Automation in Petro-Chemical Industry

Research on Optimization Technology for Electric Desalination System Based on Big Data Analysis of Operating Parameters

2021, 57(5): 0-0.

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Based on 400 days-period of operating data of the electrical desalination system, the big data analysis method was used to establish a mapping relationship between the operating parameters and the after-desalination salt content. The model was then applied in intelligent prediction of the after-desalination salt content for a total of 1052 operating samples acquired form Apr. 2019 to Sept. 2020. An average error of 0.42mg/L was found by comparing the prediction salt content with actual value. In order to analysis the influence of operating parameters on salt removing efficiency, a model-based optimization method was proposed. The method was used to study several key factors that affect the salt removing efficiency for electric desalination process. Based on the screening results, several key operating parameters that role the salt removing efficiency for electric desalination system were analyzed and corresponding optimal operation suggestions provided. The after-desalination salt content can be significantly reduced by following suggestions provided with the optimization method.

Analyse control process of intelligent distributed at gas transportation station

2021, 57(5): 0-0.

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Abstract: In order to adapt the development needs of gas industry, now the domestic long-distance pipeline businesses are exploring the unattended station mode without any standards specification. Intelligent gas distribution of customer is the core problem to be solved if implement the unattended station.This paper is based on the sufficient study of internal and external unattended station mode, combined with the problems in the operation of the company’s unattended station test run. Research the automatic distributed gas, intelligent peak regulation, and implement logical control.The problem of frequent manual operation in the gas supply is solved. It is found that automatic distributed gas ,intelligent peak regulation system is stable and reliable. It provides experience and reference for the comprehensive carry out unattended station in the future.

Evaluation and Application of Safety Instrument Function SIL in Service

2021, 57(5): 0-0.

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Safety instrument system (SIS), DCS system or relay system solve the safety function of the device, and safety integrity level assessment (SIL assessment) is to evaluate the functional safety problem of safety function, that is, the ability of safety function can be performed reliably. SIL assessment is the hot topic of current domestic instrument technology application, especially in the early stage of the design is more and more attention and application, this paper takes the key dangerous chemical process gasification device for example complete SIL evaluation process, evaluation adopts the LOPA method to carry out the loop grading, from hardware constraints, two dimensions of average failure probability calculation circuit whether meet the requirements, the final SIL assessment in the application of instrument and control system for the daily management.

Discussion on the Extension of Lightning Protection by Armored Cable

2021, 57(5): 0-0.

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According to the requirements of current domestic and international standards and codes, combined with calculation examples, this paper studies the standard requirements of armored or shielded cables for lightning protection zoning extension, and provides some mathematical calculation formulas to deduce and calculate the minimum cross-sectional area of armored or shielded cables, which provides a basic basis for whether the electrical equipment using armored or shielded cables can consider not installing Surge Protection Device(SPD). It can be used for reference in engineering application.

Engineering design of isolation diaphragm for pressure or differential pressure transmitter to prevent hydrogen permeation in petrochemical industry

2021, 57(5): 0-0.

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Hydrogenation process is an important petrochemical process widely used in recent years. The hydrogenation process is under hydrogen condition with high temperature and high pressure. In this condition, the hydrogen can permeate pressure or differential pressure transmitter isolation diaphragm and enter the isolation liquid, which will affect the measurement accuracy and cause the transmitter failure. By plating gold on the surface of the isolation diaphragm of the transmitter, the gold plating layer can effectively prevent the permeation of hydrogen, thus ensuring the long-term use of the transmitter. However, gold plating of isolation diaphragm will increase investment. How to distinguish the working condition and gild the isolation diaphragm of the transmitter which needs gold plating is very necessary to ensure the normal use of the transmitter and save the investment. Unfortunately, there are no domestic standards to make detailed provisions on this subject. This also leads to some transmitters used in the hydrogenation unit in service, some of which are not gold plated, and the transmitter failure affects the long-term operation; some are generally plated with gold, which increases the investment and causes waste. The author has been engaged in the design of hydrogenation unit for a long time and has studied and practiced for a long time. Now the analysis and understanding of this problem is written in this paper for reference, also hope to get criticism and correction of peers and experts.

Research on Risk Assessment of Station Static Equipment Based on Improved Fault Tree

Chang-Jing LIANG

2021, 57(5): 0-0.

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Analysis of the Deliverables Management in Digital Delivery

2021, 57(5): 0-0.

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With the promotion of digital delivery in petrochemical industry, many enterprises focus on its standards and study how to manage the deliverables. In this paper, by participating in digital delivery of several large-scale projects of Sinopec, starting from introducing the types and contents of digital delivery, the author analyzes the common difficulties in the management of deliverables, and puts forward a series of solutions, such as comprehensive coding system, electronic document management system (EDMS), integrated design and phased delivery. Methods and suggestions provide innovative solutions for digital delivery projects and create more efficient information management services.

Improve the Stability of Data Transmission of Central Control DCS System in Typhoon Mode

2021, 57(5): 0-0.

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When the typhoon comes, all personnel of the offshore oil and gas platform will withdraw to the land, and the production of the platform will be remotely controlled at the land Zhuhai terminal, so that the platform can operate in unattended typhoon mode.In order to ensure the stability and safety of the platform in typhoon mode, we have done a lot of work to deal with the problems of unstable satellite communication, many invalid transmission points, poor DCS hardware status, and too much data buffered by DCs server, so as to ensure the running speed of DCS hardware and software, improve the quality of satellite communication and data transmission efficiency, and improve the stability of data transmission from central control DCS system to land terminal at the typhoon production mode.

Research on Cathodic Protection Current Measurement Device Based on Magnetic Collecting Ring

2021, 57(5): 0-0.

