Method for treating coke cake difficult to push in coke oven carbonization chamber

Abstract

The application discloses a processing method for coke cake difficult to push in a coke oven carbonization chamber and belongs to the technical field of high-temperature metallurgy. After the coke cake difficult to push occurs, the discharging operation of the difficult-to-push oven number is understood, and the coke pushing trolley is immediately switched to manual coke pushing. The horizontal row temperature of the combustion chamber on both sides of the difficult-to-push oven number is measured, and treatment is performed according to different difficult-to-push conditions. The processing flow after the coke cake difficult to push is standardized through secondary coke pushing, tertiary coke pushing and coke shoveling until the coke cake is pushed out. Different processing schemes are formulated by analyzing the causes of the coke cake difficult to push, the omissions during the processing of the coke cake difficult to push are reduced, and the incorrect processing mode is avoided. The analysis and judgment of the causes of the coke cake difficult to push are strengthened, the number of manual coke shoveling, the number of secondary coke pushing and the coke shoveling time are reduced, the causes of the coke cake difficult to push in the coke oven are summarized, various factors causing the coke cake difficult to push are eliminated, the frequency of the difficult-to-push oven number difficult to push again and the frequency of preventing other oven numbers difficult to push are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-temperature metallurgy, and particularly relates to a method for treating coke cake difficult to push in a coke oven carbonization chamber. BACKGROUND

[0002] Coke is a raw material for blast furnace ironmaking produced by an industrial coke oven. After raw coking coal is heated under the condition of air isolation in a coke oven carbonization chamber, it is gradually dried, dehydrated, softened, melted, bonded into blocks, shrunk and solidified into coke, and finally forms a high-temperature red coke block (i.e. high-temperature coke cake). Then the red coke is pushed out of the carbonization chamber by a coke pushing car, and is sent to coke quenching by a coke quenching car.

[0003] In coking production, with changes in furnace conditions, equipment, quality of blended coal and process parameters, the resistance during coke pushing is often too large, which causes the current during coke pushing to be too large, and further causes the coke pushing motor to trip and the coke cake in the carbonization chamber to be difficult to push out, which is referred to as coke oven difficult to push. After the coke oven is difficult to push, the machine side oven door of the difficult-to-push carbonization chamber is opened, and red coke at the head part of the oven is manually scooped out of the carbonization chamber by using a steel pick, a steel rake and other tools (the red coke is sent away after being quenched by water to normal temperature), which is commonly referred to as coke scooping.

[0004] The existing method for dealing with coke oven difficult to push is to perform coke scooping treatment and secondary coke pushing after a small amount of treatment after the coke cake is difficult to push. If the coke cake cannot be pushed out after the secondary coke pushing, then the coke cake is repeatedly scooped out after a small amount of treatment and multiple times of coke pushing. However, this treatment method cannot accurately determine the reason for the difficulty to push after the difficulty to push occurs, because the various conditions (oven number, process, oven equipment and blended coal into the oven) of the difficult-to-push oven are not fully understood. The proportion of manual coke scooping after the difficulty to push is extremely large, and the treatment time is relatively long. Generally, it takes 3-5 hours or even more than 20 hours from the difficulty to push to the completion of the treatment and the loading of coal. SUMMARY

[0005] The application aims to provide a method for treating coke cake difficult to push in a coke oven carbonization chamber, so as to solve the problems of long treatment time and difficulty to determine the reason for the difficulty to push in the prior art.

[0006] The application provides a method for treating coke cake difficult to push in a coke oven carbonization chamber, which comprises the following steps:

[0007] S1) After the coke cake is difficult to push, the out-of-oven operation of the difficult-to-push oven number is understood. If the coke pushing rod of the coke pushing car does not contact the coke cake and trips or the coke cake on the machine side is not obviously extruded and deformed, step S2) is performed. If it is other conditions, step S3) is performed.

