1/3 coking coal quality evaluation method

An evaluation method, coking coal technology, applied in the direction of material inspection products, fuel oil testing, etc., can solve the problems of large evaluation differences, unclear weights, and inability to accurately match, and achieve the effect of reducing thermal performance fluctuations

Active Publication Date: 2013-09-04
武汉钢铁有限公司
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Problems solved by technology

In addition, in the procurement and use of coking coal, in the face of many coal quality evaluation indicators, how to comprehensively evaluate the coal quality of 1 / 3 coking coal, which indicators are key indicators, and how much weight each key indicator occupies is still unclear
Therefore, in production practice, most of them are experience-based, and the evaluation of 1 / 3 coking coal quality varies greatly, so that it cannot be used accurately

Method used

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Embodiment Construction

[0017] The present invention will be further described in detail through specific embodiments below.

[0018] The proportion of 1 / 3 coking coal of an enterprise is 30%, and its coal blending plan is as follows:

[0019] Gas fat coal: 5%; 1 / 3 coking coal: 30%; fat coal: 10%; coking coal 1#: 20%; coking coal 2#: 20%; lean coal: 15%. The G value of the coking coal 1# is ≥85, and the proportion of coke-forming coarse-grain mosaic structure is ≥60%, and the G value of the coking coal 2# is 80-85, and the proportion of coke-forming coarse-grain mosaic structure is 50-60%.

[0020] Gas fat coal, fat coal, coking coal 1#, coking coal 2#, and lean coal remain unchanged, and four groups of different 1 / 3 coking coals are used to carry out coal blending and coking according to the above-mentioned ratios to obtain the strength of coke after thermal reaction. See Table 1 for the data.

[0021] Table 1 The strength of coke after thermal reaction after coal blending with different 1 / 3 cokin...

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Abstract

The invention discloses a 1/3 coking coal quality evaluation method which comprises the steps as follows: (1) detecting the coal quality key index of one third coking coal to obtain a coarse grain mosaic texture proportion X, a maximum Gieseler fluidity MF and an expansion degree b; (2) setting P as the 1/3 coking coal quality evaluation index, and enabling P to be equal to the sum of 100 and 5*[K1*(X-Xj)+K2*(lgMF-lgMFj)+K3*(b-bj)], wherein Xj, MFj and bj are the coarse grain mosaic texture proportion, the maximum Gieseler fluidity and the expansion degree of the standard 1/3 coking coal respectively; K1, K2 and K3 are constants; the strength CSR after a thermal reaction with the coke is associated through the formula CSR=K+K1*X+K2*lgMF+K3*b; and K is a constant; and (3) calculating the value of P, wherein the larger P is, the higher the 1/3 coking coal quality is. The 1/3 coking coal quality evaluation method can effectively evaluate the coal quality of the 1/3 coking coal, so that reasonable pricing and scientific matching for use are achieved.

Description

technical field [0001] The invention belongs to the technical field of coal blending and coking, and in particular relates to a method for evaluating the quality of 1 / 3 coking coal. Background technique [0002] 1 / 3 coking coal is a moderately high volatile coking coal with strong caking properties, and it is a transitional coal between coking coal, fat coal and gas coal. In coal blending and coking, it has a certain fluidity and expansibility, which can fine-tune the rheology and expansibility of blended coal, and at the same time provide a certain granular mosaic structure to support the thermal performance of coke. [0003] According to the Chinese coal classification standard (GB 5751-2009), coking coal with volatile matter >28.0~37.0, G value >65, and Y value ≤25.0 is uniformly classified as 1 / 3 coking coal. However, in practical application, it is found that the national standard defines a wide range of 1 / 3 coking coal, especially the definition range of volatil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
Inventor 项茹张雪红薛改凤任玉明查海鑫鲍俊芳刘向勇宋子逵陈鹏詹立志
Owner 武汉钢铁有限公司
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