Automation in Petro-Chemical Industry

On Electromagnetic Compatibility of Control Room

2017, 53(1): 0-0.

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Electromagnetic compatibility (EMC) of electronic control system means the electronic system still has the normal working ability in the electromagnetic environment, and will not become a source of electromagnetic pollution in the environment. Generally use the "immunity" to measure anti-interference ability of the electronic control system in the electromagnetic environment; use the "emission" to show its electromagnetic pollution for the environment. A control system in industrial process is facing all kinds of electromagnetic interference (EMI), we cannot and should not the anti-interference function entirely by the control system of itself to undertake, it must to in the engineering implementation is taken various measures to ensure the normal operation of the control system in the industrial environment. This paper reviews several issues related to electromagnetic compatibility in the design of control room: 1) Technical specification for equipment selection ; 2) Voltage between neutral and ground for AC low voltage power supply system; 3) Electrostatic protection in control room; 4) Electromagnetic compatibility of lighting lamps; 5) Electromagnetic compatibility of the relay in the cabinet; 6) Electromagnetic compatibility of cable system in control room.

An Review on American Petroleum Tank Leakage Inspection Technique Status

2017, 53(1): 0-0.

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It was important to guarantee safe operation of large oil storage tank facilities. With high leakage risk, China commonly used extended service tanks. Applying advanced tank leakage inspection technique and adopt effective measures in early stage of tank leakage, can help to improve the safety and reliability of tank facilities. The paper introduced the advanced experience, recommended practice, advancement and disadvantage, and applicable scope of tank leakage inspection technique in American, including conventional personal metering method and nondestructive testing method, and the American Petroleum Institute recommended tank bottom leakage prevention system PRB, as well as in recent years, the new development of the storage tank based on the drilling method, acoustic emission detection method and resistance leakage method, etc. Finally, the suggestion of selecting suitable tank leakage inspection technique and adoption of American standards to improve domestic tank leakage technique were maded.

The practical application of instrument maintenance and operational bypass for safety instrument system in refinery process unit

2017, 53(1): 0-0.

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With the large-scale development of China's oil refining device, The safety Instrument System is widely used. The SIF and its safety integrity are limited in the bypass condition of safety instrument system , so the design and operation management of Bypass become the focus of safety instrument system. From the Angle of engineering design, The author does valuably explore on the instrument maintenance and operational override switch for refining device .

STR & SIF Loop Design

2017, 53(1): 0-0.

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This paper introduces the caculation method of spurious trip rate(STR) by ISA-TR84.00.02，and the judging method of the STR。According to the specific case，caculate the SIF loop STR combined with common instruments and safety integrity level identification instruments respectively，compared with the STR of different MooN SIF structures。Analyze the influence of junciton box、surge protective device、safety barrier、relay to the SIF loop，then give the advices of SIF loop design combination with the engineering practice。

Analysis of Supercritical Once-through Boiler Water-coal Ratio

2017, 53(1): 0-0.

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The Supercritical Once-through Boiler is a complex system with the characteristics of strong-coupling non-linear multiple parameters. Quick and accurate measure of its water coal ratio is the guarantee of the boiler’s safety, economy and stable operation. This paper derivation formula of the heat rate of the Supercritical Once-through Boiler based on energy consumption, then correct the heat rate and power by the correction curve. And finaly get the formula of water-coal ratio. This paper taking a 600MW Supercritical Once-through Boiler as an example for research , calculate the coal water ratio of various working condition,and compare with the field data to check up the accuracy of the proposed method.

Selection and Analysis of level meters in HT-L coal gasification

2017, 53(1): 0-0.

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Abstract： Level measuring is an important part of the automatic control system of coal gasification, this paper briefly summarizes the types of current level meters, and makes a comprehensive comparison of several level meters common applied in HT-L coal gasification projects. Then the principle and procedure of level meters selection has been proposed, and based on the actual process conditions of HT-L coal gasification, the appropriate level measurements has been selected, some of which has been analyzed and improved according to the actual effect of application.

Discussion of Key Control Schemes for Oxygen –Enrichment Sulfur Recovery Unit

2017, 53(1): 0-0.

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Key control schemes of Oxygen –Enrichment Sulfur Recovery Unit are discussed with practical engineering background. Combustion control scheme with adjustable oxygen-enrichment set-points are put forward; Inlet/outlet temperature control and interlock schemes are put forward for hydrogenation reactor; combustion air flow control are optimized according to incinerator operating requirements.

