A cyclone type gas mixing and cooling device

Abstract

The utility model relates to a kind of swirl type gas mixing cooling devices, including shell and inner shell, inner shell is arranged in shell, and the gas mixing space is formed between inner shell outer wall and shell inner wall, inner shell lower end inlet is communicated with the hot medium gas inlet pipe located in the outside of shell, and hot medium gas outlet is uniformly arranged on the side wall of inner shell, and the upper end of inner shell is closed end;Shell side wall lower portion is equipped with several cold medium gas inlet pipe, and it is arranged along circumference interval, so that the cold medium airflow introduced forms clockwise or counterclockwise swirl along circumference, and swirl is used to wrap the side wall of inner shell and mix with the hot medium airflow output from hot medium gas outlet in gas mixing space;The shell bottom end is equipped with the accommodation hole for the accommodation of the connecting structure of the lower end inlet of the inner shell and the hot medium gas inlet pipe;Shell top end outlet is connected with mixed gas output pipe, for outputting the gas after mixing gas.The utility model improves heat exchange efficiency and the uniformity of gas mixing flow field, reduces the requirement for the performance of device shell material.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology in thermal processes, and in particular to a swirling gas mixing cooling device. Background Technology

[0002] Thermal processes involve multiple fluid flows and heat transfer stages. For example, in a rice husk gasification system, the high-temperature flue gas output from the gasifier, after preliminary dust removal and combustion, needs to pass through a heat exchanger to lower its temperature and meet the denitrification process requirements. In this heat exchange process, shell-and-tube heat exchangers are typically used, with cold air as the cooling medium. Due to the large temperature difference between the heat exchange ends, multi-stage heat exchangers are required. A large number of heat exchange stages not only results in low heat exchange efficiency but also significantly increases the risk of ash blockage, leading to poor system safety and high costs. However, for heat exchange with the same medium or where consistency of the medium before and after heat exchange is not required, a gas mixing device can be used. Its advantage is that the two heat exchange fluids are in direct contact, eliminating indirect thermal resistance, and the heat transfer coefficient is significantly higher than that of a shell-and-tube heat exchanger. However, existing gas mixing devices, due to limitations in their internal structural design, are prone to localized overheating or undercooling, resulting in poor flow field uniformity and ineffective mixing. At the same time, the equipment has high material requirements and cannot withstand high pressure or high temperature conditions (200℃ or 10MPa), which limits its application in chemical, power and other fields. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a swirling gas mixing and cooling device, which solves the technical problem that existing gas mixing equipment is prone to local overheating or overcooling, resulting in poor flow field uniformity and ineffective gas mixing.

[0004] The technical solution adopted in this utility model is as follows: A swirling gas mixing cooling device includes an outer shell and an inner shell. The inner shell is disposed in the outer shell. A gas mixing space is formed between the outer wall of the inner shell and the inner wall of the outer shell. The lower end inlet of the inner shell is connected to a hot medium inlet pipe located outside the outer shell. Hot medium outlets are uniformly arranged on the side wall of the inner shell. The upper end of the inner shell is a closed end. The lower part of the outer casing sidewall is provided with several cold medium inlet pipes. The inlet of the cold medium inlet pipe is connected to the cold medium source, and the outlet of the cold medium inlet pipe is connected to the mounting hole on the outer casing sidewall. The plurality of cold medium inlet pipes are arranged circumferentially at intervals, and the axial directions of two adjacent cold medium inlet pipes intersect sequentially, so that the cold medium airflow introduced by the plurality of cold medium inlet pipes forms a clockwise or counterclockwise swirling flow along the circumference. The swirling flow is used to wrap around the inner shell sidewall and mix with the hot medium airflow output from the hot medium outlet in the mixing space. The bottom of the outer shell is provided with a clearance hole to make way for the connection structure between the lower end inlet of the inner shell and the heat medium inlet pipe; the top outlet of the outer shell is connected to the mixed gas output pipe for outputting the mixed gas.

