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2015, 51 (5): 0-0.   Abstract （250）            Knowledge map    Save This article mainly introduced the application of PLC in Vapor recovery monitoring systems for gasoline filling station. Through to the system’s hardware design method and the programming mentality's introduction, the article from the design application's angle introduced a gasoline vapor on-line monitoring system composed by OPLC, the superior machine, the sensor and so on. The system uses the OPLC data acquisition operation technology and the data bus mechanics of communication, in addition the superior machine industry configuration software man-machine conversation contact surface, the real-time monitor, the real-time long-distance issue, enable the entire gasoline vapor on-line monitoring system to achieve the online continuous monitoring and recycling gasoline vapor’s Air to liquid volume ratio, pipeline's stopping property and the fluid anti- situation request. Related Articles | Metrics

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Automation and Instrument System Engineering Design and Construction Strategy for Modern Refinery in China    2014, 50 (6): 0-0.   Abstract （205）            Knowledge map    Save Abstract：Automation and instrument intergraded system engineering experience and practice for modern refineries in China is summarized. It is pointed out that the factory internal network, control network and production data could not be open to outside and internal information shall not be issue to public for factory secrets and safety. Technical obstruction and differences will be analyzed for discussing the viewpoint and design strategy that integrate Chinese technology to complete, understand, take use of, develop since take advantage of technology from overseas. The over design and insufficient design in present engineering construction process is discussed. Practical thinking for engineering design and construction is introduced. Related Articles | Metrics

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2015, 51 (6): 0-0.   Abstract （201）            Knowledge map    Save Related Articles | Metrics

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The application of coke tower "three valves interlock" in Coking plant    2015, 51 (2): 0-0.   Abstract （159）            Knowledge map    Save This paper mainly introduces the application of Interlocking between the four way valve and the feed block valve of Coke tower，the design ideas，the hardware composition,and the realization method. Related Articles | Metrics

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Design and Numerical Simulation of Control valves with Micro Flowrates for High Pressure Difference applications    2015, 51 (2): 0-0.   Abstract （185）            Knowledge map    Save Control valves with micro flowrates (CV <0.1), for high pressure difference (△P> 10Mpa) working applications, inevitably cause flashing or cavatition,which issues in problems such as mechanical vibration, stem breakage, erosion of the sealing surface, noises and so on.To decrease them, a orifice plate was introduced with multi-stages as throttling elements,aiming at the achievement of proportional pressure difference between stages, which could reduce flashing, cavatition and erosion in sealing area. Firstly, the key dimensions was determined by use of formulas ,and then CFD software was used to calculate the fluid conditions inside the valve. The result of numerical simulation and flow test, eventually shows that the theoretical calculation and numerical simulation are reliable. Related Articles | Metrics

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Discussion and solution of PTA oxidation reactor level measurement error    2014, 50 (6): 0-0.   Abstract （256）            Knowledge map    Save Abstract： Liquid level is one of the main technological parameters of chemical production, the traditional differential pressure level technology has been widely used in the production, but It is difficult to applied in the high type containers and tower. Through the background introduction, liquid level measurement system composition and heat tracing conditions introduction, the article introduces a series of level measurement error caused by the liquid level increase and the growth of the sealing liquid pipeline after PTA oxidation reactor upgrading. The causes of problems is illustrated by computation. And then, paper introduces the measuring principle, components and advantages of Rosemount 3051 s/ERS liquid level transmitter retrofit scheme. Finally illustrate the feasibility of the scheme through the application example. Related Articles | Metrics

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The Soft Measurement for Carbon Deposition of Platform Catalyst based on RBF in DCS    2015, 51 (3): 0-0.   Abstract （160）            Knowledge map    Save A importance index to platform catalyst is the carbon deposition, it is significant to measure the carbon amount of platform catalyst. This paper discussed the soft measurement technology for carbon deposition of platform catalyst based on RBF neutral network through DCS. On the basic of simple introducing platform progress, it outlined soft measuring of platform catalyst, and then described the RBF neutral network theory and establishing of neutral model further. It also narrated programming in the DCS for the achievement of the soft measurement technology about carbon deposition of platform catalyst. Related Articles | Metrics

