CN111944550A

CN111944550A - Tamping coking mixed coal material with low coke-pushing current

Info

Publication number: CN111944550A
Application number: CN202010915742.2A
Authority: CN
Inventors: 黄先佑; 王建明; 舒文东; 于秀芳
Original assignee: Pangang Group Research Institute Co Ltd
Current assignee: Pangang Group Research Institute Co Ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2020-11-17

Abstract

The invention relates to a tamping coking blending coal material with low coke pushing current, belonging to the technical field of coking of ferrous metallurgy. The invention provides a coking blended coal material which comprises, by weight, 35-45% of coking coal, 30-50% of 1/3 coking coal and 5-15% of gas coal, wherein the standard deviation of the coking coal and the 1/3 coking coal is less than 0.1, the single coal coking CSR of the coking coal is more than or equal to 65%, the single coal coking CSR of the 1/3 coking coal is more than or equal to 62%, and the single coal coking CSR of the gas coal is more than or equal to 40%; and, the quality index of the blended coal material meets the following requirements: the dry ash-free base volatile component Vdaf is 28.5-31.5%, the bonding index G value is 78-83, the average maximum reflectivity of vitrinite is 0.85-1.35, and the fineness of the mixed coal material is 88-91%. The coal material can meet the production requirements that the coke CSR is more than or equal to 65 percent and the maximum starting coke pushing current is less than or equal to 320A.

Description

Tamping coking mixed coal material with low coke-pushing current

Technical Field

The invention relates to a tamping coking blending coal material with low coke pushing current, belonging to the technical field of coking of ferrous metallurgy.

Background

In the coking production, the coke pushing resistance is directly reflected on the coke pushing current, when a coke pushing rod contacts a coal cake, the coke pushing resistance reaches the maximum value, the coke pushing current is the maximum value, the resistance is gradually reduced after the coke cake moves, and when the coke pushing current is too large, the coke cake is difficult to move or can not move at all. The damage of the furnace wall of the carbonization chamber can be aggravated by overlarge coke pushing current, the times of repairing the furnace wall is additionally increased, the labor intensity of workers is improved, and the adverse effect is brought to normal production. This is especially true for the tamping coke oven, which has a small shrinkage after the coke is mature and a small gap between the coke cake and the oven wall, resulting in a large coke pushing current and easy damage to the oven wall. The problems of early damage and short service life of the oven body commonly exist in domestic tamping coke ovens discovered by examining the large tamping coke ovens of a plurality of domestic enterprises. When the tamping coke oven is put into operation for about 3 years, phenomena such as furnace wall degradation, cracks, channeling and the like of the carbonization chamber begin to appear; then gradually developing to the perforation of the furnace wall of the carbonization chamber, the blockage of the vertical flame path of the combustion chamber and the deformation of the furnace wall of the carbonization chamber; after the operation is carried out for 6-8 years, the number of damaged parts of the furnace body is increased, the damage speed is accelerated, the damage degree reaches or even exceeds the state of the last stage of the age of the top-loading coke oven, and the middle repair stage and the overhaul stage of the coke oven are earlier entered. On the other hand, enterprises smelting high-titanium vanadium titano-magnetite have higher requirements on CSR (strength after coke reaction) of coke, so that high-quality coke coal in a coal blending structure is higher in proportion, the coke pushing current is higher, and the normal production of the tamping coke oven is further influenced. In this context, it is necessary to develop a technique suitable for a stamp-charging coke oven with a low coke pushing current and a high CSR.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a blended coal material for coking.

The invention provides a coking blended coal material which comprises, by weight, 35-45% of coking coal, 30-50% of 1/3 coking coal and 5-15% of gas coal, wherein the standard deviation of the coking coal and the 1/3 coking coal is less than 0.1, the single coal coking CSR of the coking coal is more than or equal to 65%, the single coal coking CSR of the 1/3 coking coal is more than or equal to 62%, and the single coal coking CSR of the gas coal is more than or equal to 40%; and, the quality index of the blended coal material meets the following requirements: the dry ash-free base volatile component Vdaf is 28.5-31.5%, the bonding index G value is 78-83, the average maximum reflectivity of vitrinite is 0.85-1.35, and the fineness of the mixed coal material is 88-91%.

Wherein, the fineness of the matched coal material is represented by the mass percentage of coal with 0-3 mm granularity in all coal.

Further, the blended coal material for coking comprises, by weight, 40-45% of coking coal, 40-45% of 1/3 coking coal and 10-15% of gas coal.

Further, the blended coking coal material meets at least one of the following conditions: the single coal coking CSR of the coking coal is 65-68%; 1/3 the single coal coking CSR of the coking coal is 62-64%; the single coal coking CSR of the gas coal is 40-47%.

Further, the blended coking coal material meets at least one of the following conditions: the vitrinite reflectance of the coking coal is 1.15-1.53; 1/3 the vitrinite reflectance of the coking coal is 0.75-1.06; the vitrinite reflectance of the gas coal is 0.58-0.75.

