The heat exchanger

 

(57) Abstract:

Usage: the invention relates to heat exchange devices used in membrane technology for temperature control of mediums and products of membrane separation and apparatus alcohol production for carrying out processes of condensation in systems containing gases. The inventive fluid through pipe 6 is fed into the housing 1, into which it flows initially through the upper channel between the shells 2 and 3 to 4 partitions with greater speed, then the pipe 5 he enters the bottom of the channel, in which the speed reduction is compensated by the increase in the rate of heating surface, and then discharged through the outlet 7. From the outer surface of the pipes heat is removed by natural convection of the liquid in the tank volume of the source water of the membrane installation. When using the heat exchanger as a condenser in the channels of the heat exchanger is fed coolant, and steam is applied to the external surface of the heat exchanger from below, when communicating with cooled walls 2 and 3, it condenses and flows down in the form of liquid films. When additional shell, the liquid stream is broken and it drains ‡ crystals, 7 Il.

The invention relates to heat exchange devices used in membrane technology for temperature control of mediums and products of membrane separation and apparatus alcohol production for carrying out processes of condensation in systems containing gases.

Known spiral heat exchanger containing tiered placed section of the cylindrical tubular spirals connected to the distributing and collecting manifolds, adjacent turns of the spirals of each section are arranged with a gap to each other, and the input and output sections of the coils are placed between the coils of the latter around with their inner and outer sides. (See for example, ed.St. USSR N 1758380, CL 5F 28D 1/047,F 28F 21/06).

The drawbacks of such devices and generally spiral heat exchangers are:

increased consumption due to insufficient efficiency of heat transfer: areas of the outer surface of the spiral heat exchanger located in the interturn space and in the upper part of the heat exchanger due to the smaller temperature difference in the interaction with the environment provides less heat loss:

the difficulty of cleaning the surface from contaminants and sediments obuslovlennogo, couplers, etc.

increased consumption and therefore increased complexity of manufacturing and cost.

Disadvantages described above of the heat exchanger is partially removed in a heat exchanger containing a plate with tubular channels for the passage of one of the environments, rolled into a spiral with the formation of selewach channels for different environment, with each plate consists of flat areas located on adjacent angle (see, for example, ABT.St. USSR N 504917, CL 2F28 D9/04).

This device allows you to use instead of seamless tubes of sheet material, to increase the efficiency of heat transfer, however, it has the following disadvantages:

insufficient efficiency of heat transfer in heat in statics and cooling, because such a device can only work when forced circulation environment:

the difficulty of cleaning the heating surfaces from dirt and deposits due to poor access.

In terms of total characteristics as the prototype device is selected on the author's certificate USSR N 504917).

The task of the invention is to reduce material consumption, simplifying maintenance and reducing the Tr is Rasem case, made of plates with tubular channels in the form of ridges for passage of one of the environments connected with conductive and discharge pipes, plates bent with the formation of cylindrical shells with opposite ridges and installed coaxially one within the other with the creation of between torroidalnom channels of different diameters, provided with transverse partitions, the upper and lower edges of the shells have flanging, and facing towards each other, the ridges made on the depth of the flanging and are connected with the formation of bridges between the channels connecting pipe, and a partition installed between and connecting the inlet and outlet pipes, on the outer surface of the forming channels ridge installed additional shells, connected tangentially at their upper edges.

Execution of curved plates with the formation of cylindrical shells with opposite ridges and mounted coaxially one within the other with the creation of between torroidalnom channels of different diameters, provided with transverse partitions, provides for the establishment of annular heat exchanger with less metal per unit taleem pressure without additional devices such as brackets or braces, providing the fixation elements of the heat exchanger, in addition, the heating surfaces are easily accessible for cleaning from the sediments. For production of such a heat exchanger does not require complex tooling types of stamps, which reduces the complexity and cost of manufacture. Perform upper and lower forming channels in the shape of a torus of ridges with different diameters provides giving a radial cross section of the heat exchanger triangular, with the apex of the triangle directed in the direction of the external environment: when the heat exchanger as a heater, is installed, for example in the capacity of the processing environment of the membrane installation, the heat exchanger is deployed in a position in which a smaller torus is large, than is achieved by intensive washing of the heating surface by convective flows. The presence of partitions provides the organization coolant flow in the annular channel so that both channels, in spite of different diameters, are characterized by high heat transfer: with a smaller diameter of the upper channel flow velocity, and hence the heat dissipation per unit area is higher. This is achieved by improving the efficiency of the heat exchanger when the reduction is ECU to each other of the ridges on the depth of the flanging and connect them together with the formation of jumper prevents the flow of fluid from the upper annular channel in the bottom and to facilitate Assembly of the heat exchanger: it is enough to push into the outer shell of the inner and connect the upper and lower edges by welding.

