SU1746139A1 - Recuperator - Google Patents

Description

The invention relates to heat exchangers and can be used to heat the air necessary for burning fuel due to the heat of the exhaust flue gases from industrial heating and heat-treating furnaces.

A heat exchanger is known that contains an air duct with a flat heat transfer wall and a longitudinal perforated partition parallel to the last one that is parallel to the last collector and collector.

The closest to the invention to the technical essence and the achieved result is a recuperator containing an air duct connected to the collecting and distributing collectors with a flat heat transfer wall divided by transverse partitions into sections communicated with each other and provided with longitudinal partitions arranged in parallel heat transfer wall 2. A disadvantage of the known heat exchanger is the low efficiency of heat exchange due to the presence of transitions between sections for air flow from one section to another and non-participation of the sections of heat transfer wall in the jet heat exchange with air corresponding to these transitions. In addition, in each section, there is a simultaneous jet motion of unheated air flowing onto the heat transfer wall and the flow of heated air along the latter, which has a pulling effect on the jets of unheated air, preventing their perpendicular leakage to the wall. It also reduces the intensity of heat transfer.

The purpose of the invention is to increase efficiency by intensifying heat transfer.

The goal is achieved by those. that in a heat exchanger containing an air duct with a flat heat transfer wall connected to the collecting and distributing collectors, divided by transverse partitions into sections, connected to each other and provided with longitudinal partitions with perforated sections arranged parallel to the heat transfer wall, in accordance with the invention, the longitudinal partitions are corrugated and installed with offset corrugations in adjacent sections with the formation in each section

longitudinal air supply and air exhaust ducts, the first of which contain the said perforated sections, the second communicating with the air supply channels of the subsequent section by means of openings, additionally made in the said transverse partitions.

FIG. 1 shows a heat exchanger, longitudinal section; in fig. 2 - section aa nl

FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. A - section BB in FIG. 2

The recuperator contains an air duct 1 with a flat heat transfer wall 2 connected to a prefabricated 3 and a distributing 4 collectors. Box 1 is divided by transverse partitions 5 into sections 6. provided with longitudinal corrugated partitions 7 with perforated sections 8. placed in parallel

heat transfer wall 2. Longitudinal partitions 7 are installed with offset corrugations in adjacent sections 6 with the formation and each section of longitudinal air supplying 9 and air outlet 10 channels

Air passage channels 9 comprise perforated sections 8. Air outlet channels 10 are in communication with air passage channels 9 of a subsequent section through openings 11 in transverse partitions 5.

The cold air through the collecting manifold 3 is supplied to the air supply ducts 9 of the first (along the air flow) section 6 of the duct 1, and the passage through the perforated sections 8 of the corrugated longitudinal partition 7 arranged parallel to the heat transfer wall 2 flows onto the latter with a plurality of jets. Intensive heat exchange between jets occurs.

air and wall 2, then partially heated air is directed through the air exhaust ducts 10 through openings 11 in transverse partitions 5 to the air ducts 9 of the next section 6 and

then the cycle repeats. The transition from one section to another, the air repeatedly flows over the heat transfer wall 2, is heated to a high temperature and is directed through the distribution manifold 4 to the consumer.

The implementation of 6 longitudinal partitions 7 in corrugated sections allows the use of corrugated cavities as air inlet 9 and air outlet 10 channels. At the same time, the flows of unheated and heated air are separated in space and the second impact on the former is eliminated on the first, thereby ensuring perpendicular-jet heat exchange with maximum intensity in each section 6.

Installing longitudinal partitions 7 with offset corrugations in adjacent sections 6 and making openings 11 in transverse bulkheads 5 provide direct air flow to the air exhaust ducts 10 of one section into air supply ducts 9 of the subsequent section without transitions between the latter and the entire surface of the heat transfer wall 2 is used for perpendicular jet heat exchange with air.

Compared with the prototype in the proposed design of the heat exchanger, the heat exchange efficiency is increased by 28-34%. and with the same thermal power with the prototype, the proposed technical solution reduces the size of the heat exchanger by 18-22%. Accordingly, the cost of manufacturing the heat exchanger and the consumption of scarce heat-resistant materials are reduced.

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Claims (1)

Claims of Invention A heat exchanger containing an air duct connected to the collecting and distributing collectors with a flat heat transfer wall divided by transverse partitions into sections communicating with each other and provided with longitudinal partitions with perforated sections arranged parallel to the heat transfer wall, characterized in that, in order to increase efficiency, heat transfer intensification, longitudinal partitions, and partitions are made corrugated and installed with displacement of the corrugations in the adjacent sections with the image the obtainable each section of the longitudinal air supply and offtake boiling boiling channel, the first of which contains the said perforated sections, and the second conductive communication with air supply channels subsequent sections by openings, further performed in said transverse partitions. ten fcg2 teJ 6-6 anzsft A ten Schi g% J 8 I