[0005] As a preferred technical solution: The axial direction of each cold medium inlet pipe is tangent to the outer wall of the inner shell.

[0006] Several cold medium inlet pipes are evenly distributed along the circumference.

[0007] The outer shell is made of carbon steel; the inner shell is made of stainless steel.

[0008] The cold medium inlet pipe is provided with three or five pipes along the circumference.

[0009] The temperature of the heat medium is 800℃~900℃, and the temperature of the cold medium is 10℃~30℃.

[0010] The heat medium is flue gas, and the cold medium is air; or both the heat medium and the cold medium are flue gas.

[0011] The heat medium outlet is a through hole opened on the inner shell, or a flared opening installed on the through hole and communicating with it; The heat medium outlet is uniformly arranged in multiple layers along the height direction of the outer shell, and the heat medium outlet of each layer is uniformly distributed circumferentially.

[0012] The height difference between the closed end and the top of the outer shell is 1 / 3 to 1 / 2 of the height of the outer shell.

[0013] Both the outer shell and the inner shell have circular cross-sections; The inner shell and the outer shell are coaxially arranged.

[0014] The technical solution of this utility model can achieve at least some of the following beneficial effects: This invention utilizes several cold medium inlet pipes to introduce cold medium into the outer shell, forming a swirling flow. Conversely, hot medium inlet pipes introduce hot medium into the inner shell, which is then discharged through a hot medium outlet into the mixing space between the inner and outer shells to mix with the cold medium. Under the swirling effect of the cold medium, the two media undergo rapid heat exchange and thorough mixing. The hot medium is rapidly and thoroughly cooled, while the cold medium is rapidly and thoroughly heated, thus quickly obtaining a mixed gas at a suitable temperature. The swirling flow field improves the uniformity of the mixing, effectively preventing localized overcooling or overheating. Furthermore, by introducing the high-temperature hot medium into the inner shell, the outer shell does not directly contact the high-temperature medium, significantly reducing the requirements for the shell material's performance. Therefore, ordinary steel such as carbon steel can be used, greatly reducing material costs.

[0015] Because the heat transfer medium does not directly contact the outer shell, the requirements for the outer shell material performance are reduced. Only the inner shell needs to be made of a high-temperature resistant material to meet the heat exchange needs of cold and hot media over a wide temperature range, making it widely applicable in fields such as chemical engineering and power generation.

[0016] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the device according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of section AA.

[0019] Figure 3 To distinguish from Figure 2 Another arrangement of the cold medium inlet pipe is shown.

[0020] Explanation of reference numerals in the attached diagram: 1. Mixed gas output pipe; 2. Outer shell; 3. Inner shell; 4. Hot medium outlet; 5. Cold medium inlet pipe; 6. Hot medium inlet pipe; 31. Closed end. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] See Figures 1 to 3 The swirling mixed gas cooling device of this embodiment includes an outer shell 2 and an inner shell 3. The inner shell 3 is disposed in the outer shell 2. A mixed gas space is formed between the outer wall of the inner shell 3 and the inner wall of the outer shell 2. The lower end inlet of the inner shell 3 is connected to the hot medium inlet pipe 6 located outside the outer shell 2. Hot medium outlets 4 are uniformly arranged on the side wall of the inner shell 3. The upper end of the inner shell 3 is a closed end 31. Several cold medium inlet pipes 5 are provided on the lower side wall of the outer casing 2. The inlet of the cold medium inlet pipe 5 is connected to the cold medium source, and the outlet of the cold medium inlet pipe 5 is connected to the mounting hole on the side wall of the outer casing 2. Several cold medium inlet pipes 5 are arranged circumferentially, and the axial directions of two adjacent cold medium inlet pipes 5 intersect in sequence, so that the cold medium airflow introduced by several cold medium inlet pipes 5 forms a clockwise or counterclockwise swirling flow along the circumference. The swirling flow is used to wrap around the side wall of the inner shell 3 and mix with the hot medium airflow output from the hot medium outlet 4 in the mixing space. The bottom of the outer shell 2 is provided with a clearance hole to make way for the connection structure between the lower end inlet of the inner shell 3 and the hot medium inlet pipe 6; the top outlet of the outer shell 2 is connected to the mixed gas output pipe 1 for outputting the mixed gas.

