Mercaptan removal is an important part of liquefied petroleum gas (LPG) refining process, and a relatively perfect theoretical system has been formed for its proprietary technology. The four research directions of mercaptan removal for LPG are introduced from the aspects of mercaptan removal system, caustic catalytic oxidation regeneration system, tail gas treatment methods and technologies and waste caustic treatment, the research achievements of mercaptan removal for LPG are introduced from the aspects of material structure，physical properties, chemical reaction characteristics, process principle, technological process and patent technology and methods, and the direction and ideas of its future development are discussed.

In recent years, modular design and construction has been developing in petrochemical projects, including the design and construction of process units, which provides high-quality products and innovative development mode for project construction. Through the practice of modular design of petrochemical plants, this paper introduces the types of modules and the advantages of module construction, explores the implementation characteristics and requirements of modular design, as well as the challenges to the project and the prospect of future trend.

Flare system is an important facility to ensure production safety and reduce environmental pollution of petrochemical plants. The design of flare system is related to the safety of plants. Safety is relative, and investment and safety are in unity of opposites. Reasonable determination of flare design load can save the investment and floor space and reduce the operation and maintenance costs under the premise of ensuring plant safety. This paper introduces the basic principle of determining the design load of flare system, the calculation method of relieving flowrate under different scenarios, and the ways to reduce the design load of flare in petrochemical plants, which has certain guiding significance for flare design of petrochemical plants.

The air conditioning scheme design of VAV system in petrochemical central laboratory is special (highly risky) and difficult. In this paper, the suitable VAV air conditioning schemes for central lab are analyzed, and the methods for simplifying VAV air conditioning scheme are also given. After that, the indoor environment automatic control scheme, control effect and energy consumption of several kinds of main air conditioning schemes are emphatically analyzed. At last, the optimized two automatic control ways, i.e., centralized and decentralized control and constant value and servo control, are put forward, and an optimized air conditioning scheme with independent air supply and air conditioning system, namely the centralized air supply and air conditioning scheme with double ducts, are proposed, which can be used for reference by designers of similar air conditioning schemes.

In this paper, computational fluid dynamics software Ansys Fluent and Ansys Workbench are used to simulate the fluid-structure interaction of tube head of fired heater, focusing on the flow field distribution at the tube head and the stress of the tube head under the effect of flow field. The results show that there is obvious drift in the fluid in horizontal manifold, which leads to the uneven distribution of flow in each branch pipe. There is vortex flow in the flow field at the straight edge of tube head, and the vortex flow always accompanies when the fluid flows to the inside of the tube head. Under the action of flow field vortex, the upper part of the center of the head is most likely to be destroyed, which is basically consistent with the actual damage position. Based on the calculation results, a solution is suggested.

Vibration is a key indicator affecting the long-term reliable operation of water-injected process gas twin screw compressor, and the requirements for vibration amplitude are becoming increasingly stringent. The vibration of a water-injected process gas twin screw compressor is studied in this paper. Based on orthogonal design, the influence of different operating parameters of compressor such as rotating speed, discharge pressure, volume flow of injected water and bearing oil supply on vibration are measured experimentally and analyzed. The results show that with the increase in rotating speed and discharge pressure, the unbalanced force of compressor rotor shafting increases, the gas pulsation amplitude increases and the compressor vibration increases. With the increase in volume flow of injected water, the vibration decreases first and then tends to be stable. There is an optimal volume flow of injected water for the minimum vibration of compressor. With the increase in bearing oil supply, the vibration of compressor increases gradually. Rotating speed and discharge pressure are the key factors affecting the compressor vibration, while the volume flow of injected water and bearing oil supply have the minimum impact on vibration. The direction of the optimization and improvement of compressor vibration is pointed out.

Flarenet software was adopted to simulate the working process of relief pipe network of styrene safety relief-recovery system completed, and optimal design was performed based on dynamic simulation results combined with engineering experience. The countermeasures against condensation recovery system failure were also considered. The simulation results show that styrene safety relief-recovery system can meet relevant safety and environmental standards. Balanced bellows relief valve should be selected for the pipe network. Dynamic simulation and fire protection and insulation measures can not only realize a more reasonable operation of the pipe network, but also reduce the amount of relief valves and the pipe diameter to some extent, thus reducing the engineering design investment. The set pressure of rupture disk is 50 kPaG, which is reasonable. Appropriately increasing the set pressure of relief valve or increasing the outlet pipe diameter of relief valve can meet the back pressure requirements of safety valve of the new safety relief system.

