Preparation method of calcined petroleum coke for low trace element prebaked anode

Abstract

The application discloses a preparation method of low-microelement calcined petroleum coke for prebaked anodes, and belongs to the technical field of petroleum coke calcination production, and comprises the following steps: S1, a production control system obtains comprehensive indexes of microelements of calcined petroleum coke based on default technical standards and a default calcination program; S2, whether the range of the microelements M meets the latest control standards is judged, and when the range does not meet the latest control standards, step S3 is entered; S3, the system queries a pre-marked low-M calcination program, and obtains new comprehensive indexes of microelements of the calcined petroleum coke; S4, whether the range of the new microelements M meets the latest control standards is judged, and when the range does not meet the latest control standards, step S5 is entered; S5, the proportion of petroleum coke raw materials is adjusted, and the microelements are obtained and compared until the range of the microelements M meets the latest control standards; S6, a production program is executed; and S7, the microelements of the calcined petroleum coke are detected. The changed technical standards are accurately controlled by first selecting and calling the calcination program, and the production cost is controllable.

Description

Technical Field

[0001] This invention relates to the field of petroleum coke calcination production technology, specifically to a method for preparing calcined petroleum coke for low-trace element prebaked anodes. Background Technology

[0002] The content of trace elements in petroleum coke used for prebaked anodes is strictly controlled. The main way to control trace elements in production is through the selection and blending of petroleum coke raw materials. The control system can establish a database of the trace element content of commonly used petroleum coke raw materials and the trend of changes before and after calcination based on experiments and production verification, so as to automatically push the batching scheme. This reduces the workload of repeatedly testing the composition and designing the proportion of petroleum coke from different sources or batches each time. Similar methods can be found in the introduction of, for example, Chinese invention patent "A method for controlling the content of trace elements in carbon anodes" (publication number CN101701343A).

[0003] Previously, the control of trace element content in petroleum coke used for prebaked anodes was mostly based on overall industry standards. However, as end-user technical requirements have become more refined, some users have begun to demand stable control of the content of one or two trace elements (non-S metallic or non-metallic elements), and the control standards are higher than those of the previous overall control. In this case, there is no existing solution for precise control of trace elements using the existing system, and simply increasing the amount of high-quality, high-grade petroleum coke raw materials cannot meet the requirements of cost control. Summary of the Invention

[0004] To address the problems raised in the background technology, this invention proposes a method for preparing calcined petroleum coke for low-trace element prebaked anodes. This method can cope with changes in specific trace element technical standards. Based on prior production verification and information marking, it attempts to precisely control the changed technical standards by first selecting and calling the calcination process. It does not require an immediate and significant increase in the proportion of high-grade petroleum coke raw materials, thus meeting the technical requirements proposed by users while ensuring that the calcined petroleum coke product has controllable production costs.

[0005] The specific technical solution adopted in this invention is as follows:

[0006] A method for preparing calcined petroleum coke for low-trace element prebaked anodes includes the following steps:

[0007] S1. Before the production of petroleum coke raw material batching, the production control system automatically selects and batches materials based on the existing petroleum coke raw material inventory and the system's pre-stored prebaked anode default technical standards, recommends the first batching scheme, and obtains the first comprehensive index of trace elements of calcined petroleum coke that can be obtained according to the first batching scheme and the default calcination program, and then proceeds to step S2.

[0008] S2, the system determines whether the range of trace element M in the first comprehensive trace element index of calcined petroleum coke mentioned in step S1 meets the latest control standard of trace element M newly input by the system user. If the range of trace element M meets the latest control standard, the first batching scheme and the default calcination program are selected as the production execution program and the system proceeds to step S6; otherwise, the system proceeds to step S3.

[0009] Wherein, the trace element M is a non-S metallic element or a non-metallic element;

[0010] S3, the system determines whether there is a pre-marked low-M calcination program among the candidate calcination programs. If there is a pre-marked low-M calcination program, the system obtains the second comprehensive index of trace elements of calcined petroleum coke that can be obtained according to the first batching scheme and the low-M calcination program, and proceeds to step S4.

