Method for reducing coke pushing current of tamping coke

Abstract

The invention provides a method for reducing coke pushing current of tamping coke, and relates to the technical field of coke production, the method comprises the following steps: S1, according to coal blending requirements, blending different coal types to obtain blended coal, the caking index G value of the blended coal being 72-77; s2, according to the size of a carbonization chamber, the mixed coal is tamped into coal cakes smaller than the carbonization chamber in a coal box through a tamping machine, the cake making time is 470-490 s, and the bulk specific gravity is 1.03-1.04 t / m < 3 >; s3, the rammed and formed coal cake is loaded into a carbonization chamber from the machine side for dry distillation, the standard temperature of a tamping coke oven is 1270-1290 DEG C, and the center temperature of the coke cake is 960-1000 DEG C; s4, after the coke in the carbonization chamber is mature, pushing out the coke by using a coke pushing machine; the method can effectively reduce the frequent phenomena of large coke pushing current and difficult coke pushing, improve the production efficiency, reduce the labor intensity, and effectively ensure the normal continuous production of the coke oven.

Description

Technical Field

[0001] The present application relates to the technical field of coke production, and in particular to a method for reducing the current of ramming coke and pushing coke. Background Art

[0002] Ramming coke is the process of adding the coking coal into the carbonization chamber from the furnace door on the side of the machine, isolating the air and strengthening the heat to form coke, and the coke pushing car uses the coke pushing rod to push the coke out of the carbonization chamber. The thrust of the coke pushing rod not only produces friction on the bottom of the carbonization chamber, but also produces a large friction on the wall of the carbonization chamber. Therefore, the motor needs to consume a large amount of coke pushing electricity, that is, consume a large amount of current, which is measured in amperes, referred to as coke pushing current. The size of the coke pushing current can indicate the difficulty of pushing the coke cake. The smaller the coke pushing current, the easier the coke is to push out, and the larger the coke pushing current, the more difficult the coke is to push out. When the problem of difficult coke pushing occurs frequently, a large amount of manual work is required to pull out the red coke, which takes a few minutes to several hours, which not only affects production efficiency but also increases the labor intensity of employees.

[0003] At present, the main methods for the coking industry to reduce the pushing current of ramming coke are: 1. Reducing the width of coal cakes, which requires equipment modification and will reduce the coke production in the single-hole carbonization chamber of the ramming coke oven; 2. Reducing the height of coal cakes will also reduce the coke production in the single-hole carbonization chamber of the ramming coke oven; 3. Prolonging the coking time will reduce the number of cokes discharged from the furnace; these three methods will affect the output of ramming coke and increase the cost of coke. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a method for reducing the current of pushing ramming coke, which can solve the technical problem that when the problem of difficult coke pushing occurs frequently, a large amount of manual pulling of red coke is required, which takes several minutes to several hours, affecting production efficiency and increasing the labor intensity of employees.

[0005] The present application provides a method for reducing the tamping coke pushing current, comprising the following steps:

[0006] S1. According to the coal blending requirements, different types of coal are blended to obtain blended coal, and the bonding index G value of the blended coal is 72-77;

[0007] S2. According to the size of the carbonization chamber, the blended coal is tamped into coal cakes smaller than the carbonization chamber using a tamping machine in the coal box. The tamping time is 470 to 490 seconds, and the bulk density is 1.03 to 1.04 t / m 3 ;

[0008] S3, loading the rammed coal cakes into the carbonization chamber from the machine side for dry distillation, the standard temperature of the ramming coke oven is 1270-1290°C, and the center temperature of the coke cake is 960-1000°C;

[0009] S4. After the coke in the carbonization chamber is mature, it is pushed out with a coke pusher.

[0010] Among them, in step S1, the ingredients of the mixed coal and their weight percentages are: 30-50% No. 35 coal, 10-40% low-sulfur coal, 5-20% medium-sulfur coal, 5-18% high-sulfur coal, 5-25% lean coal, 8-20% fat coal, and 5-10% gas coal.

[0011] In step S1, the blended coal has a moisture content of 10-14%, an ash content of ≤11%, a volatile content of 24-32%, and a sulfur content of ≤1.05%.

