A method for characterizing the degree of coke deterioration

Abstract

The present application provides a method for characterizing the deterioration degree of coke. Among them, the method includes: obtaining the gravity dust removal ash and bag filter dust removal ash of the blast furnace, detecting and calculating the total carbon content of the gravity dust removal ash and the bag filter dust removal ash of the blast furnace; calculating the percentage of the ratio of the total carbon content to the full coke ratio of the blast furnace, and defining the percentage of the ratio as the coke deterioration index; dividing the coke deterioration degree interval according to the coke deterioration index for characterizing the deterioration degree of coke in the blast furnace. The present application solves the problem that the deterioration degree of coke in the coke oven cannot be directly observed. By calculating, the percentage of the ratio of the carbon content of the dust removal ash of the blast furnace to the full coke ratio of the blast furnace is defined as the coke deterioration index, and the coke deterioration degree interval is divided according to the coke deterioration index for characterizing the deterioration degree of coke in the blast furnace, which has a good guiding effect on predicting the operation state of the blast furnace and ensures the stable production of the blast furnace.

Description

Technical Field

[0001] This application relates to the technical field of ironmaking, and particularly relates to a method for characterizing the deterioration degree of coke. Background Art

[0002] Coke is an important raw material in the blast furnace ironmaking process. In addition to providing heat, reducing agents, and carburizing agents for blast furnace smelting reactions, it also acts as a support for the blast furnace skeleton. At the same time, as a window for the flow of blast furnace gas, it ensures the smooth flow of blast furnace gas. Therefore, coke plays a crucial role in the blast furnace smelting process, directly affecting the permeability of the blast furnace, the stable and smooth operation of the furnace condition, and various technical and economic indicators of the blast furnace.

[0003] In recent years, with the enlargement of blast furnaces and the increase in the amount of pulverized coal injection in blast furnaces, the load on coke is greater, the residence time of coke in the furnace is longer, and the degree of coke deterioration will also intensify. However, since the blast furnace is a closed system, the deterioration of coke in the blast furnace cannot be directly observed, and there is still no good method to characterize the degree of coke deterioration in the blast furnace.

[0004] Based on this, how to use a simple and effective method to characterize the degree of coke deterioration in the coke oven to ensure the stable production of the blast furnace is a technical problem to be solved urgently. Summary of the Invention

[0005] The purpose of this application is to provide a method for characterizing the degree of coke deterioration. This application solves the problem that the degree of coke deterioration in the coke oven cannot be directly observed. By calculating, the percentage of the carbon content in the blast furnace dust removal ash to the blast furnace all-coke ratio is defined as the coke deterioration index, and the coke deterioration degree interval is divided according to the coke deterioration index to be used to characterize the degree of coke deterioration in the blast furnace, which has a good guiding effect on predicting the operation state of the blast furnace and ensures the stable production of the blast furnace.

[0006] Specifically, this application adopts the following technical solutions:

[0007] According to the first aspect of the embodiments of this application, provided is that the method includes: obtaining the blast furnace gravity dust removal ash and the bag filter dust removal ash, detecting and calculating the total carbon content of the blast furnace gravity dust removal ash and the bag filter dust removal ash; calculating the percentage of the ratio of the total carbon content to the blast furnace all-coke ratio, and defining the percentage as the coke deterioration index; dividing the coke deterioration degree interval according to the coke deterioration index to be used to characterize the degree of coke deterioration in the blast furnace.

[0008] In some embodiments of the present application, based on the foregoing solution, dividing the coke deterioration degree range according to the coke deterioration index includes: when the coke deterioration index is greater than or equal to 2.5%, it indicates that the coke deterioration degree in the blast furnace is severe; when the coke deterioration index is between 1.5% and 2.5%, it indicates that the coke deterioration degree in the blast furnace is general; when the coke deterioration index is less than or equal to 1.5%, it indicates that the coke deterioration degree in the blast furnace is light.

[0009] In some embodiments of the present application, based on the foregoing solution, detecting and calculating the total carbon content of the blast furnace gravity dust and the bag filter dust includes: detecting the carbon content of the gravity dust; detecting the carbon content of the bag filter dust; calculating the total carbon content of the blast furnace gravity dust and the bag filter dust according to the carbon content of the gravity dust and the weight of the gravity dust generated per ton of iron produced, the carbon content of the bag filter dust and the weight of the bag filter dust generated per ton of iron produced.

[0010] In some embodiments of the present application, based on the foregoing solution, the smaller the coke deterioration index, the lower the coke deterioration degree, and the larger the coke deterioration index, the higher the coke deterioration degree.