[0011] S4, the system determines whether the range of trace element M in the comprehensive trace element index of the second calcined petroleum coke mentioned in step S3 meets the latest control standard of trace element M newly input by the system user. If the range of trace element M meets the latest control standard, the first batching scheme and the low M calcination program are selected as the production execution program and the system proceeds to step S6; otherwise, the system proceeds to step S5.

[0012] S5. Adjust the proportion of petroleum coke raw materials according to the goal of reducing the trace element content of the product, obtain and compare trace elements until the range of trace element M in the comprehensive trace element index of calcined petroleum coke meets the latest control standards, and determine the production execution procedure.

[0013] S6, execute the production process;

[0014] S7. Conduct trace element testing on calcined petroleum coke to determine whether each trace element, including trace element M, meets the technical standards. If the trace elements do not meet the technical standards, adjust the batching scheme and / or calcination procedure.

[0015] Furthermore, the non-S metallic or non-metallic element is at least one of Si, V, Ti, Fe, Ni, Na, and Mn.

[0016] Furthermore, step S5 specifically includes:

[0017] S5-1, Adjust the proportion of petroleum coke raw material in the first batching scheme according to the goal of reducing the trace element content of the product, and obtain an improved batching scheme, then proceed to step S5-2.

[0018] S5-2, replace the first ingredient scheme in step S1 with the improved ingredient scheme obtained in step S5-1, and repeat the process of obtaining and comparing trace elements from step S1 to step S4.

[0019] Furthermore, the adjustment of the petroleum coke raw material ratio in step S5 to reduce the trace element content of the product is achieved by increasing the proportion of high-grade petroleum coke raw materials and / or pitch coke raw materials in the petroleum coke raw materials.

[0020] Furthermore, in step S5, the proportion of petroleum coke raw materials is adjusted once or multiple times based on the comparison results of trace elements.

[0021] Optionally, the default calcination program is the preferred calcination program when the comprehensive trace element index of the calcined petroleum coke is superior to that of the candidate calcination programs.

[0022] Optionally, the default calcination program is the preferred calcination program where at least one of the following indicators—S content, resistivity, and volatile matter—is superior to the candidate calcination programs.

[0023] Optionally, the default calcination program is the preferred calcination program that is superior to the candidate calcination programs after comprehensive evaluation of the comprehensive indicators of trace elements in the calcined petroleum coke and at least one indicator selected from S content, resistivity, and volatile matter.

[0024] Furthermore, in production, the low-M calcination process is pre-marked based on the trace element test results after the production process is executed using the candidate calcination process.

[0025] Furthermore, both the default calcination program and the candidate calcination program include multiple holding temperature ranges, holding time ranges corresponding to the multiple holding temperature ranges, and heating rate ranges for each range.

[0026] Beneficial effects:

[0027] Prebaked anode calcined petroleum coke is a major product category currently in production. According to the method for preparing low-trace element prebaked anode calcined petroleum coke provided by this invention, in daily production, the main raw material ratio schemes and calcination procedures used and verified in the production control system are classified and marked to meet the enterprise's raw material source / inventory, cost control requirements, and general technical standards of the target product (such as comprehensive trace element indicators). In particular, based on the product's trace element testing (or prediction) results, calcination procedures that have a significant control effect on specific trace elements M (Si, V, Ti, Fe, Ni, Na, Mn, and other non-S elements) are marked. Therefore, when the technical standard of a specific trace element M is improved, the changed technical standard can be precisely controlled by selecting and calling the calcination procedure, without immediately and significantly increasing the proportion of high-grade petroleum coke raw materials. This allows for meeting the user's technical requirements while ensuring controllable production costs for the calcined petroleum coke product. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the implementation principle of the method of the present invention.

[0029] Figure 2 Example 1 illustrates the basis for determining the priority levels of the default calcination program and candidate calcination programs in the method of the present invention.

[0030] Figure 3 Example 2 illustrates the basis for determining the priority levels of the default calcination program and candidate calcination programs in the method of the present invention.

