RU2559105C1 - Steam-water heat exchanger - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: on surfaces of U-shaped tubes there are annular inserts fixed at an angle to horizon with a possibility of condensate removal from the surfaces of the U-shaped tubes between horizontal partition walls.

EFFECT: reduction of thickness of condensate film on lower parts of tubes of a heat exchange surface by the steam condensate flowing down from upper parts of U-shaped tubes.

5 dwg

Description

The invention relates to the field of power engineering and can be used in the design and modernization of steam-water heat exchangers.

A known system for collecting flowing down the surface of U-shaped tubes of condensate, which includes intermediate partitions on which there are sides, and its removal is carried out through the tubes of the tube bundle frame. To this end, the frame pipes have special windows at the level of their passage through intermediate partitions (Auxiliary equipment of thermal power plants. L.A. Richter, D.P. Elizarov, V.M. Lavygin. - M.: Energoatomizdat, 1987. - Pp. . 7).

The disadvantage of this system is the violation of heat transfer due to the condensate film on the U-shaped tubes.

It is known that thickening of the condensate film affects heat transfer. Therefore, the organization of the intermediate removal of steam condensate from U-shaped pipes of the heat exchange surface in order to reduce condensate flooding of the lower parts of the U-shaped pipes and to reduce the film thickness is a technical solution that increases the efficiency of the heat exchangers.

Closest to the proposed invention is a steam-water heat exchanger with a heating steam condensate collection system, which includes a housing with steam inlet and condensate outlet pipes, a distribution water chamber with heated water inlet and outlet pipes, a pipe system with vertical baffles, straight or U-shaped pipes of the heat exchange surface, while between the vertical partitions installed at an angle to the horizontal inclined partitions with condensate collectors in their lower parts thereof (Patent RU 2305227, IPC F22D 1/32, publication date of the patent: 08/27/2007).

The disadvantages of this system are the difficulty in the manufacture of the heater, since it is necessary to install partitions without damaging the U-shaped tubes of the tube bundle, as well as pouring the lower parts of the U-tubes from the upper parts with condensate, which worsens heat transfer due to an increase in the thickness of the flowing down with U- pipe-shaped heat exchange surface of the condensate film.

The objective of the invention is to increase the efficiency of the heat exchanger by increasing the heat transfer coefficient.

The technical result is a decrease in flooding, that is, a decrease in the thickness of the condensate film on the lower parts of the U-shaped pipes of the heat exchange surface by the flowing steam condensate from the upper parts of the U-shaped pipes.

The problem is solved, and the technical result is achieved by the fact that in the steam-water heat exchanger, which includes a housing with steam inlet and condensate outlet pipes, a distribution water chamber with heated water inlet and outlet pipes, a pipe system with vertical partitions, U-shaped pipes placed in the casing heat transfer surfaces, according to the invention, ring inserts are fixed on the surface of the U-shaped pipes at an angle to the horizontal with the possibility of condensate drainage from the surfaces of the U-shaped pipes between rizontalnymi partitions.

The invention is illustrated by drawings, in which Fig. 1 shows a longitudinal section of a steam-water heat exchanger, Fig. 2 is a front view, in Fig. 3 is a section A, in Fig. 4 is a view B, in Fig. 5 are pipes with ring inserts.

The steam-water heat exchanger includes the cover of the water chamber 1 (Fig. 1) with the compartments of the water chamber 2 and the upper tube plate 3, the pipe system 4, the casing 5 and the support legs 6 (Fig. 2), the air vent 7, the transport frames 8 (Fig. 3) , nozzles for the input of heating steam 9 and the main condensate 10, nozzles for the output of the main condensate 11 and condensate drain for heating steam 12, a nozzle for suctioning the steam-air mixture 13, a condensate level indicator for heating steam 14, a pipe for supplying drainage from another heater 15, a condensate level regulator 16, the return valve 17 (Fig. 4), bottom Yu tube plate 18, nozzle inlet vapor mixture from another heater 19, baffle plate 20, the valve sleeve 21 and the thermometer 22 and fixed to the surfaces of U-shaped tubes annular insert 23 (FIG. 5).

Steam-water heat exchanger operates as follows. Heating condensate enters the first compartment of the water chamber 2 through the inlet of the main condensate 10. From the first stage it enters the brass U-shaped tubes 4 embedded in the tube plate 3. Flowing inside the brass U-shaped tubes and heated in them, the condensate enters the second compartment of the water chamber 2. Condensate is heated by the heat of condensation of the heating steam, which condenses on the outer surfaces of these U-shaped tubes.

Heated condensate is discharged from the apparatus through a pipe 11 connected to the last of the chamber compartments.

The heating steam enters the heater body through the nozzle 9. The protective sheet 20 protects the pipe system from the dynamic effects of the steam jet and contributes to a more even flow separation among the housings. To ensure the required number of steam strokes in the housing, a horizontal partition is used.

As a result of condensation, condensation forms on the cold surfaces of the U-shaped tubes, which is removed from the surfaces of the U-shaped tubes by means of ring inserts 23 and accumulates in the lower part of the apparatus.

So, the claimed invention allows to solve the problem by reducing the thickness of the condensate film on the lower parts of the U-shaped pipes of the heat exchange surfaces of the falling condensate of steam from the upper parts of the U-shaped pipes using ring inserts located at an angle to the horizontal.

Claims (1)

Steam-water heat exchanger, comprising a housing with steam inlet and outlet condensate nozzles, a distribution water chamber with heated water inlet and outlet nozzles, a pipe system with vertical partitions, U-shaped tubes of heat exchange surfaces, located in the casing, characterized in that on the surfaces of U-shaped the pipes are fixed ring inserts at an angle to the horizontal with the ability to drain condensate from the surfaces of the U-shaped pipes between the horizontal partitions.

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