A staggered plate heat exchanger for gas-liquid heat exchange

Abstract

This utility model relates to the field of heat exchanger technology, and more particularly to a staggered plate heat exchanger for gas-liquid heat exchange, comprising a heat exchanger connected to several sets of corrugated heat exchange plates. Adjacent corrugated heat exchange plates are connected by U-shaped tubes. Each corrugated heat exchange plate is composed of several 150-250mm corrugated heat exchange sub-plates. Inlet and outlet pipes are respectively provided on both sides of the heat exchanger. The periodically segmented corrugated heat exchange sub-plates suppress the thickening of the flow boundary layer, thereby enhancing the heat transfer process. A certain spatial distance is maintained between adjacent corrugated heat exchange plates, facilitating the mixing of flue gas at these points and regenerating the temperature gradient when entering the next heat exchange channel. The serrated arrangement of the corrugated heat exchange sub-plates generates enhanced heat transfer characteristics at each cutting point, resulting in a peak heat transfer coefficient at each cutting point. The overall average heat transfer coefficient is significantly improved compared to ordinary corrugated plates.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and more particularly to a staggered plate heat exchanger for gas-liquid heat exchange. Background Technology

[0002] Currently, heat recovery from industrial combustion flue gas presents challenges. The exhaust gases from industrial combustion furnaces, such as smelting furnaces, glass kilns, and calcining furnaces, often contain metal particles and dust smaller than 10 μm. For such waste heat recovery technologies, heat pipe heat exchangers, tube-fin heat exchangers, or plate heat exchangers with wide air-side flow channels are often used to exchange heat with the heat transfer medium water, which is then reused.

[0003] The above-mentioned recycling technologies have the following problems: 1. For both heat pipe heat exchangers and tube-fin heat exchangers, the cylindrical shape of the heat exchange tubes significantly obstructs the airflow, resulting in significant ash accumulation at the stagnation point in front of the heat exchange tubes and at the vortex separation point around 140°. Furthermore, due to the complex composition of industrial flue gas, it may even clump together, easily generating significant fouling thermal resistance; 2. For conventional blown corrugated plate heat exchangers, although the possibility of ash accumulation is low due to the relatively flat flow channel, the heat transfer performance is weak. After the boundary layer develops to a stable stage, the heat transfer between the mainstream fluid and the wall is weak. Under the allowable design pressure drop, the heat transfer coefficient is only 20~40W / m2.K, which is only on par with or slightly higher than that of flat plate heat exchangers.

[0004] Therefore, this application proposes a staggered plate heat exchanger for gas-liquid heat exchange. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a staggered plate heat exchanger for gas-liquid heat exchange.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A staggered plate heat exchanger for gas-liquid heat exchange includes a heat exchanger connected to a heat exchange mechanism.

[0007] Preferably, the heat exchange mechanism includes a corrugated heat exchange plate, which is composed of several corrugated heat exchange sub-plates.

[0008] Preferably, adjacent corrugated heat exchange subplates and corrugated heat exchange plates are connected by U-shaped tubes.

[0009] Preferably, the heat exchanger is provided with an inlet pipe and an outlet pipe on both sides.

[0010] Preferably, the corrugated heat exchange subplate is distributed in a sawtooth shape or periodically repeated discontinuously.

[0011] Preferably, the heat exchanger is provided with an air duct.

[0012] The beneficial effects of this utility model are as follows: 1. By using periodically segmented corrugated heat exchange subplates, the thickening of the flow boundary layer is suppressed, thereby enhancing the heat transfer process; 2. Maintaining a certain spatial distance between adjacent corrugated heat exchange plates facilitates the mixing of flue gas at this point, and a new temperature gradient is generated when the flue gas enters the next heat exchange channel; 3. The corrugated heat exchange subplate with a serrated arrangement generates enhanced heat transfer characteristics at each cut point, which is manifested by the peak value of the heat transfer coefficient at each cut point. The overall average heat transfer coefficient is significantly improved compared with ordinary corrugated plates. Attached Figure Description

[0013] Figure 1 This is an overall structural diagram of the heat exchanger in a specific embodiment of this utility model; Figure 2 This is a diagram showing the relationship between the surface heat transfer coefficient and distribution position of the staggered corrugated plate in a specific embodiment of this utility model; Figure 3 This diagram illustrates the relationship between the surface heat transfer coefficient and distribution location of a typical inline corrugated plate in a specific embodiment of this utility model.

