Method for reducing top-loading coke M10

Abstract

The invention provides a method for reducing top-charging coke M10, and relates to the technical field of coke oven production. Comprising the following steps: S1, blending high-quality coking coal, 1 / 3 coking coal, fat coal, gas-fat coal and lean coal; s2, adding the mixed coal from the furnace top, and ensuring that the temperature of the carbonization chamber is uniformly distributed between 950 DEG C and 1050 DEG C; s3, after coke is formed in the furnace, quenching the top-loading coke by using a dry quenching process; the top-loading coke M10 is reduced through the steps of optimizing the coal blending structure, controlling the particle size of the blended coal, improving the fluidity of the blended coal, accurately controlling the heating temperature, adopting the dry quenching process and the like, so that the method is better suitable for blast furnace production.

Description

Technical Field

[0001] The present application relates to the technical field of coke oven production, and in particular to a method for reducing top-loading coke M 10 method. Background Art

[0002] Top-loading coke is to add the coking coal from the top of the furnace into the carbonization chamber, isolate the air and strengthen the heat to form coke. Coke is widely used in blast furnace ironmaking and non-ferrous metal smelting. Coke mainly plays four roles in the blast furnace: heat supply, reducing agent, skeleton and carbon supply. Coke has a high cold strength in the blast furnace to resist the mechanical impact and wear of the coke in the process of descending in the block belt; at the same time, coke also has a high hot strength to ensure that the coke has sufficient strength and block size when it is consumed by carbon dissolution reaction in the upper part of the tuyere area, and maintains a certain particle size and strength in the dead material column area and tuyere area with higher temperature.

[0003] In the blast furnace smelting process, the permeability of the lower column of the blast furnace is almost entirely maintained by coke. 10 , directly affects the permeability of the material column in the blast furnace, and has a more significant impact on the coke ratio and utilization coefficient of the blast furnace. Its wear resistance strength M 10 The lower it is, the better the coke quality is, and the more beneficial it is to blast furnace production.

[0004] At present, the CSR of top-loading coke is between 62% and 64%. 10 Between 8.0% and 8.8%. At present, the coking industry uses large-scale top-loading coke ovens and tamping technology to reduce M 10 This method requires equipment modification, which requires large investment and long time, seriously affecting production. Since the top-loading coke oven is a 4.3-meter top-loading coke oven, it is limited by the coke oven type and cannot effectively reduce M through large-scale coke ovens and tamping technology. 10 .

[0005] In view of this, the present application aims to provide a method for reducing top loading coke M 10 method to better solve the above technical problems. Summary of the invention

[0006] The purpose of the embodiment of the present application is to provide a method for reducing top loading coke M 10 The method can solve the problem of top loading coke 10 Technical problems affecting blast furnace production above 8.0%.

[0007] The present application embodiment provides a method for reducing top loading coke M 10 The method comprises the following steps:

[0008] S1. Blend coal with a ratio of 35%-45% of high-quality coking coal, 10%-30% of 1 / 3 coking coal, 5%-15% of fat coal, 15%-25% of gas fat coal, and 15%-20% of lean coal to form a blended coal, and crush and screen the blended coal;

[0009] Specifically, in the coal blending process, high-quality coking coal is used as the main coking coal, and its proportion in the blended coal is controlled between 35% and 45% to provide sufficient bonding and strength; fat coal is added at a proportion of 5% to 15% to enhance the plasticity and bonding of coke and form a solid coke structure; and 1 / 3 coking coal is added at a proportion of 10% to 30% to adjust the volatile matter and bonding of the blended coal, while maintaining the appropriate hardness and wear resistance of the coke; gas fat coal is added at a content of 15% to 25% to reduce the cost of the blended coal, increase the fluidity of the blended coal, and maintain the stable quality of the coke;

[0010] S2. Add the blended coal from the top of the furnace, heat it in an air-tight manner, and during the heating process, ensure that the temperature of the carbonization chamber is evenly distributed between 950°C and 1050°C to ensure uniform maturity and quality of the coke;

[0011] S3. After the coke is formed in the furnace, the top coke is quenched by dry quenching process.

[0012] Furthermore, in step S1, the particle size of the blended coal after crushing and screening is controlled at 74%-82% passing through a 3 mm sieve to improve the uniformity and reactivity of the coal material.

[0013] Furthermore, in step S1, the fluidity of the blended coal is not less than 1200 ddpm.

[0014] Furthermore, in step S1, the high-quality coking coal is a type of coal with a sulfur content in the range of 0.4 to 3.0% and a caking index of 80 or more.

[0015] Furthermore, in step S1, the high-quality coking coal includes at least two of 25# low-sulfur coal, 25# medium-sulfur coal and 25# high-sulfur coal.

[0016] Furthermore, in step S2, during the heating process, a furnace head supplementary heating system is used to control the heating temperature.

[0017] Furthermore, in step S2, in the burner supplementary heating system, the amount of gas entering each fire channel is controlled by adjusting the opening of the copper ball valve at the front end of the lower nozzle and the stainless steel orifice plate, thereby controlling the temperature of the first and second fire channels of the burner and ensuring the uniformity of the temperature of the entire furnace.

[0018] Beneficial effects of the present invention:

[0019] The invention provides a method for reducing top loading coke M 10 The method comprises the steps of S1. blending high-quality coking coal, 1 / 3 coking coal, fat coal, gas fat coal and lean coal; S2. adding the blended coal from the furnace top to ensure that the temperature of the carbonization chamber is evenly distributed between 950°C and 1050°C; S3. after the coke is formed in the furnace, quenching the top-charged coke by using a dry quenching process; the present invention reduces the top-charged coke M by optimizing the blended coal structure, controlling the blended coal particle size, improving the blended coal fluidity, accurately controlling the heating temperature and using the dry quenching process. 10 , to be better suitable for blast furnace production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a flowchart of an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively by way of examples, and preferred embodiments of the present invention are given below. However, the present invention can be implemented in a variety of different forms and is not limited to the embodiments described herein. Any other implementation schemes obtained by modifying or equivalently replacing the technical scheme of the present invention without creative results are within the protection scope of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for describing specific embodiments and are not intended to limit the present invention.

