Skip to main content

Operation of main engine with turbocharger out of operation

The following engine/turbocharger arrangement will be detailed: Six cylinder main engine, utilizing a constant pressure turbocharger arrangement with two turbochargers. The turbochargers use ball/roller bearings, externally fitted.
  • The damaged turbocharger needs to be isolated from the air, exhaust and water sides. The exhaust inlet to the turbocharger can be isolated by the fitting of a spade in the pipeline between the exhaust gas manifold and the turbocharger inlet.
  • The air side can not be isolated as the auxiliary blower takes its suction via the air filter, thus air isolation of the turbocharger relies on the non return valve fitted at the inlet to the scavenge air manifold.
  • As there is no longer any gas flow through the turbocharger, then the water cooling can be isolated by closing the inlet and outlet valves.
  • The oil in the bearings can also be drained, and the rotor locking plates fitted to prevent any possible rotation of the defective turbocharger rotor. The rotor can be left in place until replacement parts are obtained and fitted.
  • If the engine was operated at lower powers then the auxiliary blowers may be operated. The electrical load on the auxiliary blowers would need to be monitored if they were operated, to prevent any overheating of the motor.
The factors which may limit operation of main engine without turbocharger are the following:
When one of the two turbochargers is isolated, this will reduce the possible air input to the engine, and hence full engine power can not be developed. The following factors need to be considered when operating the engine:
  • Exhaust temperatures: These will rise with the reduction in air delivery. The engine manual would be consulted as to the maximum limit, and this will be around 500 degrees.
  • Exhaust smoke levels: These will also rise, and excessive smoke will cause fouling of the turbocharger and exhaust gas boiler.
  • Maximum engine power: This will be limited due to the factors stated above, and this will probably be approximately 50% power with the loss of one of the two turbochargers.
  • Acceleration of the engine: When the engine load is increased then the time taken to increase the load would need to be extended to prevent excessive thermal load.
  • Speed of the remaining turbocharger: When the engine load is reduced this will also reduce the gas energy, which should ensure that the speed of the working turbocharger would not be excessive, but the engineering staff should also monitor this.
Hence the engine power would be reduced in consideration with all the above factors
Labels:

Comments

  1. amberheatboilersSeptember 2, 2024 at 8:38 AM

    Excellent post. I really enjoy reading and also appreciate your work.Gas boiler repair specialists This concept is a good way to enhance knowledge. Keep sharing this kind of articles, Thank you.

    ReplyDelete

Post a Comment

If you have any doubts.Please let me know

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators
9 comments
Read more

Main engine interlocks

Interlocks are provided so that the engine can be started or reversed only when certain conditions have been fulfilled. When there is a remote control of engines, it is essential to have interlocks. This reduces the possibility of engine damage and any hazards to the operating personnel. Turning gear Interlock . This device prevents the engine from being started if the Turning gear is engaged. Running Direction Interlock . This prevents the fuel from being supplied if the running direction of the engine does not match the Telegraph. Starting Air Distributor in end position . This prevents starting from taking place if the shifting of the Distributor has not been completed. Main Lube. oil pressure, Piston cooling pressure, Jacket water pressure, and important parameters must be above the required minimum. Auxiliary Blower Interlock . The Auxiliary Blower is provided in case of Constant pressure turbo charging. Air Spring pressure Interlock . In case of the present generation
7 comments
Read more

Why is a man hole door elliptical in shape?

Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole  is lesser in size than the corresponding circular hole. More over it is prime concern to have a  smoothed generous radius at the corners to eliminate stress concentration. Hence other  geometrical shapes like rectangle and square are ruled out.  To compensate for the loss of material in the shell due to opening, a doubler ring has to be  provided around the opening. The thickness of the ring depends on the axis length along the  dirrection in which the stresses are maximum and the thickness of the shell. It is important to  align the minor axis along the length of the vessel, as the stress in this direction is  maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t=  thickness of the shell plating  Circumferential stress: Pd/4t  More over a considerable material and weight saving is achieved as minor is along the  direction of maximum stress.
20 comments
Read more