Search Result

Select

Proposition and Application of Nonlinear Multi Factor Coupling Accident Cause Model

Zhang Yuanyuan， Zhang Juwei， Liu Xiaopei

Abstract （335）

HTML

PDF （1223KB）（212）

In view of the shortcomings of the existing accident causation models, such as simple listing and superposition of causative factors, not considering the coupling effect between factors, unable to make quantitative analysis and so on,a new nonlinear multi⁃factor coupling accident causation model was proposed and applied to the prevention of oil depot accidents. In the new model, the calculation formulas of the main influencing factors, the influence coefficient and the multi factor coupling rheological nonlinear damage were proposed. The most prominent feature of the model is that it can distinguish the dynamic influence of the rheology of the main influencing factors on the damage of the complex system under the coupling action of multiple factors. MATLAB software was used to simulate the changing state of the oil depot system after single factor rheology, main influencing factor rheology and non⁃main influencing factor rheology. The results show that the main factor affecting the safety of oil depot is the lack of safety consciousness,and the lack of safety consciousness of oil depot personnel has the greatest influence on other factors. For oil depot accident prevention, according to the nonlinear multi⁃factor coupling accident cause model proposed in this paper, it is necessary to take effective measures to control the main influencing factors and seize the main time nodes.

2021, 41 (2): 73-78. DOI: 10.3969/j.issn.1672-6952.2021.02.013

Select

Research on Key Technologies of Risk Monitoring and Early Warning System for Hazardous Chemicals Based on CPS

Shi Feng， Zhang Baocun， Du Jiuyi， Zhang Yu， Kan Zhe

Abstract （313）

HTML

PDF （1969KB）（143）

In the petrochemical process, a risk monitoring and early warning system for hazardous chemicals is designed based on CPS technology to solve the problems of monitoring, identification and prediction of major hazard sources of hazardous chemicals. The system is divided into three layers: physical layer, network layer and decision layer. At the physical layer, the front⁃end hazardous chemicals data collection, data transmission and local storage are completed, and the data are classified and transmitted to the cloud server in real time. The data passes through the network layer and is identified by the decision⁃making layer for major hazard sources and early warning for hidden dangers of hazardous chemicals. Finally, the whole data is displayed. Genetic algorithm and neural network algorithm are used in the decision⁃making level for risk assessment of major hazard sources. Simulation experiments show that this method can accurately complete the risk assessment of major hazard sources of hazardous chemicals. In the laboratory, the remote monitoring and early warning system for hazardous chemicals based on CPS is proved to have the capability of hazard source identification and risk hazard prediction through actual verification.

2020, 40 (6): 85-90. DOI: 10.3969/j.issn.1672-6952.2020.06.015

Select

Application of Modified Triangle Fuzzy Fault Tree Algorithm in Accident Prediction of Chemical Production

Zhang Yuanyuan， Zhang Juwei， Zhao Aibin， Yao Yantao

Abstract （265）

HTML

PDF （1578KB）（95）

Based on the traditional prediction model of triangular fuzzy accident tree, which had the defect of large error caused by linear approximation, the source of error was analyzed according to the truncated set theorem, and the improved algorithm for drawing membership curve of triangular fuzzy number of accident treetop events was given according to the representation theorem. Matlab software was used to program, the modified and traditional triangle fuzzy accident prediction algorithms were used to predict the electrostatic accumulation accidents in oil depots, and calculated the fuzzy importance of 8 causes. According to the calculation results, compared with the traditional algorithm, the average error value of the fuzzy importance calculation of the eight basic events is reduced by 11.91%，which shows that the modified algorithm greatly optimizes the shortcomings of the traditional algorithm.

2020, 40 (6): 64-71. DOI: 10.3969/j.issn.1672-6952.2020.06.012

Select

Research on the Affecting Factors of Mechanical Properties of FRP Tube Concrete Axial Column

