Gas-liquid contact type heat exchange device and method

Abstract

The invention provides a gas-liquid contact type heat exchange device and method, and belongs to the technical field of heat exchange equipment.The gas-liquid contact type heat exchange device comprises a barrel, a sleeve is arranged on the outer side of the barrel in a sleeving mode, a gas channel is formed between the sleeve and the barrel, multiple sets of static mixing elements are arranged in the barrel side by side, and the static mixing elements comprise hollow static mixing elements; the hollow static mixing element is formed by encircling a plurality of structural sheets, the interiors of the structural sheets are hollow, a plurality of air holes are formed in the surfaces of the structural sheets, and the air holes are communicated with the gas channel. Gas-liquid two-phase full contact can be achieved, the heat exchange efficiency is improved, meanwhile, the problems of uneven gas-liquid distribution and liquid entrainment are avoided, and stable operation of equipment is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchange equipment, and in particular relates to a gas-liquid contact heat exchange device and method. Background Art

[0002] Gas-liquid direct contact heat exchange technology is widely used in industrial production due to its advantages such as high heat transfer efficiency and simple structure. Existing gas-liquid direct contact heat exchange equipment mainly includes packed towers, spray towers and other types. Among them, the packed tower increases the contact area between the gas and liquid phases through the packing, but there are problems such as uneven gas-liquid distribution; the spray tower relies on liquid atomization to improve the heat transfer effect, but it is easy to have the disadvantages of droplet entrainment and high energy consumption.

[0003] At present, common gas-liquid direct contact heat exchange equipment generally has the following problems: first, the contact between the gas and liquid phases is insufficient, and the heat exchange efficiency needs to be improved; second, problems such as uneven gas-liquid distribution and liquid entrainment are prone to occur during operation, affecting the stable operation of the equipment. Summary of the invention

[0004] In view of the defects or shortcomings in the prior art, the present invention provides a gas-liquid contact heat exchange device and method, which can achieve full contact between the gas and liquid phases and improve the heat exchange efficiency, while avoiding uneven gas-liquid distribution and liquid entrainment problems, thereby ensuring stable operation of the equipment.

[0005] To achieve the above object, the present invention adopts the following technical solution: In the first aspect, an embodiment of the present invention provides a gas-liquid contact heat exchange device, comprising a cylinder, a sleeve being arranged on the outside of the cylinder, a gas channel being formed between the sleeve and the cylinder, a plurality of groups of static mixing elements being arranged side by side inside the cylinder, the static mixing elements comprising a hollow static mixing element, the hollow static mixing element being surrounded by a plurality of structural sheets, the interior of the structural sheets being hollow, and a plurality of pores being opened on the surface, the pores being connected to the gas channel.

[0006] Furthermore, a liquid inlet is arranged at one end of the cylinder, a cylinder outlet is arranged at one end of the cylinder away from the liquid inlet, and the sleeve is arranged close to the liquid inlet.

[0007] Furthermore, a gas inlet is provided at one end of the top of the sleeve close to the liquid inlet, and the axes of the gas inlet and the liquid inlet are perpendicular to each other.

[0008] Furthermore, the static mixing element also includes a solid static mixing element, a plurality of hollow static mixing elements are arranged side by side at one end close to the gas inlet, and a plurality of solid static mixing elements are arranged side by side at a side of the hollow static mixing element away from the gas inlet.

[0009] Furthermore, both the hollow static mixing element and the solid static mixing element are composed of four trapezoidal structural pieces, a set distance is set between two adjacent structural pieces, and the angle between two adjacent structural pieces is maintained at 30 degrees, and the four trapezoidal structural pieces are combined to form a truncated cone structure.

[0010] Furthermore, the four trapezoidal structural pieces of the hollow static mixing element are hollow inside, with one end close to the inner wall of the cylinder being open and the other end away from the cylinder being closed.

[0011] Furthermore, a plurality of vents are provided on the inner wall of the cylinder, and the open end of the structural sheet is fixed at the vent and is connected to the gas channel through the vent.

[0012] Furthermore, the pore density of the end of the hollow static mixing element away from the inner wall of the cylinder is greater than the pore density of the end close to the inner wall of the cylinder.

