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Based on the research of PLC temperature control system of b

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-02-18 17:05
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2021年2月18日发(作者:associate)


Based


on


the


research


of


PLC


temperature


control


system


of


boiler


Abstract: from the development condition of boiler, PLC type selection, system software


and hardware design, communication up and down a machine, the configuration program


design is


presented in


several aspects, such as. By the


temperature control system of


PLC debugging the advantages of the simple, low cost, easy to maintenance, and easy to


expand


to


the


corresponding


field


of


industrial


control,


good


portability


is


of


great


importance to the industrial development


Key


words:


PLC;


The


sensor;


Temperature;


The


automatic


contro


With the continuous development of economy, the environment problem increasingly


prominent. Boiler as the heating system is one of the most important energy conversion


device energy consumption is huge, every year the national boiler combustion of more


than one third of total energy consumption. At present, the domestic most of the urban


heating


system


in


the


operation


of


the


boiler


equipment


aging


basic


rely


on


manual


operation, automation level is low, safety performance is poor, the combustion efficiency is


not


high,


the


air


pollution


is


very


serious.


Therefore,


the


configuration


of


automatic


temperature


control


system


for


boiler


in


today's


increasingly


serious


environmental


pollution situation is extremely important.


1 boiler temperature control based on PLC is introduced




This


system


is


based


on


PLC


boiler


temperature


control,


through


the


boiler


internal


sensor for temperature and flow rate feedback to system parameters such as temperature


control, the automatic control of boiler temperature is realized.




PLC


programmable


controller


is


a


kind


of


combined


relay


controller


and


computer,


through the installer, central processing unit CPU as the core and I/O devices connected


to


its


use


in


the


field


of


industrial


control


computer


is


slightly


different


with


ordinary


computer, mainly by the CPU, memory cell, basic components such as the I/O interface


circuit,


power


supply,


plus


extension,


programmer,


external


equipment,


etc.


PLC


programmable controller can not only replace the ordinary relay, but also has A variety of


extensions, such as A/D module, etc. Therefore, the use of PLC for automatic control of


boiler provides a new solution, some advanced control method to the application.




Using PLC programmable controller for boiler system, realize the automatic control of


the temperature, on the one hand can improve combustion efficiency, reduce fuel use and


emissions of harmful gas in flue gas, reducing the air pollution; PLC control system, on the


other hand, through a variety of sensors inside the boiler temperature, pressure, flow and


other


related


parameters,


realized


the


automatic


control


of


the


parameters


such


as


temperature. Reduces the manual labor, basically just in the engine room control room


can fully understand the operation of the boiler, reduce the manpower cost, improve the


level of the automation management system.


2 the temperature control system design


2.1 the temperature control system design




This design by Siemens S7-300 programmable controller for the next bit machine, two


industrial control machine for PC. PC through industrial control software to realize early


warning


functions


such


as


alarm,


under


a


machine


adopts


Siemens


S7-300


programmable controller, realize automatic control, such as temperature, flow rate in the


boiler control level and safety guaranteed.




System


for


the


temperature


of


the


object,


and


using


PT100


type


thermal


resistance


sensors


inside


the


boiler


water


temperature,


and


then


passed


to


EM235


module


temperature transmitter, convert the signal through the PID arithmetic, adjusted to get a


stable


PID


parameter


values,


then


the


input


signal


to


the


silicon


controlled


voltage


regulator


to


control


the


voltage


of


the


heater,


achieve


the


purpose


of


regulating


temperature.


2.2 the temperature control system hardware design




1) the host system. Using two sets of industrial control computer host, one of them as


the main control machine, another one is complementary host, make double insurance.


Configuration


software


WINCCSP26.0


using


Siemens


industrial


control


configuration


software.




2) PLC programmable controller. Systems use Siemens SP - 300 - PLC programmable


controller. Its modular structure, easy to implement distributed configuration and high cost


performance,


strong


electromagnetic


compatibility,


resistance


to


shock


impact


performance


is


good,


in


a


wide


range


of


industrial


control


field,


become


a


kind


of


economical and practical solution. Variety of increasing performance of CPU and rich with


many


convenient


features


I/O


extension


module


(including


SM


signal


module,


communication processor CP


, IM interface module, etc.). The user can choose according


to actual application module.




3)


the


instrument


equipment.


In


order


to


improve


the


anti-interference


ability,


type


selection


of


instrument


meter


DDZ


-


IH


45


ma


current


output


for


0123,


to


ensure


the


reliability


of


the


system.


Instrument


include:


flow


transmitting,


pressure


transmitter,


temperature


transmitter,


liquid


level


transmitter,


micro


oxygen


transmitter,


pressure


transmitter, etc.




4) the frequency conversion control room. Mainly includes: power supply control cabinet,


frequency


conversion


control


cabinet,


boiler


circulating


pump


frequency


conversion

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