Wang Xianyi, He Jupeng, Xie Jing, Zhao Dewang, Zhang Yunfeng

Abstract （567）

PDF （7732KB）（203）

This paper conducted an axial compression test on 32 group of FRP concrete composite structure with 3 kinds of section forms (FRP pipe-concrete-steel section, FRP pipe-concrete-steel pipe and hollow FRP pipe concrete). The artificial neural network was used to analysis the experimental dates. The increase of ultimate bearing capacity values was used as mechanical performance evaluation indicators. The effects of five parameters on the mechanical performance, such as the thickness of FRP pipes, the pipe diameter, the hollow ratio, the concrete strength and the steel ratio, were the emphasis of the investigation. The research results show that the most influential parameters of mechanical performance are the thickness of FRP pipes and the pipe diameter, followed by concrete strength, the difference between the three is insignificant, and the influence of hollow ratio and steel ratio are the lowest. Both the increase of the thickness and diameter of FRP pipe, The mechanical performance is significantly improved. The overall trend of ultimate bearing capacity values is decreasing with increasing the concrete strength. But under different conditions, the trend of ultimate bearing capacity values is also increasing or increased at first and then decreased, which effected by the concrete strength. With the increase of the hollow ratio and steel ratio, the overall mechanical performance decrease and the downward trend is relatively slow. The mechanical performance of small wall thickness member is decreased significant with the increase of hollow ratio. But the impact of large wall member components is not obvious. With the increase of steel ratio is significantly decreased the mechanical performance of small thickness and high concrete strength member, but the mechanical performance of big thickness and high concrete strength member is significantly increased.

2018, 38 (1): 84-92. DOI: 10.3969/j.issn.1672-6952.2018.01.015

Select

Mathematical Analysis of Incompatible Problems in Security Domain

Zhang Yuanyuan, Zhang Juwei, Zhao Bin

Abstract （468）

PDF （1127KB）（212）

In order to solve the problem of complex system in the security field by theory and computer， the objectives, conditions, and characteristics of incompatible problems in the field of security were defined from the perspective of acceptable security state value and the four elements of security on the basis of studying the theory and method of inconsistent problems, and the corresponding mathematical model was given. The key conjugate elements for the extension of the incompatible problem were defined: The hard part was the safe person and the safe thing, and the soft part was the safe society and the security system. The mathematics strategy to solve the incompatible problems in a gas station, the result showed that the application of this method could solve the problem of the safety of the gas station and provide the new ideas and the basis for safety performance management.

2018, 38 (1): 55-59. DOI: 10.3969/j.issn.1672-6952.2018.01.010

Select

Numerical Simulation of Hydrogen Sulfide Diffusion Rule

Zhang Yuanyuan，Sun Tie，Wang Li，Zhang Juwei

Abstract （757）

PDF （7469KB）（272）

Once hydrogen sulfide is leaked and diffused, the consequences are unimaginable. In order to master the law of hydrogen sulfide diffusion, the diffusion law of hydrogen sulfide under the influence of source strength, wind speed and source height was numerical simulated by MATLAB and VC++ software. The simulation results show that at night, when the source strength increases, the downwind direction diffusion range increases under the leakage source, the hydrogen sulfide mass concentration gradient increases in the diffusion area, and when the source height increases, the maximum width of the downwind direction diffusion area under the leakage source becomes narrower and the area becomes smaller. During the daytime, when the sunlight intensity is low and the wind speed is greater than or equal to 4 m/s, the downwind direction diffusion range of the leakage source decreases as the wind speed increases, and the hydrogen sulfide mass concentration gradient decreases in the diffusion area. Increasing the source height and wind speed is beneficial to reducing the mass concentration of hydrogen sulfide and the hazard. The research results can provide a basis for accident prevention and emergency rescue.

2018, 38 (06): 59-64. DOI: 10.3969/j.issn.1672-6952.2018.06.011

Select

Application of DEMATEL Algorithm in Identification Key Factors of Complex Security System

Zhang Yuanyuan，Chen Xiangbin，Wang Meng，Zhang Juwei，Zhao Bin

Abstract （497）

PDF （1295KB）（193）

The DEMATEL algorithm is an algorithm for analyzing the relationship between the influencing factors of complex systems. The algorithm has important application value for identifying the key factors of complex security system. First, on the basis of the DEMATEL algorithm, according to the knowledge of cognitive psychology and the status quo of the safety management of a gas station, the complex gas station safety system is divided into 4 subsystems, and further refined into 31 specific factors. Secondly, according to the DEMATEL algorithm, the MATLAB program is compiled to divide the cause factors and the result factors, and the influence degree, cause degree and center degree of each factor are calculated. Finally, the location of the key factors are displayed intuitively by drawing the cause results diagram. The results show that the information channel interruption, lack of recognition and information uncertainty, contingency plans and response defects are the key factors affecting the safety of gas stations. The longterm solution for gas station safety management is to control these 4 factors.

