Automation in Petro-Chemical Industry

Research on the application of automatic tank level gauge

2023, 59(5): 0-0.

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Level data in the tank(vessel) is significant in the oil static gauge. It has become the development trend to obtain the level data of tank (vessel) by using mounted automatic level gauge.It is found in practice that the accuracy of the data obtained by the automatic level gauge is affected by the uncertainty of the instrument and the operating condition, among which the operating conditions play a major role. According to the influencing factors, suggestions that selection, calibration, installation and calibration of the fixed automatic liquid level gauge are proposed. The above suggestions help improve the accuracy of the level data by automatic level gauge.

Analysis of Typical Cases of Explosion Protection in Petrochemical Instrument Systems

Zhen LI

2023, 59(5): 0-0.

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Explosion proof instrument equipment plays an important role in the safety production of petrochemical industry. This article analyzes typical cases of explosion-proof instrument equipment from the aspects of selection, design, installation, and use, which has certain reference significance for the explosion-proof management of petrochemical instrument systems.

Numerical optimization algorithm for chemical plants based on differential game direct and indirect hybrid method

2023, 59(5): 0-0.

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Based on distributed dynamic optimization, differential game and the shortcomings of direct and indirect methods of numerical optimization in solving differential game problems, this paper proposes a numerical optimization algorithm for chemical plants based on differential game direct and indirect hybrid method. Firstly, based on differential game, this paper constructs the mathematical proposition of chemical plant operation optimization and its first-order optimality necessary conditions. In order to ensure the real-time convergence of solving large-scale dynamic optimization problems, this paper uses the first-order optimality necessary conditions (indirect method) to solve their optimal controls for several players in the game, and other players use the first-order optimality necessary conditions of the above players as constraints, and use the direct method to solve their own optimal controls. Finally, the effectiveness of the algorithm is verified by theoretical derivation and simulation case analysis. The algorithm effectively improves the real-time, convergence, accuracy and optimality of the solution of chemical plant operation optimization problems, and provides technical support for the improvement of chemical plant economic benefits.

Prediction of noise by industry control valve

2023, 59(5): 0-0.

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There are many factors that affect the noise of control valves in chemical plants, and the noise generation is also different for different fluid types and valve structures. When the valve noise is too high, it often indicates that there are abnormal operating conditions in the valve, and it will also damage the personal health of the on-site operators. This paper will discuss the noise generation process and prediction method of the control valve according to the relevant specifications of IEC and GB and some foreign relevant literature.

Discussion on the design of automatic control system of petroleum reservoir

2023, 59(5): 0-0.

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Aiming at the design of automatic control system of domestic petroleum reservoir, this paper discusses the aspects of tank measurement, flowmeter measurement and calibration, valve selection, fire detection and fire control with reference to national norms and industry standards, and provides some design experience for the design of automatic control system of petroleum reservoir.

Development of on-line monitoring and diagnosis system for key equipment of oil drilling rig

2023, 59(5): 0-0.

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Drilling pump and winch, as the key equipment of oil drilling rig, play a very important role in the normal drilling operation, the online monitoring and fault diagnosis system can collect the main status parameters of drilling pumps and winches, predict and diagnose the faults of the equipment. In order to solve the problems of high temperature, cold, high electromagnetic harassment and inconvenient laying of cable equipment in oil drilling site, a set of equipment multi-parameter signal synchronous acquisition and transmission system based on wireless WiFi module is developed. The system uses high-speed STM32H750 with built-in DSP module as the main control chip, and is equipped with signal processing circuit and WiFi wireless communication module. Multi-channel high-precision data synchronous acquisition is realized, and the data is further filtered, decomposed, modeling and other processing, and finally the data is transmitted to the computer software through wireless WiFi for analysis. The amplitude and frequency response error of the system is 1%, the amplitude linearity error is 1.8%, and the frequency error is 0.2%, which can meet the requirements of field acquisition. The calibration and calibration of Wuxi Institute of Metrology and Testing and the practical application of oil drilling show that the system has the advantages of good data synchronization, strong stability under high and low temperature environment, high acquisition accuracy, strong anti-interference ability and so on.