Research on performance curve of centrifugal compressor

2017, 53(1): 0-0.

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Actual speed of centrifugal compressor is often different from the designed speed, so the performance curve in the operations manual can’t reflect the compressor running. In this paper, taking BCL355/A type centrifugal compressor as the research object, the BP neural network was used to predict performance of compressor. Test samples verify the effectiveness of the method and the performance curve of centrifugal compressor was drew under the actual speed.

Application of SIL analysis in PH-SDPP engineering projects

2017, 53(1): 0-0.

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In order to determine the safety and reliability of the safety instrument system（SIS）, Making SIL analysis for offshore oil engineering projects has become a trend. In this paper, taking SIL analysis of PH- SDPP engineering project as an example, modified risk chart analysis method, one of most commonly used SIL analysis methods in offshore oil field , whose main principles, processes, steps were briefly introduced .SIL was finally determined by the means of this method.

Wellhead control panel optimization research and application of The east China sea high pressure gas oilfield

2017, 53(1): 0-0.

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The east China sea high pressure gas oilfield as the research target , according to reservoir high pressure characteristics and parameters of christmas tree, research oilfield development wellhead control panel faces such rapid increase formation pressure, high pressure and corrosion problems ,facing the combined platform and logic control operation function needs, focusing on a control panel wellhead pressure gradient system design, test and data acquisition system, the structure of the high-pressure process in the form of an interface component selection, selection of stainless steel, the core component selection and equipment, such as a technical optimization . To develop the technical solutions adapted to meet the specific requirements under the reservoir oilfield exploration and development of high-pressure conditions.

Application of Least Squares Support Vector Machine in Heavy Marine Oil Blending

2017, 53(1): 0-0.

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To solve the low accuracy problem of nonlinear predictor in heavy fuel oil blending, least squares support vector machine (LSSVM) is applied. This article describes the basic algorithms of LSSVM and builds predictive models, such as viscosity and density index, compared with the general computing model, calculates the index data. From the results, the prediction model based on LSSVM is more multifunctional, high prediction accuracy and strong adaptability, it has a significant future prospects.

Design of Advanced Alarm Management System for Petrochemical Plant

2017, 53(1): 0-0.

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Base on the design philosophy of IEC61511 independent protection layer (IPL) definition, the reasonable alarm setting is very important for petrochemical plant. In accordance with IEC62682 alarm system definition, the key performance Indicator (KPI) and the levels of alarm system are presented. Complying with ANSI-ISA 18.2 alarm management life cycle definition, alarm management work flow structure and content are introduced. The design principle and the network architecture of advanced alarm management system (AAS) are described in detail. The technical trend of development for AAS in petrochemical plant in the future is expected.

Cathodic protection of oil water well casing and its application in online remote monitoring system

2017, 53(1): 0-0.

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In Changqing Oilfield existing oil well casing cathodic protection device, large volume, bulky, adjustable voltage sparks insecurity, low efficiency and no online remote monitoring function, design a kind of oil well casing anti corrosion cathodic protection remote on-line monitoring system, mainly by on-line monitoring device and a remote monitoring device is composed of two parts; completion of casing in oil wells and water wells forced current cathode protection, combined with the remote monitoring center to carry on the real-time monitoring to the process of cathodic protection. The system has the advantages of high efficiency, energy saving, small size, light weight, low cost, convenient networking, stable and reliable data transmission, friendly man-machine interface and powerful functions. From 2014 to 2015 in Changqing oilfield application more than 30 well group, to reduce the risk of oil well casing corrosion, implementation and accords to the demand of oil field development.

AAA

2017, 53(1): 0-0.

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自力式阀在危险化学品领域应用的功能安全性与对策

2017, 53(1): 0-0.

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摘要：本文根据2013年发布的国家标准，GB30439.4-2013《控制阀的安全要求》，试图探讨自力式阀单膜片执行机构存在的“防流体危险”的潜在隐患和解决方案。以企达到提高自力式阀的安全要求和控制方案的安全性！

The Design and Harmless Improvement of the Pretreatment System of Magneto-dynamic Oxygen Analyzer

2017, 53(1): 0-0.

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Abstract：This paper revolved around the application of the Magneto-dynamic Oxygen Analyzer in a typical amino oxidation reaction equipment. The operating principle of the Magneto-dynamic Oxygen Analyzer and the physical and chemical property of measured medium are analyzed. The Pretreatment System of the Magneto-dynamic Oxygen Analyzer is designed on the basis of relevant specification. An improved design is proposed aiming at some user feedback :measured deviation and fluctuation,false alarm,and the environmental pollution. The designed index can be completely achieved.

