Being a kind of clean energy, liquefied natural gas (LNG) has been widely used. As important storage equipment, LNG storage tanks are becoming large in size, which is the development trend of the LNG industry. The insulation structure of LNG storage tanks is complicated, and the insulation characteristics of tank top, tank wall and tank bottom are different. Temperature field calculation is an important part of tank design. The parameterized modeling of large LNG storage tank was performed to achieve parameterized load condition input, which can improve the design efficiency greatly. This paper introduced the method for parameterized modeling. By adopting this method, it researched the temperature field and the effect of cold insulation under abnormal operation conditions of LNG storage tanks. Parameterized design can not only help engineers improve the cold insulation structure, but also improve the efficiency of analysis and calculation. It is the trend of tank design in the future.

Through establishing a mathematical model for calculating the heat transfer of styrene storage tank and taking the heat transfer calculation of tank shell, tank roof and tank bottom into account, this paper analyzed the heat transfer characteristic of different parts of the tank and presented the methods for calculating heat transfer of different directions. It studied the heat transfer characteristic of styrene storage tank under different working conditions. The research results have certain guiding significance for cold insulation design of styrene storage tanks in practical projects.

This paper studied the location dimension A of the saddle supports of horizontal vessel. By using finite element method, the axial stress, tangential shear stress and circumferential stress of specific sections were calculated under different A values. According to the calculation results, the stress changes with A values were analyzed. Then the method of adjusting A values to reduce the stress in the specified range was summarized. This provides reference for supports locating of horizontal vessels.

The energy efficiency of spiral plate heat exchangers has a direct impact on the overall energy efficiency of the units in petrochemical and refrigeration industry. Firstly, through theoretical analysis, it was determined that adopting energy efficiency index K/P which had a comprehensive reflection on both heat transfer and flow characteristics was suitable to evaluate the energy efficiency of spiral plate heat exchangers. Secondly, empirical approach was taken to research the energy efficiency level of four typical spiral plate heat exchangers and its influencing factors. The results show that the key structure parameters equivalent diameter de and distance column density had significant impact on K/P of spiral plate heat exchangers. The average values of energy efficiency indicator K/P of the prototype models at each flow rate were 1.00, 0.85, 1.49 and 1.97 respectively. There were big differences among the average values. And the level of energy efficiency had nothing to do with the heat exchange area; energy efficiency indicator K/P was affected by the flow velocity dramatically, and decreased with the increase of the flow rate, while it was less affected by the fluid inlet temperature; the energy efficiency level of the four prototypes was stable at different flow rates and different inlet temperatures. Lastly, a complete set of energy efficiency evaluation method for spiral plate heat exchangers was proposed. The energy efficiency of 285 spiral plate heat exchangers was calculated and the energy efficiency rating was divided according to the calculation.

Energy saving analysis of heaters is of great importance for petrochemical enterprises to ensure energy saving and safe operation. CFX software is adopted to carry out the numerical simulation of the three-dimensional flow field of GW5000 heaters. The k-ε turbulence model, PDF (probability density function) combustion model and Monte Carlo radiation model are applied in these calculations. The parameters of flow field, velocity field, temperature field, composition concentration field and heat flux density distribution on the tube surface are analyzed in detail. Meanwhile, tube wall distance optimization, burner online decoking, ash removal, fuel oil replacement, adding air preheater and other energy saving measures are also analyzed. These provide technical reference for researches on energy saving of heaters.

Rotary calcinator is common equipment used in catalyst production. Sudden stop accidentally happens in the production process. Improper handling may result in very serious consequences. Taking the electric heating rotary calcinator as an example, this paper introduced the structure, working principles and characteristics of rotary calcinators. Through stress analysis of the calcinator furnace cylinder at high temperature, it elaborated the possible consequences of furnace cylinder deformation and proposed the solution to the problem of furnace cylinder outage. By analyzing the causes for such failures, the paper put forth the preventive measures to avoid failures.

At present, China's petrochemical industry is actively promoting the basic management of equipment and has initially established an advanced equipment management system. This paper introduces the necessity and urgency of revising and compiling the Regulations for Maintenance and Overhaul of Petrochemical Equipment as an important component of the management system, the revising and compiling principles of the 2019 edition, the main technical characteristics, and its relationship with other management documents and so forth. The petrochemical industry continues to consolidate the equipment management foundation and improve the equipment management system. It's still the most basic work for the petrochemical industry to revise and compile the Regulations for Maintenance and Overhaul of Petrochemical Equipment continuously.