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Analysis and Improvement of the Control Valve Swings    2015, 51 (1): 0-0.   Abstract （193）            Knowledge map    Save Annual output of 600ktons of methanol plant, high pressure steam to the medium pressure steam and decompression valve opening midway through the trip will happen swings, steam pipe network instability and thus influence the turbine operation. After continuously trying to grope and in-depth analysis, find the root cause of the problem and the corresponding design modification, finally solved the problem, has realized the full valve stroke, full-time space and stable operation.This paper describes in detail the whole process of analysis and solve the problem. Related Articles | Metrics

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A control scheme design for the PTA slurry preparation of PET plant    2015, 51 (2): 0-0.   Abstract （188）            Knowledge map    Save Abstract: According to the problem about low control accuracy of PTA slurry preparation in traditional PET, a cascade ratio control strategy which the variables are PTA slurry density and EG mixture for the PTA slurry preparation was designed based on the mathematical model of esterification reaction and analyses of control variable. Temperature correction which can improve control precision was introduced in molar formula. Related Articles | Metrics

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abc    2015, 51 (2): 0-0.   Abstract （205）            Knowledge map    Save abc Related Articles | Metrics

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Discussion Application of High Integrity Pressure Protection System (HIPPS)    2015, 51 (6): 0-0.   Abstract （306）            Knowledge map    Save Along with the development requirement of chemical and refinery industry as well as the safety improvement requested by Government, the passive pressure relief system cannot be satisfied the safety requirement. Compared with western country, active safety such as high integrity pressure protection system (HIPPS) had been used in part of the chemical and refinery projects. What is difference on using HIPPS? It depends on standards and codes, no relative in domestic whereas recommended in western country. This paper described the concept, selection principle, implement, and detail specification of HIPPS, which will be the reference on adopting the HIPPS. Related Articles | Metrics

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The scenario study of start-up and shutdown of oil and gas processing by dynamic simulation technology    2015, 51 (2): 0-0.   Abstract （146）            Knowledge map    Save In the petroleum natural gas exploitation process, the research of initial start-up and shutdown of oil and gas treatment process system is one very important part in the system design, especially to the new technology and process. The research result of production start-up and shutdown directly influence the production safety and the period of the process system start-up and shutdown. The steady simulation has been gotten an extensive application in the process designing of the oil and gas production process system, but for non-steady state process, such as process system initial start-up and shutdown, the research has to ask for the help of dynamic state process simulation software. Using the Hysys dynamic state function, the page has studied the initial start-up and shutdown process in the oil and gas treatment process system, the result can give an effective guidance to the actual process production. Related Articles | Metrics

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Design of Online Web Monitoring Platform for Vapor Recovery Unit in Bulk Gasoline Terminals    2015, 51 (1): 0-0.   Abstract （178）            Knowledge map    Save Recently air pollution is increasingly serious in our country. In 2007, GB20950 ( Emission standard of air polluntant for bulk gasoline terminals ) was proposed by SEPA (State Environmental Protection Administration) to reduce the gasoline vapor emissions in the bulk gasoline terminals. According to this standard, vapor recovery unit should be installed in every bulk gasoline terminal before the deadline. In order to monitor these units remotely in an intergrated platform, an online web monitor platform was designed based on OPC technology, C/S structure, B/S structure, etc. Actual test shows that this platform is characterized by Good compatibility, strong real timeliness and good reliability Related Articles | Metrics

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Sulfur Acid Gas Combustion Furnace Thermocouple Failure Analysis and Improvement Measures    2014, 50 (3): 0-0.   Abstract （191）      PDF       Knowledge map    Save Analysis of the difficulties of sulfur acid gas combustion furnace temperature measurement, and from the aspects of high temperature, thermal shock resistance, high temperature corrosion of thermocouple failure reasons, puts forward improvement measures. Related Articles | Metrics

