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  Atmospheric Fluidised Bed Combustion Boiler

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• In all Fluidised Bed Boilers, there is a hot bed containing bed material, ash & fuel.

• The Screened fuel of size less than 6mm is delivered into the bed

• Hot air from Air Heater is pushed through the bed by FD and PA fan.

• The combustion takes place predominantly in the bed and partly in free board of the combustor. Heat is transferred from the products of combustion (flue gas) to water, steam and air as they pass through the various heat transfer surfaces before exiting through the stack.

• Low combustion temperature and low excess air minimize the NOx generation

• The operational characteristics of AFBC ensure total fuel flexibility.


Design features of AFBC Boiler
  •   Hybrid, Bi-drum and Single drum configurations are offered

  •   Furnace is made out of gas tight membrane walls and are fabricated by automatic panel processing machine

  •   Bed coil is made out of seamless steel tubes with studs or without studs.

  •   In Bi-drum boiler, Baffleless bank tube eliminates refractory baffle in the bank and consequently no maintenance problem on this account.

  •   As there is no turning in the gas path, bank tube erosion is also avoided.

  •   Specialised design of fuel nozzle ensures good combustion and eliminates clinker formation.

  •   The wetted parts of mixing nozzles are made of Nihard Cast iron, which protects the mixing nozzles from erosion

  •   Cassette Baffle is provided for economiser bends, so that gas will not pass through bends which in turn protect economiser bends from erosion

  •   Surge hopper is provided above fuel feeders to avoid direct load bunker fuel coming on to the feeders which in turn facilitate free fuel flow through the feeders

  •   There are no bends in fuel transport piping, thus avoiding erosion

  •   Vertical travel of fuel from cross to fuel nozzle is minimal

Advantages of AFBC Boiler
  •   Ability to burn low grade fuels and multi fuel capability

  •   Higher thermal efficiency compared to conventional type boilers. Lesser auxiliary power consumption

  •   Operational Flexibility on load variation

  •   Low excess air

  •   Compact boiler

  •   Easier startup and quicker rated capacity

  •   Better Turndown ratios

  •   Low SO2 emission and ability to burn high sulphur Coal

  •   Low NOx emission

AFBC Technology offers Fuel Flexibility


Coal

  •   Indian coal

  •   Imported coal

  •   Meghalaya coal

Waste coal

  •   Washery Rejects

  •   Char

  •   Dolochar

Gas

  •   Biogas

  •   Natural Gas.


Agricultural Waste

  •   Rice husk

  •   De-oiled Rice Bran [DOB]

  •   Ground Nut Shell

  •   Saw dust

  •   Coffee husk

  •   Bagasse pith

  •   Coconut shell

  •   Woodchips

  •   Julia flora

  •   Cotton stalk

  •   Bamboo dust

  •   Castor De-oiled cake


Lignite

  •   Kutch lignite

  •   Neyveli lignite

  •   Raw lignite

  •   Barmer lignite

  •   Nagor lignite

  •   Bhavnagar lignite

Petroleum Coke

  •   Petcoke

  AFBC - Types

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AFBC - Shell Type Memberane Furnace

 CAPACITY :   4.0 TPH TO 30.0 TPH
 STEAM OUTLET PRESSURE :   10.5,14.5 ,17.5 Kg/Cm²(g)
 STEAM OUTLET TEMPERATURE :   SATURATION TEMPERATURE
 FUELS USED :   HUSK, DOB, SAWDUST,COAL,GROUND NUT SHELL etc
 APPLICATON :   PROCESS INDUSTRIES
 NUMBER OF BOILERS COMMISSIONED IN THIS RANGE OUT OF OUR TECHNOLOGY TEAM :   320



AFBC - Saturated Steam - (With Economiser)

 CAPACITY     :   10 .0 TPH T0 30.0 TPH
 STEAM OUTLET PRESSURE     :   10.5 TO 22 Kg/Cm²(g)
 STEAM OUTLET TEMPERATURE     :   SATURATION TEMPERATURE
 FUEL USED     :   RICE HUSK,DOB,SAW DUST,GROUND NUT SHELL, COAL, KUTCH LIGNITE etc.
 APPLICATON     :   PROCESS INDUSTRIES, CO-GEN POWER PLANT.
 NUMBER OF BOILERS COMMISSIONED IN THIS RANGE OUT OF OUR TECHNOLOGY TEAM     :   215



AFBC - Bi Drum (Super Heated Steam)

 CAPACITY :   10.0 TPH TO 90.0 TPH
 STEAM OUTLET PRESSURE :   21 TO 67 Kg/Cm²
 STEAM OUTLET TEMPERATURE :   220 TO 485° C
 FUEL USED :   HUSK,COAL,KUTCH LIGNITE,CHAR COAL,PETCOKE etc.
 APPLICATON :   PROCESS INDUSTRIES,CO-GEN&CAPTIVE POWER PLANT
 NUMBER OF BOILERS COMMISSIONED IN THIS RANGE OUT OF OUR TECHNOLOGY TEAM :   262


AFBC - Single Drum (Super Heated Steam)

 CAPACITY :   25.0 TPH TO 175.0 TPH
 STEAM OUTLET PRESSURE :   33.0 TO 105 Kg/Cm²
 STEAM OUTLET TEMPERATURE :   485 TO 525° C
 FUEL USED :   COAL, RICE HUSK, BAGASSE,KUTCH LIGNITE etc
 APPLICATON :   CO-GEN POWER PLANT
 NUMBER OF BOILERS COMMISSIONED IN THIS RANGE OUT OF OUR TECHNOLOGY TEAM :   070



AFBC – Highest Capacity

 CAPACITY     :   200 TPH
 STEAM OUTLET PRESSURE     :   105 Kg/Cm²
 STEAM OUTLET TEMPERATURE     :   525° C
 FUEL USED     :   COAL
 APPLICATON     :   CAPTIVE POWER PLANT
 NUMBER OF BOILERS COMMISSIONED IN THIS RANGE OUT OF OUR TECHNOLOGY TEAM     :   001



Natural Gas,Bio-Gas Fired In AFBC

 CAPACITY :   4.0 TO 50.0 TPH
 STEAM OUTLET PRESSURE :   8 TO 80 Kg/Cm²
 STEAM OUTLET TEMPERATURE :   UPTO 485° C
 FUEL USED :   COAL, HUSK, BIO GAS
 APPLICATON :   PROCESS INDUSTRIES, CO-GEN POWER PLANT
 NUMBER OF BOILERS COMMISSIONED IN THIS RANGE OUT OF OUR TECHNOLOGY TEAM :   020