[0024] The numerical values ​​disclosed in the embodiments of the present invention are approximate values, not definite values. When the error or experimental conditions permit, all values ​​within the error range may be included without being limited to the specific numerical values ​​disclosed in the embodiments of the present invention.

[0025] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0026] Example 1

[0027] This embodiment provides a method for reducing top loading coke M 10 The method comprises the following steps:

[0028] S1.25 # Low sulfur coal ratio 20%, 25 # Medium sulfur coal ratio 10%, 25 # 5% high sulfur coal, 22% 1 / 3 coking coal, 16% fat coal, 10% gas fat coal and 17% lean coal are blended to form compound coal, which is then crushed and screened to control the particle size of the crushed and screened compound coal to 78%-82% passing through a 3mm sieve to improve the uniformity and reactivity of the coal.

[0029] S2. Add the blended coal from the top of the furnace, heat it in an air-tight manner, and during the heating process, ensure that the temperature of the carbonization chamber is evenly distributed between 950°C and 1050°C to ensure uniform maturity and quality of the coke;

[0030] Specifically, in order to ensure the uniformity of the temperature in the furnace, a furnace head supplementary heating system is used to control the heating temperature. In the furnace head supplementary heating system, the opening of the copper ball valve at the front end of the lower nozzle and the stainless steel orifice plate are adjusted to control the amount of gas entering each fire channel, thereby controlling the temperature of the first and second fire channels of the furnace head and ensuring the uniformity of the temperature of the entire furnace;

[0031] S3. After the coke is formed in the furnace, the top coke is quenched by dry quenching process.

[0032] Example 2

[0033] The difference between this embodiment and embodiment 1 is only that the composition of the blended coal is different, and the remaining steps are the same as those of embodiment 1.

[0034] Specifically, the blended coal in this embodiment is composed of 25 # Low sulfur coal ratio 27%, 25 # Coal blending is carried out with a ratio of 10% for high sulfur coal, 18% for 1 / 3 coking coal, 13% for fat coal, 14% for gas fat coal and 18% for lean coal.

[0035] Example 3

[0036] The difference between this embodiment and embodiment 1 is only that the composition of the blended coal is different, and the remaining steps are the same as those of embodiment 1.

[0037] Specifically, the blended coal in this embodiment is composed of 25 # Low sulfur coal ratio 30%, 25 # The coal blending is carried out with 11% high-sulfur coal, 14% 1 / 3 coking coal, 5% fat coal, 23% gas fat coal and 17% lean coal.

[0038] The fluidity of the blended coal in Examples 1-3 and the M of the top coke formed are 10And thermal strength test, the test results are shown in the following table:

[0039] Test items / examples Coal fluidity <![CDATA[Coke M 10 > Coke thermal strength Example 1 1200 7.5 63.5 Example 2 1300 6.6 65.4 Example 3 1500 6.3 67.2

[0040] As shown in the table above, this application reduces the top-loading coke M by optimizing the coal blending structure, controlling the blending coal particle size, improving the blending coal fluidity, accurately controlling the heating temperature, and adopting the dry quenching process. 10 , while the fluidity of the coal is improved, the wear resistance of the coke M 10 The pressure drop has decreased significantly and the quality of coke has improved significantly, making it more suitable for blast furnace production.

[0041] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method to reduce top loading coke M 10 The method is characterized in that: The following steps are involved: S1. Blend coal with a ratio of 35%-45% of high-quality coking coal, 10%-30% of 1 / 3 coking coal, 5%-15% of fat coal, 15%-25% of gas fat coal, and 15%-20% of lean coal to form a blended coal, and crush and screen the blended coal; S2. Add the blended coal from the top of the furnace, heat it in an air-tight manner, and during the heating process, ensure that the temperature of the carbonization chamber is evenly distributed between 950°C and 1050°C to ensure uniform maturity and quality of the coke; S3. After the coke is formed in the furnace, the top coke is quenched by dry quenching process.

2. The method for reducing top loading coke M according to claim 1. 10 The method is characterized in that: In step S1, the particle size of the crushed and screened blended coal is controlled at 74%-82% passing through a 3 mm sieve to improve the uniformity and reactivity of the coal.

3. The method for reducing top loading coke M according to claim 1. 10 The method is characterized in that: In step S1, the fluidity of the blended coal is not less than 1200 ddpm.

4. The method for reducing top loading coke M according to claim 1 10 The method is characterized in that: In step S1, the high-quality coking coal is a type of coal with a sulfur content in the range of 0.4-3.0% and a caking index of 80 or more.

5. The method for reducing top loading coke M according to claim 1 10 The method is characterized in that: In step S1, the high-quality coking coal comprises 25 # Low sulfur coal, 25 # Medium sulfur coal and 25 # At least two of the high sulfur coals.

6. The method for reducing top loading coke M according to claim 1 10 The method is characterized in that: In step S2, during the heating process, the furnace head supplementary heating system is used to control the heating temperature.

7. The method for reducing top loading coke M according to claim 6. 10 The method is characterized in that: In step S2, in the burner supplementary heating system, the amount of gas entering each fire channel is controlled by adjusting the opening of the copper ball valve at the front end of the lower nozzle and the stainless steel orifice plate, thereby controlling the temperature of the first and second fire channels of the burner and ensuring the uniformity of the temperature of the entire furnace.

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