This paper discusses the new engineering management mode in petrochemical industry, i.e. from integrated engineering to integrated operation and maintenance, analyzes the new development trend of engineering design software for the process industry based on the merger and acquisition cases of international process industry giants, summaries and analyzes the market application of petrochemical engineering design software commonly used in Chinese petrochemical industry, and finally discusses the maturity and development path of China’s independently developed engineering design software.

Unpowered adsorption technology has the advantages of low activated carbon consumption and low investment and operation and maintenance costs. The sewage tank of a project discharges gas only 60% of the time during normal operation and 40% of the time at the maximum discharge of sewage, so it is more appropriate to adopt unpowered adsorption process. According to the tail gas composition and flow rate in sewage tank, a calculation method is established and the parameters including activated carbon loading amount, basic dimension, alarm and interlock temperature and emergency gas flow rate are determined, providing a basis for the design of unpowered adsorption system. The process is further analysed, and some safety recommendations are put forward, such as good gas distribution structure, high-efficiency dewatering device, overpressure protection measures, electric heat tracing anti-freezing system, check valve and flame arrester, measures to maintain the gas flow in activated carbon bed and insulation measures.

This paper takes the No.1 cooling water plant in the new-built ethylene project of a petrochemical plant as an example, introduces the main process flow and seawater utilization mode of closed circulating cooling water system using seawater as the cooling medium in large-scale petrochemical plants, provides the calculation and automatic control process of pressure stabilizing and cooling water supply equipment, discusses the selection and operation principles of critical equipment such as circulating cooling water lift pump, ciruclating cooling water plate heat exchanger, seawater filter and dosing system, and summarizes the characteristics and advantages of closed circulating cooling water system using seawater as the cooling medium, providing references for the water saving, energy saving and cost saving of petrochemical plants in coastal areas.

For the design of pair flanges on both sides of tubesheet, relevant codes of various countries require that the calculation shall be based on the larger value as individually calculated under each side condition. Some engineers ignore the principle that the bolt load on the flanges on both sides should be the same, and use the higher design pressure in the flange calculation. In this paper, the maximum bolt load method and the maximum design pressure method for calculating design bolt load and design flange moment are studied in detail for the pressure vessel flange commonly used in heat exchanger, and it is found that the maximum design pressure method may cause conservative or unsafe design of flange.

The basic philosophy of oil-mist lubrication is introduced, the differences between purge oil-mist lubrication and pure oil-mist lubrication in terms of configuration and structure are discussed, and the different application conditions of the two oil-mist lubrication methods in engineering are analyzed in detail. The key points of design for transforming the lubrication method of the existing pumps into purge oil-mist lubrication and pure oil-mist lubrication are put forward respectively. It is concluded that purge oil-mist lubrication can be chosen preferably according to the transformation conditions, so as to enhance the mechanical reliability and reduce the transformation difficulty. Finally, relevant requirements of the piping design of oil-mist lubrication are introduced.

According to the present operation of centrifugal pumps in China, this paper introduces and analyses the calculation method and process of centrifugal pump impeller cutting, and puts forward the modification plan. The energy saving operation of centrifugal pumps is realized, the purposes of energy saving and consumption reduction are achieved, and the safe and smooth operation of the plant is ensured.

An optimization design scheme for the debottlenecking of 550 KTA polypropylene plant in Fujian Refining and Ethylene Project (FREP) is introduced. The reserved space of Phase I construction was fully used, the principle of making the best use of existing equipment was followed in equipment selection, and the expansion of purge vessel in its original position was successfully completed, creating conditions for the smooth progress of the debottlenecking revamping project. While giving consideration to advanced technology, the revamping cost was remarkably reduced, thus improving the construction efficiency, technology and economy of the project.

The purpose of supplier development, evaluation and selection is to enable the winning suppliers to meet the needs of enterprises and help to achieve the short-term, medium-term and long-term goals of the enterprises. The frequently occurred late delivery of suppliers, quality problems of products delivered and uncooperative suppliers are the typical expressions of the lack of effective management of suppliers. Generally seven steps are needed to improve the management, i.e. obtaining the basic information of suppliers, checking the basic qualification of suppliers, inspecting the production and inspection capabilities of suppliers, investigating the storage and transportation capabilities of suppliers, understanding the R & D capabilities of suppliers, identifying the operation capabilities of quality assurance systems of suppliers, and verifying the true situation of suppliers' after-sales service systems.

