05-12-2012, 04:52 PM
PLC based boiler pressure monitoring and controlling System
PLC based boiler pressure.docx (Size: 16.87 KB / Downloads: 66)
Aim:
This project is used to maintain the boiler pressure to avoid the harmful
condition in industrial area.
Description:-
Boilers use a heat source, usually combustion of a fossil fuel, to heat water to produce hot water or steam. Boilers fired with coal, wood and other solid fuels powered major industries in the 19th century. Boilers today burn natural gas and oil as well as solid fuels and continue to play a major role in manufacturing, heating and electricity generation.
Boilers are essential in many energy-intensive industries and comprise a significant component of U.S. energy consumption.
Boilers can be characterized by the configuration of the heat transfer surfaces – either fire tube or water tube - and by the fuel-burning system. The appropriate configuration is determined by the desired fuel, steam conditions and capacity.
Advantages of PLC:-
• Flexibility: One single Programmable Logic Controller can easily run many machines.
• Correcting Errors: In old days, with wired relay-type panels, any program alterations required time for rewiring of panels and devices. With PLC control any change in circuit design or sequence is as simple as retyping the logic. Correcting errors in PLC is extremely short and cost effective.
• Space Efficient: Today's Programmable Logic Control memory is getting bigger and bigger this means that we can generate more and more contacts, coils, timers, sequencers, counters and so on. We can have thousands of contact timers and counters in a single PLC. Imagine what it would be like to have so many things in one panel.
• Low Cost: Prices of Programmable Logic Controlers vary from few hundreds to few thousands. This is nothing compared to the prices of the contact and coils and timers that you would pay to match the same things. Add to that the installation cost, the shipping cost and so on.
• Testing: A Programmable Logic Control program can be tested and evaluated in a lab. The program can be tested, validated and corrected saving very valuable time.
• Visual observation: When running a PLC program a visual operation can be seen on the screen. Hence troubleshooting a circuit is really quick, easy and simple.