Vertical Sprial Fin Tube Power Plant Economiser Thermal Stress Reduction

Vertical Sprial Fin Tube Economizer In Power Plant Reduce The Thermal Stress

Economizer Description

The spiral finned tube is formed by welding the steel strip on the bare tube along the spiral track by high-frequency welding method. The spiral finned tube through fin material winding process and high frequency welding, can make the fin and tube pressure melting as a whole, the contact thermal resistance of approximate 0, and can withstand the alternating thermal stress. No deformation after welding, so as not to weaken the bearing capacity of the base pipe, is conducive to heat transfer from the fin to the inner wall of the base pipe.The serpentine pipe wound by the sprial finned pipe (the elbow part has no finned) is composed of the tube group as the heating surface of the economizer, that is, the sprial finned economizer.

Economizer is a device installed in the lower part of the boiler tail flue for recycling the waste heat of the exhaust smoke, heating the boiler feed water into the heating surface of saturated water under the steam drum pressure, because it absorbs the heat of high temperature flue gas, reduces the exhaust temperature of flue gas, saves energy and improves efficiency, so it is called the economizer.

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.

Compared with bare tube economizer, H-finned tube economizer can enlarge the heat exchange area and reduce the number of tubes. It also can increase the flue gas flow area in order to reduce the flue gas flow speed and abrasion.
H-finned tube can be made as double H finned tubes , with high rigidness to fit long tube row.
The spiral finned economizer is a newly designed heat transfer equipment, consists of spiral fin tubes to overcome the serious abrasion and short service time.

Function

1. Absorb the heat of low-temperature flue gas, reduce the smoke exhaust temperature, reduce smoke loss and save fuel.

2. Since the feed water is heated in the economizer before entering the drum, the heat absorption of the feed water on the heating surface is reduced, and the economizer can be used to replace part of the high-cost evaporative heating surface.

3. When the feed water temperature is raised, the wall temperature difference will be reduced and the thermal stress will be correspondingly reduced to extend the service life of the steam drum.

Specification

Application

Related Industry: Combined cycle power plant,Heat recovery steam generator(HRSG).

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.