Application of DCS System in Light Hydrocarbon Recovery Unit

Abstract: The application information of DCS system in light hydrocarbon recovery unit is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: Aiming at the problem that the system of Lijin Light Hydrocarbon Recovery Unit is outdated and cannot meet the needs of normal production, the SmartPro distributed control system is used for system transformation. The system adopts modular structure and local network communication technology to complete the single-variable control. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of DCS system in light hydrocarbon recovery unit. Aiming at the problem that the system of Lijin Light Hydrocarbon Recovery Unit is outdated and cannot meet the needs of normal production, the SmartPro distributed control system is used to carry out system transformation. The system adopts modular structure and local network communication technology to complete the process from single variable control to multivariable Optimized advanced control, can perform all the requirements of display, monitoring, printing, alarm, etc., realize decentralized control and centralized monitoring and operation, natural gas processing capacity, stable light hydrocarbon production, liquefied petroleum gas production have been increased by about double. The Gathering and Transportation Light Hydrocarbon Maintenance Center is mainly responsible for the annual maintenance and renovation projects of crude oil stabilization and light hydrocarbon recovery units in the oil production plants of Shengli Oilfield. In recent years, due to the continuous promotion and application of new processes, new technologies, and new equipment, as well as the old and aging original equipment, and the low product output and quality, many stations and warehouses that have business with the maintenance center have undergone engineering renovations one after another. Using the DCS system, the maintenance center has successively undertaken the renovation projects of the light hydrocarbon recovery unit of Tuo 2 station, the Gudong light hydrocarbon station, the Chunliang crude oil stabilization and light hydrocarbon recovery unit, and the Lijin crude oil stabilization and light hydrocarbon recovery unit. Now, the application of the DCS system in the light hydrocarbon recovery unit will be introduced with the transformation of the Lijin light hydrocarbon recovery unit. 1 Overview Lijin Light Hydrocarbon Recovery Unit was built in October 1988 and put into operation in June 1991, with an original scale of 10×10000m3/d. After more than ten years of production and operation, many problems have gradually been exposed, mainly in the aging and serious corrosion of some equipment, the backward technology and system matching, especially the automatic control system can not meet the normal production needs of the device. On the other hand, with the decline of natural gas production and the major changes in the composition of raw gas, the safety production cannot be guaranteed and the economic benefits are poor. Therefore, the plant was shut down for reconstruction, with a scale of 5×10000m3/d. The transformation is not only conducive to safe production and environmental protection, but also can achieve better economic benefits. This transformation is divided into process, equipment, automatic control, electrician and other parts, among which the automatic control DCS system adopts the smartPro distributed control system to complete the data acquisition and monitoring [1-3]. 2 The system structure and function after the transformation The main premise of a successful automation system is a reasonable design scheme. At present, there are many kinds of automatic control systems. The main types are PLC, SCADA and DCS, each of which has its own characteristics. PLC (Programmable Logic Controller) has the characteristics of strong logic function, which is especially suitable for occasions such as logic control and sequence control. It mainly deals with discrete quantities. When there are many control loops, it is not convenient to use. SCADA (data acquisition system) is mainly used for remote data acquisition. The network is a wide area network, and the real-time performance of the system is not high, so it cannot be used for occasions requiring fast response. The main feature of DCS (decentralized control system) is that it has strong loop processing capability, mainly handles analog quantities, and the system network is a local control network, with good real-time performance, friendly man-machine interface, and rich fault diagnosis and alarm functions. easy to master“. Therefore, it is very suitable to apply the SmartPro system to the automatic control system in the reconstruction of Lijin Light Hydrocarbon Recovery Unit. 2.1 System composition The reconstruction project of Lijin crude oil stabilization and light hydrocarbon recovery unit includes electric dehydration unit, crude oil stabilization unit, light hydrocarbon recovery unit, tank farm, pump area, etc. Among them, the electric dehydration unit and crude oil stabilization unit share a set of Dcs System; light hydrocarbon recovery unit, tank area, pump area and other parts share a set of DCS system. Two sets of DCS control systems are installed in the crude oil stabilization control room and the light hydrocarbon recovery control room respectively. The DCs control systems installed in the two control rooms are relatively independent and can communicate with each other. The composition of the two sets of DCs systems is basically the same. The system adopts the SmartPr0 distributed control system of Beijing Hollysys Systems Engineering Co., Ltd., which is the product of the combination of computer technology, control technology, communication technology and graphic display (CRT) technology. The modern equipment for process management is equipped with 16 control loops and 31 detection loops, see Table 1. TI: temperature input signal K: thermocouple Pt: thermal resistance AI: analog signal input AO: analog signal output DI: switch input DO: switch output The whole system includes 1 I/O control station and 2 operators station (one of which doubles as an engineer station) and a report printer. The I/O control station is composed of four parts: the main control unit, the intelligent I/O unit, the power supply unit and the special cabinet, and completes the functions of on-site signal acquisition, engineering unit conversion, and transmission of data and diagnosis results to the operator station through the system network; The operator station is the most important human-computer interaction interface, which is composed of high-end industrial-grade computers, special industrial keyboards, etc. to monitor and manage the production site.

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