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abc    2014, 50 (3): 0-0.   Abstract （238）      PDF       Knowledge map    Save abcdef Related Articles | Metrics

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abcde    2014, 50 (6): 0-0.   Abstract （252）            Knowledge map    Save agcddddddddd Related Articles | Metrics

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The APC and RTO Development Technology of Ethylene Cracker Based on NIR Jing-Cheng Yang    2014, 50 (4): 0-0.   Abstract （478）            Knowledge map    Save This paper mainly introduces advanced process control and real-time optimization technology development, research and application of characteristic of cracker in ethylene based on online NIR analysis of ethylene .NIR Analyzer configuration requirements and functions is described in detail. APC and RTO implementation of typical control schemes in cracking furnace are described in detail. The operation interface of the program is explained. It is described the requirements of oil POINA model. Finally,It is introduced each external conditions which the APC control is need. Related Articles | Metrics

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PI controller and decoupler based on feedforward strategy for ball mill    2014, 50 (4): 0-0.   Abstract （197）            Knowledge map    Save Abstract:The ball mill object has got some problems such as multi-input-multi-output, strong coupling, large time delay.This paper presents a new multivariable decoupling PI control strategy. First, a decoupler is proposed to achieve complete decoupling. Second, a model reduction method is obtained with a target for the first-order plus dead time model(FOPDT). Based on the simplified model, a feedforward compensator is applied to the process and this article offers a easy parameter tuning PI controller. In order to demonstrate the performance of the proposed method it is applied to a ball mill model, the results show that the new strategy is superior to the general method in the following aspects:set-point following performance, model reduction, complete decoupling. Related Articles | Metrics

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Designing fractional-order model reference adaptive Rate using Lyapunov theoretical    2015, 51 (5): 0-0.   Abstract （159）            Knowledge map    Save Introducing the basic structure and control theory of model reference adaptive control. Using the system's input-output method to design fractional controller, and for linear systems with unknown parameters, by constructing a new Lyapunov function that containing Fractional Calculus options. Designed a new adaptive rate, and prove the design of an adaptive rate is useful. Related Articles | Metrics

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2014, 50 (5): 0-0.   Abstract （195）            Knowledge map    Save Related Articles | Metrics

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Research on ensembling method for Modular Neural Network wenbo liu    2014, 50 (4): 0-0.   Abstract （217）            Knowledge map    Save In order to solve the problem of modular neural network (MNN) ensemble. This paper integrated the ideas of “divide and conquer” and “put the heads together”, and proposed a measure of selecting sub-nets on-line. For a given input, this method calculated the distance of the input and the center of sub-nets firstly, and then constructed the fuzzy member degree based on distance measurement, finally realized on-line sub-nets selection by fuzzy judgement. The number of sub-nets varied to different inputs. This made the MNN’s self-adapting ability be stronger. It ensembled multi sub-nets by linear method. The weights of sub-nets were optimized by reconstructing the sample space and dynamic programming. The simulation results suggest that this method can improve the precision and generalization ability effectively. Related Articles | Metrics

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2015, 51 (4): 0-0.   Abstract （233）            Knowledge map    Save Related Articles | Metrics

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Design and Application of Safety Instrument Systems in Chloroacetic Acid Project    2015, 51 (3): 0-0.   Abstract （210）            Knowledge map    Save It is very important that the Safety Instrument Systems（SIS）in preventing and reducing oil chemical factory or device process risk. It is directly affects the safe operation of the equipment that the SIS system designed reasonable or not. According to the detail identification of hazardous chemicals major hazard installations and the complete device node hazard and probability analysis which the main production process of an annual output of chloroacetic acid 50000t project, the paper have confirmed the Safety Integrity Level(SIL) of the liquid chlorine storage and vaporization device, analyzed and carried out the major control parameters. It have been designed the SIS system of the device and the complete interlock and control, and put into production operation. The SIS system have been running well in the actual production and ensuring safe production of the production device which represents the SIS system’s reliability, security and the characteristics in the production of the chloroacetic acid project. Related Articles | Metrics

