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why bed coil failure in afbc

AFBC Boiler Bed Coils Frequent Failure CR4 Discussion

12/10/2013· We are facing bed coil failure frequently. Boiler capacity 105 ata/510 degree C., Steam loading upto 90 t/hr. Bed height 600 mmwc. Bed temperature 900 to 950 degree C. FD air flow 110t/hr. What would be the possible reasons for this bed coil failure. Please reply. Thanking you,

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Failure Analysis of Bed Coil Tube in an Atmospheric

13/11/2013· The Atmospheric Fluidized Bed Combustion Boilers have advantages as compared to conventional coal fired boilers in respect of heat transfer, SOx, NOx, emissions and efficiency. In the present study, the failure analysis of bed coil tube, used in atmospheric fluidized bed combustor was studied. The failure studies included physical, chemical and metallurgical analysis and the results analyzed reveal that the failure is typically due to caustic gouging. The cause of failure

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major cause for the failure of fbc bed coils

Aug 13, 2015 In my experience, one of the most common causes of trip coil failure is that the breaker mechanism lubrication has thickened or been worn away to the point that the mech sticks In that case, the the trip coil solenoid is unable to cause the latch to release the springs (or other energy storage) to cause the breaker to trip. Get Price

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A Review Paper on Erosion and Corrosion Behavior of Coal

1800 coating was sprayed on the super heater coils of an AFBC power plant. Fig. 3: Alpha 1800 Spraying of Superheater Coil For An AFBC Power Plant Fig. 4: Failure of In-Bed Evaporator Tube Vikas Chawlaa, Amita Chawlab, D. Puric, S. Prakashc, Prema G.

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25-Questions & Answers on AFBC Boilers

Coils are generally fitted in 2 nos inner & outer. To prevent erosion due to fluidizing materials, coils are covered with refractory materials. IBSH: In bed Super heater coils. One SH coil is placed inside the bed, it is just placed right angle of IB coil & generally installed from

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AFBC ( Atmospheric Fluidized Bed Combustion ) BOILER

02/09/2017· In afbc boiler fluidization bed combustion is method of burning of solids fuel in which the fuel is continuous fed into hot fluidized bed of inert bed material. Inert fluidized bed is heated to the ignition temperature of fuel and fuel is supplied continuously into the bed. The fuel burn rapidly and the bed attain a uniform temperature. In afbc boiler combustion is take place at about 850- 950

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Boiler trouble shooting guide- K.K.Parthiban by K Issuu

16/12/2010· A pin hole failure was reported in the 12 o clock position of the bed coil tube. On cutting the tubes, the inside was found have gouging mark for the throughout the inclined portion of the tube

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THERMAL FATIGUE FAILURE IN BED EVAPORATOR TUBE

The bed The bed inventory should be more or less constant, like boiler drum level. This is the key to stability of the combustion in AFBC / CFBC boilers. Flue gas does not transfer heat directly to bed coil. It is the bed material that transfers the heat to the bed coil. Less bed height causes erratic combustion. CONCLUSIONThe erratic coal

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bed coils life in afbc boilers Grinding Mill China

CR4 Thread: AFBC Boiler Bed Coils Frequent Failure Subscribe to Discussion: CR4 allows you to "subscribe" to a Gulin Least News. Optimizing manganese ore sinter plants: process parameters and design implications » The More » wet recovery system for stainless steel » white silica sand for sale in durban » slate and stone floor installers greater boston area » salt processing

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Bed Tube Failure Diagnosis- Final Report by Venus 19

19/12/2013· A pin hole failure was reported in the 12 o clock position of the bed coil tube. On cutting the tubes, the inside was found have gouging mark for the throughout the inclined portion of the tube. Several adjacent tubes are inspected with D meter. Four adjacent tubes showed less thickness at 12o-clock position. The tubes were cut inspected and these tubes were also found to have the same marks

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AFBC ( Atmospheric Fluidized Bed Combustion )

02/09/2017· In afbc boiler fluidization bed combustion is method of burning of solids fuel in which the fuel is continuous fed into hot fluidized bed of inert bed material. Inert fluidized bed is heated to the ignition temperature of fuel and fuel is supplied continuously into the bed. The fuel burn rapidly and the bed attain a uniform temperature. In afbc boiler combustion is take place at about 850- 950

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THERMAL DESIGN ENGINEER: For Over bed FBC boiler...

(1) Lab analysis of Coal property-whether it is suitable for AFBC combustion or not. (2) Dis-advantages of over bed system in a AFBC boiler. (1) Lab analysis of Coal property-whether it is suitable for AFBC combustion or not:

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Boiler Operation SlideShare

14/09/2016· • Expand bed height for AFBC boiler is to be maintained 500 to 600 mmwc. • FD air discharge pressure is to be maintained 600 to 650mmwc • Wind box or air box pressure is to be maintained 500 to 600mmwc High W.B. pressure increases the erosion of bed coils & low WBP affect fluidization. 4. 4 2. PRIMARY AIR PRESSURE P.A. fan air header

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Boiler Tube Failures

such failure results in overheating or overstressing the tube material beyond its capabilities for either a short-term or a long-term period. Temperature Pressure Operating Point Free Capacity for Creep Scheduled Plant Life . Creep failures-Overheating 9/4/2013 Steag O&M Company 14 Short-term Overheat Failure results in a ductile rupture of the tube metal, “ ” fracture surface is a thin

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Boiler trouble shooting guide- K.K.Parthiban by K

16/12/2010· A pin hole failure was reported in the 12 o clock position of the bed coil tube. On cutting the tubes, the inside was found have gouging mark for the throughout the inclined portion of the tube

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Safe Operation and Explosions in Boilers

11/12/2015· BED HEIGHT/FD AIR PRESSURE Static height for AFBC Boiler is to be maintained 300 to 325 mm during initial light up of boiler. Expand bed height for AFBC boiler is to be maintained 500 mmwc to 600 mmwc. FD Air discharge Pressure 600 to 650 mmwc. Wind box or Air Box pressure 500 to 600 mmwc. NOTE: High W.B. pressure increases the erosion of bed coils & low W.B. stops fluidization.

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Basic Questions & Answers on Slop/Spent wash fired Boilers

14/08/2020· Reasons for boiler tubes failure: Failure due to overheating Failure due to internal scales Failure due to aging Failure due to uneven expansion Failure due to ash and flue gas erosion Failure due to material defects Failure due to internal and external tube corrosion Improper or effected circulation due to opening/passing of low point drains 3.List down the sequential action taken after

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