[0031] Figure 4 Example 3 illustrates the basis for determining the priority levels of the default calcination program and candidate calcination programs in the method of the present invention. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Example 1

[0034] Calcinated petroleum coke for prebaked anodes is a major product category currently in production. This embodiment takes the production of calcined petroleum coke for prebaked anodes as an example, combined with... Figure 1 The implementation principle shown introduces a method for preparing calcined petroleum coke for low-trace element prebaked anodes, including the following steps:

[0035] S1. Before the production of petroleum coke raw material batching, the production control system automatically selects and batches materials based on the existing petroleum coke raw material inventory and the system's pre-stored default technical standards for prebaked anodes, recommends the first batching scheme, and obtains the first comprehensive index of trace elements in the calcined petroleum coke that can be obtained based on the first batching scheme and the default calcination program.

[0036] Before end users raise the control standards for one or more (usually one or two, such as V and / or Fe) of specific trace elements M (generally Si, V, Ti, Fe, Ni, Na or Mn) other than S, enterprises default to executing production programs according to the batching scheme and preferred calcination procedure that meet industry standards. By pre-entering production verification data or through theoretical calculations, the production control system can automatically select and batch materials based on the existing petroleum coke raw material inventory and the system's pre-stored default technical standards for prebaked anodes, recommend the preferred batching scheme, and read or calculate the comprehensive trace element index of calcined petroleum coke that can be obtained according to the preferred batching scheme and preferred calcination procedure.

[0037] To illustrate the above basic principles, Figures 2 to 4 Several methods for determining the priority of default calcination programs and candidate calcination programs are introduced with examples.

[0038] exist Figure 2In this study, the comprehensive trace element index of calcined petroleum coke is used as the basis for determination. Therefore, the default calcination program is the preferred calcination program, which has a better comprehensive trace element index than the candidate calcination programs.

[0039] exist Figure 3 In this study, the comprehensive index of trace elements in calcined petroleum coke was not directly used as the basis for determination. Instead, at least one of the following indices was used as the basis: S content, resistivity, and volatile matter. Therefore, the default calcination procedure is the preferred calcination procedure, which is the one in which at least one of the S content, resistivity, and volatile matter indices is superior to the candidate calcination procedures.

[0040] Typically, the default calcination procedure should be the one that yields the best results from all aspects of verification. Figure 4 The preferred calcination procedure is determined by a comprehensive evaluation of the trace element index of calcined petroleum coke and at least one index selected from S content, resistivity, and volatile matter (which may be a combination of all the indexes). Therefore, the default calcination procedure is the preferred calcination procedure that is superior to the candidate calcination procedures after a comprehensive evaluation of the trace element index of calcined petroleum coke and at least one index selected from S content, resistivity, and volatile matter.

[0041] On the other hand, by classifying and marking the main raw material ratio schemes and calcination procedures used in the production of prebaked anodes for calcined petroleum coke production—which meet the company's raw material sourcing / inventory, cost control requirements, and target product industry standards—in the production control system during daily production, different calcination procedures can be invoked based on different technical requirements. Therefore, pre-marking the "low-M calcination procedure" (M being the specific trace element requiring higher control standards mentioned earlier) in the system provides the conditions for precisely controlling the content of the specific trace element M. Therefore, in production, it is preferable to pre-mark the low-M calcination procedure based on the trace element test results after executing the production process using multiple candidate calcination procedures.

[0042] The method in this embodiment specifically targets trace elements and excludes sulfur because the production of petroleum coke after low-saturation calcination already has mature production standards and specialized execution response procedures, and generally no longer requires precise control according to the method in this embodiment.

[0043] Next, we proceed from step S1 to step S2.

[0044] S2, the system determines whether the range of trace element M in the comprehensive trace element index of the first calcined petroleum coke mentioned in step S1 meets the latest control standard of trace element M newly input by the system user. If the range of trace element M meets the latest control standard, the first batching scheme and the default calcination program are selected as the production execution program and the system proceeds to step S6 (i.e., execute the production program). Otherwise, the system proceeds to step S3.

[0045] S3, the system determines whether there is a pre-marked low-M calcination program among the candidate calcination programs. If there is a pre-marked low-M calcination program, the system obtains the second comprehensive index of trace elements of calcined petroleum coke that can be obtained according to the first batching scheme and the low-M calcination program, and proceeds to step S4.

