Coke and its preparation method and preparation device

Abstract

The invention discloses a coke and a preparation method and a preparation device thereof, and belongs to the technical field of coal blending and coking. The coke is formed by mixing and coking components including the following mass percentage contents: 1 / 3 coking coal 32-40%, fat coal 22-28%, coking coal 32-38%, and blue coke 2-5%. Compared with the prior art, blue coke is added to the coke blending coal as a thinning agent to replace coking clean coal. And by adjusting the coal blending structure, optimizing the coal preparation and coking process system under the blue coke coking state, the adaptability of blue coke is improved, the coke quality, coking rate, and by-product yield after adding blue coke are guaranteed, while saving high-quality coking coal resources, reducing production costs, and expanding the application range of blue coke.

Description

Technical Field

[0001] The invention belongs to the technical field of coal blending and coking, and in particular relates to coke blended with blue charcoal, a method for preparing the coke and a device for realizing the preparation method. Background Art

[0002] Coal blending for coking is to blend different grades of single coking coal in a certain proportion to make coke, so as to make full use of the coking characteristics of various coals to complement each other and improve the quality of metallurgical coke. Generally, several basic principles should be followed in coal blending for coking: the quality of coke should meet the requirements of users; the ash and sulfur content in the blended coal should be reduced as much as possible; it should be conducive to production and operation, and it will not cause difficulty in pushing coke due to excessive expansion pressure and damage the coke oven body; on the premise of meeting the quality of coke, increase the yield of by-products and reduce the use of high-quality coking coal; and minimize the cost of raw materials.

[0003] However, the types of raw materials for coking with coal blending are relatively fixed at present, and under the current coal structure of the metallurgical industry, its limitations have gradually emerged. In particular, the resources of coking clean coal, especially high-quality coking clean coal, are scarce and the price is high, resulting in high costs for coking enterprises. Based on the existing coal structure conditions, on the basis of meeting the quality of coke, moderately expanding coking raw materials to save high-quality coking coal resources, reduce the cost of blended coal, and improve economic benefits is one of the development directions of coal blending coking technology.

[0004] Semi-coke is a new type of carbon material with high fixed carbon content obtained by dry distilling and thermally decomposing coal tar and coal gas from non-bonding or weakly bonded high-volatile bituminous coal under medium and low temperature conditions. Since the sulfur content of semi-coke is only 10-50% of that of raw coal, it has good environmental properties and price advantages, so it has been promoted in chemical industry, gasification, and smelting injection. However, it is still a blank in the field of coking as a raw material to replace coking clean coal. How to adjust the coal structure and coal preparation coking process system to improve the coking adaptability of semi-coke is a technical problem that needs to be solved urgently. Summary of the invention

[0005] Purpose of the invention: In order to overcome the defects of the prior art, the present invention provides a coke, which is added with blue coke and ensures the adaptability of the coal blending structure.

[0006] The second object of the present invention is to provide a method for preparing the above coke.

[0007] The third object of the present invention is to provide a preparation device for implementing the above preparation method.

[0008] Technical solution: The coke described in the present invention is prepared by mixing and coking the components having the following mass percentage contents: 1 / 3 coking coal 32-40%, fat coal 22-28%, coking coal 32-38%, and blue coke 2-5%.

[0009] The quality indicators of the blue carbon include: total moisture content below 16.0%, dry basis ash content below 12.0%, dry ash-free basis volatile matter below 15.0%, and dry basis total sulfur below 0.5%.

[0010] The particle size composition of the blue carbon is that particles below 0.5 mm account for more than 50% by mass, and particles below 1.0 mm account for more than 80% by mass.

[0011] Corresponding to the above-mentioned coke, the technical solution adopted by the preparation method of the present invention is to provide each component in a quantitative ratio, mix and grind them, and then send them into the coke oven for coking, control the standard temperature at 1150-1280°C, and the coking time is 19-24h.

[0012] Furthermore, the method also includes the step of grinding the quantitatively provided blue carbon powder to a particle size of more than 50% of its own mass below 0.5 mm and a particle size of more than 80% of its own mass below 1.0 mm.

[0013] The present invention provides a technical solution adopted by a preparation device for implementing the above-mentioned preparation method, including a quantitative batching coal bin for quantitatively providing 1 / 3 coking coal, fat coal, and coking coal, a lignite batching bin for quantitatively providing lignite, a mixing pulverizer, and a coke oven. The materials quantitatively provided by the quantitative batching coal bin and the lignite batching bin enter the mixing pulverizer for crushing and mixing, and then are sent to the coke oven for coking.

