Coking plant steam balancing method based on AutoCAD

Abstract

The invention relates to the technical field of coking plant steam balance, in particular to a coking plant steam balance method based on AutoCAD. S1, establishing a steam balance system; s2, constructing a steam user object, a supply source object and a pipeline object; s3, user object information is summarized based on steam user objects created in AutoCAD, and a user table is created; s4, summarizing supply source object information based on steam supply source objects created in AutoCAD and creating a supply source table; s5, pipeline object information is summarized based on pipeline objects created in AutoCAD, and a pipeline table is created; s6, creating a node table based on the pipeline table, the user table and the supply source table; s7, creating a working condition pipeline table based on the working condition summary table and the node table, and obtaining the flow of each pipeline in each working condition through calculation; s8, on the basis of the working condition pipeline table, the pipe diameter of each pipeline is calculated, and a pipeline pipe diameter table is created; and S9, obtaining the setting condition of the reducing pipe based on the node table and the pipeline diameter table, and creating a reducing pipe table. The quality and efficiency of steam balance work are improved, and the product quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steam balance in a coking plant, in particular to a steam balance method for a coking plant based on AutoCAD. Background Art

[0002] Steam balance in coking plants directly impacts steam system installation plans, equipment and piping selection, and investment, indirectly influencing steam system operating costs, energy conservation, environmental protection, and green and low-carbon performance. Scientific steam balance significantly increases corporate profitability, environmental protection, and social benefits. Many companies have explored and researched steam balance, its modeling, and simulation optimization.

[0003] Steam balancing is a bottom-up process, starting with the most remote steam users. This process is then layered, taking into account the possibility of simultaneous operation, to determine various matching steam supply sources. This process involves varying supply source flow rates under different operating conditions, varying flow rates within each pipeline network, and resulting in different calculated pipe diameters. Traditional manual balancing is not only labor-intensive but also prone to errors.

[0004] Steam is a high-priced, energy-intensive working fluid in coking plants. Its use, supply, and management directly impact the plant's profitability and energy consumption. Scientifically and rationally determining steam supply plans for various possible operating conditions is a key task in steam balancing. Being overly conservative can lead to an increase in equipment quantity or capacity, unnecessary construction investment, and unnecessary steam emissions during operation, resulting in waste and causing noise and heat pollution. Being overly aggressive can cause the steam system's backup equipment to operate for extended periods, seriously impacting system safety and reliability. It can even lead to insufficient heat supply to equipment directly involved in product production, impacting both output and quality.

[0005] As refined management concepts prevail across industries, many coking plants are placing higher demands on steam system installation and operational management, based on practical production practices. For example, they are leveraging advanced control technologies to achieve precise steam supply and avoid waste. Another example is establishing expert systems to guide production operations and compensate for deficiencies in operator quality and experience.

[0006] There are commercially available steam balance software, such as Aspen Utility Planner. However, as general-purpose commercial software, it lacks customizable two-way communication with charting software. Users must manually enter information into the charting software, manually enter information into the steam balance software, automatically calculate the steam balance, and then manually enter the results into the charting software. Summary of the Invention

[0007] In order to overcome the shortcomings of the existing technology, the present invention provides a coking plant steam balance method based on AutoCAD, which improves the quality and efficiency of steam balance work and improves product quality.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A coking plant steam balance method based on AutoCAD specifically includes the following steps:

[0010] S1: Establish a steam balance system. The steam balance system consists of users, supply sources, and pipelines connecting users and supply sources. Users and supply sources are nodes, and pipelines are channels connecting nodes, which is a topological structure.

[0011] S2: Construct steam user objects, supply source objects and pipeline objects based on attributed blocks in AutoCAD.

[0012] The steam user object includes the user name, steam usage and working system attribute information.

[0013] The supply source object includes the supply source name, supply capacity and work system attribute information.

[0014] The pipeline object includes the connection start point, connection end point, start point associated object and end point associated object attribute information. The flow direction of the medium in the pipeline is from the pipeline start point to the pipeline end point.

