A fully premixed condensing heat exchanger

Abstract

The invention discloses a full-premix condensing heat exchanger which comprises a shell and a heat exchanger, wherein the heat exchanger comprises a first heat exchanger and a second heat exchanger; the first heat exchanger is connected with the second heat exchanger along the axial line; a heat flow partition for partitioning the shell into a primary heat exchange chamber and a secondary heat exchange chamber is further arranged in the shell; the second heat exchanger is arranged in the secondary heat exchange chamber; the first heat exchanger comprises first heat exchange pipes distributed along and around the axial line; the first heat exchange pipes are further connected with first fins; due to gaps between the first fins, a first fin group is formed; heat flow generated by combustion of mixed gas in the inner rings of the first fins is stopped by the heat flow partition and then penetrates through the gaps between the first fins to flow into the secondary heat exchange chamber, to exchange heat with the second heat exchanger. By the arrangement of the first fin group in the primary heat exchange chamber, enough heat exchange areas can be reserved between the heat flow and the first fins as well as between the heat flow and the first heat exchange pipes, and a proper gap is reserved between every two adjacent first fins; the heat exchanger is difficult to block and can difficultly corrode the first heat exchange pipes.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a fully premixed condensing heat exchanger. Background technique [0002] The existing fully premixed condensing heat exchanger is most commonly used in heat exchange devices such as wall-hung boilers. The flue gas containing heat generated by the combustion of mixed gas passes through the fully premixed condensing heat exchanger, and convectively flows through the fully premixed condensing heat exchanger. The water is preheated, the heat carried by the flue gas is absorbed and condensed, and the heated water flows into the wall-hung boiler to be used by the heat exchanger. [0003] The existing fully premixed condensing heat exchanger includes: an outer shell and ring-shaped heat exchange tubes coiled layer by layer. The heat exchange tube is a flat structure, and the outer shell wraps the heat exchange tube. The mixed gas enters the inner ring of the heat exchange tube from the air inlet an...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the prior art is that: in order to prevent scale blockage in the heat exchange tube, it must be set to a certain cross-sectional size. In order to meet the needs of heat exchange in a limited space, more heat exchange tubes must be stacked, which compresses the coiled heat exchange tube. The heat flow passes through the gap, and there are a lot of solid particles in the heat flow that will adhere to the surface of the heat exchange tube to form ash blocking, and the adhered dust will further aggravate the process of ash blocking, affecting the pre-designed resistance of the heat exchange tube The balance of the heat exchange tubes will cause the heat exchange tubes to be unable to exchange heat evenly, reducing the heat exchange efficiency of the entire heat exchange tubes, and the solid particles directly adhering to the tube wall are also acidic, which will corrode the heat exchange tubes and affect the heat exchange tube performance. life span

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