CN111621313B

CN111621313B - Tamping coal blending coking method

Info

Publication number: CN111621313B
Application number: CN202010528894.7A
Authority: CN
Inventors: 任华伟; 杨磊; 路利宾; 郎莹; 王华东; 李建莉; 张寸暖; 周繁崇; 刘利园; 王硕; 韩彤焱
Original assignee: Xingtai Xuyang Technology Co ltd; Hebei Zhongmei Xuyang Energy Co ltd
Current assignee: Xingtai Xuyang Technology Co ltd; Hebei Zhongmei Xuyang Energy Co ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2023-06-16
Anticipated expiration: 2040-06-11
Also published as: CN111621313A

Abstract

The invention provides a tamping coal blending coking method which is characterized in that main coking coal is not blended, the method comprises the steps of blending various single coking coals, wherein the single coking coals are as follows in percentage by weight: 6-9% of weak caking coal, 6-9% of gas coal, 15-25% of 1/3 coking coal, 15-25% of gas fat coal, 10-15% of fat coal, 15-20% of lean coal and 12-15% of lean weight coal. The invention realizes the following technical effects by blending coal by combining gas-fat coal and fat coal with better coking property and better caking property with lean coal and lean coal: while ensuring the quality of coke, the consumption of coking coal resources is reduced and slowed down, the coal blending cost is reduced, and the profit of the coke is improved.

Description

Tamping coal blending coking method

Technical Field

The invention belongs to the technical field of coking in coking industry, and particularly relates to a tamping coal blending coking method.

Background

Most of the conventional coal blending coking adopts coking coal, fat coal, gas coal, lean coal and the like, wherein the coking coal and the fat coal are indispensable as framework coal types.

But the coal resources in China are not large in coal types suitable for coking, particularly, the reserves of high-quality coking coals such as coking coals are less, and the regional distribution of the resources is also extremely unbalanced; and the resources of weakly caking coal, gas coal and 1/3 coking coal are relatively rich. Along with the increasing requirement of large-scale coke quality of the blast furnace, in order to improve the coke strength, the coke equal proportion in the coal blending structure is continuously improved. In addition, the coke oven is being developed to a large-sized and wide carbonization chamber, and the proportion of strongly caking coal in the blended coal is also required to be increased. It is known that the coking coal fattening ratio in the coal blending structure of the tamping coke oven of 5.5m and 6.25m still reaches 40% -50%, wherein the coking coal ratio is 20% -30%. So resources such as coking coal in China are less and less, and the resources are in shortage. Therefore, development and expansion of other weakly caking coals are needed, on one hand, the resource consumption of coking coals, fat coals and the like is reduced and slowed down, and the requirements of long-term development are met; on one hand, the coal blending cost is reduced, and the coke profit is improved.

Disclosure of Invention

The invention aims to provide a tamping coal blending coking method, which is capable of ensuring the quality of coke, meanwhile, not blending coking coal, increasing the ratio of gas coal, gas fat coal and 1/3 coking coal, and keeping the ratio of low fat coal, thereby reducing the production cost and reasonably utilizing coal resources.

In order to achieve the aim, the invention provides a tamping coal blending coking method, which is characterized in that main coking coal is not blended, the method comprises the steps of blending various single coking coals, wherein the single coking coals comprise the following components in percentage by weight: 6 to 9 percent of weak caking coal, 6 to 9 percent of gas coal, 15 to 25 percent of 1/3 coking coal, 15 to 25 percent of fat coal, 10 to 15 percent of fat coal, 15 to 20 percent of lean coal, 12 to 15 percent of lean coal,

wherein V of the fat coal _daf Less than or equal to 30 percent, the maximum fluidity of the Kelvin is more than or equal to 10000ddpm, the plasticity interval is more than or equal to 100 ℃, and the CSR of the small coke oven of 40kg is more than or equal to 60 percent or the CSR of the small coke oven of iron box experiment is more than or equal to 65 percent, and the proportion of 0.8 to 1.5 percent in the random reflectivity Re distribution of the coal-rock phase vitrinite is more than or equal to 90 percent;

v of the gas fertilizer coal _daf Less than or equal to 38%, wherein the maximum fluidity of the Kelvin is more than or equal to 10000ddpm, the plasticity interval is more than or equal to 100 ℃, and the CSR of the small coke oven of 40kg is more than or equal to 50% or the CSR of the small coke oven of iron box experiment is more than or equal to 55%, and the proportion of 0.8-1.5% in the random reflectivity Re distribution of the coal-rock phase vitrinite is more than or equal to 30%;