[0046] S4, the system determines whether the range of trace element M in the comprehensive trace element index of the second calcined petroleum coke mentioned in step S3 meets the latest control standard of trace element M newly input by the system user. If the range of trace element M meets the latest control standard, the first batching scheme and the low M calcination program are selected as the production execution program and the system proceeds to step S6 (i.e., execute the production program). Otherwise, the system proceeds to step S5.

[0047] S5. Adjust the proportion of petroleum coke raw materials according to the goal of reducing the trace element content of the product, obtain and compare trace elements, until the range of trace element M in the comprehensive trace element index of calcined petroleum coke meets the latest control standards, and determine the production execution procedure.

[0048] As is known to those skilled in the art, high-grade petroleum coke or specially blended pitch coke in petroleum coke raw materials are crucial for ensuring trace element content. Therefore, adjusting the proportion of petroleum coke raw materials in this step to reduce the trace element content of the product is generally achieved by increasing the proportion of high-grade petroleum coke and / or pitch coke raw materials, for example, by increasing the mass proportion of high-grade petroleum coke or pitch coke by 5-10%. It is easy to understand that the term "high-grade petroleum coke raw material" in this invention refers to a higher grade of petroleum coke raw material that is more conducive to controlling trace element content compared to the petroleum coke raw material base (the raw material that accounts for the main proportion). Based on its comparative significance, it does not specifically refer to any particular type or grade of raw material.

[0049] Although there may be other means of adjusting the petroleum coke feedstock formulation in step S5, based on the spirit of this invention, step S5 is preferably performed according to the following steps:

[0050] S5-1, Adjust the proportion of petroleum coke raw material in the first batching scheme according to the goal of reducing the trace element content of the product, and obtain an improved batching scheme, then proceed to step S5-2.

[0051] S5-2, replace the first ingredient scheme in step S1 with the improved ingredient scheme obtained in step S5-1, and repeat the process of obtaining and comparing trace elements from step S1 to step S4.

[0052] Depending on the magnitude of the adjustment and the real-time progress, the adjustment of the petroleum coke feedstock ratio in step S5 above may be performed once or multiple times, depending on the comparison results of trace elements.

[0053] S6, execute the production process.

[0054] S7. Conduct trace element testing on the calcined petroleum coke to determine whether each trace element, including trace element M, meets the technical standards. If the trace elements do not meet the technical standards, adjust the batching scheme and / or calcination procedure. Process adjustments when theoretical results differ from production verification results can be carried out according to current operating standards or contingency plans, and will not be elaborated further.

[0055] It is easy to understand that the comprehensive index of trace elements in the calcined petroleum coke mentioned in the above steps of this embodiment meets the industry standard, because the default calcination program and the candidate calcination program in this embodiment are obviously qualified production programs (production programs that meet the general industry standard before the user proposes the latest control standard for trace element M).

[0056] As is known to those skilled in the art, the calcination process is a crucial factor in determining the various technical indicators of the calcined petroleum coke. To ensure the precise controllability of each calcination process, the default and candidate calcination processes used in this embodiment generally include multiple holding temperature ranges, corresponding holding time ranges, and heating rate ranges for each range. These ranges include at least one pre-calcination stage and at least one final calcination stage. The parameter ranges are determined by a certain period or a certain number of production verifications and are adjustable parameters. When more than one type of trace element M requires precise control and there is also more than one corresponding low-M calcination process, a new low-M calcination process can be obtained by deduplicating the information of the multiple holding temperature ranges, corresponding holding time ranges, and heating rate ranges for each low-M calcination process. The production control system or production manager can also automatically or manually adjust the existing candidate calcination process or the aforementioned new low-M calcination process before calling it and conducting production verification.

