111.Whether the blowing pressure will be same for all the blowers? How to set the blowing pressure?

The blowing steam pressure for soot blowers will be different between them. The blowers for final super heater/re-heater will be maximum. The pressure depends on the temperature in  that zone. Pressure at super heater zone will be 22 bar, convection super heater zone is 12 bar, economizer zone is 10 bar and it is 8 bar for air heaters.

The soot blower steam will be taken after primary super heater before attemparator . It will be reduced to 25 bar. Each soot blower will be provided with a valve. The lift of the valve can be adjusted by a nut. Hence the pressure after the valve,

the blowing pressure, can be adjusted as requires. Throttling of the valves shall be avoided if possible.

First the soot blower far away from the reducing station in super heater zone shall be selected. A pressure gauge shall be fixed after the valve. The valve shall be left full open. Confirm the blowing pressure. Adjust the soot blower steam header pressure to get the blowing pressure of the soot blower.

Move upward towards reducing station and set the blowing pressure by throttling the valve. The temporary pressure gauge shall be used for confirmation.

Re-adjust the station if it is to be increased to get the highest blowing pressure and repeat downward and set the pressure bu adjusting the lift of the blower valve.