[0011] In some embodiments of the present application, based on the foregoing solution, the range of the coke deterioration index is 1% to 3%.

[0012] In some embodiments of the present application, based on the foregoing solution, the total carbon content is the sum of the carbon content of the gravity dust and the carbon content of the bag filter dust.

[0013] In some embodiments of the present application, based on the foregoing solution, the blast furnace is a vertical blast furnace.

[0014] In some embodiments of the present application, based on the foregoing solution, the blast furnace gravity dust is obtained by using a gravity dust removal device.

[0015] In some embodiments of the present application, based on the foregoing solution, the blast furnace bag filter dust is obtained by using a bag filter dust removal device.

[0016] In some embodiments of the present application, based on the foregoing solution, the gravity dust and the bag filter dust are collected at the top of the blast furnace.

[0017] It can be seen from the above technical solutions that the present application has at least the following advantages and positive effects:

[0018] By adopting the solution proposed in this application, the problem of being unable to directly observe the deterioration degree of coke in the coke oven is solved. The percentage ratio of the carbon content in the blast furnace dust removal ash to the full coke ratio of the blast furnace is defined as the coke deterioration index through calculation, and the coke deterioration degree interval is divided according to the coke deterioration index to be used to characterize the deterioration degree of coke in the blast furnace, which has a good guiding effect on predicting the operation state of the blast furnace and ensures the stable production of the blast furnace. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in this application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0020] Figure 1 It shows a flowchart of a method for characterizing the coke deterioration degree in an embodiment of this application; Detailed Embodiments

[0021] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and will fully convey the concept of the example embodiments to those skilled in the art.

[0022] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of this application. However, those skilled in the art will realize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of this application.

[0023] The flowchart shown in the accompanying drawings is only an exemplary illustration, and does not necessarily include all the contents and operations / steps, nor does it necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0024] It should be noted that the terms "first", "second", etc. in the specification, claims, and above-mentioned accompanying drawings of this application are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described.

[0025] The implementation details of the technical solution of the embodiments of the present application are elaborated in detail as follows:

[0026] According to a typical implementation manner of the present application, there is provided, referring to Figure 1 , the method includes the following steps S110 to step S130 as shown:

[0027] Step S110, obtain the blast furnace gravity dust and the bag filter dust, and detect and calculate the total carbon content of the blast furnace gravity dust and the bag filter dust.

[0028] Step S120, calculate the percentage of the ratio of the total carbon content to the full coke ratio of the blast furnace, and define the percentage of the ratio as the coke deterioration index.

[0029] Step S130, divide the coke deterioration degree interval according to the coke deterioration index to characterize the coke deterioration degree in the blast furnace.

[0030] In an embodiment of the present application, the dividing the coke deterioration degree interval according to the coke deterioration index includes:

[0031] When the coke deterioration index is greater than or equal to 2.5%, it indicates that the coke deterioration degree in the blast furnace is serious.

[0032] When the coke deterioration index is between 1.5% and 2.5%, it indicates that the coke deterioration degree in the blast furnace is general.

[0033] When the coke deterioration index is less than or equal to 1.5%, it indicates that the coke deterioration degree in the blast furnace is relatively light.

[0034] In the present application, by calculating the percentage of the ratio of the total carbon content to the full coke ratio of the blast furnace, the percentage of the ratio is defined as the coke deterioration index (Coke Deterioration Index, abbreviated as CDI), and the coke deterioration index is divided into intervals to characterize the coke deterioration degree inside the coke oven, and the furnace condition during blast furnace ironmaking is reflected by the coke oven deterioration degree to ensure the stable operation of the coke oven.

[0035] In an embodiment of the present application, the detecting and calculating the total carbon content of the blast furnace gravity dust and the bag filter dust includes:

[0036] Detect the carbon content of the gravity dust.

[0037] Detect the carbon content of the bag filter dust.

[0038] Based on the carbon content of the gravity dust removal ash and the weight of the gravity dust removal ash generated per ton of iron production, the carbon content of the bag filter dust ash and the weight of the bag filter dust ash generated per ton of iron production, the total carbon content of the blast furnace gravity dust removal ash and the bag filter dust ash is calculated.

[0039] In this application, to detect the carbon content of the gravity dust removal ash and the carbon content of the bag filter dust ash, a certain amount of gravity dust removal ash and bag filter dust ash need to be obtained first. It can be obtained on a daily basis, or regularly on a weekly or monthly basis. This application does not impose special restrictions on the acquisition time of the gravity dust removal ash and the bag filter dust ash, and can be adjusted according to actual production.