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The equipment of outside positioning and assisting    2015, 51 (4): 0-0.   Abstract （201）            Knowledge map    Save The small dynamic pressure measurement is a hard technical problem in oil drilling, the paper proposed a design of PSI pulsed gas generator, which can provide reliable support in terms of design, debug, calibration, scaling for the precise instruments. Pulsed gas whose pressure and frequency are adjustable is produced by the gas generator whose accuracy can be 0.1PSI. In addition, the gas generator can also support RS232/RS485 output convenient for filed debug and remote communications.The design has been used in oil drilling and it produces good results, which has good practical prospect. Related Articles | Metrics

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Based on CFD buried town medium pressure gas pipeline leakage    2015, 51 (5): 0-0.   Abstract （154）            Knowledge map    Save Related Articles | Metrics

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Exploration of PROFIBUS-PA application in engineering practice    2015, 51 (6): 0-0.   Abstract （204）            Knowledge map    Save Application in automation area has been making progress with each passing day along with the rapid development of network communication & information technology. A new era of fieldbus instrument has been turned on in tobacco industry and building material industry. In chemical and petrochemical area, although conventional transmitter with 4-20mA plus HART protocol prevails widely, but the advanced fieldbus configuration and concept, such as PROFIBUS-PA, Foundation Fieldbus, has been introduced in domestic plants by international chemical company, BASF, Celanese. The writer is fortunate to adopt PROFIBUS-PA currently, and find out and summarize some experience in PROFIBUS-PA application, which is shared below. Related Articles | Metrics

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The Flow Compensation of the Real Gases    2014, 50 (2): 0-0.   Abstract （209）            Knowledge map    Save The compensation of the temperature and pressure is used for calculating density of the ideal gases in the engineering application. It must be take into account the actual gas compression factor. The Lee-Kesler equation to calculate the actual gas compressibility factor is used in the paper, and the calculation method can be realized in the PLC. That is the reason why this method can solved the density compensation of the real gases . Related Articles | Metrics

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Design of Monitoring System for Oilfield Sewage Treatment    2015, 51 (1): 0-0.   Abstract （141）            Knowledge map    Save As the old oil fields in the increase of water content in the development process，the current oilfield sewage treatment has become an urgent problem．According to the characteristics of oilfield sewage treatment process and design a set of oilfield sewage treatment monitoring system based on industrial control software，the sewage treatment process important parameters were monitored，and some important dosing part in the research of control method，improve the quality of sewage treatment and achieved satisfactory results． Related Articles | Metrics

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Measurement of Eectromagnetic Flowmeter and its Application in Engineering Design Project    2014, 50 (6): 0-0.   Abstract （176）            Knowledge map    Save Describes the electromagnetic flow meter for measuring principle, characteristics, application, and the application of the note. It also describes the specific case, and the engineering design choice in electromagnetic flow meter to take into account the factors and Electromagnetic flow meter installation requirements are described in detail. Related Articles | Metrics

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Application of SIL Quantitative Calculation and Evaluation Method in Basic Process Control System    2014, 50 (6): 0-0.   Abstract （207）            Knowledge map    Save According to the basic method of probability, this paper led quantitative calculation and evaluation method of Safety Instrument System (SIS) and concept of average probability of failure on demand(PFDavg) into evaluation of basic process control system(BPCS), which has many kinds of control structures. According to these different characteristics of structure, this paper listed six integrated formulas of common control structures. With the expectation that induction of these methods and concepts can offer help to measure the executive capability of BPCS, and offer scientific and trustworthy foundation for design, installation, maintenance, modify and decommission of BPCS. Related Articles | Metrics

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The length-calculation and Selection of Instrument Cable    2014, 50 (5): 0-0.   Abstract （302）            Knowledge map    Save The load capacity of the instrument signal circuit is analyzed, and then the maximal cable length is calculated according to the load limitation of several typical two-wire instrument in this paper. By the contrast, the maximal laying length is calculated according to the design code, and the largest laying length with different power instruments is draw. For intrinsically safe circuit, cable maximal laying length is calculated according to the two formulas of intrinsically safe circuit, finally, the selection step of instrument signal cable is summarized. Related Articles | Metrics

