Economiser Coils

Boiler Economiser Coil is the Energy improving device in the lower part of the flue gas duct of a boiler for recovering the residual heat of the exhausted smoke. that helps to reduce the cost of operation.
If the exhaust gases which are leaving the Boiler at such high temperature is made to pass through the Economiser Coil in order to provide the required sensible heat to the water by increasing its temperature, it will reduce the heat load on the boiler to the greater extent.
Economizers are commonly used as part of a heat recovery steam generator (HRSG) in a combined cycle power plant. In an HRSG, water passes through an economizer, then a boiler and then a superheater. The economizer also prevents flooding of the boiler with liquid water that is too cold to be boiled given the flow rates and design of the boiler.
A common application of economizers coil in steam power plants is to capture the waste heat from boiler stack gases (flue gas) and transfer it to the boiler feedwater. This raises the temperature of the boiler feedwater, lowering the needed energy input, in turn reducing the firing rates needed for the rated boiler output.

Advantages of boiler economizer 

• Improve cycle efficiency and reduce coal consumption;
• Improve the dust removal efficiency (pre-installation of the dust collector);
• Reduce the desulfurization tower evaporation, save water.

Abbtas boilers  has fabricated economizer coils for virtually all of the HRSG, Utility boiler companies and understands the unique features of each.
Abbtas boilers is a one-stop shop for economizer fabrication because we prep all the materials and perform all of the pressure part and attachment welding, from finning the fintubes, fabricating the headers, and assembling the coil bundle.
Abbtas  can produce economizer elements with either bare, spiral finned, or long finned tubes,H Fin , Double H Fin and if you prefer, re-design your unit to one of the other tube-types. HDB can also fabricate replacement headers for all utility boiler economizers.

Specifications

Description	Boiler economizer
Material	Alloy steel, Carbon steel, etc.
Material standard	ASTM, EN or ISO etc.
Dimension	Customization
Weight	Min: 10 ton Max.:100 ton
Smelting Process:	EF+LF + VD
Process	Raw Material Testing → Precision Cold Bending-→ Welding → 100% Radiography → Heat treatment (Normalizing+ tempering) → Inspection →rough machining→UT →2nd Heat treatment →finishing machining →Hydro testing →Inspection
UT standard	ASTM A388 or EN10228, etc