[0040] In this application, assuming that the gravity dust removal ash and the bag filter dust ash are collected on a daily basis, the gravity dust removal ash and the bag filter dust ash generated by blast furnace ironmaking within one day are collected, and the carbon content of the collected gravity dust removal ash and the carbon content of the bag filter dust ash are detected. Then, the total carbon content of the blast furnace gravity dust removal ash and the bag filter dust ash is calculated based on the weight of the gravity dust removal ash generated per ton of iron production and the weight of the bag filter dust ash generated per ton of iron production.

[0041] In an embodiment of this application, the smaller the coke deterioration index, the lower the degree of coke deterioration; the larger the coke deterioration index, the higher the degree of coke deterioration.

[0042] In this application, the smaller the calculated coke deterioration index, the lower the degree of coke deterioration inside the coke oven, indicating that the furnace condition in the blast furnace is better; the larger the coke deterioration index, the worse the furnace condition in the blast furnace, and it is necessary to promptly adjust the furnace condition of the blast furnace to ensure the stable operation of blast furnace ironmaking.

[0043] In an embodiment of this application, the range of the coke deterioration index can be between 1% and 3%.

[0044] In an embodiment of this application, the total carbon content is the sum of the carbon content of the gravity dust removal ash and the carbon content of the bag filter dust ash.

[0045] In this application, blast furnace dust removal ash generally can include gravity dust removal ash and bag filter dust ash. Of course, it can also include other dust removal ash. If other dust removal ash is included, it should also be included in the solution proposed in this application, and the calculation method is the same as that of the gravity dust removal ash and the bag filter dust ash.

[0046] In an embodiment of this application, the blast furnace can be a vertical blast furnace.

[0047] In an embodiment of this application, the blast furnace gravity dust removal ash can be obtained by using gravity dust removal equipment.

[0048] In one embodiment of the present application, the blast furnace bag dust can be obtained by using bag dust removal equipment.

[0049] In one embodiment of the present application, the gravity dust and the bag dust can be collected at the top of the blast furnace.

[0050] The following specific examples are used to further illustrate the specific implementation manners of the present application, but the specific implementation manners of the application are not limited to the following examples.

[0051] In a specific embodiment of the present application, the specific implementation scheme of the method for characterizing the coke deterioration degree is as follows:

[0052] Taking a 2650 cubic - meter vertical blast furnace of a certain iron and steel enterprise as an example, the deterioration indexes and deterioration degrees calculated under different conditions are shown in the following table.

[0053]

[0054] The following makes a detailed summary of the embodiments described in the above table respectively, and three examples are selected according to the coke deterioration degree for the following detailed explanations.

[0055] Example 1

[0056] When the coke ratio of the coke oven is 380 kg / t, the ratio of coke breeze is 60 kg / t, the total coke ratio is 440 kg / t (380 kg / t + 60 kg / t), the gravity dust is 20 kg / t, the carbon content of the gravity dust is 50%, the bag dust is 10 kg / t, and the carbon content of the bag dust is 45%. The total carbon content of the gravity dust and the bag dust is calculated as 14.5 kg, (20 kg / t * 50% + 10 kg / t * 45%), and the percentage of the ratio of the total carbon content of the gravity dust and the bag dust to the total coke ratio of the blast furnace, rounded to three decimal places, is 3.295%, (14.5 kg / 440 kg / t). According to the coke deterioration degree interval divided by the coke deterioration index, it is known that the coke deterioration degree in the blast furnace at this time is severe, indicating that the blast furnace condition is poor at this time, and it is necessary to adjust the blast furnace internal condition in time to avoid affecting the efficiency of blast furnace ironmaking.

[0057] Example 2

[0058] When the coke ratio of the coke oven is 330 kg / t, the ratio of small coke is 50 kg / t, and the total coke ratio is 380 kg / t, (330 kg / t + 50 kg / t), the gravity dust removal ash is 18 kg / t, the carbon content of the gravity dust removal ash is 35%, the bag filter dust ash is 9 kg / t, and the carbon content of the bag filter dust ash is 30%. The total carbon content of the gravity dust removal ash and the bag filter dust ash is calculated to be 9 kg, (18 kg / t * 35% + 9 kg / t * 30%). The percentage of the ratio of the total carbon content of the gravity dust removal ash and the bag filter dust ash to the total coke ratio of the blast furnace, rounded to three decimal places, is 2.368%, (9 kg / 380 kg / t). According to the coke deterioration degree interval divided by the coke deterioration index, it is known that the coke deterioration degree in the blast furnace at this time is general, indicating that the blast furnace condition is general at this time. If the ironmaking efficiency needs to be improved, the furnace condition adjustment is still required.

