Crosswind resonance not only affects the technological operation of high-rise tower, but also leads to destruction due to strength reduction. Based on engineering practice and taking safety, reliability and economics into account, some key preventive measures are put forward for design, fabrication and installation of high-rise tower so as to prevent failure of crosswind resonance acting on high-rise tower and ensure safe operation of the tower. It is considered that the most economical and effective measure is that vibration analysis of the tower should be carried out carefully during the design phase and some anti-vibration measures should be taken according to the analysis results. This paper also points out that the weld height has an effect on the fatigue life of butt-weld between the skirt and bottom head.

This paper summarizes the seismic damage characteristics of petrochemical static equipment. It analyzes and compares GB/T 50761—2018 Standard for seismic design of petrochemical steel equipment from such aspects as seismic fortification and importance category, earthquake action, load combination and allowable stress, seismic system design and construction measures. The paper elaborates the reasons for the preparation of the corresponding clauses of the standard. Meanwhile, with reference to the seismic design codes at home and abroad, it presents an outlook on the development of GB/T 50761 from the aspects of ground motion, multi-level performance seismic design and limit state method and so forth.

The application status of the third stage cyclone separator in FCC unit is introduced, and the main structures and existing problems of vertical multitube type third stage cyclone separator and horizontal multitube type third stage cyclone separator are expounded. And the main structures and advantages of BSX type third stage cyclone separator are presented. The BSX type third stage cyclone separator has been successfully applied in the FCC unit in one refinery. The industrial operation results showed that after using the BSX type third stage cyclone separator, the catalyst concentration in the outlet flue gas of the third stage cyclone separator was 90 mg/m³ (normal condition, the same below) and the large particle size (>10 μm) catalyst concentration was 1.52%(w). The overall separation efficiency of the BSX type third stage cyclone separator was 72%, and this indicated that the separation performance was excellent. The catalyst concentration and particle size in flue gas at the inlet of flue gas expander were far lower than the control index. The application of the BSX type third stage cyclone separator can provide good guarantee for the long-term safe and stable operation of flue gas expander.

Swirl tube is the separation unit of cyclone separator for purification of high-sulfur natural gas, which is the key internal component to achieve efficient gas-solid separation. Based on CFD-DPM method, the structural parameters of cyclone tube are optimized. Firstly, the key structural parameters are characterized to seven design variables, and the optimized physical model is established. The structural parameters and various models are set within the optional range by means of uniform design method, and the flow field distribution, particle separation trajectory, pressure drop, separation efficiency and other flow information are obtained by numerical simulation. In this paper, nondimensionless parameter Y is proposed as the optimization objective parameter, which takes into account the influence of separation efficiency and pressure drop comprehensively, and can effectively help to obtain the model and structural parameters with the highest separation efficiency within the allowable range of pressure drop. The detailed flow information of the optimal structure, such as flow field and separation trajectory, is analyzed in detail, which can provide important reference for the optimization design of the primary swirl tube.

Taking the TSY500-400-895 centrifugal pump as the research object, this paper carried out the numerical calculation and cavitation simulation of the internal flow of the centrifugal pump by using ANSYS CFX software and predicted the net positive suction head critical (NPSH_r) of the centrifugal pump under the design condition of Q=2 700 m³/h. On this basis, the structural parameters of the centrifugal pump impeller were optimized. After optimization, the NPSH_r of the pump was reduced by 1~1.5m, and the cavitation performance of the centrifugal pump was improved effectively. The cavitation performance test of the centrifugal pump before and after optimization was carried out on the test bench, and compared with the predicted results of the numerical simulation. The results show that the predicted value of the NPSH_r was basically consistent with the test value, which indicated that the use of CFD software for cavitation analysis could guide engineering practice efficiently.

A nitrogen circulating fan with the form of integral assembly centrifugal fan is needed for the acetic acid cogeneration plant from coal to hydrogen in a refined and chemical company. Its function is to supply gas to the process pipeline before the whole process operation and sweep the catalyst needed for the reaction into the reactor, and to complete the preparation work before the process. The equipment is a very critical part of the process flow, and its continuous and stable operation is crucial, so it has been using products of imported brands. The price of similar imported equipment for this device is very high and the manufacturing cycle is long, which cannot meet the site schedule requirements. Under this background, an integral assembled centrifugal compressor is developed to replace the imported one. The main research content covers: flow parts design and numerical simulation performance prediction; rotor dynamics calculation to improve the operation stability of the whole machine. After the design is completed, air medium test is used to verify the aerodynamic performance and mechanical operation results. The test results show that all the indexes meet the design requirements.

