bed coil afbc boiler leakage reason
HOT
Capacity:1-20t/h
Rated thermal efficiency: 100-104%
Fixed working pressure: ≤1.6MPa
Applicable fuel:natural gas etc.
HOT
Capacity:0.7-14MW
Rated thermal efficiency:96-98%
Fixed working pressure:≤1.25MPa
Applicable fuel:Natural gas, light oil, etc.
HOT
Capacity:0.7-2.8Mw
Rated thermal efficiency: 97.2-106%
Fixed working pressure:0.1MPa
Applicable fuel:Natural gas, etc.
HOT
Capacity:2.8-7.0Mw
Rated thermal efficiency:≥105.5%
Fixed working pressure:-0.02MPa
Applicable fuel:Natural gas, etc.
HOT
Capacity:99Kw
Rated thermal efficiency:97.2-104.4%
Fixed working pressure:1.0MPa
Applicable fuel:Natural gas, etc.
HOT
Capacity:0.5-4.0 t/h
Rated thermal efficiency:98%
Fixed working pressure:≤1.25MPa
Applicable fuel:electric energy
At present the Project for the installation of 2x3 MW TG with 2 Nos. AFBC Boiler. capacity SlIper-heater coil leakage Too much-Nil Scaling inTurbine ,duetowhich super-Yes, PRDS heated steam temp- 525°C Super heater coil Yes Removed Againputincircuitwith modification Mix Bed--New M.B.installed for better quality of DM water Si0 2 & P0 4 Get Price
Sep 14, 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.Get Price
Sep 14, 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.Get Price
Failure Analysis of Bed Coil Tube in an Atmospheric Fluidized Bed … 2013/11/13 · The bed coil tube of AFBC boiler operated for about 1,000 h has the dimensions of 51.0 mm OD and 7.0 mm thickness. The fuel used in the boiler is coal of size 6 mm. In the AFBC system, the water from the boiler drum is made to run through six down comers.Get Price
In an FBC boiler with low ash fusion coal, if the bed temperature exceeds 950°C, the result is: a) Low steam temperature b) clinker formation c) Melting of lime stones d) Ash carry over 47. Electrical energy consumption for coal sizing will be maximum for …Get Price
Dec 21, 2017 · In Atmospheric Fluidized Bed Combustion Boiler (AFBC), crushed coal of size 1–10 mm is supplied to the fluidization media. As the temperature of furnace becomes equal to the ignition temperature of the coal it starts burning. Coal supply is also controlled so that the temperature of the fluidized bed can be kept between 750 and 850 °C.Get Price
The leakage developed through a pin hole in the groove portion where the material is continuously removed by the caustic action. A recall of the past CORROSION FAILURE DUE TO CAUSTIC TOP OF TUBE IDLE COMPARTMENT Caustic gouging is related to loss of metal by caustic concentration mechanisms or by gross deviation in water chemistry.Get Price
Aug 28, 2014 · if id trip it is nssry that all equipment should be trip like pa & fd coz if they didnt trip they may be reason of furnace blasting..just because of air pressure inside the furnace which will increse by pa & fd & if this pressuse didnt release than it is the reason of furnace blasting so this is important interlock of boiler.Get Price
agricultural wastes. The fluidized bed boilers have a wide capacity range- 0.5 T/hr to over 100 T/hr Atmospheric Fluidized Bed Combustion (AFBC) Boiler : Most operational boiler of this type is of the Atmospheric Fluidized Bed Combustion. (AFBC). This involves little more than adding a fluidized bed combustor to a conventional shell boiler.Get Price
The reason for the inner coil to fail is the heat flux and its outlet arrangement. The outer tube gets little more heat. The inner coil length is 1516 mm and the outer coil length is 2162 mm. The steam generation in the outer coil is more. This can obstruct the flow rate in the inner coil due to arrangement of stubs in the bed coil outlet header.Get Price
Sep 14, 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.Get Price
Failure Analysis of Bed Coil Tube in an Atmospheric Fluidized Bed … 2013/11/13 · The bed coil tube of AFBC boiler operated for about 1,000 h has the dimensions of 51.0 mm OD and 7.0 mm thickness. The fuel used in the boiler is coal of size 6 mm. In the AFBC system, the water from the boiler drum is made to run through six down comers.Get Price
Dec 16, 2010 · Art of Bed Management in AFBC Boilers. 27. Thermal Expansion of Boiler. 28. Visit to Penthouse. 29. Troubleshooting water carry over in …Get Price
Dec 11, 2015 · PRIMARY AIR PRESSURE P.A. fan air header pressure for AFBC boiler is to be maintained 1000 to 1150 mmwc. Difference of primary air pressure & F.D. wind box pressure is to be maintained approximately 500 mmwc. NOTE: High P.A. pressure increases the bed coil erosion and carryover to enhance secondary combustion. 6.Get Price