Running between the channels of the connecting pipe, and installation of partitions on the areas between the connecting, inlet and outlet nozzles provides the best organization of flows and therefore, the maximum use of the entire heat exchange surface.

Installation on the outer surface of the forming channels of the ridge for more shells, connected tangentially at their upper edges, provides the heat exchanger in the mode of the capacitor due to the rupture of the film condensed on the outer surface of the liquid. When the reduction of the average film thickness is improved thermodynamic characteristics of the heat exchanger, increasing its productivity and reduced consumption.

In Fig. 1 shows a heat exchanger to heat the fluid (General view); Fig. 2 is top view of Fig. 3 section a-a of Fig. 4 - heat exchanger operating as a condenser (top view), and Fig. 5 - General view of the capacitor in the context of Fig. 6 section B-b and Fig. 7 is a cross section along B-B.

The heat exchanger includes a housing 1 consisting of two cylindrical shells 2 and 3, the shell 2 is installed inside the shell 3 and the upper and lower edges tightly soedel, facing the concavity of the inner shell 2 to the outside, and the outer inside and after welding, forming two annular channel, blocked by a transverse partition 4. In addition, the shells 2 and 3 are also the ridges parallel to the generatrix of the shell, which after Assembly to form a pipe 5 connecting the upper and lower annular channels between them. The upper channel is supplied by a pipe 6 coolant, and the lower channel pipe 7 drain the coolant. Lots of shells between the upper and lower ridges provided with a ridge, directional concavity in the opposite relative to the forming channels to the ridge side, and the depth of the ridge corresponds to the diameter of the edges of the shells.

When the operation of the condenser heat exchanger is installed in a position in which the top is the channel with a larger diameter and all channels are equipped with a downward-additional shells 8 connected to the outer surface forming the channels of the ridge at a tangent.

The proposed device operates as follows.

Coolant through the young man 6 is fed into the housing 1, into which it flows initially through the upper channel between the shells 2 and 3 to partition 4 more scoresm speed of heating surface, and then discharged through the outlet 7. From the outer surface of the pipes heat is removed by natural convection of the liquid in the tank volume of the source water membrane installation, conventionally in the drawing are not shown.

When using the heat exchanger as a condenser in the channels of the heat exchanger is fed coolant, and steam is applied to the external surface of the heat exchanger from below, when communicating with cooled walls 2 and 3, it condenses and flows down in the form of liquid films. When additional shell 8, the fluid flow is broken and it flows down, thereby releasing the sections of the outer wall of the heat exchanger to communicate with a steam environment.

The use of the proposed device allows you to simultaneously increase the proportion of the contact surface of the heat exchanger communicating with the heated environment, provides the best organization of convective flows.

Heat exchanger element is characterized by high operational reliability, as is usually the case at low pressure drops, and the configuration of the channels ensures good mixing of the coolant due to the centrifugal forces and the change of direction on what the process operation.

The use of the invention allows to increase the operational reliability, reduce the consumption of materials to simplify maintenance.

1. A heat exchanger comprising a housing, made of plates with tubular channels in the form of a ridge for the passage of one of the environments connected with inlet and outlet nozzles, characterized in that the plate is curved with the formation of cylindrical shells with opposite ridges and installed coaxially one inside the other to create between them a toroidal channels of different diameters, provided with transverse partitions.

2. The heat exchanger under item 1, characterized in that the upper and lower edges of the shells have flanging, and facing towards each other, the ridge is made on the depth of the flanging and are connected with the formation of bridges.

3. The heat exchanger under item 1, characterized in that between the channels connecting pipe, and a partition installed between and connecting the inlet and outlet pipes.

4. The heat exchanger under item 1, characterized in that on the outer surface of the forming channels ridge installed additional shells, connected by their upper tangent

 

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