Automation in Petro-Chemical Industry

Design and application of gas pipeline overpressure protection system

2023, 59(2): 0-0.

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Process failure risk assessment of oil and gas station based on BN-LOPA model

2023, 59(2): 0-0.

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Emergency Treatment of the Failure of the Cylinder Piston Sealing Ring of the Program Control Valve

2023, 59(2): 0-0.

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Brief study on Troubleshooting and Countermeasure of transmitter signal jump of tank Radar Level Meter

2023, 59(2): 0-0.

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Optical fiber micro-cantilever sensor for natural gas pipeline leak monitoring

2023, 59(2): 0-0.

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A vibration sensor of fiber optic microcantilever beam is proposed to detect the leakage of pressure pipe by detecting the vibration signal caused by the leakage. Fiber micro cantilevers are prepared by picosecond ultrashort laser and focusing ion beam. The experimental results of 2mm leakage aperture and 1.5 MPa, 2.5 MPa and 3.5 MPa leakage pressure show that the sensor can detect vibration signal near buried gas pipeline with a minimum value of 0.05g. The vibration signal caused by leakage can be effectively detected within 30cm of the gas pipeline and can be used for gas pipeline leak monitoring and early warning.

Application and improvement of laser gas analyzer in exhaust gas detection of chemical production

2023, 59(2): 0-0.

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Abstract: The near-infrared laser absorption spectroscopy technology based on tunable semiconductors uses the absorption lines of ammonia gas in the near-infrared band to generate high-frequency sine wave and triangular wave signals through the STM32 chip,stable driving of DFB laser by constant current circuit to realize fast gas detection. This technique has the advantages of high accuracy, free from cross-interference of background gas and easy to use. The exhaust gas in the catalyst manufacturing process has the characteristics of high temperature, high water vapor content, and high dust concentration， The scattering of water vapor and the reflection of dust lead to the poor detection effect of the laser gas analyzer on the external exhaust tail and the measurement accuracy low， the laser transmittance shows only 0-10%. In the later stage of equipment debugging, the introduction of auxiliary tooling for the in-situ laser gas analyzer increased the laser transmittance to 60%-80%, successfully eliminating the impact of the above-mentioned harsh working conditions on the measurement accuracy.

Application of PLC transformation in control system of key unit

2023, 59(2): 0-0.

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The circulating gas compressor K201/251 of a petrochemical company's 2# polypropylene unit is a complete set of equipment made by KOBELCO, Japan. The control system of the unit is realized by Siemens PLC S7-300. The PLC of S7-300 series is a non-redundant control system. The failure of a single hardware or communication network will directly lead to the abnormal operation of the control system. Since the start of construction in 2013, frequent PLC system failures have resulted in compressor interlock shutdown, leading to several unplanned shutdown of the device. At the same time, the PLC system has no SOE event recording function, and the system clock is not synchronized, so it is impossible to find out the reason for shutdown in the first time. During the plant shutdown in 2022, the original PLC system was transformed into Honeywell DCS system, and the modified control system hardware and network structure realized redundant configuration, while supporting online card replacement, online installation procedures, etc. Greatly improve the reliability of unit control system, equipment maintenance and process operation.

Control and application of refrigeration unit in low temperature diesel oil absorption unit

2023, 59(2): 0-0.

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Abstract: The important equipment in the low temperature diesel oil absorption device is the refrigeration unit. The working efficiency of the refrigeration unit directly determines the absorption effect of the whole device. The control scheme and interlock protection of the refrigeration unit are mainly introduced to ensure that the refrigeration unit works in the best state, reduce the cooling loss and reduce energy consumption. Interlock protection occurs when the device is deviated from working conditions; At the same time to ensure the efficiency and stability of the device.

Analysis of SCADA system and DCS system integrated monitoring technology

2023, 59(2): 0-0.

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Through the continuous pursuit of high-quality development, innovation of management concept and progress of management level in four sub industries of oil and gas field, LNG terminal, urban gas and gas storage, this paper focuses on the analysis of enterprises from the perspective of industry automation level, and considers the key points and technical routes for automation improvement, which plays a guiding role in the improvement of automation level in multiple industries. ① From the development needs of oil and gas fields, LNG terminals, urban gas and gas storage, the necessity and key of centralized control, remote operation and integrated monitoring are analyzed; ② By analyzing the characteristics of SCADA system and DCS system commonly used in many industries, the main problems faced in realizing integrated monitoring are pointed out; ③ Determine the technical line for integrated monitoring of SCADA system to DCS system. Finally, it is pointed out that the operation managers of the oil and gas industry play a leading role in tackling this technical problem, are the core of integrating automation industry resources and uniting the automation industry, and are the key points to achieve technological breakthroughs.

Application of soft instrument technology in refinery and chemical plant

2023, 59(2): 0-0.

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This paper introduces the principle and method of soft instrument technology and its practical application in refining and chemical enterprises. The soft instrument system is mainly composed of four modules: data acquisition and preprocessing, auxiliary variable selection, model development and application, and model correction. Soft instrument modeling methods mainly include mechanism modeling, data-driven modeling and hybrid modeling. The establishment of an accurate soft instrument model and the realization of on-line real-time monitoring and closed-loop control through assay analysis and correction are of great significance for guiding the refining production operation, reducing the frequency of assay and improving the economic efficiency of the unit.

The application of fieldbus radar level gauge in the level detection of storage tank

2023, 59(2): 0-0.

