Prediction method of crushing strength of coke for coal blending coking

Abstract

The invention discloses a prediction method of the crushing strength of coke for coal blending coking. The method comprises the following steps: (1) measuring coking optical textures of all single-grade coals for coking to obtain the sum L of the contents of a coarse grain embedding component, a medium grain embedding component and an incomplete fiber component in coal blending, the sum T of the contents of an isotropic component and a fine grain embedding component as well as the content X of a fiber component; (2) measuring the Gieseler fluidity of the coal blending to obtain a Gieseler plastic flow area S within the temperature range of 450-500 DEG C; (3) setting M40 to be equal to A+B*L+C*T+E*X+F*1gS, wherein M40 represents the crushing strength of the coke, the unit is percent, and A, B, C, E and F are constants; (4) calculating the predicted value of the crushing strength of the coke. According to prediction method, a coal blending coking test does not need to be carried out due to fewer influence factors and a simple predictor formula, and a coal blending scheme is better adjusted according to the predicted results, so that the practice of coal blending coking is effectively guided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a method for predicting the crushing strength of coke for coal blending and coking. Background technique [0002] Coke is an irregular porous body containing cracks and defects mainly composed of carbon. The crushing strength of coke refers to the ability of coke to resist external impact without breaking along cracks or defects in the structure, M 40 The value is the most commonly used index to characterize the cold crushing strength of coke, M 40 The higher the value, the higher the coke crushing strength. The number of cracks in coke directly affects the crushing strength of coke, and its index is generally measured by crack degree (referring to the length of cracks in coke per unit volume). Coke cracks include primary macro-cracks and micro-cracks. When coke is damaged by various factors, firstly, macro-cracks cause coke to break up, and secondly,...

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Problems solved by technology

[0005] The above method has the following deficiencies: 1. coke is a solid material, its physical and chemical properties are closely related to the micro-optical structure, and the selected blending coal index ash (A d ), volatile matter (V daf ), cohesion index (G) and colloidal layer thickness (Y) are only indicators of apparent technological properties, without considering the coking optical structure of each single coal involved in coking, which has limitations; ②Ash content (A d ) as a predictor of coke strength has the following problems: the mechanism of ash content affecting coke strength is mainly that when the coke porous body shrinks at high temperature, the mineral particles have an expansion stress opposite to the direction of the shrinkage stress and produce radioactive cracks centered on it

The minerals in the blended coal ash include metal oxides and non-metal oxides. Due to the obvious difference in thermal expansion of metals and non-metals, some coking coals have the same ash value, but due to the difference in the content of metal oxides It will lead to differences in coke strength changes caused by ash factors, so predicting coke strength with coal ash Ad is obviously not scientific

[0006] 2) Coking enterprises adjust the coal blending ratio through the coking test of coal blending in small coke ovens, investigate the crushing strength of test coke, and obtain a suitable coal blending ratio. The disadvantage is that the test workload is large and the cycle is long

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