1、 The application of PLC technique in the control of marine boilers Programmable foreword controller, Is called PC or PLC, It appears causes the control domain faced with a technical transformation Take the relay as the foundation engine room control device structure complex, the component are many,
2、The reliability is bad, The breakdown sometimes occurs The current our country ships use the import complete set control device, Its function consummates, The reliability is also high, But the price is expensive Number year ago, I use import PLC am the controller, Own design the hardware, Establishm
3、ent control procedure, Develops successfully the PC-GC programmable boiler combustion control installment, Substitutes for the English HAMWORTHY Corporation product In the near future the similar product will compare with this company, Performance quite, The price only is its 12.513.4 year, Altogeth
4、er has PC-GC to install 12 sets in Dazing 414 and so on 6 Strip oil tanker solid ship use, Experiences the South China Sea storm and the nearly 70 high temperature adverse circumstance tests, Moves good, Does not have a breakdown The experience indicated, Introduces the minority essential component,
5、 According to concrete control system request, Designs the appropriate software and the necessary hardware, Is the ships technological transformations and the equipment disposition good means 1 system composition The system is composed by below several parts: Programmable foreword controller PC； Pow
6、er source PS； Examination unit Cooperation unit OB； Actuation unit M； Display monitor IB； Auxiliary relay unit JB； Line bank L, Like chart 1 shows The first six parts are the control device basic composition This installment additionally builds auxiliary relay unit JB including four 8 ports intermed
7、iate relay J1, J2, J3 and J4 and 12 ports light controls relay JGC. When the controller output must actuate the high-power load, Needs to carry on the voltage or the power conversion through the intermediate relay The intermediate relay besides completes the host which it undertakes to control the f
8、unction, Also provides many vice- auxiliary ports, May use for the interconnection related equipment or put through the condition indicating lamp, Does this may save the host to control the unit the hardware resources After establishment line bank, The power source, the PC board, examine the compone
9、nt, carries out the component, operates the button, the display lamp and so on the complete contact all links to the line bank plug in, This for the equipment setup, the service and the search breakdown has provided the convenience System each part of compositions and connection。 2 Systems controls
10、request 2.1 Burning management control (1) Fuel oil choice The fuel may choose the heavy oil or the light oil If choice heavy oil, The oil temperature must in 80 above, The side can carry on burning The oil temperature is lower than 80 ,Then blowing-out, And the start heats up the installment to hea
11、t up to the heavy oil (2) Combustion control According to the start, front sweeps the gas, the ignition, opens the #1 spray hole, opens the #2 spray hole the order to start boiler burning； After closes the #2 spray hole, closes the order blowing-out which the #1 spray hole, sweeps was mad (3) Steam
12、pressure intermittent control According to boiler steam pressure p AND gate limiting value p1 (0.7MPa, p2 (approximately 0.6MPa) controls two spray holes approximately) the work When pp1,#1, the #2 spray hole closes； When p1pp2,The #1 spray hole alone works； When p2p,#1, the #2 spray hole opens。 (4)
13、 Boiler water monitor the boiler water level uses the pair of position control mode, which knew very well, Therefore, does not give relates in detail 2.2 Interconnection protections (1) Steam overpressure interconnection The steam pressure arrives reports to the police threshold value p0 (approximat
14、ely time 0.72MPa), Sends out the steam overpressure the warning, Blowing-out, And shuts off the load power source, Stops to all executions component power supply (2) The boiler water level reports to the police The establishment high reports to the police the water level and the lowest danger warnin
15、g water level When controls malfunctions, The water level surpasses reports to the police the water level, Then sends out the high water mark to report to the police, And shuts off the feed pump electric motor power source When the water level is lower than the danger warning water level, Then sends
16、 out the low water level to report to the police, Boiler blowing-out。 (3) The emergency blowing-out protects When the collection controls Taiwan to have the blowing-out to order, Then sends out the emergency blowing-out the warning, Boiler blowing-out (4)Heavy oil temperature control interconnection
17、 When choice heavy oil, The oil temperature is higher than 80 procedures to be able to move The oil temperature lowly is lower than this value, Sends out the warning, Boiler blowing-out (5) Flame surveillance unusual interconnection When appears the ignition defeat, the midway flameout or the burnin
18、g condition worsening, Sends out the flame surveillance to be unusual the warning, Boiler blowing-out (6) Manual, automatic operation interconnection only when cuts the switch to set manually (is automatic) the position, only then allows carries on manually (is automatic) all operations (7) The #1 s
19、pray hole does not work, Or the air throttle has not started in a big way, The #2 spray hole does not work and so on 3 Hardware designs The hardware design mainly revolves the system the reliability and the consummation its function two goal carries on 3.1 PC shaping The programmable foreword contro
20、ller uses, the excellent craft manufacture advanced, its reliability is the general labor controls the microcomputer 46 to double, Therefore should stress from the control function angle chooses PC. Regarding the single plane, the medium scale, use in guaranteeing the boiler safe operation the autom
21、atic control system, To conserves energy the goal to be possible not to consider, Therefore does not need the PID control function Such system by condition control, sequential control primarily, By the switch quantity logic operation, the time, counts is in the majority, To aspect the and so on comp
22、onent running rate performance does not have the special request, Therefore may act according to the procedure to need the capacity (IO port number and memory size) makes the PC shaping The storage capacity (procedure step) may) * (IO) make the estimate according to empirical formula Q=610,If the us
23、er program is not big, Saves The accumulator capacity demand is easy to satisfy This system altogether must input the port, output port each 14 (if increase boiler water monitor function, Must again increase the input, output port each 4),Therefore uses Mitsubishi Corporation F1-30MR or F1-40MR is t
24、he controllerF1-30MR is the subminiature programmable foreword controller, Its input, outputs the port with PC machine to assemble in together, Does not need to choose the IO module againF1 series PC does not have breakdown time interval MTBF is 300,000 hours, The mutable (0+55 ,Work；-15 +65 ,Stock),Bears the vibration, the impact (conforms to JISC0911, the C0912 standard),Adopts the power source protection, the supply voltage surveillance, the instantaneous power cut
