PLC control application in ammonia synthesis catalyst crushing process

Abstract: this paper mainly introduces the programmable controller ( ＰＬＣ) Crushing process in ammonia synthesis catalyst manufacturing process control application. Key words: PLC controller; The catalyst; Application of Chinese library classification number: identifier of TP2 literature: A article number: 1007 - 6921 ( 2007). 04 - 0085 - 02 ammonia synthesis catalyst is indispensable in fertilizer production industry is an important catalyst, there is a broken in the process of its production process, production process is shown in figure 1. Material from the hopper through the feeder to jaw crusher imports, after crushing from export to the bucket elevator, the elevator up to sieve screening machinery, and into the next procedure. 1 1 system control requirements. Procedures for automatic working status in the automatic program work condition, Selector switch X3 to play in the automatic program) , when the initial state, feeder, crusher, hoist and sieving machine are closed, when press the launch button X0, in order to avoid crusher crusher cavity material accumulation and cannot be started and material blocked in the elevator and make the elevator doesn't work, so the inverse direction of material transfer according to certain time interval sequence start-up devices, its startup sequence is: sieving machine - — — Hoist - — — Crusher - — — Feeder, adjacent intervals for both 5 s. When press the stop button X1, in order to make the sieving machine, hoist, and leave no residual material in crusher, request the material transfer direction in a certain time interval in order to stop the equipment, the stop order is: the feeder - — — Crusher - — — Hoist - — — Screening machine, adjacent to the two time intervals for 10 s. 1. 2 manual program working status in manual work condition, Selector switch X3 in manual program file) Every equipment is relatively independent, can all alone to start and stop. The working status generally need not, is only used to repair a equipment. 1. 3 failure state in the system design, parking motor four devices have been equipped with JR16B - 20/3 type thermal relay, when the motor is caused due to overload of thermal relay action, are connected to the PLC through the normally closed contact of the action and make the motor stop working, and to protect the motor, improve the security and reliability of the system is running. In addition, the use of thermal relay 95, 98, a normally open contact action, in order to stop the other machine, specific as follows: when parking sieving machine is broken, should make the feeder, crusher, and at the same time improve machine stop work; When the elevator down parking, should make feeder and crusher to stop working at the same time, the 10 s stop screening machine; When parking breaker failure, should make the feeder stop working at the same time, the 10 s stop winding machine; In 10 s stop screening machine; When the feeder fault parking, 10 s stop crusher; In 10 s stop winding machine; The last 10 s stop screening machine. When a failure happens after parking, should disconnect switch K1, cut off the PLC controller power supply, check the motor overload, and reset the thermal relay, and then close the switch K1, press the start button X0, enables the system to work normally. 1. 4 stop state when some accidents happen during production, can begin emergency stop button X2, make each output of PLC controller are banned, so that the emergency stop device. 3 conclusion since the system put into operation, everything is normal, fully meet the production requirements. In addition, in the design, should pay special attention to points: because of the broken process has a certain dust, so should pay special attention to the sealing of the electrical box to ensure that the PLC work environment ventilated clean; System should be good grounding right; Reasonable wiring, try to be the power cord and signal lines separate line.
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