Research and application of online monitoring technology for energy conservation protection of water source wells

2023, 59(5): 0-0.

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Due to the large capacity of the electric submersible pump in the water source well and the small outlet pipe line, the throttling operation or reverse transmission of stray electricity is very serious; The water level cannot be detected and often experiences issues such as empty pumping and dry burning, which are unsafe. Research has been conducted on online monitoring technology for energy conservation protection of water source wells. This article introduces the composition of the water level monitoring system for water source wells, the principle and control process of the variable frequency constant pressure control system. The application of this technology has achieved variable frequency and constant pressure water supply for water source wells, which can remotely monitor parameters such as water level, outlet pressure, and outlet flow, as well as remotely monitor in real-time. It has optimized the working system of water source wells, ensured their normal operation and achieved energy conservation and consumption reduction.

Research and application of centralized calibration system for tank volume table of gas station

2023, 59(5): 0-0.

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In order to meet the needs of refined and intelligent management of refined oil sales enterprises, higher requirements are put forward for the accuracy of storage tank volume table in gas stations. This paper studies the role of centralized automatic tank capacity meter calibration in the quantity management of gas stations, and expounds the architecture design, core algorithm and function module of the self-developed tank capacity meter calibration system. Taking a company as an application case, the accuracy, stability and integrity of data collection have been verified by practice, and the results of tank capacity meter calibration can be fully achieved. It plays an important role in the research and application of digital transformation and innovation of quantity management of gas stations in refined oil sales enterprises.

Ethernet-APL technology may change the process industry

2023, 59(5): 0-0.

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Since the 1980s, the main communication means of process industry automation has been the analog communication mode of 4~20mA+HATR. With the successful application of Ethernet technology in the field of Internet communication, the upper communication of the control system has gradually adopted the modern network communication technology in recent years, but the bottom layer of the factory control network has also adopted the communication mode of 4~20mA+HATR in the 1980s. In 2021, the emergence of "Ethernet-APL", characterized by two-wire connection, long connection length, explosion-proof, simultaneous transmission of data and power supply and other additional requirements, will it impact the rule of 4~20mA+HATR? Through the interpretation and analysis of Ethernet-APL technology, this paper makes some technical preparations for the popularization and application of Ethernet-APL technology to control engineering in the future.

Practice and Application on SDN Network Technology for Intelligent Factories in Refining Enterprises

2023, 59(5): 0-0.

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Abstract：The concept of "software definition" has become a universal concept in the field of IT infrastructure. The traditional Ethernet method of "human adaptation network" has gradually presented drawbacks such as network rigidity, location binding, and complex operation and maintenance, which can no longer meet the needs of the construction and development of intelligent factories in refining and chemical enterprises. Our company innovatively applies SDN technology to build a new generation of flexible enterprise park basic network, subverts the traditional enterprise park network model with an application driven concept, achieves "network follows people", and ultimately moves towards a new pattern of intelligent driven network, promoting the innovative development of IT infrastructure construction in refining and chemical enterprises. This article summarizes thenew exploration of building a park network in intelligent factories of refining and chemical enterprises, and proposes considerations and prospects for the innovative development of SDN networks.

Study on Combustible Gas Detector Coverage Optimization of Skid-mounted LNG Filling Station

2023, 59(5): 0-0.

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In order to improve the early warning ability of leakage risk of skid mounted LNG filling station, this paper analyzes the technical characteristics and potential safety risks of skid mounted LNG filling station. In view of the potential leakage risk, the gas detection scene is analyzed based on the scene method and CFD simulation, the gas cloud distribution of gas leakage is simulated, and the coverage rate of gas detector is optimized. The results show that the risk warning method proposed in this paper can effectively identify the current risks of LNG filling stations, provide technical support for early leakage warning of skid mounted LNG filling stations, and effectively improve the level of safe operation.

Fire alarm method of chemical production workshop based on fuzzy neural network

2023, 59(5): 0-0.

