Rotary air-to-air heat exchanger

Abstract

A rotary gas-to-gas heat exchanger relates to the field of gas processing technology, and solves the technical problem of increasing the application range of temperature difference. The heat exchanger includes a chassis, the inner cavity of which is divided into a low-temperature side air duct and a high-temperature side air duct, and a heat exchange rotor is arranged in the chassis, the heat exchange rotor is composed of a wheel axle and a heat exchange wheel core; the heat exchange wheel core extends into the low-temperature side air duct and the high-temperature side air duct respectively; the heat exchange wheel core is formed by two metal belts alternately stacked from inside to outside along the radial direction of the heat exchange wheel core, one of which is a flat belt, and the other is a corrugated belt, and the rigidity of the flat belt is lower than that of the corrugated belt, and the trough of the corrugated belt faces inward and the peak faces outward. The heat exchanger provided by the present invention is used for heat exchange between low-temperature gas and high-temperature gas.

Description

Technical Field

[0001] The invention relates to a gas processing technology, and in particular to a rotary gas-to-gas heat exchanger technology. Background Art

[0002] Gas-to-gas heat exchangers are used in situations where high-temperature gas and low-temperature gas are exchanged for heat, such as heat exchange between boiler flue gas and air, heat exchange between kiln exhaust gas and combustion-supporting air, heat exchange between oven exhaust gas and incoming air, etc.

[0003] The wheel core structure and cavity structure of the existing rotary air-to-air heat exchanger are easily deformed under the thermal deformation and thermal stress caused by large temperature difference, which may lead to seal failure at the sealing part. Therefore, the application range of the existing rotary air-to-air heat exchanger is relatively narrow, and the temperature difference between the low temperature side and the high temperature side is relatively small. In addition, when the pressure difference between the low temperature side and the high temperature side is too large, the seal between the low temperature side and the high temperature side is also easily deformed due to excessive pressure, resulting in seal failure. Summary of the invention

[0004] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a rotary air-to-air heat exchanger with a wide temperature difference application range and good sealing effect.

[0005] In order to solve the above technical problems, the present invention provides a rotary air-to-air heat exchanger, comprising a chassis, wherein the inner cavity of the chassis is divided into a left and a right air duct by an air duct seal, wherein the left air duct is a low-temperature side air duct, and the right air duct is a high-temperature side air duct, and an air inlet and an air outlet of the low-temperature side air duct are provided on the chassis, and an air inlet and an air outlet of the high-temperature side air duct are provided on the chassis;

[0006] A rotatable heat exchange wheel is provided in the chassis, and the heat exchange wheel is composed of a wheel axle and a heat exchange wheel core installed on the wheel axle; the heat exchange wheel core extends into the low-temperature side air duct and the high-temperature side air duct respectively, and the low-temperature side air duct is divided into a front and rear chamber by the heat exchange wheel core, and the high-temperature side air duct is divided into a front and rear chamber by the heat exchange wheel core, and the joint between the circumferential surface of the heat exchange wheel core and the inner wall of the chassis is sealed by a circumferential seal;

[0007] The characteristic is that the heat exchange wheel core is formed by two metal belts alternately stacked from inside to outside along the radial direction of the heat exchange wheel core, one of the metal belts is a flat belt, and the other metal belt is a corrugated belt, and the rigidity of the flat belt is lower than that of the corrugated belt, the trough of the corrugated belt faces inward and the crest faces outward, and the adjacent crests and troughs on the inner and outer sides of the flat belt are staggered.

[0008] Furthermore, the cavity wall of the chassis has three structural layers, which are, from inside to outside, an inner structural layer, a thermal insulation structural layer, and an outer structural layer, wherein the inner structural layer is a metal layer, and the inner structural layer forms a corrugated structure.

[0009] Furthermore, the air duct seal includes a sealing box and a plurality of sealing sheets. The sealing box is fixed on the chassis. A plurality of elastic spring sheets are fixed in the sealing box. Each sealing sheet is respectively fixed on each spring sheet in the sealing box. The sealing sheets are arranged at intervals from left to right, and each sealing sheet is gap-fitted with the heat exchange wheel core.

[0010] Furthermore, a back-blowing air duct is provided on the upper part of the chassis, and the back-blowing air duct is arranged between the low-temperature side air duct and the high-temperature side air duct. The heat exchange wheel core passes through the back-blowing air duct, and the air inlet of the back-blowing air duct is connected to the air inlet of the low-temperature side air duct, and the air outlet of the back-blowing air duct is connected to the air outlet of the high-temperature side air duct.

[0011] Furthermore, the chassis is provided with a water spray head for spraying cleaning material onto the heat exchange wheel core.

