Ladle Preheaters

Mobile Instant Ladle Preheaters

• Fully    Automatic Burner.  

• Power Supply -- Single Phase/ Three Phase

• Smokeless short flame.

• Uniform complete instant heating, upto 1000ºC.

• Self starting spark ignition.

• Very low cost of heating.

Universal  Ladle Preheater

• Insulated tilting ladle lid.

• Ladle of any size/shape, any position vertical/horizontal is heated.

• Lever controls for movement.

• Mobile.

• Automatic temperature controlling  and flame failure alarm.

Ladle Preheating Stations

• Large Ladle Preheating as per prescribed cycle.

• At a time Ball Ladle, Treatment Ladle, and Loop Ladles Preheating.

• Common Combustion Unit

• Independent Burners and Lids.

• Common Control Panel with Temperature Controllers.

• Ideal for small and big foundries.

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Mould Heaters

Online Mould Preheaters

• A unique innovation by Dhanaprakash.

• Suitable for continuous moulding line and moulds upto 1M × 1.2M size

• Instant penetrating  of hot air on an enclosed mould surface.

• Mould surface enclosed by insulated lid sliding up and down.

• Fuel - diesel / kerosene

• Supply - 230Volts 50Hzs  500Watts.

• Completely smokeless.

• Equipment is mobile mounted on wheels.

• Most economic, easy operation, confirmed results.

Portable Mould Preheaters

• Craned Mobile Mould Heaters.

• Insulated Hoods 1000mm X 1000mm and above.

• Automatic Hot Air Generator with Booster Blower.

• Control Panel and Oil Tank on Board.

• Single Phase, Three Phase Option Available.

• Instant Start and Stop.

• Mould Surfaces Blasted with Hot Air form Nozzles in an enclosed space.

• 250º C Temperature reached in 3 - 5 minutes.

• Application : Large Moulds Drying.

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Core Ovens

Direct Heating Batch Ovens

• Oven with hot air generator.

• Fuel-Diesel/Kerosene/LPG/NG

• Combustion complete and concealed.

• Replaces electrical ovens outright. Existing electrical ovens retrofitted to oil/gas.

• Applications- Foundry core ovens, powder coating ovens, powder coating, paint baking, burnout, drying etc.

Indirect Heating Batch Ovens

• Radiant Recuperative or Suction Burners Used.

• Indirect Mode of Heating.

• Fully automatic burners on light oil.

• Fast and quick heating.

• Overhead recirculation fan for uniformity.

Line Ovens

Certain processes require indirect heating due to constraints such as combustion product effect, uniformity etc.

Radiant tube burners are used in such cases, however recuperation is essential to minimize the loss through flue.

Dhanaprakash innovated a " Cost Effective Radiant Recuperative Burner."

• More than 85% efficiency.

• Flue gas temperatures as low as 200ºC.

• Single ended tube, u-tube, versions available.

• Furnace temperatures upto 950ºC obtained.

• Fuels used --- Reliance LDO, Diesel, Kerosene LPG, Natural Gas.

• Long lasting radiant tubes  --  SS310, 410, Kanthal APM.

• Fully automatic burner.

• Custom designed solutions case to case basis.

• Direct substitution for electrical heating (Retrofit).

• Saves substantial cost.

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Heat Treatment Furnaces

Oil/Gas Fired Auto-Cycle Controlled Bogie

Hearth Heat Treatment Furnace

Applications :

• Annealing

• Normalising

• Hardening

• Solution Treatment Heating

• Forge Heating

• Tempering 

• Aluminum Solutionising 

• Stress Relieving

• Ductile Iron Full Annealing.

Distinct Features :

Auto cycle control

• Ramp, Soak, Cool ..... 8 Steps Profile

• 20 Profile Memory

• Multi Input  Multi Output (MIMO)

• PID Controlling Action.

• Micro Processor Based Multi Point Temperature Recording System.

Firing

• High Velocity Short Flame Burner

• Direct On/Off  pulse firing effect.

• Smokeless perfect combustion

Uniformity

The furnaces are calibrated for uniformity as per API 6A Standard ( The Temperature Difference Between Highest & Lowest Points at Stabilised Conditions should not be more than 13ºC.)

