Table of Content

20 July 2021, Volume 57 Issue 4

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Safety and Environment Protection

Research on risk evaluation of separator in gas transmission station based on RBI

Chang-Jing LIANG

2021, 57(4):  0-0. 

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Application of Electric Fire Prevention and Fire Appliances Power Monitoring in Petrochemical Industry

2021, 57(4):  0-0. 

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Innovation and Practice

Combustion control of tail gas online reduction furnace in natural gas purification plant

2021, 57(4):  0-0. 

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SCOT(Shell Claus Of-gas Treatment)sulfur recovery off-gas treatment technology can increase the total sulfur recovery rate to about 99.9 %，which was widely used in natural gas purification. In this paper, according to the process characteristics of tail gas treatment unit in a high sulfur natural gas purification plant, the proportional crossover limit control system is used to control the air distribution and furnace temperature of online reduction furnace. Furnace temperature can be controlled in the normal range because of the automatic control system. The furnace always keeps 1ack of oxygen combustion and exists the reducing gas(H2，CO), which provides a basic guarantee for the reduction and absorption of process gas. The automatic control system further increases the sulfur recovery rate and reduces the SO2 emission.

Development and Commentary

Construction practice of intelligent natural gas purification plant

2021, 57(4):  0-0. 

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Engineering Design and Standards

Engineering Design of Temperature Measurement for Petrochemical Hydrogenation Reactor

2021, 57(4):  0-0. 

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Hydrogenation process is an important petrochemical process widely used in recent years. Hydrogenation reactor is the core equipment in hydrogenation process unit. Ensuring the safe, efficient and economic operation of the reactor is the core work. Therefore, it is necessary to measure the reactor temperature to ensure the process conditions, protect the reactor and protect the catalyst.

Application of Leakage Detection System in High Pressure Equipment in Urea Process

2021, 57(4):  0-0. 

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Since the industrialization of urea production in 1960s, various processes have gradually become mature, equipment structure and supporting schemes have been continuously improved, and the production scale has also developed towards the direction of large scale. The typical urea process consists of full cycle of aqueous solution, carbon dioxide stripping, ammonia extraction and aces energy saving process [1,2]. However, no matter which process is used, urea synthesis tower, ammonium condenser, stripping tower and so on in urea high pressure equipment are one of the key equipment in urea production, and are also the most prone to leakage in the plant, its reliability directly affects the continuous operation cycle of urea safety production. Therefore, it is the most important to ensure the safety of urea production to find the leakage of equipment in time through the leakage detection system and to avoid the harm caused by leakage to personnel, equipment and environment.

Design and Application of Chromatograph in Cycle Gas from Gas Phase polyethylene

2021, 57(4):  0-0. 

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Regarding the sampling of Chromatograph in cycle gas from the reactor based in gas phase polyethylene (PE) process, the analysis component is complicated and the detection response time requires to be fast. At the same time, the samples are mixed with dust and particle impurities, and the analysis results are seriously affected by temperature. According to the process requirements of polymerization reaction and the physical properties of samples, this paper puts forward the special engineering design: 4-stage filtration system, high temperature heat tracing system, selection of sampling valve, and the strategy to shorten the transmission delay time. The performance of the sampling system is reliable, and the analysis results are stable and accurate, which can be used for advanced process control.

Some presentation of Emergency Block Valve in the related International Practices

2021, 57(4):  0-0. 

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While the emergency block valve (i.e.EBV) has been widely utilized in the domestic refinery project application, this article hopes to help the project design engineers to understand the background information of EBV technique requirement comprehensively, and to design EBV more reasonably, by introducing some presentation of EBV in the related International Practices.

Process and Technology

Research on PID tuning based on lambda method for Self-Regulating Processes

2021, 57(4):  0-0. 

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For over damping and under damping self-regulating processes, the method of PID tuning based on lambda is given. By using this method, through the step response curve of self-regulating processes, the basic parameters of PID parameter tuning are given by drawing method, and the PID parameters of controlled processes are calculated according to the formula. This method has a wide range of applications, and the obtained PID control parameters have strong robustness, which is a very advanced PID tuning method.

Automatic metering system based on SCADA system Development and application

2021, 57(4):  0-0. 

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To solve the problem of product oil pipeline with the first terminal oil pipeline library automatic metering system data sharing, under the condition of the shutdown don't need all of the first terminal and pipeline library comprehensive dynamic oil quantity of inventory and loss of real-time monitoring, and form of mass flowmeter metering equipment online monitoring and early warning mechanism, find fault in time to avoid the problem of oil quantity dispute.In this paper, an automatic metering system based on SCADA system is developed.The system is the first of its kind in the domestic oil product storage and transportation industry and has the value of popularization.

Dynamic Simulation Research of Crude Distillation Unit

2021, 57(4):  0-0. 

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Based on the needs of domestic refining and chemical enterprises' production equipment construction and production operation cycle in China, this paper proposes to apply dynamic simulation technology to realize the modeling of crude distillation unit of a refining and chemical plant. The virtual device developed by using dynamic simulation technology can verify the process flow and control scheme, by comparison with the actual device situation, the dynamic model can accurately reflect operating conditions of the petrochemical process units and simulate the real-time changes of the device process condition adjustment, and provides support for the technicians to gain in-depth understanding of the device and to study more advanced process schemes. At the same time, the application of the dynamic model can also provide a basis for the intelligent production operation and intelligent control optimization of the device in the future

Instrument and Meter

Research and application of digital electromagnetic heating device for wellsite crude oil

2021, 57(4):  0-0. 

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Most of the wells in Changqing oilfield have no associated gas, the gas heating furnace has been stopped, coal-fired heating furnace pollution of the environment. The digital electromagnetic heating device for well site crude oil is studied, and the structure and function of the device are mainly introduced. In 2020, it was used in two well sites in Tongzhai working area of No. 3 oil production plant of Changqing oilfield, replacing the existing gas heating furnace and coal heating furnace to heat crude oil, which has high thermal efficiency, safety, environmental protection and energy saving, at the same time, it can monitor and control the temperature and pressure of crude oil by electromagnetic heating.

Intelligentization and Information Technology

Research on Application of data sharing in gas pipeline industry

ZHANG TAO

2021, 57(4):  0-0. 

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Gas pipeline data are mostly confidential data. With the continuous acceleration of urban construction, the sharing of gas pipeline data in the public environment has become the focus of attention.In order to accelerate the informatization and utilization rate of gas pipeline data, the paper analyzes the current situation, sharing and related confidentiality policy of gas pipeline data. the situation of gas pipeline data confidentiality information and data sharing processing methods are studied.

Application of reciprocating compressor on line condition monitoring system in gas storage

2021, 57(4):  0-0. 

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Aiming at the common faults existing in the operation of reciprocating compressor, this paper analyzes the fault components, fault forms and fault characteristics, studies the on-line condition monitoring system of reciprocating compressor, introduces the composition and functions of the hardware and software of the monitoring system, and analyzes the types and installation positions of sensors. The system is applied to three gas injection compressors in wen96 gas storage to improve the fault diagnosis ability of compressors, realize predictive maintenance, reduce unnecessary losses caused by unplanned shutdown, and ensure long-term safe and stable operation of compressors.