Acoustic Instruments may be used to detect early boiler tube leak to avoid secondary damage to pressure parts.Boiler acoustic tube leak detection system must be used as it prevent damage to costly boiler parts and it is very much cost effective.An increase in boiler availability of just one day will more than cover the cost of a leak detection system.
Traditional leak detection system such hearing hissing sound by ear or monitoring feed water flow or furnace vaccum is not much reliable because it can not detect small leak so damage to vital costly equipment of boiler may not be avoided.Writer noticed many instances where thermal power plants boiler allowed to run for long time due to confusion which caused permanent damage to many boiler tubes,refractory and boiler structures.Hence importance of acoustic monitoring leak detection systems sincerely felt .
Acoustic leak detection sensors detect high frequency emmissions from site of leak and Sensitive piezoelectric sensors mounted to the structure transform these acoustic waves to electronic voltage signals, which are amplified, filtered, and processed to determine energy content.
Early detection by acoustic monitoring instruments results in substantial reduction of repair times and costs with a consequent increase in plant availability and profits. The early detection of a bolier tube leak will give financial savings which will easily exceed the initial capital cost of the detection system even at the very first event.
Finally,Acoustic monitoring instruments must be intalled in boilers of thermal power plants.for more details go to
http://www.acousticmonitoring.com/
Acousti monitoring international
p(330)305-1422f(330)494-9822-16707 harbour drive n.w cantou ohio 447
http://www.proconeng.com/mainfiles/boilerleak.html
procon engineering
http://www.triple5industries.com/
http://www.steamleak.com/
know more about boiler tube leakage,avoid clinker formation and furnace explosion
http://boilerdetails.blogspot.com/
Thermal Power Plant
Boiler Turbine EP,ABT
Saturday, July 31, 2010
Tuesday, July 13, 2010
Introduction and some facts about large thermal power station for efficient operation.
Introduction and some facts about large thermal power station for efficient operation.
Boiler is used for steam generation.
Ball Mill or Bowl mills are used for pulverisation of coal in powder form for efficient firing in boiler.
Raw Coal Feeders are used to supply coal to ball mills in controlled quantity.
PA Fan are used to transport and preheat pulverised coal to burners.
ID Fan are used to exhaust flue gases to chimeny and create vaccum in Furnace.
Electrostatic Precipitators are used to separate ash particles from flue gases to control pollution.Here collecting electrode,emmiting electrode and rapping mechanism used.
FD Fan used to provide air to boiler for help in firing.
Steam produced in boiler is further superheated in Superheaters.There are lot superheaters such as platen,pendent,convection and final superheaters.
Boiler drum used for separation of staem from water and storage.Nowadays Drum less once through boiler also used which operates at super critical temerature and Pressure.
Boiler circulation pump used for forced circulation of water in water wall because at high pressure natural circulation is not possible.
Soot Blowers used to remove soot from water wall,Superheater,Reheaters and Air Heaters by injecting steam into heating surfaces.
Ash slurry pumps are used to flush ash with water.
Boiler Feed Pump used to provide water to boiler Drum.
Deaerator used to separate dissolved air from Feed water.
In Turbine heat energy of steam is converted into mechanical energy.
ESV which is called emergency stop valve used to stop supply of steam to turbine when unit trips.
Reheaters used to reheat steam exhausted from HP turbine.After reheating upto 535 degree centrigade same steam is utilised in Intermediate Pressure Turbine.
Barring gear or shaft turning gear is used to ratate turbinr rotor at 3.15 rpm when turbine is not running to check bending of rotor due to its own weight.
LP Heaters and HP Heaters are used to heat condensate and feed water supplied to boiler to increase efficiency by steam bled from turbine extraction.
Economiser are used to heat feed water by flue gages to increase efficiency. Heat of waste flue gas is utilised here.
Air Heaters uses heat of waste flue gases to preheat primary and secondary air.There are two types of air heaters tubular and rotary.
Condenser used to condence steam exhausted from turbine.
Condensate Pump are used to supply water to Deaerator from condenser Hot well.
CW Pump used to cool steam exhausted from turbine into condensers.
Raw Water is Circulated by cw pump into condenser tube hence leakage from condenser tubes must be checked to avoid mixing of raw water into Hot well.
Turbogenerator converts mechanical energy into electrical energy.
H2 Gas used in generators used for cooling of generators.
Seal Oil system used to seal hydrogen gas from escape from generator.
Stator Water Cooling system provides demineralised water into hollow stator conductor of generator for its cooling.
Generating Tansformer steps up volatage for transmission.
Water Treatment Plant is used to produce demineralised water for steam generation. Cation anion and degassifier tower used to separate mineral and gases from water.PAC or alum used to separate mud and silica from water.Here minerals removed from water and ph value is maintained near 7 and silica value must less tham 0.02 ppm
Coal Handling Plant supplies Coal to Boiler.Merry go round system or wagon trippler used to unload coal into hoppers. Coal is crused in crusher to crush it in 25mm size.Magnetic separators used to separate metalic particles from coal.
ABCB,SF6,OCB,MOCB and VCB are circuit breakers used to make or break electricity contact at load.
Isolators are used to make or break contact at no loads.
ABT is availability based tarrif system to maintain grid discipline.
Purging is done to clean furnace from combustible gases by running ID Fan and FD Fan at atleast 30% load for 5 minutes to avoid furnace explosion.
