Hollysys LK series PLC in the application of the biogas plant

Hollysys LK series PLC application in the biogas plant newmaker welcome to e hall exhibition hall 3 PLC PLC controller programmable controller, PLC programming cable. 。 。 Biogas combustion power is with the continuous development of comprehensive utilization of biogas in a biogas utilization technology, is integrating environmental protection, energy conservation and energy comprehensive utilization of new technology, it used in industry, agriculture or town life a large number of organic wastes ( For example: vinasse liquid, livestock manure, municipal waste and sewage, etc. ) By biogas generated from the anaerobic fermentation processing, drive biogas generator set power generation, and can make full use of the generating sets of waste heat in biogas production, make comprehensive thermal efficiency is about 80%, much higher than average 30 to 40% of the power generation efficiency, the user's economic benefit is remarkable. Biogas power generation using by hollysys LK series programmable controller ( PLC） Based automatic control system, redundant heat standby CPU configuration, greatly improving the stability, reliability and safety of biogas power generation process, and make system maintenance more convenient and quick, the system has been applied to a Beijing biogas power generation projects, running in good condition and got the user's praise. 1, the process of landfill biogas power generation system is introduced in this paper is divided into collection system, extraction system, purification system, power generation systems. Figure 1 biogas power generation process flow diagram collection system composed of well pipe and well head, pipe network and condensate collector. Extraction system adopts the roots blower vacuum suction landfill gas to gas well of negative state by set. The swept volume could be regulated and controlled by the valve, the suction pressure by roots blower adjustment, in order to obtain stable gas production. Purification system including condensate separator and dust filter, etc. , the former is mainly remove the moisture in the gas, the latter mainly removing particulate pollutants in biogas, so as to avoid its into the wear and tear generators in power systems. After preliminary purification of gas to pressure fan, pressure boost after the after cooler, after further filter filter coalescer, filtered air again after two filter points two road into the gas machine output power. Power system will be sent to the electricity grid. 2 biogas power generation, automation control system design of automation control system for gas treatment system and process parameters of the process of biogas power generation system, electrical parameters and equipment running status monitoring, control, interlock and alarm, and print it, through the use of a series of communication chain, necessary to complete the whole process of data acquisition, data communication, sequence control, time control, loop adjustment and upper monitor and management, and other functions. Figure 2 schematic diagram of the automatic control system the whole system consists of one central control room, two PLC control station ( In gas processing system, biogas power generation system) Composition. The PLC control station by the LK series programmable controller ( PLC） System and testing instrument, the all process of biogas power generation decentralized control; And by the central control room PC shall be subject to the centralized monitoring system. The central control room the data communication between PC and PLC control station and high-speed, real-time industrial Ethernet, the communication rate of 100 MBPS, transmission medium is shielded twisted-pair cable. The scene of the PLC control station for the machine hot standby redundancy, the PLC signal collection site, and then through the industrial Ethernet control and monitoring computer data communication, the control method adopts the 'full open full distribution method. Control system is divided into three levels of management, including management level ( Center control room) , the control level ( PLC control station) And the field level. 3, system function & middot; PID figure display function has multiple window, alarm screen, trend diagram, control and guide picture, fault diagnosis, parameter modification picture such as monitoring, dynamic picture. Security functions respectively set operator and enter the password system. In running environment, shielding Windows all hot keys, and free access to locking system. After the system is powered on automatic recovery running state. History data management, access to all collected data set arbitrary clearance and access mode. , print report regularly according to user-defined report format, alarm and random print. Record events and internal clock can distinguish in chronological order and management, and can display and print in time. Database interface and data communications have openness can accept any task of real-time data access and exchange data with them. System has to copy and distribute function, distribute the information to the other general database applications, at the same time support SQL, ODBC or OLE DB application. All the data available symbols, such as: VALVE, MOTOR, etc. , required every time a change of variables may be monitored and processing. Operating functions according to the configuration, control the object of the specified screen with the mouse to switch or increase or decrease in operation. Loop response time is not more than 2 seconds. SPC, remote control, local control is adopted in the system the way of combining the electric door, pneumatic door, pump and fan control object in addition to the remote control in the control room, keeping the on-site operation. Step for the process control system with automatic, semi-automatic, fuck, key operation and hand on the five kinds of operating mode. In manual mode, the operator and switch off power motive and valves and other equipment, operating guidance for the LCD screen. On-site equipment failure, affect the SPC, in meet the related constraints, intervention can be leapfrog operational personnel. Equipment in situ operation mode, the upper machine operation is invalid.
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