Control method of expansion degree of fired coal for binderless briquettes

Abstract

The invention discloses a method for controlling swelling degree of as-fired coal of non-adhesive type briquette coals, and belongs to the technical field of coal preparation and coking. The method for controlling the swelling degree of the as-fired coal has the advantages that the composition of the prepared coal is adjusted according to the mass percentage of non-adhesive briquette coal in the total weight of the as-fired coal, and the coking coal with high volatile matter, low swelling degree or non-swelling degree and low solid softening zone, or the coking coal with low volatile matter and non-swelling degree is increased; or, the content of coking coal with high swelling degree in percentage by mass is controlled, or the content of coking coal with high thickness of colloidal matter layer in percentage by mass is controlled, the as-fired coal is controlled to swell within the reasonable range, the coke mass is stabilized, the heat strength CSR (coke strength after reaction) of coke can reach 65% or above, and a stove wall of a coke oven is protected.

Description

technical field [0001] The invention relates to the technical field of coal blending and coking, in particular to a method for controlling the swelling degree of fired coal of binderless briquettes. Background technique [0002] Briquette coking is to knead part of the raw coal, press it into a block with a certain shape and size, and then mix it with the raw coal in a certain proportion, and put it into the coke oven for coking. Briquette coking is beneficial to increase the pile proportion of incoming coal and improve coke quality. It can also increase the amount of weakly bonded coking coal on the basis of stable coke quality and reduce the cost of coal blending for enterprises. After briquette coking began to be produced and applied in Japan in the 1870s, my country also began to study and adopt this technology. The main purpose of coking enterprises to apply this technology is to deal with waste residues generated in coking production for secondary utilization and to s...

AI Technical Summary

Problems solved by technology

For binderless briquettes, it mainly relies on high pressure to make coal particles that are not cohesive at room temperature tightly bonded together, so the bulk density is higher than that of conventional briquettes. Self-centered expansion, the expansion pushes the colloid to move around, and finally transfers to the furnace wall. Therefore, the damage to the furnace wall caused by binderless briquette coking is much greater than that of conventional briquette coking, and the higher the briquette dosage, the greater the expansion rate. If the coal blending structure of top-loading coke oven wet coal coking is still adopted in the coking process of coal briquettes, and corresponding adjustment measures are not taken, it will inevitably lead to a significant increase in the expansion degree of coal entering the furnace, damage the furnace wall, and seriously affect the coke. Furnace normal production, safety and longevity

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