Furnace explosion may be checked by timely purging and adjusting firing properly using right quantity primary and secondary air and timely oil support and avoiding leakage of fuel oil in boiler.Furnace must be purged properly again if flame is not established during lightup of boiler.
Flame scanners used to sense flame in boiler to detect flame failure to avoid boiler furnace explosion.
FSSS is furnace safeguards supervisory system to safeguard boiler.
Clinker formation which caused by more ash content having low fusion temperature and mineral in poor quality coal may be checked by proper poking and using more water for flushing and use of clinker grinder and regular soot blowing.Overfiring which is also cause of clinker formation may be avoided by proper primary and secondary air ratio.
Acoustic Instruments used to detect early boiler tube leakage to avoid secondary damage to pressure parts,Refractory and structures of Boiler.Boiler must be immediately shut down in case of Boiler tube Leakage.
http://tpp-4u.blogspot.com/
Boiler is used for steam generation.
Ball Mill or Bowl mills are used for pulverisation of coal in powder form for efficient firing in boiler.
Raw Coal Feeders are used to supply coal to ball mills in controlled quantity.
PA Fan are used to transport and preheat pulverised coal to burners.
ID Fan are used to exhaust flue gases to chimeny and create vaccum in Furnace.
Electrostatic Precipitators are used to separate ash particles from flue gases to control pollution.Here collecting electrode,emmiting electrode and rapping mechanism used.
FD Fan used to provide air to boiler for help in firing.
Steam produced in boiler is further superheated in Superheaters.There are lot superheaters such as platen,pendent,convection and final superheaters.
Boiler drum used for separation of staem from water and storage.Nowadays Drum less once through boiler also used which operates at super critical temerature and Pressure.
Boiler circulation pump used for forced circulation of water in water wall because at high pressure natural circulation is not possible.
Soot Blowers used to remove soot from water wall,Superheater,Reheaters and Air Heaters by injecting steam into heating surfaces.
Ash slurry pumps are used to flush ash with water.
Boiler Feed Pump used to provide water to boiler Drum.
Deaerator used to separate dissolved air from Feed water.
In Turbine heat energy of steam is converted into mechanical energy.
ESV which is called emergency stop valve used to stop supply of steam to turbine when unit trips.
Reheaters used to reheat steam exhausted from HP turbine.After reheating upto 535 degree centrigade same steam is utilised in Intermediate Pressure Turbine.
Barring gear or shaft turning gear is used to ratate turbinr rotor at 3.15 rpm when turbine is not running to check bending of rotor due to its own weight.
LP Heaters and HP Heaters are used to heat condensate and feed water supplied to boiler to increase efficiency by steam bled from turbine extraction.
Economiser are used to heat feed water by flue gages to increase efficiency. Heat of waste flue gas is utilised here.
Air Heaters uses heat of waste flue gases to preheat primary and secondary air.There are two types of air heaters tubular and rotary.
Condenser used to condence steam exhausted from turbine.
Condensate Pump are used to supply water to Deaerator from condenser Hot well.
CW Pump used to cool steam exhausted from turbine into condensers.
Raw Water is Circulated by cw pump into condenser tube hence leakage from condenser tubes must be checked to avoid mixing of raw water into Hot well.
Turbogenerator converts mechanical energy into electrical energy.
H2 Gas used in generators used for cooling of generators.
Seal Oil system used to seal hydrogen gas from escape from generator.
Stator Water Cooling system provides demineralised water into hollow stator conductor of generator for its cooling.
Generating Tansformer steps up volatage for transmission.
Water Treatment Plant is used to produce demineralised water for steam generation. Cation anion and degassifier tower used to separate mineral and gases from water.PAC or alum used to separate mud and silica from water.Here minerals removed from water and ph value is maintained near 7 and silica value must less tham 0.02 ppm
Coal Handling Plant supplies Coal to Boiler.Merry go round system or wagon trippler used to unload coal into hoppers. Coal is crused in crusher to crush it in 25mm size.Magnetic separators used to separate metalic particles from coal.
ABCB,SF6,OCB,MOCB and VCB are circuit breakers used to make or break electricity contact at load.
Isolators are used to make or break contact at no loads.
ABT is availability based tarrif system to maintain grid discipline.
Purging is done to clean furnace from combustible gases by running ID Fan and FD Fan at atleast 30% load for 5 minutes to avoid furnace explosion.
Furnace explosion may be checked by timely purging and adjusting firing properly using right quantity primary and secondary air and timely oil support and avoiding leakage of fuel oil in boiler.Furnace must be purged properly again if flame is not established during lightup of boiler.
Flame scanners used to sense flame in boiler to detect flame failure to avoid boiler furnace explosion.
FSSS is furnace safeguards supervisory system to safeguard boiler.
Clinker formation which caused by more ash content having low fusion temperature and mineral in poor quality coal may be checked by proper poking and using more water for flushing and use of clinker grinder and regular soot blowing.Overfiring which is also cause of clinker formation may be avoided by proper primary and secondary air ratio.
Acoustic Instruments used to detect early boiler tube leakage to avoid secondary damage to pressure parts,Refractory and structures of Boiler.Boiler must be immediately shut down in case of Boiler tube Leakage.
http://tpp-4u.blogspot.com/
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