[0015] S3: Based on the steam user objects created in AutoCAD, user object information is aggregated and a user table is created. The user table is created by aggregating AutoCAD space user objects and their information.

[0016] S4: Based on the steam supply source objects created in AutoCAD, the supply source object information is summarized and a supply source table is created. The supply source table is created by summarizing the AutoCAD space supply source objects and their information.

[0017] S5: Based on the pipeline objects created in AutoCAD, pipeline object information is summarized and a pipeline table is created. The pipeline table is created by summarizing the AutoCAD spatial pipeline objects and their information.

[0018] S6: Create a node table based on the pipeline table, user table and supply source table.

[0019] The node table includes the attribute information of mainstream input pipelines, tributary input pipelines, mainstream output pipelines and tributary output pipelines, and is formed by summarizing user nodes, supply source nodes, pipeline start and end nodes; first, the pipeline start and end points in the pipeline table are traversed to obtain a node list, and then based on the spatial layout and connection of pipeline objects in AutoCAD, the mainstream input pipeline, tributary input pipeline, mainstream output pipeline and tributary output pipeline information of each node are obtained; the mainstream input pipeline and mainstream output pipeline of each node must be present, and the tributary input pipeline and tributary output pipeline may exist, but not at the same time.

[0020] S7: Create a working condition pipeline table based on the working condition summary table and the node table, and obtain the flow of each pipeline in each working condition through calculation.

[0021] Pipeline flow calculation includes iterative calculation:

[0022] When traversing the working condition pipeline point for the first time, if its end point is associated with a user, the user flow is obtained as the pipeline flow; if its starting point is associated with a supply source, the supply source flow is obtained as the pipeline flow;

[0023] The node table is traversed in a loop. If only one of the main stream input pipeline flow, tributary input pipeline flow, main stream output pipeline flow, or tributary output pipeline flow of a node is unknown, the sum of the node inflow and outflow is used to solve the problem, and the result is written into the working condition pipeline table.

[0024] Until the pipeline flow required for the working condition is obtained in the working condition pipeline table, the pipeline flow associated with the supply source in the state to be determined is the flow of the supply source.

[0025] Pipeline flow calculation involves using matrix theory to build a matrix and solve:

[0026] First, sort out the variables and traverse the working pipeline points. If its end point is associated with a user, the user flow is obtained as the pipeline flow; if its start point is associated with a supply source, the supply source flow is obtained as the pipeline flow; the remaining pipeline flows are used as variables, and a matrix is established for solution. At this time, the pipeline flow associated with the supply source in the state to be determined is the supply volume of the supply source.

[0027] S8: Based on the working condition pipeline table, calculate the diameter of each pipeline and create a pipeline diameter table.

[0028] Pipeline diameter calculation:

[0029]

[0030] Where: D n is the inner diameter of the pipe, mm;

[0031] Q m is the mass flow rate, t / h;

[0032] ρ is steam density, kg / m 3 ;

[0033] v is the steam velocity, m / s.

[0034] S9: Based on the node table and the pipeline diameter table, the reducer setting information is obtained and a reducer table is created. The reducer table stores the pipeline information calculated by the system to which the reducer needs to be added.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] In the field of plant design, 3D design concepts are becoming increasingly popular. However, in actual design operations, 3D design models still need to be converted into 2D drawings as part of the final product. However, for steam balance design, which combines physical and logical elements, 2D drawing software, such as AutoCAD, remains the best choice. Therefore, this article proposes developing a steam balance system based on AutoCAD.

[0037] The present invention is based on digital concepts and technologies. By using attributed blocks in AutoCAD to construct user, supply source and connection pipeline objects, the objects contain drawing and data information. After performing calculations and other operations on the objects and their attributes, the results are generated into the drawings, thereby realizing the management of drawings and data.

[0038] The present invention develops a steam balance system based on the drawing software AutoCAD. Compared with the commercial software currently available for steam balance, only information needs to be manually entered into the drawing software AutoCAD, and the rest of the process is completed automatically.