Real-time monitoring of equipment operating status is an important way to ensure the safe operation of equipment in petrochemical enterprises and improve production management. Based on the operation data of the dry gas seals of 4 compressors in the reformers, an online monitoring system for the health status of dry gas seals was established. Through real-time monitoring and analysis of 28 parameters (pressure, flowrate, temperature, vibration, liquid level and rotation speed), the operation fault alarm, failure cause analysis, health condition assessment, remaining service life prediction and predictive maintenance guidance for dry gas seals were realized preliminarily.

According to the sudden acting of the anti-surge control valve FRC7 and FRC8 in synthetic compressor of ammonia plant, it was determined that the compressor was close to the surge area, which caused fluctuation during the operation process of the unit. Through analysis of the FRC7 and FRC8, it was confirmed that the fluctuation was due to the take-off of 105-F safety valve. This led to the reduction of the FRC8 flowrate and its working point entering the surge area. Then the FRC8 opened automatically until the working point left the surge area and closed gradually. After the FRC7 flowrate increased, the anti-surge working point moved to the right quickly. After the PSV was back to normal, the FRC7 would move to the left and returned to its normal position. Although the working point didn't enter the surge area, the FRC7 still frequently opened because the point was close to the FRC7 spiral point.

API has published Dry Gas Sealing Systems for Axial, Centrifugal, Rotary Screw Compressors and Expanders, API Standard 692 First Edition in June, 2018. Although there are relative paragraphs about dry gas seal in API 617 and API 614, there wasn't dedicated standard for dry gas seal of centrifugal compressors before the publishing of API 692. The specifications executed in the past engineering practices were mainly based on the relevant chapters of API 617 and API 614, as well as manufacturers' specifications and engineering regulations of some engineering companies. Some of the above specifications are relatively broad in content, and some are formulated for specific devices or specific units. So they're not universal specifications. When using dry gas seal, many users install, maintain and operate the seal according to the manufacturers' specifications and previous experiences. Therefore, it's necessary for API to publish API 692 as a dedicated dry gas sealing standard. This standard contains very rich content and the requirements in it are high. The paper expounds some key contents of API 692 and analyzes briefly how API 692 is applied in the design of dry gas seal engineering of centrifugal compressors in refinery and petrochemical plants.

According to the national and industrial standards and specifications, this paper classified, analyzed and judged the inspection results such as the problems of coating failure, local corrosion, internal floating roof seal failure, damage of anti-rotation device and liquid level gauge fixing device, and damage of tank accessories found in tank inspection. The causes for the three problems including corrosion, failure and damage found in the inspection were analyzed from three key links covering design, construction and operation management. Feasible treatment measures were formulated and repair was carried out item by item. The potential safety hazards were eliminated completely; the quality and efficiency of maintenance was improved. These ensured the timely operation of the tank and provided reference for the inspection and maintenance of other similar tanks.

This paper introduces the problems of large vibration of No.2 bearing installed in the seat cylinder and the negative differential expansion value of the turbine exceeding the alarm value during the test run of the generator set in a coal chemical company. Through theoretical analysis and field measurement calculation, this paper obtained the impacts of additional blind force on the contact stiffness of the unit and the impacts of thermal imbalance caused by the design defects of shaft seal system on cylinder bearing vibration and steam turbine expansion difference through analysis. Aiming at the causes of the problems, the paper put forward the corresponding countermeasures and carried out technical revamp for the generator set. Thus the problems were solved thoroughly.

Gas turbines in petrochemical enterprises are closely connected with process systems, and their operational reliability is crucial to the normal production of petrochemical enterprises. If the gas turbine is shut down due to a fault, it will not only affect the balance of upstream and downstream materials, but also affect the stability of high-pressure steam pipe network in the enterprises. Through analyzing the causes of gas turbine shutdown, this paper found out the root causes of the failure and put forward appropriate improvement plan for a certain system or components of the gas turbines. Meanwhile, it summarized corresponding measures for operation and maintenance. These helped to improve the operational reliability of the gas turbines effectively and ensured the normal production of the enterprises. The system and component improvement plans described in this paper and the summarized operating experience are of big reference to the operation and management of gas turbines in other related enterprises.

Since the startup of the FCC II of certain company after overhaul, vibration of the flue gas turbine has been continuously rising. The vibration couldn't be improved obviously after operation adjustment and optimization. Online descaling of flue gas machine couldn't eliminate the abnormal vibration effectively. Finally, after repair and replacement of inlet deflection cone, the fault was eliminated and vibration restored to normal. Combining with the online condition monitoring of large units, this paper analyzes the impacts of operating condition adjustment on the vibration of the flue gas turbine. It discusses the problem of abnormal vibration of the flue gas turbine caused by high temperature creep deformation of the deflection cone. This provides reference for the disposal of similar problems in flue gas turbines.