CONVERSION OF Electrical Paint Drying / Powder Coating Oven to LPG System  
 
     
       
  A. Reason for Conversion :  
       
      The electrical loading was 72 KW Production loss due to longer preheating time and cost of power consumed, were reasons for the company to look for the alternative fuel ( LPG ).  
       
  B. What did we do :  
       
      Since direct firing of LPG does not in any way effect the products, a separate combustion chamber was mounted at one side of Oven at top position. The Heaters from both the sides were removed. an automatic monoblock burner was kept at the mouth of the chamber. Special baffle plates were fixed to guide the hot air from the combustion chamber to the air chamber for the proper distribution of hot air. The auto control system was interlocked with the circulation motors, so that burner cannot be switched on unless - the fans come into operation.  
         
  C. Results :  
      (i) Customer is pleased with the reduction in energy costs, uniformity of temperature and increase in production.  
      (ii) Since the electrical heating is not disturbed, the system can be operated either on electricity or LPG firing.  
       
       
COMPARISION BETWEEN Electrical Heating and LPG fired system : Core Drying Oven  
       
 
 
S.NO PARTICULARS ELECTRICITY LPG
         1.                  Initial Heating Time                         1 Hr. - 15 mtes.                     1 Hr.
         2.                  Combustion of Fuel                         70 Units. / Hr.                     7.5 Kg./ Hr.
         3.                  Rate of Fuel                         Rs. 3.50 / Unit.                     Rs. 25.00 / Kg.
         4.                  Cost of Fuel                         Rs. 245.00 / Hr.                     Rs. 187.50 / Hr.