SU567897A1 - Regenerative heat exchanger - Google Patents

Description

one

The invention relates to heat engineering, in particular to heat exchangers of the regenerative type, designed to preheat air and other gas using heat from waste gas.

Regenerative heat exchangers are known with a heat transfer surface, in the form of a bulk material, moving with a dense layer under the action of gravity between the fixed guides in the form of a louvered grille. Top-down bulk material and intermediate heat transfer fluid — blown by horizontal gas flows, thus forming a cross-current. Transportation of the coolant from the lower chamber to the upper one is carried out by a special device 1.

Such a scheme of gas flows and a heat transfer medium limits the speed of their movement, which does not allow to intensify the heat exchange and reduces the bulkiness of the structure in height.

This disadvantage is partially eliminated in the regenerative heat exchanger, which

is closest to the proposed technical solution. The heat exchanger contains vertically installed heating and cooling chambers connected by flow pipes f2.

Gases and coolant are moving in it in

countercurrent, and for uniform distribution of coolant and stabilizing it

Urszn distributors are made in the form of tube sheets with tubes fixed in them, the free ends of which are located at a level equal to the height of the layer of the corresponding umbrella.

The disadvantage of such a heat exchanger is the unreliability of the circulation of the coolant from the lower chamber to the upper chamber, carried out by a special lifting device.

The aim of the invention is to ensure reliable circulation of the heat transfer fluid, which is driven into a fluidizing (new state, between the chambers of ploobmonl.

These are dhh tigarts by the fact that the ends of the pipes, which are attached to the chamber, in the upper chamber are mixed at different heights within the fluidized-coolant coolant.

Such an embodiment of a tvp-exchanger assists the movement of the solid phase (hy-carrier / from the lower chamber to the upper cocoon, for coarse, the ends of which are located in the upper chamber above, and from the upper chamber to the lower one through pipes, the ends of which are located below.

The drawing schematically shows the npe / tfoldable heat exchanger.

In the body 1 of the heat exchanger, the upper chamber 2 is designed to heat the carrier and the lower chamber 3 to cool it and accordingly to heat the air. Chambers 2 and 3 have gas distribution grids 4 and 5 and are separated by a horizontal blind wall 6.

Chambers 2 and 3 communicate with each other by two vertical pipes 7 and 8, installed in such a way that their upper ends are displaced in a vertical plane and one relative to the other. The upper end of the pipe 8, designed to transfer the coolant from chamber 2 to the chamber

3, is located on the top of the gas distribution grid 4, and the other end of the pipe 7, intended for transporting the coolant from the chamber 3 to the chamber by pneumatic transport, is raised above the grid 4. The heat exchange is also provided with nozzles for supplying and discharging the gases entering into the heat exchange. .

In case of hot burning products under the grill 4 of chamber 2, and heated air under the grill 5 of chamber 3, the coolant in them will be in a fluidized state and will flow down with a charge of 7 & 8. After the heat carrier reaches the end of the pipe 7, after lifting its upper Tqjeu up, it begins to empty, the pressure of the heat carrier column drops and under the action of overpressure in chamber 3 the heat carrier begins to iodine. And since, along pipe 8, heat-insulator continues to move downwards in a dense layer, its circulation circuit closes with. At steady motion of the coolant, its circulation is not disturbed if; the upper end of the pipe 7 is displaced downwards within the height of the fluidized bed of chamber 2.

Thanks to such an organization of the circulation of the coolant, the coolant can be safely transported without the use of mechanical means.

Formula

acquisitions

A regenerative heat exchanger with a free flowing coolant containing vertically arranged chambers in the cooling of the coolant, connected by flow pipes, and the fact that, in order to increase the reliability of the circulation of the coolant, brought into a fluidized state outside, the ends of the tubes at the top the chamber size of the sheva at different heights within the pseudo-fluidization layer of the coolant.

Sources of information taken during the examination;

1. USSR author's certificate

No. 245268, cl. G 23 U 15/02, 1969.

2. Author's certificate; USSR 80

J 197080, class G 23 U 15/02, 1967.

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