[0008] S2) The coke pushing car is immediately switched to manual coke pushing, and it is confirmed whether the coke cake is pushed out. If the coke cake is pushed out, step S7) is performed. If the coke cake is not pushed out, step S3) is performed.

[0009] S3) Measure the temperature of the adjacent combustion chamber on both sides of the difficult pushing furnace number, immediately arrange the temperature control of the adjacent combustion chamber after measuring the horizontal row temperature, and immediately check the process, furnace body condition, pushing mechanical equipment and matching coal condition of the difficult pushing furnace number, analyze and judge the reason for the increase of pushing resistance, and then proceed to step S4);

[0010] S4) According to the preliminary conclusion of the analysis and judgment, arrange the difficult pushing furnace number for secondary pushing, confirm whether the coke cake is pushed out, if it is pushed out, proceed to step S7), if it is not pushed out, proceed to step S5);

[0011] S5) If the secondary pushing fails to push out, the main reason for the difficulty is usually the problem of the carbonization chamber furnace body or the poor shrinkage of the matching coal, the coke in the furnace body which is in close contact with the carbonization chamber is scraped out, and then the third pushing is carried out, to confirm whether the coke cake is pushed out, if it is pushed out, proceed to step S7), if it is not pushed out, proceed to step S6);

[0012] S6) A steel bucket is installed under the pushing rod head of the machine side pushing car to continue to scrape the coke, the scraping step includes pushing rod forward, backward and manual red coke, and is repeated until the remaining coke cake is pushed out;

[0013] S7) The adjacent combustion chamber returns to normal heating, and the coking time of the adjacent furnace number is arranged to prevent difficult pushing, and the condition of the carbonization chamber wall and bottom of the difficult pushing furnace number is checked;

[0014] S8) Analyze and summarize the reasons for the difficulty in pushing according to various conditions, take corresponding treatment measures, if temporary treatment is not available, the difficult pushing furnace number is regarded as a special furnace number, special coal charging amount and coking time are arranged, after the treatment is completed, the furnace door is closed, the temperature is raised for about 30 minutes and the coal charging amount is reduced, the coking time is arranged, and then the normal production is gradually restored, and the coking time of the adjacent furnace number is also re-arranged to prevent difficult pushing caused by immature coke.

[0015] As a further scheme of the present application: when measuring the temperature, only half of the vertical fireway temperature is measured, and the measurement starts 5-6 minutes after the heating gas is reversed.

[0016] As a further scheme of the present application: the method of secondary pushing in S4) includes:

[0017] S4.1) In S3), if the temperature of multiple vertical fireways is lower than 1200℃, the coke cake is immature, and the coke cake needs to be soaked for 1-2 hours before secondary pushing;

[0018] S4.2) If the coke cake is mature and the process and matching coal conditions are normal, replace the pushing car and the coke blocking car for secondary pushing;

[0019] S4.3) If the coke cake is blocked due to excessive coal loading, first use the flat coal rod to flatten the coke cake, moderately coke the coke side, and then perform secondary coke pushing;

[0020] S4.4) If the coke cake on the coke side has entered the coke blocking car, first withdraw the coke guide grid, replace the coke blocking car, and then perform secondary coke pushing;

[0021] S4.5) If the shrinkage of the combined coal is poor and the shrinkage joint of the coke cake is not obvious, and the groove formed by the erosion of the bottom or wall of the carbonization chamber is large, then immediately arrange for coke side coke raking, rake out all the red coke between the first coal loading hole on the coke side and the furnace head, and then perform secondary coke pushing.

[0022] As a further scheme of the present application: the steel bucket in S6) is a three-prism hollow bucket with a straight triangle on the side.

[0023] As a further scheme of the present application: during the difficult pushing process, S2) to S6) are all manual mode pushing in the unchained state.