2018, 38 (05): 61-66. DOI: 10.3969/j.issn.1672-6952.2018.05.011

Select

Prediction of Mini Zone Bathtub Shape Fire Accidents

Zhang Yuanyuan, Liu Xiaopei, Shi Meijing

Abstract （473）

PDF （2405KB）（183）

Because there is a large error defect of predicting the severe fluctuating fire data by traditional grey forecasting model, the article expends the original data sequence of grey prediction model using Taylor formula and expends Lagrange type remainder, which modified the traditional grey forecasting model and improved the traditional grey prediction algorithm. The article used Matlab software to program, and used the traditional gray prediction algorithm and improved gray prediction algorithm,respectively.Then the article selected three sets of data to predict aiming at the mini zone bathtub shape fire accident. As the results show that: modified grey forecasting model prediction curve gives satisfactory accuracy comparing to the characteristic of bathtub curve, which has a high consistency with the original data.And the poor quality, large error and low accuracy is improved. Compared with the traditional grey prediction model, the error of the improved grey prediction model has reduced 86.59%, 55.32%, and 55.70%, respectively. The prediction results of the improved grey prediction model can meet the requirements in three aspects: accuracy, relative error and correlation.

2018, 38 (03): 84-88. DOI: 10.3969/j.issn.1672-6952.2018.03.016

Select

Application of Fuzzy Accident Tree Method in Safety Evaluation of Hydrocracking Unit

Zhao Chuanqi， Zhang Juwei， Zhang Yuanyuan， Wangchen Yushu

Abstract （562）

PDF （1930KB）（177）

The probability of a number of basic events itself was uncertain and fuzzy when the traditional FTA method was used in the practical quantitative analysis quite. It was difficult to obtain the exact probability from failures, which violated the premise of exact probability selected. In order to solve the traditional fault tree analysis (FTA) of the probability the basic event fuzzy and uncertain problems, the concept of fuzzy theory were introduced, and the fuzzy probability was used to deal with the basic events lack of statistical data. The basic events of fuzzy probability were described by using a clear triangular fuzzy number, the fuzzy probability distribution of top event layer by layer was obtained, and the fuzzy importance of each basic event was determined by using fuzzy numbers value method. And the sort of top event of failure factors was obtained, the main factors influencing the accident were identified and effective measures from fundamentally preventive and the key points to control the top event were proposed.

2018, 38 (02): 61-65. DOI: 10.3969/j.issn.1672-6952.2018.02.013

Select

Simulation and Design of Shale Flashing Retorting Recovery Oil and Gas

Zhang Yuanyuan， Cao Zubin， Han Dongyun

Abstract （533）

PDF （3086KB）（393）

According to the process characteristics of flashing retorting process, a set of suitable for high temperature oil washing oil vapor recovery technology was designed, combined with pilot plant field data, using plus Aspen software for process simulation. Shale oil was separated to heavy oil, heavy diesel oil, light oil fraction and gasoline fraction by the oil washing method. The process produced steam as byproduct and it had the advantages of high recovery rate, low oil loss, low energy consumption, and could effectively avoided environmental pollution. Using this process, the rate of gas recovery could be greatly enhanced: crude oil washing tower could recycle 39.7% of the oil steam, heavy diesel oil washing tower could recycle 60.3% of the oil steam. Compared with the traditional process, it could improve the recovery rate of 10%-20%.

2016, 36 (1): 20-26. DOI: 10.3696/j.issn.1672-6952.2016.01.005

Select

Experimental Analysis of Ductility of FRP ConcreteContin-Uous Beam Ductility

Zhang Yunfeng， Han Feifei， Chen Jianan， Wang Shuwei， Lu Zhaohong

Abstract （455）

PDF （1839KB）（306）

n this paper, according to the domestic and foreign scholars on the research status of FRP concrete continuous beam, the mechanical performance of FRP and loading characteristics of FRP concrete beams, the following aspects are worked. This paper makes flexural property research by means of 3 FRP continuous beams and 2 FRP simple supported beams test, this test considers reinforcement ratio impact on the beams and measures cracking load, crack propagation law, midspan and support strain, and summarize the loaddeflection of FRP concrete continuous beams. Basing on the results of the test and the research of scholars at home and abroad, this paper calculates and analysis the ductility of the FRP concrete beams.

