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1、精选优质文档-倾情为你奉上 天津职业技术师范大学本科生毕业设计 英文资料与中文翻译专业班级：自1003班学生姓名：王晓东指导教师：邴志刚 教授学 院：自动化与电气工程学院2014年6月Application of control system on the base of PLC in sewage treatmentThe paper introduces a distributed control system of sewage treatment, and the core of the system is PLC. The structure of the control syste
2、m, the assignment and implementation of the tasks, the control scheme and the design concept of program are expounded. The way of central monitoring management and dispersing control is used by the control system; the long一distance control and monitoring of field equipment are uncharged of the upper
3、 computer; the software program of designs uses Intouch7. 0. The specific technology, equipment, the controlling of main parameter and several running data are uncharged of the PLC stations, and the software program of designs uses Concept 2. 2XL with online tracking and outline simulating. MB+ net
4、is adopted by the communication between the upper computer and the PLC stations, with its simply building net, quickly running and stable communication. The automatic control of PLC has been successfully completed in sewage treatment, which has improved the operation efficiency and management level
5、of sewage treatment equipment Introduced to take PLC as the distribute type control system of core in the wastewater treatment system of apply. Concretely described the structure, mission of the control system an allotment and carry out, the way of control and the thought of the program design. The
6、way controlled the concentration monitor of the system adoption a management and scattered a control, the place of honor machine be responsible for the spot the long range of the equipments control and surveillance, software adoption Intouch7. 0 draw up. The PLC native station is responsible for to
7、the concrete craft, equipment and is mainly controlled parameter to carry on control and collect various movement data, the program design adoption have on-line follow with off-line imitate the Concept of true function 2. 2 XL software. Place of honor machine and of the PLC adoption set the net be q
8、uickly simple and circulate speed, correspond by letter the stability strong MB net. The whole control system successfully solved the PLC controls a problem in the automation within wastewater treatment and raised a wastewater treatment equipments to circulate an efficiency and manage level.Recently
9、, for carrying out high quality, low consume, stable dependable movement. Domestic and international many wastewater treatment factories adopted a modern forerunner to control technique and calculator technique and constitute calculator direct, control thus, manage system. Make system excellent to t
10、urn movement. But the programmable logic controller(PLC) then take microprocessor as core. Synthesize the calculator technique automatically controls technique and correspondence technique but develops of a kind of new and in general use automatic control device. Have structure simple, function supe
11、rior, dependable sex Gao, work properly words in general use, be easy to plait distance, usage convenience etc. advantage etc. The silver City the first wastewater treatment factory adopted a SBR craft and take PLC as the control system of core, day after handling the sewage 10 104 t the processing
12、of reach mark sewage can used for an agriculture irrigation.1 Control system structureControl the way of concentration monitor management, scatter a control of the system adoption. The emulation hold, place of honor machine, gather a line machine, printer to Be located on medium control room, two se
13、t PLCs are located on control the spot. Adopt this kind of structure can make the information in the production line can centralized management with carry out whole operation, management with excellent turn. Also make to control dangerous dispersion in the meantime, raise the system credibility.1.1
14、The upper computersMedium control two calculator adoption PII class works of room to control machine, circulate the operate system of Windows NT. The place of honor machine be responsible for on the scene establish each long range control(full-automatic control, automatic control, order to move a co
15、ntrol) with surveillance, make use of Intouch7. 0 engineering software packages provide a good person machine dialogue boundary but obtain concerning parameter and equipments appearance information from the PLC by searching a way, keep a view manifestation to come out on the CRT by good sketch type,
16、 print a necessary data in the meantime and be provided for lord to control and manager instruction produce. Supervise and control boundary but include the system total diagram, system cent diagram, imitate the quantity general chart, parameter a constitution, report to the police a window, history