v of the 1/3 coking coal _daf Less than or equal to 35 percent, the CSR of the single coking coke of the small coke oven of 40kg is more than or equal to 40 percent or the CSR of the single coking coke of the iron box experiment is more than or equal to 45 percent, and the proportion of 0.8 to 1.5 percent in the random reflectivity Re distribution of the coal-rock vitrinite is more than or equal to 30 percent;

the lean coal G is more than or equal to 50, and the CSR of the small coke oven of 40kg is more than or equal to 25 percent or the CSR of the iron box experiment is more than or equal to 30 percent, and the proportion of 0.8 to 1.5 percent in the random reflectivity Re distribution of the coal petrography vitrinite is more than or equal to 20 percent; and

the lean coal G is more than or equal to 15.

The above fat coal or gas fat coal can adopt fat coal or gas fat coal with sulfur content of more than 1.5%; preferably, a fat coal or gas fat coal with a sulfur content of greater than 2% may be used. The inventor researches for a long time to find that the higher the sulfur content is, the stronger the caking property is; the price of the high-sulfur fat coal and the high-sulfur gas fat coal is very low, the sulfur conversion rate is very low (the sulfur content of the residual coke is low, and most of the residual sulfur is converted into coal gas), and the high-sulfur gas fat coal can be applied in a large proportion on the premise of ensuring that the sulfur content of the coke reaches the standard, so that the coal blending price is effectively reduced.

Preferably, the single coking coal comprises the following components in percentage by weight: 6-9% of weak caking coal, 6-9% of gas coal, 20-22% of 1/3 coking coal, 18-21% of gas fat coal, 10-15% of fat coal, 18-20% of lean coal and 12-15% of lean weight coal.

The quality index of the blended coal in the method is as follows: the moisture is less than or equal to 12 percent, the ash content is less than or equal to 10 percent, the sulfur content is less than or equal to 0.80 percent, the volatile content is 26 to 30 percent, the bonding index G is more than or equal to 68, and the maximum thickness Y of the colloid layer is more than or equal to 12.5mm; the proportion of 0.8-1.5% in the random reflectivity Re distribution of the coal-rock phase vitrinite is more than or equal to 50%, the proportion of 0.9-1.2% is more than or equal to 25%, and the reflectivity distribution curve is continuous and has no obvious notch.

In a specific embodiment, before the blending step, the weakly caking coal and the gas coal are respectively pre-crushed, and the fineness (less than 3 after the pre-crushingmm) is 85-90 wt%; the total fineness of the coal fed into the furnace (less than 3 mm) is 89-92 wt% and the bulk density is more than or equal to 1.0t/m ³ 。

In a specific embodiment, the blended coal obtained in the method is coked on a 5.5m stamp-charged coke oven, and the obtained dry quenching meets the following quality indexes: m is M ₂₅ Not less than 90% and wear resistance M ₁₀ Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 62 percent.

In another aspect, the invention provides a coking coal blend, wherein the blend comprises the following single coking coals in percentage by weight: 6 to 9 percent of weak caking coal, 6 to 9 percent of gas coal, 15 to 25 percent of 1/3 coking coal, 15 to 25 percent of fat coal, 10 to 15 percent of fat coal, 15 to 20 percent of lean coal, 12 to 15 percent of lean coal,

the lean coal G is more than or equal to 15,

wherein, the main coking coal is not matched in the blended coal.

Advantageous effects

In the tamping coal blending coking method without blending main coking coal, gas fat coal and fat coal with better coking property (represented by a coke CSR index obtained by a single coal single coking experiment) and better cohesiveness (represented by a maximum fluidity and plasticity interval index) are combined with lean coal and lean coal, so that the continuous softening and melting of various coals in the coking process, the uniformity of full engagement and coking are ensured, and the phenomenon that different coals are carbonized respectively when the main coking coal is not blended is avoided; the proportion of the strong adhesive area to the bonding area in the random reflectivity distribution of the vitrinite is ensured, so that the quality and the quantity of the active components are ensured, and the skeleton effect is achieved.