[0012] Wherein, in step S1, the maximum thickness Y value of the colloid layer of the blended coal is 14-18 mm, and the final shrinkage X value is ≥28 mm.

[0013] In step S1, the fineness of the blended coal is 86-89%.

[0014] The process also includes step S5, wherein the coke is introduced into the coke tank car through the coke intercepting car, and then is pulled to the bottom of the lifting derrick of the dry quenching station by an electric locomotive, and then the coke is lifted to the top of the dry quenching furnace by a crane, and is loaded into the dry quenching furnace through a distributor.

[0015] Beneficial effects of the present invention:

[0016] The present invention provides a method for reducing the pushing current of ramming coke, wherein the pushing current can be reduced by 25 to 35A by reducing the bonding index G value of the blended coal from 78 to 82 to 72 to 77; the bulk density can be reduced by 1.06 t / m 3 Reduced to 1.03-1.04t / m 3 , the coke pushing current can be reduced by 10-20A; by reducing the standard temperature of the ramming coke oven from 1300℃ to 1270-1290℃, the center temperature of the coke cake from 1000-1030℃ to 960-1000℃, the coke pushing current can be reduced by 20-40A; the method can effectively reduce the frequent occurrence of large coke pushing current and difficult coke pushing phenomena, and the coke pushing current is reduced from the original 340-380A to 250-330A, which can reduce manual pulling of red coke, improve production efficiency, reduce labor intensity, and effectively ensure the normal and continuous production of the coke oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1It is a flowchart of the method for reducing the ramming coke pushing current in the embodiment of the present application. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] The present application provides a method for reducing the tamping coke pushing current, comprising the following steps:

[0024] S1. According to the coal blending requirements, different types of coal are blended to obtain blended coal, and the bonding index G value of the blended coal is 72-77;

[0025] S2. According to the size of the carbonization chamber, the blended coal is tamped into coal cakes smaller than the carbonization chamber using a tamping machine in the coal box. The tamping time is 470 to 490 seconds, and the bulk density is 1.03 to 1.04 t / m 3 ;

[0026] S3, loading the rammed coal cakes into the carbonization chamber from the machine side for dry distillation, the standard temperature of the ramming coke oven is 1270-1290°C, and the center temperature of the coke cake is 960-1000°C;

[0027] S4. After the coke in the carbonization chamber is mature, it is pushed out with a coke pusher.

[0028] In this embodiment, in step S1, the ingredients of the mixed coal and their weight percentages are: 30-50% No. 35 coal, 10-40% low-sulfur coal, 5-20% medium-sulfur coal, 5-18% high-sulfur coal, 5-25% lean coal, 8-20% fat coal, and 5-10% gas coal.

[0029] By increasing the proportion of No. 35 coal, fat coal, and gas coal, and reducing the proportion of low-sulfur coal, medium-sulfur coal, and high-sulfur coal, the bonding index G value of the blended coal can be reduced.

[0030] In this embodiment, in step S1, the moisture content of the blended coal is 10-14%, the ash content is ≤11%, the volatile matter is 24-32%, and the sulfur content is ≤1.05%.

[0031] In this embodiment, in step S1, the maximum thickness Y value of the colloid layer of the blended coal is 14-18 mm, and the final shrinkage X value is ≥28 mm.

[0032] In this embodiment, in step S1, the fineness of the blended coal is 86-89%.

[0033] In this embodiment, step S5 is also included, the coke is introduced into the coke tank car through the coke intercepting car, and then pulled to the bottom of the lifting derrick of the dry quenching station by the electric locomotive, and then the coke is lifted to the top of the dry quenching furnace by the crane, and the coke is loaded into the dry quenching furnace through the distributor.

