The heat transfer of nozzles on the roof of LNG cryogenic tank is studied according to the basic theories of heat transfer, including the analysis of the heat transfer process, the simulation of nozzle temperature field using ANSYS and the sensitivity analysis and optimization of nozzle size and structure parameters. As it turns out, the primary factor affecting the temperature at the joint between thermal sleeve and tank roof plate is the length of the thermal sleeve; which, together with the external insulation thickness and the insulation length of the thermal sleeve, are the major factors affecting the external surface temperature of the thermal sleeve. The analyzing methods and results can serve as a theoretical basis for the structure design of similar nozzles on the roof of LNG cryogenic tank.

In order to produce national VI ethanol gasoline components and meet the requirements of cleaner production, more enterprises are considering increasing the proportion of light naphtha with more iso-paraffin in the gasoline pool to increase the octane number and improve the octane distribution. Several methods for increasing the octane number of light naphtha are introduced, the de-isopentane separation method and the selective adsorptive separation method are analyzed in detail, and the impact on refinery-wide gasoline pool and the feasibility of improving economic benefit are discussed.

Temperature runaway model was built for EBHP decomposition, and temperature runaway curves were drawn for two working conditions, i.e., with or without cooling system. The inhibiting effect of EB flush and emergency cooling water quench on temperature runaway was analyzed. The results showed that the EBHP temperature runaway model could predict the change of temperature with time. The temperature alarm value was 120℃ and the interlock temperature was 140℃. A 630/300 kt/a SM/PO unit was taken as the example, and the EBHP flow rate was assumed to be 1000 t/h. The temperature runaway could be inhibited rapidly and effectively when the EB flow rate was equal to 30% of the feed or the emergency cooling water flow rate was equal to 6.5% of the feed. This research has provided basis and reference for the safety design and stable operation of the unit.

Paving design of petrochemical plant area include ground design and ditch design. Compared with conventional paving design, the paving design of petrochemical plant area need to consider some special requirements such as anti-corrosion, seepage prevention, fire protection and the loading of heavy load truck. The engineers shall comprehensively summarize the requirements and ideas of paving design according to relevant design codes and standards for paving design based on national and international engineering experiences, so as to improve the accuracy and efficiency of paving design.

This paper introduces the common calculation methods for exposed steel column base plate in petrochemical industry. In order to minimize the thickness of steel column base plate, finite element analysis is performed by using the same plate edge support assumptions as the classical design approach for areas subjected to pressure based on the analysis of the characteristics of column base plate and the research on design methods, and the calculation method, formulas, design limit values and design considerations for areas subjected to the tensile load as well as the pressure are presented. Verification of the base plate under various loading conditions indicates that the calculation method and formulas proposed in this paper are safe and reliable, and are easy to use for engineers.

To fully implement green development concept and build environmentally-friendly projects, the construction of green construction site is of vital importance. Implementing green action requirements and clarifying construction responsibility is the core approach to strengthen the implementation of green strategy. This article takes the concepts of energy saving and environmental protection as the core, discusses the specific requirements for green construction site, clarifies the responsibilities of all parties, and explains the organizational measures and system construction during the construction as well as some specific technical measures including resources and energy saving, waste gas, dust and noise control, solid waste disposal, and water and soil protection.

A large amount of low temperature waste heat in SMR unit is wasted, and currently some refineries use hot water to recover this heat, but its secondary use is affected by seasons, so the low temperature heat recovered by hot water is not used widely. In this paper, Organic Rankine Cycle is combined with SMR unit, the low temperature heat of shift gas is used to evaporate the organic media, and the organic media is sent to the turbine for power generation, not only reducing the temperature of shift gas, but also reducing the number of air coolers. The power generated can be used to significantly reduce the power consumption of SMR unit, thus reducing the energy consumption of the unit.

Payment issue is one of the core issues of project management, which affects project cost, schedule, cash flow and other aspects. As the widely used contract terms, JCT terms and FIDIC terms have detailed provisions on payment management. However, after the JCT and FIDIC terms were updated successively in 2016 and 2017, there are few studies and comparative analysis on the two new versions. Aiming at the payment issues, this paper selects the Design-Build contract mode to perform comparative analysis based on these two contract terms.