2015, 35 (1): 50-53. DOI: 10.3696/j.issn.1672-6952.2015.01.013

Select

The Comparison of MIR and NIR Spectroscopy Technology and  Their Application in Analysis of Hydrocarbon Source Rocks

ZHANG Yujia

Abstract （307）

PDF （1866KB）（237）

Nearinfrared (NIR) and midinfrared (MIR) spectroscopy are powerful tools for quantitative analysis of material composition due to its rapid, nonpolluting, nondestructive characteristics. The two infrared spectra show different characteristics. The advantages and shortcoming of the two spectra were analyzed and compared in the view of the mechanism, spectral analysis models and spectral instrument designs of the two spectra. This provided a good method for the selection of suitable spectroscopy. The hydrocarbon source rocks were analyzed by both midinfrared spectroscopy and nearinfrared spectroscopy. The wavelet multiscale direct orthogonal signal correction (WMDOSC) method was used to preprocess original NIR and MIR spectra. The results show that this method can significantly improve the accuracy and stability of the nearinfrared spectral analysis model, and the results of nearinfrared spectral analysis model are consistent with that of midinfrared one.

2013, 33 (3): 19-23.

Select

WasteHeat Utilization Technology of Residual  Saturation Water in Steam Injection Boiler

YU Huipeng， LIU Baoyu， LI Mingchuan，ZHANG Yuting

Abstract （493）

PDF （2073KB）（262）

Steam injection boiler is one of the main power and energy consumption equipments in oil thermal production. Generally, the high temperature saturated water enthalpy which is separated by the steam separator is used through the heat exchanger. However the water treatment system of the steam injection boiler is so simple and the separated saturated water is rich in calcium，magnesium and other ions which are easy to foul pipe surface and affects the heat transfer efficiency of the heat exchange equipment. Comparing with the case of no using the equipment, the screw expander which is of a selfcleaning ability recycled the waste heat of the saturated water, which can improve the thermal efficiency by 10.2% and save about 4.56×107 kW·h amount to 18 422.4 t of standard coal in the service period. The effect is significant.

2013, 33 (2): 48-51.

Select

Fluctuation of the Soil Temperature Field of Batching Transportation of Cold and Hot Crude Oils

YANG Yunpeng，LIU Baoyu， ZHANG Yuting， ZHANG Ning， HAO Jing

Abstract （364）

PDF （3120KB）（208）

n order to more accurately determine the crude oil batching transportation temperature fluctuation, the soil temperature field around pipeline insulation surface drift was studied. For variation characteristics of soil temperature field around underground pipeline in the process of batching transportation of cold and hot crude oil, the non steady heat transfer model was established, and soil temperature field in different period of batching cycles and moments was numerically simulated and analyzed by using CFD software in the process of crude oil batching transportation. The results show that the drift on the thermal insulation surface of soil temperature field has certain regularity, and adiabatic surface with crude oil batching transportation time shows periodic drift, drift period and period of batching cycles of cold and hot oil transportation were the same; drift cycle of thermal insulation surface of soil temperature field and the scope are related to cold and hot cycle on the batch transportation of oil.

2013, 33 (1): 53-56.

Select

Numerical Simulation of Oil-Gas Separation in Tee Pipeline

JIANG Feng-li， FAN Kai-feng， WANG Wei-qiang， ZHAO Peng， ZHANG Yuan-li

Abstract （449）

When the gas-liquid two-phase flows through tee pipeline, the distribution of two phase in two branch pipes is always uneven. There may be only gas branch in pipelines when it is serious, while the other export tube may be full of liquid. The numerical simulation on oil-gas two phase fluxion in different time by CFD was made and the oil and gas separation characteristics in branch pipes were get. The results show that there will be gas-liquid separation phenomenon in branch pipe when the oil and gas flow through branch pipe of tee pipeline, and close to the mouth branch the separation phenomenon is obvious. There is almost no separation phenomenon in certain distance of the branch mouth.

2011, 31 (4): 52-55. DOI: 10.3696/j.issn.1672-6952.2011.04.014

Select

Effects of KI on the Corrosion Resistance of Electroless Ni-P Plating Coating on Aluminum Alloy

LIANG Ping, ZHANG Yun-xia

Abstract （406）

PDF （335KB）（306）

The effect of KI on the surface micrograph of electroless Ni-P coating for 2024 aluminum alloy was observed using scanning electron microscopy (SEM), and corrosion resistance of Ni-P coating in 3.5%NaCl solution was investigated by immersion, potendynamic polarization curves and electrochemical impedance spectroscopy(EIS). The experimental results show that KI reduces the amount of defect such pole in Ni-P coating, and the crystal grain becomes finer. The surface morphology of Ni-P coating gets more homogenous and smoother. Moreover, the phosphorus content of Ni-P coating is increased by KI. Both factors contribute to a better corrosion resistance for Ni-P coating in 3.5% NaCl solution.

