Mechanical design and manufacturing based on the control of 6700 air compressor system Zhang Xiaoliang 1 Li Yao 2 Wang Yuhui 2 Li Gongfa 1 Yang Jintang Wuhan University of Science and Technology Mechanical Automation College, Wuhan 4300812 Hebei Iron and Steel Group Handan Iron and Steel Company, helium, 56015 pressure gas important task. The 03 system with advanced, reliable, flexible and easy-to-operate features is applied to the air compressor control system for configuration control. The actual operation results show that the air compressor system after configuration is more simple, intuitive and effective. The control of the system has a fixed 1 lead 0, 5, 1! Blood, blood, 57816 is a decentralized control system, which is commonly used as a distributed control system. It is a multi-level computer system composed of a process control level and a process monitoring level, which is a communication network. It is a combination of computer and communication. Control technology is the product of this new technology. 5700 is the 0 series, the system has the configuration flexible control function, perfect data processing, convenient operation, centralized man-machine interface, friendly installation, simple specification, convenient debugging, versatility and reliable operation. At present, it has been widely used in the manufacture of petrochemical machinery.
The effective control of the air compressor system not only saves energy, but also improves the service life of the equipment, which is of great significance for the entire air separation process. The 003 system generally adopts a dual redundant control unit. When a control unit fails, the relevant redundant real unit will switch to the working unit without any disturbance, which can ensure the safe and reliable operation of the air compressor system. This article uses 6 Yingxiu 03700 system also provides the function of multi-person simultaneous work, allowing multiple engineers to manage a project, and improving the control efficiency.
2 Air compressor system 2.1 Air compressor system introduction The air compressor system is to compress the air and provide the raw materials with different pressure levels for the subsequent equipment. For the air compressor system, the most basic control includes the start and stop control of the air compressor motor and the constant pressure control or constant current control of the outlet pressure. The specific use of constant current control or constant pressure control depends on the process selection, large air separation system. Constant pressure control is used. The rest of the control, such as air compressor automatic loading and unloading anti-surge control motor overload protection control air compressor start and accident interlock protection control are all designed for the safe operation of the unit.
The objects to be controlled in the air compressor system are two valve inlet vanes and anti-surge valves.
2.2 Air compressor system control requirements For air compressor and system control, it is necessary to consider the following aspects of control 0 constant pressure control material air compressor function is to meet the process requirements to send a constant pressure air flow, for the expander The main heat exchanger and fractionation tower provide feed air.
The anti-surge control surge condition is an abnormal working condition of the air compressor, which is a unique working condition of the centrifugal compressor and is very destructive. Once the air compressor surges, it will directly damage the air compressor equipment, which will cause air separation parking. In general, the anti-surge control of the compressor is an anti-surge valve.
Fault Interlocking Logic Control In order to avoid damage to the equipment, as long as one of the monitored parameters reaches the interlock value during the operation of the air compressor, the air compressor must be stopped. This is the basic requirement for air compressor interlock control.
Auxiliary Safety Control In order to ensure the safety of each device in the system, it is also necessary to add safe auxiliary control, mainly including protection control of high voltage protection and motor overload.
0 high pressure protection control, air compressor, excessive pressure, will have an impact on the normal operation of subsequent equipment. Therefore, it is necessary to set a safety protection range for the outlet pressure of the air compressor. The adjustment of the inlet guide vane opening degree can not achieve the purpose, using the protection regulator and the project Wu; Technical University 4. Equipment and Control Key Laboratory of the Ministry of Education, the Fund Funding Project 291 into the anti-shut regulator to adjust the opening of the vent valve, to protect the outlet pressure within the set range. The motor overload protection control adjusts the guide vane to reduce the load through the motor overload protection controller to prevent the air compressor motor from overloading.
