本次设计是进行的是尿素转换阶段预热器的工艺及设备设计，本着以安全为前提

This design is to carry out the process and equipment design of the preheater in the urea conversion stage, in accordance with the principle of safety as the premise, in strict accordance with GB150 on the premise of ensuring its quality, economic rationality and practicality as far as possible. , GB151 requirements for design. <br>This design process mainly has six parts: the position, role and equipment selection of the preheater in production, the design of the process flow chart, the design of the process parameter control plan, the calculation of the equipment process and the outline size of the equipment, the design of the equipment structure, Equipment strength calculation and verification, processing technology. The focus of this design is the processing technology and manufacturing technology. <br>The introduction describes in detail the important role of the preheater in chemical production. The process design and calculation are mainly based on the physical properties of the media and the working conditions they are in. The equipment outline size calculation and equipment cylinder diameter are calculated; the heat exchange area and the number of exhaust pipes are obtained through the heat load calculation. The structural design is to consider the temperature, pressure and corrosion performance of the materials, so as to determine the materials and models of each part of the preheater and select the appropriate structure. The strength calculation solves the strength problem and is used to check whether the designed structure meets the requirements and the measures to be taken when the requirements are not met. <br>Keywords: preheater process calculation structure design strength analysis machining process

This design is carried out in the urea conversion phase of the preheater process and equipment design, in line with the principle of safety as a prerequisite, in the best possible guarantee of its quality, economic rationality and practicality and other technical indicators under the premise of strict compliance with GB150, GB151 requirements for design.<br>This design process mainly has six parts: preheater position in production, role and equipment selection, process flow chart design, process parameter control program design, equipment process calculation and primary equipment profile size, equipment structure design, equipment strength calculation and verification, processing process. The focus of this design is processing technology and manufacturing technology.<br>The important role of this preheater in chemical production is described in detail in the introduction. Process design and calculation mainly through the material parameters of the medium and the working state in which the equipment profile size calculation and equipment barrel diameter, through the calculation of heat load to obtain heat exchange area and the number of tubes and other parameters. Structural design is to consider the temperature of the material, pressure, corrosive energy, so as to determine the preheater parts of the material and model, choose the appropriate structure. Intensity calculation solves the problem of strength, which is used to verify that the structure of the design meets the requirements and what measures should be taken if the requirements are not met.<br>Keywords: Preheater Process Calculation Structure Design Strength Analysis Process

This design is to design the process and equipment of the preheater in the urea conversion stage. Based on the principle of taking safety as the premise, the design shall be carried out in strict accordance with the requirements of GB150 and GB151 on the premise of ensuring its quality, economic rationality and practicability as far as possible.<br>This design process mainly includes six parts: the position, function and equipment selection of preheater in production, process flow chart design, process parameter control scheme design, equipment process calculation and preliminary equipment outline size, equipment structure design, equipment strength calculation and verification, and processing technology. The focus of this design is processing technology and manufacturing technology.<br>The important role of the preheater in chemical production is described in detail in the introduction. The process design and calculation are mainly based on the physical parameters of the medium and their working conditions to calculate the equipment outline size and the diameter of the equipment barrel; through the calculation of the heat load to get the parameters such as the heat exchange area and the number of pipes. The structure design is to consider the temperature, pressure and corrosion performance of the material, so as to determine the material and model of each part of the preheater, and select the appropriate structure. Strength calculation solves the problem of strength, which is used to check whether the designed structure meets the requirements and the measures to be taken when it does not meet the requirements.<br>Key words: preheater process calculation structure design strength analysis processing technology