Further, the quality index of the blended coal material meets at least one of the following conditions: the dry ash-free volatile component Vdaf is 29.8-30.3%; the value of the bonding index G is 81-83; the average maximum reflectivity of the vitrinite is 1.01-1.35; the fineness is 89.2-90.5%.

The invention provides application of the blended coal material in tamping coking.

The invention provides a tamping coking method, which takes the matched coal as a coking raw material and controls the maximum current of coke pushing starting to be less than or equal to 320A.

Further, the tamping coking method controls the maximum current of coke pushing starting to be 280-320A.

The invention provides a blended coal material for coking, which can meet the production requirements that the CSR of coke is more than or equal to 65 percent and the maximum starting coke pushing current is less than or equal to 320A, and is particularly suitable for coking of a tamping coke oven with low coke pushing current and high coke reaction strength.

Detailed Description

The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

Example 1 coking with coal blend according to the invention

According to the national bituminous coal classification standard (GB5751-86), No. 15 coking coal, No. 25 coking coal, No. 35 1/3 coking coal and No. 45 gas coal are selected for coal blending, and the standard deviation of single coal rock analysis, single coal coking coke CSR and coal blending scheme are shown in Table 1. The quality of the blended coal, the coke CSR produced by coking and the coke-pushing current are shown in Table 2 with the coal blending structure of Table 1.

TABLE 1 Single coal quality and blending scheme

TABLE 2 quality of coal charge, coke quality and coke-pushing current

In the table above, the single coal blending used in the comparative example is serious, the standard deviation of the No. 15 and No. 25 coking coals exceeds 0.3, the standard deviation of the 1/3 coking coals is between 0.2 and 0.3, and the coal blending belongs to complex coal blending. The coal blending condition of each single coal is strictly controlled according to the schemes 1-3 of the invention, so that the standard deviation of the No. 15 coking coal and the No. 25 coking coal is less than 0.1, the requirement of the single coal layer coal is met (the standard deviation is less than 0.1, the single coal layer coal belongs to), and the standard deviation of the 1/3 coking coal is less than 0.1.

It can be seen that the coal material is adopted to match the invention, the production requirements that the CSR of the coke is more than or equal to 65 percent and the maximum starting coke pushing current is less than or equal to 320A are met, and the production target of the tamping coke oven with low coke pushing current and high strength after coke reaction is realized.

It should be appreciated that the particular features, structures, materials, or characteristics described in this specification may be combined in any suitable manner in any one or more embodiments. Furthermore, the various embodiments and features of the various embodiments described in this specification can be combined and combined by one skilled in the art without contradiction.

Claims

1. The blended coal material for coking is characterized in that: the coking coal comprises, by weight, 35-45% of coking coal, 30-50% of 1/3 coking coal and 5-15% of gas coal, wherein the standard deviation of the coking coal and the 1/3 coking coal is less than 0.1, the single coal coking CSR of the coking coal is not less than 65%, the single coal coking CSR of the 1/3 coking coal is not less than 62%, and the single coal coking CSR of the gas coal is not less than 40%; and, the quality index of the blended coal material meets the following requirements: the dry ash-free base volatile component Vdaf is 28.5-31.5%, the bonding index G value is 78-83, the average maximum reflectivity of vitrinite is 0.85-1.35, and the fineness of the mixed coal material is 88-91%.

2. The blended coal charge for coking as claimed in claim 1, wherein: the coking coal comprises, by weight, 40-45% of coking coal, 40-45% of 1/3 coking coal and 10-15% of gas coal.

3. The blended coal charge for coking as claimed in claim 1, wherein: at least one of the following is satisfied: the single coal coking CSR of the coking coal is 65-68%; 1/3 the single coal coking CSR of the coking coal is 62-64%; the single coal coking CSR of the gas coal is 40-47%.

4. The blended coal charge for coking as claimed in claim 1, wherein: at least one of the following is satisfied: the vitrinite reflectance of the coking coal is 1.15-1.53; 1/3 the vitrinite reflectance of the coking coal is 0.75-1.06; the vitrinite reflectance of the gas coal is 0.58-0.75.

5. The blended coal charge for coking as claimed in claim 1, wherein: the quality index of the blended coal material meets at least one of the following requirements: the dry ash-free volatile component Vdaf is 29.8-30.3%; the value of the bonding index G is 81-83; the average maximum reflectivity of the vitrinite is 1.01-1.35; the fineness is 89.2-90.5%.

6. Use of the blended coal material of any one of claims 1 to 5 in stamp-charging coking.

7. The tamping coking method is characterized by comprising the following steps: the blended coal material of any one of claims 1 to 5 is used as a coking raw material, and the maximum current for coke pushing start is controlled to be less than or equal to 320A.

8. The stamp-charging coking method according to claim 7, characterized by: controlling the maximum current of coke pushing start to be 280-320A.