[0024] As a further scheme of the present application: during the difficult pushing process, if the coke raking time is too long, causing the wall temperature of the carbonization chamber furnace head to be lower than 700°C, then the coke raking needs to be temporarily stopped, the furnace door needs to be closed, the wall temperature needs to be raised to 900-1000°C, and then the furnace door needs to be opened to continue the coke raking.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] 1. The difficult pushing treatment process of the coke cake is standardized, different treatment schemes are developed by analyzing the causes of the difficult pushing of the coke cake, the omissions during the treatment of the difficult pushing of the coke cake are reduced, and the incorrect treatment methods are avoided. The analysis and judgment of the causes of the difficult pushing of the coke cake are strengthened, the number of manual coke raking, the number of secondary coke pushing, and the coke raking time are reduced.

[0027] 2. The causes of the difficult pushing of the coke cake in the coke oven are summarized, and by eliminating various factors causing the difficult pushing of the coke cake, the frequency of the difficult pushing of the difficult pushing furnace number again and the prevention of the difficult pushing of other furnace numbers is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to facilitate understanding by those skilled in the art, the present application will be further described below with reference to the accompanying drawings.

[0029] Figure 1 A flowchart of a treatment method for the difficult pushing of the coke cake in the carbonization chamber of a coke oven. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, i.e., the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Please refer to Figure 1 As shown in the accompanying drawings, in the embodiments of the present application, a method for handling coke cake difficult to push in a coke oven carbonization chamber comprises the following steps:

[0033] Step S1: After the coke cake is difficult to push, the out-of-chamber operation of the difficult-to-push oven is understood. If the coke pushing rod of the coke pushing car does not contact the coke cake and trips or the coke cake on the machine side is not obviously extruded and deformed, the factors causing the coke cake difficult to push are usually the coke pushing interlocking fault, the electrical fault of the coke pushing car or the misoperation of the operator, and step S2 is immediately performed. If it is other conditions, step S3 is performed.

[0034] Step S2: Immediately switch to manual coke pushing of the coke pushing car. At this time, it can be successfully pushed out without any treatment. Then it is confirmed whether the coke cake is pushed out. If it is pushed out, step S7 is directly performed. If it is not pushed out, step S3 is performed.

[0035] Step S3: Measure the temperature of the adjacent combustion chamber transverse row of the difficult-to-push oven. After measuring the transverse row temperature, immediately arrange the temperature control of the adjacent combustion chamber to prevent the coke cake from being over-fired during the treatment of the difficult-to-push process due to the temperature being too high, and also to avoid the temperature of the vertical fire channel being too low. At the same time, immediately check the process of the difficult-to-push oven, the condition of the oven body, the coke pushing mechanical equipment and the matching coal condition, analyze and judge the reasons for the increase of the coke pushing resistance, and then perform step S4. When measuring the temperature, only half of the vertical fire channel temperature can be measured. After the heating gas is reversed, the measurement starts 5-6 minutes later.

[0036] Step S preliminary conclusion, arrange the difficult-to-push oven to perform secondary coke pushing, confirm whether the coke cake is pushed out. If it is pushed out, step S7 is performed. If it is not pushed out, step S5 is performed.

[0037] The method for secondary coke pushing comprises:

[0038] Step S4.1: In the S2 measurement of the horizontal row temperature, if the temperature of the vertical fireway is lower than 1200℃, the coke cake is immature, and the coke cake needs to be smothered for 1-2 hours before the second push of coke is arranged to extend the coking time.

[0039] Step S4.2: If the coke cake is mature and the raw materials and process conditions are normal, replace the pusher car and the coke blocking car for the second push of coke. If the coke cake as a whole does not move and the condition of the coke blocking car guide grate and the relative level of the bottom of the coke side furnace door are normal, the coke blocking car does not need to be replaced.

[0040] Step S4.3: If the coal loading is too much, causing the mouth to be blocked, first use the flat coal rod to flatten the coke cake and need to flatten the coke several times back and forth, and then arrange the second push of coke. A small amount of coke is removed on the coke side, which means that the vertical surface is as flat as possible, and it is generally completed within 30 minutes.