[0012] The rotary air-to-air heat exchanger provided by the present invention has a heat exchange wheel core made of alternately stacked flat belts with low rigidity and corrugated belts with high rigidity. Under high temperature conditions, the flat belts can disperse the thermal stress of the corrugated belts and avoid the thermal deformation of the corrugated belts, so that the heat exchange wheel core can withstand the thermal expansion and contraction caused by large temperature differences. It is not easy to deform in application scenarios where the temperature difference between the low-temperature side and the high-temperature side is large, thereby ensuring the sealing performance of the sealing part. It can be used in occasions where the temperature difference between the low-temperature side and the high-temperature side is large, and has the characteristics of a wide temperature difference application range. In addition, the inner structural layer of the chassis is formed with a corrugated structure. The existence of the corrugated structure enables the inner structural layer of the chassis to have a certain thermal deformation capacity, can withstand the thermal expansion and contraction caused by large temperature differences, and can avoid the damage of the inner structural layer due to thermal expansion and contraction. In addition, the air duct seal adopts a labyrinth-like elastic sealing structure, and the gap between each sealing sheet can play an expansion and pressure reduction role, which can avoid the deformation of the seal due to excessive pressure, thereby ensuring the sealing performance of the sealing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a right front perspective stereoscopic view of a rotary air-to-air heat exchanger according to an embodiment of the present invention;

[0014] Figure 2 is a partially cutaway right front perspective stereoscopic view of a rotary air-to-air heat exchanger according to an embodiment of the present invention;

[0015] Figure 3 is a right front perspective stereoscopic view of a heat exchange rotor and an air duct seal in a rotary air-to-air heat exchanger according to an embodiment of the present invention;

[0016] Figure 4 Schematic diagram of the structure layer of the heat exchange wheel core in the rotary air-to-air heat exchanger of an embodiment of the present invention;

[0017] Figure 5is a schematic diagram of the structural layers of a chassis in a rotary air-to-air heat exchanger according to an embodiment of the present invention;

[0018] Figure 6 The air duct seal of the rotary air-to-air heat exchanger of the embodiment of the present invention is Figure 3 The top view after cutting along the AA line. DETAILED DESCRIPTION

[0019] The following is a further detailed description of an embodiment of the present invention in conjunction with the accompanying drawings, but this embodiment is not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all represent the relationship of and.

[0020] like Figure 1-Figure 6 As shown, a rotary air-to-air heat exchanger provided in an embodiment of the present invention comprises a chassis 1, wherein the inner cavity of the chassis 1 is divided into a left and a right air duct by an air duct seal 4, wherein the left air duct is a low-temperature side air duct, and the right air duct is a high-temperature side air duct, and an air inlet and an air outlet of the low-temperature side air duct are provided on the chassis 1, and an air inlet and an air outlet of the high-temperature side air duct are provided on the chassis 1;

[0021] A rotatable heat exchange wheel is provided in the case 1, and the heat exchange wheel is composed of a wheel shaft 3 and a heat exchange wheel core 2 mounted on the wheel shaft; the heat exchange wheel core 2 extends into the low-temperature side air duct and the high-temperature side air duct respectively, and the low-temperature side air duct is divided into a front and rear chamber by the heat exchange wheel core 2, and the high-temperature side air duct is divided into a front and rear chamber by the heat exchange wheel core 2, and the joint between the circumferential surface of the heat exchange wheel core 2 and the inner wall of the case 1 is sealed by a circumferential seal 8;

[0022] The heat exchange wheel core 2 is formed by two metal belts 21 and 22 alternately stacked along the radial direction of the heat exchange wheel core from inside to outside (the side facing the wheel axle is the inside), one of the metal belts is a flat belt, and the other metal belt is a corrugated belt, and the rigidity of the flat belt 21 is lower than that of the corrugated belt 22, the trough of the corrugated belt 22 faces inward and the crest faces outward, and the crests and troughs adjacent to each other on both sides of the flat belt 21 are staggered (that is, the crests of the corrugated belt adjacent to the inside of the flat belt are staggered with the troughs of the corrugated belt adjacent to the outside);

[0023] The cavity wall of the chassis 1 has three structural layers, which are, from inside to outside, an inner structural layer 13 , a heat-insulating structural layer 12 , and an outer structural layer 11 , wherein the inner structural layer 13 is a metal layer and is formed with a corrugated structure 131 .

[0024] In the embodiment of the present invention, the air duct seal 4 includes a sealing box 5 and a plurality of sealing sheets 7. The sealing box 5 is fixed on the chassis 1. A plurality of elastic spring sheets 6 are fixed in the sealing box 5. Each sealing sheet 7 is respectively fixed on each spring sheet 6 in the sealing box, and each sealing sheet 7 is arranged at intervals from left to right, and each sealing sheet 7 is clearance-matched with the heat exchange wheel core 2.

[0025] In an embodiment of the present invention, a back-blowing air duct is provided on the upper part of the chassis, and the back-blowing air duct is arranged between the low-temperature side air duct and the high-temperature side air duct. The heat exchange wheel core passes through the back-blowing air duct, and the air inlet of the back-blowing air duct is connected with the air inlet of the low-temperature side air duct, and the air outlet of the back-blowing air duct is connected with the air outlet of the high-temperature side air duct; when the heat exchange wheel core is transferred from the dirty air flow side (generally high-temperature gas) to the clean air flow side (generally low-temperature gas), the clean air flow can be blown toward the heat exchange wheel core through the back-blowing air duct to remove dirt on the heat exchange wheel core.