2010, 30 (3): 44-47. DOI: 10.3696/j.issn.1672-6952.2010.03.012

Select

Optimization of Technological Conditions to Increase Yield of 8B Aviation Jet Lubricant

ZHANG Yu-guang

Abstract （303）

PDF （193KB）（226）

The technological conditions of lubricant synthesizing devices (five sets of coordinated equipment) of Fushun Chemical Plant was investigated in order to increase 8B aviation jet lubricant yield. The practical production and experiment indicate that the primary factors influence the yield and quality of 8B aviation jet lubricant are: composition of α-alkene, temperature of polymerization reaction, time of polymerization reaction, proportion of activator and operation of fractionating device.In the process of production and experiment, high quality paraffin is used to optimize the technological conditions of paraffin decomposition device in order to acquire higher quality α-alkene. Meanwhile, mass fraction of 8B aviation jet lubricant base oil can be boosted from 12%~15% increase to 17%~19% in normal decompressing fractionation through the optimization of technological conditions for subsequent polymerizing device and normal decompressor. It can greatly increase comprehensive economic profit of the device. This means that 4800 tons of paraffin material can be saved in producing every thousand tons of 8B aviation jet lubricant, and corresponding it has obvious economic benefits.

2009, 29 (4): 47-49.

Select

Mixing Phase Behavior of Aged Asphalts and Rejuvenators

LI Jin， XU Meng， ZHANG Xiao-ying， ZHANG Yu-zhen

Abstract （422）

PDF （179KB）（311）

The modified Flory-Huggins formula was adopted to calculate the free energy in mixing old asphalt with rejuvenator, and discussed their phase behavior. The solubility parameters and ratio of aromatic carbon of three aged asphalts are more than that of their materials. The mixing free energy of Caltex aged asphalt and rejuvenator R1 is above 0.0 (ΔGM＞0) at 25 ℃, their process of mixing is not spontaneity, so their mixing can’t form the homogeneous phase system. The mixing free energies of R2, R3, composite rejuvenator and aged asphalt are all below 0.0 (ΔGM＜0) at 25 ℃, their processes of mixing are spontaneity, so their mixing can form the homogeneous phase system.

2009, 29 (4): 17-23.

Select

Analysis and Application of Data Mining Algorithm Based on Decision Tree

ZHANG Yue,LIU Yang

Abstract （391）

PDF （179KB）（320）

The decision tree technique is a very effective method for classifying large datasets. By means of constructing a decision tree mode l, the technique picks up valuable classified rules , and helps the decision - makers to make out an exact forecast. The technique has widely applied in a great many fields. The technology is adopted to construct the decision tree model of the edibility of mushroom , which provides scientific basis for differentiating the edibility of mushroom by way of the mushroom property. The calculation of the decision tree uses the C4. 5 algorithm , which takes information gain ratioas attribute choice criterion. The experiment result shows that although the decision tree gives an unbalanced structure ,understandable decision rules are obtained from the decision tree.

2007, 27 (1): 78-80.

Select

Analysis of Mesh Dehiscence of 904L Used in MEK Uni t

ZHANG Yu -guang

Abstract （454）

PDF （169KB）（283）

The on -the -spot research and observation of corrosive shape w ere made for mesh dehiscence of water hat screen cloth in 904L under the working conditions of 6 MPa , 155 ℃, pH 37 using H type resin catalyst for producing me thyl-ethyl-ketone .The mesh crack w as found to be belonged to stress corrosion cracking through analyzing and observing alloy agent mass fraction, corrosive media test, inner material impurity , mesh residual stress resource , and crack shape of 904L.And also the expatiating was made for the main reason causing SCC ;lack of Ni, Mo and Cu content in the materials, excess of C and inner material impurities, much residual stress, and the damage to the inactivited surface during transportantion and installation.The process of SCC is that catalyst and mesh surface form the gap , and it is quickly acidificated.When pH falls to activating value of 904L , passivating film is destroyed in the gap because of reducing reaction .The macro corrosive battery is formed among metal inter surface , electrolyte solution and outer surface.When the corrosive depth develops to a certain value , it causes stress concentration resulting in cracking .The crack is vertical to the mesh circle and develops along with the mesh radius.When it reaches to the neutral surface of the mesh, the cracking disappears.There is no crack in the internal pressure area of neutral surface .Therefore , the crack can' t be found in the deeper corrosive pit of mesh surface .

2005, 25 (1): 64-66.