Method for evaluating quality of industrially produced coke by using 2Kg test coke oven

Abstract

The invention relates to a method for evaluating the quality of industrially produced coke by using a 2Kg test coke oven, which comprises the following steps: preparing a coal material, heating the 2Kg test coke oven to 800 DEG C as a charging temperature, loading the coal material into a coal box, then loading the coal box into the test coke oven, heating to 1050 DEG C according to a heating curve, stopping heating when the center temperature of a coke cake reaches 950 DEG C, naturally cooling in a furnace body to below 50 DEG C, and discharging. The method comprises the following steps: carrying out a drop test on coke for two times, carrying out ball grinding sample preparation on the dropped coke, and carrying out coke reactivity and post-reaction strength test to obtain a relational expression of industrial production coke oven data and 2Kg test coke oven data: CSR raw = 1.286 CSR test-5.522; by establishing the linear relation between the data of the 2kg test coke oven and the data of the industrial production coke oven, the industrial production coke quality is accurately evaluated through the experimental data of the 2kg test coke oven, the error is small, and coal blending can be better guided to reduce the coal blending cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical coal coking, in particular to a method for evaluating the quality of industrialized production coke by using a 2Kg test coke oven. BACKGROUND

[0002] With the large-scale of blast furnace, the quality requirement of coke is higher and higher, but the shortage of coking coal resources in China has become a bottleneck problem restricting the development of coal blending coking. Therefore, it is particularly important to effectively reduce the coal blending cost under the premise of ensuring the stability of coke quality through coal blending test, coking coal selection and variety substitution. Especially when the quality of coke fluctuates, how to quickly determine the fluctuation of coking coal quality and timely and accurately adjust the coal blending ratio requires that the coking experiment can quickly output data; the test cost of industrial production coke oven (such as more than 10kg) is high and the cycle is long, and the traditional small coke oven (<1kg) has poor correlation with industrial production. The lack of standardized 2kg coke oven test process and the insufficient representativeness of coal sample lead to test error problems, which requires the establishment of a 2kg test coke oven system for rapid detection of coke thermal performance to ensure the implementation of this work.

[0003] In the research of "M Enterprise Coal Powder Modification and Coal Blending Structure Optimization" by Chongqing University, Fan Jintao, through the analysis of the structure and performance of coking coal in M Enterprise, it is found that the high-volatile gas coal used has the advantages of low ash, low sulfur and low price, but has low caking index and poor coking performance. If it can be used in coal blending coking at a high proportion, it will help to reduce the cost of coal blending. The key is to make this coal type have coking performance through coal powder modification. In the basic research, the 2kg coke oven coking experiment shows that the addition of gas coal will cause different degrees of deterioration of coke quality, and after the coal type is modified by using coal powder modification agent, the coked coke is improved, but this patent cannot realize the evaluation of the quality of industrialized production coke by using the 2kg test coke oven. SUMMARY

[0004] The present application provides a method for evaluating the quality of industrialized production coke by using a 2Kg test coke oven, which can quickly evaluate the coke reactivity and strength after reaction of single coal or coal blending, and guide production.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A method for evaluating the quality of industrialized production coke by using a 2Kg test coke oven, comprising the following steps:

[0007] S1, water content determination is performed on the taken coal, dry coal amount is calculated, dry coal amount of 2-3kg is ensured, and industrialized coal is mixed and crushed according to the dry coal amount calculation method;

[0008] S2, the 2Kg test coke oven is heated to 800 DEG C in 2 hours as the charging temperature;

[0009] S3, the coal material treated in step S1 is loaded into a coal box, and then the coal box is loaded into the 2Kg test coke oven, and the temperature is raised to 1050 DEG C in 3-3.5h, and the center temperature of the coke cake reaches 950 DEG C to stop heating;

[0010] S4, the furnace body is naturally cooled to below 50 DEG C to discharge;

[0011] S5, the coke is subjected to 2 times of drop test;

[0012] S6, the coke after drop is subjected to grinding ball sample preparation;

[0013] S7, coke reactivity and strength test after reaction are carried out;

[0014] S8, according to the linear relationship between the industrial production coke oven data and the 2Kg test coke oven data, the relationship between the industrial production coke oven data and the 2Kg test coke oven data is: CSR 生 =1.286CSR 试 -5.522;

[0015] Among them, CSR 生 : the coke strength after reaction of the industrial production coke oven;

[0016] CSR 试 : the coke strength after reaction of the 2Kg test coke oven.

