Boiler Instrumentation and Controls
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
computer science crazy
Super Moderator
******

Posts: 3,048
Joined: Dec 2008
#1
21-09-2008, 11:45 AM


Definition

Instrumentation and controls in a boiler plant encompass an enormous range of equipment from simple industrial plant to the complex in the large utility station.

The boiler control system is the means by which the balance of energy & mass into and out of the boiler are achieved. Inputs are fuel, combustion air, atomizing air or steam &feed water. Of these, fuel is the major energy input. Combustion air is the major mass input, outputs are steam, flue gas, blowdown, radiation & soot blowing.

CONTROL LOOPS

Boiler control systems contain several variable with interaction occurring among the control loops for fuel, combustion air, & feedwater . The overall system generally can be treated as a series of basic control loops connected together. for safety purposes, fuel addition should be limited by the amount of combustion air and it may need minimum limiting for flame stability.

Combustion controls

Amounts of fuel and air must be carefully regulated to keep excess air within close tolerances-especially over the loads. This is critical to efficient boiler operation no matter what the unit size, type of fuel fired or control system used.

Feedwater control

Industrial boilers are subject to wide load variations and require quick responding control to maintain constant drum level. Multiple element feed water control can help faster and more accurate control response.
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply
smart paper boy
Active In SP
**

Posts: 2,053
Joined: Jun 2011
#2
16-08-2011, 03:15 PM


.doc   Boiler Instrumentation and Controls.DOC (Size: 243 KB / Downloads: 129)
INTRODUCTION
Instrumentation and controls in a boiler plant encompass an enormous range of equipment from simple industrial plant to the complex in the large utility station.
The boiler control system is the means by which the balance of energy & mass into and out of the boiler are achieved. Inputs are fuel, combustion air, atomizing air or steam &feed water. Of these, fuel is the major energy input. Combustion air is the major mass input, outputs are steam, flue gas, blowdown, radiation & soot blowing.
CONTROL LOOPS
Boiler control systems contain several variable with interaction occurring among the control loops for fuel, combustion air, & feedwater . The overall system generally can be treated as a series of basic control loops connected together. for safety purposes, fuel addition should be limited by the amount of combustion air and it may need minimum limiting for flame stability.
Combustion controls
Amounts of fuel and air must be carefully regulated to keep excess air within close tolerances-especially over the loads. This is critical to efficient boiler operation no matter what the unit size, type of fuel fired or control system used.
Feedwater control
Industrial boilers are subject to wide load variations and require quick responding control to maintain constant drum level. Multiple element feed water control can help faster and more accurate control response.
Reply
seminar paper
Active In SP
**

Posts: 6,455
Joined: Feb 2012
#3
23-02-2012, 05:03 PM

to get information about the topic Boiler Instrumentation and Controls full report ppt and related topic refer the link bellow

topicideashow-to-boiler-instrumentation-and-controls--5411

topicideashow-to-boiler-instrumentation-and-controls

topicideashow-to-boiler-instrumentation-and-controls--24690
Reply
seminar paper
Active In SP
**

Posts: 6,455
Joined: Feb 2012
#4
24-03-2012, 03:45 PM

BOILER CONTROL AND INSTRUMENTATION


.pdf   Boiler Control and Instrumentation.pdf (Size: 105.63 KB / Downloads: 108)


YOU WILL LEARN HOW TO:

Understand the objectives of the principal boiler control functions
• Recognise and understand typical boiler control diagrams and
their design intentions.
• Contribute to the setting up and tuning of boiler control loops.
• Identify principles and design concepts governing:
• Boiler feed water control
• Furnace draft measurement and control
• Steam demand and firing rate control
• Main steam and reheat steam temperature control
• Flue gas analysis and fuel combustion trimming
controls
• Importance of boiler safety control and start-up
interlocks
• Explore advanced control strategies for improved boiler plant
efficiency

WHO SHOULD ATTEND:

Senior boiler plant operators, repairers and installers
• Control system engineers
• Instrumentation engineers and technicians
• Boiler plant commissioning engineers
• Operation, maintenance, inspection and repair specialists
• Mechanical engineers and technicians
• Design engineers
• Consulting engineers



INTRODUCTION
This 2-day workshop introduces the basic
practices of controls systems and safety controls
for industrial steam generating boilers. It focuses
on the control and safety requirements applicable
to most types of boilers from small gas-fired
units to large multi-fuel installations. The
workshop will provide training in how control
and instrumentation is designed to manage the
main variables such as drum water level , furnace
draft, combustion fuel and air conditions. Burner
management systems are introduced with their
principal features including flame safety systems.
The essential safety requirements for boilers and
burners are identified and the corresponding
safety interlocks are explained as practical
solutions in accordance with the latest safety
standards.



DAY TWO COMBUSTION CONTROLS

• The combustion process and its
requirements for efficiency and safety
• Coal, oil and gas firing types.
• Stoichiometric air and excess air
requirements
• Fuel-air ratio control and its measurements
• Firing rate controls and cross limiters for
improving dynamic response
• Methods for measurements of boiler
efficiency using analysers
• Application of optimising controllers

BURNER MANAGEMENT SYSTEMS

• Safety and performance requirements of
pulverisers, burners and igniters.
• Furnace safety standards and regulations
• Flame monitors and flame failure detection
• Start up protection and sequencing
• Furnace supervisory controls and shutdown
systems

STEAM TEMPERATURE CONTROL

• Superheater and attemperator
arrangements
• Essential control requirements
• De-superheater controls

STEAM PRESSURE AND BOILER LOAD CONTROLS

• Pressure and flow response characteristics
• Single boiler load control
• Multiple boiler installations and load sharing
controls


Reply
seminar flower
Super Moderator
******

Posts: 10,120
Joined: Apr 2012
#5
22-09-2012, 04:03 PM

Boiler Instrumentation and Controls


.pdf   Boiler Instrumentation.pdf (Size: 256.46 KB / Downloads: 28)

INTRODUCTION

Instrumentation and controls in a boiler plant encompass an
enormous range of equipment from simple industrial plant to the complex
in the large utility station.
The boiler control system is the means by which the balance of
energy & mass into and out of the boiler are achieved. Inputs are fuel,
combustion air, atomizing air or steam &feed water. Of these, fuel is the
major energy input. Combustion air is the major mass input, outputs are
steam, flue gas, blowdown, radiation & soot blowing.