17、trend and register a window etc. boundary but. In the system total diagram, circulate the personnel can keep watch on signals, such as all movement appearances, equipments trouble and liquid which control an equipment and discharge etc. Operate a personnel in the system the cent the diagram can carr
18、y on a single machine point to move to circulate an operation to all control equipment, become the set automatically circulate operation or the whole factories full-automatic operation combine surveillance. In the meantime place of honor machine 2 and do a plait distance a machine. Medium control ro
19、om to establish another an inset type emulation to hold, is been one control by the place of honor machine, in order to keep the craft process of the view manifestation whole factory and main parameter value.1. 2 The PLC stand According to wastewater treatment of two part, the spot the long range of
20、 the equipments the control output and the spot the signal collect to control a station completion from two PLC wood ground.PLC1 native control station control the space grid, sewage promote a pump house, Pu spirit to sink sand ponds etc. to prepare a processing part. The PLC2 native control station
21、 controls dirty mire to dehydrate, press to filter machine etc. department.PLC3 native control station control SBR living creature processing part. Moreover, the on the spot native control station is each to establish an operation terminal to establish each, be responsible for at native to establish
22、 each control on the scene.(automatic control, order to move a control) The spot is each the physical parameter that the supervision order and include water level, temperature, discharge and turn soon, electric currents etc. imitate quantity, from to in response to of an appearance spread a feeling
23、machine or change to send to a machine examination to come out and change into the electric current signal of the 420 mA, through shield inside the PLC that the electric cable sends to each statures system, from the PLC picks up a people through various mold piece sample telecommunication number. Sa
24、me, imitate quantity control the signal send to performance organization by the 420 mA electric current form after being output by the PLC, control performance organization of action. The Quantum series PLC of Schneider company is satisfy liberal of, according to standard of network conjunction and
25、the spot total line conjunction etc. application the technique provided various network a choice, support Modbus, Mod-bus Plus(MB+), the long range I/0, TCP/IP etc. network conjunction, have stronger and vivid. Therefore, the wastewater treatment is convenient to arrive of the PLC choose the series
26、of MO of use Schneider.1. 3 Correspondences MB agreement is the M company release of an open type of the adoption IEEE802. 4 correspond by letter 5 agreements the spot total line of card agreement. MB the network together other networks compare to have a set of net simple, the investment be little,
27、network speed quick, correspondence the stability strong etc. characteristics, it make calculator, controller and other data sources through an usage double wring line or fiber optic cable Be a body to together carry on correspondence at the whole network top. But the CPU mold piece of the MQ series
28、 PLC imply MB correspondence, therefore correspond by letter a network to choose to use MB network. Medium control two machine, two control stations with native PLC of room to pass MB the network link together. The PLC CPU mold piece passes MB correspondence and two machines carry on data commutatio
29、n and collect the place of honor supervision various operation instruction of the system and the spot the examination signal and data, through analysis handle, pass exportation mold piece to control object output control signal; In the meantime, the PLC passes MB net upward the machine return to var
30、ious data, place of honor machine logarithms according to carry on an operation processing, show various signal and print various statement.2 The design of PLC control program The system has four kinds of control methods: The native hand moves a control, single set equipments point moves a control,
31、become a set, the equipments automatically controls, the whole factory equipment full-automatic control. Two kinds of ex- with general methods at establish each adjust to try or maintain usage, the system is mainly circulate with full-automatic control. Under this kind of way, all each kind of equip
32、ment from PLC according to in advance draw up of procedure auto control, dont need to operate a personnel an intervention. Various spot data spreads a highest machine through a PLC, come out in the place of honor on board description and make the craft, equipments movement of whole factories get an
33、overall control. The living creature processing part of the PLC3 station control is the whole wastewater treatment of key part, be limited by space, only with the PLC3 stand of program design for example.2.1 Process of controlThe PLC3 stations were used to control to get into Pu spirit from sewage,