[0039] The present invention significantly improves both quality and efficiency. First, it demonstrates significant advantages in computational efficiency: While a traditional calculator might take 5-10 minutes to calculate the flow rate and pipe diameter of a complex node, the present invention completes the task in just seconds. Furthermore, the present invention can batch process hundreds of nodes and pipe segments, while traditional calculators can only calculate them one by one. Second, in terms of computational accuracy, traditional calculators can suffer from errors as high as 5%-10% due to human input errors and the limitations of complex formula processing. However, the present invention, through its built-in algorithms and verification mechanisms, can control the error rate to 0.1%-0.5%. Furthermore, when processing complex fluid dynamics formulas (such as the Darcy drag formula), its accuracy is 20%-30% higher than manual calculations. Regarding data management and recording, the present invention automatically saves the design process and calculation results and supports exporting them in multiple formats (such as Excel and PDF). Traditional calculators are unable to save data, resulting in a near-100% data loss rate. Furthermore, the present invention's version control function allows for the tracing of design changes, ensuring auditability. In comparison, tracing design changes using traditional methods is extremely difficult, with error rates as high as 30%-50%. User experience and ease of use have also been greatly improved: Traditional calculators require users to spend weeks learning complex formulas and calculation methods, but the present invention, with its intuitive user interface and built-in tutorials, allows users to master basic operations within 1-2 days. The present invention's automation function also reduces the number of user steps required to complete a complex calculation task, from 20-30 steps in the traditional method to 5-10 steps. In terms of cost-effectiveness, the traditional method requires a large amount of manpower for repetitive calculations, with labor costs accounting for 30%-40% of the total design cost. However, the present invention's automation function can reduce labor costs to 10%-15%. Furthermore, the traditional method can cause design rework costs due to calculation errors as high as 20%-30%, while the present invention reduces rework costs to 2%-5% by reducing errors. Finally, in terms of design optimization and flexibility, the present invention allows users to quickly adjust parameters (such as pipe diameter, flow rate, etc.) and view the impact on the system in real time. While traditional methods may take 10-15 minutes to recalculate each time a parameter is adjusted, the present invention can be completed in a few seconds. In addition, the present invention can handle complex pipe network systems and adapt to different working conditions. Its design flexibility is 50%-70% higher than that of traditional methods. In summary, through these quantitative data, it can be clearly seen that the use of the developed present invention in the medium balance work of plant design not only significantly improves the calculation efficiency and accuracy, but also reduces costs and error rates, while improving user experience and design flexibility. It is an indispensable tool in modern plant design.

[0040] This invention establishes a steam balancing system for the coking plant's steam pipeline network. This system is used to achieve static steam balancing, determine steam supply plans, and select equipment and pipeline types, thereby improving the quality and efficiency of steam balancing. It also provides guidance for dynamically determining operating parameters during operation, empowering engineering design, achieving both quality and efficiency improvements, improving product quality, and contributing to the high-quality development of the coking industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is the spatial distribution diagram of the steam system of the present invention. DETAILED DESCRIPTION

[0042] The present invention discloses a coking plant steam balance method based on AutoCAD. Those skilled in the art can refer to the contents of this document and appropriately improve the process parameters to achieve the desired results. It is particularly important to note that all similar substitutions and modifications obvious to those skilled in the art are considered to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein to implement and apply the technology of the present invention without departing from the content, spirit, and scope of the present invention.

[0043] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0044] A coking plant steam balance method based on AutoCAD, the specific technical solution is as follows:

[0045] 1. Overall conception:

[0046] The steam balance system consists of users, supply sources, and connecting pipelines. Users and supply sources can be abstracted as nodes independent of mass and volume, and pipelines can be abstracted as channels connecting nodes. This system is a typical topological structure.

