Inner-perforated and outer-fluted copper-nickel tube is the most efficient and energy-saving heat transfer element in petrochemical industry. Due to the difficulty in its manufacturing and high performance requirements, the products and markets of such tubes are monopolized by foreign companies. The construction of Maoming EO plant realized the industrial application of the domestic inner-perforated and outer-fluted copper-nickel alloy tubes. This paper analyzed the heat transfer mechanism of inner-perforated and outer-fluted copper-nickel alloy tube and the influencing parameters. It compared the performance of the tubes and comments on its test plan. It also carried out calibration of the heat transfer mechanism of Maoming ethylene oxide second-effect evaporation tower reboiler. The paper demonstrated the feasibility and reliability of the application of the domestic inner-perforated and outer-fluted copper-nickel alloy tubes to glycol multi-effect evaporation system. This provides a solid and reliable basis for the domestication of the multieffect evaporator of megaton EO/EG plants.

In the construction of largescale cryogenic storage tanks, the air lifting operation of tank roof is the difficulty and key point in construction and safety management. Aiming at the previous problems of complex construction schemes, much materials used for improvement measures, and long construction preparation period, some improvements are made to the tank roof air lifting technology combining with years of practice, especially the balancing system and sealing system have been optimized. And good application effects have been achieved.

In this paper, computational fluid dynamics is adopted to simulate the flow field in the liquid distributor. The mass flow distribution and pressure drop at the outlet of the distributor in the horizontal and sway states were studied. The results show that after adding the sway at a certain angle, the deviation of the flow distribution increases from 6.75% to 21.24%. The nonuniformity of the outlet flow is increased significantly. Besides, sway in different directions has the same influence on the uneven distribution of flow. Increasing the height of the distributor inlet properly or optimizing the flow rate under the sway state can improve the uniformity of the liquid distribution of the liquid distributor under sway. The research results can provide data support for the structure optimization of the distributor under sway.

In order to evaluate the practical effect of annular gas distributor applied in airlift loop bioreactor, this paper studied the structure optimization of annular gas distributor and investigated the effects of opening direction, diameter and installation height of gas distributor on mass transfer performance. Meanwhile, it measured the performance parameters of the optimized annular gas distributor, such as oxygenation capacity, oxygen utilization ratio and power efficiency. The results showed that the oxygen mass transfer coefficient of the bioreactor was the best when the opening direction of gas distributor was 30° horizontally downward, the diameter was 0.5R and the installation height was 0.5R (R is the radius of the reactor guide shell) simultaneously. The results also indicated that the suitable gas rate was 2 m³/h, and at this point, the oxygenation capacity (O₂) was 0.14 kg/h with oxygen utilization ratio 26.03% and dynamic efficiency 2.52 kg/(kW·h).

The fatigue assessment of studs is of great importance to the safe and reliable operation of fatigue vessels. JB/T 4732—1995(R2005) Appendix C has provided a fatigue anaylsis method for studs on the fatigue vessels. In this paper, finite element method was adopted to carry out a fatigue analysis on the fastening studs used in the flange of the fatigue equipment, which verified the rationality of the stud fatigue assessment method in the project. Meanwhile, the paper presented reasonable suggestions for the use of the fatigue equipment studs.

During the implementation of GB 50341 edition 2014, problems with certain provisions and some errors in several calculation formulas have been discovered gradually. Combining with engineering design practice, this paper summarizes the main issues encountered, personal understanding and revision suggestions into 8 parts for analysis and discussion, which includes the characteristic of none weak roof-to-shell attachment (frangible joint) of self-supporting roofs, suitability of the formula of the roof-to-shell joint cross-sectional area (A) to austenitic stainless steels, an error appeared in the formula of the calculated failure pressure P_f, no need of the calculation thickness of the roof and the total required cross-sectional area (A_r) in roof-to-shell junction region for external pressure tanks compliant to the requirements of atmospheric tanks, the inconsistency between the body text and Appendix B of the standard on the calculation of the shell stability, too small calculated value of the design wind pressure on shells of external pressure tanks, shell stiffener quantity decrease instead of increase along with the ascending of the external pressure, and the modification suggestions for the calculation formula of ribs-stiffening domes.

In recent years, a variety of technical breakthroughs have been carried out to solve the coking problem in FCC unit, and good results have been achieved. At present, coking problems in slurry circulation system, fractionator bottom and reaction oil and gas pipeline have been solved effectively, yet coking problems in the top of settler and cyclone separation system of settler have not been fundamentally solved, which affects the longterm operation of catalytic cracking unit. This paper takes the coking phenomenon and characteristics of the settler of a number of enterprises in the catalytic cracking unit as the research object. Combining with the coking mechanism of the settler and the modification and application of the coking prevention technology, it explores and tackles the key problems. This provides technical support and guidance for solving the coking problem of settlers, and it also provides help for the long-term operation of the catalytic cracking units.