The excellent technical effects of the invention are as follows: the main coking coal is not matched, and the structure is 20% -30% lower than that of the common coal. On one hand, the consumption of coking coal resources can be reduced and slowed down, and the requirements of long-term development are met; on the other hand, the coal blending cost is reduced, and the coke profit is improved. According to the difference between coking coal and other coal types of about 300 yuan/ton, the price of coal blending per ton can be reduced by 60-90 yuan. Meanwhile, the coke quality is ensured, and the dry quenching reaches the following quality indexes: crushing strength M ₂₅ Not less than 90% and wear resistance M ₁₀ The reactive CRI is less than or equal to 6 percent, the strength CSR after reaction is more than or equal to 62 percent, and the quality index reaches the quality level of the dry quenching obtained by the tamping coal blending coking method of the matched coking coal in the prior art.

Drawings

FIG. 1 is a graph of vitrinite reflectance distribution and interval scale for example 1 of a tamping coal blending coking process without blending primary coking coal according to the present invention.

FIG. 2 is a plot of vitrinite reflectance distribution and interval scale for example 2 of a tamping coal blending coking process without blending primary coking coal according to the present invention.

Detailed Description

The foregoing description is merely an overview of the technical solutions of the present invention, and the following specific embodiments of the present invention are specifically illustrated for the purpose of making the technical contents of the present invention more clear to those skilled in the art, but these embodiments are not intended to limit the scope of the present invention. Operations not specifically disclosed below are conventional in the art.

The quality index of each individual coal employed in examples 1 and 2 below is shown in table 1 below.

TABLE 1

Example 1

The embodiment provides a tamping coal blending coking method, which comprises the steps of blending various single coking coals, wherein the various single coking coals are as follows in percentage by weight: 9% of weak caking coal, 9% of gas coal, 20% of 1/3 coking coal, 21% of high-sulfur gas fat coal, 10% of low-sulfur fat coal, 19% of lean coal and 12% of lean coal.

Respectively pre-crushing weakly caking coal and gas coal, wherein the fineness (less than 3 mm) after pre-crushing is 87.8% and 89.3%; then the individual coals are mixed evenly according to the weight percentage, and then the mixture is fed into a pulverizer together, so that the fineness of the coal fed into the furnace is 89.7 percent and the bulk density is 1.04t/m ³ 。

The following table 2 is the data of the quality index of the matched coal, and meets the requirements.

TABLE 2

A _d /％

V _daf /％

S _t，d /％

G value

Y value/mm

Fineness of/％

Standard of

≤10

26-30

≤0.80

≥68

≥12.5

89～92

Example 1

9.21

29.43

0.80

68.2

13.5

89.7

Table 3 below shows the random reflectance Re distribution data for the vitrinite of coal-rock phase, with the ratio of 0.8-1.5% 66.5% and the ratio of 0.9-1.2% 27.9% in the Re distribution of example 1, and with the reflectance distribution curves shown in FIG. 1 to be continuous without significant gaps.

TABLE 3 Table 3

Re	<0.50	0.5-0.65	0.65-0.80	0.80-0.90	0.90-1.20	1.20-1.50	1.50-1.70	1.70-1.90	1.90-2.50
										％	1.8	2.6	13.2	18.0	27.9	20.6	8.3	5.3	2.3

The quality index of the dry quenched coke 1 obtained by coking the above-mentioned blended coal on a 5.5m stamp-charged coke oven is shown in the following table 4.

TABLE 4 Table 4

	A _d /％	S _t，d /％	M ₂₅ /％	M ₁₀ /％	CRI/％	CSR/％
							Dry Coke quenching 1	12.46	0.70	93.5	5.5	28.6	62.5

As can be seen from table 4 above, by the above-described tamping coal blending coking method without blending main coking coal, the obtained dry quenched coke reached the following quality index: crushing strength M ₂₅ Not less than 90% and wear resistance M ₁₀ Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 62 percent.

Example 2

The embodiment provides a tamping coal blending coking method, which comprises the steps of blending various single coking coals, wherein the various single coking coals comprise the following components in percentage by weight: 6% of weak caking coal, 6% of gas coal, 21% of 1/3 coking coal, 8% of high-sulfur gas fat coal, 10% of low-sulfur gas fat coal, 14% of high-sulfur fat coal, 20% of lean coal and 15% of lean coal.

