A device and method for testing the free-flowability of coking coal in a thermoplastic state

Abstract

The invention discloses a device and method for testing the free flowability of coking coal in a thermoplastic state, belonging to the field of coal blending and coking. In view of the fact that in the prior art, only the Giraffel fluidity, Aurora expansion, cohesive index and colloidal layer index are used as coal quality indicators, but there are problems with the Giraffel fluidity as a commonly used coal thermoplastic index, and it is impossible to directly characterize the colloid Due to the quality characteristics of the body, the coke produced by different coking coals cannot be well distinguished, and the performance detection of the coking coal is not complete; the present invention enriches the vitrinite after the coal is crushed to produce coal briquettes, and puts the coal briquettes in Heating on the tray, measuring the penetration distance and the length of the line after spreading, as a new thermal plastic property of coal, to express a physical property that different coals affect the carbon structure and pore wall structure after coking, and provide a basis for coal quality detection. A new method enriches the means of coal quality detection and provides help and support for the correct use of different coking coals in coal blending.

Description

Technical field [0001] The present invention relates to the field of coal blending coking technology, more particularly, to a device and method for testing the free flow of coking coal in a thermoplastic state. Background [0002] Thermoplasticity refers to the property that a substance can flow and deform when heated, and can maintain a certain shape after cooling. Coking coal is bituminous coal and has a certain degree of adhesion, which can be coking under the condition of chamber coke oven coking. Coking coal pyrolysis, to 300 °C when the beginning of softening, to 550 °C between belongs to the thermoplastic state, coal particles will undergo melting, flow, expansion, foaming and then cured colloid - semi-coke process, due to the difference in quantity and quality of the colloid of different coals, resulting in the above pyrolysis change process There are different coking characteristics, thereby forming different semi-coke structures, so in this process has determined the c...

AI Technical Summary

Problems solved by technology

The quality characteristics of colloids are the main influencing factors for the formation of different semi-coke structures (pore structure and pore wall structure) in the thermoplastic process, but at present, the Giggler fluidity cannot be directly characterized because the colloids are composed of gas-liquid-solid three-phase, The different viscous properties of the colloid itself will produce different analytical results for the Kiwi fluidity, which is related to the characterization method of the test

There are three problems with Gie’s fluidity as a commonly used coal thermoplastic index. First, the real viscosity of high fluidity coal is underestimated, because colloids are a pseudoplastic fluid in the thermoplastic process, which conforms to the apparent viscosity with shear The characteristics of the rate increase and decrease, Kishi's measurement is pseudoplastic flow; second, the reliability of high fluidity is doubtful, because in the thermoplastic process, due to the Weissenberg effect, there may be a gap between the inner wall of the crucible and the colloid. There will be gaps, which will cause the agitator to run idly and the fluidity value will be too large; the third is that the different inert content in the coal will have a greater impact on the fluidity results

Theoretically, high fluidity will produce a thin pore wall structure with high porosity, which will lead to weakening of coke strength

[0004] After searching, the Chinese patent application number: ZL201811278207.X, the title of the invention is: a detection method and device for the correlation of coking and coalization behavior, and the application date is October 30, 2018. The device provided by the application consists of a control system, Coking coalization system, electronic balance, colloidal viscosity and thickness detector, internal pressure detector, volume deformation detector, pressure control system; under constant capacity or constant load conditions, real-time and synchronous detection of coking coalization Viscosity and thickness of colloids, volatile analysis rate and precipitation rate, internal pressure and volume expansion and contraction of colloids, etc.; by processing data, the correlation curve of coking coalization behavior and the change of probe resistance can be obtained. According to the resistance curve, the gelatinous layer is divided into the resistance rising area, the resistance falling area, the resistance constant area and the resistance steeply rising area, and the thickness of the gelatinous layer, the thickness of each structural area at different carbonization times, and the characteristic carbonization Behavior and colloidal viscosity characteristic parameters; but the essence of the application is the improvement of the Kiwi fluidity test, without considering the fluidity of the colloid is the main factor affecting the charcoal structure and pore wall structure after coking One, so no protocol was designed to detect the fluidity of colloids

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