SU1478026A1 - Heat exchanger for contaminated media - Google Patents

Abstract

The invention relates to heat engineering and can be used to recover the heat of various polluted wastewater and natural flowing water. The purpose of the invention is to increase the operational reliability of the heat exchanger. Heat transfer elements (E) for the passage of one medium are placed in a channel for a polluted medium, fixed at one end in the wall of the flow channel and hang freely at the last other end. E are made of flexible material to provide oscillatory movement of their free-hanging ends under the action of a contaminated environment. Um. made in the form of a V-shaped tube, between the branches of which a sealed buffer cavity is filled, filled with a substance having a density different from the density of the medium flowing inside E. Ae. made of plastic compacted with metallic mineral or fabric inclusions. The free ends of E oscillate and vibrate under the action of flow, as a result of which the hydraulic resistance of the channel is reduced and the deposition of contaminants on the surface E is prevented. 2 Cpf, 16 sludge.

Description

The invention relates to heat engineering and can be used to recover the heat of various polluted wastewater and natural flowing water,

A heat exchanger for the contaminated medium is known, which contains heat exchanging elements for the passage of one medium placed in a channel for the contaminated medium and hangs freely at the other ends (USSR Authorship Certificate No. 866403, cl. F 28 D 7/06, 1980) .

The disadvantage of the known device

is a gradual decrease in the thermal conductivity of the walls of the elements due to their contamination, as well as a significant hydraulic resistance in the channel.

The purpose of the invention is to increase operational reliability.

1 shows a heat exchanger with heat exchange elements in the form of U-shaped tubes, a section; figure 2 - section aa in Fig .; FIG. 3 shows a heat exchanger with radially arranged in the channel of the polluted medium; heat J

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exchange elements, cut; figure 4 - section bb in fig.Z; in fig. 5- heat exchanger with heat exchange elements in the form of U-shaped tubes located radially in the channel of the polluted medium; section; figure 6 - section bb in fig.Z; figure 7 - heat exchanger with arcuate heat exchange elements, the cut; Fig.8 is a section of GGD in Fig.7; figure 9 is a heat exchanger with heat exchange elements having areas of free ends arranged parallel to the axis of the heat exchanger, a section; figure 10 is a section dD in figure 9; figure 11 is a heat exchanger with heat exchange elements located in the channel parallel to the axis of the heat exchanger, the section; in fig. 12 is a section E-E in FIG. FIG. 13 shows a heat exchanger with vertically arranged heat-exchange elements in the tank with flow-over contaminated elements}; Fig. 14 is a heat exchange element in the form of a U-tube with adjacent branches; Fig. 15 is the same, a deaf channel is located between the branches; on Fig - the same, with four channels.

The heat exchanger contains several heat exchange elements 1, which in turn contain channels 2 and 3 of flow for the flow and return lines of the coolant, as well as a sealed buffer cavity 4 with enclosed air, a protective tube 5 to prevent large bending stresses caused by the flow, connecting nozzles 6 for creating a connection between the channels 2 and 3 of the flow of the flow and return lines of the coolant and the ring channels 7 and 8 for the flow and return lines of the coolant, which are circulated to the retaining f lanz 9, as well as the corresponding bolted flange connections 10 for fastening the holding flange 9 in the flow channel 11 of the contaminated heat source environment. Heat exchange elements 1 with one free end and with attached at the other end branch pipes 6 are used mainly in the form of ribbon-like two-, three- or four-channel elements, made, for example, in the form of a U-shaped tube with adjoining branches or buffer cavity 4, and the selected element geometry should provide

0

five

0

five

0

35

40

45

50

65

Simapnuyu heat transfer area. It is possible to use centric or concentric channels. The arrangement of elements 1 in channel 11 may also be different.

Elements 1 are made of flexible material and have free-hanging ends that oscillate under the influence of a polluted medium. The material can be plastic, compacted, metal, mineral or fabric inclusions. Under critical operating conditions, distance clamps can be used, for example, in the form of cords or ropes.

During operation of the heat exchanger, coolant is supplied to the interior of the heat exchange elements 1 located in the flow channel 11 of the contaminated medium, which is heated through the wall of the element 1 and is discharged. Since the free ends of the elements 1 oscillate and vibrate under the action of the flow, the deposition of contaminants on the surface of the elements 1 is prevented. In addition, the flow resistance of the channel is reduced by moving the free ends in the direction of flow. The cleaning effect can be improved by changing the surface of the channels by briefly reducing or increasing the pressure in the coolant channels, which also helps to prevent the deposition of small particles of contamination between which there are significant adhesive forces that can develop large adhesion forces on the material of the heat exchanger elements. When using appropriate materials for heat exchanger elements 1, wide areas of application of the proposed device for heat recovery from aggressive and chemically contaminated heat transfer agents are possible.

Claims (1)

1. A heat exchanger for contaminated media containing heat exchanging elements for the passage of one medium, placed in a channel for a polluted medium, fixed at one end in the wall of the channel and freely hanging at the other end, characterized in FIG. 2 11 9 and and No -. fig.z  K V AI Fig.5 ZigM 8-8 FIG. 6 Fig.8 CHO CM About CO g - 4i I H | FIG. 13