RU2705787C1 - Air cooling device - Google Patents

Abstract

FIELD: heat exchange.

SUBSTANCE: invention relates to air cooling apparatus for conducting heat exchange processes between air and hot heat carrier using movable channels (rotating tubes) and can be used in gas, chemical and oil refining industry. Apparatus consists of a casing, a staggered bundle of tubes, spiral tapes, bladed impellers with outer rings, closed type bearings, a confuser and a diffuser for air inlet and outlet, tube grids, nozzles for hot heat carrier inlet and outlet. Spiral tape is rigidly installed in each pipe. On the surface of each pipe at equal distance between each other, bladed impellers with outer rings are installed, at that, impellers on each pipe are located with displacement relative to impellers on pipes of adjacent horizontal rows so that they do not touch each other during rotation; bearings are located in tube plates.

EFFECT: increased intensity of heat exchange processes; reduced costs of metal for making the apparatus; reduced power consumption.

1 cl, 4 dwg

Description

The invention relates to air cooling apparatus for conducting heat exchange processes between a heat carrier and air using movable channels (rotating pipes) and can be used in the gas, chemical and oil refining industries.

The RF patent for invention No. 2266494 describes an air-cooling apparatus comprising fans for supplying an external cooling medium, mainly air, to the apparatus body and at least two heat-exchange sections with chilled gas inlet and outlet chambers. Single-pass finned heat-exchange tubes located in sections in rows along its height and forming a bundle are embedded in tube boards. Each inlet chamber and outlet chamber have from two to seven nozzles for connection to the gas supply or exhaust manifold, which are in communication with the gas pipeline. The total cross-sectional area of the group of heat transfer tubes of the beam communicated by the flow of the cooled gas predominantly with the supply pipe closest to them is 1.2-1.7 times larger than the cross-sectional area of this pipe in the region where the gas is adjacent to the gas inlet chamber of the apparatus.

Common features with the proposed design of the heat exchanger are the presence of a tube bundle, the presence of a tube sheet, and also cooling of the hot heat carrier with air.

The disadvantage of this invention is the presence of a fan designed to supply air to the apparatus, which consumes a large amount of electricity, insufficiently high heat transfer intensity, as well as high material consumption.

The air cooling apparatus described in the patent of the Russian Federation for invention No. 2617668 is equipped with horizontally arranged heat-exchange sections, tube boards with openings, inlet and outlet chambers of the heat carrier, an axial electric fan, a diffuser. A distinctive design feature is the presence of three deflectors of two types in the diffuser: an S-shaped deflector for the center of the heat exchanger and two blade deflectors for the peripheral part of the heat exchanger.

Common features with the proposed design of the air-cooling apparatus are the presence of a tube bundle, a diffuser, inlet and outlet chambers of the coolant, as well as cooling of the coolant with air.

The disadvantage is similar to the previous analogue.

The RF patent for invention No. 2518708 describes an air-cooling apparatus in which the gas to be cooled is supplied to the heat exchange tubes of the heat exchange section. Additionally, the cooled coolant of the second circuit (fuel gas, etc.) enters the internal pipes located in the cavity of the heat exchange pipes. Due to the heat exchange of the gas to be cooled with the coolant of the second circuit, additional cooling of the gas after the compressor station and the heating of the coolant of the second circuit occur. The technical result is an increase in thermal efficiency by reducing energy consumption.

Common features with the proposed design of the air-cooling apparatus are the presence of a tube bundle, inlet and outlet chambers of the coolant, as well as cooling of the coolant with air.

The disadvantage is similar to the previous analogue.

The closest in design (prototype) is the heat exchanger described in RF patent No. 2645861 "Tube-in-pipe heat exchanger with a rotating pipe", which consists of two concentric pipes: an inner pipe and an outer pipe, a radial turbine, an axial turbine, a turbulator in in the form of a spiral tape, two bearings, seals and nozzles for the inlet and outlet of a high-speed coolant. A radial turbine is mounted on the inner pipe and mounted on it with an interference fit. A radial turbine is located opposite the nozzle for the entrance of a high-speed coolant. An axial turbine is tightened into the inner pipe.

Common features with the proposed design of the heat exchanger are the presence of pipes, spiral tape, bearings, seals and the ability of the pipes to rotate.