Valve Inspection and Testing Standard Analysis

2017, 53(1): 0-0.

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On-off valves and control valves are common fluid control equipment in oil and gas field surface project. Valve inspection and testing shall be executed strictly as per standard and specification. There are many standards and specifications regarding to valve inspection and testing in China and abroad. It is prone to controversy in the process of valve inspection and testing due to the different standards and specifications. Then the FAT (Factory Acceptance Testing) is unable to proceed successfully. It is a great trouble for valve manufacturer, engineering company and client. The paper summarizes the differences among common international valve inspection and testing standards. It can be as a reference for relevant technical engineer in engineering application.

The application of Paramagnetic oxygen analyzer in the oximation reaction

2017, 53(1): 0-0.

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Caprolactam is one of important organic chemical raw materials; the cyclohexanone oximation reaction is a very important part in the production of caprolactam. The raw materials of caprolactam production include the hydrogen peroxide. Decomposition reaction of hydrogen peroxide will happen in the oximation reaction, and it will release the oxygen. There are other combustible gases in the tail gas, so it needs to detect the oxygen content in the tail gas. This paper focuses on the application of Paramagnetic oxygen analyzer in the oximation reactionthe, structure and measuring principle of paramagnetic oxygen analyzer, sampling and pretreatment, and the problems which should be paid attention to.

Instrument and monitoring system for LNG storage tank

2017, 53(1): 0-0.

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According to the requirement of LNG measurement system, select the appropriate instrument to measure the liquid level, temperature and density. The characteristics of servo liquid level gauge, radar liquid level gauge, multi point thermometer, LTD, and tank side display are expounded. Combining with E+H Tankvision inventory management system, the structure of the storage tank measurement system was established. Tankvision system can display the tank level, temperature, density and other parameters, and can monitor the LNG level, to achieve inventory management．

Intelligent development and maintenance system of Yulin gas compressor station circulating water pump

2017, 53(1): 0-0.

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In order to achieve Yulin compressor station circulating water pump intelligent maintenance. The intelligent maintenance system of circulating water pump based on the industrial Ethernet structure is designed. The system consists of a remote monitoring terminal (PLC system), a TCP/IP photoelectric converter, a client switch and a host computer. PLC system, the hierarchical system of photoelectric conversion device and the host computer system layout, timing by PLC pump running time of 6 cycle operation, and automatic configuration of pump stage operation, ensure the normal maintenance of the host computer through the optical fiber; the pump total running time is transmitted to the central control room, realize centralized monitoring of running time the number of parameters such as pump, maintenance. The implementation results show that this scheme has high intelligence, strong anti-jamming capability and cost advantages, the traditional compressor station has a strong reference circulating water pump intelligent maintenance.

The application of metering system in fiscal transfer of natural gas

2017, 53(1): 0-0.

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Along with the efforts to increase for environmental protection in china，the consumption of natural gas as a clean energy source is growing；the fiscal transfer of natural gas is more and more。Gas metering system is an important part of this fiscal transfer and the correctness of the gas metering system shall be directly related to the fundamental interests of buyers and sellers。This paper focuses on the design、configuration of gas metering system for fiscal transfer of natural gas and the laboratory calibration for ultrasonic flowmeter；and detailed introduces the key point - the calculation formula of the uncertainty (accuracy) value for gas metering system。It can help the readers more rational and more effective to establish the gas metering system for natural gas fiscal transfer；Of course, it can be a reference for other (such as oil, etc.) custody transfer metering system。

Calibration of Nuclear Level Gauge in the Innovene PP Reactor

2017, 53(1): 0-0.

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The Innovene PP process utilizes a horizontal stirred-bed reactor design, the reactor must remain permissible level of powder before start-up and normal operation. The powder bed level was one of the key parameters of this process, which was detected by a nuclear transmission gauge, and controled by discharge system. The propylene polymerization was carried out under the pressure of 2.2MPa, so the density of the gas phase medium will bring great influence on the bed material level measurement. To measured the reactor true powder bed level, the relationship between the powder level and radiation intensity was established in this paper, and been corrected based on the data of gas phase density. The formula corrected could be used in reactor operating conditions, when the date of reactor pressure, temperature and count rate of level meter receiver were abtained, the true powder bed level of reactor could be calculated.

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