[0047] In the field of plant design, the concept of 3D design is becoming increasingly popular. However, in actual design operations, due to the requirements of existing administrative management systems such as approval and review, 3D design models still need to be converted into 2D drawings as part of the final product. However, for steam balance design, which combines physical and logical design, 2D drawing software such as AutoCAD remains the best choice. Therefore, this paper proposes the development of a steam balance system based on AutoCAD.

[0048] Based on digital concepts and technologies, users, supply sources and connecting pipeline objects are constructed using attributed blocks in AutoCAD. The objects contain drawing and data information. After performing calculations and other operations on the objects and their attributes, the results are generated into the drawings, thus realizing the management of drawings and data.

[0049] 2. Basic objects

[0050] (1) Physical properties and engineering material objects

[0051] Establish a basic data table to store information such as the density, economic flow rate of saturated steam and superheated steam at different pressures and temperatures, and the pipe specifications, outer diameters, and wall thickness used for the pipe material grades that are compatible with the pressure and temperature.

[0052] (2) Drawing objects

[0053] In this system, a user object is set to represent a steam user. In AutoCAD, this object is represented by a block with attributes, which is reflected as a node in the topological structure. This object includes the user name, steam usage, and work system attribute information.

[0054] In this system, the supply source object is set to represent the steam supply source. In AutoCAD, this object is represented by a block with attributes, which is reflected as a node in the topological structure. This object includes the supply source name, supply capacity, and work system attribute information.

[0055] In this system, a connection object is set to represent the steam pipeline. In AutoCAD, this object is represented by a block with attributes, which represents the topological structure of the connection. The object includes the connection start point, the connection end point, the attribute information of the object associated with the start point, and the attribute information of the object associated with the end point. The flow direction of the medium in the pipeline is from the pipeline start point to the pipeline end point.

[0056] (3) Report object

[0057] The user table is formed by summarizing AutoCAD space user objects and their information.

[0058] The supply source table is formed by summarizing the AutoCAD space supply source objects and their information.

[0059] The pipeline table is formed by summarizing the AutoCAD spatial pipeline objects and their information.

[0060] The node table contains the attributes of the main flow input pipeline, tributary input pipeline, main flow output pipeline, and tributary output pipeline. This table is created by summarizing user nodes, supply source nodes, pipeline start and end nodes. First, the pipeline start and end points in the pipeline table are traversed to obtain a node list. Then, based on the spatial layout and connections of the pipeline objects in AutoCAD, the main flow input pipeline, tributary input pipeline, main flow output pipeline, and tributary output pipeline information for each node are obtained. For each node, the main flow input pipeline and main flow output pipeline must be present, and tributary input pipelines and tributary output pipelines may be present, but not both.

[0061] The working condition summary table collects characteristic descriptions, working condition properties, and known flow information of users and supply sources in each working condition.

[0062] The working condition pipeline table is used by the system to establish the flow model of each pipeline and calculate the flow of each pipeline.

[0063] The pipeline diameter table is used by the system to calculate the maximum flow rate of the pipeline under various working conditions and calculate the pipe diameter.

[0064] The reducer table is used to store pipeline information where reducers need to be added, as calculated by the system.

[0065] (4) Template object

[0066] Typical user and supplier information lists. Users simply enter keywords describing user and supplier names in the list box. The system automatically filters and selects the information for the user. After selection, the information is assigned to the current user or supplier object for modification and confirmation.

[0067] 3. Functions and implementation ideas

[0068] (1) Creation of drawing objects and their reports

[0069] When creating a user object in the system, the user needs to enter attribute information. When the creation is completed, the system will synchronously generate the object's drawing and automatically generate the associated node information.

[0070] The user creates a supply source object in the system and inputs attribute information when creating it. When the creation is completed, the system synchronously generates the object's drawing and automatically generates the associated node information.

[0071] When a user creates a pipeline object in the system, the system first creates a node as the starting node or end node of the object, or specifies an existing node as the starting node or end node of the object, and then obtains the user or supplier associated with the starting node and the end node. When the creation is completed, the object drawing is generated synchronously.

[0072] The system automatically creates user tables, supply source tables, pipeline tables, and node tables.