[0023] Specifically, Figure 1This is a perspective view. The dotted lines in the figure represent the inner shell 3 structure that is covered by the outer shell 2.

[0024] Specifically, the flow direction of the cold medium entering each cold medium inlet pipe 5 is shown in the following figure. Figure 2 As shown by the dashed lines in .3, the flow directions of each cold medium airflow (axial direction of each cold medium inlet pipe 5) are preferably sequentially tangent to the outer wall of the inner shell 3, thus forming a clockwise rotating vortex. By setting it tangentially, excessive pressure resistance can be avoided, thereby maximizing the vortex of the cold medium and the thorough mixing of the hot medium.

[0025] In this embodiment, on the one hand, several cold medium inlet pipes 5 introduce cold medium into the outer shell 2, forming a swirling flow, and on the other hand, hot medium inlet pipes 6 introduce hot medium into the inner shell 3, which is then discharged into the mixing space through the hot medium outlet 4. There, the hot medium mixes with the cold medium, and under the swirling effect of the cold medium, the two media are thoroughly mixed while undergoing rapid heat exchange. The hot medium is rapidly and thoroughly cooled, while the cold medium is rapidly and thoroughly heated, thus quickly obtaining a mixed gas with a suitable temperature. The swirling flow field improves the uniformity of the mixing and effectively prevents local overcooling or overheating. On the other hand, the use of the inner shell to introduce the high-temperature hot medium greatly reduces the material performance requirements of the outer shell. Since the outer shell does not directly contact the high-temperature medium, ordinary steel such as carbon steel can be used, significantly reducing material costs.

[0026] Using cold air and high-temperature flue gas as the cold and hot mediums, the flow direction of the medium is as follows: Figure 1 As indicated by the middle arrow.

[0027] As a preferred embodiment, several cold medium inlet pipes 5 are evenly distributed along the circumference.

[0028] As a preferred embodiment, the cold medium inlet pipe 5 is provided with three or five pipes along the circumference, arranged as follows: Figure 2 and Figure 3 As shown. The specific quantity and spacing are determined based on the overall dimensions of the device and the heat exchange requirements.

[0029] Since the heat transfer medium does not directly contact the outer shell, an inner shell made of high-temperature and high-pressure resistant material is sufficient to meet the heat exchange requirements. This embodiment is applicable to a wide range of hot and cold media. Specifically, the heat transfer medium temperature is 800℃~900℃, and the cold media temperature is 10℃~30℃. Further, the heat transfer medium can be flue gas, and the cold media can be air; or both the heat transfer medium and the cold media can be flue gas. It is understood that the temperature and type of the hot and cold media are not limited to the above methods. It is widely applicable to any scenario where heat exchange can be achieved through gas mixing.

[0030] As a preferred option, the inner shell 3 is made of stainless steel.

[0031] As a preferred embodiment, the heat medium outlet 4 is a through hole opened on the inner shell 3, or a flared opening installed on the through hole and communicating with it.

[0032] As a preferred embodiment, the heat medium outlet 4 is uniformly arranged in multiple layers along the height direction of the outer shell 2, and the heat medium outlet 4 of each layer is uniformly distributed circumferentially.

[0033] As a preferred embodiment, the height difference between the closed end 31 and the top of the outer casing 2 is 1 / 3 to 1 / 2 of the height of the outer casing 2. This ensures sufficient residence time for the mixed airflow to achieve adequate mixing.

[0034] As a preferred embodiment, both the outer shell 2 and the inner shell 3 have circular cross-sections; As a preferred embodiment, the inner shell 3 and the outer shell 2 are arranged coaxially.