[0013] Furthermore, the latter group of static mixing elements in two adjacent groups of static mixing elements is formed in spatial position by rotating the former group of static mixing elements 45 degrees clockwise around the central axis.

[0014] In a second aspect, an embodiment of the present invention provides a gas-liquid contact heat exchange method, using a gas-liquid contact heat exchange device as described above, comprising the following steps: During use, the gas enters the sleeve from the gas inlet at the top of the sleeve, and enters the internal cavity of the hollow static mixing element through the gas channel. Driven by the pressure difference, the gas is ejected in the form of bubbles through the pores on the surface of the structural sheet. At the same time, the liquid enters the cylinder from the liquid inlet. The bubbles meet with the liquid for heat exchange. After sufficient heat exchange, the gas-liquid mixture finally flows out from the cylinder outlet.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention arranges a plurality of hollow static mixing elements side by side inside the cylinder, and a plurality of pores are provided on the outer surface of the hollow static mixing elements, which are connected with the gas channel. The gas is ejected through the pores on the surface of the hollow static mixing elements to form a large number of small and uniform bubbles. The liquid enters the cylinder horizontally from the liquid inlet and contacts with the bubbles. The gas contacts with the liquid in the form of bubbles, which significantly improves the uniformity and stability of the gas-liquid contact, and at the same time realizes the uniform distribution of the gas, ensures that the gas-liquid two-phase contact is sufficient, and effectively improves the heat exchange efficiency.

[0016] 2. The present invention arranges multiple groups of static mixing elements inside the cylinder. The static mixing elements are formed by four trapezoidal structural sheets. A set distance is set between two adjacent structural sheets, and the angle between two adjacent structural sheets is maintained at 30 degrees. At the same time, the latter group of static mixing elements in two adjacent groups of static mixing elements is formed by rotating the former group of static mixing elements 45 degrees clockwise around the central axis in space. Under the special structure of the static mixing elements, the gas-liquid two phases are strongly mixed and heat exchanged. During the flow process, the gas-liquid mixture is guided and disturbed by the hollow static mixing elements and the solid static mixing elements to form a complex turbulent flow field, which further strengthens the mass transfer and heat transfer process. The sequential arrangement of the multiple groups of static mixing elements ensures that the gas-liquid two phases have sufficient contact time, while avoiding the formation of a mixing dead zone, and avoiding the problems of uneven gas-liquid distribution and liquid entrainment. The gas-liquid mixture that has undergone sufficient heat exchange finally flows out from the cylinder outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a heat exchange device in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a hollow static mixing element in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the back structure of the hollow static mixing element in Example 1 of the present invention; Figure 4 This is a schematic diagram of the structure of a solid static mixing element in Embodiment 1 of the present invention; Among them, 1. cylinder; 2. liquid inlet; 3. cylinder outlet; 4. sleeve; 5. gas channel; 6. gas inlet; 7. hollow static mixing element; 8. solid static mixing element; 9. structural sheet; 10. pores. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Embodiment 1 A typical implementation of the present invention is as follows Figure 1 As shown, a gas-liquid contact heat exchange device includes a cylinder 1, which is a cylindrical structure and is placed horizontally. A liquid inlet 2 is provided at one end of the cylinder 1, and the liquid inlet 2 is connected to an external pipeline by a flange connection. A cylinder outlet 3 is provided at the end of the cylinder 1 away from the liquid inlet 2, and the cylinder outlet 3 is connected to an external pipeline by a flange connection.

[0020] A sleeve 4 is sleeved on the outside of the cylinder 1, and the sleeve 4 is arranged close to the liquid inlet 2. The inner wall of the sleeve 4 and the outer wall of the cylinder 1 are spaced a set distance apart to form a gas channel 5. A gas inlet 6 is arranged at one end of the top of the sleeve 4 close to the liquid inlet 2. The gas inlet 6 is connected to the external gas pipe by a flange connection. The axes of the gas inlet 6 and the liquid inlet 2 are perpendicular to each other to form an orthogonal feeding structure. The gas and liquid phases enter through their respective channels to avoid mutual interference between the gas and liquid phases at the inlet. At the same time, the gas inlet 6 is arranged on the top of the sleeve 4, and a vertical downward air intake method is adopted to improve the uniformity of gas distribution in the gas channel 5.