[0014] Furthermore, it also includes a lignite grinder, and the lignite quantitatively provided by the lignite batching bin is crushed to a target particle size by the lignite grinder and then fed into the mixing grinder.

[0015] Beneficial effects: Compared with the existing technology, the coke coal blending method adds blue coke as a leaning agent to replace clean coking coal. By adjusting the coal blending structure, optimizing the coal preparation and coking process system under the blue coke coking state, the adaptability of blue coke is improved, the coke quality and coking rate after adding blue coke are guaranteed, and at the same time, high-quality coking coal resources are saved, production costs are reduced, and the application scope of blue coke is expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the preparation device of the present invention; DETAILED DESCRIPTION

[0017] The present invention is further described in detail with the trial production data of a domestic factory. During the trial production process, the quality indicators of the semi-coke all meet the requirements of the present invention, that is, the total moisture Mt is below 16.0%, the dry basis ash Ad is below 12.0%, the dry ash-free basis volatile matter Vdaf is below 15.0%, and the dry basis total sulfur St.d is below 0.5%. The specific quality indicators of the semi-coke incoming material inspection are shown in Table 1:

[0018] Table 1 Quality index of incoming semi-coke (%)

[0019] Serial number Mt Ad Vdaf St.d 1 12.0 10.52 11.15 0.44 2 15.4 9.43 12.53 0.26 3 11.9 11.25 10.31 0.50 4 14.5 11.31 9.87 0.28 5 14.7 12.00 11.52 0.29

[0020] The above materials were divided into two batches for trial production, and each batch of semi-coke was pre-crushed and ground to make the particle size composition meet the requirements of the present invention, ensuring that the particle size below 0.5 mm reached more than 50% of its own mass, and the particle size below 1.0 mm reached more than 80% of its own mass. The quality data of the two batches of semi-coke tested during the production process are shown in Table 2:

[0021] Table 2 Test data of semi-coke coking production

[0022]

[0023] Then, it is quantitatively fed into a mixing pulverizer with other components for crushing and mixing. The trial production ratio scheme is shown in Table 3. Among them, ratio 6 is a comparative example, which is the original metallurgical coke ratio without blue carbon:

[0024] Table 3 Distribution ratio of each group (%)

[0025]

[0026] After crushing and mixing, they are respectively sent to the 6-meter top-loading coke oven carbonization chamber with 55 or 60 holes for coking. The coking process parameters during the trial production are shown in Table 4:

[0027] Table 4 Process control requirements during trial production

[0028]

[0029] Among them, the inside and outside of the brackets are the standard temperature parameters adopted under the two coking times.

[0030] The quality data of the cokes of the above trial production ratios after inspection are shown in Table 5, among which the sixth group is the quality and cost of the original metallurgical coke products:

[0031] Table 5 Analysis of coke product quality and cost in the 6m coke oven trial production with semi-coke blending

[0032]

[0033] From the above trial production examples, it can be seen that the cold and hot strength of coke obtained by the production ratio of semi-coke is basically maintained close to the original production ratio strength. After later production verification, the coking rate of semi-coke and coal coking is similar to the original metallurgical coke ratio, achieving the goal of using a small amount of semi-coke to replace coking coal, and the quality and cost of coke are basically maintained at the original level, thus achieving the purpose of controlling coal indicators.

Claims

1. A coke, characterized in that: The coke is prepared by mixing and coking the following components in percentage by mass: 1 / 3 coking coal 32-40%, fat coal 22-28%, coking coal 32-38%, and lignite 2-5%; the quality indicators of the lignite include: total moisture content below 16.0%, dry basis ash content below 12.0%, dry ash-free basis volatile matter below 15.0%, and dry basis total sulfur below 0.5%; the particle size composition of the lignite is: the mass of particles below 0.5 mm accounts for more than 50%, and the mass of particles below 1.0 mm accounts for more than 80%. The preparation method of the coke is: each component is provided quantitatively in proportion, and the mixed and crushed components are sent into a coke oven for coking, and the standard temperature is controlled at 1150-1280°C and the coking time is 19-24h.

2. A method for preparing coke according to claim 1, characterized in that: The components are provided in a quantitative manner according to a proportion, mixed and crushed, and then sent into a coke oven for coking, with the standard temperature controlled at 1150-1280°C and the coking time at 19-24h. The step also includes grinding the quantitatively provided lignite powder to a particle size of more than 50% of its own mass if the particle size is below 0.5mm, and more than 80% of its own mass if the particle size is below 1.0mm.

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