SU1052782A1 - Vertical steam-to-liquid heat exchanger - Google Patents

Abstract

VERTICAL FLUID-HEAT EXCHANGER, mainly a regenerative steam turbine heater, including a housing inside which is installed a vertical tube bundle fixed in the upper and lower tube plates, a water distribution collector and a condensate collector, which is so designed that it is easy to use a distribution box and a condensate collector, in order to ensure ease of maintenance, to ensure the availability of water, a distribution box and a condensate trap can be provided. the condensate collector is made in the form of a cylindrical annular chamber and is located in the upper part of the oraspredelitelnogo collector.

Description

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The invention relates to a tenlo exchanger and can be used to heat a liquid with steam or to cool and condense the steam with a cooling liquid, in particular for heat exchangers for regenerative heating of feedwater for turbo units of thermal and nuclear power plants.

A vertical vapor-liquid heat exchanger is known, which contains tube bundles placed in a housing and a lower distribution-prefabricated water chamber divided into parts by a tube plate 1.

In this heat exchanger a condensate layer is formed under the tube plate, which excludes a part of the tube surface flooded with condensate from the condensation process and leads to the formation of a stagnant zone above the tube plate.

In addition, the placement of the distribution and collecting water chamber in the housing will require maintenance of the heat exchanger.

Also known is a vertical vapor-liquid heat exchanger, a predominantly regenerative heater of a steam turbine plant, comprising a housing inside which a vertical tube bundle is fixed, fixed in the upper and lower tube plates, a water distribution collector and a condensate collector 2J.

This heat exchanger has the disadvantage that the water distribution collector and the condensate collector are inside the casing and are not accessible for service in the operating mode.

The purpose of the invention is to provide ease of maintenance by ensuring accessibility to the water distribution collector and the condensate trap, as well as increasing efficiency and reliability.

This goal is achieved by the fact that in a vertical vapor-liquid heat exchanger, mainly a regenerative heater of a steam turbine plant, comprising a housing inside which is installed a vertical tube bundle fixed in the upper and lower tube plates, the distribution manifold and condenser collector and condensate collector are made in the form of a cylindrical annular chamber and are located at the top of the water distribution collector.

FIG. I shows heat transfer. Longitudinal section; in fig. 2 - section aa

The vertical vapor-liquid heat exchanger comprises a housing 1 with a steam supply pipe 2, inside which a vertical tube bundle 3 with partitions 4 is installed for guiding the movement of steam. Vertical pipe nook 3 is fixed in the upper and lower tube plates 5 and 6, respectively. In the lower part of case i there is a water distribution collector 7 with branch pipes 8 and 9 1 of the outlet and outlet

The cooling water and the condensate trap are made in the form of a cylindrical annular chamber 10 located in the upper part of the water distribution manifold 7. In the housing 1, along the perimeter above the lower tube plate 6, holes 11 are made to drain the condensate from the lower tube plate 6 to the condensate bin. On the condensate collector, made in the form of a cylindrical annular chamber 10, a nozzle 12 is installed for removal of non-condensable gases, a nozzle 13 for drainage and flushing, and a nozzle 14 for condensate removal. In the annular chamber 10 in front of the pipe 14 of the condensate drain installed visor 15.

Vertical and liquid-phase heat exchanger works as follows;

The steam entering the heat exchanger body 1 through the nipple 2 inlet is directed through partitions 4 to the vertical tube bundle 3, condenses, the condensate formed is drained down, washing the bottom tube plate 6, washing it off the surface n.:ia.M to form a moving from the center to the periphery, the flow enters through the opening 11 to drain the condensate into the cylindrical annular chamber 10. Next, the condensate, forming a level, is drained through the nozzle 14 of the condensate from the heat exchanger. The visor 15 serves to prevent steam from entering the condensate outlet 14 and allowing for large fluctuations in the level of condensate in the condensate collector. Non-condensable gases accumulate in the upper part of the annular chamber 10 and are removed through fitting 12. Drainage during flushing and other technological operations is carried out through fitting

 13 drainage and washing. Water is supplied through the pipe 8 of the water distribution collector 7 passes up and down through the vertical. I have a pipe bundle 3 and exits the heat exchanger through the pipe 9.

0The ratio of the external and internal diameters of the cylindrical annular chamber 10 is recommended to be constructively selected in ireda.1a-1.2-1.3, and the height of the level of condensate (h) in the box; the first chamber is determined from the condition of adjustment; is given the inequality. m

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| de q - the total consumption of condensate;

tfiep is the total time of operation of the regulator and the time for the transfer of a pulse from a level change;

D is the outer diameter of the annular chamber; ci is the inner diameter of the annular chamber.

D

Calculations show that with -j -1,2-1,3 the height of the level (h) of the condensate in the condensate collector does not exceed 1 m, which satisfies layout considerations m.

Thus, the proposed ESbino.uienne heat exchanger will improve serviceability by ensuring accessibility to the water distribution collector p Kondellasatos6o11N11ku as well as saving pn reliability due to providing a level of condensate below the cleared bottom tube plate.

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Claims (1)

VERTICAL STEAM-LIQUID HEAT EXCHANGER, mainly a regenerative heater of a steam turbine installation, comprising a casing inside of which there is a vertical tube bundle fixed in the upper and lower tube boards, a water distribution manifold and a condensate collector, different. the fact that, for the convenience of maintenance by ensuring accessibility to the water distribution manifold and the condensate collector, the condensate collector is made in the form of a cylindrical annular chamber and is located in the upper part of the water distribution manifold. φι / ί.ΐ SU „„ 1052782