3 Air compressor system control scheme 3.1 Anti-surge control of air compressor The outlet flow of the air compressor does not match the outlet pressure, that is, when the flow rate is low or the pressure is high, the air compressor will surge. The occurrence of surge will lead to serious consequences. The performance of the compressor is significantly worsened, the noise is increased and the vibration of the entire unit is aggravated. When the operating point of the air compressor is about to enter the surge zone, lowering the outlet pressure or increasing the outlet flow can prevent the air compressor from operating in a surge state.
The amount and exhaust pressure are related to a fixed curve. When the exhaust pressure increases, the air compressor operating point moves along the fixed curve, and the flow value is easily moved to the surge region; if the flow rate is reduced, the air compressor operating point also moves along the fixed curve, and the exhaust pressure ratio is also Extremely easy to move to the surge zone. Anti-surge control needs to take into account the pressure-pressure ratio and flow rate to form a set value. The set value is automatically changed by changing the flow rate as the above parameters change. In order to avoid surge caused by small pressure and small flow, the opening of the inlet guide vane can be adjusted to maintain the pressure and flow of the air compressor within a stable working range. The control of the guide vane uses the air compressor outlet pressure to control the inlet guide vane opening during constant pressure control. In some air compressors, the vane is controlled by the motor overload protection, and the motor overload protection loop output and outlet pressure control loop output are generally used. The high selection value controls the vane opening by feedback.
In addition to the inlet guide vanes, the air compressor anti-surge control object is mainly to control the anti-surge valve. When the pressure or flow in the air compressor is too large, the pressure can be released by the quick opening of the anti-surge valve. (2) The air compressor interlock program can set the relevant parameters of the anti-surge circuit to the interlocking condition, and control the air compressor to prevent asthma. Opening and closing of the vibration valve, 2.
Set the appropriate safety pressure value, 3 is the logical value of whether the air compressor stops signal. When the outlet pressure of the air compressor is greater than the set appropriate pressure value, that is, when the working point enters between the safety line and the surge line during the operation of the unit, the anti-surge valve loses power, and the inlet guide vane is slowly closed to a fixed angle. For the full opening 10, the compressor does not stop, and the air compressor system works at a small load. When the parking condition is satisfied, the air compressor stops, the anti-surge valve loses power, and it opens quickly, and the inlet guide vanes are slowly closed. When the air compressor is parked, the time required for the anti-surge valve to be fully closed to fully open is approximately 12. The high-performance valve is approximately 0.53 from fully closed to fully open. The control system adopts the 700 system of Zhejiang Zhongkong, supports the high-speed scanning cycle of 13, and appropriately adjusts the variable flow control of the 3.2 air compressor system between the control line and the surge line. Now the large-scale air separation process can be used at 75105. The load changes, which requires the air compressor load to change automatically. Within the surge control range, a cascade adjustment loop is provided to control the opening of the inlet guide vanes. The set value of the cascade is calculated by the program. The control scheme is as follows: the air compressor inlet guide vane is a program calculation block. The internal program is programmed according to the specific situation. For the air separation system, the oxygen production is converted during programming, and the additional amount is programmed when considering the molecular sieve system switching. The output is externally set as a smart regulator, and then passes through, still operating to control the vane valve.
3.3 Interlocking control of the air compressor system The interlocking of the air compressor is a very important chain, which involves the safety of the equipment of the air compressor. There are many factors that cause the air compressor to interlock and stop. For example, is the motor drive shaft bearing temperature, the motor drive shaft, the reverse bearing temperature, the bearing temperature, the large gear bearing temperature, etc., whether it is greater than the set value, and is the vibration amplitude of the 7th axis too high? More than 82.5, etc., if any of these values ​​are abnormal, the air compressor system will be interlocked and parked. When the air compressor system fails due to human factors, the air compressor can be stopped by the emergency stop button.
Implementation of 3.4003 Control 1 Create a system project. Create a new project, 4, and add the configuration server controller operation node and operation domain.
2 Configure the controlled object, log in to the configuration software, 5.
3 Open the controller from the configuration server, add the bit number to be measured to the bit number, and enter the user program programming. Then open the operating domain from the configuration server, add an operating group, perform process editing, alarm settings, and more.
