Waste heat boiler plant area steam-water pipe network design method based on pipeline stress analysis

Abstract

The invention relates to a method for designing a steam-water pipe network in a waste heat boiler plant area based on pipeline stress analysis, which comprises the following steps of: selecting corresponding specifications for constraint according to the application of a pipeline, inputting corresponding pipe network parameters in pipeline stress analysis software, and arranging a pipe network, a support hanger and a pipeline route according to on-site investigation and general drawing arrangement. S6, pipeline stress calculation and comparison and judgment of standard thresholds are carried out, support hanger and pipeline routing adjustment is carried out, pipeline stress calculation and threshold judgment are carried out again through pipeline stress analysis software, if judgment is not successful, the step S6 is executed, and if judgment is successful, the step S6 is executed; if the judgment is successful, forming a plant steam-water pipe network model which conforms to plant layout and ensures safe pipeline operation; through field investigation modeling and pipeline stress analysis software, steam-water pipeline arrangement, support and hanger positions and model selection are calculated and simulated, and reasonable design of the plant steam-water pipe network is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline engineering, and in particular to a method for designing a steam-water pipeline network in a waste heat boiler plant based on pipeline stress analysis. Background Art

[0002] At present, my country's steel industry is evolving towards a high-quality development stage of environmental protection and low carbon. In the future, it will be guided by environmental protection and low carbon to shape a new development pattern and usher in a new trend of green development. According to environmental protection requirements and sintering production needs, most sintering plants are gradually building new green and environmentally friendly enterprises, and upgrading their flue gas systems for environmental protection. The exhaust gas temperature of the lower tail wind box of the sintering flue is relatively high. In order to ensure the maximum and effective utilization of energy, the exhaust gas at the tail should be recovered for waste heat. On the basis of reducing flue gas emissions, the waste heat should be reasonably utilized to reduce solid fuel consumption. Because most waste heat recovery projects are upgrading and transformation projects, the on-site layout is chaotic and complicated, and the layout of the steam-water pipeline network is particularly important. Summary of the invention

[0003] The present invention provides a method for designing a steam-water pipeline network in a waste heat boiler plant based on pipeline stress analysis. Through on-site survey modeling and using pipeline stress analysis software, the layout of the steam-water pipelines, the position and selection of supports and hangers are calculated and simulated. Through an intuitive modeling environment and stress calculation and analysis functions, a reasonable design of the steam-water pipeline network in the plant is achieved.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for designing a steam-water pipe network in a waste heat boiler plant based on pipe stress analysis comprises the following steps:

[0006] S1. Select corresponding specifications for constraints according to the purpose of the pipeline;

[0007] S2. Input the corresponding pipe network parameters into the pipe stress analysis software;

[0008] S3. Arrange the pipe network, supports and hangers and pipeline routes according to the site survey and general layout;

[0009] S4. Calculate pipeline stress and determine standard threshold;

[0010] S5. Adjust the support brackets and pipeline routing;

[0011] S6. Recalculate the pipeline stress using pipeline stress analysis software and compare the calculation result with the above threshold value;

[0012] S7. If the determination is unsuccessful, return to step S6. If the determination is successful, a factory steam-water pipe network model that conforms to the factory layout and ensures the safety of pipeline operation is formed.

[0013] Furthermore, the pipe network parameters include pipe outer diameter, wall thickness, material, pressure, temperature and insulation material.

[0014] Furthermore, the support and hanger include a sliding support, a fixed support, a spring hanger, a spring support, a constant force hanger, a rigid hanger, a guide support and a position-limiting support and hanger.

[0015] Furthermore, the specification thresholds include pipeline lateral thrust, pipeline axial thrust, pipeline load and pipeline thermal displacement value.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) Using pipeline stress analysis software, arrange the steam and water pipeline layout, support and hanger positions and selection, and establish a pipeline model. Through the intuitive modeling environment and stress calculation and analysis functions, the reasonable design of the steam and water pipeline network in the factory area is realized;

[0018] 2) Through on-site survey and using software to perform pipeline stress analysis, the design process is more in line with the actual construction and plant requirements, which is convenient for on-site construction and production application. Actual cases have proved that the use of pipeline stress analysis software can effectively avoid problems such as strain and stress damage, and form a plant steam and water pipeline network model that conforms to the plant layout and ensures the safety of pipeline operation;

[0019] 3) Compared with traditional manual calculation, stress analysis is more convenient and intuitive, and compared with automatic drawing generation, it is more suitable for the actual situation on site. For the same type of design, this method is recommended to avoid engineering risks and provide a theoretical basis for technical disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0022] See Figure 1 , is a flow chart of the method of the present invention. The present invention is a method for designing a steam-water pipe network in a waste heat boiler plant based on pipe stress analysis,

[0023] S1. According to the actual use and specifications of the pipeline network, select the corresponding specifications and rules in the software database for calculation constraints. For the waste heat boiler steam-water pipeline network, use the GD87 Thermal Power Plant Steam-Water Pipeline Manual and GD2000 Steam-Water Pipeline Manual specifications for constraints.