The thermodynamic and kinetic models of chemical reactions were constructed based on Python language to study the influence of reaction conditions on the reaction balance and conversion rate of synthetic ammonia reaction, and the results were visualized, providing an open source and efficient computational modeling idea for studying the reaction process of synthetic ammonia. The feasibility of modeling the reaction thermodynamics and kinetics using open source language was explored, which provides reference for the localization of related modeling software. This method can be extended to other reaction systems to construct thermodynamic and kinetic models of different reaction processes and reactors, providing support for reaction mechanism models for chemical process optimization and reactor design.

The large capacity weak grating technology not only has the advantages of sensitive optical fiber sensing detection and on-site passivity, but also has distributed networking and long monitoring distance. It is very suitable for the petrochemical field, and can achieve the efficient automatic detection, judgment and processing of key states of oil pump unit. The weak grating sensing technology is used to monitor the temperature and vibration status of oil pump unit in real time. Once the temperature is abnormal, it will give an alarm immediately. It can also extract key features by analyzing vibration signals in time domain and frequency domain, and identify, warn and determine the location and type of abnormal vibration with the help of pattern recognition algorithm, so as to help maintenance personnel find the failure of oil pump unit in time.

Recently, leakage frequently occurred in instrument measurement nozzles in petrochemical enterprises, which is caused by the corrosion under insulation, the medium corrosion and the poor manufacturing quality of material. Some control and prevention measures, daily check strategies and maintenance points are proposed by analyzing several kinds of failure cases and corrosion mechanism of the measurement nozzles, so as to ensure the long-term and safe operation of the units.

In view of the problems in the thermal insulation structure of high-temperature pipelines in petrochemical units such as large heat dissipation loss and seriously damaged thermal insulation structure, a new composite thermal insulation structure of nano ceramic fiber thermal insulation material and high-density rock wool pipe is adopted to replace the widely used thermal insulation structures of aluminum silicate fiber cotton, composite silicate and calcium silicate coiled materials. The integral insulation structure, which is characterized by the extremely low thermal conductivity of nano ceramic fiber thermal insulation material and the high strength of high-density rock wool pipe, greatly reduces the heat dissipation loss of high-temperature pipelines and significantly prolongs the service life of insulation structure for high-temperature pipelines.

Refining and petrochemical enterprises have a huge number and variety of thermal insulation pipelines. Therefore, the management is difficult and inefficient. Through the development of hierarchical management system for pipeline insulation, the functions of pipeline insulation data query, hierarchical management and evaluation, energy consumption management and online operation status monitoring are realized. The system can provide auxiliary decision support for technicians and managers, screen the pipelines in urgent need of transformation, and make efficient use of transformation funds. The system was applied to screen 16 steam pipelines in a refinery, which were in urgent need of transformation. After the transformation, the energy-saving effect was remarkable. The system can achieve the all-round monitoring and management of pipeline insulation conditions, improve the management level of pipeline insulation, and achieve significant economic and social benefits in the aspects of energy-saving, environmental protection and safety.

Automatic stereoscopic warehouse in petrochemical industry is a new automated stereoscopic storage mode, which adopts intelligent management system and integrates automatic warehousing, intelligent storage management and automatic delivery, mainly including hardware and software systems such as goods shelves, stackers, conveyors, circular shuttles, dock levelers and software control systems. Based on the actual construction of the stereoscopic packaging warehouse of Sino-SK Petrochemical Company, this paper introduces the engineering characteristics of stereoscopic warehouses and the construction methods of goods shelves, stackers, conveyors, circular shuttles and dock levelers, and puts forward some suggestions on the project management of stereoscopic warehouses.

Walkthrough shall be conducted in the final stage of construction of petrochemical projects. As a crucial part of the walkthrough, electrical construction acceptance directly affects the project pre-commissioning schedule and the long-term safe and continuous operation in the future. The organization and acceptance of electrical walkthrough is very important. From the point of view of electrical engineers, this paper describes the inspection details of electrical walkthrough in petrochemical projects, and analyzes and discusses the common problems in walkthrough, providing reference for the design of similar projects in the future.