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Application of Distributed Optical Fiber Leakage Detection and Safety Warning System in High-sulfur Natural Gas Pipeline

2023, 59(5): 0-0.

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In order to reduce the potential threats during the operation of high-sulfur natural gas pipelines, comprehensively and timely detect leaks and quickly locate them, a leak detection and safety warning system based on distributed optical fiber acoustic sensing (DAS) is proposed by analyzing the advantages and disadvantages of commonly used natural gas pipeline leak detection methods and comparing them with fiber optic leak detection methods. Introduced the structural composition, pattern recognition, on-site testing, etc. of the system. After on-site operation and application, it has been shown that the system is sensitive and can quickly collect signals for alarm, achieving comprehensive and real-time safety protection for high-sulfur natural gas pipelines, and improving the efficiency of leakage disposal.

Availability Analysis of Safety Instrumented Systems

2023, 59(5): 0-0.

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From the perspective of safety and risk management, the design of a safety instrumented system (SIS) needs to have high levels of safety and availability. Safety is measured through Safety Integrity Levels (SIL), while availability is measured by Mean Time to Dangerous Failure (MTTFspurious) and Mean Time to Repair (MTTR). MTTFspurious can be calculated using the spurious trip rate (STR), while MTTR is influenced by the product's maintainability design and on-site operational conditions.In practical production processes, system trips can result in significant economic losses. Therefore, both companies and users not only expect safety instrumented systems to be safe and reliable but also aim for minimal occurrences of spurious trips. This article explains the method to calculate the STR of safety instrumented function (SIF) loops using reliability block diagrams, determining the availability indicators of the safety instrumented system. It provides guidance and recommendations for hardware selection, system configuration during the design phase, and improving availability through maintenance conditions.

Discussion on design of Special regeneration isolation valve for Olefin cracking reactor

2023, 59(5): 0-0.

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Aiming at the characteristics of high temperature, high frequency sequential operation and strict sealing requirements of the special regeneration isolation valve for olefin cracking reactor, combination with its actual process operation conditions, the valve structure, valve body material, end connection, installation test and special design of isolation seal for the special regeneration isolation valve are analyzed and discussed. Reference for the design and selection of relevant isolation valve is provided.

Design and application of coiled tubing expert system

2023, 59(5): 0-0.

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In the process of transformation and upgrading of petroleum engineering, the information platform provides support for remote decision-making of on-site construction, but the application scenarios of professional data are limited. The developed coiled tubing expert system has the functions of engineering early warning and pipe life early warning, which can diagnose the complex fault trend based on the real-time operation data, accumulate experience and gradually improve the early warning accuracy. Field application shows that the expert system can effectively reduce the risk of field construction, improve the efficiency of CT operation, and enhance the level of CT operation management.

Application of safety instrumented system in ethylene glycol plant

2023, 59(5): 0-0.

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Safety instrumented system (SIS) plays an important role in the ethylene glycol unit. It should be designed based on the process characteristics of DMO reactor and SIL grading results. Using the corresponding SIL grade field instruments, controllers and actuators, the reliability and safety of the SIS system can be ensured. This paper focuses on the application and optimization of SIS system in ethylene glycol reactor, and provides a feasible scheme for the application of safety instrument system in chemical plant.

Research and Application of Key Technologies for Integrity Management of In-service Storage Tanks

2023, 59(5): 0-0.

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Storage tanks are important energy facilities, and serious losses can occur in the event of safety accidents. The state has paid increasing attention to the safety supervision of major hazard of large oil depots. Domestic standards for tank integrity management have been developed, but the supporting role of integrity management technology for the safe operation of tanks has not yet been fully utilized. Introduced the integrity management program for in-service atmospheric storage tanks, which includes five stages: data collection and integration, risk assessment, integrity inspection and evaluation, integrity evaluation response, and effectiveness evaluation. Based on the practice of domestic tank operation engineering, the key technical links and elements of tank integrity management were expounded. The research result is of great significance for guiding oil depot enterprises to scientifically and efficiently carry out tank integrity management work, and improving the level of tank safety management.

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