HEATERS, DEAERATORS , PLATE TYPE EXCHANGERS , COOLERS ETC_ ABC OF THERMAL POWER PLANT

I have detailed major equipment of Turbine Package and their method of erection generally followed in India. There may be some differences during execution due project specifics but base is the same.

Already I have discussed main turbine , Generator and MDBFP and TDBFP.

In this article I will cover HP Heaters , LP Heaters , Deaerator , Plate type Heat exchangers ,coolers etc.

Erection Method of static equipment.

< All coolers are erected as soon as foundation is available.

   Normal foundation checking i.e level ,co ordinate w.r.t. turbine axis is checked before placement . Coolers are placed after checking the orientation. 30 mm to 50 mm packer plates are required for placement and subsequent secondary Grouting. Front piping opens after that as one end is fixed now. Same method is also followed for other heat exchangers. All the coolers are coming AB bay structures i.e Turbine hall.

HP heaters and LP Heaters

< In earlier days and upto 500MW plant all the heaters are erected vertically with the help of the TG hall EOT crane. An erection device is supplied with HP heaters for erection as clearance between EOT crane hook bottom and 10 M Turbine floor is minimal.Therefore erection device is necessary. 

Higher capacity unit like 660 MW and above heaters are placed Horizontally at BC bay of 17 M floor. Counter flanges for the connection of pipes to be checked .

Structural members for vertical heaters erection are to be checked , Specially welding between the members. It has been experienced that some of the members are not welded . Those are to checked and welded before erection. Also Level and co ordination are to be  checked and mark it in nearest column. This will help during piping erection for drawing reference. Vertical heaters are erected by EOT crane with a few packer plate in the bottom .As no grouting is involved therefore leveling and alignment is done through packer plate of different thickness.Once alignment is over then the heat is locked with temporary structure and release for piping.

Heaters require to be erected horizontally requires pre planning . All the heaters are erected one by one ,one after another side by side . Therefore pre planning is required to push heaters one by one . Heaters floor is concrete floor therefore guide rail is a must. Sequential erection is must otherwise there will not be enough space on the floor for overtaking . Location of heaters on 17 M floor such that approach is not available by EOT Crane. Heaters are unloaded on 17M floor at designated place.Dragging on rollers are carried out. Heaters are heavy weight items dragging to be done through particular place otherwise it can damage the concrete floor.

Picture shows horizontal heaters and Plate type heat exchanger . Erected and piping under progress from one end. 

continued to Part II