SU1435888A1 - Heat exchanger - Google Patents

Abstract

Invention m. B. used for steam water heating from turbine sampling, as well as in industrial boiler boilers. The purpose of the invention is to increase the efficiency of heat transfer from the condensing vapor. In the upper part of the vertically installed housing 1 there is a distribution chamber 2 of heated water, and in the lower part there is a rotary chamber 3. Chambers 2 and 3 are divided by vertical partitions 4 into cavities 5, to which the tube bundles 6 are connected, separated by horizontal partitions 7 into equal parts section height. Between the bundles of pipes 6, lifting pipes 8 are installed, connecting each cavity 5 of chamber 3, followed by cavity of chamber 2 along the water flow. Due to the fact that the diameter of pipes 8 is larger than the diameter of pipes 6, heat exchange mainly occurs during the descending movement of water, which causes minim. t-ru water at chamber 2 and max, at camera 3. T. arr. due to the greater flow rate of steam through the upper section, its hydraulic resistance is greater than that of the lower section, which creates a pressure drop above and below the bulkheads 7. This leads to a decrease in condensate leakage through the annular gaps at the points of passage of the pipes 6 and a decrease in the average thickness of the condensate film on their surface which increases the efficiency of heat transfer from condensing steam. 2 Il. f S (L

Description

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The invention relates to heat exchangers installed in low pressure regenerative heating systems and heat supply systems designed to heat water with steam from turbine selections, as well as boilers of industrial boilers.

The purpose of the invention is to increase the efficiency of heat transfer from the condensing vapor.

FIG. 1 shows a heat exchanger, cross section; in fig. 2 - the same, longitudinal section.

The heat exchanger contains a vertically installed housing 1, in the upper part of which there is a distribution chamber 2 of heated water. In the lower part of the housing there is a rotating camera 3. The chambers 2 and 3 are divided by vertical partitions 4 into separate cavities 5. To the cavity 5, bundles of pipes 6 are connected, divided by horizontal partitions 7 into equal sections.

The heat exchanger is equipped with lifting tubes 8 installed between the bundles of tubes 6 and connecting each cavity 5 of the turning chamber 3 with the subsequent distribution of the chamber 2 along the water flow. The diameter of the lifting tubes 8 is much larger than the diameter of the pipes b.

To the housing 1 attached pipe 9 steam supply, located on the side forming the housing 1, the pipe 10 condensate drain from the bottom of the housing 1, the pipe 11 supply heated water and the pipe 12 drain water.

In the lateral generatrix, a perforated pipe 13 is vertically installed opposite the steam inlet 9, for removing non-condensable gases. A bundle of pipes 6 is placed in the casing 14, which has a slot across its entire height to allow steam to enter the pipes 6 of the heating surface.

The heat exchanger operates as follows.

The flow of heated water through the pipe 11 enters the input cavity 5 of the distribution chamber 2, moves down the pipes 6 and enters the first cavity of the turning chamber 3 as the water moves. Then the water flows through the lifting pipes 8 into the next distribution cavity 2 along its course. Having thus made several strokes, the heated water is discharged from the heat exchanger through the nozzle 12.

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The steam enters the housing 1 through the pipe 9 and is evenly distributed over the height of the housing 1 through the slot in the casing 14. The steam passes successively in the annular space of the tube bundles 6 from the last to the first course of heated water. The non-condensable gases are discharged through the perforated vertical pipe 13, and the condensate of steam is removed from the housing 1 through the pipe 10.

0 As a result of using lifting pipes 8 with a diameter substantially larger than the diameter of the tubes of the beam of pipes 6, heat exchange generally occurs during the descending movement of water. The temperature of the water in

with each stroke, it has a minimum value for the distribution water chamber 2 and a maximum value for the rotary chamber 3. Therefore, the amount of condensed steam in the first section (counting from the distribution chamber 2) will be more than

0 in the second. Accordingly, in the second section it is more than in the third, and so on. Considering that all sections are the same in height and heating surface, the hydraulic resistance of the upper section due to the higher steam consumption through it will be greater than for the lower one. The created pressure difference above and below the horizontal baffles 7 leads to a significant decrease in condensate leakage through annular gaps at pipe 6 passages. In this way, the average thickness of the condensate film on the surface of pipes b decreases and the heat transfer efficiency from the condensing vapor increases.

Claims (1)

Invention Formula 5 A heat exchanger containing a vertically mounted housing, located in the upper part of the latter, a distribution chamber of heated water and a rotating chamber, separated by vertical partitions into separate cavities, tube bundles, 0 connected to cavities and separated by horizontal partitions into equal sections of height, characterized in that, in order to increase the efficiency of heat transfer from the condensing steam, it is equipped with lifting pipes installed between the tube bundles and connecting each cavity of the rotating chamber with subsequent along the water flow, the cavity of the distribution chamber, and the diameter of the lifting tubes is larger than the diameter of the tubes in the bundle. one 9i, yy