Indirect Hot Air Generator

1. IHAG systems replaces conventional, expensive fuel like LPG, LDO, FO, NG firing in baking, polymerizing, curing, drying, etc processes.

2. These systems can give fresh, clean, hot air to the process upto 450^• C .

3. The temperature accuracy of fully automated IHAG system is ±2^•C.

4. These systems can be operated on any of the low cost solid fuel available locally & system could be installed outside factory premises and clean hot air could be conveyed to the process.

THE INDRIECT (FBC) HOT AIR GENERATOR CONSISTS:

1. AIR SUPERHEATER (RADIACTIVE HEAT EXCHANGERS):

   • It consists of bank of S.S. pipes, welded with a free floating box header, which rest on rollers, supported on a mechanical structure frame.

2. AIR HEATER (CONVECTIVE HEAT EXCHANGERS):

   • It consists of bank of S.S./M.S. pipes, welded with a free floating box header, which rest on rollers, supported on a mechanical structure frame.

3. AIR PRE-HEATER (HEAT RECOVERY UNIT):

   • It recovers heat from the flue gases and transfers it to input fresh ambient air by counter current flow.

4. POLLUTION CONTROL EQUIPMENT:

   • High efficiency air pollution control equipment would be provided to reduce ash particles from flue gases emitted in the ambient through stack.

5. FLUDIZED BED COMBUSTION FURNACE:

   • Solid fuel fired FBC system consist a nozzle tube sheet with attached air plenum & a side structure frame. Graded CI (Cast Iron) nozzles are fitted on top of the nozzle plate.

   • Nozzle plate provided with sand drain pockets to remove heavy unwanted silica particle & clinkers from furnace.

6. FUEL FEEDING WITH SCREW CONVEYOR SYSTEM:

   • Motor driven screw conveyer will feel the fuel continuously into the furnace through designed fuel feeding venturi system aided by the S.F.D. Fan air.

7. BALANCED DRAFT SYSTEM:

   • The forced draft fan provides air for fluidization cum combustion through the air nozzles fitted on furnace plate. Induced draft fan is implemented for balanced suction in furnace.

8. HEAT INSULATION & REFRACTORY:

   • The HAG is insulated with mineral wool blanket packed with wire netting, cladding with aluminum sheet.

   • All the standard / special shaped refractory bricks for furnace walls along with fixtures & holders would be provided.

9. INSTRUMENTS & SAFETY INTERLOCKS:

   • The system offered is extremely user friendly. Alarms & safety interlocks have been provided to ensure different parameters of HAG.

   • In case of high hot air temperature audio/visual alarms are activated on panel.

   • In case of high & low condition of hot air duct pressure audio/visual alarms are activated on the panel.

   • Visual alarms are activated in case of fault in V/F controllers.

   • PID temperature controllers & pressure transmitters are provided for different required system parameters.

10. CONTROL PANEL:

    • The panel is PLC based having sophisticated but user friendly controls enabling the operator to run the HAG in automatic or manual made as desired.

11. AUXILLARIES:

    • Main MCCB ,V/F drives, annunciation module with hooter, PID controllers, indicating lamps.