[0021] A plurality of static mixing elements are arranged side by side inside the cylinder 1, and the plurality of static mixing elements are evenly arranged along the axial direction of the cylinder, and a set distance is set between two adjacent static mixing elements. The number and spacing of the static mixing elements are adjusted according to actual working conditions to ensure sufficient gas-liquid contact time and avoid unnecessary pressure loss.

[0022] The static mixing elements include hollow static mixing elements 7 and solid static mixing elements 8 , wherein a plurality of hollow static mixing elements 7 are arranged side by side at one end close to the gas inlet 6 , and a plurality of solid static mixing elements 8 are arranged side by side at a side of the hollow static mixing element 7 away from the gas inlet 6 .

[0023] like Figure 2 and Figure 4 As shown, the hollow static mixing element 7 and the solid static mixing element 8 are both composed of four trapezoidal structural pieces 9. The structural pieces 9 are made of corrosion-resistant, high-strength metal materials. A set distance is set between two adjacent structural pieces 9, and the angle between two adjacent structural pieces 9 is maintained at 30 degrees. The four trapezoidal structural pieces 9 are combined to form a truncated cone structure. One end of the four trapezoidal structural pieces 9 is connected to the inner wall of the cylinder 1, and is detachably connected to the inner wall of the cylinder 1, so as to facilitate cleaning, maintenance and component replacement of the equipment.

[0024] The trapezoidal structure sheet 9 fully considers the flow characteristics and heat exchange requirements of the gas-liquid two-phase, and realizes efficient contact between the gas-liquid two-phase while ensuring the structural strength.

[0025] Furthermore, if Figure 3 As shown, the four trapezoidal structural pieces 9 of the hollow static mixing element 7 are hollow inside, with one end close to the inner wall of the cylinder 1 being open and the other end away from the cylinder 1 being closed. A plurality of vents are provided on the inner wall of the cylinder 1, and the open ends of the structural pieces 9 are fixed at the vents and are connected to the gas channel 5 through the vents. A plurality of pores 10 are evenly provided on the side walls on both sides of the structural pieces 9, and the pores 10 on the surface of the structural pieces 9 of the hollow static mixing element 7 are supported by laser drilling, mechanical drilling or metal sintering.

[0026] During the operation of the equipment, the gas first enters from the gas inlet 6 and is evenly distributed to each hollow static mixing element 7 through the gas channel 5. Since the bottom of the structural sheet 9 is closed, the gas is ejected through the pores 10 on the surface of the hollow static mixing element 7 to form a large number of small and uniform bubbles. The liquid enters the cylinder 1 horizontally from the liquid inlet 2 and comes into contact with the bubbles. The gas comes into contact with the liquid in the form of bubbles, which significantly improves the uniformity and stability of the gas-liquid contact, and at the same time achieves uniform distribution of the gas, ensuring sufficient contact between the gas-liquid two phases and effectively improving the heat exchange efficiency.

[0027] Furthermore, the diameter of the pores 10 is 10 μm-1 mm, and the density of the pores 10 at the end of the hollow static mixing element 7 away from the inner wall of the cylinder 1 is greater than the density of the pores 10 at the end close to the inner wall of the cylinder 1, so as to achieve uniform formation and distribution of bubbles, ensuring that the formation and distribution of bubbles can promote the mass transfer and heat transfer process to the greatest extent.

[0028] The latter group of static mixing elements in two adjacent groups of static mixing elements is formed in spatial position by rotating the former group of static mixing elements 45 degrees clockwise around the central axis. The central axes of the two coincide and the radial directions are consistent, that is, the structural sheets 9 on the latter group of static mixing elements differ by 45 degrees from the structural sheets 9 on the former group of static mixing elements.

[0029] Due to the special structure of the static mixing element, the gas-liquid two-phases are strongly mixed and heat exchanged. During the flow process, the gas-liquid mixture is guided and disturbed by the hollow static mixing element 7 and the solid static mixing element 8, forming a complex turbulent flow field, which further strengthens the mass transfer and heat transfer process. The sequential arrangement of multiple groups of static mixing elements ensures that the gas-liquid two-phases have sufficient contact time, while avoiding the formation of mixing dead zones, and avoiding the problems of uneven gas-liquid distribution and liquid entrainment. The gas-liquid mixture that has undergone sufficient heat exchange finally flows out from the cylinder outlet 3.