The disadvantage of this invention is the low heat transfer rate.

The objective of the invention is the creation of a new highly efficient air cooling apparatus for conducting heat transfer processes between the hot heat carrier and air.

The technical result of the invention is:

- increasing the intensity of heat transfer processes;

- reducing material consumption;

- reducing energy costs.

The elimination of these drawbacks and the achievement of the claimed technical result from the implementation of a new air-cooling apparatus is achieved due to the fact that a chess tube bundle is mounted on bearings inside the casing, a spiral tape is rigidly attached to the inner wall of each pipe, which ensures the swirl of the hot coolant and rotation of each pipe for the energy of the hot coolant, and the movement of air through the annulus and mixing of the air is provided using paddle impellers with outer rings rigidly fixed to the outer wall of each rotating pipe at the same distance between each other, while the impellers on each pipe are offset with respect to the impellers on the pipes of adjacent horizontal rows, while the hot heat carrier leads to a spiral tape located in each pipe, together with the pipe, in rotation, while the bladed impellers with the outer rings rotate together with the pipe, which allows air to be transported through the annulus of the apparatus, increasing there is turbulence of the hot heat carrier and air and the intensity of heat transfer between the hot heat carrier flow and the air stream, refuse to use a fan and reduce energy costs, increase the frequency of rotation of pipes, and, as a result, reduce the required volume of the apparatus, as well as reduce the material consumption of the apparatus.

Common signs with the prototype are the presence of a casing, pipes, nozzles for entering and exiting the hot coolant, a turbulizer in the form of a spiral tape, blade elements on the pipes, bearings.

A distinctive feature of the claimed invention is the location of the spiral tape inside the rotating inner tubes forming a chessboard placed in the casing, and the presence of vane impellers with outer rings rigidly fixed to the outer wall of each rotating tube at the same distance from each other, while the vane impellers on each tube arranged with offset relative to the impellers on the pipes of adjacent horizontal rows, as well as a rigid connection with the casing of the confuser and diffuser, bearing iki, located in the tube sheets. In this case, the flow of hot coolant entering the pipes rotates the spiral tape in each pipe and each pipe, while the bladed impellers with the outer rings rotate together with the pipes, while the bladed impellers with the outer rings move the air in the annulus of the apparatus. Spiral tapes in pipes and vane impellers with outer rings also play the role of fins and increase the area of heat transfer and the intensity of heat transfer. Spiral tapes also play the role of swirls of the flow of hot coolant, when passing through which the hot coolant acquires a rotational direction of motion. Bladed impellers with outer rings also play the role of a swirl of air flow. The rotation of the pipes causes the formation of turbulence both in the hot heat carrier passing through the pipes and in the air passing in the annulus, which leads to the intensification of heat transfer through the pipe wall from the hot heat carrier to the air. Closed bearings are located on the pipes in the holes of the tube sheets. The tightness of the junction of the rotating pipes with the tube sheet is ensured by closed bearings. Thus, the kinetic energy of the hot coolant is used to rotate spiral tapes, as well as pipes with impellers with outer rings attached to them from the outside, to turbulize flows in pipes and in the annulus, which allows to increase the intensity of heat transfer processes and reduce the cost of metal for the manufacture of the apparatus, at the same time, energy costs are reduced due to the rejection of the use of a fan.

The essence of the proposed apparatus of air cooling is illustrated by drawings (Fig. 1-3). List of figures:

FIG. 1. General view of the air cooling apparatus.

FIG. 2. General view of the impeller with the outer ring.

FIG. 3. Cross section AA pipe bundle.

FIG. 4. General view of the spiral tape.

In FIG. 1 shows a General view of the inventive apparatus of air cooling. In FIG. Figure 2 shows a general view of a blade impeller with an outer ring. In FIG. 3 shows a cross section AA of a tube bundle. In FIG. 4 shows a General view of a spiral tape.