[0059] Example 3

[0060] When the coke ratio of the coke oven is 280 kg / t, the ratio of small coke is 35 kg / t, and the total coke ratio is 315 kg / t, (280 kg / t + 35 kg / t), the gravity dust removal ash is 10 kg / t, the carbon content of the gravity dust removal ash is 30%, the bag filter dust ash is 7 kg / t, and the carbon content of the bag filter dust ash is 20%. The total carbon content of the gravity dust removal ash and the bag filter dust ash is calculated to be 4.4 kg, (10 kg / t * 30% + 7 kg / t * 20%). The percentage of the ratio of the total carbon content of the gravity dust removal ash and the bag filter dust ash to the total coke ratio of the blast furnace, rounded to three decimal places, is 1.397%, (4.4 kg / 315 kg / t). According to the coke deterioration degree interval divided by the coke deterioration index, it is known that the coke deterioration degree in the blast furnace at this time is relatively light, indicating that the blast furnace condition is good at this time, and the blast furnace condition adjustment can be not carried out.

[0061] As can be seen from the above technical solutions, the present application has at least the following advantages and positive effects:

[0062] First, by adopting the solution proposed by the present application, the problem that the deterioration degree of coke in the coke oven cannot be directly observed is solved. The percentage of the ratio of the carbon content of the dust removal ash in the blast furnace to the total coke ratio of the blast furnace is defined as the coke deterioration index, and the coke deterioration degree interval is divided according to the coke deterioration index to be used to characterize the coke deterioration degree in the blast furnace, which has a good guiding effect on predicting the operation state of the blast furnace and ensures the stable production of the blast furnace.

[0063] Second, by adopting the solution proposed by the present application, whether the blast furnace condition is stable can be reflected by the coke deterioration degree, which is beneficial to timely adjust the blast furnace road condition to ensure the stable production of the blast furnace and improve the iron output of the blast furnace.

[0064] Thirdly, by adopting the solution proposed in this application, the method is simple, fast and highly feasible, and has a high degree of agreement with the actual operation performance results of the blast furnace, avoiding the situation of the blast furnace being shut down for maintenance due to poor furnace conditions.

[0065] After considering the specification and the embodiments disclosed herein, those skilled in the art will readily conceive of other embodiments of this application. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include known common knowledge or conventional technical means in the technical field not disclosed in this application.

[0066] Although this application has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since this application can be embodied in many forms without departing from the spirit or essence of the application, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for characterizing the degree of coke deterioration, characterized in that, The method includes: Obtaining blast furnace gravity dust and bag filter dust, detecting and calculating the total carbon content of the blast furnace gravity dust and the bag filter dust; The detecting and calculating the total carbon content of the blast furnace gravity dust and the bag filter dust includes: Detecting the carbon content of the gravity dust; Detecting the carbon content of the bag filter dust; Calculating the total carbon content of the blast furnace gravity dust and the bag filter dust according to the carbon content of the gravity dust and the weight of the gravity dust generated per ton of iron produced, the carbon content of the bag filter dust and the weight of the bag filter dust generated per ton of iron produced; Calculating the percentage ratio of the total carbon content to the blast furnace full coke ratio, and defining the percentage ratio as the coke deterioration index; Dividing the coke deterioration degree interval according to the coke deterioration index to characterize the coke deterioration degree in the blast furnace; The dividing the coke deterioration degree interval according to the coke deterioration index includes: When the coke deterioration index is greater than or equal to 2.5%, it characterizes that the coke deterioration degree in the blast furnace is serious; When the coke deterioration index is between 1.5% and 2.5%, it characterizes that the coke deterioration degree in the blast furnace is general; When the coke deterioration index is less than or equal to 1.5%, it characterizes that the coke deterioration degree in the blast furnace is relatively light.

2. The method according to claim 1, wherein The smaller the coke deterioration index, the lower the coke deterioration degree, and the larger the coke deterioration index, the higher the coke deterioration degree.

3. The method according to claim 1, characterized in that, The range of the coke deterioration index is from 1% to 3%.

4. The method according to claim 1, characterized in that, The total carbon content is the sum of the carbon content of the gravity dust and the carbon content of the bag filter dust.

5. The method according to claim 1, wherein The blast furnace is a vertical blast furnace.

6. The method according to claim 1, characterized in that The blast furnace gravity dust is obtained by using a gravity dust removal device.

7. The method according to claim 1, characterized in that, The blast furnace bag filter dust is obtained by using a bag filter dust removal device.

8. The method according to claim 1, wherein The gravity dust and the bag filter dust are collected at the top of the blast furnace.

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