RU178401U1 - Heat and mass transfer device - Google Patents

Abstract

The solution relates to contact devices designed to conduct heat and mass transfer processes in heterogeneous gas (vapor) - liquid systems. The most effective use of this device will be possible in the case of moderate thermal effects accompanying sorption and chemisorption processes. The proposed solution is to increase the ease of installation of the collector, improve the uniformity of fluid distribution over the elements and reduce the wall effect, increase the velocity of the coolant, as a result of which the heat transfer coefficient increases heat carrier. Technical result - improving the design of the collector, changing the location and the shape of the gas-liquid channels, improving the space for movement of the coolant. This technical result is achieved by the fact that in the heat and mass transfer device including the housing (shell), the collector for the removal and supply of coolant, plates and installed perforated corrugated heat-conducting elements, the channels have a radial arrangement. The plates are combined in pairs in heat exchange modules. The coolant is fed into the internal cavity of the modules. The space between the modules forms gas-liquid channels, in each of which perforated corrugated heat-conducting elements are installed, located around the circumference or radially. This allows you to improve the irrigation of the device, to reduce the uneven distribution of fluid over the cross section of the device. By changing the location of the collectors for the removal and supply of coolant (above and below the layer of the device), ease of installation and repair is achieved, as a convenient approach to connections from all sides is provided. Due to the installation of partitions in the channel for the coolant, its speed increases, and as a result, the heat transfer from it increases. In this case, the partitions are inclined.

Description

The solution relates to contact devices designed to conduct heat and mass transfer processes in heterogeneous gas (vapor) - liquid systems. The most efficient use of this device will be possible in the case of moderate thermal effects accompanying sorption and chemisorption processes.

A heat and mass transfer device [1] is known, including a housing, collectors for removing and supplying heat carrier to a channel formed by vertically mounted contact pairs of plates, adjacent pairs of plates form gas-liquid channels, each of which has perforated corrugated heat-conducting elements. Each contact pair of plates adjacent to it sections of gas-liquid channels separated from neighboring sections by heat-conducting elements, and fragments of collectors for the removal and supply of coolant, oedineny into blocks, fragments collectors between blocks sealingly interconnected, the heat-conducting elements are formed with longitudinal corrugations, and the contact plate - with longitudinal or oblique corrugations.

This device is the closest in technical essence and the achieved result is a prototype.

The device operates as follows. The coolant is supplied to the channels for the coolant formed by vertically mounted contact pairs of plates through the nozzle. Liquid is supplied to the device from above, gas is distributed in the channels from below. Phase contact occurs.

The heat and mass transfer device prototype is characterized by an uneven distribution of liquid across the plates (the extreme plates are worse irrigated, the degree of wetting is 30–50%), the inconvenience of mounting the collector, low turbulization of the coolant, and, accordingly, a low heat transfer coefficient.

The proposed solution poses the problem of improving the ease of installation of the collector, improving the uniformity of the distribution of fluid among the elements and reducing the near-wall effect, increasing the velocity of the coolant, as a result of increasing the heat transfer coefficient from the coolant.

The technical result - improving the design of the collector, changing the location and shape of the gas-liquid channels, improving the space for movement of the coolant.

This technical result is achieved by the fact that in the heat and mass transfer device including the housing (shell), the collector for the removal and supply of coolant, made in the form of annular pipes connected by means of fittings with channels for the coolant, plates and installed perforated corrugated heat-conducting elements, the channels have a radial location. The plates are installed along the radius of the shell and are combined in pairs in heat exchange modules. The coolant is fed into the internal cavity of the modules. The space between the modules forms gas-liquid channels, in each of which perforated corrugated heat-conducting elements are installed, located around the circumference or radially. This allows you to improve the irrigation of the device, to reduce the uneven distribution of fluid over the cross section of the device. By changing the location of the collectors for the removal and supply of coolant (above and below the layer of the device), ease of installation and repair is achieved, as a convenient approach to connections from all sides is provided. Due to the installation of partitions in the channel for the coolant, its speed increases, and as a result, the heat transfer from it increases. In this case, the partitions are inclined.

