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        2. H-type Fin Tube Economizer H
          H-type Fin Tube Economizer H

          Structural Feature:
                The H-type fin tube forms the fin by welding two steel sheets with round arcs in the middle symmetrically to a bare tube. Its front shape resembling the letter H and is thus so named.
                The H-type fin tube adopts the flash resistance welding technology. After welding , the weld has high fusion ratio and strong tensile strength. The tube makes good thermal transmission performance and greatly increases heat transfer area.
                H-type fin tubes include single fin tube and double fin tube . Among them, the single fin tube has a flexible structural design with good cooling effects so it is normally used for high temperature sections.
                The double fin tube has a structure of good rigidity and can be used for long tube bank.
                The tube materials of H-type fin tubes are the same as that of bare tubes. The fin materials can use carbon steel or heat-resistant alloy steel according to temperature.


          Basic Parameters:


          Strengths:
                Increased heat transfer area, compact structure, reduced arrangement space. The heat transfer area per unit length of the H-type fin tube is 3-5 times that of common bare tubes. In the case of identical heat transfer, the arrangement height can be reduced by over 40%. When the space is limited, it can be sued to lower gas exhaust temperature.
               Good wear resistance. The H-type fin tube adopts sequence arrangement where the elbows are arranged outside the flue duct. With the flow stabilizing effect of the fins. If other conditions are the same, the wear life will be 3-4 times higher than the bare tube.
                Reduce the tube wall dust. Since the H-type fin tube can adopt higher flow rate and the guiding effect of the fins can reduce the flue gas vortex occurrence, the dust deposited on the pipe wall can be reduced.

          Applications:
                For economizer of all levels for the boiler in the power station.
                For economizer reformation during desulfurization and denitrification projects and it can save arrangement space.
                For low temperature economizer reformation and it can reduce the flue exhaust temperature by 30-70℃.
                For economizer reformation to lower flue exhaust temperature, prevent wear and reduce dust deposit.

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