[0026] In an embodiment of the present invention, a water spray head for spraying cleaning material onto the heat exchange wheel core is provided on the chassis. If the heat exchange airflow carries substances that are easy to be blocked, the water spray head can be used to spray high-pressure water flow, water vapor or compressed air and other working fluids onto the heat exchange wheel core to flush the heat exchange wheel core.

[0027] The embodiment of the present invention can realize gas-to-gas heat exchange in the case where the temperature difference between the low temperature side and the high temperature side is large, and its working mode is as follows:

[0028] The heat exchange wheel core rotates slowly and continuously, and each part of the heat exchange wheel core reciprocates from the high-temperature side air duct to the low-temperature side air duct, and then from the low-temperature side air duct to the high-temperature side air duct;

[0029] When the high-temperature airflow flows through the high-temperature side air duct, it transfers the heat to the heat exchange wheel core. As the heat exchange wheel core continues to rotate, the heat is brought into the low-temperature side air duct. When the low-temperature airflow flows through the low-temperature side air duct, it absorbs the heat brought from the high-temperature side air duct by the heat exchange wheel core, thereby realizing heat exchange between the high-temperature side and the low-temperature side.

[0030] When the heat exchange wheel core is on the high-temperature side, since the stiffness of the flat belt is lower than that of the corrugated belt, when the flat belt is subjected to the top pressure of the thermal deformation of the corrugated belt, it will deform at the peak and valley positions of the corrugated belt, which can disperse and avoid the thermal deformation and thermal stress of the corrugated belt and the flat belt, and avoid the overall deformation of the heat exchange wheel core, thereby ensuring the sealing performance of the sealing part.

[0031] The corrugated structure of the inner structural layer of the chassis enables the inner structural layer of the chassis to have a certain thermal deformation capacity, can withstand thermal expansion and contraction caused by large temperature differences, and can avoid damage to the inner structural layer due to thermal expansion and contraction.

[0032] When there is a pressure difference between the low-temperature side air duct and the high-temperature side air duct, the airflow on the high-pressure side will leak slightly through the gap between the sealing plate and the heat exchange wheel core. Since the sealing plate is installed on the sealing box through the spring plate, the gap between the sealing plate and the heat exchange wheel core will be elastically adjusted with the size of the airflow pressure. The gap between each sealing plate can play a role of expansion and pressure reduction, which can prevent the seal from being deformed due to excessive pressure, thereby ensuring the sealing performance of the sealing part.

Claims

1. A rotary air-to-air heat exchanger, comprising a chassis, wherein the inner cavity of the chassis is divided into a left and a right air duct by an air duct seal, wherein the left air duct is a low-temperature side air duct, and the right air duct is a high-temperature side air duct, an air inlet and an air outlet of the low-temperature side air duct are provided on the chassis, and an air inlet and an air outlet of the high-temperature side air duct are provided on the chassis; A rotatable heat exchange wheel is provided in the chassis, and the heat exchange wheel is composed of a wheel axle and a heat exchange wheel core installed on the wheel axle; the heat exchange wheel core extends into the low-temperature side air duct and the high-temperature side air duct respectively, and the low-temperature side air duct is divided into a front and rear chamber by the heat exchange wheel core, and the high-temperature side air duct is divided into a front and rear chamber by the heat exchange wheel core, and the joint between the circumferential surface of the heat exchange wheel core and the inner wall of the chassis is sealed by a circumferential seal; Features: The air duct seal comprises a sealing box and a plurality of sealing sheets. The sealing box is fixed on the chassis. A plurality of elastic spring sheets are fixed in the sealing box. Each sealing sheet is respectively fixed on each spring sheet in the sealing box. Each sealing sheet is arranged at intervals from left to right, and each sealing sheet is clearance-matched with the heat exchange wheel core. The heat exchange wheel core is formed by two metal belts alternately stacked from inside to outside along the radial direction of the heat exchange wheel core, one of the metal belts is a flat belt, and the other metal belt is a corrugated belt, and the rigidity of the flat belt is lower than that of the corrugated belt, and the trough of the corrugated belt faces inward and the peak faces outward.

2. The rotary gas-to-gas heat exchanger according to claim 1, characterized in that: The cavity wall of the chassis has three structural layers, which are respectively an inner structural layer, a heat-insulating structural layer and an outer structural layer from the inside to the outside. The inner structural layer is a metal layer, and the inner structural layer is formed with a corrugated structure.

3. The rotary gas-to-gas heat exchanger according to claim 1, characterized in that: A back-blowing air duct is provided on the upper part of the chassis, and the back-blowing air duct is arranged between the low-temperature side air duct and the high-temperature side air duct. The heat exchange wheel core passes through the back-blowing air duct, and the air inlet of the back-blowing air duct is connected to the air inlet of the low-temperature side air duct, and the air outlet of the back-blowing air duct is connected to the air outlet of the high-temperature side air duct.

4. The rotary gas-to-gas heat exchanger according to claim 1, characterized in that: The chassis is provided with a water spray head for spraying cleaning material onto the heat exchange wheel core.

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