CN110230935B

CN110230935B - Strong heat adaptability plate-fin heat exchanger core body with flexible structure

Info

Publication number: CN110230935B
Application number: CN201910506120.1A
Authority: CN
Inventors: 凌祥; 黄钰喆; 杜明胜; 杨思晟
Original assignee: Nanjing Tech University
Current assignee: Nanjing Tech University
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2021-05-04
Anticipated expiration: 2039-06-12
Also published as: CN110230935A

Abstract

The invention discloses a strong heat adaptability plate-fin heat exchanger core body with a flexible structure, which comprises a cover plate, sealing strips, expansion-contraction type partition plates and expansion-contraction type fins, wherein a groove is formed in the middle position of the cover plate, a plurality of layers of the expansion-contraction type partition plates and a plurality of layers of the expansion-contraction type fins are alternately stacked and arranged, the expansion-contraction type partition plates are clamped and brazed by the cover plate, a hot channel is formed by clamping a layer of expansion-contraction type fin on two layers of the expansion-contraction type partition plates and is sealed by the sealing strips, a cold channel is formed by clamping a layer of expansion-contraction type fin on two layers of the expansion-contraction type partition plates which are arranged in a reverse direction with the hot channel and is sealed by the sealing strips, and grooves. The utility model provides a strong adaptability plate-fin heat exchanger core of flexible construction, can be used to the heat transfer occasion of special operating mode such as the heat transfer difference in temperature is big, fluid temperature alternation, discontinuous heat transfer, and application temperature range is wide, and double-arch apron and two omega shape strip of paper used for sealing structures can improve equipment heat adaptability by a wide margin, reduce destruction risks such as fatigue damage, extension equipment life.

Description

Strong heat adaptability plate-fin heat exchanger core body with flexible structure

Technical Field

The invention relates to the field of heat exchangers, in particular to a high-heat-adaptability plate-fin heat exchanger core body with a flexible structure.

Background

The plate-fin heat exchanger has the characteristics of compact structure, high heat transfer efficiency, strong working medium adaptability and the like, and is widely applied to different fields of petrochemical industry, aerovehicles, power machinery, air separation deep cooling, atomic energy and the like recently. Along with the continuous improvement of production technology level, heat exchange working conditions tend to be complex, heat exchange occasions with special working conditions such as high-low temperature large-temperature difference heat exchange, variable temperature heat exchange with alternate fluid temperature change, discontinuous heat exchange and the like appear in more and more production processes, the heat exchanger works in a cold and hot alternate working environment for a long time, the difference of structural deformation of the plate-fin heat exchanger can be caused by temperature difference, so that thermal stress is generated, the heat exchanger can be fatigue-failed due to periodic change of the thermal stress, and the industrial production efficiency and the personnel safety are seriously affected.

