AIR COOLED OIL GUN

Air cooled oil guns are for developed to replace the high maintenance cost and cumbersome oil gun retract mechanism.

PRINCIPLE

The air cooled oil gun is cooled by low pressure stream of air passing through a specially designed gun cap with finned surface. The low pressure air passing around the atomizer shields and reduce the furnace radiation falling on the atomizer parts by extracting heat through the finned surfaces.

PRODUCT INTRODUCTION:

Air cooling of critical atomizer parts is more efficient than retract of oil guns in the wind box

An oil gun located in high radiant temperature zone makes their atomizers continuously exposed to overheating and gets damaged.

To prevent this condition and protect the oil gun, pneumatic retraction of oil gun is the method. But it presents its own operation and maintenance difficulties

To avoid the retract mechanism CCE & CE offers Air-cooled Design where the oil guns remain inserted in the firing position when not in use without damage to any of its components.

CCE & CE Oil gun eliminates the complicated retract mechanism, their maintenance problems and also provides improved accessibility to the burner front.

CCE & CE Oil gun is the best alternative to retractable oil guns and meets the required safety and code requirements

Cooling air requirement

Standard Capacity Guns 2 – 2.5 sm3/min of ambient air at 50 – 60mm wc above furnace pressure

High Capacity Guns 4 – 4.5 sm3/min of ambient air at 80 – 100 mm wc. above furnace pressure

The purpose of the air cooled oil guns is to eliminate the more expensive and cumbersome retract mechanism prone to increased maintenance with retract air cylinders, solenoid valves, limit switches and electrical connections

WHY AIR COOLED OIL GUNS

To prevent the oil gun tips getting over heated when oil guns are not in use, they are automatically withdrawn to relatively cooler place inside the wind box by retract mechanism. Pneumatically operated retract mechanisms comprising of solenoid valves, limit switches, air cylinders etc are presently used to retract oil guns from normal firing position when the oil guns are not in service.

Reliability of operation of the retract mechanism at higher ambient temperature and dust conditions very close to the burner zone require special care and high maintenance. Due to various reasons frequent failure of the oil gun retract mechanisms have been observed.

As a result, the oil guns are left in firing position even when not in operation. Constant exposure to heat can cause rapid heating of the tip and followed by rapid cooling by the fuel oil and steam while taking into service can cause thermal shock and undue stress and hence, cracking of tips.

AIR COOLED OIL GUNS

Retraction of oil guns from normal firing positions can be eliminated by cooling of critical parts of atomiser continuously when the gun is not in operation. Air cooling of the non operating oil guns tips in the firing position has been found to be adequate thus doing await the retract mechanisms

In this system, when the oil guns are out of operation they are not withdrawn but left in firing position itself. To protect the gun tips from overheating small quality of air at low pressure is supplied around the gun tip. Fins are provided to improve the cooling efficiency.

Basically, air cooled oil guns consists of finned cap nut and air sleeve around it. The fins of the cap nut increase the heat transfer areas thus protecting the cap nut and simultaneously provide very uniform distribution of cooling air to oil gun tip efficiently.

The gun tip receives radiated heat from the flame and conducts it to the finned cap nut through the oil gun body. Air passing through the fins cools the finned cap nut and is directed into the gun tip at exit.

To guide the cooling air flow through the finned cap nut and to ensure sufficient cooling air flow c lose to the gun tip, a directed air sleeve is mounted over the finned cap nut.

INSTALLATION

To facilitate easy insertion and removal of air cooled oil gun assembly with air sleeve, an oil gun guide pipe of larger diameter pipe is used. A highly reliable cooling air system with cooling air taken from FD fan delivery is provided to ensure minimum cooling air flow through air cooled oil guns under any adverse operation conditions.

POTENTIAL BENEFITS

  • Air cooled oil gun tips are subjected to lower temperature than retractable oil gun tips.
  • Minimizes the congestion at burner elevation,
  • Reduces the maintenance
  • Eliminates the number of working components / Complicated Retract mechanism
  • More economical than steam or compressed air cooling as the power requirements for low pressure cooling air is minimal.
  • Increase in life of the tip.
  • Can be retrofitted with old boilers easily without any major modification.
  • Oil guns remain in their firing position at all times – ready for immediate service
  • Oil guns remain cool and component life is increased
  • Eliminates “gun advanced’ and “gun retracted” limit switches
  • Simplifies control system
  • Increases accessibility to the burner front area

At present CCE &CE is offering this product as retrofit to the automatically retractable type oil guns for application in utility boiler and the performance is proved in lot of boiler installations.

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Contact Us

# 4, Gandhi Nagar, Koundampalayam, Coimbatore – 641 030, Tamilnadu – INDIA.

Telephone: 0422-2439179, 0422-2433989
FAX: 0422-2433982,
Others: 9443043917,
E-mail: fuelfiring@hotmail.com.