Process package document design: What aspects need attention in the process description?

1.3 Process Description 1.3.1. Process Principle and Characteristics Explain the physical and chemical principles and characteristics involved in the designed process. The main physical and chemical principles include momentum transfer processes (single-phase or multi-phase flow), heat transfer processes, mass transfer processes, and chemical reaction kinetics equations (the three transfers and one reaction). Equations can be used to express these processes in detail; for more complex, multi-step procedures, flowcharts can be employed to illustrate the relationships between various steps, with the physical and chemical principles and characteristics of each step indicated. 1.3.2. Process operating conditions The main operating conditions in the production process include temperature, pressure, material ratios, reaction residence time, etc. The conditions for different process operating scenarios should be listed separately. For batch process operations, it is also necessary to specify the operation cycle, the amount of material added at one time, the addition rate, and the order of addition. Definition: Reaction residence time refers to the total time that a fluid spends within a system, starting from the moment it enters the system and up to the moment it leaves it; in other words, it is the time taken for the fluid to travel from the inlet to the outlet of the system. 1.3.3. Process Flow Description: It describes in sequence the process by which materials pass through the process equipment, including pretreatment, reaction, heat exchange, separation, as well as the fate of intermediate products and by-products, and the final product. It describes the main operating conditions of the key process equipment, such as temperature, pressure, and material ratios. The main process control requirements during the description should be clearly listed in tabular form, including the control requirements for emergency shutdown. 1.3.4. Process Flow Diagram (PFD) The content and depth control principles for a PFD are such that, once the PFD document is completed, all process-related data and conditions can be found on it. The PFD process flow diagram must include at least the following: 1) Process equipment along with its tag number, name, dimensions, operating pressure, and operating temperature (usually consistent with the parameters in the equipment list) ； 2) Main process pipelines, model ； 3) Special valve location, model ； 4) Logistics numbering and operating conditions, including temperature, pressure, flow rate, and phase state (to form a logistics data table) ； 5) Heat and cold power of industrial furnaces and heat exchangers ； 6) Name, operating conditions, and flow rate of utility materials ； 7) Main control and interlock schemes, important instrument control schemes. When creating the diagrams, try to place closely related process equipment together to facilitate understanding of the process by those involved, thereby enabling the first review of the process package. The review should be accompanied by relevant written and video records to facilitate the revision of the process after the review is completed. 1.3.5. Logistics Data Table The logistics data table should list all the main logistics data under different operating conditions, including the start and end points of each flow, its composition, phase state (gas, liquid, solid), total flow rate, gas flow rate, liquid flow rate, amount of solid added, temperature, pressure, molecular weight, gas density, liquid density, specific gravity of solids, heat enthalpy of the gas phase, heat enthalpy of the liquid phase, etc. Definition: Enthalpy is an important state parameter in thermodynamics that represents the energy of a material system; it is equal to the sum of the internal energy and the product of pressure and volume, and is commonly denoted by the symbol H. In chemical reactions, the change in enthalpy (ΔH) is equal to the heat absorbed or released by the system. (The entry is from Baidu Baike)

The discussion for you to discuss: L:L:L

The process description in the process package must clearly outline the process flow, materials, heat, process characteristics, start-up and shutdown conditions, as well as intermittent switching conditions; that’s what I think. The PFD must contain detailed data on the material points, while the PID should show the basic characteristics of the pipelines (including material type, dimensions, pressure rating, numbering, insulation, material code, etc.). The control interlocks also need to be described in detail (including control logic, control points, signal display and remote control information for control units, as well as the selection of execution units). The content related to storage and transportation in the overall layout must also be explained in detail, including the total storage capacity of various raw materials, their daily consumption rates, and the requirements for storing and transporting special materials.