[0041] Step S4.4: If the coke cake on the coke side has entered the coke blocking car, first exit the guide grate, replace the coke blocking car, and then perform the second push of coke.

[0042] Step S4.5: If the shrinkage of the mixed coal is poor and the coke cake shrinkage joint is not obvious, and the groove formed by the erosion of the carbonization chamber bottom or wall is large, usually most of this groove is the groove below the first coal charging hole on the coke side. Immediately arrange the coke side to remove the red coke between the first coal charging hole and the furnace head about 2-3 meters, and then perform the second push of coke. Through the above steps, most of the difficult-to-push coke cakes can be pushed out in the second push of coke.

[0043] Step S5: If the second push of coke fails, the main reason for the difficulty in pushing is usually the problem of the carbonization chamber furnace body or the poor coking shrinkage of the mixed coal. The coke that is in close contact with the carbonization chamber in the machine and coke side furnace body is removed, and then the third push of coke is performed to determine whether the coke cake is pushed out. If it is pushed out, step S7) is performed, and if it is not pushed out, step S6) is performed.

[0044] The problems of the carbonization chamber furnace body usually include wall groove, wall scab, wall graphite protrusion, wall extrusion deformation, and uneven bottom. Through this re-removal of coke, the remaining coke cake can generally be pushed out.

[0045] Step S6: A steel bucket is installed under the head of the pusher rod of the machine side pusher car to continue to remove the coke. The steel bucket is a three-prism hollow bucket with a straight triangle on the side, which needs to remove the coke about 2 meters at a time, and try to push out the coke cake at one time next time to reduce the number of push times to prevent the coke cake from collapsing.

[0046] It should be noted that during the difficult-to-push process, S2-S6 push is in manual mode under the condition of disengaging the interlocking state to enhance the control of the push process.

[0047] In addition, in the difficult pushing process, if the coking chamber furnace head wall temperature is lower than 700℃ due to too long coking time in the processes of S4) to S6), the coking should be temporarily stopped, the furnace door should be closed, the wall temperature should be raised to 900-1000℃, and then the coking should be continued.

[0048] Step S7: The adjacent coking chamber is restored to normal heating, the coking time of the adjacent furnace number is arranged to prevent difficult pushing, and the coking chamber wall and bottom conditions of the difficult pushing furnace number are checked.

[0049] Step S8: The main and secondary causes of difficult pushing are analyzed and summarized according to various conditions, and corresponding treatment measures are taken, such as temporarily unable to handle, arranging special coal charging amount and coking time for the difficult pushing furnace number as a special furnace number, closing the furnace door after the treatment is completed, raising the temperature for about 30 minutes and reducing the coal charging amount, arranging the coking time, and then gradually resuming normal production. The coking time of the adjacent furnace number should also be rearranged to prevent difficult pushing caused by immature coke.

[0050] The above content is only an example and description of the structure of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the structure of the present application or exceed the scope defined by the present claims, which should belong to the protection scope of the present application.

