Understanding of commissioning procedures for large chemical plants

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Understanding of the commissioning procedures of large-scale chemical installations (Taihua Group Chemical Plant 1 030021) As a development process of objective things, the commissioning procedures of large-scale chemical installations include closely connected and orderly stages and links, thus forming the inherent regularity of commissioning of chemical installations. This is independent of people's will and must be strictly followed. The chemical plant commissioning procedure includes the preparation of the overall commissioning plan, pre-commissioning, intermediate handover, chemical commissioning and other stages. It is the entire process from construction to completion and put into production. The order in which the stage work is carried out systematically reflects the inherent laws and objective requirements of the commissioning procedure. Improving people's understanding of the commissioning procedures and consciously following the commissioning procedures during commissioning activities are the key and foundation for successful commissioning of large chemical equipment. The commissioning procedure is a summary of practical experience. The "Chemical Industry Large and Medium-sized Equipment Commissioning Work Specifications" (hereinafter referred to as the specifications) formulated by the Ministry of Chemical Industry in 1991 and implemented on October 1, 2016, summarizes and draws on many years of experience in commissioning work on chemical equipment, and clearly stipulates It stipulates the conditions that must be met before commissioning, the basic procedures for commissioning, the standards that should be met, the requirements for safety work and visa handover, etc. It is applicable to the commissioning of large and medium-sized chemical plants constructed in China and is the current guiding "standard" for the commissioning of large-scale chemical plants. Due to the constraints of specific issues in practical activities, people often have different understandings of the scientific nature and seriousness of the "Specifications", which leads to inconsistencies in the implementation of the "Specifications". The preparation of the overall commissioning plan should be completed before the installation of the process pipeline of the production device begins. It must be prepared by the construction unit organizing the production department and construction and design units based on the overall construction plan and design documents, with the production department as the main body, and executed after approval by the superior main business department. The overall commissioning plan is a comprehensive plan to guide construction and commissioning. Its core part is the overall overall control plan for commissioning. Test run generally includes two stages: linkage test run and chemical test run. The network diagram drawn based on the time required for linkage test run of each unit device and the process sequence is called the linkage test run control network diagram. The network diagram drawn based on the end-to-end connection between each unit device and the required time is called the chemical feed control network diagram. Connect the linkage test run with the chemical feed test run overall planning network diagram to form an overall overall test run overall control plan diagram. According to the commissioning overall overall control plan and the introduction contract or planned production date, the construction progress can be guided and the project installation progress overall overall control plan can be prepared. These are two links in the same stage, which must be planned as a whole and closely connected. Especially for the main control points in the plan, mathematical models must be used to scientifically determine the network diagram preparation method to ensure on-schedule arrival. Before commissioning, pre-commissioning must be carried out, which refers to various preparations before the chemical input after the installation project is completed. During the pre-commissioning stage, the production department should organize engineering and technical personnel of each device to conduct inspections according to the content specified in the design documents and the construction and acceptance specifications. The content of the inspection and the work performed must be strictly controlled during the pre-commissioning stage, and there is no room for sloppiness. Otherwise, you will be punished by objective laws. For example: Taihua produces 20,000 tons of toluene diisocyanate per year