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Radar measurement is widely used because of its large measurement range, easy installation, high reliability and no influence of medium pressure, temperature and other changes. This paper describes the architecture and configuration of radar system for field bus storage tank and the precautions for the installation of the level gauge. A comparative analysis is made on the settings of the field bus type Raptor radar system and the non-field bus type Rex radar system by taking the design and application of a refinery product tank farm as an example. The practice shows that using Raptor radar system to monitor the acquisition signals of large tanks can reduce cable laying, and the field bus radar can really play its role in tank measurement.

Development and application of pipeline stress online detection system

2023, 59(2): 0-0.

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This paper expounds the mathematical principle, main technical difficulties, system architecture and components of pipeline stress online detection system. The article also introduces the application of this system in a gas field tunnel. The system detection data is analyzed in detail. Through the application of pipeline stress detection system in a gas field. The effectiveness of the technical principle, system hardware, data acquisition and analysis is verified. It can be applied to oil and gas field gathering pipelines and long-distance pipelines to provide quantitative support for ensuring the safety of pipeline operation

Design and implementation of Hart instrument and control loop fault intelligent diagnosis and management system

2023, 59(2): 0-0.

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In view of the requirements of centralized management of Hart instruments and precise location of control loop faults in DCS control systems widely used in the field of natural gas purification, this paper proposes the design and implementation of an online fault diagnosis and management system for Hart instruments and control loops based on DCS control systems. It is successfully applied to the natural gas purification plant, and the integrity management, fault diagnosis and online adjustment of Hart instruments are realized at low cost.

Research and application of drilling integrated intelligent system

2023, 59(2): 0-0.

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The field of big data has attracted wide attention. Under the environment of accelerating energy transformation, oil companies at home and abroad have actively sought information development and established intelligent data management platforms to enrich business components and accumulate business experience, focusing on efficient exploration and development and the construction of intelligent oil and gas fields. Put forward a set of drilling integrated intelligent system, supported by well site data, the applications of artificial intelligence to data monitoring and analysis, risk early warning, the effect evaluation index in many aspects, such as promoting drilling production work step by step implementation, to provide accurate production auxiliary decision-making, in to ensure the safety of drilling and improve drilling efficiency has played an important role.

Design of oil and gas field industrial control system architecture and safety protection strategy

2023, 59(2): 0-0.

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With the development of digital transformation in oil and gas fields, the integration of industrial control and the Internet of Things is deepening. The diversified application of the Internet of things brings serious threats to control systems with simple communication protocols and lack of security and defense capabilities. The production site has a wide range of areas and scattered distribution, so security hardening of each control system requires a huge amount of investment. Combined with the application status of oil and gas field industrial control and Internet of things (iot), this paper proposes the strategy of clarifying the scope, refining the safety domain and safety sub-domain, strengthening equipment and boundary access control, realizing the system security and low-cost reinforcement, and improving the level of safe operation in production.

Application of AHP in Alarm Classification of Gas SCADA System

2023, 59(2): 0-0.

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In view of the imbalance of alarm point classification and comparison in a gate station, a gas SCADA system alarm priority evaluation index system is constructed by using the multi-dimensional quantitative setting method of the oil and gas industry and combining with the enterprise production accident classification standard, and the weight value of each influencing factor is calculated by using the analytic hierarchy process, so as to divide the alarm priority of each alarm set point.

Study on Single Well Metering of Offshore Oil Platform

2023, 59(2): 0-0.

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est separators or multiphase flowmeters are usually used for single well metering in oil and gas production on offshore platforms, the multiphase flowmeters are divided into GLCC type multiphase flowmeters, standard type multiphase flowmeters and short section type multiphase flowmeters. The structure, working principle and working characteristics of test separator and several multiphase flowmeters are introduced, and the method of single well metering and selection is studied. By combining the type of oil and gas platform, oil and gas quality and other factors, the development of an appropriate metering scheme can meet the actual production needs.

Discussion on the Design of Syn Gas Compressor Control System

2023, 59(2): 0-0.

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For the control scheme of steam turbine compressor in process industry, this paper introduces the typical design of anti-surge control, turbine governor, overspeed protection system, machinery protection system and condition monitoring system. Moreover, a control scheme for synthetic gas compressor with 14MPa exhaust pressure has been described as an example.

Discussion on technology of extinguishing full Surface fire for large storage tank

2023, 59(2): 0-0.

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The large-scale construction of storage tanks has led to the continuous increase of operational risks. In addition, the strict accountability of national laws and regulations has improved the design level of storage tank fire fighting system and capacity. Based on the case law of foreign tank fire accidents, the necessity of preventing tank fire and full surface fire is proposed. It is pointed out that the supply intensity of foam in the fixed fire protection system of storage tank is low, and it does not meet the technical requirements for remedying the full surface fire of storage tank. The research status and practical experience of high-power and mobile fire-fighting equipment abroad are described. From the aspects of tank engineering design, foam supply intensity grade, product development and technical reserve, the paper puts forward suggestions and measures for the engineering design of large-scale tank fire fighting system, aiming to improve the level of tank safety management and emergency support capacity of fire protection system in China.

Demand analysis of intelligent P&ID and the application practice of one software

2023, 59(2): 0-0.

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When intelligent P&ID emerged, the feature of relating shapes and its data information makes it have pros and cons on the design work. The definition and tasks of intelligent P&ID is introduced, its application demands and the feature demands are analyzed, along with its inherent difficulties. Clarifying these pros and cons from the users’ aspect is aimed at giving directions to related software developers. Using AutoCAD P&ID, along with necessary program developed, the users’ application needs are well met with efficiency boosted.

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