CS222868B1 - Tubular heat exchanger tube heat exchanger - Google Patents

Abstract

The invention relates to a tubular heat exchanger and solves the problem of intensifying heat transfer and preventing the formation of incrustations during heat transfer between two media that must be separated from each other by a solid wall. The essence of the invention is that the inlet and outlet for the incrustation medium are arranged tangentially to the chambers at both ends of the exchanger and to enhance the pre-rotation effect, a conical deflector is arranged in both chambers, i.e. in both the inlet and outlet chambers. The incrustation heat transfer medium enters the distribution chamber of the tubular heat exchanger through a tangential inlet of rectangular cross-section, in which it is divided into individual tubes and flows through them along helical paths with high velocity gradients at the wall, while the second, non-incrustation medium, e.g. condensing steam, flows in the inter-ring space of the heat exchanger.

Description

222868

BACKGROUND OF THE INVENTION The present invention relates to a tube heat exchanger in which the heat transfer medium is brought into intensive rotational motion on the side of the heat transfer medium with the risk of formation of sediments, because of the necessity of intensifying the heat transfer.

It is known that in a whole series of cases technical]! practice it is necessary to heat, respectively. cool down inlay media. There are rarely cases where heat transfer intensification is also required.

For the intensification of the heat transfer, there are known methods and devices with a helical flow of a heat transfer medium using a spit grout to develop this flow, or to modify the surface of the walls, for example by helical grooving. Such devices are proven to be useful in those cases where the heat transfer medium does not form encrustations. There are also tube-type heat exchangers with a screw-in installation. They are also known to be converted with rotating construction.

A disadvantage of these tunings is the large pressure drop resulting from the insertion of various shapes, laborious, but in general impossible to clean the heat transfer plates when used, for example in the environment of the incrustation surfaces and their high cost in economic terms.

An example of a device for exchanging heat, optionally between a gaseous or a vapor phase and a liquid according to CSSR Pat. No. 118,428 with a helical flow of the contacting phases is suitable for cases where immediate contact of the phases of the specific density is required, e.g. in absorption, rectification and similar properties of the apparatus according to CSSR-AO number 163 897a no. as well as analogous US-pat. No. 4,009,751 and VB Pat. 1 461 920.

In the case of heating or cooling, the incrustation media is known as CSSR-LO No. 187 684, in which the solid-state media is separated by a solid wall. The medium at risk of forming growth is brought into intense helical motion by its tangentially-arranged inlet and exit to and out of the honey-circle area. In practice, heat exchangers of this type have proven to be good for thermal power up to 105 kW, especially for inorganic media such as medicinal mineral water, geothermal water, mineral salt solutions, suspensions and under. Increasing the heat output of the heat exchanger of this type encounters problems of design and construction in that the increase in the radius of curvature of the channel of the intermediate ring reduces the heat transfer coefficient and increases the risk of increment formation. The parallel interconnection of exchanges of smaller capacities encounters practical and conceptual problems.

The above-mentioned drawbacks are overcome by the solution of the invention, which deals with problems of intensification of heat transfer and prevention of incrustation formation with heat transfer by two media, which must be separated from each other by a solid wall. The heat exchanger consists of a jacket, pipes, an inlet outlet chamber, an inlet and an outlet for heating or cooling. the cooling medium and its essence is that the inlet and outlet for the incrustation medium is arranged tangentially to the co-morals and a conical deflector is located in the respective chambers to enhance the drilling effect.

By bringing the heat transfer medium into a rotational motion, the maximum speed shift towards the tube wall is achieved. This results in a high gradient of velocity in the affinity area, which in turn favors the lens of the heat transfer coefficient but also suppresses the formation of deposits, respectively. incrusts.

The device according to the invention operates in such a way that the incrusting heat transfer medium enters the tangential inlet of the rectangular cross section into the distribution chamber of the tubular heat exchanger, in which it is divided into individual tubes and flows through them with high velocity wall velocities. while the second, non-crusting medium, e.g. condensing steam, superheated steam, water, high temperature heated medium flows in the inter-circular space of the heat exchanger. A deflector of conical shape is placed in the inlet and outlet chambers to enhance the effect of pre-rotating the fluid entering the chamber into individual tubes.

The solution according to the invention has achieved not only a substantial reduction of the heat exchanger dimensions against the conventional transfer, i.e. a tubular exchanger without the helical flow of the incrustation medium, but also by using the porous principle a new property has been achieved, namely the suppression of the incrustation formation on the heating flat.

In the accompanying drawing, Fig. 1 is a partial cross-sectional view of a device according to the invention.

FIG. 2 shows, in side elevation, a tangential entry into the chamber in a partial section.

FIG. 3 shows section A-A of the tube. The heat exchanger, as shown in the attached drawing, consists of a shell 1, a shell 2, an inlet chamber 3 and an outlet chamber 4 arranged on opposite exchanger ends. Further, from the inlet 5 and the outlet 6 of the incrustation medium, which are arranged in the chambers 3, 4 in a tangential manner. the coolant is an exchanger provided with an inlet and outlet neck 7, 8.

To heat the healing mineral water oi

flow of 14 kg. s1 from a starting temperature of 24 ° C to the desired outlet temperature of 40 ° C was

Claims (1)

jThe helical convection heat exchanger of a heat transfer medium, consisting of a shell, a tube, an inlet; and an outlet chamber arranged at opposite ends of the housing from the inlet and outlet ports for the inlet and outlet of the heating medium, characterized in that the inlet (5) and the outlet (6) for the incremental medium are arranged tangentially relative to the chambers (3, 4). in the chambers, a conical deflector (9) is provided to enhance the pre-rotation effect. 1 sheet of drawings