[0017] Further, the industrial coal material includes fat coal, coking coal, 1 / 3 coking coal and lean coal.

[0018] Further, the particle size of the broken coal is 70% or more of 0.5-1mm.

[0019] Further, the coal material loaded into the coal box includes the following steps:

[0020] (1) the coal is loaded twice, and after each time of loading;

[0021] (2) the surface of the coal is adjusted to be flat, and then a coal pressing rod is used to press to a specified height;

[0022] (3) an asbestos felt is covered, a pressing plate is pressed, and the pressing plate has multiple holes to ensure the discharge of the coal gas.

[0023] Further, the height of the coke subjected to 2 times of drop test is 1.8m.

[0024] Further, the diameter of the grinding ball sample preparation is 23-25mm.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1) can quickly detect the coking performance of single coal;

[0027] 2) by establishing the linear relationship between the 2kg test coke oven and the industrial production coke oven data, the experimental data of the 2kg test coke oven is used to accurately evaluate the industrial production coke quality, the error is small, and the coal blending cost can be better guided. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is the side view of the coal box described in the application.

[0029] Fig. 2 is the cross-sectional view of the coal box after the coal is loaded into the coal box.

[0030] In the figure: 1, coal box; 2, coal; 3, pressing plate. DETAILED DESCRIPTION

[0031] The specific embodiments of the application will be further described below in combination with the drawings:

[0032] The application is a method for evaluating the quality of industrial production coke by using a 2kg test coke oven, which comprises the following steps:

[0033] S1, preparation of coal;

[0034] 1) moisture determination: the moisture of the coal used is determined;

[0035] 2) calculate the dry coal amount, ensure that the dry coal amount is 2.5kg, mix and crush the industrial coal according to the dry coal amount calculation method, the industrial coal includes fat coal, coking coal, 1 / 3 coking coal and lean coal, and the particle size of the crushed coal is more than 70% of 0.5-1mm.

[0036] S2, 2kg coke oven temperature rise: the oven wall of the 2kg test coke oven is raised to 800℃ within 2 hours.

[0037] S3, loading:

[0038] 1) coal loading: see Figs. 1-2 , load coal twice, after each time of coal loading, first adjust the surface of the coal to be flat, then press it to the specified height with a coal pressing rod, cover it with an asbestos felt, press it with a pressing plate 3, and the pressing plate 3 has multiple holes to ensure the discharge of coal gas;

[0039] 2) loading: put the coal box 1 into the 2kg test coke oven;

[0040] 3) temperature rise curve: raise the temperature to 1050℃ within 3h;

[0041] 4) stop the temperature rise when the center temperature of the coke cake reaches 950℃.

[0042] S4, discharging: coke is naturally cooled in the furnace body to below 50℃ and discharged.

[0043] S5, coke is dropped twice from 1.8 meters high.

[0044] S6, after dropping, coke is ground into a ball sample with a diameter of 23-25mm.

[0045] S7, coke reactivity and post-reaction strength test is performed.

[0046] S8, data is summarized to produce a linear relationship between the coke oven and the 2kg test coke oven;

[0047] According to the provided comparison table of CSR born (industrial coke oven data) and CSR test (2kg test coke oven data), a conversion relationship between the two can be established through linear regression analysis. The following is the analysis process and results:

[0048] Table 1 (unit, %)

[0049] 1 2 3 4 5 6 CSR 生 ]] 67.8 68.9 69.5 72.3 69.6 68.9 CSR 试 ]] 56.3 57.9 58.2 60.1 58.9 58.2

[0050] The relationship between industrial coke oven data and 2kg test coke oven data is: CSR 生 = 1.286CSR 试 - 5.522.