With the development of private enterprises to the upstream of petrochemical industry, large-scale ethylene projects built by private enterprises are gradually increasing. This paper analyzes the characteristics and difficulties of implementing large-scale ethylene projects in private enterprises and the necessity of strengthening equipment design management. Meanwhile, the paper takes such measures as adopting PDCA cycle management method, value engineering theory and standardized, integrated and modular design means to optimize equipment design management in an ethylene project. These measures can provide reference for the design management of large ethylene projects constructed by private enterprises.

The unsound standard system exists in the design and manufacture of equipment for LNG receiving stations in China, which affects the efficient implementation of project construction and becomes the hidden trouble for stable and excellent operation of the equipment. Aiming at these problems, this paper analyzes the standardization development strategy, LNG receiving station planning, concentration of construction units, self-owned technology and equipment development. And it is concluded that the equipment standardization conditions are ripe. From the aspects of processing capacity, technical standard, material selection, performance index and inspection and acceptance, the paper puts forward the standardization scheme for cryogenic tank plate, compressor, unloading arm, in-tank pump and gasifier.

It is difficult to implement the regular nondestructive testing methods for the in-service petrochemical equipment and pipelines with placing nozzle joint with reinforcing plate (branch connection joint). Aiming at this status quo, the simulation process of phased array ultrasonic testing is adopted to analyze and study such welded joints. And the developed testing process is verified on the simulation test block. The results indicate that the detection effect is good. This process provides a new technical means for the detection of fillet joints of placing nozzle with reinforcing plate.

Aiming at the problems of poor safety and reliability and imperfect protection configuration of traditional 10 kV transformer in bad environment area, a transformer with fully oil-immersed sealing is designed with the integration of transformer body, high and low voltage circuit breaker, monitoring and protection control system in this paper. The electric and temperature field of the transformer is simulated and analyzed by ANSYS simulation software. The heat dissipation system, monitoring and protection control system and internal structure of the intelligent transformer are designed. The intelligent distribution transformer prototype is developed, and the feasibility of the product is verified by delivery test and field operation. The intelligent distribution transformer, with the advantages of high integration, high reliability and high intelligence, has a better application prospect.

As the leading core plant in the chemical industry, ethylene plant is large in size; the process involved in it is complex and the construction period for it is long. And the schedule management of large tower hoisting plays a decisive role in the construction progress of the whole ethylene plant. Through scientific and reasonable planning and management, the design, procurement, manufacturing, transportation of the large tower is fully optimized; and modularization and hoisting management of all the installation work of tower piping, ladder platform, insulation and cooling, electrical instrumentation and other related parts of the tower are also fully optimized, which can provide guarantee for the overall construction schedule of ethylene plant and the project.

Leakage occurred in the pipe plug of the tube bundle of air cooler in an oil refinery during the start-up of the unit and individual pipe plugs were found to be fractured during the tightening process. Through macroscopic inspection, chemical composition analysis and metal testing of the fractured pipe plugs and the new pipe plugs of the same batch, the causes for the fracture were identified. Meanwhile, solutions were proposed with reference to peer cases. This paper can provide ideas and reference for solving related problems in similar equipment.

This paper introduces the basic structure of the front filter of quench oil pump in ethylene plant before revamping and the failures occurring during long-term operation. The filter imperils the safety of the plant and its long and reliable operation. Based on the cause analysis of the systematic failures of the filter element, the improvement schemes are formulated and implemented from the aspects of vibration control, improving seals and bearings, changing the structure of the scraper assembly, and increasing the strength. Meanwhile, during the installation process, the data of the revamping design are rechecked precisely, thus realizing the systematic revamping of the vulnerable parts of the original filter's automatic scraper filter element structure. The revamped filter can satisfy the function of long-term automatic coke-cleaning, and realize long-term safe and reliable operation.

This paper focuses on analyzing the corrosion mechanism of evaporative heater for ammonia desulfurization. The main corrosion causes of the evaporator-heater for ammonia desulfurization are chloride ion pitting corrosion and erosion corrosion of ammonia sulfate slurry crystalline particles. By comparing and analyzing the use of 316L, ta2 and SAF 2507 in evaporative heater, the paper puts forward some suggestions for the optimization of material selection for ammonia desulfurization evaporative heater. Meanwhile, combined with the actual operation experience, measures such as changing the pH value of circulating fluid and reducing the concentration of chloride ions in circulation fluid, controlling the solid content of the slurry entering the evaporative heater and adding anti-wear bushings at the inlet of the heater tube bundle are proposed, which can effectively slow down the corrosion of ammonia sulfate slurry on the evaporative heater tube bundles.