In the structure of the existing plate-fin heat exchanger, the thermal strain of different degrees can be generated by the fluid temperature difference at the two sides of the partition plate and the cover plate, the possibility of generating structural thermal fatigue damage is greatly increased under special working conditions such as large temperature difference heat exchange, alternate temperature change heat exchange, discontinuous heat exchange and the like, once local fracture damage is generated, adverse conditions such as heat exchange working medium mixing, leakage and the like can be caused, even toxic and harmful substance leakage, explosion and other accidents can be caused in serious conditions, great influence is brought to the production process and the regional safety, and the heat adaptability of the plate-fin heat exchanger is strengthened, so that the heat exchanger has important significance. The METHOD comprises the following steps OF optimizing the DESIGN calculation METHOD OF a multi-surrounding PLATE-FIN HEAT EXCHANGER, optimizing the layout OF flow channels, optimizing the structure DESIGN OF components and the like in the existing patents at home and abroad, such as a recently disclosed patent CN106503390A CREEP FATIGUE STRENGTH DESIGN METHOD OF the PLATE-FIN HEAT EXCHANGER, a CN106338431B mechanical parameter calculation METHOD and an application DESIGN METHOD thereof, WO 2018/086411A 1DESIGN METHOD FOR CREAP FATIGUE STRENGTH OF PLATE-FIN HEAT EXCHANGER, and optimizing the structure DESIGN OF the PLATE-FIN HEAT EXCHANGER from the perspective OF a theoretical METHOD; the CN104990433B plate-fin heat exchanger and the CN108489307A plate-fin heat exchanger provide an optimized design scheme in the aspect of the arrangement of a flow channel of the plate-fin heat exchanger, combine the heat exchange process and the gas-liquid separation process, and improve the production efficiency of equipment; CN201917246U high-temperature plate-fin radiator core, CN205209323U an aluminum alloy plate-fin heat exchanger structure adopting a high-temperature resistant special-shaped seal, and CN205843467U special-shaped seal, and provides a novel design structure of local components such as a plate-fin heat exchanger seal, and the like, thereby improving the fatigue resistance of equipment and prolonging the service life. Above patent all made optimization and innovation on traditional plate-fin heat exchanger's design basis, promoted equipment efficiency to a certain extent, these optimize and have compared and have had great progress in the past, nevertheless to the special heat transfer occasion that exists in the actual production process, have certain limitation in the application, plate-fin heat exchanger design technique still has very big optimization space.

Disclosure of Invention

The invention provides a strong heat adaptability plate-fin heat exchanger core body with a flexible structure, which meets the special heat exchange requirements of large-temperature-difference heat exchange, fluid alternating temperature change, discontinuous heat exchange and the like in industry, improves the anti-fatigue property of equipment while efficiently exchanging heat, and prolongs the service life of the equipment.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a strong heat adaptability plate-fin heat exchanger core of flexible construction, includes apron, strip of paper used for sealing, the formula baffle that contracts of expanding, the formula fin that contracts, apron intermediate position department fluting, a plurality of layers expand the formula baffle and a plurality of layers expand the formula fin and fold in turn and arrange, press from both sides the dress brazing connection by the apron, hot passageway presss from both sides the dress one deck formula fin that contracts for two-layer formula baffle that contracts and is sealed by the strip of paper used for sealing, and cold passageway presss from both sides the dress one deck formula fin and is sealed by the strip of paper used for sealing for the formula baffle that contracts that expands that two-layer and hot passageway reverse arranged, the internal cold and hot passageway both ends strip of paper used for sealing passageway side fluti.

It is further characterized in that: the middle position of the cover plate is provided with a groove, and the section of the groove is double-arch or internally rectangular or double-omega-shaped.

The side of the seal channel is provided with a groove, and the section of the groove is double-omega-shaped or double-arch-shaped and internally rectangular.

And a groove is formed in the middle of the cover plate, the thickness of the thinnest part of the groove is limited by half of the thickness of the cover plate, and the length of the groove is equal to the length of the side edge of the cover plate.

The side of the seal channel is provided with a groove, and the maximum groove width dimension is limited by half of the height of the expanding type fin of the channel.

The cold and hot fluid channels in the core body of the plate-fin heat exchanger are arranged in a counter-flow mode, the fluid layers can be arranged in a single-overlapped mode or a multi-overlapped mode, expansion and contraction type partition plates are arranged between cold and hot fluids, and the middle partition plates of adjacent channels of the same fluid are common flat plate type partition plates when the cold and hot fluids are arranged in the multi-overlapped mode.

The expansion-contraction type fins are arranged in each flow layer of the plate-fin heat exchanger core, the tooth height is determined by the distance between the partition plates of the layer, and the heat transfer is enhanced by changing the cross section of the flow channel.

Disturbance enhancement belts can be additionally arranged on the fluid sides of the expansion-contraction type fins.

And fluid with smaller temperature difference with the ambient temperature is arranged in outermost channels on two sides of the core body of the plate-fin heat exchanger.

The expansion-contraction type fins are straight fins or zigzag, triangular and porous fins.

