SU1370372A1 - Recuperator - Google Patents

Abstract

The invention relates to a power system and heat engineering and is intended to use the heat of the flue gases of industrial flame furnaces to heat the air supplied to the combustion. The purpose of the invention is to intensify heat transfer and simplify the design. For this, the inner box 1 is made of metal mesh. This allows the use of convection, heat transfer by direct air contact with the flue gases and due to radiation through the grid cells. 1 il. 6 (L

Description

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The invention relates to heat and power engineering and is intended to use the heat of flue gases from industrial flame furnaces to heat the air supplied to the fire.

The purpose of the invention is to intensify heat exchange and simplify the design.

The drawing shows a recuperator, - a general view.

The recuperator contains coaxially mounted inner and outer boxes 1 and 2, forming the central smoke and annular air channel 3 and 4, respectively, the last of which, channel 4, is equipped with tangentially installed inlet and outlet nozzles 5 and 6, respectively. The inner box 1 is made of metal mesh.

The recuperator operates as follows.

Air under a small pressure of 100 - 600 mm of water. and with a density of p 1.29 - 1.2 kg / m enters through

pipe 5 in the annular air channel 4, where it is twisted into a cylindrical vortex. At the periphery of the vortex, an overpressure zone is created and in the center, behind the screen wall of the inner duct 1, a rarefaction zone.

In the rarefaction zone, hot combustion products enter (flue gases with a density of 0.3–0.4 kg / m), which give up their heat by convection, heat transfer, and radiation from the wall of the box 1, made of metal

of the spirit

The heated air rises through the annular air channel 4 upwards and enters through the nozzle 6 into the furnace burner.

Due to the difference in the specific gravities of heated air and combustion products, their mixing becomes minimal, and partial mixing is useful in terms of improving heat transfer conditions and protecting the air basin from harmful emissions (CO,

N0, etc.).

Making an inner duct of metal mesh when placing the inlet and outlet nozzles tangentially allows the use of convection, the transfer of direct air contact with the flue gases and due to radiation through the grid cells.

Making the inner box 1 from the metal mesh allows the heat exchanger to be made without a compensator, since the grid performs its role, which simplifies the design of the heat exchanger.

Claims (1)

Invention Formula A recuperator containing coaxially installed inner and outer ducts forming the central smoke and annular air ducts, the latter of which is provided with tangentially fixed inlet and outlet nozzles, characterized in that, in order to intensify heat exchange and simplify of the grid, and through its cells — directly into the structure, the internal box of a rotating flow is carried out of the metal grid.