prepared activated carbon cannot be guaranteed

[0007]4. Use CDQ dedusting ash for blast furnace injection, but the ash content of dedusting ash is relatively high, resulting in an increase in the amount of blast furnace slag. The heat generated during the time cannot be fully utilized

[0008]Because the dedusting ash in the coking area contains both coal components, which have a certain degree of cohesion, and coke components, which have a certain strength, they cannot be used with high value at present At the same time, a large amount of dust will be generated during the process of transshipment and stacking, which will cause environmental pollution

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