34、the pond is everywhere sewage run off Pu after manage spirit the whole process of the pond. Include turn of sequence and time- switch moderate breezes machine of control various valve, pump, breeze machine to soon regulate etc. in this process .The Pu spirit pond is the core of wastewater treatment
35、to construct a thing, sewage is to come and go through a microbial living creature oxygenation in the pond in addition to organic matter, the processing effect of content to sewage of the oxygen in water is to go to a pass important .Request according to the SBR craft, the deliquescence oxygen in th
36、e Pu spirit pond content usually controls within the scope of 13 mgs/L and annoy a stage end to fuse an oxygen content in the Pu should be not over the 2 mgs/L. Contain the oxygen once measured low or lead Gao, all will influence a fluid matter quantity. Handle 4 sets of the 10 104 t the SBR of 8 po
37、nd modes to respond pond to the day, each one responds that the pond go together with a pedestal from change Pin machine control of breeze machine, used for annoying pond Pu spirit to by turn provide oxygen toward two Pus. Establish 4 pieces of deliquescence oxygen test instruments in the different
38、location of each Pu spirit pond, measure contain of sewage amount of oxygen in pond, the PLC separates a 5 mines to examine a deliquescence oxygen in a Pu spirit pond value each time, according to fuse oxygen of average value to control breeze machine to turn soon. If fuse oxygen low limit at the bo
39、ttom of the enactment, the frequency modulation breeze machine turns to soon increase 5%;If fuse oxygen Gao while set upper limit, the frequency modulation breeze machine turns to soon lower 5%.So, carried out Pu spirit pond to provide automatically regulate of the amount of oxygen, since avoided un
40、necessary energy loss, again excellent turned movement craft.2. 2 The design of PLC program The adoptive plait distance software is a Concept 2. 2 XLs. Concept is according to under the Windows of the PLC plait distance tool, have good customers interface, and have on-line follow and off-line imitat
41、e true function. The control procedure of PLC3 stations is divided into five procedure mold piece. (1)Public mold pieces of procedure use-include a beginning to start to turn part, hour cent second etc. ask pulse unit, SBR to respond a period enactment, fuse oxygen enactment.etc. (2)Order control mo
42、ld pieces of the switch quantity -the coordination control report to the police of circulate and related breakdown of equipment, such as each valve, pump and breeze machine.etc. The enter of SBR pond spirit valve, enter water valve, reflux pump, surplus dirty mire pump from PLC according to the craf
43、t of the wastewater treatment period time segment control, water valve from PLC according to craft time and super voice liquid the measured value of the instrument to control. (3)Protection mold pieces of the off-power-system power failure after, the PLC saves all appearance locks and make after tre
44、ating to add an electricity PLC instauration keep of the appearance continue to circulate. (4)Mold pieces of correspondences -use to complete PLC and various data transmission of place of honor machine.(5)Fuse an oxygen value to automatically regulate a mold piece-according to fuse an oxygen value t
45、o regulate breeze machine to turn soon and report to the police of related breakdown. The target which regulates to turn soon promises the be worth of deliquescence oxygen as 2 mgs/L in the whole Pu spirit period. Adoptive control strategy is as follows: The Pu spirit period beginning, the breeze ma
46、chine at top speed movement attains a 2 mgs/L in shortly of the hour ask by making deliquescence oxygen and take 5 mines as a period to examine deliquescence oxygen to be worth in the meantime. When fuse an oxygen value big at the 2 mgs/L, the breeze machine turns to soon descend 5%;When fuse an oxy
47、gen value small at the 2 mgs/L, the breeze machine turns to soon rise 5%.If the breeze machine turns to soon rise to allow of tallest turn soon, fuse an oxygen value return small then maintain tallest to turn soon at the 2 mgs/L. This kind of circumstance may annoy the last phase of period to appear
48、 in the Pu, but also will not clearly influence wastewater treatment quality.Supervise and control an exportation electric current of change the Pin machine value at any time in the Pu the spirit of the whole period, make it not exceed change the sum of Pin machine settle a value. If meet a surprise
49、d circumstance to make to output electric current exceed when the sum settle value, immediately lower breeze machine to turn soon. If the breeze machine turns to soon decline to allow of lowest turn soon, output electric current to return exceed the sum settle a value, then stop breeze machine and send out to report to the police signal in the meantimeAlong with automatic control technical development, the UNITANK craft