[0034] Example 1

[0035] Different types of coal are blended to obtain blended coal. The composition and weight percentage of the blended coal are: 35% No. 35 coal, 25% low-sulfur coal, 17% high-sulfur coal, 6% lean coal, 12% fat coal, and 5% gas coal. The bonding index G value of the blended coal is 76.6. The blended coal is rammed into coal cakes smaller than the carbonization chamber in the coal box with a tamping machine according to the size of the carbonization chamber. The tamping time is 490s, and the bulk density is 1.04t / m 3 The rammed coal cakes are loaded into the carbonization chamber from the machine side for dry distillation. The standard temperature of the ramming coke oven is 1285℃, and the center temperature of the coke cake is 985℃. After the coke in the carbonization chamber is mature, it is pushed out by a coke pusher. The coke pushing current during the coke pushing process is tested to be 320A. The coke is introduced into the coke tank car through the coke interceptor car, and then towed by an electric locomotive to the bottom of the lifting derrick of the dry quenching station. Then the coke is lifted to the top of the dry quenching furnace by a crane, and loaded into the dry quenching furnace through a distributor.

[0036] Example 2

[0037] Different types of coal are blended to obtain blended coal. The composition and weight percentage of the blended coal are: 47% No. 35 coal, 19% low-sulfur coal, 5% medium-sulfur coal, 17% lean coal, and 12% fat coal. The bonding index G value of the blended coal is 75.7. The blended coal is rammed into coal cakes smaller than the carbonization chamber in the coal box with a tamping machine according to the size of the carbonization chamber. The tamping time is 485s, and the bulk density is 1.035t / m 3The rammed coal cakes are loaded into the carbonization chamber from the machine side for dry distillation. The standard temperature of the ramming coke oven is 1280℃, and the center temperature of the coke cake is 975℃. After the coke in the carbonization chamber is mature, it is pushed out by a coke pusher. The coke pushing current during the coke pushing process is tested to be 306A. The coke is introduced into the coke tank car through the coke interceptor car, and then towed by an electric locomotive to the bottom of the lifting derrick of the dry quenching station. Then the coke is lifted to the top of the dry quenching furnace by a crane, and loaded into the dry quenching furnace through a distributor.

[0038] Example 3

[0039] Different types of coal are blended to obtain blended coal. The composition and weight percentage of the blended coal are: 38% No. 35 coal, 20% low-sulfur coal, 6% medium-sulfur coal, 21% lean coal, and 15% fat coal. The bonding index G value of the blended coal is 74.9. The blended coal is rammed into coal cakes smaller than the carbonization chamber in the coal box with a tamping machine according to the size of the carbonization chamber. The tamping time is 470s, and the bulk density is 1.032t / m 3 The rammed coal cakes are loaded into the carbonization chamber from the machine side for dry distillation. The standard temperature of the ramming coke oven is 1270℃, and the center temperature of the coke cake is 963℃. After the coke in the carbonization chamber is mature, it is pushed out by a coke pusher. The coke pushing current during the coke pushing process is tested to be 275A. The coke is introduced into the coke tank car through the coke interceptor car, and then towed by an electric locomotive to the bottom of the lifting derrick of the dry quenching station. Then the coke is lifted to the top of the dry quenching furnace by a crane, and loaded into the dry quenching furnace through a distributor.

[0040] Comparative Example

[0041] Different types of coal are blended to obtain blended coal. The ingredients and weight percentages of the blended coal are: 33% No. 35 coal, 29% low-sulfur coal, 17% high-sulfur coal, 6% lean coal, 11% fat coal, and 4% gas coal. The bonding index G value of the blended coal is 79. The blended coal is rammed into coal cakes smaller than the carbonization chamber in the coal box with a tamping machine according to the size of the carbonization chamber. The tamping time is 500s, and the bulk density is 1.06t / m 3 The rammed coal cakes are loaded into the carbonization chamber from the machine side for dry distillation. The standard temperature of the ramming coke oven is 1300℃, and the center temperature of the coke cake is 1015℃. After the coke in the carbonization chamber is mature, it is pushed out by a coke pusher. The coke pushing current during the coke pushing process is tested to be 360A. The coke is introduced into the coke tank car through the coke interceptor car, and then towed by an electric locomotive to the bottom of the lifting derrick of the dry quenching station. Then the coke is lifted to the top of the dry quenching furnace by a crane, and loaded into the dry quenching furnace through a distributor.

