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Saturday, June 9, 2018

Nozzle Cooling Module for HFO Power Plant



Fuel injection nozzle cooling module used to provide continuous nozzle cooling water flow in HFO power plant used to cool down fuel Injection nozzle. It is very important to cool down the nozzle to reduce wear down of nozzle due to fuel combustion. Different components such as pump, water reservoir, expansion vessel, heat exchanger etc. installed in this module.
Nozzle Cooling Unit

Description of the components:
  • Centrifugal Pump
  • Water Reservoir
  • Pressure Expansion Vessel
  • Heat Exchanger
  • Control Panel
  • Thermostat Valve
  • Inspection Glass
  • Inspection and Measuring Instruments
  • Venting Float Valve
  • Different Types of Valve
Description of Nozzle cooling unit:
There are two types of coolant media circuit. One is nozzle cooling circuit, another engine coolant circuit (to cool down nozzle cooling coolant).
Nozzle cooling module- Coolant flow circuit

Water reservoir preserves the cooling water from there a centrifugal pump draw coolant and pumped to the system. Centrifugal pump pumps the coolant through temperature control valve (thermostat valve) and heat exchanger....READ MORE


Nozzle cooling module
The operation of the temperature control valve and the heat exchanger depends upon the temperature of the coolant returned from the engine. If the temperature is higher than the allowable limit for engine inlet, temperature control valve allows more coolant flow through the heat exchanger.


Wednesday, June 6, 2018

Oil Mist Eliminator (OME) -Function & System Description for Diesel Engines



Oil mist eliminator(OME) of a diesel engine used to separate lubrication oil from oil mist produce in the crankcase. OME connected with crankcase venting pipe. In internal combustion engines,specially diesel engine running with heavy fuel oil some combustion gases always enter between the piston rings and the sleeve in the crankcase (called the blow-by). Without venting, these combustion gases will cause an unacceptable pressure increase in the crankcase. 
Oil Mist Eliminator

Function

The oil mist eliminator is driven by a fan. The attached electronic PID controller – with a pressure transmitter and frequency converter – maintains the exact negative pressure desired in the crankcase, even under variable operating conditions. Oil mist eliminators have a low pressure drop of 3-5 mbar to ensure reliable operation of the regulation and in order to avoid an inadmissible pressure increase in the crankcase.

System Description
The oil mist eliminator usually driven by motor powers a fan which sucks air charged with oil particles through the suction line attached to the air intake from the discharge of the crankcase of the internal combustion engine.
The air charged with oil particles flows first through the coalescence filter and then through the fine filter. 
OME System Description

In the coalescence filter the fine aerosol droplets agglomerate to larger drops (due to the so-called coalescence effect), until they flow downwards by gravity.....READ MORE


Monday, June 4, 2018

Fuel Injection Pump Plunger Stroke Height / Plunger Lift Measurement(MAN B&W Engine)



Actual or precise fuel injection timing is very much important for proper combustion of the fuel. A regular fuel injection pump plunger stroke height or lift measurement is necessary to achieve proper combustion.
Every time after replacement or overhauling fuel injection pump it is impotent to measure and adjust fuel injection pump plunger stroke height or lift.
Injection timing is measured by dial indicator when the pump plunger stroke at TDC and Advanced from TDC (Fly wheel mark) ie, fuel injection pump plunger free and pushed with cam lobe.
Fuel Injection Pump Plunger Stroke Height Measurement Procedure:
 

At first remove the cam cover.
Cam lobe free of cam follower




  READ COMPLETE PROCEDURE

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