[0014] The following are the symbols in the attached diagram: 1. Heat exchanger; 2. Corrugated heat exchange plate; 3. Inlet pipe; 4. Outlet pipe; 5. Air duct. Detailed Implementation

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0016] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. It should be noted that, unless otherwise explicitly specified and limited, terms such as "installed," "equipped with," "sleeved / connected," and "connected" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Please see Figure 1 As shown, this utility model relates to a staggered plate heat exchanger 1 for gas-liquid heat exchange, specifically including a heat exchanger 1, wherein the heat exchanger 1 is connected to several sets of corrugated heat exchange plates 2, wherein each set of corrugated heat exchange plates 2 is spaced apart by a certain distance, and adjacent corrugated heat exchange plates 2 maintain a certain spatial distance, which is conducive to the mixing of flue gas at this point, and the temperature gradient is regenerated when entering the next heat exchange channel.

[0018] Each set of corrugated heat exchange plates 2 consists of several 150~250mm corrugated heat exchange sub-plates, wherein the corrugated heat exchange sub-plates are distributed in a sawtooth shape or periodically repeated discontinuously. In some other embodiments, the size of the corrugated heat exchanger subplate may include any value.

[0019] refer to Figures 2-3 As shown in the figure, through numerical simulation results of the same working conditions of the structure of this application and the conventional corrugated plate structure, and by extracting the surface heat transfer coefficient value, it can be found that the corrugated heat exchange subplate of this application adopts a sawtooth staggered distribution. Each cutting point produces enhanced heat transfer characteristics, which is manifested as the peak value of the heat transfer coefficient generated at each cutting point. The overall average heat transfer coefficient is about 34.6% higher than that of ordinary straight-line corrugated plate.

[0020] Inlet pipe 3 and outlet pipe 4 are provided on both sides of heat exchanger 1. The heat medium water first enters from the inlet pipe 3, passes through the same group of corrugated heat exchange sub-plates along the flow direction, then enters the adjacent group of corrugated heat exchange sub-plates through the U-shaped pipe, and then flows out from the outlet pipe 4. The inner water path is connected sequentially between the corrugated heat exchange plates 2, forming a flow opposite to the flue gas (complete counter-current flow) to obtain a larger heat exchange temperature difference. The heat exchanger 1 is also provided with a duct 5 and a small heat exchange unit is provided inside the heat exchanger 1. The small heat exchange unit forms an angle of 2 to 8° with the airflow direction (flowing straight through the duct 5), and the adjacent heat exchange units are arranged in a staggered manner.

[0021] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An interlaced plate heat exchanger for gas-liquid heat exchange, characterized in that It includes a heat exchanger (1) connected to a heat exchange mechanism.

2. The gas-liquid heat exchanging interleaved plate heat exchanger according to claim 1, wherein, The heat exchange mechanism includes a corrugated heat exchange plate (2), which is composed of several corrugated heat exchange sub-plates.

3. The gas-liquid heat exchanging interleaved plate heat exchanger according to claim 2, wherein, The adjacent corrugated heat exchange subplate and corrugated heat exchange plate (2) are connected by U-shaped tubes.

4. The gas-liquid heat exchanger interleaved plate heat exchanger according to claim 1, wherein, The heat exchanger (1) is provided with an inlet pipe (3) and an outlet pipe (4) on both sides respectively.

5. The gas-liquid heat exchanger staggered plate heat exchanger according to claim 2, wherein, The corrugated heat exchange subplates are distributed in a sawtooth shape or are periodically discontinuous.

6. The gas-liquid heat exchanger staggered plate heat exchanger according to claim 1, wherein, The heat exchanger (1) is provided with an air duct (5).

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