[0073] (2) Working condition setting

[0074] The system creates a working condition table to collect working condition information customized by system users. Each working condition's characteristics and the flow rate of each user and supply source within that condition must be specified. A specific supply source's flow rate must also be designated as requested. For supply sources whose flow rates are not requested, if the system user does not enter a flow rate, the system automatically assigns a representative flow rate.

[0075] The setting of operating conditions should be comprehensive. Beyond the baseline operating conditions, every possible operating condition should be considered. For example, if there are periodic intermittent users, separate operating conditions should be considered based on the possibility of simultaneous operation. For another example, if there is a user with high steam consumption but occasional operation, the capacity of the supply source in the pending state should be verified to ensure it meets the demand. The user should consider whether to add other supply sources, reduce supply to some users, or even suspend supply.

[0076] (3) Supply calculation

[0077] The system creates a working condition pipeline table based on the node table and working condition table, and then starts pipeline flow calculation based on this table. The calculation process has the following two methods.

[0078] One is iterative calculation. The detailed process is as follows: first traverse the working condition pipeline point. If its end point is associated with a user, the user flow is obtained as the pipeline flow; if its start point is associated with a supply source, the supply source flow is obtained as the pipeline flow. The node table is traversed in a loop. If only one of the main input pipeline flow, tributary input pipeline flow, main output pipeline flow, or tributary output pipeline flow of a node is unknown, the sum of the node inflow and outflow is zero to solve the problem, and the result is written to the working condition pipeline table. Until the pipeline flow required for the working condition in the working condition pipeline table is obtained, the pipeline flow associated with the supply source in the state to be calculated is the supply source flow.

[0079] Another method is to use matrix theory to build a matrix and solve it. First, sort out the variables. Traverse the working pipeline points. If the end point is associated with a user, obtain the user flow as the pipeline flow; if the start point is associated with a supply source, obtain the supply source flow as the pipeline flow. Use the remaining pipeline flows as variables and build a matrix to solve. At this point, the pipeline flow associated with the supply source in the state to be solved is the supply volume of the supply source. This method also has the following advantages: it can check the quality of the known conditions, such as using matrix correlation theory to determine whether there is a unique solution.

[0080] The calculated supply quantity and capacity of the supply source are then compared to determine the rationality and compliance of the equipment installation plan. If the supply capacity is exceeded, the system will issue a reminder.

[0081] The system automatically determines the flow direction based on the flow direction reflected by each pipeline node in the pipeline table and the flow rate of the pipeline in each working condition, and automatically adds arrows indicating the flow direction in the drawing.

[0082] (3) Calculation of pipeline diameter

[0083] After obtaining the maximum flow rate based on the calculated flow rate of each pipeline in each working condition, the system automatically calculates the pipe diameter using formula (1) based on the economic flow rate theory. The system then automatically writes the pipe diameter information into the drawing.

[0084]

[0085] Where D n ——Inner diameter of the pipe, mm;

[0086] Q m ——Mass flow rate, t / h;

[0087] ρ——steam density, kg / m 3 ;

[0088] v——steam velocity, m / s;

[0089] The system automatically writes the calculated pipe diameter information into the drawing.

[0090] Example:

[0091] 1. Basic Information of the Case

[0092] This embodiment is a preferred embodiment of the present invention. Taking the steam system of a coking and coke oven gas deep processing project in Hebei as an example, it is simplified. After simplification, there are six users and two supply sources. Their spatial distribution is detailed in Figure 1 In this case, the steam is 0.6MPa saturated steam with a density of 3.667kg / m 3 Consider that the economic flow rate when transporting this steam is 25m / s.

[0093] 2. User and supply source objects and information

[0094] The user creates user and provider objects in AutoCAD and enters attribute information.

[0095] After all user and supply source objects are created, the system automatically generates the user table and supply source table, see Table 1 and Table 2 for details.