[0051] The following examples are implemented on the premise of the technical solutions of the present application, and detailed implementation methods and specific operation processes are given, but the protection scope of the present application is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0052]

Example

[0053] A method for evaluating the quality of industrial coke using a 2kg test coke oven, comprising the following steps:

[0054] S1, 11 kinds of coking coal are mixed according to the ratio, see Table 2, the moisture content of the coal is measured, the dry coal amount is calculated, and the dry coal amount entering the furnace is ensured to be 2-3kg;

[0055] Table 2 (unit, %)

[0056]

[0057] S2, crushed to 0.5-1mm, accounting for >70%;

[0058] S3, coking according to the following parameters:

[0059] Furnace charging temperature: 800℃;

[0060] Final temperature: 1050, coke cake center temperature 950℃;

[0061] Constant temperature time: 1h after furnace out;

[0062] S5, coke 2 times drop test;

[0063] S6, after the drop of coke ball sample preparation;

[0064] S7, coke reactivity and reaction strength test;

[0065] S8, test results, see Table 3, from the test data, the method predicted coke quality and actual production of coke quality consistent, can meet the requirements of guide coal.

[0066] Table 3

[0067]

Claims

1. A method for evaluating the quality of industrially produced coke using a 2 kg test coke oven, characterized in that: The steps include: S1. Measure the moisture content of the coal and calculate the dry coal quantity to ensure that the dry coal quantity entering the furnace is 2-3 kg. Mix and crush the industrialized coal according to the dry coal quantity calculation method. S2. Raise the furnace wall temperature of the 2 kg test coke oven to 800°C within 2 hours as the charging temperature; S3, the coal treated in step S1 is loaded into a coal box, which is then loaded into a 2 kg test coke oven. The temperature is raised to 1050°C over 3-3.5 hours, and the heating is stopped when the center temperature of the coke cake reaches 950°C. S4. Cool naturally in the furnace body to below 50℃ and then take out of the furnace; S5. Carry out two drop tests on coke; S6. After falling, the coke is ground into balls for sample preparation; S7. Conduct coke reactivity and post-reaction strength tests; S8. The corresponding linear relationship is obtained based on the industrial production coke oven data and the above 2Kg test coke oven data. The relationship between the industrial production coke oven data and the 2Kg test coke oven data is: CSR 生 =1.286CSR 试 -5.522; Among them, CSR 生 : Post-reaction strength of industrial coke oven coke; CSR 试 : 2Kg test coke oven coke strength after reaction.

2. The method for evaluating the quality of industrially produced coke using a 2 kg test coke oven according to claim 1, characterized in that: The industrialized coal materials include fat coal, coking coal, 1 / 3 coking coal and lean coal.

3. The method for evaluating the quality of industrially produced coke using a 2 kg test coke oven according to claim 1, characterized in that: More than 70% of the crushed particle size is 0.5-1 mm.

4. The method for evaluating the quality of industrially produced coke using a 2 kg test coke oven according to claim 1, characterized in that: The steps of loading coal into the coal box include: (1) After each loading of coal in two batches; (2) Adjust the coal surface to a flat surface and then press it to the specified height with a coal pressing rod; (3) Cover with asbestos felt and press on a pressure plate with multiple holes to ensure the discharge of gas.

5. The method for evaluating the quality of industrially produced coke using a 2 kg test coke oven according to claim 1, characterized in that: The height of the coke for the two drop tests was 1.8 m.

6. The method for evaluating the quality of industrially produced coke using a 2 kg test coke oven according to claim 1, characterized in that: The diameter of the grinding ball sample is 23-25 ​​mm.

Images