Jul 17, 2017 · After the water is converted into steam in the boiler it passes through the superheater coil, more tubes are exposed to the flue gases to increase the temperature of steam. secondary seal will protect the leakage.The secondary seal is used only for additional protection AFBC and Fire tube boilersGet Price
AFBC ( Atmospheric Fluidized Bed Combustion ) BOILER COLD START …Get Price
Thermal fatigue failure in a FBC boiler. Aug 09, 2019· Thermal fatigue failure in a FBC boiler 1. THERMAL FATIGUE FAILURE IN BED EVAPORATOR TUBE OF AN AFBC BOILER By K.K.Parthiban, B. Tech(IIT-Madras), M.E Thermal Engineering- RECT Trichy This paper is about a repetitive evaporator tube failure experienced in …Get Price
In an FBC boiler with low ash fusion coal, if the bed temperature exceeds 950°C, the result is: a) Low steam temperature b) clinker formation stoker fired boiler b) AFBC boiler c) CFBC boiler d) pulverised coal boiler . Paper 2 6 41. Run Around Coil type 44. Corrosion in stack, Air Pre-Heater, Economizer is mainly influenced by _____ Get Price
Almost, all Atmospheric Bubbling FluidIsed Bed Combustion Boilers (AFBC) use the bed evaporator (Bed coil) tubes as the mode of extracting heat from the bed to maintain the bed temperature. The Boiler components are categorised mentioned below. 1.0 BOILER PRESSURE PARTS The complete system of boiler pressure parts covers - Steam drum / Mud drum.Get Price
Boiler House –New screw Air compressors in place of reciprocating Air compressors 1.17 26.0 - Primary ETP Washer drives 1 & 2 – Replacement of Dyno drives with VFD 0.163 3.629 - Boiler –11 TA Fan –Replacement of DOL starter with VFD 0.432 9.6 - PRDS –1 leak off steam diverted for RO water heating 3.256 - 486 Project with minimum Get Price
Boiler efficiency is a measure of the goodness of the chosen process and equipment to transfer combustion heat to the heat in steam. Boiler efficiency can be defined as the ratio of the useful heat output to the total energy input. (3.1) η = Q abs Q in. where. η is boiler efficiency.Get Price
Fig. 1: Corrosion of Bed Coil of Boiler Introduction atmospheric fluidized bed combustion (afbc) boiler Atmospheric fluidized-bed combustion (AFBC) boilers offer efficient, cost effective and reliable steam generation. AFBC technology promises to provide a viable alternative to conventional coal-fired and other solid fuel-fired boilers.Get Price
Feb 27, 2012 · The boiler in which fluidisation and combustion is done in the bed with the help of (pa,sa&ta)air and ash(un burnt particle) is re-used through …Get Price
About the boiler The fluidized bed boiler parameters are 50 TPH, 66 kg/cm2 g, 490 deg C and feed water temperature is 140 deg C. The boiler is of single drum design with bed SH, radiant SH, convection SH, economiser, air preheater and ESP. The boiler is supposed to have been designed for many load combinations as below.Get Price
Jan 19, 2021 · 10-Main steam line hammering. Steam line hammering is the phenomenon when steam & water mix at high pressure. Water hammer is a pressure surge or wave caused when a fluid (usually a liquid but sometimes also a gas) in motion is forced to stop or change direction suddenly (momentum change).Get Price
Oct 12, 2013 · The major reason is caustic gouging in bed tubes of these high pressure AFBC Boilers. Corroision in the boiler is prevented by maintaining the boiler water condition in such a way that the magnetic layer is maintained.Boiler water has to be at Ph 9 to 10.2 in order to preserve the magnetic layer of steel.Get Price
4.8 Bed coil immersion area Fluidised bed without bed coil makes the start up easier. This is due to the fact that during start up, the heat released by the charcoal partly goes to bed coils. Depending on the fuel to be fired the bed coil area is provided. In agro waste fired boiler the bed coil required would be less as compared to coal firing.Get Price
Failure Analysis of Bed Coil Tube in an Atmospheric Fluidized Bed … 2013/11/13 · The bed coil tube of AFBC boiler operated for about 1,000 h has the dimensions of 51.0 mm OD and 7.0 mm thickness. The fuel used in the boiler is coal of size 6 mm. In the AFBC system, the water from the boiler drum is made to run through six down comers.Get Price
Up to10%cash back · Nov 13, 2013 · To summarize, the bed coil tube of AFBC boiler had failed due to internal corrosion specifically by caustic gouging nature due to the presence of sodium compounds in the internal deposits and material wastage from internal surface.Get Price
Atmospheric Fluidised Bed (AFBC) Boilers These boilers are efficient, flexible with regards to fuels, easy to operate and maintain, and involve low initial and maintenance costs. They comprise of membrane panels, studded inbed coils, watertube shell …Get Price
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