Claims

1. A method for treating the difficulty in pushing away coke cake in the carbonization chamber of a coke oven, characterized in that: The steps include: S1) After the coke cake is difficult to push, the unloading operation of the furnace number is understood. If the pushing rod of the coke pushing car does not touch the coke cake and trips, or the coke cake on the machine side is not significantly squeezed and deformed, then proceed to step S2. If otherwise, proceed to step S3. S2) Immediately switch to manual coke pushing with the coke pushing car to confirm whether the coke cake has been pushed out. If so, proceed to step S7). If not, proceed to step S3); S3) Measure the horizontal row temperatures of adjacent combustion chambers on both sides of the difficult-to-push furnace. Immediately arrange temperature control of the adjacent combustion chambers after measuring the horizontal row temperatures. Simultaneously, immediately check the process, furnace condition, coke pushing machinery and equipment, and the condition of the coke pushing coal of the difficult-to-push furnace. Analyze and determine the cause of the increased coke pushing resistance, and then proceed to step S4. S4) Based on the preliminary conclusion of the analysis and judgment, arrange the furnace number that is difficult to push for secondary coke pushing to confirm whether the coke cake is pushed out. If so, proceed to step S7). If not, proceed to step S5); S5) If the second coke pushing fails, the main reason for the difficulty in pushing is usually a problem with the carbonization chamber furnace body or poor coke shrinkage of the coke-forming coal. The coke in the furnace body on the machine and coke side that is close to the carbonization chamber is scraped out. Then, the third coke pushing is performed to confirm whether the coke cake is pushed out. If it is, proceed to step S7. If it is not, proceed to step S6. S6) A steel bucket is installed under the coke pushing rod head of the coke pushing car on the machine side to continue to remove the coke. The coke removing steps include the coke pushing rod moving forward to shovel the coke, moving backward, and manually removing the red coke. This process is repeated until the remaining coke cake is pushed out. S7) The adjacent combustion chambers resume normal heating, arrange the coking time of the adjacent furnaces to prevent difficulty in pushing, and check the wall and bottom conditions of the carbonization chamber of the furnace that is difficult to push; S8) Analyze and summarize the reasons for the difficulty in pushing the furnace based on various situations, and take corresponding treatment measures. If the treatment cannot be carried out temporarily, treat the furnace number that is difficult to push as a special furnace number, arrange a special coal loading amount and coking time, close the furnace door after the treatment is completed, heat up for 30 minutes and reduce the coal loading amount, arrange the coking time, and then gradually resume normal production. The coking time of adjacent furnace numbers should also be rearranged to prevent difficulty in pushing the furnace due to immature coke.

2. The method for treating the hard-to-pull coke cake in the coking chamber of a coke oven according to claim 1, characterized in that: When measuring the temperature in step S3), only the temperature of half of the vertical fire channel is measured, and the measurement is started 5-6 minutes after the heating gas is reversed.

3. The method for treating the hard-to-pull coke cake in the coking chamber of a coke oven according to claim 1, characterized in that: The secondary focus pushing method in S4) includes: In the horizontal temperature measurement of S4.1) mentioned in S3), if the temperature of multiple vertical flues is lower than 1200℃, the coke cake is not mature and needs to be suffocated for 1-2 hours before the second coke pushing. S4.2) If the coke cake is mature and the coal and process conditions are normal, replace the coke pushing car and the coke blocking car for secondary coke pushing; S4.3) If the coal is overloaded and causes blockage, first use a coal leveling rod to level the coke cake, moderately scrape the coke side, and then push the coke a second time; S4.4) If the coke cake on the coke side has entered the coke blocking car, first withdraw the coke guide grid, change the coke blocking car, and then push the coke a second time; S4.5) If the shrinkage of the blended coal is poor and the shrinkage seam of the coke cake is not obvious, and the grooves formed by erosion on the bottom or wall of the carbonization chamber are large, immediately arrange for the coke side to be stripped out, and all the red coke between the first coal loading hole on the coke side and the burner head shall be stripped out, and then the second coke pushing shall be carried out.

4. The method for treating the hard-to-pull coke cake in the coking chamber of a coke oven according to claim 1, characterized in that: The steel bucket in S6) is a triangular prism-shaped hollow bucket with a right-angled triangle side.

5. The method for treating the hard-to-pull coke cake in the coking chamber of a coke oven according to claim 1, characterized in that: During the difficult-to-push processing, S2) to S6) are all manual focus pushing in the unlocked state.

6. The method for treating the hard-to-pull coke cake in the coking chamber of a coke oven according to claim 1, characterized in that: During the difficult-to-push process, in the process S4)-S6), if the de-scorching time is too long and the wall temperature of the carbonization chamber furnace head is lower than 700°C, it is necessary to temporarily stop de-scorching, close the furnace door, and raise the wall temperature to 900-1000°C, and then open the furnace door to continue de-scorching.

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