The invention has the beneficial effects that:

the plate-fin heat exchanger core body is provided with the double-arch grooves in the middle of the cover plate, and the double-omega-shaped grooves are arranged on the sides of the seal strip channels at the two ends of the cold and hot channels, so that the influence of thermal stress action can be reduced to a certain extent by better structural adaptability when large temperature difference heat exchange strain is generated, and the risk of equipment damage is reduced.

On the other hand, the expansion-contraction type partition plates are arranged between cold fluid and hot fluid, the height of each channel fin changes along with the distance between the expansion-contraction type partition plates, the heat transfer enhancement in the flowing process can be realized by reducing the flowing section, increasing the flow velocity of the fluid and enhancing the disturbance effect, and the slope type structure of the expansion-contraction type partition plates can improve the heat adaptability of the equipment.

Drawings

Fig. 1 is a schematic structural diagram of a plate-fin heat exchanger core according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a double-arched cover plate of a plate-fin heat exchanger according to an embodiment of the invention.

Fig. 3 is a schematic view of an expansion-contraction type partition plate of a plate-fin heat exchanger according to an embodiment of the invention.

Fig. 4 is a schematic view of a double- Ω -shaped seal of a plate-fin heat exchanger according to an embodiment of the present invention.

Fig. 5 is a schematic view of an expanding fin of a plate-fin heat exchanger according to an embodiment of the present invention.

In the figure, 1 is a double-arch cover plate, 2 is an expansion-contraction type fin, 3 is a double-omega-shaped seal, 4 is a seal head, 5 is an expansion-contraction type clapboard, and 6 is a disturbance reinforcing belt.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, and the following examples are illustrative of the present invention and are not limited to the following examples.

The plate-fin heat exchanger of the embodiment is a counter-flow aluminum plate-fin heat exchanger based on a flexible structure and a strong heat adaptability plate-fin heat exchanger core, and as shown in fig. 1, the plate-fin heat exchanger core of the embodiment of the invention is schematically shown in structure. The heat exchanger core body is formed by alternately stacking and arranging a plurality of layers of expansion-contraction type partition plates 5 and a plurality of layers of expansion-contraction type fins 2 and clamping and brazing the expansion-contraction type fins by double-arch cover plates 1, a hot channel is formed by clamping a layer of expansion-contraction type fins 2 on two layers of expansion-contraction type partition plates 5 and sealing the expansion-contraction type fins 2 by double-omega-shaped sealing strips 3, and a cold channel is formed by clamping a layer of expansion-contraction type fins 2 on two layers of expansion-contraction type partition plates 5 which are arranged in a reverse direction with the hot channel and sealing the double-omega-shaped sealing strips 3; cold fluid with smaller temperature difference with the environment is arranged in outermost channels on two sides of the plate-fin heat exchanger core; and disturbance enhancing belts 6 are additionally arranged on the fluid sides of the expansion-contraction type fins 2 in the channels of each layer. Cold and hot fluids are input into the plate-fin heat exchanger through the end socket 4 in a countercurrent heat exchange mode, then are guided to corresponding channels in the core body, are separated by the expansion-contraction type partition plates 5 and the expansion-contraction type fins 2, and realize heat exchange through heat conduction and convection heat transfer.

The double-arch groove is arranged in the middle of the cover plate of the plate-fin heat exchanger, the plate thickness at the thinnest position of the groove is half of the thickness of the cover plate, the length of the groove is equal to the side length of the cover plate, and the groove position is the middle point of a connecting line at the corresponding position of the center line of the same-side fluid inlet/outlet connecting pipe.

The sides of the seal channels at the two ends of the fluid channel of the plate-fin heat exchanger are provided with grooves, the cross sections of the grooves are double-omega-shaped, and the maximum groove width dimension is half of the height of the channel fin.

