-
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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