The proposed heat and mass transfer device is shown in the drawings: in FIG. 1 is a General sectional view; in FIG. 2 - top view; in FIG. 3 - shows a heat exchange module; in FIG. 4 - Volumetric model of the device.

In the description and in the drawings, the notation:

1 - housing

2 - heat exchange module (channel for supplying coolant),

3 - pipeline supply / removal of coolant,

4 - distribution manifold,

5 - gas-liquid channel

6 - mesh heat-conducting element,

7 - flange

8 - side wall of the module (plate),

9 - partitions.

The heat exchange device is installed in the housing 1, includes circular pipelines - a collector 4 for removal and supply of coolant. Through it, the coolant is fed into the channels 2 (Fig. 1). Pairs of contact plates 8 (side walls of the module), mounted vertically, form a channel 2 for supplying coolant, which enters and is discharged through pipe 3. Adjacent pairs of plates 8 form gas-liquid channels 5. A perforated corrugated heat-conducting element 6 with corrugations is installed in each gas-liquid channel 5 similar to that described in [1].

Each contact pair of plates 8, adjacent to it sections of gas-liquid channels 5, separated from neighboring sections by heat-conducting elements 6 and connected in blocks. On top and bottom of the module there are fittings that can be hermetically connected by flanges 7, a coupling, etc. Corrugations on the heat-conducting elements form tapering triangular channels on one side of the heat-conducting element 6, on the other side the channels alternate - they are narrowed, then expand, similarly [1]. The plates also have straight or inclined corrugations. Inside the channels for the coolant installed inclined partitions. Partitions are conventionally shown in FIG. 3. Partitions increase the velocity of the coolant, turbulence the flow, and therefore significantly intensify heat transfer from the coolant.

The heat-mass-exchange device is assembled by connecting the heat-exchange modules with a collector 4 in the node 7. Heat-conducting elements 6 are also installed between the modules.

The device operates as follows. The gas phase is supplied from above or below, distributed in gas-liquid channels 5. The liquid phase is fed from above (or from below), distributed over heat and mass transfer blocks and perforated corrugated elements 6. The phases contact on their surface, where the mass transfer process takes place. In channel 2, a coolant (water or steam) is supplied through the nozzle. Thus, on the surface of the modules (on the walls 8) there is also a heat exchange process. Heat-conducting elements are also involved in the heat exchange process. Possible work in flooded mode.

Corrugations on the heat-conducting elements and contact plates increase the contact surface. The implementation of the corrugations in the form of tapering triangular channels on one side, alternating on the other side provides good mixing of the liquid, its easy transition from the plates 8 to the heat-conducting elements 6 and vice versa.

 The radial arrangement of the modules forming the channels eliminates the effect of uneven wetting of the device, since there are no isolated wall zones with little irrigation with their liquid.

The installation of inlet and outlet pipelines in the upper and lower parts of the device increases the manufacturability and ease of maintenance due to the larger working space and the possibility of inspection from any direction.

Based on the foregoing, we can conclude that the proposed solution meets the criterion of "novelty." The authors are not aware of solutions with similar distinctive features, on the basis of which it can be concluded that the claimed solution meets the criterion of "inventive step". A prototype test confirmed the industrial applicability of the device.

1. Pat. RF Ru 141 498, cell B 01 D 3/28. Heat and mass transfer device / A.V. Stepykin, A.A. Sidyagin; applicant NSTU them. R.E. Alekseeva. - publ. Bul No. 16, 2014.

Claims (1)

Heat and mass transfer device, including a cylindrical body, collectors for the removal and supply of coolant into the channel formed by vertically mounted contact pairs of plates, adjacent pairs of plates form gas-liquid channels, in each of which perforated corrugated heat-conducting elements are installed, characterized in that the plates are installed radially along the radius of the shell , the channels for the coolant are made tapering and partitions are installed in them, the collector is located above and below the devices m and is made in the form of annular tubes connected by fittings with channels for a coolant.

Images