The expansion-contraction type fin 2 in the fluid channel of the embodiment adopts a straight fin, and other embodiments can select a zigzag shape, a triangular shape or a porous shape, and the like, and the embodiments are not separately described. Fig. 5 is a schematic view of the expansion and contraction type fins of the plate-fin heat exchanger according to the embodiment of the present invention, wherein disturbance enhancement bands are not disposed on fluid sides of the expansion and contraction type fins, and the heights of the expansion and contraction type fins are the same as the distances between the corresponding positions of the adjacent expansion and contraction type partition plates. In other embodiments, disturbance enhancement belts 6 can be arranged on the flow channel sides of the expanding-contracting fins, and the number and the spacing of the disturbance strips can be adjusted according to the physical parameters, components and the like of the fluid.

Fig. 2-5 are schematic diagrams of a double-arch cover plate, an expansion-contraction partition plate, a double-omega-shaped seal and an expansion-contraction fin of the plate-fin heat exchanger according to the embodiment of the invention.

After the plate-fin heat exchanger is processed, an air tightness test and a hydraulic test are required, so that the tightness and the bearing performance of the plate-fin heat exchanger are ensured to test the welding quality among parts.

The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical idea proposed by the present invention fall within the protection scope of the claims of the present invention. The technology not related to the invention can be realized by the prior art.

Claims

1. The utility model provides a strong adaptability plate-fin heat exchanger core of flexible construction which characterized in that: the heat exchanger core body is characterized by comprising a cover plate, sealing strips, expansion-contraction type partition plates and expansion-contraction type fins, wherein grooves are formed in the middle positions of the cover plate, a plurality of layers of the expansion-contraction type partition plates and a plurality of layers of the expansion-contraction type fins are alternately stacked and arranged, the cover plate clamps and is in braze welding connection, a hot channel is formed by clamping a layer of expansion-contraction type fins on two layers of the expansion-contraction type partition plates and is sealed by the sealing strips, a cold channel is formed by clamping a layer of expansion-contraction type fins on two layers of the expansion-contraction type partition plates which are arranged in a reverse direction with the hot channel and is sealed by the sealing strips, and;

a groove is formed in the middle of the cover plate, and the section of the groove is double-arched;

the side of the seal channel is provided with a groove, and the section of the groove is double-omega type; the maximum groove width dimension is limited by half of the height of the expanding type fin of the channel;

the expansion-contraction type partition plate is a partition plate with a spaced concave-convex structure, wherein the extending direction of the concave-convex structure is vertical to the flowing direction of the fluid, and the concave-convex structure penetrates through the whole partition plate;

the cold and hot fluid channels in the core body of the plate-fin heat exchanger are arranged in a counter-flow manner, the fluid layers can be arranged in a single-overlapping or overlapping manner, and expansion and contraction type partition plates are arranged between cold and hot fluids;

expanding and shrinking type fins are arranged in each flow layer of the plate-fin heat exchanger core;

cold fluid with smaller temperature difference with the environment is arranged in outermost channels on two sides of the plate-fin heat exchanger core; a disturbance enhancing belt (6) is additionally arranged at the fluid side of the expanding and contracting type fin (2) in each layer of channel; cold and hot fluid is input into the plate-fin heat exchanger through the end socket (4) in a countercurrent heat exchange mode and then is guided to corresponding channels in the core body, is separated by the expansion-contraction type partition plates (5) and the expansion-contraction type fins (2), and realizes heat exchange through heat conduction and convection heat transfer; the plate thickness of the thinnest position of the slotted position of the plate-fin heat exchanger cover plate is half of the thickness of the cover plate, the slot length is equal to the side length of the cover plate, and the slotted position is the midpoint of a connecting line of the corresponding positions of the center lines of the fluid inlet and outlet connecting pipes on the same side.

2. The flexible structural highly thermally adaptive plate fin heat exchanger core of claim 1, wherein: when the cascade arrangement is carried out, the intermediate baffle plates of the adjacent flow passages of the same fluid are common flat plate type baffle plates; the tooth height of the expansion type fins is determined by the distance between the partition plates, and the heat transfer is enhanced by changing the cross section of the flow channel.