SU1636641A1 - Air heater - Google Patents

Description

one

(21) 4609352/06

(22) 11/28/88

(46) 03/23/91. Bul № 11

(71) Belarusian branch of the All-Union State Research and Design Institute VNIGTIEnergoprom

(72) S.N.Andreev

(53) 621.181.6 (088.8)

(56) USSR Copyright Certificate No. 974030, cl. F 22 B 1/18, 1981.

USSR Author's Certificate No. 1302095, cl. F 23 L 15/04, 1985.

(54) AIR HEATER

(57) The invention relates to a heat exchange technique and can be used in fuel combustion installations. Its purpose is to improve the efficiency of operation during variable temperature conditions. Flue gases (G), the passage through the flue 2, wash the evaporators 6 heat pipes (T) and give them heat. The air passing through the air duct 1 washes the condensers 7 T and heating -1. The T in the latter in the course of the group is washed with cold air, which determines their minimum temperature. To keep the temperature at a sufficient level to prevent corrosion, T is moved so that their evaporators 6 are lengthened and the condensers 7 are shortened. This ensures corrosion prevention - and increases efficiency. 2 Il.

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The invention relates to a heat exchange technique and can be used in fuel combustion plants.

The purpose of the invention is to increase the efficiency of operation during operation in variable temperature conditions.

It shows the air heater, general view; FIG. 2 shows the node I in FIG. one

The air heater contains countercurrent duct 1 and duct 2, separated by a longitudinal partition

3c fixed in it with possible axial movement in the sleeves

4 heat pipes 5, evaporators 6 of which are inserted into gas duct 2 with their ends located within the latter, and condensers 7 are an air duct

1 with a similar arrangement of their ends within the latter. The air heater also contains guides arranged in gas duct 2 and duct 1, made of three parts 8-10 pivotally interconnected, with the middle part 9 of each guide being adjacent to the ends of the evaporators 6 and condensers 7, and the side parts 8 and 10 movably secured with their edges on the walls of the duct 2 and the duct

1, with one edge of the portions 8 and 10 hinged, and the other with the possibility of horizontal movement. For moving the parts 8-10 of the guides, fasteners 11 are provided with them.

The air heater works as follows.

Flue gases, passage through the gas duct

2, wash the evaporators 6 pipes 5 and give them heat. The air, passing through the duct 1, washes the condensers 7 of the heat pipes 5 and heats up. Last in the course of the gas range of heat

pipe 5 is the first in the course of the air. Thus, the heat pipes 5 in it are washed by the most cooled gases and the coldest air, which determines the minimum temperature of these heat pipes 5 in the beam.

To maintain their temperature at a sufficient level to prevent low-temperature sulfuric acid corrosion, the evaporators 6 heat pipes 5, washed by the heating gases, are lengthened. Accordingly, the condensers 7 heat pipes 5, cooled

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spirit, shortened. To enable efficient operation of the air heater at different temperatures, heat pipes 5 move in sleeves 4. To prevent flue gases and air outside the heat pipe bundle 5, simultaneously with the movement of the latter, the positions of the guide parts 8 10 change.

Thus, the temperature of the heat pipes 5 is maintained sufficiently high to prevent low-temperature sulfate corrosion by increasing the surface (length) of the evaporators 6 and, accordingly, reducing the surface (length) of the condensers 7, and not due to the high flue gas temperature. Since it is possible to lower the flue gas temperature, the efficiency of using the air preheater increases accordingly.

The guides of parts 8-10 installed in the duct and air duct prevent the passage of heating gases and cold air in addition to the heat pipe bundle 5. As a result, the velocity of the medium at the start increases and the heat exchange is intensified. The breakthrough of the air heater of part of the flue gas, in addition to the heat pipe bundle 5, is prevented. This also reduces the flue gas temperature and increases the efficiency of the air heater.

Claims (1)

Invention Formula An air heater containing countercurrent duct and duct, separated by a longitudinal partition with heat pipes axially mounted with the possibility of axial movement, the evaporators of which are inserted into the duct with their ends located within the latter, and the condensers in the duct efficiency in operation in variable temperature conditions, it additionally contains guides placed in the duct and duct, while the ends of the capacitors are placed in the air duct, and each of the guides is made of three parts pivotally interconnected, with the middle part of each rail placed adjacent to the ends of the evaporators and the contiguous 16366416 heat pipe capacitors, and the side parts are movably fixed by edges to the walls of the duct and duct, respectively. FIG. 2