[0042] By reducing the bonding index G value of the blended coal from 78-82 to 72-77, the coke pushing current can be reduced by 25-35A. The reason is that after the bonding index G value is reduced, the expansion of the coal cake in the process of heating to coke in the carbonization chamber can be reduced. After the coke matures, the gap between the coke and the wall of the carbonization chamber will become larger, which can reduce the chance of coke contacting the wall of the carbonization chamber during coke pushing. The friction there will be reduced, thereby reducing the coke pushing current; by reducing the cake making time from 500s to 470-490s, the bulk density is reduced from 1.06t / m 3 Reduced to 1.03-1.04t / m 3 , the coke pushing current can be reduced by 10 to 20A. The reason is that after the pile specific gravity is reduced, the gaps between the coal particles become larger, and the expansion of the coal cake in the process of becoming coke in the carbonization chamber and being heated will be partially absorbed by the gaps between the coal particles. After the coke matures, the gap between the coke and the wall of the carbonization chamber will also become larger. When pushing the coke, the chance of the coke contacting the wall of the carbonization chamber can be reduced, and the friction there will also be reduced, so the coke pushing current will be reduced; by reducing the standard temperature of the ramming coke oven from 1300℃ to 1270~1290℃, and the center temperature of the coke cake from 1000~1030℃ to 960~1000℃, the coke pushing current can be reduced by 20 to 40A. The reason is that after the standard temperature is reduced, the coke can be prevented from being over-mature and the chance of the coke contacting the wall of the carbonization chamber after maturity is reduced, which also reduces the friction there and thus reduces the coke pushing current.

[0043] It can be seen that the method for reducing the pushing current of ramming coke provided by the present invention can effectively reduce the frequent occurrence of large pushing current and difficult coke pushing phenomena, and the pushing current is reduced from the original 340-380A to 250-330A, which can reduce manual pulling of red coke, improve production efficiency, reduce labor intensity, and effectively ensure the normal and continuous production of the coke oven.

[0044] 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 for reducing the pushing current of ramming coke, characterized in that: The steps include: S1. According to the coal blending requirements, different types of coal are blended to obtain blended coal, and the bonding index G value of the blended coal is 72-77; S2. According to the size of the carbonization chamber, the blended coal is tamped into coal cakes smaller than the carbonization chamber using a tamping machine in the coal box. The tamping time is 470 to 490 seconds, and the bulk density is 1.03 to 1.04 t / m 3 ; S3, loading the rammed coal cakes into the carbonization chamber from the machine side for dry distillation, the standard temperature of the ramming coke oven is 1270-1290°C, and the center temperature of the coke cake is 960-1000°C; S4. After the coke in the carbonization chamber is mature, it is pushed out with a coke pusher.

2. The method for reducing the ramming coke pushing current according to claim 1, characterized in that: In step S1, the ingredients of the blended coal and their weight percentages are: 30-50% No. 35 coal, 10-40% low-sulfur coal, 5-20% medium-sulfur coal, 5-18% high-sulfur coal, 5-25% lean coal, 8-20% fat coal, and 5-10% gas coal.

3. The method for reducing the ramming coke pushing current according to claim 1, characterized in that: In step S1, the blended coal has a moisture content of 10-14%, an ash content of ≤11%, a volatile content of 24-32%, and a sulfur content of ≤1.05%.

4. The method for reducing the ramming coke pushing current according to claim 1, characterized in that: In step S1, the maximum thickness Y value of the colloid layer of the blended coal is 14-18 mm, and the final shrinkage X value is ≥28 mm.

5. The method for reducing the ramming coke pushing current according to claim 1, characterized in that: In step S1, the fineness of the blended coal is 86 to 89%.

6. The method for reducing the ramming coke pushing current according to claim 1, characterized in that: The process also includes step S5, wherein the coke is introduced into the coke tank car through the coke intercepting car, and then is pulled to the bottom of the lifting derrick of the dry quenching station by an electric locomotive, and then the coke is lifted to the top of the dry quenching furnace by a crane, and is loaded into the dry quenching furnace by a distributor.

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