Graphite heat exchanger is classified into two types: block heat exchanger and tubular heat exchanger. The advantage of tubular heat exchanger is that if there is a leak, the specific location can be traced quickly, while the disadvantage is that the strength and rigidity of the tube are relatively low. The assembly of heat exchange tube and tube sheet is comparatively hard especially for heat exchange tubes longer than 6 meters with the size of φ32/φ22. This paper analyzed the assembly principles of the heat exchange tube of the impermeable graphite tube heat exchanger. Combining with the assembly problems of graphite heat exchange tube and baffle plate and the treatment experience of the adhesion problem of heat exchange tube and tube sheet encountered in actual work, the paper discussed the solution to the assembly problems of graphite heat exchange tube and tube sheet. Then it summarized the causes for the assembly problems of graphite heat exchange tube and the troubleshooting methods for the problems.

This paper elaborated on the design and selection process of the domestic large-scale product gas compressor. It conducted a theoretical analysis on the design key points such as the configuration and arrangement of the compressor unit based on the temperature control. Through combined configuration of two separated stages with internal cooler plus the coolant injecting into the compressor chamber, the outlet temperature of both stages can be controlled within 72 ℃ to ensure a safe margin for the highest temperature limit of 80 ℃. Meanwhile, the paper proposed an innovative parallel arrangement in which two compressors are driven by one steam turbine so as to improve the operating efficiency and reduce the operating difficulty of the entire unit. Finally, combining with the field operating data of the compressor unit from actual application, the paper verified the rationality of the program design and proposed the optimization direction.

This paper mainly focused on the study of the application of oil-free screw compressor in the recovery of low-pressure exhaust containing DMC from coal-to-ethylene glycol plant. It proposed and solved the key technical problems such as the process flow of compressor, selection of compressor type and spray medium, and the relationship between circulating spray volume, methanol replenishment volume, waste liquid discharge volume, and shaft power with the exhaust temperature. The optimal outlet operating temperature (78 ℃) under the design condition (inlet state of 0.002 mpaG /45 ℃ and discharge pressure of 0.25 MPaG) was obtained by the simulation software ASPEN, and the reliability of the study was verified by the data comparison of the actual operating device. The research results can be used to guide the application of screw compressors in the recovery of low pressure exhaust containing DMC from coal-to-ethylene glycol plant.

Hydrogenation burner is the key equipment of tail gas treatment unit. If local over temperature occurs on the shell, it will influence the safe operation of the device greatly. After determining the direct causes of the over temperature of the shell, this paper discusses the influence of higher temperature of the combustion chamber on the over temperature of hydrogenation burner shell from two aspects covering air distribution ratio of the combustion chamber and cooling steam flow value.

This paper introduces the development of equipment integrity at home and abroad and the necessity for implementing the equipment integrity management system. Meanwhile, according to the problems in the traditional equipment management of SINOPEC, the paper expatiates the pilot application and promotion of the integrity management in SINOPEC's refining and chemical sectors. The results indicate that the application of this management method has achieved notable progress. In addition, the paper also proposes work goals and hopes for the further promotion of the equipment integrity management system in the future.

In recent years, X80 steel has been widely used in pipe transportation projects. At present, the welding methods for X80 steel are mainly manual welding and semi-automatic welding, and the efficiency is comparatively low. This paper mainly introduces the results of research on the principles and technology of X80 steel all-position motorized welding equipment. It elaborates on the process parameters of all-position motorized welding with flux-cored arc welding obtained through multiple tests. The paper also compares and analyzes the physical and chemical properties. This research can provide reference for the implementation of X80 steel all-position motorized welding.

During the operation of the 20 000 m³ rolling curtain type dry-seal gas holders, pistons hit against the inner walls of the gas holders, resulting in equipment accidents covering damage of diaphragms & walls, severe deformation of T-fence and serious gas leakage. Through analysis and demonstration, it is considered that the continuous rainstorm submerged the steam pipelines and caused sharp decrease of steam temperature, so the units were forced to shut down; after the shutdown, all devices vented intensively in large quantities, resulting in large fluctuations in the amount and pressure of gas entering the gas holders. This caused violent shaking of the piston. After the occurring of the abnormal operation of the piston, no effective measures were taken to close the inlet and outlet valves in time to stabilize the piston as soon as possible, which aggravated the degree of the damage to the gas holders. Aiming at the damage to the gas holders, effective repair plans were developed and necessary monitoring devices were added so as to ensure the normal operation of the gas holders.