RU2355970C2 - Heat exchanger with heat u-like pipes - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention is designed for heat exchange and can be used in different industry branches. A heat exchanger comprises a lower casing part with the fittings for supplying and removing the heating medium and an upper casing part with the fittings for supplying and removing the medium being heated, upper and lower parts of the heat pipes fixed in the upper and lower pipe plates respectively with a common heat pipe chamber being formed between the plates. The heat exchanger is equipped with a pressure-and-vacuum gage and a gate set prior to it. The common heat pipe chamber is communicated to the gate connected to the vacuum air suction system. The heat pipes are of U-like shape.

EFFECT: control of pressure in the heat pipes, elimination of dryout in the evaporator and protection from the media mixing.

1 dwg

Description

The invention relates to heat exchange equipment and can be used in the energy, gas, metallurgical, chemical and food industries.

A heat exchanger is known, comprising a housing with heat pipes fixed in a tube plate, dividing the housing into two channels for flows of hot and cold media (see, for example, V.K. Zaripov, A.N. Gerduni. A highly efficient compact heat exchanger-heat exchanger on heat pipes. - Industrial Energy, No. 1, 1989, pp. 37-39).

A heat exchanger is known, in the tube plate of which contains a common chamber of heat pipes (see RU 2013746, F28D 15/02).

The disadvantages of such heat exchangers are:

- the possibility of a heat transfer crisis in the evaporator at high radial heat fluxes and blocking of the channel that impedes the normal operation of the pipe;

- the lack of regulation of pressure in the heat pipes and the suction of non-condensable gases;

- lack of protection against mixing heating and heated media in case of depressurization of the connection heat pipes - a common chamber.

The proposed heat exchanger eliminates these disadvantages. The drawing shows a longitudinal section of the proposed heat exchanger:

1 - the lower part of the housing;

2 - pipe for supplying a heating medium;

3 - pipe outlet heating medium;

4 - the lower part of the U-shaped heat pipes;

5 - lower tube plate;

6 - fins;

7 - the upper part of the body;

8 - pipe for supplying a heated medium;

9 - pipe outlet of the heated medium;

10 - the upper part of the U-shaped heat pipes;

11 - upper tube plate;

12 - a common chamber of heat pipes;

13 - hole in the upper tube plate;

14 - hole in the flange;

15 - tube;

16 - control valve;

17 - suction system;

18 - manovacuum meter;

19 - valve;

20 - flanges.

The heat exchanger with thermal U-shaped pipes contains the lower part of the housing 1 with the inlet 2 and outlet 3 of the heating medium, the lower part of the U-shaped heat pipes 4 with an intermediate heat carrier, mounted in the lower tube plate 5 with mounted fins 6. On the lower part of the housing 1, the upper part of the housing 7 with the inlet 8 and outlet 9 of the heated medium containing the upper part of the finned heat pipes 10, mounted in the upper tube plate 11 with mounted fins 6, is installed, similar to the lower part rpusa. A common chamber of heat pipes 12 is formed between the lower 5 and upper 11 tube boards. Each half of the heat exchanger can be made of a different material according to the physicochemical properties of the media.

From the common chamber 12 of the heat pipes through the openings 13 and 14, the tube 15 and the control valve 16, air is aspirated before the heat exchanger starts to work using the suction system 17.

Using a manovacuum meter 18, pressure in the heat pipes is monitored. To turn off the vacuum gauge, valve 19 is installed.

The lower part of the housing 1 is connected to the upper part of the housing 7 by means of flanges 20.

If the heated (cooling) medium is ambient air, then the upper part of the housing 7, except for the clamping flange 20, is not installed, and the edges of the fins 6 are oriented at an angle to the horizontal.

The heat exchanger operates as follows. During the installation period, before installing the upper part of the housing 7 on the lower part of the housing 1, an intermediate heat transfer medium is poured into the lower part of the U-shaped heat pipes 4. After the final assembly of the heat exchanger, i.e. installing the upper part of the housing 7 on the lower part of the housing 1, opening the valves 16 and 19, we connect the unfilled system of heat pipes with a vacuum system, suck the air, then with the valve 16 we disconnect from the vacuum system, closing it. The valve 19 in front of the vacuum gauge is open to determine the pressure in the heat pipes. The heating medium enters the lower part of the housing 1 through the inlet pipe 2, gives off heat to the intermediate heat carrier and leaves through the outlet pipe 3. At the same time, the intermediate heat medium boils, and its vapor rises to the upper part of the heat pipes 10, where it gives off heat to the heated (cooling) medium, condense, the condensate of the intermediate coolant flows into the lower part of the heat pipes 4 and the process is repeated. The condensation heat of the vapors of the intermediate coolant is perceived by the heated (cooling) medium, which enters through the inlet pipe 8 of the upper part of the housing 7, washes the heat exchange surface and leaves the heat exchanger through the outlet pipe 9.

The implementation of heat pipes in the form of U-shaped eliminates the possibility of a heat transfer crisis in the evaporator at high radial heat fluxes and blocking the channel, because local circulation circuits are formed in the U-shaped tubes.

The pressure control system in the heat pipes, consisting of a control valve 16, a manovacuum meter 17 and valve 19 allows you to control the pressure in the heat pipes, to suck out non-condensable gases, and also by periodically taking steam samples through valve 19 from the common chamber 12 makes it possible to detect the penetration of heating or heated medium into a common chamber 12 (in case of depressurization of the connection, heat pipes - a common chamber), which allows to prevent mixing of media in advance and to avoid technological and environmental problems. cal problems, for example, in oil coolers - oil from entering into the water discharged into the reservoir, and others.

Claims (1)

A heat exchanger with heat pipes, comprising a lower part of the body with nozzles for supplying and discharging a heating medium and an upper part of the body with nozzles for supplying and discharging a heated medium, upper and lower parts of heat pipes fixed respectively in the upper and lower tube boards, between which a common heat chamber is formed pipes, characterized in that it is equipped with a manovacuum meter and a valve installed in front of it, the common chamber of the heat pipes in communication with a valve connected to a vacuum air suction system, and heat pipes We are made U-shaped.