A narrow-gap oblate double-coil integral condensing boiler

Abstract

An integral condensing boiler with narrow-gap oblate double-coil tubes, including an outer shell, in which the heat exchanger is composed of multi-circle oblate double-coil tubes inclined at a preset angle with gaps between the coils, and oblate double-coil tubes The tube is made of oblate pipe from top to bottom by the outer pipe ring and coiled by the inner pipe ring from bottom to top. The inner pipe ring is surrounded to form the radiation heat exchange space in the furnace. Between the disc-shaped upper partition and the disc-shaped lower partition, the topmost opening of the outer ring is the double-coil water inlet, and the topmost opening of the inner ring is the double-coil water outlet; the full premix burner is installed on the top plate of the shell Above, the head of the fully premixed burner goes deep into the radiation heat exchange space in the furnace for combustion and heat release, and the flue gas flows through the gap between the inner tube ring and the outer tube ring of the oblate double-coil tube, and flows out from the flue gas outlet; the present invention It has the advantages of simple structure and simplified manufacturing process, and at the same time strengthens the flue gas side laminar convection and condensation heat transfer, making the whole heat exchanger very compact.

Description

technical field [0001] The invention relates to the technical field of integral condensing boilers, in particular to an integral condensing boiler with flat and circular double-coil tubes with narrow gaps. Background technique [0002] For a long time, my country's energy production and consumption have been dominated by coal. my country's air pollution belongs to the "first generation" soot-type pollution, which is mainly caused by coal combustion. The experience of many big cities in the world shows that the fundamental way to improve the air pollution is to improve the fuel structure. Burning natural gas basically does not emit or emit a small amount of SO2; nitrogen oxide emissions are 45% lower than coal burning, 63% lower than fuel oil; CO2 emissions are 52% lower than coal burning, 26% lower than fuel oil. Secondly, natural gas has obvious energy-saving benefits in heating. Implementing energy structure adjustment, vigorously developing natural gas, and partially r...

AI Technical Summary

Problems solved by technology

However, the use of extended heating surface structure will inevitably lead to complex structure and increase the difficulty of maintenance and repair

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