[0057] In summary, the method for preparing calcined petroleum coke for prebaked anodes with low trace element content provided in this embodiment allows for the classification and marking of the main raw material ratio schemes and calcination procedures used in the production control system to meet the requirements of raw material sourcing / inventory, cost control, and general technical standards (such as comprehensive trace element indicators) of the target product. In particular, based on the trace element test (or prediction) results of the product, calcination procedures that have a significant control effect on specific trace elements M (Si, V, Ti, Fe, Ni, Na, Mn) can be marked. Thus, when the technical standard of specific trace element M is improved, the changed technical standard can be precisely controlled by selecting and calling the calcination procedure without immediately and significantly increasing the proportion of high-grade petroleum coke raw materials. This ensures that the technical requirements proposed by users can be met while maintaining controllable production costs for the calcined petroleum coke product.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing calcined petroleum coke for low-trace element prebaked anodes, characterized in that, Includes the following steps: S1. Before the production of petroleum coke raw material batching, the production control system automatically selects and batches materials based on the existing petroleum coke raw material inventory and the system's pre-stored prebaked anode default technical standards, recommends the first batching scheme, and obtains the first comprehensive index of trace elements of calcined petroleum coke that can be obtained according to the first batching scheme and the default calcination program, and then proceeds to step S2. S2, the system determines whether the range of trace element M in the first comprehensive trace element index of calcined petroleum coke mentioned in step S1 meets the latest control standard of trace element M newly input by the system user. If the range of trace element M meets the latest control standard, the first batching scheme and the default calcination program are selected as the production execution program and the system proceeds to step S6; otherwise, the system proceeds to step S3. Wherein, the trace element M is a non-S metallic element or a non-metallic element; S3, the system determines whether there is a pre-marked low-M calcination program among the candidate calcination programs. If there is a pre-marked low-M calcination program, the system obtains the second comprehensive index of trace elements of calcined petroleum coke that can be obtained according to the first batching scheme and the low-M calcination program, and proceeds to step S4. S4, the system determines whether the range of trace element M in the comprehensive trace element index of the second calcined petroleum coke mentioned in step S3 meets the latest control standard of trace element M newly input by the system user. If the range of trace element M meets the latest control standard, the first batching scheme and the low M calcination program are selected as the production execution program and the system proceeds to step S6; otherwise, the system proceeds to step S5. S5. Adjust the proportion of petroleum coke raw materials according to the goal of reducing the trace element content of the product, obtain and compare trace elements until the range of trace element M in the comprehensive trace element index of calcined petroleum coke meets the latest control standards, and determine the production execution procedure. S6, execute the production process; S7. Conduct trace element testing on calcined petroleum coke to determine whether each trace element, including trace element M, meets the technical standards. If the trace elements do not meet the technical standards, adjust the batching scheme and / or calcination procedure.

2. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, The non-S metallic or non-metallic element is at least one of Si, V, Ti, Fe, Ni, Na, and Mn.

3. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, Step S5 specifically includes: S5-1, Adjust the proportion of petroleum coke raw material in the first batching scheme according to the goal of reducing the trace element content of the product, and obtain an improved batching scheme, then proceed to step S5-2. S5-2, replace the first ingredient scheme in step S1 with the improved ingredient scheme obtained in step S5-1, and repeat the process of obtaining and comparing trace elements from step S1 to step S4.

4. A method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1 or 3, characterized in that, The adjustment of the petroleum coke raw material ratio in step S5 to reduce the trace element content of the product is achieved by increasing the proportion of high-grade petroleum coke raw materials and / or pitch coke raw materials in the petroleum coke raw materials.

5. A method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1 or 3, characterized in that, In step S5, the proportion of petroleum coke raw materials is adjusted once or multiple times based on the comparison results of trace elements.

6. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, The default calcination program is the preferred calcination program, which has better comprehensive trace element indicators than the candidate calcination programs after calcination.

7. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, The default calcination program is the preferred calcination program whose S content, resistivity, and volatile matter content are superior to the candidate calcination programs.

8. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, The default calcination program is the preferred calcination program that is superior to the candidate calcination programs after comprehensive evaluation of the comprehensive index of trace elements in the calcined petroleum coke and at least one index selected from S content index, resistivity index, and volatile matter index.

9. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, In production, the low-M calcination process is pre-marked based on the trace element test results after the production process is executed using the candidate calcination process.

10. The method for preparing calcined petroleum coke for low-trace element prebaked anodes according to claim 1, characterized in that, Both the default calcination program and the candidate calcination program include multiple holding temperature ranges, holding time ranges corresponding to the multiple holding temperature ranges, and heating rate ranges for each range.

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