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For the buried long-distance pipeline with cathodic protection system, the current density of cathodic protection is not only an important index to measure the insulation performance of anti-corrosion coating, but also an important parameter to characterize the true cathodic protection state of the pipeline, so the current of cathodic protection in the pipeline should be monitored for a long time. A cathodic protection current measurement device based on the magnetic collecting ring is designed, the material of the magnetic collecting ring is silicon steel, and the influence of different opening shapes of the magnetic collecting ring on the magnetic field at the opening is explored. Through Maxwell software modeling and analysis, it is found that silicon steel has a very significant magnetic effect, and the magnetic induction intensity of the magnetic collecting ring is amplified by about 2000 times; the magnetic induction intensity at the opening of the magnetic collecting ring with different opening shapes is not the same, the rectangular opening has the best magnetic gathering effect, and the magnetic induction intensity at the opening is amplified by about 750 times. The experimental results show that the sensitivity and linearity of the designed cathodic protection current measuring device based on magnetic collecting ring are 1.855 and 3.24% respectively, which basically meet the measurement requirements.

Design and application of the oil-water interface detection instrument based on capacitance theory

2021, 57(5): 0-0.

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to solve the problem that transferring is not accurate for oil metering, because it is difficult to measure the oil-water interface accurately, this paper presents an oil-water interface detection instrument based on the theory of different capacitances between different mediums. The sensor made of MSP430，CD4051B，AD7143，is used to acquire the electromagnetic wave through the medium，and the parameter about electric is calculated，then oil layer and water layer could be recognized，the instrument could be operated by the RS485 for far away.The result shows that the oil-water interface instrument can meet the requirements by some tests.

Design and Applications of Gas Analyzer System in Sulfuric Acid Conversion Section

2021, 57(5): 0-0.

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In order to increase SO2 equilibrium conversion rate in conversion section of off-gas based acid making system, the concentrations of SO2 and O2 in off-gas to converter need to be monitored, to guarantee the SO2 initial concentration and reasonable O2 to SO2 ratio. Combined with the features of conversion section off-gas, by optimizing scavenging unit, sample unit and pretreatment unit and selecting the right analyzer, a set of SO2 &O2 analyzer system is designed to stably monitor the concentrations of SO2 and O2 in off-gas at outlet of SO2 blower , solving the common existing problems in the gas analysis at outlet of SO2 blower in sulfuric acid plant, such as easily block up, high maintenance volume, unstable system with large fluctuation, long lag time of analysis result and so on. In practical use, this gas analyzer system achieves the desired effect.

Lightning protection application of surge protector in PLC system of Waterworks

2021, 57(5): 0-0.

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With the rapid development of electronic technology, the integration of industrial products is getting higher and higher. Due to the secondary induction lightning stroke, the programmable control system of Yangzi waterworks No.1 water purification plant suffers from the loss of system platform data, resulting in the field equipment can not be controlled. Research on lightning waveform and area, and select lightning protection products and parameters in power loop and signal loop of control system .The optimized configuration of the system can realize the precise protection of the terminal equipment. The scheme shows that: reasonable analysis of lightning damage path, selection high-performance power supply type and signal type surge protectors can better achieve lightning protection; through the standardized lightning protection for grounding construction, it provides a good reference for solving the control system port damage caused by direct lightning or secondary induction lightning.

Integration system of automatic loading and metering for aviation coal auto factory

2021, 57(5): 0-0.

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Jet fuel zero factory integration of the automatic loading measurement system is proposed using Siemens S7-300 analog output (4 ~ 20 mA) quantitative loading control to realize automatic mass flowmeter, the RS - 485 communication realization of mass flowmeter live-fire amount as the final delivery quantity, and through the configuration software to realize the loading site monitoring, business process management, the load loading function such as data storage, remote online electronic transition, vehicles into the factory efficiency improved significantly.

Cause Analysis and Countermeasure of Power Module burn out in TRICON Control System

2021, 57(5): 0-0.

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tricon control system is mainly used in the integrated control of large-scale units, which requires high safety and stability for the normal operation of the system. The power module is the fundamental technical guarantee for the normal operation of the control system. The working principle and hardware circuit of tricon system power module are deeply studied, and the main causes of system power module burn out are investigated and analyzed in detail, and the measures and methods to solve the problem are put forward, It has some reference and guidance significance for the maintenance and management personnel of the system, and also has important guidance significance for the reliability of the power supply system and the correct selection of power supply control mode.

Retrofitting maleic anhydride desorption tower reflux tank level gauge

2021, 57(5): 0-0.

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The current liquid level gauge of maleic anhydride desorption tower reflux drum usually adopts external float level gauge, yet it has a series of problems, such as large maintenance workload, unstable measurement and unsatisfactory accompanying heat effect, etc. This article provides an in-depth study of the problems that exist in the measurement of float level gauge of the reflux drum of maleic anhydride desorption tower. We identified the key points for problem solving and drew up a preliminary retrofitting plan. We analyzed the operating principle of the sonar based external level indicator, and carried out the remodeling, docking and installing of the equipment. We have elaborated on the problems that have occurred and the results achieved after the reflux tank level gauge has been modified.

Discussion on Clock Synchronization Technique of Compressor Control System (CCS)

2021, 57(5): 0-0.

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Application of integrated process technology and control of coke oven flue gas heating + SCR denitration + semi-dry desulfurization

2021, 57(5): 0-0.

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This article focuses on the process flow, technical parameters and characteristics of the integrated process technology for coke oven flue gas heating and semi-dry desulfurization, and details the configuration of the control system and the control points of the denitration section and the desulfurization section。According to the characteristics of the flue gas, a reasonable process technology plan and advanced control system are configured, and a wealth of process data and engineering experience is provided for technology promotion through practical application engineering。

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