[0096] Table 1 User table

[0097]

[0098]

[0099] Table 2 Supply source table

[0100] Supply Source Name Work system Supply capacity (t / h) Annual working hours (h) Associated Nodes Supply Source A External pipeline supply 10 8760 N7 Supply Source B Waste heat boiler supplies steam 5 8000 N8

[0101] 3. Pipeline objects and information

[0102] Based on the spatial distribution of users and supply sources in AutoCAD, combined with factory processes and road layout, users create main pipelines and branch pipelines to connect users and supply sources.

[0103] After all pipeline objects are created, the system automatically generates a pipeline table, see Table 3 for details.

[0104] Table 3 Pipeline table

[0105] Serial number Connection starting point Connection end point Starting point associated object Endpoint associated object 1 N7 N13 Supply Source A -- 2 N13 N10 -- -- 3 N10 N14 -- -- 4 N14 N1 -- User A 5 N13 N12 -- -- 6 N12 N11 -- -- 7 N11 N4 -- User D 8 N12 N6 -- User F 9 N11 N5 -- User E 10 N10 N9 -- -- 11 N9 N2 -- User B 12 N9 N3 -- User C 13 N14 N8 -- Supply Source B

[0106] 4. Node Information

[0107] The node table in this case is detailed in Table 4.

[0108] Table 4 Node table

[0109] Serial number Node number Mainstream input pipeline Branch input pipeline Mainstream output pipeline Branch output pipeline 1 N1 N14N1 -- User A -- 2 N2 N9N2 -- User B -- 3 N3 N9N3 -- User C -- 4 N4 N11N4 -- User D -- 5 N5 N11N5 -- User E -- 6 N6 N12N6 -- User F -- 7 N7 Supply Source A -- N7N13 -- 8 N8 N14N8 -- Supply Source B -- 9 N9 N10N9 -- N9N2 N9N3 10 N10 N13N10 -- N10N14 N10N9 11 N11 N12N11 -- N11N4 N11N5 12 N12 N13N12 -- N12N11 N12N6 13 N13 N7N13 -- N13N10 N13N12 14 N14 N10N14 -- N14N1 N14N8

[0110] 5. Working condition information

[0111] The detailed information of various working conditions in this case is shown in Table 5. Since supply source B operates 8000 hours per year, its downtime needs to be considered.

[0112] Table 5 Working condition summary

[0113]

[0114]

[0115] 6. Calculation of pipeline flow under working conditions

[0116] Table 6 details the pipeline flow rates for each operating condition. In operating conditions 4, 9, 10, and 11, if the calculated supply from Source A exceeds its capacity, the system will issue a warning. Increasing Source A's capacity can be proposed. If this is not feasible, the final steam supply plan will be determined by comprehensively considering the safety, economics, and affordability of reducing or suspending supply to end users.

[0117] Table 6 Working Condition Pipeline Table

[0118]

[0119]

[0120] Note 1 : The negative sign indicates that the actual flow direction is opposite to the default flow direction from the start point to the end point of the pipeline.

[0121] 7. Calculation of pipeline diameter

[0122] The diameters of the pipelines in this case are detailed in Table 7.

[0123] Table 7 Pipeline diameter table

[0124]

[0125] 8. Variable diameter information

[0126] The reducers required in this case are detailed in Table 8.

[0127] Table 8 Reducer Table

[0128]

[0129] The present invention is based on digital concepts and technologies. By using attributed blocks in AutoCAD to construct user, supply source and connection pipeline objects, the objects contain drawing and data information. After performing calculations and other operations on the objects and their attributes, the results are generated into the drawings, thereby realizing the management of drawings and data.

[0130] The present invention develops a steam balance system based on the drawing software AutoCAD. Compared with the commercial software currently available for steam balance, only information needs to be manually entered into the drawing software AutoCAD, and the rest of the process is completed automatically.

[0131] This invention establishes a steam balancing system for the coking plant's steam pipeline network. This system is used to achieve static steam balancing, determine steam supply plans, and select equipment and pipeline types, thereby improving the quality and efficiency of steam balancing. It also provides guidance for dynamically determining operating parameters during operation, empowering engineering design, achieving both quality and efficiency improvements, improving product quality, and contributing to the high-quality development of the coking industry.