Respectively pre-crushing weakly caking coal and gas coal, wherein the fineness (less than 3 mm) after pre-crushing is 88.5% and 89.9%; then the single coals are mixed evenly according to a proportion and then are fed into a pulverizer together, so that the fineness of the coal fed into the furnace (less than 3 mm) is 89.4 percent, and the bulk density is 1.03t/m ³ 。

Table 5 below shows quality index data of the blended coal in example 2, which meets the requirements.

TABLE 5

A _d /％

V _daf /％

S _t，d /％

G value

Y value/mm

Fineness/%

Standard of

≤10

26-30

≤0.80

≥68

≥12.5

89～92

Example 2

9.45

28.23

0.78

68.5

14.1

89.4

Table 6 below shows the data of the random reflectance Re distribution of the vitrinite of the coal-rock phase of the blended coal in example 2, with the ratio of 0.8-1.5% 64.6% and the ratio of 0.9-1.2% 32% in the Re distribution of example 2, and the reflectance distribution curves shown in FIG. 2 are continuous without significant gaps.

TABLE 6

Re	<0.50	0.5-0.65	0.65-0.80	0.80-0.90	0.90-1.20	1.20-1.50	1.50-1.70	1.70-1.90	1.90-2.50
										％	0.8	2.5	10.7	19.8	32.0	12.8	9.0	6.6	5.8

The quality index of the dry quenched coke 2 obtained by coking the blended coal of example 2 on a 5.5m stamp-charged coke oven is shown in table 7 below.

TABLE 7

	A _d /％	S _t，d /％	M ₂₅ /％	M ₁₀ /％	CRI/％	CSR/％
							Dry Coke quenching 2	12.53	0.68	94.3	5.2	27.8	63.7

As can be seen from table 7 above, the dry quenched coke obtained by the above-described tamping coal blending coking method reaches the following quality index: crushing strength M ₂₅ Not less than 90% and wear resistance M ₁₀ Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 62 percent.

From the results of examples 1 and 2, it can be seen that the quality indexes of the blended coal and the dry quenching obtained under the condition of not blending the main coking coal in the tamping coal blending coking method of the present application meet the requirements, so that the technical effects of reducing the coal blending cost and improving the profit of the coke are realized on the premise of ensuring the coke quality.

Claims

1. The tamping coal blending coking method is characterized in that main coking coal is not blended, and the method comprises the steps of blending various single coking coals, wherein the single coking coals are as follows in percentage by weight: 6 to 9 percent of weak caking coal, 6 to 9 percent of gas coal, 15 to 25 percent of 1/3 coking coal, 15 to 25 percent of fat coal, 10 to 15 percent of fat coal, 15 to 20 percent of lean coal, 12 to 15 percent of lean coal,

the lean coal G is more than or equal to 15,

wherein, before the mixing step, respectively pre-crushing weakly caking coal and gas coal, wherein the fineness of less than 3mm after pre-crushing is 85-90 wt%; the fineness of the coal fed into the furnace is 89-92 wt% and the bulk density is more than or equal to 1.0t/m ³ ，

The quality index of the blended coal obtained by the method is as follows: the moisture is less than or equal to 12 percent, the ash content is less than or equal to 10 percent, the sulfur content is less than or equal to 0.80 percent, the bonding index G is more than or equal to 68, and the maximum thickness Y of the colloid layer is more than or equal to 12.5mm; the ratio of 0.8 to 1.5 percent in the random reflectivity Re distribution of the coal-rock phase vitrinite is more than or equal to 50 percent, the ratio of 0.9 to 1.2 percent is more than or equal to 25 percent, the reflectivity distribution curve is continuous and is free from gaps, and

the blended coal obtained by the method is coked on a tamping coke oven with the size of 5.5m, and the obtained dry quenching meets the following quality indexes: m is M ₂₅ Not less than 90% and wear resistance M ₁₀ Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 62 percent.

2. The method of claim 1, wherein the fat coal or gas fat coal is a fat coal or gas fat coal having a sulfur content of greater than 1.5%.

3. The method of claim 1, wherein the fat coal or gas fat coal is a fat coal or gas fat coal having a sulfur content of greater than 2%.

4. The method of claim 1, wherein the single coking coal and its weight percentages are as follows: 6-9% of weak caking coal, 6-9% of gas coal, 20-22% of 1/3 coking coal, 18-21% of gas fat coal, 10-15% of fat coal, 18-20% of lean coal and 12-15% of lean weight coal.

5. A coking coal blend produced by the method of any one of claims 1 to 4.