[0024] S2. Input pipeline parameters into pipeline stress analysis software. The pipeline parameters include pipeline outer diameter, wall thickness, material, pressure, temperature, insulation material, etc. The elbows for pipeline connection shall be elbows that meet the standard material specifications. The parameters shall be adapted to boiler operating conditions. The pipeline with an outer diameter of 219×6mm shall be designed. The steam temperature is 200℃, the pressure is 0.45MPa, the insulation material is 150mm aluminosilicate products, and the elbows are adapted elbows made of 20# steel.

[0025] S3. According to the on-site survey and general layout, avoid pipeline collision and determine the pipeline route. The total length of the pipeline route is 150m, which is more in line with the on-site construction layout than relying solely on the pipeline automatic generation software.

[0026] S4. Supports and hangers matching the pipeline setting include sliding supports, fixed supports, spring hangers, spring supports, constant force hangers, rigid hangers, guide supports, limited support hangers, etc. The positions of supports and hangers can use the columns and beams in the factory area, or new support and hanger beam foundations can be built. For specific working conditions, refer to the "Design Manual for Steam and Water Pipeline Supports and Hangers in Thermal Power Plants", and take their structural types into consideration; a total of 42 sliding supports, 4 fixed supports, and 4 guide supports are set up, and expansion bends are set up at corresponding locations to offset displacement.

[0027] S5. Calculate the pipeline model and determine the standard threshold using pipeline stress analysis software according to the steam-water pipeline network and corresponding supports and hangers determined in step S4;

[0028] The pipeline stress analysis software includes Auto CAD, Haochen CAD, UESoft AutoPDMS, UESoftAutoPSA, and UESoft PHS3D software.

[0029] S6. Based on the calculation results obtained in step S5, combined with the pipeline model and the node number attached to the stress analysis software, the calculated values ​​are compared with the threshold values ​​to determine whether the parameters such as node stress, displacement, support and hanger load are abnormal;

[0030] The threshold comparison includes pipeline lateral thrust, pipeline axial thrust, pipeline load, pipeline thermal displacement value, etc., to ensure the passage of primary stress and secondary stress.

[0031] S7. According to the data results obtained in step S6, adjust the pipelines and supports and hangers in the model. For supports and hangers whose stress exceeds the standard threshold, consider whether the span and support and hanger type are appropriate. For displacement exceeding the standard threshold, add compensating bends or change the span to solve the problem.

[0032] S8. According to the pipeline model adjusted in step S7, further calculation and review are performed through pipeline stress analysis software. After passing the calculation, a complete steam-water pipeline network model of the plant area is formed to ensure the safety of pipeline operation.

[0033] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A method for designing steam-water pipe network in waste heat boiler plant based on pipe stress analysis, characterized in that: The steps include: S1. Select corresponding specifications for constraints according to the purpose of the pipeline; S2. Input the corresponding pipe network parameters into the pipe stress analysis software; S3. Arrange the pipe network, supports and hangers and pipeline routes according to the site survey and general layout; S4. Calculate pipeline stress and determine standard threshold; S5. Adjust the support brackets and pipeline routing; S6. Recalculate the pipeline stress using pipeline stress analysis software and compare the calculation result with the above threshold value; S7. If the determination is unsuccessful, return to step S6. If the determination is successful, a factory steam-water pipe network model that conforms to the factory layout and ensures the safety of pipeline operation is formed.

2. The method for designing a steam-water pipe network in a waste heat boiler plant based on pipe stress analysis according to claim 1 is characterized in that: The pipe network parameters include pipe outer diameter, wall thickness, material, pressure, temperature and insulation material.

3. The method for designing a steam-water pipe network in a waste heat boiler plant based on pipe stress analysis according to claim 1 is characterized in that: The support and hanger brackets include a sliding bracket, a fixed bracket, a spring hanger, a spring bracket, a constant force hanger, a rigid hanger, a guide bracket and a limit support and hanger bracket.

4. The method for designing a steam-water pipe network in a waste heat boiler plant based on pipe stress analysis according to claim 1 is characterized in that: The specification thresholds include pipeline lateral thrust, pipeline axial thrust, pipeline load and pipeline thermal displacement values.

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