[0132] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A coking plant steam balance method based on AutoCAD, characterized in that: The specific steps include: S1: Establish a steam balance system. The steam balance system consists of users, supply sources, and pipelines connecting users and supply sources. Users and supply sources are nodes, and pipelines are channels connecting nodes, forming a topological structure. S2: Construct steam user objects, supply source objects, and pipeline objects based on attributed blocks in AutoCAD; S3: Summarize user object information based on the steam user object created in AutoCAD and create a user table; S4: Summarize the supply source object information based on the steam supply source object created in AutoCAD and create a supply source table; S5: Summarize pipeline object information based on pipeline objects created in AutoCAD and create a pipeline table; S6: Create a node table based on the pipeline table, user table and supply source table; S7: Create a working condition pipeline table based on the working condition summary table and the node table, and obtain the flow rate of each pipeline in each working condition by calculation; S8: Based on the working condition pipeline table, calculate the diameter of each pipeline and create a pipeline diameter table; S9: Based on the node table and pipeline diameter table, obtain the reducer setting situation and create a reducer table.

2. A coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S2, the steam user object includes the user name, steam usage, and working system attribute information.

3. A coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S2, the supply source object includes the supply source name, supply capacity and work system attribute information.

4. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S2, the pipeline object includes the connection start point, the connection end point, the start point associated object and the end point associated object attribute information. The flow direction of the medium in the pipeline is from the pipeline start point to the pipeline end point.

5. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S3, the user table is formed by summarizing AutoCAD space user objects and their information; in S4, the supply source table is formed by summarizing AutoCAD space supply source objects and their information; in S5, it is formed by summarizing AutoCAD space pipeline objects and their information.

6. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S6, the node table includes the attribute information of the mainstream input pipeline, branch input pipeline, mainstream output pipeline and branch output pipeline, which is formed by summarizing the user nodes, supply source nodes, pipeline start point and end point nodes; first, the pipeline start point and end point in the pipeline table are traversed to obtain the node list, and then based on the spatial layout and connection of the pipeline objects in AutoCAD, the mainstream input pipeline, branch input pipeline, mainstream output pipeline and branch output pipeline information of each node are obtained; the mainstream input pipeline and mainstream output pipeline of each node must be present, and the branch input pipeline and branch output pipeline may exist, but not at the same time.

7. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S7, pipeline flow calculation includes iterative calculation: When traversing the working condition pipeline point for the first time, if its end point is associated with a user, the user flow is obtained as the pipeline flow; If it is associated with a supply source, the flow of the supply source is obtained as the pipeline flow; The node table is traversed in a loop. If only one of the main stream input pipeline flow, tributary input pipeline flow, main stream output pipeline flow, or tributary output pipeline flow of a node is unknown, the sum of the node inflow and outflow is used to solve the problem, and the result is written into the working condition pipeline table. Until the pipeline flow required for the working condition is obtained in the working condition pipeline table, the pipeline flow associated with the supply source in the state to be determined is the flow of the supply source.

8. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S7, pipeline flow calculation involves using matrix theory to build a matrix and solve it: First, sort out the variables and traverse the working condition pipeline points. If the end point is associated with a user, the user flow is obtained as the pipeline flow; If it is associated with a supply source, the flow of the supply source is obtained as the pipeline flow; The remaining pipeline flows are taken as variables, and a matrix is established for solution. At this time, the pipeline flow associated with the supply source in the state to be solved is the supply volume of the supply source.

9. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S8, pipeline diameter calculation: Where: D n is the inner diameter of the pipe, mm; Q m is the mass flow rate, t / h; ρ is steam density, kg / m 3 ; v is the steam velocity, m / s.

10. The coking plant steam balance method based on AutoCAD according to claim 1, characterized in that: In S9, the reducer table stores information of pipelines to which reducers need to be added calculated by the system.

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