The inventive air-cooling apparatus (Fig. 1-4) consists of a casing (1) (Fig. 1), heat transfer tubes (2) placed inside the casing (1) in the form of a chess bundle (Fig. 3), a spiral tape (3) (Fig. 4), impellers with an outer ring (4) (Fig. 2), sealed bearings (5), a confuser for air inlet (6), a diffuser for air outlet (7), a tube sheet (8), a pipe for entering the hot fluid (9), a nozzle for the exit of the hot fluid (10). The spiral tape (3) is installed in the inner pipe (2) and is rigidly fixed inside it. The impellers with outer rings (4) are rigidly mounted on the pipes (2) with the same distance between each other, while the impellers on each pipe are offset with respect to the impellers on the pipes of adjacent horizontal rows so that the impellers on adjacent horizontal rows rotate did not touch each other. The outer ring on the impeller (4) gives the air flow direction along the axis of the pipe (2). The inner tubes (2) lie on the sealed bearings (5). Closed bearings (5) are located in tube sheets (8). The tightness of the junction of the rotating inner pipes (2) with the fixed tube sheet (8) is ensured by closed-type bearings (5) (Fig. 1).

The proposed apparatus of air cooling, designed to cool the hot heat carrier air, works as follows. Hot coolant through a stationary inlet pipe (9) enters through a tube sheet (8) into pipes (2) containing spiral tapes (3). The flow of hot fluid interacts with each spiral tape (3), brings it into rotation together with a pipe (2) mounted on closed-type bearings (5) (Fig. 1). Each inner tube (2) and spiral tape (3), rigidly attached to it, rotate as a unit, with the same frequency and direction of rotation. The spiral tape (3), attached rigidly to the walls of the pipe (2), turbulizes the flow of hot coolant, which leads to an increase in the intensity of heat transfer.

Together with the pipe (2), the impellers rotate with the outer rings (4) (Fig. 2), mounted rigidly on the pipe (2). They move air in the annulus along the pipes. The outer ring on the impeller (4) gives the air flow direction along the axis of the pipe (2). In this case, the impellers (4) mix the air in the annulus. Bladed impellers with outer rings (4) also play the role of fins, which increases the heat transfer area. The kinetic energy of the hot coolant is used to rotate the spiral tape (3) and the pipe (2) with bladed impellers with outer rings (4), to turbulize the coolant flows, which makes it possible to intensify the heat transfer process. Heat transfer between the hot heat carrier and air occurs through the wall of the inner pipe (2). Hot coolant exits the pipe space through a stationary outlet pipe (10). Air enters the annulus through the stationary confuser (6), passes through the annulus and exits through the stationary diffuser (7). Closed-type bearings (5) serve as supports for pipes (2) and are also intended for sealing the joints of pipes (2) and fixed tube sheets (8). Thus, the kinetic energy of the hot fluid is used to rotate pipes (2) with impellers with rings (4) using spiral ribbons (3), to turbulize flows in the annulus and in the pipes (2), which makes it possible to intensify heat transfer and reduce material consumption apparatus and refuse to use a fan and electricity to supply air.

LITERATURE

1. RF patent for the invention No. 2266494. Gas air cooler. Ovchar V.G., Danilenko V.G., Belousov V.P., Berestov V.A., Terekhov V.M., Shlyakhov SB. Published: 12/20/2005.

2. RF patent for the invention No. 2617668. Gas air cooler. Zaripov Yu.M., Naumov A.M., Shishkin E.S., Cherny A.P. Publ. 04/27/2017.

3. RF patent for the invention No. 2518708. Gas air cooler. Korneev SI., Shurukhin I.N., Shabanov K.Yu., Pozdnyakova M.N. Publ. 06/10/2014.

4. RF patent for the invention No. 2645861. Pipe-in-pipe heat exchanger with a rotating pipe. Balchugov A.V., Kustov B.O., Badenikov A.V., Kuznetsov K.A., Kuzora I.E. Priority of the invention of April 26, 2017

Claims (1)

Air cooling apparatus, consisting of a casing with air inlet and outlet, pipes with nozzles for entering and exiting a hot coolant, with a turbulator in the form of a spiral tape, lobed elements on the outside of the pipes, bearings, characterized in that the casing is mounted on the bearings inside the casing a bunch of pipes, inside which spiral tapes are rigidly mounted, and on the outer surface of the pipes, the impellers with the outer rings are rigidly mounted at the same distance between themselves, while the impellers are each of the pipe are displaced relative to the impellers on the pipes of adjacent horizontal rows so that they do not touch each other during rotation, and the bearings on which the pipes lie lie in the tube sheets.

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