This paper introduces the process characteristics, process principle and influencing factors of the production of sec-butyl acetate from mixed C4, and at the same time, the main technical indexes and product quality indexes of the industrial application of sec-butyl acetate plant are introduced. Using mixed C4 to produce sec-butyl acetate can effectively utilize the rich and cheap mixed C4 raw materials. Compared with the traditional alkyd esterification method, the alkene acetic acid addition method is a new route for the synthesis of sec-butyl acetate. With short process flow, less process equipment, mild reaction conditions, energy saving and environmental protection, high product purity and low processing cost, this process has strong competitive advantages.

It is very important at home and abroad to detect the internal fault of oil filled electrical equipment by analyzing the dissolved gas in insulating oil with gas chromatography. The analysis technology of dissolved gas in transformer oil is used to judge the transformer failure according to the components and content of the gas in transformer oil, the fault type, general fault location, fault severity and fault development trend of the transformer are further analyzed, and some targeted preventive measures are accordingly put forward, so as to realize online detection and fault diagnosis and reduce the probability of transformer failure. It provides guidance for safe operation.

According to the C4 raw material composition of a petrochemical plant, a new process route for producing high-purity isobutane was designed. Through process simulation software, the hydrogenation reaction unit and the separation unit for removing light components were optimized, and the optimal operating parameters of each unit were determined. This optimization not only saved equipment investment, but also reduced energy consumption, providing guidance for the rational utilization of C4 fractions.

The problem of low lubricating oil pressure interlock shutdown of a centrifugal compressor unit caused by the voltage sag shutdown of oil pump driving motor at the initial stage of trial production of a coal chemical enterprise was analyzed. The results showed that the oil system had some design defects, such as wrong arrangement of accumulator and pressure measuring point, void volume of pump outlet pipeline and no one-way valve at the root of accumulator, which led to the weak anti-fluctuation ability of the oil system. Some solutions such as adding self-starting interlock of oil pump, optimizing the position of standby pump self-starting signal pressure measuring point, lowering the position of vacant pipeline at the outlet of oil pump and installing a one-way valve at the root of accumulator were proposed and implemented, so as to completely solve the problems. The system and component improvement scheme introduced in this paper can provide reference for the oil systems of other compressor units.

Pressure vessels are an indispensable part of petrochemical refineries. The introduction of artificial intelligence and computational fluid dynamics technology into the design of pressure vessels is an important application field for research by refinery companies worldwide. After years of scientific research, artificial intelligence technology and computational fluid dynamics technology have been developed and applied very maturely. This project uses artificial intelligence algorithms to further summarize the results of fluid simulation on the basis of fluid simulation. After a lot of numerical simulation calculations, the relationship between equipment wear and flow field distribution is established. Fluid mechanics technology has been well verified in the field of petrochemical engineering. The reliability of the calculation results is relatively robust. Using artificial intelligence technology can get better regression and recursion.

Cracking furnace covers a large area with high structure and has many high temperature and high pressure pipelines. Taking an ethane cracking to ethylene project as an example, this paper briefly introduces the process flow, important equipment types and horizontal and vertical layout of ethylene cracking furnace, and discusses the principles of equipment layout and platform setting. The process properties, layout scheme, stress calculation and key points and difficulties in support and hanger setting of the material system, cracking system, steam water system, sewage system and fuel system are analyzed. The piping layout of cracking furnace should be planned reasonably, and the characteristics of piping system, flexibility of piping, operation and maintenance should be considered comprehensively.

This paper introduces the design principles of pump inlet pipe, takes the inlet pipes of several hot-oil pumps in the CDU/VDU and light hydrocarbon complex of a refinery as an example, discusses the optimization schemes of piping layout based on the CASERII stress analysis results, and focuses on the solutions to the problems emerged during the flexibility design of pump inlet pipe, i.e. how to meet the requirements of pump nozzle stress by optimizing the piping layout, changing the pipe-wall thickness and taking some other measures.

This paper introduces the general layout, basic design and detailed design results of the pipe rack on a super large FPSO, and analyzes the requirements of the Oil Company's General Specifications and Classification Society's Rules for the structural design of pipe rack and hull stool. The influence of the longitudinal bending of FPSO hull on the boundary condition of hull stool is taken into account in the structural design of pipe rack. Transverse pin connection is set between the pipe rack and the topside module to control the weight of the pipe rack and the hull stool with the aid of the transverse support stiffness of the topside module. In the engineering design of FPSO, the quantitative risk analysis of oil and gas leakage and deflagration chain hazards of the topside module is carried out, and the design explosion overpressure of the pipe rack and hull stool is determined. The strength of the hull stool of pipe rack and FPSO main deck under blast accident is analyzed by using the finite element method. Based on the simplified fatigue analysis method and spectral analysis method of cumulative fatigue damage, the fatigue life of the hull stool of pipe rack is predicted.