COMMISSIONING OF SCANNER FAN -BOILER -ABC OF THERMAL POWER STATION

The scanner fan consists of following equipment and system

Suction Filters

2 Nos. fans with motor. (AC and DC Scanner fans)

Suction Dampers

Discharge Dampers

Auto Dampers (Emergency damper) and individual scanner air line.

Discharge Ducts

Local Instruments

The Commissioning of Scanner Air Fans and its system is carried out as follows:

a.   Flushing of Suction Duct and Discharge Duct

b.   Trial run of fans. Following common service to be arranged before commissioning. - Adequate manpower for commissioning ( generally arranged by erection vendor) - Readiness of LTMCC for scanner fan motor. - Availability of safe platform with adequate illumination. -Clean surroundings i.e without any debris nearby or loose material.                                                     -Mechanical cleaning /manual cleaning of circular duct completed. - Ensure duct system and other equipment are erected as per drawing. -Filter element are removed ,cleaned and kept outside. - Inlet /outlet dampers erected and fully operational from local/ remote. - Emergency damper erected and operation. - Logics of fan start stop checked . - End piece of scanner suction duct has been removed. - All final connection like hoses etc are removed and kept open. Suction and Discharge Duct Air flushing -After removing the suction filter element and suction duct piece, start any one of the FD Fan and load the fan to maintain 300 Discharge Pressure. Open the suction damper of scanner fan and flush the duct up to fan suction for 10 minutes. Close the suction damper and again open and flush for 10 minutes. This is repeated till the duct is clean as seen from blown out air. -Restore the suction duct with fan. Start and complete the trial run of fan & motor for 4 hours. For this trial run, FD Fan need not be in service. For the first 2 hours, the fan trial run carried out with FD discharge as suction to the fan and next 2 hours, the emergency damper in fan suction kept opened. During this trial run, load current of the fan noted down once. -Normalise the filter and scanner hoses.  Start the scanner Air fan and complete the trial run for 4 hours. (Suction from FD discharge for 2 hours and Emergency damper in open condition for 2 hours). Load current of the fan again noted down once. - Arrange calibrated vibration reading meter to measure vibration of Fans   and motors ( DE and NDE) - Calibrated tongue tester to measure no load and other load current. - If all the instruments are in place then measure the suction pressure   when FD fan is running and also corresponding discharge Pressure. - Record ,protocol all the reading and status for further use. - Before start check the lubrication status of all bearings and freeness   motor and fan separately.  ( value given based on 500MW set.) P.S If  you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below LINK 1 - PLEASE CLICK HERE  LINK 2 - PLEASE CLICK HERE ( value given based on 500MW set.)