4 After the process is completed, enter the monitoring software to implement real-time monitoring of the on-site controlled system. The monitoring system setting level authority is respectively the operator level engineer level administrator level. Each person corresponds to a unique user name and password. Each level indicates that the operator level can patrol the monitoring screen to view related records and confirm the alarm.
At the engineer level, the engineer level can also perform variable input remote operation.
The administrator level is above the engineer level and can also be managed by the user.
Mechanical Design and Manufacturing Analysis and Research on Forming Process of Plunger Deformation Mode Conversion in the 10th Day Yuan Yuhong 1 Peng Hong 2 Jiang Dingju 3 Teng Shengjing 4 Chen Da 41 College of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang 5500142 Guizhou Huachang Automobile Electric Co., Ltd., Guiyang 5500093 Guizhou Institute of Education, Guiyang 5500034, School of Mechanical Engineering, Guizhou University, Guiyang 550003, China Abstract In the process of composite extrusion of plungers, the flow of metal is a transitional mode. The flow law of metal is very complicated. Numerical simulation analysis was carried out for different process schemes. The slip line field theory is used to discuss the flow law. The slip line field and the speed end of the plastic deformation are given, and the flow direction velocity of the metal is predicted. It is pointed out that the defects of the forming process are generated; the correct process plan is determined. IS keyword composite extrusion; simulation analysis; slip line field; the reason for the suitable speed scheme is discussed and analyzed.
Process analysis of 2 parts The ancient mouth plunger body is a key part of the aviation hydraulic piston pump. It is in great demand in actual production. It can not meet the production requirements by traditional cutting, but the cold extrusion forming process can be better. Solve this question.
The cold extrusion of the plunger body conforms to the process characteristics of the cup-bar composite extrusion forming. According to the flow experiment of the metal, it is found that there is a flow mode of the cup-rod composite extrusion and the metal flow of the cold extrusion of the plunger body belongs to the transition mode. The flow law is complicated, and the theoretical analysis results of the extrusion process scheme of the parts are different from the actual flow modes, resulting in design failure. The numerical simulation can simulate the metal to a certain extent. It is a 30-forging simulation analysis software developed based on the finite element calculation method, which can effectively simulate the metal deformation process. We use the process in the research and development of such parts, numerical simulation, reasonable determination of the forming process plan, and the conclusion of the non-contracted date 2009126 fund project 黔科åˆå—20092049å·4End by analyzing the air compressor system control Features, using 3700 configuration software for configuration, real-time monitoring of the important parameters of the air compressor system, making the control of the air compressor system more intuitive and effective.
1 Cao Lige, Yang Xuefeng, Kang Duoxiang and so on. People, 8014 axial flow blast furnace blower, 3 control parts shape its characteristics are as follows 0 According to the size of the part, the ratio of hole depth to diameter is greater than 2.53, which belongs to deep hole extrusion, can not use simple positive extrusion and back extrusion Pressure, need to use composite extrusion, and how to ensure the process size of 20.76mm in the composite extrusion metal transition flow mode will be a difficult point of process design.
The material of the 2 parts is medium carbon low alloy steel. The maximum section reduction rate of the back extrusion part in the composite extrusion is 4265. The maximum section reduction rate of the positive extrusion part is 7,76, and the deformation degree of the composite extrusion should be within the allowable range. Inside, so the size of the blank should be determined correctly.
Upon completion, the final distance between the punch and the die is determined to be as small as the distance, squeezed 0. Metallurgical Automation, 2002, 26 Shan 2 Li Zheng. 0 application in air separation equipment. Mechanical and Electrical Engineering, 200033 Shi Baofeng. Design of computer control system for 600 air separation unit, master's thesis.
Northeastern University, Shenyang, 20, 4 Xu Fugen. 80008000 air separation equipment variable load regulation research 1st degree thesis.
Beijing University of Science and Technology Beijing, 2005125 Guan Xiaohui. Automatic control of the air compressor in the air separation unit. Henan Chemical Industry. 2,5
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