CONTROL LOOPS

Boiler control systems contain several variable with interaction
occurring among the control loops for fuel, combustion air, & feedwater .
The overall system generally can be treated as a series of basic control
loops connected together. for safety purposes, fuel addition should be
limited by the amount of combustion air and it may need minimum limiting
for flame stability.

Combustion controls

Amounts of fuel and air must be carefully regulated to keep excess
air within close tolerances-especially over the loads. This is critical to
efficient boiler operation no matter what the unit size, type of fuel fired or
control system used.
Feedwater control
Industrial boilers are subject to wide load variations and require
quick responding control to maintain constant drum level. Multiple element
feed water control can help faster and more accurate control response.

BLOCK DIAGRAM DESCRIPTION

The block diagram of boiler control is shown in figure 1.the output
from the boiler ie, the steam outputs and the level of water is given to
transmitters. The output of transmitter is given to the controller which act as
level indicator controller and flow indicator controller. If there is any error
corresponding to desired set point, the signal from controller is given to the
converter which will open or close the valve and the water will be drained
out or filled according to required steam.

COMBUSTION CONTROL

A combustion control system is broken down into (a) fuel control
and (b) combustion air control subsystems. The interrelationship between
these two subsystems necessitate the use of fuel air ration controls.
The primary boiler fuels are coal, oil and gas. The control of gas
and oil fuels requires simplest controls- ie, a control valve in the fuel line.
The steam drum pressure is an indication of balance between the
inflow and outflow of heat. Therefore by controlling the steam supply one
can establish balance between the demand for steam (process load ) and
supply of water.

DIFFERENT TYPES OF COMBUSTION CONTROLS

There are three general types of combustion control schemes used
today: They are series, parallel & series-parallel controls.
In series control, variations in steam header pressure(the master
control signal) cause a change in combustion air flow which in turn results
in a sequential change in fuel flow. This type of control is limited to small
boilers having relatively constant steam load & burning fuel.
In parallel control, variation in steam pressure simultaneously
adjusts both fuel & air flows. This method is common to any size boilers.
In series-parallel, variation in steam pressure set points are used to
adjust the fuel. Flow to the above boiler since steam flow is directly related
to heat release of the fuel and hence the air flow, the steam flow can be used
as an index of the required combustion air.

FEEDWATER CONTROL

Feedwater control is the regulation of water to the boiler drum. It
provide a mass accounting system for steam leading and feedwater entering
the boiler. The water is admitted to the steam drum and after absorbing the
heat from furnace generates the steam produced by the boiler.
Proper boiler operation requires that the level of water in the steam
drum should be maintained within certain band. A decrease in this level
may uncover boiler tubes, allowing them to become overheated. An
increase in the level of water may interfere with the internal operation of
internal devices in the boiler drum. It is important to made that the water
level in the boiler drum must be above 50% all the time.
The water level in the boiler drum is related to, but is not a direct
indicator of , the quantity of water in the drum. At each boiler load, there is
different volume in the water that is occupied by steam bubbles. So if load
is increased there are more steam bubbles and this cause water to ‘swell’ or
rise, rather than fall because of added water usage.

SINGLE AND TWO ELEMENT CONTROL SYSTEMS

For small boilers having relatively high storage volumes and slow
changing loads ,single element control system is used. It controls feed water
flow based on drum level. Response is very slow because a change in
feedwater flow takes a long time to show up the level change. As a result
the steam drum causes water to increase and decrease in volume, resulting
in false measurements.
The two element system overcome these inadequacies by using
steam flow changes as a feed forward signal. This control is used in
intermediate boilers as well as large boilers. Here the flow and level
transmitters are summed by a computing relay and will be the set point for
feedwater. Here the response is faster.
Reply
seminar tips
Super Moderator
******

Posts: 8,857
Joined: Oct 2012
#6
05-11-2012, 03:11 PM

to get information about the topic "boiler instrumentation and controls" full report ppt and related topic refer the link bellow
topicideashow-to-boiler-instrumentation-and-controls--5411

topicideashow-to-boiler-instrumentation-and-controls

topicideashow-to-boiler-instrumentation-and-controls?pid=113026#pid113026
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Report on HVDC Controls seminar projects maker 0 473 24-09-2013, 03:08 PM
Last Post: seminar projects maker
  DEISGN OF INSTRUMENTATION AMPLIFIER project girl 0 314 08-01-2013, 03:04 PM
Last Post: project girl
  Multilevel Inverters: A Survey of Topologies, Controls, and Applications pdf project girl 0 336 10-11-2012, 04:03 PM
Last Post: project girl
  NEGATIVE FEEDBACK AMPLIFIERS INSTRUMENTATION AMPLIFIERS seminar ideas 0 430 17-07-2012, 04:32 PM
Last Post: seminar ideas
  A LabView Based Instrumentation System for a Wind-Solar Hybrid Power Station seminar ideas 1 833 06-07-2012, 12:56 PM
Last Post: Guest
  DAQ - DATA ACQUISITION VIRTUAL INSTRUMENTATION seminar addict 0 757 28-01-2012, 04:02 PM
Last Post: seminar addict