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The Application and Calibration Test of Vapor Recovery On-line Monitoring System in Filling Station    2015, 51 (4): 0-0.   Abstract （228）            Knowledge map    Save Abstract：In order to monitor the parameters of the vapor recovery system,some filling station in Beijing started to equipt with on-line monitoring system.To make sure that on-line monitoring system is correct and stable,calibration test was practiced according to DB11.On the basis of the installation and calibration test results,the existing problems about on-line monitoring system are analyzed,and reasonable suggestions are proposed. Related Articles | Metrics

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Type and Application of Desuperheater    2015, 51 (6): 0-0.   Abstract （279）            Knowledge map    Save The function of desuperheater is to convert superheated steam into saturated steam or low temperature superheated steam. The working principle is to reduce the temperature of superheated steam by heat exchange between the warm water and the superheated steam, and eventually reach the heat balance. To select the suitable desuperheater through the caculation of desuperheater. Introduced the types of desuperheater, anaylized the factors of affecting the temperature reduction, and presented the problems about the selection and the installation of desuperheater, then to help you better understand and use it. Related Articles | Metrics

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Operation Data System and Intellectual Management in Ethylene Plant    2014, 50 (5): 0-0.   Abstract （220）            Knowledge map    Save In many ethylene plants, ubiquitous information awareness and acquisition terminals collect huge production data. In order to meet more and more requirements of intellectualness and digitization for enterprise information management, let the enterprise production management departments make decision based on more information data, operation data system (abbreviated ODS) become the foundation for total ethylene plant to realize the digitization, informationization, intellectual management. This paper describes the principle, function structure, network structure, and shows ODS application in intellectual management of ethylene plant. Related Articles | Metrics

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2014, 50 (2): 0-0.   Abstract （280）            Knowledge map    Save Related Articles | Metrics

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The Research on Cable Penetration Design of Control Room and Field Auxiliary Room    2014, 50 (3): 0-0.   Abstract （322）      PDF       Knowledge map    Save No matter which way to cable entry of control room and field auxiliary room, the selection and design of cable entrance seal mode needs to be taken seriously by designer.It relates to safety, construction, maintenance, investment, etc. Analyzed common mode about cable seal & inlet wire of the control room and field auxiliary room , combined with engineering practices, it expounds the several problems and suggestions that should be paid attention to in the design of sealing method. Related Articles | Metrics

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GE coal slurry gasification Lockhopper sequence and lockhopper valve selection    2015, 51 (5): 0-0.   Abstract （219）            Knowledge map    Save Lockhopper system plays a crucial role for the stable running of coal gasification plant. According to the requirements of the process，the Lockhopper cycle design is briefly described. The selection of lockhopper valve with harsh conditions is discussed primarily. Based on the actual project，the reference for instrument selection of similar process plant is provided Related Articles | Metrics

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2015, 51 (6): 0-0.   Abstract （194）            Knowledge map    Save Related Articles | Metrics

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Application of CEMS in Acrylonitrile Plant’s Wastewater Incinerator    2015, 51 (1): 0-0.   Abstract （189）            Knowledge map    Save As the Continuous Emission Monitoring System gets more widely used in the chemical industry, combined with examples of a Continuous Emission Monitoring System in Acrylonitrile plant's wastewater incinerator, introduce the formations and configurations of the system from the engineering design's perspective. Related Articles | Metrics

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Discussion on Design of Analysis System in the Coal Gasifier    2014, 50 (5): 0-0.   Abstract （240）            Knowledge map    Save This paper introduces the design of online analysis system of coal gasification plant selection points, according to different process detection requirements to choose the appropriate analysis instrument. In order to make the readers to better understand the analysis system, the sampling probe, sample pretreatment and the structure, principle and application of on-line gas chromatograph has also done a brief introduction. Related Articles | Metrics