[0035] As a preferred embodiment, the connection structure between the inner shell 3 and the heat medium inlet pipe 6 is provided with a sealing element on the contact surface between the inner shell 3 and the relief hole at the bottom of the outer shell 2 to ensure the airtightness of the lower part of 2.

[0036] In summary, the gas mixing device of this invention improves the uniformity of the gas flow field, prevents localized overcooling and overheating, and enhances the thermodynamic quality of the mixed gas after heat exchange. Simultaneously, it reduces the performance requirements of the outer shell material, making it suitable for heat exchange scenarios involving cold and hot media over a wider temperature range, and meeting the application needs of fields such as chemical engineering and power generation.

[0037] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A swirling gas-mixing cooling device, characterized in that, It includes an outer shell (2) and an inner shell (3). The inner shell (3) is disposed in the outer shell (2). A gas mixing space is formed between the outer wall of the inner shell (3) and the inner wall of the outer shell (2). The lower end inlet of the inner shell (3) is connected to the hot medium inlet pipe (6) located outside the outer shell (2). Hot medium outlets (4) are uniformly arranged on the side wall of the inner shell (3). The upper end of the inner shell (3) is a closed end (31). The lower side wall of the outer shell (2) is provided with several cold medium inlet pipes (5), the inlet of the cold medium inlet pipe (5) is connected to the cold medium source, and the outlet of the cold medium inlet pipe (5) is connected to the mounting hole on the side wall of the outer shell (2); The plurality of cold medium inlet pipes (5) are arranged circumferentially at intervals, and the axial directions of two adjacent cold medium inlet pipes (5) intersect in sequence, so that the cold medium airflow introduced by the plurality of cold medium inlet pipes (5) forms a clockwise or counterclockwise swirling flow along the circumference. The swirling flow is used to wrap around the side wall of the inner shell (3) and mix with the hot medium airflow output from the hot medium outlet (4) in the mixing space. The bottom of the outer shell (2) is provided with a clearance hole to make way for the connection structure between the lower end inlet of the inner shell (3) and the hot medium inlet pipe (6); the top outlet of the outer shell (2) is connected to the mixed gas output pipe (1) for outputting the mixed gas.

2. The swirling gas mixing cooling device according to claim 1, characterized in that, The axial direction of each cold medium inlet pipe (5) is tangent to the outer wall of the inner shell (3).

3. The swirling gas mixing cooling device according to claim 1 or 2, characterized in that, Several cold medium inlet pipes (5) are evenly distributed along the circumference.

4. The swirling gas mixing cooling device according to claim 1 or 2, characterized in that, The outer shell (2) is made of carbon steel; the inner shell (3) is made of stainless steel.

5. The swirling gas mixing cooling device according to claim 1 or 2, characterized in that, The cold medium inlet pipe (5) has three or five pipes along the circumference.

6. The swirling gas mixing cooling device according to claim 1, characterized in that, The temperature of the heat medium is 800℃~900℃, and the temperature of the cold medium is 10℃~30℃.

7. The swirling gas mixing cooling device according to claim 1 or 6, characterized in that, The heat medium is flue gas, and the cold medium is air; or both the heat medium and the cold medium are flue gas.

8. The swirling gas mixing cooling device according to claim 1, characterized in that, The heat medium outlet (4) is a through hole opened on the inner shell (3), or a flared mouth installed on the through hole and communicating with it; The heat medium outlet (4) is uniformly arranged in multiple layers along the height direction of the outer shell (2), and the heat medium outlet (4) of each layer is uniformly distributed in the circumferential direction.

9. The swirling gas mixing cooling device according to claim 1, characterized in that, The height difference between the closed end (31) and the top of the outer shell (2) is 1 / 3 to 1 / 2 of the height of the outer shell (2).

10. The swirling gas mixing cooling device according to claim 1, characterized in that, The outer shell (2) and the inner shell (3) both have circular cross-sections; The inner shell (3) and the outer shell (2) are coaxially arranged.

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