Application of Industrial~(IT) in liquefaction plant and optimization control of air compressor
[5] The application of the system in the electric control of the instrument focuses on the multi-variable optimization control strategy of the air compressor automatically tracking the variable load operation of the liquefaction device.
Set of liquefaction equipment operating according to market demand, complete set of equipment and all supporting units including liquefaction equipment, 4±133 air compressor and nitrogen press, pressurized nitrogen press, normal temperature and low temperature freezer, 3 sets of 464 liquid Millet, circulating water system, liquid oxygen, liquid nitrogen and liquid storage tank monitoring are completed by [5, two operators complete the operation of the whole set of equipment, so the optimal control of the process is very important.
A-mail in-st stalIT is the Profibus intelligent field bus network automation control system platform, as an operator station or Wang Cheng Shi station, using the standard Windows NT operation interface size optional 1 plus 5 11 rack type 1 / 0 0 [5 systems. This set of liquefaction equipment adopts the power redundancy, [0 å…€ and total, line balance configuration, to achieve comprehensive monitoring of instrumentation. [5] Completed the control strategy, electrical control logic and various interlock protection of the whole set of equipment, totaling more than 500 actual 1/0 points. Based on the allocation of system resources, the inter-station communication is reduced, and the program structure is optimized to make the system run at low load. The system sets up various levels of alarm information for instant printing and provides operators with reports for various times. A large number of real-time and historical trends are regularly archived for Wang Yi personnel to analyze the process of the king, as historical data for the operation of the liquefaction unit.
When the liquefaction device is operated under load, the air compressor discharge amount is required to be adjusted accordingly while maintaining a stable exhaust pressure.
In the adjustment process in which the air volume of the air compressor is matched with the load of the liquefaction device, the independent control means for the inlet guide vane and the vent valve cannot be adapted to the variable operating condition of the device. Utilizing the rich software function of Yi 88, according to the air compressor secondary nozzle pressure difference, the second-stage pressure difference, exhaust pressure and other parameters, plus motor temperature, cooling water temperature, exhaust temperature and The alarm and interlock protection of the parameters of the shaft vibration can realize the multi-variable optimization control by shaking.
The following is a description of Atlas's control of the air compressors for the Portuguese liquefaction plant. The displacement is 700013/, and the discharge pressure is 5.
263 eight process diagram as shown in Figure 1 oil road omitted.
1 Control Introduction The output flow of the air compressor is limited by the opening degree of the inlet guide vane. According to the change of the required gas volume of the liquefaction equipment of Shengshan Qiao, the air compressor flow fluctuates from 0100, that is, the opening degree of the inlet guide vane changes. The output pressure of the air compressor will also fluctuate, so the stability must be maximized. Figure 2 is a control schematic diagram.
2.2 The limit of the flow control in the start-up phase is controlled. When the air compressor is started, the difference between ¥ and 5 is larger, the output amplitude of 101 is larger, and the opening speed of the inlet guide vane is too fast, which will cause air pressure. The exhaust pressure of the machine is sudden or even overpressure, which causes an impact on the liquefaction device. A start ramp limiter is set for this purpose: within the minute after the air compressor is started, the output value of 11 is subjected to the upper limit of the output value. That is to say, within this minute, the output value of the PID is compared with the value of the ramp output and always takes a small value of both.
蜀3 Rear anti-surge control and surge protection of the air compressor 23: Surge characteristics of the air compressor: rapid flow reversal, excessive compressor vibration, fluid medium temperature increase, noise noise near the machine Increase, cause air compressor jumps, etc. The consequences of surge are severe: shortening the life of the compressor, reducing efficiency, and mechanical damage to seals, bearings, and vanes.
Air compressor surge can be simply described as a sudden change in the flow or output pressure within the impeller. When the air compressor surges, it will cause devastating damage to the mechanical equipment, so it must be completely avoided.