Mechanization

• Trolley - movement by geared motor with brake.

• Door - movement by geared motor with brake, counter weighed,

• Door Unlocking - innovative motorised door unlocking system.

Construction:

• Strong rigid construction

• Heat resistant grade CI castings at door and frame, bogie and furnace interface eliminates warpage.

• Railway rails for load bearing under temperature.

• Double sealing minimising heat losses.

Insulation :

• High temperature high density ceramic fibre modular lining.

• Self supporting U-fold door lining.

Control Panel :

• Aesthetically powder coated control panel.

• Electrical switch gears for drives, burners.

• Status indication and control.

• Burner sequence controller and flame failure device.

• Programmable startup, burner, temperature controlling system.

Calibrations :

• Thermal survey as per API 6A Standard.

• All measuring instruments calibrated to national traceability.

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Salt Bath Furnace

• Fully Automatic Smokeless Burner.

• Ceramic Fibre Lining- Quick Heating.

• Better Pot Life.

• Accurate Temperature and Controlled by Burner on/off.

• Lined Vent or Recuperator Reduces Flue Gas Loss.

• Substantial Operating Cost Saving.

Applications

• Neutral Salt Bath Hardening.

• Carborising Salt Bath Hardening.

• Mar Quenching Operation.

• Aus Tempering Operation.

• Salt Bath With Heating And Cooling Available.

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Wire Annealing Furnaces

• Pot SS304/310.

• Ceramic Fiber Lining.

• High Velocity Short Flame Burner.

• Recuperated Vent.

• Uniform Heating.

• Lowest Cost Of Annealing.

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Sand Processing Equipments
 

Energy Efficient Sand Dryers & Coolers

• Rotary Sand Drier ( modified )

• Insulated with Minwool from outside

• Ends are fixed and also have insulation.

• Heat Losses Stopped.

• Sand uniformly dried.

• Fuel Saving.

Resin Sand Coaters

• Hot Air Generator for resin coated sand heating.

• High rated electrical heating is replaced by fuel based Hot Air Generator for controlled supply of hot air for baking of resin on sand.

• Completely smokeless & fully automatic.

• Batch time reduced.

• Fuel-Diesel/kerosene/LPG

• Cost Saving - 50% Direct Operating Cost saving.

• Dependency on Power Eliminated.

Sand Coolers

• Fluidised bed entrains the hot sand in compartments allowing intense contact with cooled pipes.

• Water circulating in copper pipes and entrainment slopes cools sand effectively.

• Low velocity removes dust.

• Average sand temperature Ambient + 10ºC Max.

• Strong and Robust Construction.

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Investments Castings Foundry
 

Shell Firing Furnace

• Ceramic Shell are fired to 1050º C an Furnace for burn out of wax and stabilisation of materials.

• Single chamber, two chamber, versions available.

• Smokeless heating systems.

• Easy shell charging and removal.

• Box type, Rotary Hearth etc types available.

Leach Out Furnace

• Intricate Castings have cleaning problem.

• Ceramic material removal is done in heated Caustic lye to dissolve ceramic.

• Quick and fast heating accelerators.

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Removable Former Heating System For Induction Furnaces

• Induction Furnace Lining Frequently done by using fabricated former which melts as scrap.

• The former is reused at least 20 times by programmed heatings.

• Former is heated after lining form inside upto moderate temperature slowly till entire moisture is removed.

• Firing stopped and former is suddenly cooled and pulled out for reuse.

• The heating by burner is continued till 1150º C in a programmed cycle.

• Huge savings, quick lining, Sintering without power.  

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Scrap Drying and Preheating System

• Induction melting needs clean scrap materials.

• The oils, moisture, etc impurities not only consume power but also affects the quality.

• Continuous changing mechanism can be fitted with High Velocity Firing System to preheat the scrap to 700 - 800º C.

• Scrap is also preheated in Ladle like Lined Containers by Oil/Gas Burners  upto 1100 º C and charged into Crucible.

• Energy saved, material quality improved.

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