[0030] Embodiment 2 This embodiment provides a gas-liquid contact heat exchange method, using a gas-liquid contact heat exchange device as described in the first embodiment, comprising the following steps: During use, the gas enters the sleeve from the gas inlet at the top of the sleeve, and enters the internal cavity of the hollow static mixing element through the gas channel. Driven by the pressure difference, the gas is ejected in the form of bubbles through the pores on the surface of the structural sheet. At the same time, the liquid enters the cylinder from the liquid inlet. When the bubbles meet the liquid, under the action of multiple groups of static mixing elements, the gas and liquid phases are strongly disturbed and mixed, which greatly enhances the mass transfer and heat transfer effects. The static mixing element composed of multiple structural sheets produces a complex flow field structure under its special spatial layout, which promotes the full mixing of the gas and liquid phases. The gas-liquid mixture after sufficient heat exchange finally flows out from the cylinder outlet.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas-liquid contact heat exchange device, characterized in that: It includes a cylinder, a sleeve is arranged on the outside of the cylinder, a gas channel is formed between the sleeve and the cylinder, a plurality of groups of static mixing elements are arranged side by side inside the cylinder, the static mixing elements include hollow static mixing elements, the hollow static mixing elements are surrounded by a plurality of structural sheets, the structure sheets are hollow inside, and a plurality of pores are opened on the surface, and the pores are connected with the gas channel.

2. A gas-liquid contact heat exchange device according to claim 1, characterized in that: A liquid inlet is arranged at one end of the cylinder, a cylinder outlet is arranged at one end of the cylinder away from the liquid inlet, and the sleeve is arranged close to the liquid inlet.

3. A gas-liquid contact heat exchange device according to claim 2, characterized in that: A gas inlet is arranged at one end of the top of the sleeve close to the liquid inlet, and the axes of the gas inlet and the liquid inlet are perpendicular to each other.

4. A gas-liquid contact heat exchange device according to claim 1, characterized in that: The static mixing element also includes a solid static mixing element, a plurality of hollow static mixing elements are arranged side by side at one end close to the gas inlet, and a plurality of solid static mixing elements are arranged side by side at a side of the hollow static mixing element away from the gas inlet.

5. A gas-liquid contact heat exchange device according to claim 4, characterized in that: Both the hollow static mixing element and the solid static mixing element are composed of four trapezoidal structural pieces. A set distance is set between two adjacent structural pieces, and the angle between two adjacent structural pieces is maintained at 30 degrees. The four trapezoidal structural pieces are combined to form a truncated cone structure.

6. The gas-liquid contact heat exchange device according to claim 1, characterized in that: The four trapezoidal structural pieces of the hollow static mixing element are hollow inside, with one end close to the inner wall of the cylinder being open and the other end away from the cylinder being closed.

7. A gas-liquid contact heat exchange device according to claim 6, characterized in that: A plurality of vents are provided on the inner wall of the cylinder, and the open end of the structural sheet is fixed at the vent and is connected with the gas channel through the vent.

8. The gas-liquid contact heat exchange device according to claim 1, characterized in that: The pore density at one end of the hollow static mixing element away from the inner wall of the cylinder is greater than the pore density at one end close to the inner wall of the cylinder.

9. The gas-liquid contact heat exchange device according to claim 1, characterized in that: The latter group of static mixing elements in two adjacent groups of static mixing elements is formed in spatial position by rotating the former group of static mixing elements 45 degrees clockwise around the central axis.

10. A gas-liquid contact heat exchange method, using a gas-liquid contact heat exchange device according to any one of claims 1 to 9, characterized in that: The following steps are involved: During use, the gas enters the sleeve from the gas inlet at the top of the sleeve, and enters the internal cavity of the hollow static mixing element through the gas channel. Driven by the pressure difference, the gas is ejected in the form of bubbles through the pores on the surface of the structural sheet. At the same time, the liquid enters the cylinder from the liquid inlet. The bubbles meet with the liquid for heat exchange. After sufficient heat exchange, the gas-liquid mixture finally flows out from the cylinder outlet.

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