Inside a fluidized bed, fuels mixed with inert solids such as ash or sand/Special media is combusted. Specific velocity air is passed into the bed, creating strong turbulence inside the bed and causing the solid particles to behave like a fluid and mix uniformly. Fluidized bed reactors are capable of combusting solid fuels at 95% efficiency or higher, generating heat/Gas at a high rate, which can in turn be used to produce steam.

SYSTEM ASPECTS
   The system comprises of fluidized bed furnace, nozzles, chambers for ash settling, ash removal mechanisms, cyclones, fuel feeding devices, hoppers, elevator, fluidization air blower, pneumatic fuel feeding blower, instrumentation & control equipments, operation panel board, motors & electrical components.

BIOMASS / SOLID FUEL DATA

1. Biomass / Solid Fuel Size                      :0 - 6 mm
2. Moisture content                                  : < 15 %
3. Ash content                                         : Up-to 30%

APPLICABLE FUELS:

1. Wood Wastes (Bar, Chips, Saw Dust etc.)
2. Agriculture wastes (Husks, Ground nut shell, Cotton Stack etc.,)
3. Lignite / Coal / Solid waste

This system is operated by auto control procedures. The fluidized media is incited slowly for fluidization by start up of fluidization air blower. The speed is regulated primarily & increased incrementally. Pneumatic fuel feeding is started & furnace is ignited. The fuel feeding is continued to achieve full combustion & required temperature. The control philosophy includes variables like air flow rate, feed rate, furnace pressure, combustion temperature etc. Ash is removed intermittently through settlers and cyclones.

The ( FBC ) Fluidised Bed Combustion fired HAG system consists of a fluidized bed furnace , settling chamber and high efficiency cyclones. Hot air with minor dust particals having size lower than 20 microns from our hot air generator, enters the process. The total system is automatic.

1. FBC Furnace With Wind Box :
Agro waste / Coal / Lignite fired FBC system comprising of a Nozzle plate with attached Air Plenum, a side structure frame bolted with Nozzle plate.Graded cast iron Nozzles fitted on top of the Nozzle plate and Sand drain pockets are provided for the removal of heavy unwanted silica particles.

2. Fuel Feeding With Screw Conveyor System:
M.S. Fabricated Fuel feeding venturi system is provided for feeding the fuel inside the furnace through S.F.D.Fan air.

3. Refractory Material :
All the standard / special shaped refractory bricks for furnace walls along with fixtures and holders are provided. The required Insulation bricks Mortar cements will be provided by us.( for Furnace area Refractory work only.)

4. Instrumentation And Safety Interlocks :
The system offered is extremely simple and convenient to operate. Alarms and safety interlocks have been provided to ensure correct working of the HAG. The following are a few of the safety inter locks.

• Unless process suction fan is switched on, F.D.Fan / S.F.D.Fan / Fuel Feeders will not operate.
• In case of high hot air temperature, audio/visual alarms are activated on the panel.
• In case of high bed temperature audio/visual alarms are actived on the panel and fuel feeder speed is lowered down to minimum.

5. Control Panel :
The panel is PLC based, having sophisticated but user friendly controls enabling the operator to run the HAG in automatic or manual mode as desired. The control panel consists of main MCCB, invertors for fans and feeders with individual MCBs, announciation module with hooter, PID controllers, indicating lamps and one auxiliary contact.