COMMISSIONING BOILER ALKALI BOIL OUT ,ACID CLEANING PART -I -ABC OF THERMAL POWER PLANT.

I have discussed about commissioning fans and its lubrication oil system . I have also discussed

the commissioning of fuel oil ( light Diesel Oil and Heavy  Fuel oil) system. This commissioning

includes acid cleaning ,rinsing and flushing of lines and restoration. There are other equipment

also which can be commissioned separately. Those are valves and dampers , soot blowers (specially

air heater soot blower which is required early because of oil firing of unit at the beginning ) .

However commissioning as system will be starting from ALKALI BOIL OUT AND ACID

CLEANING ACTIVITIES.

For these activities original equipment Manufacturer's

recommendation should be followed as they are best judge of their

Boiler.  

OBJECTIVE

However here I will try to give a glimpse of the activities and its requirement to the benefit of the

reader. My project will be restricted to standard 500MW set and also 660MW set .

The objective of this commissioning schedule is to clean the internal surface of the steam generating

portion and heating surface (Economiser) using specified chemicals.

  

The objectives are achieved by carrying out the following testing proposals.

 

By carrying out an effective boil-out, grease and any protective coatings applied are removed.

 

Then, it is subjected to acid cleaning for the removal of patchy mill scale and rust.

 

Finally, the acid pickled surface is passivated for the formation of uniform and coherent magnetite l

layer.

REQUIREMENT OF SERVICE

Prior to the commencement of chemical cleaning, all the demineralised water storage tanks

should be kept full and the demineralising units kept in regenerated condition.

Approximately, 6000 m3  of demineralised water will be consumed for the  entire process. At

any time of acid cleaning, a minimum of two boiler volumes (app. 1400 m3 ) of

demineralised water should be available in ready stock to facilitate rapid flushing of the

system in the event of chemistry upset.d valves

Temporary pumping station will be required for filling up boilers with chemical. For a

power station where two to three units are there 05 numbers pumps are planned. This

need temporary foundation ,electrical connections ,pipelines ,valves and tanks etc to

be installed . Adequate safety precaution to be taken though it is temporary work.

Now a- days a few vendors are available to do the alkali boil out and acid cleaning

with their own equipment .

Advantage of having own equipment is that the same can be used for pre boiler flushing

of condensate ,feed water ,drip lines etc. We have seen the system is being used time

and again as per requirement.

Neutralising pit will be required to neutralize the chemical acid /alkali coming out from

boiler during draining and rinsing . Pit capacity will be three times the volume of boiler

water.

continued to PART -ii

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