Far, smart 300 series PLC application in the power plant ash

a, technological process and control requirements 1, eight sets of a thermal power plant boiler system work process, including three per boiler electric dust collecting device, includes a set of each electric field ( Two) Storehouse pumps, each warehouse near pump configuration a local control box, using the manual switch on the control box disk, the valve can be manually operation and commissioning. Below with a single warehouse pump as an example to illustrate the process of concrete. In the boiler flue gas dust fall into the ash bin after through the electrostatic dust collection, ash warehouse bottom with warehouse pump, pump ash through the ash conveying pipe into the storehouse. Under automatic control operation, specific technological process is: when no ash in the storehouse pump, open the lock valve to delay 5 s, open the charging valve - delay 5 s - pump feed rate reached set value (when the storehouse Time/weight/manual) - material level signal to - shut down when feeding valve to delay 5 s, closed lock valve to determine whether the mother tube pressure in place/whether ash tube pressure pump/judgment in this system there is no other storehouse ash, all conditions meet to open the discharge valve, delay 5 s to open a valve, delay 5 s to open the secondary air valve after 1 min, check ash pipe pressure, when the ash pipe pressure is lower than the set point to close a valve, delay after 20 s to close the secondary air valve, close the discharge valve to complete an ash cycle. When ash pipeline jam, the system sets the row of plug valve, dredge ash pipeline by negative pressure against smoking. After closing a valve, delay after 20 s close the secondary air valve. Purpose is to ensure smooth ash pipeline, avoid pipeline jam. 2, control requirements, 1) To realize the automatic process of ash, for ease of operation adjustment and emergency treatment, should be able to switch to manual control at any time; ( 2) When operating the indoor 'remote/local' switch to 'on' position, automatic stop ash; ( 3) Warehouse feed weight of the pump and dual control feeding time, any feed or feed weight requirements are treated as warehouse pump is full; ( 4) The same ash pipeline can only have one storehouse ash pump, an electric field with a grey tube, to satisfy the priority ash ash conditions, two, three, the electric field to share a grey tube, to meet the conditions of ash ash priority; ( 5) When the ash after the pipe blockage ( Grey pipe pressure is greater than 550 kpa) , alarm indicator lights give sound and light alarm, until the ash pipe blockage troubleshooting; ( 6) When the mother to the gas pipe pressure is less than 400 kpa, the system automatically stop running. Second, the control system constitute the system chooses far smart YEZN - The type 300 programmable controller. YEZN - 300 is a modular medium-sized PLC system, can satisfy the middling performance requirements. The control system is mainly composed of the main control cabinet, field control box, a number of measuring sensor and auxiliary appliances ( Weighing sensor, pressure sensor, electromagnetic valve supplied by manufacturers supporting etc. ) , etc, have warehouse remote automatic, remote manual pump operation, field manual three kinds of control mode, control mode of the ark of the conversion is controlled by Settings in the main switch. Switch to automatic position, click on the images to use warehouse pump, can choose one way. YEZN - 300 series PLC controller as hangzhou far intelligence at the core of the product, has the following characteristics: ( 1) Function: strong computing performance, perfect instruction set. ( 2) Fast: instruction processing extremely fast, powerful CPU only 0. 3 ms can handle 1024 binary statements, also performed well in terms of word processing; ( 3) General: high-performance template and six kinds of CPU for any occasion, extension to three extension module frame, user friendly WINDOWSSTEP7 programming; ( 4) All fully integrated, modular, reliable running, convenient operation, especially suitable for the relatively poor working condition. This system by the power supply module of PLC controller, the analog input module, digital input module, digital output module and the central processing unit. Three 1, system interface design, software design, system interface and system operation subsystem main picture. In the system the main screen, can choose to operate on a storehouse pumps and start-stop system. In a picture of a operation, operators can observe each storehouse the workings of the pump, pump can also be used for each storehouse for remote operations or according to the operation condition to modify the parameters of the system, to ensure the normal operation of the system. After failure, fault processing can be operated in the picture. Four, the conclusion project with PLC controller technology, the reliability of the system is improved significantly. By actual operation performance of the system is stable and reliable, whether meet the technological requirements.
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