The anti-surge control is mainly completed by the port 12: the ratio of the differential pressure on the secondary inlet nozzle to the differential pressure before and after the secondary is used as the actual input value of 13, ¥ actual value = differential pressure before and after the secondary nozzle 063 [two Level differential pressure 063 constant setting value = surge value safety domain value air compressor anti-surge vent valve is a qi valve. In the port 13, the actual value, ¥ is compared with the constant set value 5, if the actual value falls below the set value, the output signal of the controller port 13 is decreased, so that the control vent valve is opened; if the actual value is PV Rising, exceeding the setting of 4, Shengshan Qiao, the controller, 13 output signal is reduced, so that the control vent valve is opened; if the actual value, ¥ rises, exceeds the set value, the controller output signal increases, control The vent valve is closed. According to the requirements of the field surge test data and the flow rate of the liquefaction device, the constant set value 5 is set to 80. [5 The control system determines the surge method by setting the discharge pressure of the air compressor to occur 5 times within 63 as shown below. The change from the peak to the slope amplitude, the air compressor entered the surge zone, and the surge protection was carried out within 0 [5: the air compressor surged, 0 [5 sent a pulse signal, control the field venting The two positions on the diaphragm head = the solenoid valve, the solenoid valve coil is de-energized, and the gas on the membrane head is vented through the solenoid valve, so that the gas-closed venting regulating valve is fully opened; at the same time, the pulse signal is sent to the air pressure electric control The system interlocks the air compressor.
The function of the port 13 controller is: as the air-filling device flow demand plus the vent valve is closed, the inlet guide vanes are opened; when the flow demand is reduced, the vent valve is opened, the inlet guide vanes are closed, and the air compressor output is kept. At the same time of the constant force of the foot force, when the flow rate matches the need of the liquefaction device, the guide vane is fully closed.
3 Conclusion plus 5 buckles 1 [5 to achieve a complete set of liquefaction device instrument control shake and air compressor multi-variable optimization control, after on-site commissioning, air compressor anti-surge test, driving after a period of time, adjust each比例0 controller's proportion and integral setting value to achieve the best match. The practice proves that the scheme has advancedness and reliability. During the operation, with the change of the liquefaction device operating load, no operator intervention is required. It can realize the control requirements of automatic constant pressure tracking.
Manufacturing Automation Technology Exchange Conference and Call for Papers Organizer: China Mechanical Engineering Society Supported by: China Machinery Industry Federation Time: October 10, 2002 Location: Shanghai Organizational Unit: Beijing Mechanical Engineering Automation Research Institute China Mechanical Engineering Society Machinery Industry Automation Branch China Automation Society Manufacturing Technology Special Committee Machinery Industry Automation Productivity Promotion Medium Manufacturing Automation Magazine National Industrial Automation System and Integration Standardization Technical Committee Manufacturing automation is to realize the development of the national economy, modernization of national defense, strong Key technologies for the competitiveness of the enterprise market, the development of various pillar industries and the various sectors of the national economy. On October 10th and 12th, 2002, the China International Industrial Automation Exhibition was held in Shanghai. During this period, the Industrial Automation New Technology Development Forum and the Manufacturing Automation Technology Exchange Conference will be held. The event is a collection organized by the China Mechanical Engineering Society. Academic exchanges, information exchange, and results display are the series of activities, strengthen the combination of scientific research and production, and promote high-tech and practical information automation technology to promote the rapid development of manufacturing. The exchange will publish a collection of papers, which will be published by the Manufacturing Automation Journal, which is a double-effect journal for Chinese periodicals, an excellent journal for the mechanical industry, and a journal for statistical sources of scientific papers.
The main content of the essay: domestic and foreign manufacturing information, network, intelligent development status and trends; fieldbus technology and applications; networked manufacturing technology and applications; 1611/66/86/A and FS, V, VE, IE, etc. Development and application of technology; green design and manufacturing technology; application of industrial control software and computer aided software engineering ASE technology in manufacturing; numerical control and robotics; development and application of manufacturing informationization and standardization technology; Industrial automation and application technology.
Essay deadline: June 30, 2002, please apply for the essay as early as possible: Please author the paper to use the Word format A4 paper laser printing copy to send the floppy disk to the Secretariat. Please indicate that the creator is tired, single, chemical, by fax, by post. I cleverly åŸã€…~ Qiao Biao Qiaozi 1 consulted. Specific notice when the paper is accepted.
Representatives attending the technical exchange meeting can hear it. Experts from the Institute of Industrial Automation New Technology Development Forum, the sisters of the Institute, and the experts, welcome to contact the conference and visit the exhibition.
Regarding this event, the Association will seek partners, and partners are willing to contact us.
Paper mailing address: Beijing Machinery Industry Automation Research Institute, No.1, Deshengkou, Beijing, China Postcode: 100011 Contact person: Cui Surong, Li Xiaodong, Hao Shufen, Zhang Yu
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