CNOOC Zhongjie Petrochemical Co., Ltd. introduced prime G+ selective hydrodesulfurization process and catalyst developed by French Axens Company to reduce the sulfur content of FCC gasoline and to produce the blending components of national VI gasoline. The unit was successfully started up in 2016. In 2017, the arsenic content of the FCC gasoline was higher than 90 μg/L. Subsequently, a new arsenic removal reactor was added in the unit, and Axens’s arsenic removal catalyst was selected. According to the statistics of operation results, good arsenic removal effect was achieved, the subsequent use requirements of desulfurization catalyst were met, the service life of the unit was prolonged, and there was little effect on the properties of hydrogenated gasoline.

Two-stage Claus plus hydrogenation reduction absorption and incineration process was used in conventional sulfur recovery unit, and the SO2 concentration of flue gas could not meet 100 mg/Nm3, the special emission limits stipulated in GB31570-2015 Emission Standard of Pollutants for Petroleum Refining Industry. At present, sodium desulfurization, ammonia desulfurization and SO2 recovery processes can reduce the SO2 concentration of flue gas emissions from sulfur recovery unit to no higher than 100 mg/Nm3. Through the comparison of these three processes from the aspects of project investment, production cost, energy consumption, operation risk and operation difficulty, the advantages and disadvantages of different processes are obtained.

The cold insulation effect of LNG terminal is directly related to safe and stable production. In order to evaluate the present cold insulation situation of cryogenic pipelines, a study was carried out from two aspects. Firstly, the cold loss of pipeline was measured and calculated by using surface temperature and heat flow meter method; Secondly, taking long-span straight pipe as an example, its strength and limit load were analyzed by using finite element analysis method. Through on-site measurement and calculation, it was found that out of the 135 detection points the ratio of cold loss exceeding allowable range was as high as 71.9%, and the surface temperature of all pipelines was lower than the dew point temperature. This means that some measures should be taken to reduce the cold loss. In addition, through numerical simulation calculation, it was considered that the pipeline load was within the allowable range, and no obvious pipeline deformation was found in field verification.

The third-party construction damage of oil and gas pipeline is becoming more and more serious. It is necessary to analyze the failure probability of pipelines under third-party construction. So a quantitative failure probability calculation method based on vulnerability theory was proposed. A risk factor evaluation system was set up based on 4M system, the analytic hierarchy process was used to calculate the weights of factors and the weights of expert judgment ability, the expert judgment language was quantized by introducing triangular fuzzy number, and the probability of event risk was obtained by calculating the fuzzy number. Five parameters including external load, pipe diameter, pipe wall thickness, pipeline burial depth and service life were selected to establish vulnerability function from the two aspects of hazard resistance and hazard intensity. The probability of vulnerability was calculated by structural reliability theory. The example analysis shows that this calculation method can effectively calculate the failure probability of pipelines under third-party construction, and provide some technical support for the safety management of oil and gas pipelines.

Artificial neural network, the cutting-edge technology in the field of artificial intelligence, is widely used in the production and operation of petrochemical enterprises. This paper introduces the basic principle and algorithm classification of artificial neural network technology, discusses the application progress of artificial neural network in the operation optimization, fault diagnosis, energy saving and emission reduction, safety early warning and data prediction of petrochemical enterprises, puts forward the focus of the application of artificial neural network in petrochemical enterprises, and looks forward to the development trend of this technology in petrochemical enterprises.

This paper introduces the development history of industrial buildings in the past 200 years. Reinforced concrete frame technology and steel structure technology as well as large span structure, grid structure, membrane structure, composite plate and other new technologies, new structures and new materials are applied to the buildings in petrochemical field. Looking into the future, while ensuring its advancement, rationality and safety, the development direction of industrial buildings include the artistic tendency, humanistic tendency and brand concept, the harmonious relationship between the buildings and the surrounding natural environment as well as the humanistic environment, and even the role as city signs or the transformation into artworks after the harmless treatment of emissions.

This paper introduces the characteristics of polycarbonate, explains its main application fields, and introduces two main industrial methods for synthesis of polycarbonate, i.e., interface polycondensation method and melt transesterification method. The features of these two methods are discussed in detail from the aspects of production process, raw material consumption, advantages and disadvantages of process flow and future research and development direction, and the two industrial production processes are compared and analyzed from the aspects of reaction principle, reaction conditions, reaction features, and safety and environment requirements. The distribution of polycarbonate production capacity in China by 2019 are summarized, and the development direction of China’s polycarbonate industry is prospected.